Judgment method of ash degree of heating area considering the influence of global heat transfer of coal-fired boilers

Abstract

The invention relates to a method for judging the ash level of a heating area considering the influence of the global heat transfer of a coal-fired boiler. k ; 2) Obtain the change value vector δT of the steam temperature difference between the inlet and outlet of the heating surface k without soot blowing a_k ;3) Correcting the steam temperature difference between the inlet and outlet of other heating surfaces to obtain the corrected value ΔT' of the steam temperature difference between the inlet and outlet k ;4) According to the correction value ΔT' of the steam temperature difference between the inlet and outlet of the heating surface k Calculate the ash degree coefficient β of each heated area k 5) When the ash accumulation degree coefficient of a certain heating surface is greater than the starting threshold, start soot blowing until the ash accumulation degree coefficient decreases below the starting threshold, and complete the soot blowing on the heating surface of the coal-fired boiler. Compared with the prior art, the present invention has the advantages of scientific utility, precision and simplicity.

Description

technical field [0001] The invention relates to the field of detection of coal-fired boilers, in particular to a method for judging the ash degree of the heated area considering the influence of the overall heat transfer of the coal-fired boiler. Background technique [0002] The detection of ash level in the heating area of ​​coal-fired boilers is the basis and premise of optimizing the soot blowing strategy. At present, the judgment of the ash level in the heating area mainly includes the cleaning factor method, the heat transfer effectiveness ratio method, the neural network method, the entropy production analysis method and the export method. However, in practical applications, due to the uncertainty of coal quality, load changes, and the complex energy interaction of metal heat storage and heat exchange systems, the accuracy of the above method for determining the degree of ash accumulation is difficult to guarantee. Contents of the invention [0003] The object of th...

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Problems solved by technology

[0002] The detection of ash level in the heating area of ​​coal-fired boilers is the basis and premise of optimizing the soot blowing strategy. At present, the judgment of the ash level in the heating area mainly includes the cleaning factor method, the heat transfer effectiveness ratio method, the neural network method, the entropy production analysis method and the export method. However, in practical applications, due to the uncertainty of coal quality, load changes, and the complex energy interaction of metal heat storage and heat exchange systems, the accuracy of the above method for determining the degree of ash accumulation is difficult to guarantee.

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