A high-efficiency separation device for pulverized coal in a coal mill

Abstract

The invention discloses an efficient coal powder separation device of a coal mill, comprising a spraying pipe device and further comprising a bent pipe, a connecting pipe, an elbow, a movable joint, an adjusting valve, a pressure meter, a flow meter, a fixed plate, grinding rollers, a nozzle, an air guide ring and an air hole, wherein the nozzle is arranged at a far end of the spraying pipe device and the air guiding ring is arranged rightly below the top of the inner part of the nozzle; a plurality of air holes are arranged on a spraying pipe at the inner side of the nozzle; air introduced from a sealing fan is sprayed out at a high speed by a pipeline of the spraying pipe device through the air hole and the nozzle of the spraying pipe device; the spraying pipe device passes through the two grinding rollers; the nozzle is aligned to a coal dropping pipe above a grinding disc; the spraying pipe device is used for fixing the fixed plate into a shell of the coal mill; and the pipeline of the spraying pipe device is provided with an adjusting valve, a pressure meter and a flow meter. According to the efficient coal powder separation device of the coal mill, the air can be introduced from the sealing fan to convey grinded fine coal powder in time; and meanwhile, the coal powder is dried, the problems that the force of the traditional coal mill is not enough and the efficiency is low are solved, and the efficient coal powder separation device is more energy-saving and practical.

Description

technical field [0001] The invention relates to a high-efficiency pulverized coal separation device (nozzle device), in particular to a high-efficiency pulverized coal separation device for a coal mill. Background technique [0002] When the coal mill grinds coal powder, the raw coal enters the coal mill from the coal drop pipe and falls onto the grinding table, and is crushed into powder by the extrusion of the rotating grinding table and the self-propelled grinding roller. Smaller and lighter particles are continuously blown up from the grinding disc by the hot air delivered by the primary fan. After the primary and secondary separation, the heavier coal particles return to the grinding area of ​​the grinding table through the inner cone, and the ground coal powder is introduced into the furnace through the pulverized coal pipe for combustion. [0003] During the grinding process, coal and coal powder are always mixed together, and there is a phenomenon that the ground co...

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Problems solved by technology

[0003] During the grinding process, coal and coal powder are always mixed together, and there is a phenomenon that the ground coal powder is repeatedly ground, which not only consumes more useless work, but also affects the grinding effect of coarse coal.

At the same time, the coal coming out of the coal falling pipe falls on the grinding table and moves outward to the hot air nozzle. Before being blown up by the hot air, there is no air flow during the grinding process in this area to dry and reduce the small particles in the raw coal. The pulverized coal and the pulverized coal that have been ground are transported away in time; therefore, repeated useless work occurs, which eventually leads to insufficient output of the coal pulverizer, reduced work efficiency, and high energy consumption of the motor

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