GB/T 31819-2023 "Technical Specification for Corrosion-Resistant Operation of Chimneys with Liquid Fluororubber Coating After Desulfurization" applies to the corrosion-resistant lining operation for the inner surfaces of new or existing reinforced concrete chimneys, steel chimneys, brick chimneys, and other flue gas exhaust stacks in thermal power plants after wet desulfurization. It specifies the operational requirements for the liquid fluororubber lining structural system (Type A) and the modified liquid fluororubber sheet lining structural system (Type B), covering key aspects such as substrate treatment, fluororubber lining operation, operational safety, material specifications, and project acceptance. The standard details treatment criteria for substrates of different materials, including surface roughness requirements for steel structures and construction environmental conditions. It also clarifies the mixing ratios of supporting materials, the workflow for lining structure operations, as well as key points for post-construction curing and quality control.