GB/T 37187-2018 in English
VALIDTechnology requirement of the anti--corrosion materials for desulfurization chimneys
- Issued on:2018-12-28
- Implemented on:2019-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 37187-2018脱硫烟囱用防腐蚀材料技术要求》由TC381（全国腐蚀控制标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
Analysis of the core content of the standard
This standard systematically regulates the technical system of anti-corrosion materials for wet flue gas chimneys, including the performance requirements and test methods of 7 major types of materials such as glass flake mortar and titanium steel composite plate. It is suitable for highly corrosive working conditions with flue gas temperature of 50-80℃ and pH value of 1-3.
Material classification and technical index comparison
| Material type | Applicable parts | Key indicators | Typical values |
|---|---|---|---|
| Coating type | Metal/concrete surface | Adhesion, acid resistance | Steel base ≥8MPa, resistant to 20%H₂SO₄14d |
| Fiber reinforced plastic | Independent inner tube | Hanging tensile strength | Suspension type ≥280MPa |
| Titanium alloy material | Smoke exhaust inner tube | Shear strength | ≥140MPa |
Detailed explanation of key technical requirements
1. Composite coating system
The standard requires that the composite system consisting of primer, midcoat and topcoat must pass 6 rigorous tests such as 150℃ heat resistance and 20% sulfuric acid immersion. Among them, the wear resistance of glass flake mortar is ≤50mg (500g/1000 turns) and water vapor permeability coefficient is ≤1.5×10⁻⁵g/(m·s·Pa).
2. Metal materials
Titanium-steel composite plates must meet the following requirements:
- Titanium layer thickness ≥1.2mm
- Shear strength ≥140MPa
- Roughness ≤15mm/m
Typical test method
Sulfuric acid tolerance test (Appendix B)
Simulate material performance under abnormal working conditions:
- The sample is immersed in 20% sulfuric acid for 1 hour
- Dried at 150℃ for 2 hours
- Cooled at room temperature for 1 hour
- After 30 cycles, evaluate the blistering, cracking, etc.
Engineering Application Suggestions
Based on the experience of standard implementation:
- For chimneys without GGH system, integral FRP inner tube or titanium composite plate is preferred
- During the construction of foam brick lining, it is necessary to ensure that the shear strength of the adhesive and the primer is ≥1.0MPa
- Acid-resistant castables should be used in conjunction with an anti-seepage isolation layer, and the natural drying shrinkage rate must be ≤2.0%
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