Microwave measurement system for breeze concentration of power station boiler

Abstract

The invention discloses a microwave measuring system of pulverized coal concentration of an electric station boiler, which comprises a coal transmission pipe and an emitter and a receiver that are arranged at two sides of the coal transmission pipe and positioned along the radial direction in a staggered way, thus leading the transmission direction of a microwave signal emitted by the emitter and the flowing direction of pulverized coals in the coal transmission pipe to form an offset angle; according to the one-to-one correspondence between voltage difference and the pulverized coal concentration in the coal transmission pipe, the emitter and the receiver determine the pulverized coal concentration value corresponding to the pressure difference. The microwave measuring system of the pulverized coal concentration of the electric station boiler leads the emitting and receiving devices to be obliquely arranged at two sides of the coal transmission pipe, and the microwave signal is received by a certain offset angle with the flowing direction of the pulverized coals in the pipe, thus adding a measuring travel, enlarging the absorptive attenuating action of the pulverized coals to the microwave, increasing the measured voltage difference, avoiding the problems of the reflection measurement, and accurately measuring the pulverized coal concentration value; through the method that measures a voltage difference signal, the microwave measuring system of the pulverized coal concentration of the electric station boiler effectively solves the problem of inconsistent measured results and can accurately measure the pulverized coal concentration value.

Description

a technical field [0001] The invention belongs to multiphase flow measurement technology, in particular to a microwave measurement system for power plant boiler pulverized coal concentration. Two background technology [0002] During the operation of the power plant boiler, the uniformity of the primary air of the pulverized coal burner and the amount of pulverized coal (that is, the concentration of pulverized coal) plays an important role in the safe and economical operation of the boiler. Maintaining an appropriate pulverized coal concentration is a necessary condition for establishing a good aerodynamic condition in the furnace and stable combustion. Many scholars at home and abroad have done a lot of research on the measurement of pulverized coal concentration. The existing measurement methods are mainly divided into direct Indirect methods include: resistance pressure difference method, energy method, temperature method, heat balance method; direct methods include: opt...

AI Technical Summary

Problems solved by technology

The primary wind speed in the pipe is relatively high, generally above 15m / s. This high wind speed will continuously sweep the inner wall of the pipe during the process of conveying the pulverized coal, so that the pulverized coal adhering to the wall will not be too much, but Since it is impossible to completely purge away all the coal powder adhering to the pipe wall, the part of coal powder remaining on the pipe wall will affect the microwave measurement and increase the measurement error

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