Deformation Analysis and Treatment Strategy of Platen Heating Surface of CFB Boiler
In order to grasp the cause of the deformation of the platen heating surface of the CFB boiler and solve the problem of leakage of the heating surface caused by the deformation,the structural characteristics of the equipment,the flow characteristics of the working fluid and the effect of heat transfer are discussed and analysed.Combined with the deformation of the screen heating surface existing in the domestic CFB boiler,it is found that the uneven working medium flow,the mismatch between working medium flow and heat load,and the difference of heat transfer effect are the main reasons for the large thermal deviation of the platen heating surface,which further induces the stress deviation of the platen heating sur-face,resulting in the deformation of the tube platen,and the blocked vertical expansion of the platen heating surface will also lead to the irreversible deformation of the tube platen.This paper puts forward the transformation measures of"pipe cutting + split screen + diameter expansion"of the platen heating surface to reduce the thermal deviation of the small platen,and the expansion transformation measures of"double hanger + seal improvement"to realize the free expansion of the platen,and puts forward the operation control technical measures in the start-up stage of CFB boiler from the perspective of operation management,so as to reduce the wall temperature deviation and thermal stress of the platen heating surface at this stage.The deformation treatment measures of the CFB type boiler's platen heating surface have achieved good practice and transformation effect,which can effectively solve the serious deformation problem of the screen heating surface,and is universally popularized.
国家科技期刊平台
NSTL
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