The Structural Design Discussion of Desulfurization Anti-corrosion Flue Gas Duct
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摘要: [目的] 在湿法脱硫工艺设计中,脱硫防腐烟道的结构设计一直是一个难点。 [方法] 用于指导电力行业烟风道设计的标准《火力发电厂烟风煤粉管道设计技术规程》(DL/T 5121—2000)及其配套计算方法并未区分防腐烟道与常规烟道的设计差异,且规程上的较大的型钢加固肋组合截面特性表只给出了槽钢([8~［22a)和工字钢(I10~I28a)的加固肋组合截面特性参数,在脱硫烟道设计中限制了加固肋型钢的使用规格。 [结果] 结合工程设计实践经验,根据防腐烟道面板的允许变形量修改了脱硫防腐烟道加固肋间距的刚度计算公式。 [结论] 提出了脱硫防腐烟道内撑杆十字撑和三角撑的设计细节,以减少内撑杆防腐施工的难度。同时提出了加固肋组合截面特性参数拓展的简易方法,可为脱硫防腐烟道的设计提供一定的参考。Abstract: [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.
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Key words:
- desulfurization anti-corrosion flue gas duct /
- inner brace /
- stiffener
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