Method and device for evaluating outlet temperature optimization and energy-saving effects of coal mills

Abstract

The invention discloses a method and device for evaluating outlet temperature optimization and energy-saving effects of coal mills. The method comprises the following steps of: obtaining a heat balance equation; obtaining a relational expression between inlet air temperature change and outlet air temperature change of a coal mill according to the heat balance equation; obtaining a hot primary air increase proportion caused by outlet temperature promotion of the coal mill; obtaining a proportion of a hot primary air volume in a total primary air volume under any operation condition of a unit; and obtaining smoke discharging temperature reduction numerical value, at the outlet of an air-pre-heater, caused by temperature rise of the coal mill according to preset data of typical working conditions of the unit, so as to obtain energy-saving evaluation. According to the method, real-time fitting calculation can be carried out on the specific effect of the influences, on boiler thermal efficiency, of economic working-condition operation of the coal mill, so that the energy-saving effect can be intuitively fed back to the operation personnel, convenience is brought to the statistical management of economic and technological indexes, and simplicity and convenience are provided.

Description

technical field [0001] The invention relates to the technical field of coal pulverizers, in particular to a method and device for evaluating the energy-saving effect of coal pulverizer outlet temperature optimization. Background technique [0002] In related technologies, the direct blowing medium-speed coal mill is already a typical configuration of large-scale thermal power plants. Due to the good flow characteristics and internal structure of the medium-speed coal mill, dangerous conditions such as fire and explosion are very rare, but it is clearly given at present The coal mill outlet temperature operation control guideline value leads to limit it at a lower level to prevent coal mill explosion accidents. [0003] However, the judgment conditions of the above-mentioned mill outlet temperature limit are relatively rough, and the understanding of the dangerous working conditions of the pulverization system is insufficient, which not only limits the economical operation of...

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Problems solved by technology

[0002] In related technologies, the direct blowing medium-speed coal mill is already a typical configuration of large-scale thermal power plants. Due to the good flow characteristics and internal structure of the medium-speed coal mill, dangerous conditions such as fire and explosion are very rare, but it is clearly given at present Coal mill outlet temperature operation control guidance value, resulting in limiting it to a lower level to prevent coal mill explosion accidents

[0003] However, the conditions for judging the temperature limit of the above-mentioned mill outlet are relatively rough, and the understanding of the dangerous working conditions of the pulverizing system is insufficient, which not only limits the economical operation of the coal mill, but also fails to fully guarantee the safety of the coal mill

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