Vertical roll mill air-distribution process for adjusting cement particle gradation, and device for achieving process

Abstract

The invention discloses a vertical roll mill air-distribution process for adjusting cement particle gradation. According to the air-distribution process, the air amount needed by a vertical roll mill is distributed into a large part and a small part; the large part is guided in a milling area from the lower part of the vertical roll mill and used for lifting and drying materials in the milling area; the small part is guided in the lower part of a powder selection machine from the upper part of a middle shell of the vertical roll mill, and used for conveying milled materials into the powder selection machine in an air-swept manner with gas guided from the lower part of the vertical roll mill so as to supplement air for powder selection. The invention further discloses a device for achieving the process. According to the air-distribution process and device for achieving the process, disclosed by the invention, the air passing amount at a milling disc is reduced in a manner of distributing the air amount needed by the vertical roll mill into a part below the milling disc and a part above the middle shell, and the air is supplemented for the powder selection machine on the upper part of the middle shell; through reasonable matching, on one hand, the circulating load and the resistance of the vertical roll mill can be reduced, the power consumption of the mill can be decreased, and the efficiency of the vertical roll mill can be increased, on the other hand, the finished cement particle gradation can be adjusted, and the cement performance can be improved.

Description

technical field [0001] The invention relates to a vertical roller mill air supply process and device, in particular to a vertical roller mill air distribution process and device for adjusting and improving cement particle gradation. Background technique [0002] The cement industry is a large energy-consuming industry. The unit power consumption of cement is about 80-100kWh / t, of which the power consumption of cement clinker grinding accounts for a large part. Therefore, reducing the power consumption of cement clinker grinding is environmentally friendly and clean production. important content. [0003] The vertical roller mill is a machine that grinds materials through relatively moving rollers and discs based on the principle of material bed grinding. The vertical roller mill integrates grinding, drying, and powder selection processes, and has the characteristics of high grinding efficiency and simple system process. At the same time, it has a very obvious effect of sav...

AI Technical Summary

Problems solved by technology

Generally, the air volume required for lifting and drying in the grinding area of ​​the vertical roller mill is smaller than that required by the powder classifier. In order to meet the powder concentration requirements of the powder classifier, the air volume for powder selection is also introduced from the lower part of the millstone air ring, because the air volume passing through is large. , resulting in low grinding efficiency of the vertical roller mill, large cycle load of the vertical roller mill, large resistance of the vertical roller mill, and high power consumption

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