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  Project Case Study Engineering Review: Full Tower Internals for a Ø15.8m FGD Absorber Figure 1: Field-erected FGD absorber at a carbon black production facility. 1. Project Background This case study reviews an environmental upgrade for a major carbon black producer in the Qipanjing Industrial Park, Inner Mongolia. The project involved the retrofit and hardware supply for a wet flue gas desulfurization (FGD) system treating high-volume exhaust from production lines. The centerpiece is a massive absorption tower with an internal diameter of approximately 15.8 meters, utilizing a bottom-inlet configuration. 2. Technical Challenges Gas Distribution in Bottom-Inlet Configuration With a bottom-inlet design, high-velocity flue gas enters the tower and must be evenly distributed across the entire cross-section (~196 m²) before contacting the slurry. Without proper flow management, wall abrasion and gas short-circuiting occur. Structural Load Management The scale requires robust support structures for the spray headers and demister modules. These components must withstand static loads (weight) and dynamic loads (slurry flow/pressure differentials). 3. FXSINO Scope: Complete Internal Hardware Package For this project, FXSINO acted as the turnkey supplier for all internal static hardware. Our scope covered: Gas Inlet Deflector & Flow Baffles: Custom-engineered turning vanes at the base to ensure uniform gas distribution and protect the tower walls. Spray Header Support Beams: Heavy-duty structural steelwork designed to support the weight and thrust of the large-diameter slurry pipes. Nozzle Supply & Configuration: Providing high-efficiency nozzles optimized for the specific liquid-to-gas ratio. Demister Modules & Carrier Beams: Supply of multi-stage mist eliminators and the underlying support grid system. Internal Platforms & Ladders: Access platforms within the tower for maintenance of nozzles and demisters. 4. On-Site Execution & Verification During the installation phase, FXSINO technical personnel were present to oversee critical alignment stages. Key verification points included: Levelness and plumbness of the spray header support beams. Alignment of the gas inlet deflector relative to the tower centerline. Elevation accuracy of the demister support beams to ensure proper sealing. 5. Conclusion This project demonstrates the capability to engineer and supply complete internal hardware packages for mega-scale FGD absorbers. By focusing on structural integrity and precise gas-liquid contact dynamics, FXSINO provided a reliable solution tailored to the demanding environment of the carbon black industry. © 2026 Jiangxi FXSINO Mass Transfer Technology Co., Ltd. All Rights Reserved.

SS Home > Case Studies > Coal Chemical Projects > Inner Mongolia Ordos Project Inner Mongolia Ordos: 600kt/a Coal-to-Methanol Distillation Column Retrofit Your browser does not support the video tag. I. Project Background: The Challenge of Mega-Scale   As coal-to-methanol plants scale up to the 600,000 tons/year level, the main distillation column faces unprecedented challenges. Diameters exceeding φ4000mm introduce severe fluid distribution issues. FXSINO (Pingxiang Fangxing) was commissioned to optimize the distillation system for a major energy base in Ordos, Inner Mongolia. Certification Authority This project was executed under our ISO 9001:2015 Quality Management and ISO 14001:2015 Environmental Management Systems. II. Pain Point Analysis: Limitations of Conventional Design   Distributor Bottleneck: Difficulty achieving uniform liquid distribution at φ4300mm. Inter-stage Interference: Turbulence at packing junctions disrupting mass transfer. Stripping Section Load: High-boiling components accumulating at the base. III. Customized Solution: Precision Internal Combinations   1. Rectification Section: Segmented Composite Packing To maximize efficiency, FXSINO utilized 14 meters of 420X Metal Wire Gauze Packing (304 SS). With a specific surface area of 420 m2/m3, it offers superior wettability. To mitigate wall flow, we embedded 0.4~0.5m of TJH25 Sheet Metal Packing between segments. 2. Stripping Section: Hybrid Robust Design The upper stripping section used 7 meters of Alcohol/Water Specialized Packing plus 0.8m of TJH25. Crucially, we retained 13 layers of TF3 Guided Float Valve Trays at the bottom. This leverages the design (Patent No. ZL 2005 3 0048634.6) to handle high temperatures (~120°C). IV. Project Results: Hard Data Witnessing Savings   Key Performance Indicators (KPIs) Pre-Retrofit / Design Actual Operating Results Benefit Analysis Processing Capacity 75 t/h ≥82 t/h Significant flexibility increase Product Purity ≥99.9% Stable at 99.99% 100% Premium Grade Yield Steam Consumption 1.15 t/t Methanol Reduced to 1.08 t/t Methanol Saves tens of thousands of tons/year V. Conclusion & Technical Services   The success of the Inner Mongolia project proves that high-efficiency mass transfer requires a combination of advanced internals and deep process understanding. FXSINO provides turnkey solutions from simulation to installation. Certified Manufacturer & Patent Holder FXSINO (Pingxiang Fangxing Petrochemical Packing Co., Ltd.)Tel: +86 18507999558Website: https://www.fxsino.com "In our industry, steam consumption is everything. We were skeptical about retrofitting, but FXSINO guaranteed a drop in steam usage. Six months post-installation, the data shows a reduction of 0.07 tons per ton of methanol. That translates to millions in savings annually. The payback period was faster than expected." — Operations Director, Ordos Energy Base

