The Structural Design Discussion of Desulfurization Anti-corrosion Flue Gas Duct

[Introduction] The structural design of desulfurization anti-corrosion flue gas duct in wet FGD is always a difficult point. [Method] Technical code for design of thermal power plant air & flue gas ducts/raw coal & pulverized coal piping(DL/T 5121-2000) and the auxiliary calculation method,which is used to guide the design of thermal power plant air & flue gas ducts, make no distinction between desulfurization anti-corrosion flue gas duct and usual flue gas duct design, and for larger stiffener, combined stiffener cross section parameters of ([8~［22a) and (I10~I28a) were only listed in the code, it limited the usage specifications of stiffener. [Result] Combining the engineering fact, this paper revises the rigidity calculation formula of stiffener space according to the plate allow deformation of desulfurization anti-corrosion flue gas duct. [Conclusion] The design detail of cross & triangle inner brace is proposed to reduce the difficulty of anti-corrosive construction. This paper also gives a simple method to expand combined stiffener cross section parameter, thus to provide some reference for the design of desulfurization anti-corrosion flue gas duct.