Gas and liquid two-phase dryness measuring system

Abstract

The invention provides a gas and liquid two-phase dryness measuring system. The gas and liquid two-phase dryness measuring system comprises a gas and liquid two-phase heating furnace, a water injection cutoff valve, a three-phase heating power source, a voltage stabilizing valve, a unidirectional cutoff valve, a temperature transmitter, a pressure transmitter, a multi-layer drum-shaped capacitance sensor, a condensing tank, a data processing unit and the like. The gas and liquid two-phase dryness measuring system has the advantages that the dryness of steam can be accurately detected and measured in real time at high temperature and high pressure; by utilizing an experiment device to test the precise feature structure of the sensor, the system can be widely applied to the fields of real-time detection of steam injection boilers, downhole detection of steam injection wells in stratification testing, and the like.

Description

technical field [0001] The invention relates to the technical field of thermodynamics, in particular to a gas-liquid two-coherence measurement system. Background technique [0002] The multi-layer barrel capacitive sensor has the advantages of simple structure, high resolution, non-contact measurement, and can work under harsh conditions such as high temperature, radiation and strong vibration, and has a fast response. Because the capacitance between objects is closely related to its structural parameters, the detection of the measured object can be realized by changing the physical parameters to change the capacitance between objects, which is the principle of capacitance method measurement. In recent years, the measurement of steam dryness sensor technology based on the capacitance method has been vigorously developed. One of the directions is the application of measurement systems in high temperature and high pressure, difficult measurement and low accuracy. It is used in...

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Problems solved by technology

However, for the flat capacitive sensor structure, the limitations of stability, measurement accuracy, sensitivity, and high temperature and high pressure resistance do not meet the current needs.

[0004] Abroad, British Electric Power Central Laboratory, British GEC Company, University of Hannover in Germany, Swiss BBC Company and American Westinghouse have conducted a lot of research on steam dryness measurement; British Electric Power Central Laboratory MOORE et al. A superheated humidity probe, although the probe improves the utilization rate of heat, but due to the small heating area, the temperature of the heating part is high, resulting in high local steam temperature and the complex structure of the probe, which is difficult to apply actual production

Sunil K.Khijwania of Mississippi State University in the United States developed a U-shaped optical dryness probe, and the University of Stuttgart in Germany developed a new type of micro-optical and pneumatic combined wedge-shaped steam dryness measurement probe based on the principle of optical measurement. Compared with the thermodynamic method, the optical method improves the measurement accuracy, but due to the limitation of the actual available wavelength, it can only measure the water droplets with a smaller diameter in the steam. The optical method has strict requirements on the measurement environment, and the equipment is expensive and economical. poor

Pascal Kronenberg and Pramod K.Rastogi in Switzerland and others have developed a humidity sensor based on the fiber grating method using polyimide material. The sensor has linearity and accuracy, but the fiber grating method has higher requirements for the demodulator, and Not suitable for high temperature and high pressure environment of oil well

Therefore, there is no relevant experimental device for measuring dryness based on the multi-layer cylinder capacitance method at present.

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