Intra-tube phase-separated-type two-phase fluid electromagnetic flow meter measuring device and method

Abstract

The invention discloses an intra-tube phase-separated-type two-phase fluid electromagnetic flow meter measuring device and method. The measuring device and method are used for determining each phase flow of a two-phase fluid composed of a conductive phase such as surface water and industrial water and a non-conductive phase such as air, natural gas and oil; the device is mainly composed of a measuring pipeline, a mixer, a total flow metering device, a phase separation device, a section phase volume fraction measuring device, an electromagnetic flow meter and a signal processor; the method comprises the steps that a separation state with a clear phase boundary is formed by the adoption of an intra-tube phase separation technology, wherein the intra-tube central core is the non-conductive phase and the outer ring is the conductive phase, and the flow measuring is conducted. By the adoption of the intra-tube phase-separated-type two-phase fluid electromagnetic flow meter measuring device and method, the signal output of the electromagnetic flow meter is more stable without being influenced by the two-phase fluid types and the change of the non-conductive phase positions, and an electrode part cannot be polluted by the non-conductive phase; the phase volume fraction is easier to measure under the separation state, the errors are smaller, and the widespread application to projects is facilitated.

Description

technical field [0001] The invention belongs to the technical field of two-phase fluid measurement, and in particular relates to a measuring device and method for an in-pipe phase-separated two-phase fluid electromagnetic flowmeter, which is used to determine a conductive phase (such as surface water, industrial water, etc.) and a non-conductive phase (such as The flow rate of each phase of a two-phase fluid composed of air, natural gas, oil, etc.). Background technique [0002] "Phase" in the present invention refers to each part of the multiphase fluid with the same physical properties, such as gas phase, liquid phase, oil phase, water and so on. Each phase can be a single-component substance or a uniform mixture of multi-component substances, such as air, formation water, crude oil, etc. Two-phase flow in pipelines often occurs in modern engineering fields and equipment such as petroleum, chemical industry, food, metallurgy, and power. Accurate measurement of each phase ...

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Problems solved by technology

However, due to the non-uniformity of the actual two-phase flow, the deviation between this relationship and the experimental data will increase with the increase of α and the superficial velocity of water

The articles "Effect of phase distribution on weight function of an electromagnetic flow meter in 2D and in the annular domain" and "On finding the virtual current in an electromagnetic flow meter containing a number of bubbles by Two-dimensional analysis" studies the influence of bubble position and number on the virtual current potential distribution of electromagnetic flowmeter. The results show that both the position and number of bubbles will affect the distribution of the weight function, thereby affecting the output of the electromagnetic flowmeter

Due to the great randomness of the position of the non-conductive phase in the pipe in the two-phase flow, the output of the electromagnetic flowmeter has large fluctuations, and the measured value cannot be corrected accurately

Moreover, the existence of the non-conductive phase will seriously pollute the electrodes and affect the reliability of the signal, especially when the continuous phase is a non-conductive phase, the electromagnetic flowmeter has no signal output

It can be seen that, except for the working conditions where the content of non-conductive phase is very low, the traditional method of measuring two-phase flow with electromagnetic flowmeter is still difficult to meet the requirements of engineering in terms of reliability and measurement error.

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