Stainless Steel Coil Tube for Coal Water Slurry (CWS) Gasification Burner
Product Overview
The stainless steel coil tube is a specialized heat-resistant and corrosion-resistant tubular component engineered for demanding industrial applications, particularly within Coal Water Slurry (CWS) gasification systems. Designed and supplied by Wenzhou Jixing Metal Materials Co., Ltd., this coil tube serves as a critical component in gasification burner assemblies, where it functions as a cooling jacket, fuel delivery conduit, or structural element exposed to extreme thermal gradients, abrasive slurry flows, and aggressive chemical environments.
The coil tube is manufactured in a continuous helical configuration, allowing for flexible routing, compact installation, and efficient heat exchange performance. The product has been optimized through iterative engineering studies focused on enhancing thermal stability, extending service life, and reducing failure rates in high-temperature gasification environments.
Material & Properties
The coil tube is fabricated from high-grade austenitic and austenitic-ferritic stainless steel grades selected for superior resistance to thermal shock, oxidation, carburization, and slurry-induced corrosion. Typical material specifications include:
- AISI 310 / 310S — High-temperature oxidation resistance up to 1150 °C, suitable for burner throat and flame contact zones.
- AISI 321 / 321H — Titanium-stabilized grade providing enhanced resistance to intergranular corrosion and thermal cycling fatigue.
- AISI 347 / 347H — Niobium-stabilized variant offering superior strength retention at elevated temperatures.
- Super-austenitic grades (e.g., Alloy 625, Alloy 800H) — For the most aggressive CWS gasification environments requiring maximum creep resistance and thermal stability.
Key mechanical and physical properties:
- Operating temperature range: −196 °C to 1200 °C (grade-dependent)
- Thermal expansion coefficient: 16–18 × 10⁻⁶ /°C
- Yield strength (at 600 °C): ≥ 200 MPa (grade-dependent)
- Corrosion resistance: Excellent against sulfur, carbon, and alkali metal compounds in CWS syngas
- Weldability: High; compatible with TIG (GTAW), MIG (GMAW), and orbital welding processes
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (盘管) |
| Product Code / Serial No. | 594 |
| Configuration | Continuous helical coil / spring-wound coil |
| Outer Diameter (OD) | 12 mm – 114 mm (customizable) |
| Wall Thickness | 0.5 mm – 6.0 mm (customizable) |
| Coil Pitch | 15 mm – 100 mm (application-dependent) |
| Coil Length | Up to 30 m continuous length (standard) |
| Surface Finish | 2B, BA (Bright Annealed), or Polished (Ra ≤ 0.8 μm) |
| Material Grades | 310S, 321, 347, 321H, 347H, Alloy 625, Alloy 800H |
| Applicable Standards | ASTM A213, ASTM A269, ASTM B407, EN 10216-5, GB/T 12771 |
| Tolerance | OD: ±0.1 mm; Wall thickness: ±0.05 mm |
| End Treatment | Plain end, beveled end, or pre-welded fittings |
| Maximum Operating Pressure | Up to 4.0 MPa (design-dependent) |
| Maximum Operating Temperature | Up to 1200 °C (grade-dependent) |
| Supplier | Wenzhou Jixing Metal Materials Co., Ltd. |
Manufacturing Process
The production of high-performance stainless steel coil tubes follows a rigorous multi-stage manufacturing process to ensure dimensional accuracy, metallurgical integrity, and long-term service reliability:
- Raw Material Selection & Inspection — Certified stainless steel seamless tubes or precision-welded pipes are sourced from qualified mills. Incoming material undergoes spectroscopic analysis (OES) to verify chemical composition, along with mechanical testing (tensile, hardness) and hydrostatic pressure testing.
- Coil Winding / Spring Coiling — The straight tube is wound into a precise helical configuration using CNC-controlled coil winding machinery. Coil pitch, diameter, and number of turns are maintained within tight tolerances (±0.5 mm) to ensure uniform geometry and predictable thermal behavior.
- Welding & Joining — Where continuous coil length requires splicing, high-integrity welds are produced using orbital TIG welding (GTAW) with inert gas shielding (argon or argon-helium mix). Weld joints are 100% inspected via radiographic testing (RT) or ultrasonic testing (UT).
- Heat Treatment — Solution annealing is performed at 1050–1150 °C followed by controlled cooling to restore full austenitic microstructure, relieve residual stresses, and optimize corrosion resistance. Stabilization treatment may be applied for Ti- or Nb-stabilized grades.
- Surface Treatment — Depending on application requirements, the coil tube may undergo pickling and passivation (acid bath treatment), mechanical polishing, or electropolishing to achieve the specified surface finish and enhance passive film integrity.
- Final Inspection & Quality Control — Each coil tube undergoes comprehensive final inspection including dimensional verification, visual examination, non-destructive testing (NDT), and certification documentation.
Applications
The stainless steel coil tube is designed for use in the following demanding industrial applications:
- Coal Water Slurry (CWS) Gasification Burners — Primary application; serves as cooling coils, fuel injection manifolds, and structural components within gasifier burner assemblies operating at 1400–1600 °C.
- Gasification Burner Optimization — Engineered coil geometries improve flame stability, reduce burner throat erosion, and extend maintenance intervals in CWS gasification reactors.
- Boiler & Heat Exchanger Systems — Used in superheater coils, economizer tubes, and thermal oil heating systems requiring high-temperature resistance.
- Petrochemical & Refining — Applied in cracking furnaces, reformer tubes, and heat transfer coils in hydroprocessing units.
- Power Generation — Utilized in waste heat recovery (WHR) systems, combined cycle power plants, and industrial steam generation.
- Specialty Industrial Heating — Deployed in glass manufacturing furnaces, ceramic kilns, and metal heat treatment ovens.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management framework ensuring product reliability and regulatory compliance:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System
- ISO 45001 — Occupational Health and Safety Management System
- EN 10204 3.1 — Material certification with full traceability documentation
- NACE MR0175 / ISO 15156 — Compliance for sour service applications (where applicable)
- ASME / PED 2014/68/EU — Pressure equipment directives compliance
- Third-Party Inspection — Available upon request through recognized inspection bodies (e.g., SGS, Bureau Veritas, DNV)
Every coil tube shipment is accompanied by a full mill test certificate (MTC), chemical composition analysis, mechanical test results, dimensional inspection report, and non-destructive testing documentation, ensuring complete traceability from raw material to final delivery.
Unique Selling Points
- Optimized for CWS Gasification — Coil tube geometry and material selection are specifically engineered based on optimization studies for coal water slurry gasification burner environments, addressing thermal fatigue, erosion-corrosion, and chemical attack challenges unique to CWS systems.
- Precision Coil Geometry — CNC-controlled winding ensures uniform coil pitch and diameter, enabling predictable heat transfer performance and simplified installation in confined burner assemblies.
- Extended Service Life — Advanced material grades and optimized heat treatment extend coil tube operational life by up to 40% compared to conventional alternatives, reducing unplanned downtime and maintenance costs.
- Customization Capability — Flexible customization of OD, wall thickness, coil pitch, length, and end treatment to meet specific gasifier design requirements and OEM specifications.
- Full Traceability — End-to-end quality documentation from mill certification to final inspection ensures compliance with the most stringent industrial standards and regulatory requirements.