Series-connection, double-axial and efficient pulverized coal sorting device

Abstract

The invention provides a series-connection, double-axial and efficient pulverized coal sorting device. The device is that an inner barrel body is arranged between a housing and an inner cone; a channel communicated with a primary air duct is divided into a sorting channel and a pulverized coal returning channel; an upper-stage baffle and a lower-stage baffle are arranged in one cycle in the sorting channel; the opening degrees of the upper-stage baffle and the lower-stage baffle can be adjusted to adjust the fineness of pulverized coal; a pulverized coal returning channel inlet is arranged between the upper end of the inner barrel body and a cover plate; a pulverized coal returning quantity control device is fixedly arranged in one circle in the pulverized coal returning channel; a plurality of pulverized coal returning pipes are arranged between the lower end of the inner barrel body and the housing; the parts in which the end parts of the pulverized coal returning tubes are connected with the inner cone are arranged below a cone cap; returned pulverized coal falls into a coal pulverizing machine through the pulverized coal retuning channel and the pulverized coal returning tubes to be pulverized again. According to the device, the centrifugal sorting characteristic is fully utilized; the pulverized coal returning channel is arranged at the outside of the sorting channel; the unqualified pulverized coal after centrifugal sorting can be thrown into the pulverized coal returning channel and then fall into the coal pulverizing machine through the pulverized coal returning tubes. The device is simple in structure, small in resistance, and high in pulverized coal uniformity indexes and sorting efficiency.

Description

technical field [0001] The invention relates to a pulverized coal separation machine, in particular to a series biaxial high-efficiency powder separation device. Background technique [0002] In recent years, due to changes in the coal market price, the quality of coal used by boilers in thermal power plants is not only far from the designed coal quality, but also changes frequently, resulting in the amount of coal fired by boilers with the same load fluctuating from time to time, which in turn causes the pulverization system to fail. The output is seriously insufficient, and the fineness of pulverized coal becomes coarser, which seriously affects the safety and economy of the operation of pulverized coal boilers in power plants. In order to increase the output of the pulverizing system and reduce the unit consumption of pulverized coal in the steel ball mill, various pulverized coal separation technologies have emerged as the times require. Among various coal powder separa...

AI Technical Summary

Problems solved by technology

However, when the quality of the ground coal deteriorates, the finer the fineness of the coal powder, the greater the circulation rate, the lower the separation efficiency, and the increased resistance of the dynamic separator. These problems limit the development of dynamic separation technology.

[0003] Due to the large fluctuations in the coal quality used by power plant boilers, the fuel consumption of the boilers fluctuates greatly under the same load, resulting in a large output of the pulverization system, resulting in large fluctuations in coal fineness, which ultimately affects the combustion stability and economy of the boiler.

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