The FLUENT6.2 software is adopted for numerical simulating heat transfer and flow characteristic of the gas when it flow through rectangular tube bundles in transverse direction, the array separation of tubes effected to heat transfer and flow is analyzed, the correlation equation of heat transfer characteristic is derived, and bases on the velocity distributing the rational tube arrangement is adopt to optimize economizer. Taking a certain power plant’s 200MW boiler economizer as an example, the porous medium model and heat exchanger model are employed for simulating. The study result indicates that: the heat-exchange performance of the economizer taking variable-pitch tube arrangement is excelled than the primary one, the discrepancy of gas pressure drop of them is narrow. The essay has direct significance for the structure optimizing and increasing heat exchange efficiency of power plant economizer.

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