  { "@context": "https://schema.org", "@type": "Article", "headline": "Revamp Case Study at a Major Chemical Plant: Design Practices for 30% Efficiency Improvement with Saddle Ring Packing", "description": "A major chemical plant achieved 30% efficiency improvement by revamping their sour water stripper tower with high-performance Saddle Ring packing, material upgrade to 2205 Duplex Steel, and system integration.", "image": "/storage/uploads/images/202603/26/1774496418_5wnaCjjvDc.jpg", "publisher": { "@type": "Organization", "name": "FXSINO", "logo": { "@type": "ImageObject", "url": "https://www.fxsino.com/logo.png" } }, "datePublished": "2026-03-01" } Case Study Revamp Case Study at a Major Chemical Plant: Design Practices for 30% Efficiency Improvement with Saddle Ring Packing Published: March 2026  |  Category: Tower Internals & Packing Optimization Engineer's Brief: A sour water stripper/amine regenerator tower at a major petrochemical complex suffered from severe channeling, high pressure drop (+40%), and inconsistent H2S removal. The revamp combined Super Saddle Ring packing, 2205 Duplex Stainless Steel material, and precision system integration — achieving 30% comprehensive efficiency improvement without altering the main tower structure. 1. Project Background and Challenges Figure 1 — Existing sour water stripper/amine regenerator tower prior to revamp A sour water stripper/amine regenerator tower at a major petrochemical complex in East China had long been plagued by insufficient capacity and high energy consumption. The original tower, packed with conventional random packing, suffered from severe channeling and wall flow after years of operation, leading to poor gas-liquid distribution and diminished mass transfer efficiency. +40% Pressure Drop Increase ↓ H2S Consistency ⚠ Capacity Bottleneck The system pressure drop had increased by approximately 40%, causing a significant rise in reboiler steam consumption. Furthermore, the H2S content in the regenerated acid gas fluctuated, failing to consistently meet environmental and downstream feed specifications. This tower had become a critical bottleneck limiting the plant's capacity for processing high-sulfur crude oil. Revamp Objective: Replace existing packing with high-efficiency packing without altering the main tower structure — targeting 15% capacity increase, improved mass transfer efficiency, and reduced energy consumption. 2. Three Core Design Practices for the 30% Efficiency Improvement The efficiency leap was not the result of a single change but a synergistic optimization across three key dimensions: packing selection, material, and system integration, all targeted at the specific process bottlenecks. 01 Packing Selection Optimization: From Generic to Customized Problem Diagnosis: The original metal Pall Rings showed rapid degradation in liquid film distribution over time in the foaming-prone, viscous amine solution system. Design Practice: Super Saddle Rings were selected to replace the Pall Rings. Their unique asymmetric saddle geometry offers two core advantages: Anti-Channeling Design — The saddle-shaped curves and internal struts disrupt the directional flow of fluids, significantly mitigating wall flow and channeling, leading to a more uniform bed distribution. Enhanced Internal Surface Utilization — Compared to ring-type packings, the concave surfaces of saddle rings better "cradle" the liquid, prolonging liquid film residence time and providing a more tortuous path for gas, thereby increasing the effective mass transfer area. Case Data: Hydraulic performance tests indicated that under the same F-factor, the new Super Saddle Rings reduced the HETP by ~18% and lowered the bed pressure drop by 30–35%, establishing the hydrodynamic foundation for the efficiency gain. 02 Material Upgrade: Matching the Harsh Chemical Environment Problem Diagnosis: The original carbon steel Pall Rings faced risks of general corrosion and stress corrosion cracking (SCC) in the amine environment (containing CO2, H2S, and trace degradation products). Corrosion products could foul the solvent and clog packing voids, exacerbating channeling. Design Practice: Carbon steel was replaced with 2205 Duplex Stainless Steel for the saddle rings. This material combines the advantages of austenitic and ferritic grades: Superior Corrosion Resistance — Offers significantly better resistance to chloride-induced SCC and amine environments compared to 316L, ensuring a longer service life. High Strength — Allows for reduced wall thickness, lowering packing weight, increasing bed void fraction, and further contributing to pressure drop reduction. Case Data: Corrosion coupon tests under simulated conditions showed an annual corrosion rate of <0.01 mm/year for 2205 Duplex Steel. Expected packing service life increased from 4–5 years to >10 years, demonstrating a more favorable TCO. 03 System Integration Design: "Precision Placement" of Packing Problem Diagnosis: Merely changing the packing without optimizing supporting internals yields suboptimal results. The original liquid distributor was no longer suitable for the new packing's performance characteristics. Design Practice: Liquid Distributor Co-Revamp — A trough-type liquid distributor was recalibrated and installed to match the distribution characteristics of the saddle rings, ensuring the number of drip points per unit area was optimized. Bed Structure Optimization — A single tall bed was divided into two shorter beds with an intermediate liquid redistributor. This effectively prevented "scale-up effects" along the column height, maintaining highly uniform gas-liquid distribution across the entire cross-section. Rigorous Installation Protocol — A detailed "dry" layered packing loading procedure and a distributor levelness calibration protocol (tolerance ≤ 3mm) were strictly enforced to ensure perfect translation of theoretical design into practice. Figure 2 — Super Saddle Ring packing installation and bed configuration 3. Revamp Results and Performance Validation The project was executed during the 2025 plant turnaround and started up successfully on the first attempt. Key performance indicators after a 6-month performance test run are shown below: Performance Indicator Before Revamp (Pall Rings) After Revamp (Super Saddle Rings) Improvement Processing Capacity Baseline +18% Exceeded Design Target (15%) Regenerated Acid Gas H2S Fluctuating, Avg. ~22% Stable ≥28% Mass Transfer Efficiency Significantly Improved Tower System Pressure Drop Baseline -32% Key to Energy Reduction Reboiler Steam Consumption Baseline -15% Significant Annual Steam Cost Savings Operational Stability Required frequent adjustments Wide operability window, stable Reduced maintenance workload 4. Conclusion and Key Takeaways Conclusion: This case demonstrates that a chemical tower revamp combining the selection of high-performance Saddle Ring packing, the application of corrosion-resistant alloy materials, and precision system integration design is a reliable pathway to achieving a substantial efficiency leap (approximately 30% comprehensive improvement in this case). This represents not a simple component