Online measurement device and online measurement method of double-pressure difference gas-liquid flow rate

Abstract

The invention discloses an online measurement device and an online measurement method of double-pressure difference gas-liquid flow rate. The online measurement device comprises a Venturi flowmeter; a gas-liquid pipe is arranged at one end of the Venturi flowmeter; the gas-liquid pipe is connected with a V-cone flowmeter through a connecting flange; a first pressure gauge is arranged at the front end of the Venturi flowmeter; a second pressure gauge is arranged at the throat part of the Venturi flowmeter; a fourth pressure gauge is arranged at the rear end of the V-cone flowmeter; a third pressure gauge is arranged at a position, between the fourth pressure gauge and the connecting flange, on the V-cone flowmeter. During an actual online gas-liquid flow rate measurement process, respective pressure differences of the Venturi flowmeter and the V-cone flowmeter in a pipeline are acquired and are transmitted into a processor; a gas-liquid two-phase flow rate measurement model is established in the processor; respective flow rates of a gas phase and a liquid phase are calculated and outputted according to the measured pressure differences and by combining the physical parameters of the pipeline and a fluid inputted through a human-computer interface; the online measurement device and the online measurement method have high measurement stabilities.

Description

technical field [0001] The invention relates to an on-line measurement device and an on-line measurement method for gas-liquid flow with double pressure differences. Background technique [0002] Most of the flowmeters currently on the market are flowmeters used for single-phase fluid measurement, and the types of flowmeters for online measurement of gas-liquid two-phase flow are few and expensive. The differential pressure flowmeter has stable performance and low cost. It is widely used in single-phase fluid measurement. According to the pipe size, fluid physical properties and the pressure difference of the flowmeter, the current flow rate can be obtained. The dual pressure differential flowmeter is mainly composed of two differential pressure flowmeters at the front and rear, and is used to measure the gas-liquid two-phase flow at the same time. Phase flow. The existing dual-pressure differential gas-liquid flow on-line measurement device has a long throat Venturi flowm...

AI Technical Summary

Problems solved by technology

The existing dual-pressure differential gas-liquid flow on-line measurement device has a long-neck Venturi flowmeter with a pressure-taking point added to the throat of the Venturi. This flowmeter is due to the similarity of the flow field between the upstream and downstream pairs of pressure-taking points , may affect the flow pattern adaptation range of the flowmeter

There are also fully symmetrical V-cone flowmeters and double-V-cone combined flowmeters, which also have the problem of large similarity between the front and rear measurement flow fields.

There is also a combination of a V-cone flowmeter upstream and a Venturi flowmeter downstream. The V-cone will greatly disturb the downstream flow field and affect the measurement performance of the downstream Venturi flowmeter.

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