Medium-storage ultra-fine pulverized coal preparation system in steel ball mill

Abstract

The invention provides a storage type superfine pulverized coal preparation system in a steel ball coal mill, wherein raw coal (2) enters the ball coal mill (5) after passing through a coal feeder (3) and a drying pipe (4) from a raw coal bunker (1), the pulverized coal ground by the ball coal mill (5) is sorted by a dynamic pulverized coal sorting device (6), the qualified pulverized coal is transported into a pulverized coal bunker (20) to be stored, the returned powder sorted by the dynamic pulverized coal sorting device (6) is communicated with a returned powder grinding device (9) or the drying pipe (4) through a returned powder flow guider (8), and an outlet of the returned powder grinding device (9) is communicated with an inlet of the dynamic pulverized coal sorting device (6). After the storage type superfine pulverized coal preparation system is used, the adaptability of the burning of a boiler to the type of coal can be improved, the unit consumption of the pulverized coal preparation can be greatly reduced, the first-class ash rate of the pulverized coal can be improved, the inflammable goods content of fly ash can be reduced, and the boiler efficiency can be improved. The storage type superfine pulverized coal preparation system is further applicable to the improvement and the design of a self-supply power plant coal fired boiler in the industries of cement, metallurgy, petrifaction and the like.

Description

technical field [0001] The invention relates to an ultrafine coal powder preparation technology, in particular to a storage type ultrafine coal powder preparation system in a coal mill. Background technique [0002] With the continuous development of the economy and the continuous improvement of living standards, the requirements of human beings for the living environment are also increasing. Therefore, it is necessary to continuously improve technology to meet the requirements of human beings for the living environment. The combustion of power plant boilers produces a large amount of nitrogen oxides, which seriously pollutes the living environment. [0003] Steel ball coal mills are widely used by power station boilers because they are suitable for a wide range of coal types. For lean coal and anthracite coal, the mid-storage pulverization system uses hot air to feed pulverizers, and double-inlet and double-outlet coal mills can also be used for direct-blown system. Powder...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to further reduce the pulverized coal fineness of the storage type pulverizing system in the coal mill, improve the adaptability of boiler combustion to coal types, reduce the carbon content of fly ash combustibles, and improve boiler efficiency; The output of the pulverization system can reduce the unit consumption of pulverization and the power consumption rate of the factory. The present invention partially transforms the storage type pulverization system of the existing coal mill to achieve a large reduction in the fineness of coal pulverization while maintaining the pulverization of the coal pulverization mechanism. The output of the system remains unchanged, or when the output of the pulverizing system is greatly increased, the fineness of the pulverized coal remains unchanged, the nitrogen oxides produced by the combustion in the furnace are further reduced, and the ultra-low emission of nitrogen oxides in the combustion of the power plant boiler is realized. Provide a storage type ultra-fine coal powder preparation system in a coal mill,

Images