replacement, but a comprehensive solution rooted in hydrodynamic optimization, materials science, and engineering best practices. Key Technical Takeaways Core Advantage of Saddle Rings — Excellent resistance to channeling and fouling, making them particularly suitable for complex systems like amine solutions, polymerization-prone, or solid-laden services. Material is Critical — In corrosive environments, the choice of packing material directly determines the safety and economics of long-term operation. Systematic Approach — Packing must be designed in synergy with internals like distributors and support plates, coupled with scientific installation practices, to achieve maximum performance. Need a Similar Performance Revamp Assessment for Your Unit? Our engineering team provides end-to-end support from problem diagnosis, process simulation, and design to installation guidance. Contact us to obtain a Feasibility Analysis Report for Packing Optimization tailored to your specific operating conditions. Request a Free Revamp Consultation Download Full Case Study Report

    { "@context": "https://schema.org", "@type": "Article", "headline": "What is the function of the plastic VSP ring?", "description": "A technical guide explaining the function, structure, and applications of the plastic VSP ring (inner arc ring) — a high-performance random packing for absorption, desulfurization, and mass transfer towers.", "author": { "@type": "Organization", "name": "FXSINO" }, "publisher": { "@type": "Organization", "name": "FXSINO", "logo": { "@type": "ImageObject", "url": "https://www.fxsino.com/logo.png" } }, "datePublished": "2026-03-26" } Engineer's Brief: The plastic VSP ring (also called inner arc ring) is a high-performance random packing featuring evenly folded inner arcs along the axial direction, alternately arranged. Its primary function is to promote uniform gas-liquid distribution, reduce channeling and wall flow, and improve mass transfer efficiency in absorption, desulfurization, and decarbonization towers. Made in PP, PE, PVC, CPVC, or PVDF, it delivers 20–30% better distribution uniformity than standard Pall rings in corrosive services where metal packings would fail. 1. What Is the Plastic VSP Ring (Inner Arc Ring)? Figure 1: Plastic VSP Ring (Inner Arc Ring) — bulk PP and PE rings showing the characteristic alternating inner arcs and axial symmetry. Unlike a smooth-walled ring packing, the VSP ring features a series of evenly folded inner arcs along the axial direction, alternately arranged. This geometric modification creates a saddle-like curved channel that disrupts straight-line fluid flow, breaking up laminar films and improving gas-liquid contact. The open arc structure maintains high voidage while the alternating arrangement prevents nesting. The plastic VSP ring is molded from thermoplastic materials including PP, PE, PVC, CPVC, or PVDF — chosen based on service temperature and chemical environment. This makes it a direct alternative to the metal VSP ring (stainless steel 304/316) for corrosive applications where metal would suffer stress corrosion cracking. Key geometric advantages: • Alternating Inner Arcs: Disrupt directional fluid flow, preventing preferential paths and ensuring uniform distribution across the tower cross-section. • Geometric Symmetry: Axial folding creates balanced mechanical stability, reducing nesting and bridging between adjacent rings. • High Void Fraction: Open arc channels maintain low resistance to gas flow — typical pressure drop < 100 Pa/m at operating load. • Corrosion Immunity: Plastic construction eliminates the risk of SCC that plagues metal packings in amine and acidic services. Figure 2: Close-up of VSP ring inner arc structure — the alternating folds create tortuous flow paths for better liquid spreading. 2. Core Functions of the Plastic VSP Ring The plastic VSP ring serves four critical functions in tower operations. Each is rooted in its unique alternating inner arc geometry: 01 Promote Uniform Gas-Liquid Distribution How it works: The alternating inner arc structure disrupts the directional flow of fluids, preventing the formation of preferential paths. This ensures that both gas and liquid are evenly distributed across the tower cross-section, maximizing contact area. Design Advantage: Compared to standard ring packings, the saddle-like curved channels guide fluid along arc paths rather than straight vertical lines, resulting in a more tortuous flow pattern that enhances distribution uniformity. 02 Reduce Channeling and Wall Flow How it works: The saddle-like curved channels guide liquid downward along arc paths, directly reducing wall flow. The alternating arrangement also minimizes overlapping and bridging between adjacent rings, which are common causes of channeling in random packed beds. Design Advantage: By changing the two ends into a rectangular-type contact surface (an improvement derived from the evolution of saddle ring design), bridging between packings is significantly reduced, maintaining high bed void fraction and uniform flow. 03 Enhance Mass Transfer Efficiency How it works: By increasing the tortuosity of the gas path and prolonging liquid film residence time on the concave inner surfaces, the VSP ring provides a more effective mass transfer area than standard ring packings. Design Advantage: The concave surfaces of the inner arcs "cradle" the liquid, increasing the effective interfacial area for gas-liquid contact. This leads to better absorption, desulfurization, and decarbonization performance at lower energy input. 04 Lower Pressure Drop How it works: The open structure and streamlined inner arcs create a high void fraction, allowing gas to pass through with minimal resistance. This reduces the overall pressure drop of the tower system. Design Advantage: Lower pressure drop translates directly into energy savings on fans, blowers, and reboilers. In vacuum towers where pressure drop is critical, plastic VSP rings can significantly improve operability and reduce operating costs. 