What are the environmental corrosion factors for flue gas desulfurization equipment? What are the respective impacts?

The environmental corrosion factors of flue gas desulfurization equipment mainly include ambient temperature, the effect of solid materials, and the basic structure of the equipment. I. Ambient temperature: The impact of ambient temperature is a common issue among various flue gas desulfurization devices. However, the equipment used in various processes is exposed to different ambient temperatures. The impact of temperature on equipment linings mainly includes the following 4 aspects. 1. Different materials are chosen depending on the temperature; selecting an inappropriate material can result in significant losses. 2. The lining material and the equipment substrate exhibit different linear expansions under temperature effects, which leads to thermal stresses at the interface between them, affecting the lifespan of the lining. 3. Temperature reduces the physicochemical properties of materials, thereby decreasing the wear resistance and stress resistance of lining materials and accelerating their aging process. 4. Under the influence of temperature, defects such as bubbles and microcracks that form during lining construction are subjected to thermal stress, which creates conditions for medium penetration. II. Effect of solid materials: The impact of solid materials on the equipment is mainly manifested in the fact that these solids, in a slurry form, fall from the top of the tower and wash against the surface of the lining; if the lining is uneven, this will exacerbate wear. III. Equipment substrate structure: The impact of the substrate structure on waste gas treatment equipment arises mainly from the fact that flue gas desulfurization equipment is mostly of flat-plate welded structure. To ensure the quality of corrosion protection of the lining, certain requirements regarding installation and welding must be taken into account during design, on-site fabrication, and installation, in order to avoid compromising the equipment’s corrosion resistance.