Method for evaluating influence of air preheater parallel-connection two-section combined economizer on boiler

Abstract

The invention discloses a method for evaluating the influence of an air preheater parallel two-section combined economizer on a boiler. The method comprises a method for evaluating the influence of two-section combined economizer commissioning and ceasing on boiler heat loss, a method for testing the heat exchange efficiency of a two-section combined economizer body, a method for evaluating the air leakage rate change of an air preheater by switching of a two-section combined economizer, and a method for evaluating the boiler exhaust smoke heat loss by the inlet smoke temperature change of a dust removal system in the operation state of the two-section combined economizer. Based on parameters such as boiler fuel and an air-smoke system, the method also selects a proper boiler system heat balance boundary, establishes a mathematical algorithm to carry out theoretical calculation on boiler heat loss and air leakage rate change of the air preheater and evaluate the influence of the two-section combined coal economizer on the performance of the boiler, and proposes a calculation method for the performance of the two-section combined coal economizer body and the influence of the smoke temperature change of the inlet of the dust removal system on the heat loss of the boiler in the commissioning state of the coal economizer, so that the operation optimization control of a coal-fired unit boiler of a transformation type is facilitated.

Description

technical field [0001] The invention relates to an evaluation method for the influence of an air preheater connected in parallel with a two-stage combined economizer on the performance of a boiler system. Background technique [0002] The exhaust gas temperature is one of the important technical and economic indicators in the operation of power plant boilers. The change of the exhaust gas temperature can have a great impact on the economics of the boiler operation. The increase of the exhaust gas temperature will lead to an increase in the heat loss of the exhaust gas and the thermal efficiency of the boiler. reduce. In the daily operation of the boiler, there are many reasons for the increase of the exhaust gas temperature. One type of reason is the high increase of the exhaust gas temperature caused by the measurement deviation, which usually includes dust accumulation of the exhaust gas temperature measuring element, failure and poor representativeness of the measuring po...

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Problems solved by technology

[0004] For such transformed coal-fired units, there is currently no evaluation method for the evaluation of the impact of the two-stage combined economizer on the boiler heat loss and the operation of the air preheater, which lacks scientific calculation basis and is not conducive to evaluation The performance of the economizer body and the influence of the change of the flue gas temperature at the inlet of the dust removal system on the heat loss of the boiler when the economizer is put into operation

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