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Microwave sensor used for detecting steam humidity

A technology of microwave sensor and steam humidity, which is applied in the direction of using microwave to test moisture content, etc., can solve the problems of small optical measurement window, large non-uniformity of secondary water droplet distribution, measurement error and other problems, and achieve simplified measurement device and simple structure , the effect of high quality factor

Inactive Publication Date: 2008-05-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Even if the secondary water droplet can be measured, due to the small optical measurement window and the large inhomogeneity of the secondary water droplet distribution, there may be large errors in the measurement results due to sampling deviation
[0010] In short, the existing steam humidity measurement methods and their measurement devices have serious deficiencies. Design a steam humidity sensor with simple structure, strong environmental adaptability, low manufacturing cost, and excellent performance to detect steam humidity and improve the performance of steam turbines. It is very necessary for safety and economy

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  • Microwave sensor used for detecting steam humidity
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Embodiment Construction

[0030] The change of the dielectric constant of the medium in the microwave resonator will cause the change of the resonant frequency of the resonant cavity. By measuring the change of the resonant frequency of the resonant cavity, the dielectric constant of the medium in the resonant cavity or its variation can be measured. Under a certain pressure (temperature), the humidity of the wet steam is different and the dielectric constant is different, and the two correspond to each other. Therefore, the humidity of the wet steam can be detected by measuring the dielectric constant of the wet steam in the microwave resonator cavity.

[0031] The use of microwave resonant cavity to measure steam humidity is realized by measuring the change of resonant frequency of the resonant cavity when the two-phase flow of wet steam flows through the microwave resonant cavity. In order to make the measurement have high accuracy and precision, it is used to detect wet steam The microwave resonant ...

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Abstract

A microwave sensor used for steam humidity detection belongs to the technical field of testing and is used to solve the problem of steam humidity detection. The technical solution is that it includes a cylindrical cavity with openings at both ends and a microwave signal transmission interface in the middle, and a ring divider is respectively arranged at both ends of the cylindrical cavity, and the ring divider is composed of It consists of 1 to 4 cylinders coaxial with the cylindrical cavity, one end of which is close to the port of the cylindrical cavity is connected with the cylindrical cavity, and the expansion coefficient of the ring separator is larger than that of the cylindrical cavity. The invention has the advantages of simple structure, convenient use and low requirements on the environment, and can realize high-precision online measurement of the humidity of flowing wet steam by cooperating with the microwave signal processing circuit.

Description

technical field [0001] The invention relates to a steam humidity sensor which can accurately detect the steam humidity on-line and belongs to the technical field of testing. Background technique [0002] Steam humidity has an important impact on the safety performance and economical performance of the steam turbine, so it is necessary to monitor the humidity of the steam turbine exhaust on-line. The existing steam humidity measurement methods are mainly divided into two categories, namely thermodynamic method and optical method. Among them, the thermodynamic method is divided into throttling method, condensation method, steam-air mixing method and heating method. The monitoring mechanism and advantages and disadvantages of each method are as follows: [0003] The principle of the throttling method is to throttle the extracted sample to a lower pressure, so that the steam after throttling is in a superheated state, and calculate the humidity value of the extracted sample ste...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04
Inventor 韩中合钱江波张淑娥杨再旺
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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