3. Material Selection: PP, PE, PVC, CPVC, PVDF FXSINO manufactures plastic VSP rings in five thermoplastic materials. Selection depends on operating temperature, chemical compatibility, and mechanical requirements: Material Max Temp Chemical Resistance Best For PP (Polypropylene) 100°C Excellent to acids, alkalis General absorption, FGD, hot water PE (Polyethylene) 80°C Excellent; better UV resistance (black) Ambient cooling, outdoor scrubbers PVC 60°C Excellent to acids, chlorine Chlor-alkali, acidic scrubbing CPVC 90°C Superior to PVC at elevated temp Hot acidic service PVDF 150°C Excellent to most chemicals incl. halogens High-temp amine, aggressive solvents Figure 3: Material options — white PP, black PE, grey PVC, and natural PVDF VSP rings for different service conditions. 4. Performance Comparison with Other Plastic Packings How does the plastic VSP ring compare against other common plastic random packings? Packing Type (50mm) Voidage (%) ΔP @ F=1.5 (Pa/m) Surface Area (m2/m3) Relative Cost Plastic VSP Ring 88–92 70–90 95–110 $$ Plastic Pall Ring 90–92 80–100 100–120 $$ Plastic Saddle (Intalox) 78–82 120–150 85–100 $ Multi-ball Hollow Ball ≥ 95 40–60 160–200 $ Verdict: Plastic VSP rings offer the best resistance to channeling and wall flow among plastic random packings, making them ideal for corrosive absorption and desulfurization. Choose Pall rings if you need maximum efficiency (lower HETP); choose VSP rings if you need superior distribution uniformity and corrosion resistance. 5. Typical Applications • Absorption & Desorption Towers: For gas purification and recovery of SO2, HCl, NH3, and CO2. PP VSP rings handle hot, corrosive scrubbing liquids with excellent chemical resistance. • Desulfurization & Decarbonization: Flue gas desulfurization (FGD) scrubbers and amine regenerator towers benefit from the VSP ring's anti-channeling design and uniform distribution. • Chemical & Metallurgical Industries: Distillation, extraction, and stripping processes where temperatures stay within the plastic's service range (PP up to 100°C, PVDF up to 150°C). • Environmental Protection: Wastewater stripping, VOC removal, and odor control — the corrosion-resistant plastic body ensures long service life without fouling. 6. Installation & Bed Depth Dumping Method: Pour rings evenly across tower cross-section. Do NOT drop from excessive height (> 3m) — use a chute or sock to prevent breakage of thin-wall plastic rings. Support Grid: Use a camel hump support grid with open area ≥ 80%. Bar spacing must be ≤ 0.6 × nominal ring size (e.g., ≤ 15mm for 25mm rings). Bed Limiter: For vacuum or high-gas-velocity service, install a bed limiter / hold-down plate to prevent fluidization of light PP/PE rings. Settling Allowance: Plastic rings can settle 2–5% after initial operation due to nesting and creep. Add 3% extra volume to initial charge. Liquid Distribution: Critical for uniform wetting. Use a liquid distributor with ≥ 50 drip points per m2 for 25–38mm sizes; ≥ 25 points/m2 for 50mm+. Figure 4: VSP ring packing being charged into an absorption tower — even distribution ensures uniform gas-liquid contact. 7. Quick FAQ Q: VSP ring vs. Pall ring — which should I choose? A: Pall rings have internal windows (fingers) that create more internal surface contact, giving slightly better mass transfer (lower HETP). VSP rings have no windows but feature alternating inner arcs that excel at preventing channeling and wall flow. Choose Pall rings for distillation/efficiency-critical service; choose VSP rings for corrosive absorption and services prone to maldistribution. Q: Can I use plastic VSP rings in high-temperature amine service? A: PP grade handles up to 100°C continuously; PVDF handles up to 150°C. For amine regenerator reboiler temperatures (120–150°C), PVDF is recommended. For higher temperatures, metal VSP rings (304/316 SS) are the correct choice. Q: What is the bulk density of plastic VSP rings? A: For 50mm PP VSP rings, expect ~60–70 kg/m3 (including ~5% void settling). PE is slightly heavier at ~75–85 kg/m3. This is light enough that most towers don't need structural reinforcement — unlike ceramic packings at 700+ kg/m3. Get a Quote for Plastic VSP Ring Packing FXSINO is a manufacturer of tower packing & internals — plastic VSP rings, Pall rings, support grids, and liquid distributors. Custom sizes, PP/PE/PVC/CPVC/PVDF materials, shipped worldwide. Tell us your tower diameter, bed depth, service fluid, operating temperature, and preferred material. We'll recommend the right ring size, calculate total volume, and provide a same-day quote with lead time. FXSINO supplies complete packed tower solutions — from support grids and bed limiters to liquid distributors. Contact FXSINO: jackieqiu9202@gmail.com | +86 18507999558

To enhance the efficiency of a scrubber using plastic structured packing, a well-organized approach is essential. Here is a structured strategy based on the thought process outlined: Material Selection 1. Cost-Effectiveness: Opt for plastics that offer a balance between cost and performance, such as PVC for general applications. 2. Chemical Resistance: Depending on the scrubber's environment, select materials like polypropylene or PVDF for resistance to acids, alkalis, or other corrosive substances. 3. Durability: Choose plastics that can withstand the operational conditions, including temperature and mechanical stress.   Packing Design 1. Surface Area: Utilize structured packing with a high specific surface area to maximize gas-liquid interaction. 2. Design Types: Consider honeycomb structures for better gas distribution and corrugated sheets for enhanced mechanical strength and contact efficiency.    Flow Optimization 1. Gas Flow Rate: Adjust the gas flow to ensure sufficient interaction time with the liquid without compromising efficiency. 2. Pressure Drop: Aim for packing that minimizes pressure drop to reduce energy consumption and enhance overall system efficiency. Environmental Considerations 1. Sustainability: Choose materials and designs that align with sustainability goals, minimizing environmental impact. 2. Recyclability: Opt for plastics that can be recycled to reduce waste and promote a circular economy. Maintenance and Durability 1. Regular Maintenance: Implement a schedule for cleaning and inspection to prevent fouling and ensure optimal performance. 2. Lifespan Management: Consider the lifespan of the packing material to reduce long-term replacement costs. By systematically addressing these areas, the strategy aims to maximize the scrubber's performance while ensuring cost-effectiveness, durability, and environmental sustainability. This approach not only enhances operational efficiency but also supports long-term effectiveness and ecological responsibility.

