A method for inspecting particle size distribution of pulverized coal

Abstract

The invention discloses a method for inspecting the pulverized coal particle size distribution. According to the method, the pulverized coal particle size distribution is expressed by using a power function, pulverized coal which is pulverized by coal pulverizers is screened according to particle size industrial analysis, a mesh number is converted into particle diameter mu m, and the percent content of different particle diameters is measured; the measured percent content of the different particle diameters is introduced to an equation of the power function, so as to determine a and b, and then drawing is performed by using the particle diameter as an X axis and the mass fraction as a Y axis, so that whether the particle size of the pulverized coal which is pulverized by the coal pulverizers is stable can be determined according to the relationship between a and b. According to the method for inspecting the pulverized coal particle size distribution, a and b values in the corresponding equation of the particle size distribution are different for different coal pulverizers, but a certain function relationship exists, and whether the a and b values which are calculated according to products pulverized by the coal pulverizers conform to the function relationship is determined, so as to express the pulverized coal particle size and determine the stability of the pulverized coal which is pulverized by the coal pulverizers.

Description

Technical field: [0001] The invention relates to the technical field of coal powder preparation, in particular to a method for inspecting the particle size distribution of coal powder. Background technique: [0002] Coal powder is composed of various particles of different sizes and shapes. The maximum diameter of anthracite pulverized coal particles used in pulverized coal furnaces is 250-300 μm, and most of them are 20-50 μm; It is related to the method of grinding coal. Coal particle size characteristics are important physical parameters for coal quality analysis and combustion system design. In the process of coal pulverization, it is necessary to study the particle size characteristics of coal and the distribution of ash, sulfur and minerals in each particle size, so that the coal system will not fail to meet the requirements or produce over-grinding in the process of coal pulverization , so as to achieve the purpose of pulverized coal quality improvement and energy ...

AI Technical Summary

Problems solved by technology

The particle size of the first-stage grinding product of the coal mill generally conforms to the Rosin-Rammler distribution, and the bimodal distribution and multi-modal distribution require two or more stages of grinding and require precise process coordination and control, which will increase the complexity of the process control of the grinding equipment , difficulties, thus increasing the cost of pulverized coal

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