Transmitting/receiving device for breeze concentration microwave measurement system of power station boiler

Abstract

The invention discloses a transceiver of a microwave measuring system of the pulverized coal concentration of electric station boilers, and the measuring system utilizes the microwave absorption action of the pulverized coal, combines the microwave transmitting device and the microwave receiving device, converts a microwave damped signal into a voltage difference signal, and determines the pulverized coal concentration value by measuring voltage difference; a microwave oscillator, a power separation meter and a transmitter form the transmitting device, the receiving device comprises a measuring signal receiving device and a reference signal receiving device, the measuring signal receiving device comprises a receiver, a first radio detector, a first direct current amplifying circuit and a first low pass filter, the reference signal receiving device comprises a second radio detector, a second direct current amplifying circuit, a second low pass filter and a difference amplifying circuit. The invention avoids the problem existing when adopting the probe measurement, and effectively solves the problem of inconsistent measuring results and can accurately measure the pulverized coal concentration value through the method that measures a voltage difference signal.

Description

a technical field [0001] The invention belongs to multiphase flow measurement technology, in particular to a transceiver device of a microwave measurement system for pulverized coal concentration of a power station boiler. Two background technology [0002] Among the many measurement methods (such as differential pressure method, energy method, optical wave method, capacitance method, etc.) , becoming the most widely used one. For the microwave measurement system, the most widely used one is to use the probe as the signal receiving and transmitting device, and some use the horn antenna as the transmitting and receiving device. However, the measurement systems of these two transceivers have certain limitations and cannot accurately measure the pulverized coal concentration. [0003] When the probe is used as the signal transmitting device, the probe needs to be inserted into the coal delivery pipe, which will seriously affect the measurement, and the pulverized coal concent...

AI Technical Summary

Problems solved by technology

However, the measurement systems of these two transceivers have certain limitations, and cannot accurately measure the concentration of pulverized coal.

[0003] When the probe is used as the signal transmitting device, the probe needs to be inserted into the coal delivery pipe, which will seriously affect the measurement, and the pulverized coal concentration value cannot be accurately measured, because on the one hand, the pulverized coal flow in the coal delivery pipe will wear the probe and affect The measurement results will also cause frequent replacement of the probe; on the other hand, the pulverized coal flow in the pipe will form a flow around the top of the probe, resulting in large fluctuations in the microwave signal transmission through the coal pipe, which will also have a great impact on the measurement

[0004] At present, the microwave system using the horn antenna as the transceiver device has a large difference in the system design; and the processing of the microwave signal is not very reasonable, resulting in a large change in the measurement results even under the same measurement conditions , cannot effectively measure the pulverized coal concentration value

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