Method for evaluating separation effect of coarse powder separator during mixed coal grinding

Abstract

The invention relates to a method for evaluating the separation effect of a coarse powder separator during mixed coal milling. The method comprises the steps: evaluating the separation effect of the coarse powder separator during mixed coal milling according to the amount of coarse pulverized coal in fine pulverized coal at an outlet of the coarse powder separator before entering the next processor the amount of fine pulverized coal in the coarse pulverized coal returned to a coal mill, wherein before entering the next process, the smaller the amount of the coarse pulverized coal in the finepulverized coal at the outlet of the coarse pulverized coal separator is, the better the separation effect of the coarse pulverized coal separator is; the smaller the amount of the fine pulverized coal in the coarse pulverized coal returned to the coal mill is, the better the separation effect of the coarse pulverized coal separator is. According to the invention, the test time is shortened, and the field coordination workload of the outlet pulverized coal fineness test of the coarse powder separator is reduced; the test boundary conditions are simplified, the test cost is reduced, the changerule of the performance of the coarse powder separator in the transformation or overhaul period can be known, the design, operation and maintenance and transformation work of the power station boilerpulverizing system can be facilitated, and the energy-saving level of the power station boiler pulverizing system can be improved.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a method for evaluating the separation effect of a coarse powder separator during coal blending and grinding. Background technique [0002] In coal-fired power plant boilers burning low-quality coal, the intermediate storage pulverizing system is one of the important equipment of the boiler island. Improving the performance of the pulverizing system is an important direction to improve boiler combustion, reduce boiler unit coal consumption, and improve boiler unit safety. [0003] The major equipment in the mid-storage pulverizing system includes coal mills, coarse powder separators, fine powder separators, and pulverizers, etc. Improving the performance of the above equipment can significantly improve the performance of the pulverizing system. There are many studies on improving the performance of the coal mill body and pulverizer, but there are few litera...

AI Technical Summary

Problems solved by technology

At the present stage, the imported coal type of the coal pulverizer in the power plant may be mixed and ground by two or more types of coal (such as anthracite and lean coal), and the recommended value of the optimal cycle ratio cannot be determined

It also cannot reflect the transformation effect of the coarse powder separator

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