Coal powder preparation process method based on vertical mill

Abstract

The invention provides a coal powder preparation process method based on a vertical mill. The coal powder preparation process method based on the vertical mill includes the steps that 1) limestone, raw coal and pebble coal are respectively fed into the vertical mill through a quantitative feeding machine; 2 ) a low-oxygen gas external circulation system is arranged on the vertical mill, the limit oxygen content in the low-oxygen gas external circulation system is controlled not to exceed 12%, and ingredients fed into the vertical mill are subject to powder grinding process under the environment of the low-oxygen gas external circulation system; and 3) the coal powder discharged from an explosion-proof cloth bag dust collector enters a storage bin, and then the coal powder discharged from the storage bin is transported in bulk. According to the method, the problems of unordered discharge of the pebble coal and serious pollution in the original process of preparing the coal powder are solved; the low-oxygen gas external circulation system is additionally arranged so that coal powder can be efficiently and cleanly prepared; and the limestone is added so that SO2 generated during combustion of the prepared coal powder can be converted into solid CaSO4, the emission of waste gas can be reduced, and the effect of calcium-based sulfur fixation is realized. The coal powder preparation process method based on the vertical mill has the characteristics of safety, high efficiency, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of coal powder preparation, and in particular relates to a coal powder preparation process method based on a vertical mill. Background technique [0002] The vertical mill integrates the functions of grinding, homogenization, drying, powder selection and conveying. Due to the advantages of simple grinding mechanism, convenient operation and low requirements on materials, vertical mills have been widely used in recent years. [0003] The existing vertical mill pulverization process is: raw coal bunker→vertical mill→coal powder collector→coal powder bin. With this process, only a single type of coal powder can be produced, and in the process of coal powder preparation, there will be disorderly discharge of pebble coal that is difficult to grind, causing environmental pollution. At the same time, the prepared coal powder is easy to burn Generate SO 2 create pollution. At the same time, when pulverized coal ...

AI Technical Summary

Problems solved by technology

With this process, only a single type of coal powder can be produced, and in the process of coal powder preparation, there will be disorderly discharge of pebble coal that is difficult to grind, causing environmental pollution. At the same time, the prepared coal powder is easy to burn Generate SO 2 create pollution

At the same time, when pulverized coal is prepared, it is flammable and explosive, and under storage conditions, pulverized coal will slowly oxidize and heat up, eventually leading to spontaneous combustion. A good control process is required to ensure safety.

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