    { "@context": "https://schema.org", "@type": "Article", "headline": "Durable Metal Structured Packing for Demanding Petrochemical Applications", "description": "A technical guide on metal structured packing — its design, durability advantages, and why it is the preferred choice for demanding petrochemical separation towers including crude distillation, vacuum towers, and amine regenerators.", "author": { "@type": "Organization", "name": "FXSINO" }, "publisher": { "@type": "Organization", "name": "FXSINO", "logo": { "@type": "ImageObject", "url": "https://www.fxsino.com/logo.png" } }, "datePublished": "2026-03-26" } Engineer's Brief: Metal structured packing is the gold standard for demanding petrochemical separation towers where high throughput, ultra-low pressure drop, and long service life under corrosive/thermal cycling conditions are non-negotiable. Fabricated from stainless steel 304/316/410 or carbon steel, structured packings deliver predictable HETP, excellent liquid distribution, and decades of reliable operation in crude distillation, vacuum gas oil (VGO) units, and amine regenerators. 1. What Is Metal Structured Packing? Metal structured packing consists of corrugated metal sheets or wire gauze arranged in a geometric, repeating pattern to form a highly organized packed bed. Unlike random packings (e.g., Metal Super Raschig Rings or Metal Intalox Saddles), the geometry is predetermined and uniform throughout the tower cross-section, eliminating the randomness that causes channeling and maldistribution. The corrugated sheets are typically perforated and embossed with texturing to promote liquid spreading. Sheet metal packings (250Y, 350Y, 500Y) are the workhorses for petrochemical services, while wire gauze packings (BX, CY) are reserved for high-purity distillation where maximum efficiency is required. Key construction materials: • SS304 / SS304L: General-purpose austenitic stainless steel for most petrochemical services; excellent resistance to organic acids and moderate chlorides. • SS316 / SS316L: Enhanced molybdenum content for superior resistance to chlorides, sulfides, and acidic crude fractions. • SS410: Martensitic stainless steel offering higher mechanical strength at elevated temperatures; suitable for catalytic distillation and high-pressure fractionators. • Carbon Steel: Cost-effective for non-corrosive hydrocarbon services such as atmospheric crude distillation and naphtha stabilization. 2. Why Metal Structured Packing Excels in Petrochemical Applications Petrochemical separation towers operate under some of the most demanding conditions in the process industries — high temperatures, corrosive fluids, deep vacuum, and tight product specifications. Metal structured packing addresses these challenges through four core strengths: 01 Ultra-Low Pressure Drop Why it matters: In vacuum towers (e.g., vacuum gas oil units operating at 20–50 mmHg absolute), every millibar of pressure drop directly reduces product yield and increases cutter temperature. Structured packing delivers pressure drop as low as 0.1–0.3 mbar per theoretical stage. Design Advantage: The organized, parallel flow channels minimize flow resistance while maintaining high interfacial area. Compared to trays or random packings, structured packing can reduce total column pressure drop by 50–80% in deep vacuum service. 02 High Throughput Capacity Why it matters: Petrochemical plants demand maximum throughput from existing assets. Structured packing's open structure allows higher F-factor operation (2.0–3.5 Pa0.5) before flooding, compared to 1.5–2.0 for random packings. Design Advantage: The corrugation angle (typically 45° for Y-type, 60° for X-type) balances gas-liquid contact time with flow capacity. Y-type (250Y, 350Y) is the standard for petrochemical fractionators; X-type is used where maximum capacity is needed. 03 Predictable, Uniform Efficiency Why it matters: Product specifications in petrochemicals are tight — gasoline RVP, diesel cetane, ethylene purity. Structured packing delivers consistent HETP (Height Equivalent to a Theoretical Plate) across the entire bed, typically 0.2–0.5m for sheet metal types. Design Advantage: Unlike random packings whose efficiency depends on bed depth and initial distribution, structured packing's geometric regularity ensures every cubic meter performs identically. This enables accurate column sizing and reliable scale-up from pilot to commercial. 04 Durability & Long Service Life Why it matters: Petrochemical towers undergo thermal cycling, fouling, and occasional upsets. Metal structured packing resists deformation, creep, and corrosion — typical service life exceeds 10–15 years with proper liquid distribution. Design Advantage: The continuous corrugated sheet structure provides excellent mechanical integrity. Perforations and embossed texture prevent liquid channeling while maintaining structural rigidity. Material selection (316L for sour service, 410 for high-temp catalytic) ensures corrosion resistance matches the duty. 3. Common Types & Specifications FXSINO supplies a full range of metal structured packings for petrochemical services: Type Specific Surface (m2/m3) Voidage (%) Typical HETP (m) Best For 125Y 125 98 0.35–0.50 Atmospheric crude, large-diameter columns 250Y 250 97 0.25–0.40 General fractionation, vacuum towers 350Y 350 95 0.20–0.30 High-purity distillation, ethylene 500Y 500 93 0.15–0.25 Fine separation, small-diameter columns BX (Wire Gauze) 500 90 0.10–0.20 High-purity, low-load distillation 4. Typical Petrochemical Applications • Crude Distillation Units (CDU): Atmospheric and vacuum towers benefit from structured packing's low pressure drop and high capacity. 250Y and 350Y are standard for side-strippers and main fractionators. • Vacuum Gas Oil (VGO) Units: Deep vacuum operation (10–50 mmHg) demands ultra-low ΔP. Structured packing is the only viable choice to maximize cutter yield and minimize thermal cracking. • Amine Regenerators: CO2 and H2S removal from sour gas streams. SS316L structured packing resists amine degradation products and hot potassium carbonate corrosion. • Catalytic Distillation: Reactive distillation columns (e.g., MTBE, TAME synthesis) use structured packing as catalyst support. SS410 offers the mechanical strength and thermal stability required. • Olefin Separation: Ethylene-ethane and propylene-propane splitters require high-efficiency 350Y or 500Y to achieve polymer-grade purity within practical column heights. 