Coal blocking early warning and automatic processing device and method for medium-speed coal mill

Abstract

The invention discloses a coal blocking early warning and automatic processing device and method for a medium-speed coal mill. The device comprises a first pressure sensor and a flow sensor which are arranged on an inlet pipeline of the coal mill, and a second pressure sensor arranged on an outlet pipeline of the coal mill; the first pressure sensor and the flow sensor are used for collecting the pressure and the flow of an inlet of the coal mill and transmitting the pressure and the flow to a controller; the second pressure sensor is used for collecting the pressure of an outlet of the coal mill and transmitting the pressure to the controller; the controller is connected with an early warning device; the controller is used for comparing the flow and the pressure difference of the inlet and outlet of the coal mill with corresponding threshold values, and if at least one signal is not within a corresponding normal threshold range, a coal blocking signal is output to the early warning device; and the controller is further used for adjusting a hot air adjusting valve to increase the volume of air entering the coal mill or adjusting a cold air adjusting valve to reduce the temperature of the outlet of the coal mill.

Description

technical field [0001] The invention belongs to the field of coal pulverizers, and in particular relates to a medium-speed coal pulverizer coal blocking early warning and automatic processing device and method. Background technique [0002] Coal mills are important auxiliary equipment for power plant boilers. Medium-speed coal mills are widely used due to their advantages of fast start-up and low power consumption for pulverization. However, in the case of poor coal types, especially when the moisture and ash content of the raw coal are large, if the operation is not done properly, it is very easy to cause blockage of the coal mill. Therefore, early warning and timely treatment of coal blockage of the coal mill are very important, otherwise the safety of the unit will be seriously affected. Stable operation. Moreover, if the coal is blocked and cleaned manually, the flying pulverized coal will not only cause environmental pollution, but also cause unexpected expansion of ac...

AI Technical Summary

Problems solved by technology

However, in the case of poor coal types, especially when the moisture and ash content of the raw coal are large, if the operation is not done properly, it is very easy to cause blockage of the coal mill. Therefore, early warning and timely treatment of coal blockage of the coal mill are very important, otherwise the safety of the unit will be seriously affected. Stable operation

Moreover, if the coal is blocked and cleaned manually, the flying pulverized coal will not only cause environmental pollution, but also cause unexpected expansion of accidents. If the system is not completely isolated, hot air entering the coal mill for maintenance will burn the maintenance personnel. , and even cause pulverized coal deflagration

[0003] However, the currently used pulverizer coal blocking signal only relies on the differential pressure signal at the inlet and outlet of the coal pulverizer to remind the operator

Defects of this method: First, it is single and easy to block the pressure measuring point. If there is any bad point at the inlet or outlet, an alarm signal cannot be issued; Judging whether coal is blocked by experience often leads to misjudgments and missed judgments; the third is that the alarm lags behind; the fourth is that even if coal is found, it can only be handled manually, not automatically

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