Transmitting/receiving device for misplaced 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, which is positioned in a staggered way. The measuring system comprises a coal transmission pipe, and the transmitter and the receiver 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 that is transmitted by the transmitter and the flowing direction of the pulverized coal in the coal transmission pipe to form an offset angle between 30 and 60 degrees. The transceiver of the microwave measuring system adds a measuring travel, completely utilizes the Doppler Effect, enlarges the microwave absorptive attenuating action of the pulverized coal, and consequently increases the measured voltage difference, avoids the problems of the reflection measurement, 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 transceiver of a power plant boiler pulverized coal concentration microwave measurement system placed in a misplaced position. Two background technology [0002] Misplaced power plant boiler pulverized coal concentration The transceiver of the microwave measurement system generally uses a horn antenna (or probe) as a signal transmitting and receiving device, and its different placement methods will make the measurement results of the microwave system vary greatly. At present, there are two commonly used placement methods for probes and horn antennas: (1) placed on both sides of the coal pipeline, and the microwave signal is received perpendicular to the direction of coal powder flow in the pipeline; (2) placed on the same side of the coal pipeline , the microwave signal is received after several reflections from the tube wall. There are certain problems in the online...

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Problems solved by technology

However, since the coal delivery pipe is a round pipe, when the microwave is reflected on the pipe wall, a large part of the microwave signal will be reflected to other directions and cannot be received by the receiving device, which will also cause the voltage value before and after attenuation to change. Therefore, the voltage difference measured by the system is not only caused by the absorption and attenuation of microwave by the pulverized coal in the pipe, but also caused by the reflection of a part of the microwave signal, so the measured voltage difference cannot be used to determine the coal powder concentration value

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