5. Installation & Support Considerations Bed Installation: Structured packing is installed in stacked layers (typically 100–300mm per bed). Each layer must be leveled precisely — a deviation > 3mm per meter causes liquid maldistribution and efficiency loss. Liquid Distribution: Critical. Structured packing is unforgiving of poor distribution — use a high-quality liquid distributor with ≥ 100 drip points per m2 for 250Y/350Y; ≥ 200 points/m2 for 500Y. Bed Limiters: Install hold-down grids above each structured packing bed to prevent lifting under high gas velocity or pressure surges. Inspection & Cleaning: Periodic CUI (corrosion under insulation) checks and mechanical cleaning if fouling occurs. Structured packing can often be cleaned in-place with solvent wash or steam-out. 6. Quick FAQ Q: Structured packing vs. random packing — which for petrochemical? A: For new builds and revamps where pressure drop, capacity, or efficiency are critical (vacuum towers, high-purity splitters), structured packing is the clear winner. Random packings like Metal Super Raschig Rings are still valid for less demanding services, smaller diameters, or where budget is the primary constraint. Q: What material for sour service (high H2S + CO2)? A: SS316L is the standard for amine regenerators and sour water strippers. For extremely aggressive conditions with chlorides > 50 ppm, consider duplex stainless (2205) or higher-alloy materials. Q: Can structured packing be retrofitted into an existing tray column? A: Yes. Replacing trays with structured packing is a common revamp strategy to increase capacity by 20–50% and reduce pressure drop. FXSINO provides complete EPC support including tower internals, distributors, and packing installation supervision. Get a Quote for Metal Structured Packing FXSINO is a manufacturer of tower packing & internals — metal structured packing, Metal Intalox Saddles, Metal Super Raschig Rings, and complete column internals. Custom materials, shipped worldwide. Tell us your tower diameter, service fluid, operating pressure/temperature, and separation requirements. We'll recommend the right packing type, calculate bed height, and provide a same-day quote with lead time. Contact FXSINO: jackieqiu9202@gmail.com | +86 18507999558

    { "@context": "https://schema.org", "@type": "Article", "headline": "Detailed Explanation of the Structure and Design Characteristics of Ceramic Saddle Ring Packing", "description": "A technical guide explaining the geometry, structural details, and design characteristics of ceramic saddle ring (ceramic Intalox saddle) packing — a high-durability random packing for high-temperature, highly corrosive absorption, drying, and scrubbing towers.", "author": { "@type": "Organization", "name": "FXSINO" }, "publisher": { "@type": "Organization", "name": "FXSINO", "logo": { "@type": "ImageObject", "url": "https://www.fxsino.com/logo.png" } }, "datePublished": "2026-03-26" } Engineer's Brief: The ceramic saddle ring (also called ceramic Intalox saddle ring) is a classic random packing whose shape sits between a ring and a saddle. Its asymmetric double-arc body prevents nesting, promotes point contact between pieces, and keeps bed voidage high (70–85%). Molded from chemical porcelain or high-alumina ceramic, it resists all inorganic/organic acids except HF and runs continuously at 1000–1200°C — making it irreplaceable in sulfuric acid dryers, hot acid gas scrubbers, and high-temperature corrosive towers where plastic and metal packings fail.[8,21](@ref) 1. What Is Ceramic Saddle Ring Packing? Figure 1: Ceramic saddle ring (Intalox saddle) — bulk chemical-porcelain pieces showing the characteristic saddle-shaped curved body. The ceramic saddle ring evolved from the earlier Berl saddle (arc saddle). Its key modification is that the symmetrical arc saddle ends are changed into a rectangular-type contact surface, while the body keeps a saddle-like double curvature — one concave outer face, one convex inner face, open at both ends with no closed cavity.[8,15](@ref) This semi-ring, semi-saddle geometry is why it is also marketed as "rectangular saddle ring" or "Intalox saddle ring". Unlike metal Intalox saddles or plastic hollow ball packings, the ceramic version trades some specific surface area for extreme chemical inertia and thermal endurance. It is a random dumping packing — poured loosely into the tower without stacking order. 2. Geometric Structure Breakdown The shape is engineered, not arbitrary. Each element is a continuous extruded/compressed ceramic body with the following structural traits: 01 Asymmetric Double-Arc Body Geometry: Two arcs of different curvature meet at a central ridge. One face is concave (outer saddle), the other convex (inner saddle). Ends are truncated into roughly rectangular planes rather than symmetric arcs.[2,8](@ref) Design Effect: The asymmetry stops pieces from rotating into identical orientation; random dump produces mixed angles, so neighboring saddles touch at points instead of nesting face-into-face. This breaks up dead zones and keeps void distribution uniform. 02 Rectangular End Contact Surface Geometry: Both open ends terminate in near-rectangular flats instead of continuing arcs (the improvement over original Berl saddle).[8,15](@ref) Design Effect: Rectangular ends reduce bridging/overlapping that pure arc saddles suffer. They also give a small stable seating plane so a saddle rests on neighbors without rolling into a nested pair — raising effective voidage vs. Raschig rings of the same nominal size. 03 Open Dual-End Channel, No Closed Cavity Geometry: Hollow through-body, open at both truncated ends, no interior blind pocket.[8,25](@ref) Design Effect: Gas and liquid pass through the same opening rather than only skimming an outer wall. Liquid films form on both concave and convex faces; gas takes curved low-resistance paths. No trapped pocket means less foulant accumulation in slurry scrubbing. 04 Surface Texture & Wall-Thickness Variation Geometry: Fired ceramic surface carries micro-roughness and slight embossing; wall is slightly thicker near the central ridge (load path) and thinner toward edges.[2](@ref) Design Effect: Micro-roughness improves wettability (liquid spreads into thin film, not beads). Local thickening at the ridge raises crush strength (≥ 4.4 N/mm² compressive; bulk pieces ≥ 3000 N for DN50) without adding total weight.[9,20](@ref) Figure 2: Single ceramic saddle ring — rectangular ends, double-arc body, open through-channel. 3. Material & Dimensional Design Ceramic saddle rings are formed by extrusion or dry pressing of chemical-porcelain / high-alumina body, then fired at 1200°C+ to produce a dense sintered matrix (SiO₂ 65–75%, Al₂O₃ 17–23%, Fe₂O₃ <1.5%).[5,9](@ref) Design consequences: • Chemical inertness: Resists all inorganic acids, organic acids, solvents; only HF and hot concentrated alkali attack it. Acid resistance ≥ 99.6%.[6,21](@ref) • Thermal limit: Continuous 1000–1200°C; short peak ~1400°C; low thermal expansion, good thermal-shock cycling.[9,21](@ref) • Low absorption: Water absorption ≤ 0.5%, density 2.3–2.9 g/cm³ — no swelling, no leachate contaminating product.[5,20](@ref) • Dimensional control: Outer-diameter tolerance ±0.5mm (small), ±1mm (DN76+); height ±0.8–1.5mm; wall ±1mm.[10](@ref) Standard nominal sizes 16 / 19 / 25 / 38 / 50 / 76 mm. Typical geometry table: Size (mm) D × H × T (mm) Surface Area (m2/m3) Voidage (%) Bulk Density (kg/m3) 25 25 × 19 × 3 250 74 610 38 38 × 30 × 4 164 75 590 50 50 × 40 × 5 142 76 560 76 76 × 57 × 9 92 78 520 Data per common ceramic Intalox saddle specs.