Coal mill outlet temperature control method

Abstract

The invention relates to a coal mill outlet temperature control method. The coal mill outlet temperature control method comprises the following steps that a temperature value is detected through a temperature measuring part, and the temperature value is transmitted to a controller according to an instruction TE-T0; the controller is used for controlling the opening degrees of a cold air door and a hot air door and the actual coal milling speed of a coal mill according to a preset program method so as to adjust the temperature at the outlet of the coal mill, and when the cold air door and the hot air door do not act according to the instruction of the control part or the temperature cannot be automatically adjusted, the cold air door or the hot air door is forcibly closed through manual control, so that the problem of safety accidents caused by pulverized coal explosion due to spontaneous combustion of a coal pulverizing system possibly caused by over-high temperature of an outlet of the coal mill is solved; or the temperature of an outlet of the coal mill is too low, and coal cannot be dried sufficiently, so that the problems of difficulty in pulverizing, poor flowability of pulverized coal, influence on pulverized coal conveying and even blockage caused by the accumulated pulverized coal are solved; and meanwhile, the real-time and whole-process automatic control of the outlet temperature of the coal mill is realized by combining a method for coordinately adjusting the opening degrees of the cold and hot air doors and the coal milling speed of the coal mill.

Description

technical field [0001] The invention belongs to the field of coal-fired power generation, and in particular relates to a method for controlling the outlet temperature of a coal mill. Background technique [0002] For the operation of the coal mill, the outlet temperature is an important parameter that needs to be controlled in the hot state operation. If the outlet temperature of the coal mill is too high, it will cause spontaneous combustion in the pulverizing system, cause a safety accident caused by the explosion of coal powder, and even cause a fire in the furnace. Negative pressure fluctuates greatly, and the MFT signal is generated to cause the boiler to extinguish fire; the outlet temperature of the coal mill is too low, and the coal will not be dried enough, resulting in difficulties in pulverization, poor fluidity of pulverized coal, affecting pulverized coal transportation, and even causing clogging of pulverized coal , the current operation mainly depends on the r...

AI Technical Summary

Problems solved by technology

[0002] For the operation of the coal mill, the outlet temperature is an important parameter that needs to be controlled in the hot state operation. If the outlet temperature of the coal mill is too high, it will cause spontaneous combustion in the pulverizing system, cause a safety accident caused by the explosion of coal powder, and even cause a fire in the furnace. Negative pressure fluctuates greatly, and the MFT signal is generated to cause the boiler to extinguish the fire; the outlet temperature of the coal mill is too low, and the coal will not be dried enough, resulting in difficulties in pulverization, poor fluidity of pulverized coal, affecting pulverized coal transportation, and even causing clogging of pulverized coal , the current operation mainly depends on the real-time attention and timely adjustment of the operator. In the actual operation process, especially in the process of starting and stopping the coal mill, it is difficult for the operator to take care of it alone. A method is needed to realize the real-time monitoring of the outlet temperature of the coal mill. , Whole process automatic control

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