On the basis of analysing the structure and the heat transfer property for spiral finned tube bundle

the problems existing in design and operation of the spiral finned tube economizer have been pointed out based on the practical operation situation of the said economizer. It is considered from analysis that

in order to realize optimal design of the heating surface for the spiral finned tube bundle

it is necessary to have a clear understanding of the following issues: heat transfer and resistance behavior of the said bundle; the law governing variation of tube bundle wearout and ash deposition state; as well as the influence of heating surface’s ash deposition upon heat transfer and resistance of the tube bundle.