[5,18](@ref) 4. Design Characteristics That Matter in Operation • Anti-nesting & uniform void: Asymmetric saddle + rectangular ends → point contact, no face nesting, voidage 70–85% held uniform across bed.[2,8](@ref) • Low ΔP, high flood point: Curved open channels give tortuous-but-low-resistance gas path; pressure drop ~25% lower than same-size Raschig rings; higher allowable vapor velocity before flooding.[4,8](@ref) • Liquid film control: Micro-rough ceramic + concave/convex faces spread thin liquid film on both sides; arc ridges cut wall flow and channeling.[2,15](@ref) • Mechanical survival: Crush strength ≥ 4.4 N/mm², bulk piece ≥ 3000 N (DN50); survives deep-bed self-weight and thermal cycling without spalling.[9,20](@ref) • Upgrade path — Super saddle: Ceramic Super Intalox saddle replaces smooth arcs with serrated/corrugated edges and adds inner-outer openings, pushing voidage to ~78–84% and cutting ΔP further.[12,22](@ref) 5. Where the Structure Pays Off The structure is purpose-built for hot, acidic, oxidizing gas-liquid contact where metal corrodes and plastic melts:[8,21](@ref) • Sulfuric acid plant: Drying tower (98% H₂SO₄) and absorption tower — ceramic saddle is the default packing. • Hot flue-gas scrubbing: SO₂/NOₓ removal with limestone slurry, HCl exhaust, chlorine drying. • High-temp distillation/stripping: Where service > 150°C rules out plastic; e.g., certain caustic evaporation tails. • Metallurgy & coke-oven gas: Ammonia liquor scrubbing, naphthalene wash, gas cooling towers. 6. Quick FAQ Q: Saddle ring vs. Raschig ring in ceramic — structurally? A: Raschig ring is a plain hollow cylinder — tends to stack in columns, creates dead zones, higher ΔP. Saddle ring's asymmetric double-arc + rectangular ends force point contact and uniform voids, giving lower pressure drop and better distribution at equal size.[8,21](@ref) Q: Why not use metal Intalox saddle instead? A: Metal versions (304/316) win on strength-to-weight and some efficiency cases, but dissolve in sulfuric/nitric/hydrochloric acid service and soften far below ceramic's 1000°C+ ceiling. In acid plants ceramic is mandatory.[21](@ref) Q: Any structural weak point? A: Ceramic is brittle — do not drop from height > 2m during charging; use chute. Avoid HF and hot concentrated NaOH. Otherwise the sintered body outlasts most tower shells. Get a Quote for Ceramic Saddle Ring Packing FXSINO manufactures ceramic Intalox saddle rings, Super Intalox saddles, ceramic Raschig rings, and tower internals. Sizes 16–76mm, chemical porcelain or high-alumina, shipped worldwide. Send tower diameter, bed depth, service fluid (note if HF present), operating temperature, and preferred size. We'll confirm material grade, packing volume, and lead time the same day. Contact FXSINO: jackieqiu9202@gmail.com | +86 18507999558

Liquid distributor is a fluid distribution equipment widely used in industries such as chemical, petroleum, and pharmaceutical. It can effectively distribute fluids evenly into various branch pipelines through design and working mechanisms, thereby ensuring the stability of the production process and product quality. 1、 Working mechanism The trough distributor is mainly composed of trough, distribution pipe, connectors, and other parts. Its working principle is to use the fluid dynamics principle inside the trough to introduce fluid from the main pipeline into the trough, and then evenly distribute it to each branch pipeline through the distribution pipe. Specifically, when the fluid enters the trough, a certain flow velocity and pressure distribution will be formed inside the trough. Due to the shape and structural design of the groove disk, the fluid will generate rotation and vortex effects inside the groove disk, making the fluid more evenly distributed inside the groove disk. Subsequently, the fluid flows into each branch pipeline through the distribution pipe, achieving uniform distribution of the fluid. 2、 Application advantages Uniform distribution: It can effectively distribute fluid evenly to each branch pipeline, avoiding production instability and product quality problems caused by uneven fluid distribution. Compact structure: Adopting a compact design, it occupies a small area and is easy to install and maintain. Strong corrosion resistance: Usually made of corrosion-resistant materials, it can adapt to various harsh working environments and extend the service life of equipment. Easy adjustment: The number and flow rate of branch pipelines can be adjusted according to actual needs, with strong flexibility and adaptability. Safe and reliable: Safety and reliability factors are fully considered in the design process, which can ensure the safe and stable operation of the production process. 3、 Application Fields Tray distributors are widely used in fluid transportation and distribution systems in industries such as chemical, petroleum, pharmaceutical, and food. For example, in chemical production, it can be used to evenly distribute raw materials into various reaction vessels; In the petroleum industry, it can be used to evenly distribute crude oil into various refining units; In the pharmaceutical industry, it can be used to evenly distribute medication to various preparation equipment.

Polyhedral hollow ball are processed from polypropylene (PP). Mainly used for the removal of gases such as oxygen, chlorine, carbon dioxide, etc. in cooling towers and purification towers. The appearance is spherical, with main specifications including φ 25mm, φ 38mm, φ 50mm, and φ 76mm. Multi sided hollow spheres can purify water quality and meet national standards when used for sewage treatment. It mainly plays a role in gas-liquid contact, achieving heat and mass transfer. Increasing the area of gas-liquid contact inside the tower is an important component that affects the heat and mass transfer of the tower.   Polyhedral hollow ball is a type of filler made of plastic with a spherical appearance. It is composed of two hemispheres, each with 12 blades in a semi fan shape. The upper and lower blades of the two hemispheres are offset from each other. This type of packing structure has the advantages of high gas velocity, low resistance, large specific surface area, and high operational elasticity. However, due to the large number of blades in the multi-faceted hollow sphere, there is a shielding effect between them, which is not conducive to the distribution and wetting of liquids. Most liquids gather in the hollow column of the sphere, which affects the smoothness of gas flow. Polyhedral hollow ball are injection molded, while ordinary fillers are made of polyethylene plastic. This biological filler is extremely beneficial for the attachment and growth of microorganisms inside the filler, and the biofilm produced is relatively stable, making it prone to fluidization. 

