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Stable temperature compensation measurement method for guided wave radar liquid level meter

A guided wave radar and temperature compensation technology, applied in the field of instrument calibration, can solve problems such as measurement liquid level fluctuations and measurement errors

Active Publication Date: 2021-03-19
CNNC FUJIAN FUQING NUCLEAR POWER
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Problems solved by technology

This measurement compensation method affects the function of the steam compensation section when the system pressure, steam parameters and other working conditions change, resulting in measurement errors and eventually resulting in fluctuations in the measurement liquid level

Method used

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  • Stable temperature compensation measurement method for guided wave radar liquid level meter
  • Stable temperature compensation measurement method for guided wave radar liquid level meter
  • Stable temperature compensation measurement method for guided wave radar liquid level meter

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The guided wave radar level gauge is a level sensor with a coaxial measuring probe for continuous level and separation layer measurement in liquids at temperatures up to 450°C. The measurement principle is as follows: High-frequency microwave pulses run along a steel cable or rod, and are reflected back after touching the surface of the medium. After the microwave running time is analyzed and processed by the instrument, the liquid level value is output.

[0031] The reason and principle of automatic steam compensation for guided wave radar level gauge: The propagation speed of electromagnetic wave pulses in different media is different. Because the steam in the tank will affect the speed of electromagnetic waves during the measurement process, it is necessary to calculate the influence of steam on the propagation speed , and finally g...

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Abstract

The invention provides a stable temperature compensation measurement method for a guided wave radar liquid level meter. The method comprises the following steps of: closing a steam compensation function in the instrument function of the guided wave radar liquid level meter, connecting the liquid level measured by the guided wave radar liquid level meter after the steam compensation function is closed to an I / O (Input / Output) acquisition card of a DCS, and sending data to the DCS; designing temperature compensation logic in the first layer of the DCS, taking a temperature signal value as an on-site secondary drain tank thermometer, obtaining a temperature signal through connection of the I / O card of the DCS, and obtaining a final liquid level value after a compensation liquid level value calculated by the logic and a measurement value of the liquid level of the guided wave radar are calculated. According to the invention, the guided wave radar liquid level meter can avoid liquid level fluctuation in unit starting and stopping or large-amplitude power increasing and decreasing activities, and the risks of damage to steam turbine equipment and shutdown and shutdown of a reactor are reduced.

Description

technical field [0001] The method belongs to the technical field of instrument calibration, and in particular relates to a stable temperature compensation measurement method for a guided wave radar liquid level gauge. Background technique [0002] The instrument control professional needs to escort the unit when the unit is started or stopped or the power is greatly increased. It is found that the guided wave radar level gauge of the secondary reheat drain tank of the GSS system will fluctuate greatly during the above activities, which seriously threatens the safety of the unit. , It may cause the isolation of the steam-water separation secondary reheater, resulting in power reduction, and may cause shutdown in severe cases. The existing guided wave radar liquid level gauge measurement compensation method is to perform liquid level measurement compensation through the steam compensation function section that comes with the instrument. This measurement compensation method af...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/284G01F23/00
CPCG01F23/284G01F23/804
Inventor 李海涛孙俊肖付伟阎文琳吴松林陈湛杨肖彦梅杨雅寒高鑫浩
Owner CNNC FUJIAN FUQING NUCLEAR POWER
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