Gas-water two phase flow multiparameter measuring method and device

Abstract

The invention discloses a gas-water two phase flow multiparameter measuring method and a device thereof, wherein the device comprises a measuring pipe, a throttling element, a differential pressure transmitter, an array conductivity sensor, a pressure transmitter, a temperature transmitter, a conductivity measuring and collecting circuit, a data acquisition circuit and a computer; the array conductivity sensor is connected with the computer through the conductivity measuring and collecting circuit; and each transmitter is connected with the computer through the data acquisition circuit. According to the differential pressure obtained by the throttling element, the conductivity signal obtained by the array conductivity sensor, the pressure obtained by the pressure transmitter, and the temperature obtained by the temperature transmitter, a plurality of parameters such as flow pattern, void ratio, dryness, flow rate and the like of the gas-water two phase flow are obtained. In the measurement, according to the flow pattern judgement result, a corresponding measurement model or relational expression under the flow pattern is selected to calculate the void ratio, dryness and flow rate. The invention has simple structure, small loss of pressure, high reliability, low cost and wide range of application, and can be applied to the gas-water two phase flow measurement in the fields of energy, power, chemical engineering and the like.

Description

technical field [0001] The invention belongs to the technical field of metering, and in particular relates to a multi-parameter measurement method and device for gas-water two-phase flow based on a throttling element and an array type conductance sensor. Background technique [0002] Gas-water two-phase flow exists widely in energy, power, chemical and other industrial fields. The online real-time measurement of parameters such as flow pattern, void fraction, dryness (mass air fraction) and flow has long been a difficult problem in the field of detection and measurement. . Although there are many methods for measuring various parameters of gas-liquid two-phase flow, it is still difficult to meet the online measurement requirements of actual industrial sites due to the complexity of the two-phase flow system. Since the conductance signal of two-phase flow can represent the information of its phase holdup and phase distribution, the application of conductance sensor in the fi...

AI Technical Summary

Problems solved by technology

Although there are many methods for measuring various parameters of gas-liquid two-phase flow, it is still difficult to meet the online measurement requirements of actual industrial sites due to the complexity of the two-phase flow system.

Since the conductance signal of two-phase flow can represent the information of its phase holdup and phase distribution, the application of conductance sensor in the field of multiphase flow has a long history, and the array conductance sensor can simultaneously obtain the information of the two-phase flow system on the cross section. Distributed conductance value, and no interference to the flow field, good security, so more attention and research, such as electrical resistance tomography (Electrical Resistance Tomography) technology is based on the conductance signal of the two-phase flow obtained by the array conductance sensor Reconstruction of phase distribution images to achieve flow pattern identification and void ratio measurement, but due to the mutual constraints between image reconstruction accuracy and real-time performance, its application to actual measurement is limited

[0003] Traditional single-phase flowmeters such as orifice plates, venturis, and nozzles have been widely used in the measurement of gas-liquid two-phase flow for a long time. Many researchers have proposed many valuable gas-liquid two-phase flow measurement methods for throttling elements. Most of these relational expressions are correlational expressions of dryness and flow, and one of the parameters must be known in advance to measure the other, and both are measurement difficulties in the two-phase flow system, and there is no effective solution, so saving In many cases, the flow element cannot realize the online measurement of gas-liquid two-phase flow parameters alone

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