Test control unit of milling system of ball mill

Abstract

A measuring and controlling unit for the ball grinder's pulverizing system, which consists of coal feeder, ball grinder, cold air and hot air barrier plates for cold air and hot air pipes, flapper, coarse powder-fine powder separator, and powder discharger, has temp sensor on outlet pipe of ball grinder, powder quantity sensor on the outlet pipe of finished coal powder, and air flow sensor on the pipeline between fine powder separator and powder discharger. The sensed signals are output to computer for controlling the cold air and hot air barrier plates, coal feeder and total air flow barrier plate.

Description

technical field [0001] The invention relates to the technical field of control, and relates to a measurement and control device for a pulverization system of a ball mill, in particular to a measurement and control device for a thermal power plant to make raw coal into pulverized coal through a ball mill. Background technique [0002] In thermal power plants, ball mills are usually used to grind raw coal into coal powder with qualified particle size. The process of the existing ball mill pulverization system is as follows: the coal feeder controls the amount of raw coal entering the ball mill, the raw coal is mixed with the wind with appropriate temperature and flow rate in the ball mill, and the raw coal is ground by the steel balls in the ball mill. The wind acts as a desiccant and a transport carrier in the ball mill. The coal powder is carried by the wind into the coarse powder separator, and the unqualified coarse powder separated from the coarse powder separator is ret...

AI Technical Summary

Problems solved by technology

The traditional measurement and control devices for the coal load, ventilation rate and air temperature of the ball mill are all measured around the ball mill. The air volume is represented by the inlet pressure of the ball mill, and the air temperature is represented by the outlet temperature value of the ball mill. Pressure, current of ball mill motor, vibration of ball mill bearing, sound of ball mill, ratio of differential pressure of ball mill to differential pressure of precipitator, etc. to characterize the coal loading capacity. Since coal loading is obtained by indirect measurement parameters, it is inevitable Affected by other variables, such as: the method of measuring differential pressure is bound to be disturbed by the air volume; the method of measuring current is bound to be disturbed by the amount of balls loaded in the ball mill; the signal of the method of measuring bearing vibration is less sensitive at high loads; Similar; but the ratio method of measuring the differential pressure of the ball mill and the differential pressure of the dust collector cannot guarantee that the coal loading is at the optimum value

Finally, all the above-mentioned schemes will cause large changes in the signal under different working conditions, such as the moisture content of the raw coal, the amount of balls loaded in the ball mill, and the wear of the steel balls after a period of operation. Low precision, inconvenient control, inaccurate control, etc.

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