GB/T 31819-2023
Technical Specifications for Chimney Corrosion Resistance after Liquid Fluorine Rubber Coating and Desulfurization (English Version)
- Standard No.
- GB/T 31819-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 31819-2023
- Replace
- GB/T 31819-2015
- Scope
- This document specifies the base treatment, fluororubber lining operation, operation safety, material indicators and project acceptance requirements for the corrosion-resistant operation of chimneys after liquid fluororubber coating desulfurization. This document is applicable to the corrosion-resistant materials and operations of the lining of new and old reinforced concrete chimneys, steel chimneys, brick chimneys and other exhaust pipes after wet desulfurization in thermal power plants.
- Introduction
1. Background of standard formulation and analysis of technological evolution
Technical Specifications for Corrosion Resistance of Fluororubber Coated Chimneys after Desulfurization are updated mainly to meet the anti-corrosion requirements of chimneys in wet flue gas desulfurization systems in thermal power plants. With the improvement of environmental protection requirements, the flue gas desulfurization (FGD) system is widely used, resulting in increasingly prominent chimney corrosion problems. This standard replaces the old standard of 2015, focusing on the optimization of material properties, construction technology and quality control.
2. Comparison of standard frameworks
Old standard (GB/T 31819—2015) New standard (GB/T 3181-huan-2023) Main changes The definition of terms is relatively brief and does not cover new materials. New and detailed definitions of key terms such as base repair materials and liquid fluororubber surface layer are added. Added adaptability clauses for new materials and clarified technical indicators. The strength requirements of the base layer do not distinguish between different materials. Detailed processing specifications are formulated for brick or concrete and steel structures. Refine the pre-construction pretreatment process to improve construction quality.
3. Implementation suggestions
Case study: A thermal power plant used a modified liquid fluororubber sheet lining system in the desulfurization chimney anti-corrosion project. Detailed base treatment was carried out before construction, including sandblasting and rust removal of steel structures to meet Sa2 grade standards, and surface treatment with corundum to meet roughness requirements. By implementing the temperature rise maintenance requirements in this specification, the flue gas temperature was controlled to be no higher than 80℃ during the first operation, ensuring the stability and durability of the lining.
Recommendations during construction:
- Construct strictly in accordance with the mix ratio provided by the material supplier to avoid poor curing due to improper proportions.
- Strengthen process quality control, especially the thickness and appearance inspection of the elastic structure layer and surface layer containing short fiber filaments.
- Equipped with professional testing equipment, such as thickness gauges and spark leak detectors, to ensure that pinhole defects are discovered and repaired in a timely manner.
GB/T 31819-2023 Referenced Document
- DL/T 5746 Code for acceptance of construction quality of chimney (flue) anti-corrosion engineering in thermal power plants
- DL/T 693 Acid-proof and antiseptic coating used for concrete of chimney
- DL/T 901 Acid-resisting materials of chimney lining for fossil fuel power plant
- GB 50212 Code for construction of building anticorrosive engineering
- GB 50300 Unified standard for constructional quality acceptance of building engineering
- GB 50726 Code for anticorrosive engineering construction of industrial equipment and pipeline
- GB/T 16777-2008 Test methods for building waterproofing coatings
- GB/T 1690 Rubber,vulcanized or thermoplastic.Determination of the effect of liquids
- GB/T 18241.1 Rubber lining—Part 1：Anticorrosion lining for equipment
- GB/T 19250 Polyurethane waterproofing coating
- GB/T 23445 Polymer-modified cement compounds for waterproofing membrane
- GB/T 3512 Rubber, vulcanized or thermoplastic.Accelerated ageing and heat resistance tests.Air-oven method
- GB/T 45001 Occupational health and safety management systems—Requirements with guidance for use
- GB/T 50046 Anti-corrosion design standards for industrial buildings
- GB/T 50224 Construction quality acceptance criteria for building anti-corrosion engineering
- GB/T 50315 Technical standard for site testing of masonry engineering
- GB/T 528 Rubber,vulcanized or thermoplastic.Determination of tensile stress-strain properties
- GB/T 7124 Adhesives.Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies
- GB/T 7760 Rubber,vulcanized or thermoplastic--Determination of adhesion to a rigid substrate--90 degrees peel method
- GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products.Visual assessment of surface cleanliness.Part 1:Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coa
- GB/T 9266 Determination of scrub resistance of film of architectural paints and coatings
- HG/T 20677 Design code for chemical equipment with rubber lining
- JC/T 554 Asbestos rubber latex beater jointing
- JC/T 935 Glass marble for glassfiber production
- JGJ 59 Construction Safety Inspection Standards
GB/T 31819-2023 history
- 2023 GB/T 31819-2023 Technical Specifications for Chimney Corrosion Resistance after Liquid Fluorine Rubber Coating and Desulfurization
- 2015 GB/T 31819-2015 Anti-corrosion technical specification for liquid fluorubber coated FGD chimney