Tri pack is a functional product or device that combines environmental protection concepts and technological innovation, aimed at reducing environmental pollution, improving resource utilization efficiency, or promoting ecological protection. The original intention of its design is to solve environmental problems in daily life or industrial scenarios through simple and reusable methods. Environmentally friendly ball fillers play various key roles in environmental engineering, which can be further divided into the following aspects: 1、 Physical effects Increase contact area Porous structure design (such as honeycomb or corrugated) significantly increases the gas-liquid or liquid-liquid contact area, promoting mass transfer efficiency. For example, in an absorption tower, the contact area between exhaust gas and treatment solution can be increased by 3-5 times. 2、 Biochemical action Biofilm carrier   The specific surface area can reach 800m ²/m ³, providing attachment space for microorganisms such as nitrifying bacteria. A case study of a sewage treatment plant shows that the use of environmentally friendly balls increases the thickness of the biofilm by 2 times and increases the removal rate of ammonia nitrogen by 35%.         Environmentally friendly balls made of different materials (such as PP, PVC, ceramics) are suitable for specific scenarios, and the selection should take into account factors such as pollutant properties, operating temperature, and cost. With the development of surface modification technology, new environmentally friendly balls are evolving towards functionalization (such as magnetism and photocatalysis) and intelligence (such as load sensors

Introduction to Stainless Steel pall Ring Packing: Metal pall Ring is an efficient packing widely used in chemical, environmental protection, refining and other fields. Its design and performance make it an important filling material in tower interiors. Below, we will provide a detailed explanation of the metal ball ring from the aspects of structural characteristics, application cases, and performance data.   The structural characteristics of stainless steel pall rings: Metal pall rings are a new type of filler designed and improved based on traditional Raschig rings. It adopts a double-layer wall structure, with multiple uniformly distributed windows on the ring wall. These windows not only increase the specific surface area of the packing, but also improve the mass transfer efficiency between gas and liquid. At the same time, the height to diameter ratio of the metal ball ring is usually controlled within a certain range. This design enables the packing to form a more uniform distribution inside the tower, reducing short circuits and wall flow phenomena in the airflow.   Application case of stainless steel pall rings: In the chemical industry, metal pall rings are widely used inside various towers, such as absorption towers, distillation towers, extraction towers, etc. Taking the distillation tower of a large refinery as an example, the tower originally used traditional Raschig rings as packing, but during operation, it was found that the purity of the product at the top of the tower could not meet the design requirements. Later, the factory decided to use metal ball rings to renovate the tower. After the renovation, the purity of the tower top product has been significantly improved, and the pressure drop inside the tower has also been significantly reduced, thereby improving the energy efficiency of the entire production process. In addition, metal ball rings also play an important role in the wastewater treatment process in the field of environmental protection. A certain sewage treatment plant used metal Bao'er rings as the packing material for the bioreactor when treating industrial wastewater containing high concentrations of organic matter. Due to its excellent mass transfer performance and large specific surface area, metal Bao'er rings provide a favorable environment for the growth and reproduction of microorganisms. After a period of operation, the wastewater treatment efficiency of the factory has been significantly improved, and the effluent quality has reached the national discharge standards.    

FXSINO · Technical Guide Pingxiang Fxsino Petrochemical Packing Co., Ltd. How to Choose High-Quality Ceramic Structured Packing? 如何选型高品质陶瓷规整填料？ August 13, 2025 | By FXSINO Technical Team | Reading time: ~6 min ▶ Overview 概述 Ceramic corrugated structured packing is a premium type of tower packing made from high-grade chemical porcelain or clay. It features a honeycomb structure with inclined corrugations arranged in a regular pattern①. Unlike random packings, this structured design provides a highly efficient and organized pathway for gas and liquid flow, making it indispensable in critical chemical processes. 1 Understanding Specifications and Dimensions 规格与尺寸解析 Ceramic structured packing is categorized by its specific surface area, represented by models such as 700Y, 450Y, 350Y, 250Y, and 150Y②. The "Y" denotes a standard corrugation inclination angle of 45 degrees. Model Selection A higher model number (e.g., 700Y) indicates a larger surface area per unit volume, which enhances mass transfer efficiency but also increases pressure drop③. The correct model must be selected based on the required theoretical stages and gas-liquid load. Dimensional Parameters Each specification comes with precise dimensions for length, width and height. The tower diameter directly influences the required sheet size, ensuring a seamless fit during installation. 2 Key Technical Parameters 关键技术参数 Parameter 参数 Description 说明 Impact 影响 Specific Surface Area (a) Contact area between gas & liquid phases ↑ Efficiency Void Fraction (e) Percentage of empty space within packing ↑ Throughput Theoretical Plate Number Reflects separation efficiency ↑ Purity Pressure Drop Critical for energy consumption ↓ Cost Hydrophilicity Natural wettability, thin liquid films ↓ Drying 3 Advantages and Material Properties 优势与材质特性 🛡️ Exceptional Corrosion Resistance Superior resistance to almost all inorganic acids (except HF & hot concentrated alkalis), ideal for H₂SO₄ & HNO₃ systems④. 🔥 High-Temperature Stability Withstands continuous operating temperatures up to 1000°C⑤, perfect for high-temp rectification units. 💧 Reduced Fouling Smooth, angled channels facilitate efficient drainage, minimizing liquid hold-up and coking risks. 4 Why Partner with FXSINO? 为何选择方兴石化？ Choosing the right manufacturer is as important as selecting the right material. At Pingxiang Fxsino Petrochemical Packing Co., Ltd., we specialize in high-end ceramic tower internals. Our ceramic structured packing features precise dimensional tolerances and uniform corrugation angles, ensuring optimal hydraulic performance. ✔ What We Offer 我们的服务 ▸ CAD drawings for tower layout ▸ CFD simulation analysis ▸ On-site installation guidance ▸ Customized size & material ▸ Material test certificate (MTC) ▸ Lifetime technical support Whether you are upgrading an existing facility or designing a new plant, our team is ready to deliver customized solutions that meet your exact specifications. 📞 Contact FXSINO Technical Team From material selection and hydraulic design to on-site installation guidance — we deliver end-to-end solutions for sulfuric acid, nitric acid, and high-temperature chemical separation. 📱 Get a Tailored Proposal FXSINO · CERAMIC STRUCTURED PACKING · TECHNICAL GUIDE