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

A coarse powder separator and pulverized coal technology, which is applied in the testing of machines/structural components, instruments, particle size analysis, etc., can solve problems such as the inability to reflect the transformation effect of the coarse powder separator, and the inability to determine the recommended value of the optimal cycle rate.

Inactive Publication Date: 2020-09-01
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment Construction

[0052] According to the technical scheme in the summary of the invention, an example is given in combination with the transformation of a certain coarse powder separator.

[0053] A power plant plans to renovate the coarse powder separator of a boiler storage pulverization system, and replace the coarse powder separator with a rotary-inertia coupling coarse powder separator. The performance evaluation work steps of the modification of the coarse powder separator are shown in Figure 1.

[0054] Step 1: Carry out the performance test of the coarse powder separator before modification. At the same time, record the coal quality of the coal mill inlet, the ventilation volume of the pulverizing system, the fineness of coal pulverized in the pulverizing system, the current of the coal mill, the current of the pulverizing fan, and the pressure cooker at the inlet and outlet of each equipment in the pulverizing system.

[0055] Step 2 carried out the modification of the coarse powder ...

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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...

Claims

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Application Information

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IPC IPC(8): G01M99/00G01N15/02
CPCG01M99/008G01N15/02G01N15/0272
Inventor 贾永会马登卿刘文献汪潮洋杜建桥戴喜庆
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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