Explosion-proof system for grinding high-volatile-matter coal through double-input and double-output coal grinder and work method

Abstract

The invention relates to an explosion-proof system for grinding high-volatile-matter coal through a double-input and double-output coal grinder and a work method. The explosion-proof system comprisesa raw coal hopper, a coal feeder, the double-input and double-output coal grinder, a pulverized coal separator, a combustor, a boiler, an air preheater, a dust remover, an induced draft fan and a chimney. The raw coal hopper is connected with the coal feeder. The coal feeder is connected with an inlet of the double-input and double-output coal grinder, and an outlet of the double-input and double-output coal grinder is connected with the pulverized coal separator. The pulverized coal separator is connected with the combustor. The combustor is connected with an inlet of the boiler. The air preheater is arranged at an outlet of the boiler and is connected with the dust remover. The dust remover is connected with an inlet of the induced draft fan, and an outlet of the induced draft fan is connected with the chimney. The system further comprises a cold flue gas pipeline and a cold smoke fan, one end of the cold flue gas pipeline is connected with the outlet of the induced draft fan, the other end of the cold flue gas pipeline is connected with an inlet of the cold smoke fan, and an outlet of the cold smoke fan is connected with the inlet of the double-input and double-output coal grinder. By means of the system and the method, the problem that when grinding of the double-input and double-output coal grinder for high-volatile-matter coal is stopped, detonation is prone to happeningcan be solved fundamentally.

Description

technical field [0001] The invention relates to an explosion-proof system and working method for grinding high-volatile coal with a double-inlet and double-outlet coal pulverizer, and belongs to the technical field of explosion-proof coal pulverizers in large-scale coal-fired power plants. Background technique [0002] The use of high volatile coal can effectively improve the stability of boiler combustion, reduce the loss of unburned carbon in dry ash, improve the thermal efficiency of boilers, and reduce the concentration of nitrogen oxides at the outlet of economizers; in recent years, coal-fired power plants Increased the purchase of domestic bituminous coal, Indonesian bituminous coal, and Indonesian lignite and other high-volatile coals; eventually, the volatile content of the coal type in the power plant is higher than that of the designed coal type, which brings pressure to the ball mill pulverization system. a greater security risk. The double-inlet and double-outl...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems existing in the prior art, the present invention provides an explosion-proof system and an explosion-proof working method that can effectively solve the deflagration problem when the double-inlet and double-outlet coal mill grinds high-volatile coal and stops grinding.

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