Device for monitoring coal position of coal mill through multiquadrant noise method

Abstract

The invention aims at providing a device for monitoring coal position of a coal mill through a multiquadrant noise method. The device comprises the coal mill, 4N*(N ranges from 1 to 4) piezoelectric ceramic pick-ups mounted at the outside of a steel barrel of the coal mill, and an external processor, wherein the peripheral sidewall of the steel barrel of the coal mill is quartered into four quadrant areas by treating an axis of the steel barrel of the coal mill as the center; N*(N ranges from 1 to 4) piezoelectric ceramic pick-ups are uniformly adhered in each quadrant area; an inclinometer is mounted on each piezoelectric ceramic pick-up; the external processor is connected with each piezoelectric ceramic pick-up and used for reading and recording an electric signal output by each piezoelectric ceramic pick-up in order to determine the coal position of the coal mill.

Description

technical field [0001] The invention relates to the field of combustion regulation or control, in particular to a device for monitoring the coal level of a coal mill by adopting a multi-quadrant noise method. Background technique [0002] About 60% of the country's power plant boilers are equipped with pulverizing systems, which use intermediate storage bin-type pulverizing equipment and steel ball mills. Due to the huge coal consumption of power station boilers, up to hundreds of tons per hour, in order to reduce the power consumption per unit of pulverization, the steel ball coal mill is required to maintain the maximum coal storage capacity (that is, the coal volume under the maximum output), and at the same time Ensure that the pulverizer produces the most qualified pulverized coal per unit time. The coal storage of the device for monitoring the coal level of the coal mill mainly adopts the resistance method, that is, the pressure difference between the inlet and the ou...

AI Technical Summary

Problems solved by technology

Because the coal mill is very noisy when it is running, multiple coal mills arranged on site are likely to interfere with each other. If the amplitude threshold circuit is used to overcome the noise of adjacent coal mills in noise pickup, it will also distort its own signal and affect the accuracy of monitoring. sex

Although many steel ball coal mills adopt closed sound insulation measures to reduce noise pollution, the frequency domain change of single-point monitoring is relatively small, the resolution is not high, and it is difficult to achieve precise control

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