CN-116380178-B - Forced annular flow measuring device for dynamic regulation and control of gas-liquid two-phase flow

Abstract

The invention relates to a forced annular flow measuring device for dynamic regulation and control of a gas-liquid two-phase flow, which comprises a cyclone (1), a front liquid film measuring sensor (2), a rear liquid film measuring sensor (3) and a venturi flowmeter (7), wherein the cyclone (1), the front liquid film measuring sensor (2), the rear liquid film measuring sensor (3) and the venturi flowmeter (7) are sequentially arranged in a measuring pipeline from upstream to downstream, a diversion trench (8) is formed in a measuring pipeline section between the front liquid film measuring sensor (2) and the rear liquid film measuring sensor (3), a liquid phase regulating window (4) is arranged outside the measuring pipeline section, the liquid phase regulating window (4) is communicated with a measuring pipeline through the diversion trench (8), the lower part of the liquid phase regulating window (4) is communicated with a bypass, and a regulating valve (5) and a liquid phase flowmeter (6) are arranged on the bypass.

Inventors

• WANG CHAO
• ZHU YANFENG
• SUN HONGJUN

Assignees

• 天津大学

Dates

Publication Date

20260505

Application Date

20230417

Claims (2)

1. 1. A forced annular flow measuring device for dynamic regulation and control of gas-liquid two-phase flow comprises a cyclone (1), a front liquid film measuring sensor (2), a rear liquid film measuring sensor (3) and a venturi flowmeter (7) which are sequentially arranged in a measuring pipeline from upstream to downstream, wherein a diversion trench (8) is formed at a measuring pipeline section between the front liquid film measuring sensor (2) and the rear liquid film measuring sensor (3), a liquid phase regulating window (4) is arranged outside the measuring pipeline section, the liquid phase regulating window (4) is communicated with a measuring pipeline through the diversion trench (8), the lower part of the liquid phase regulating window (4) is communicated with a bypass, a regulating valve (5) and a liquid phase flowmeter (6) are arranged on the bypass, the lower part of the liquid phase regulating window (4) is connected to the measuring pipeline at the downstream of the venturi flowmeter (7) through the bypass, the grooving direction of the diversion trench (8) is consistent with the rotational flow direction of the measuring pipeline section between the front liquid film measuring sensor (2) and the rear liquid film measuring sensor (3), the liquid phase regulating window (4) is communicated with the measuring pipeline through the diversion trench (4) at the front annular flow regulating window and the liquid film regulating and the liquid phase regulating window (4), the separation speed is determined by a regulating valve (5), and the opening regulating signal of the regulating valve (5) is determined according to the liquid film thickness acquired by a front liquid film measuring sensor (2) and a rear liquid film measuring sensor (3).
2. 2. The forced annular flow measuring device for dynamic regulation and control of gas-liquid two-phase flow according to claim 1, wherein at least three diversion trenches (8) are uniformly distributed on one section of the measuring pipeline section.

Description

Forced annular flow measuring device for dynamic regulation and control of gas-liquid two-phase flow Technical Field The invention belongs to all application fields related to gas-liquid two-phase flow measurement, and relates to a forced annular flow measurement device for dynamic regulation and control of gas-liquid two-phase flow. Background The gas-liquid two-phase flow is widely used in industrial production and daily life, such as a central heating system, a sewage treatment system, a natural gas exploitation and transportation system, a nuclear energy water cooling system and the like, and is closely related to the gas-liquid two-phase flow. The flow is an important characteristic parameter of the gas-liquid two-phase flow, and accurately measuring the flow of the two-phase flow plays an important role in the manufacture and design of facility equipment, the supervision and guarantee of production safety, the management and control of production flow, the development and utilization of energy, the innovation of engineering equipment and the like. The flow patterns of the gas-liquid two-phase flow in the flowing process are complex and changeable, and various flow patterns such as bubble flow, bullet flow, slug flow, annular flow, droplet flow and the like can be displayed on the section of the pipeline, so that the fluctuation of an output signal of the instrument of the two-phase flow is severe, and the reliability and the accuracy of a flow measurement result are difficult to guarantee. Therefore, researchers propose to use a cyclone to forcedly form a gas-liquid two-phase flow with random phase space distribution into a spiral annular flow with regular distribution, and the dependence of the flowmeter on an inlet flow pattern is effectively improved. At present, the forced annular flow measurement technology has realized the wet gas flow measurement of low liquid content, but in the actual industrial application process, the gas flow, the liquid content and other variable ranges of the gas-liquid two-phase flow are huge, and in many cases, stable spiral annular flow is difficult to form through a cyclone, so that the accuracy of the forced annular flow measurement is influenced, and even the measurement is possibly invalid. Disclosure of Invention The invention provides a novel forced annular flow measuring device for dynamic regulation and control of gas-liquid two-phase flow, which aims at solving the problem that flow measurement is difficult due to complex flow pattern and wide liquid content range of the gas-liquid two-phase flow. The technical proposal is as follows: A forced annular flow measuring device for dynamic regulation and control of gas-liquid two-phase flow comprises a cyclone 1, a front liquid film measuring sensor 2, a rear liquid film measuring sensor 3 and a venturi flowmeter 7 which are sequentially arranged in a measuring pipeline from upstream to downstream, wherein a diversion trench 8 is formed in a measuring pipeline section between the front liquid film measuring sensor 2 and the rear liquid film measuring sensor 3, a liquid phase regulating window 4 is arranged outside the measuring pipeline section, the liquid phase regulating window 4 is communicated with a measuring pipeline through the diversion trench 8, the lower part of the liquid phase regulating window 4 is communicated with a bypass, and a regulating valve 5 and a liquid phase flowmeter 6 are arranged on the bypass. Further, the lower portion of the liquid-phase regulating window 4 is connected to a measurement pipe downstream of the venturi flowmeter 7 through a bypass. Further, at least three diversion trenches 8 are uniformly distributed on one section of the measuring pipeline section. Further, the slotting direction of the diversion trench 8 is consistent with the rotational flow direction of the cyclone 1. Further, the opening degree adjusting and controlling signal of the adjusting and controlling valve 5 is determined according to the liquid film thickness collected by the front liquid film measuring sensor 2 and the rear liquid film measuring sensor 3. The forced annular flow measuring device for dynamic regulation and control of the gas-liquid two-phase flow provided by the invention mainly has the following advantages: 1) The dependence on the inlet flow pattern when the flowmeter measures the flow is effectively reduced through the cyclone; 2) The liquid phase part of the gas-liquid two-phase flow can be separated through the liquid phase dynamic regulation and control device, so that the spiral annular flow is maintained within the range of guaranteeing the measurement accuracy of the venturi flowmeter, the difficulty of two-phase flow measurement is effectively reduced, the flow measurement range is widened, and the flow measurement accuracy is improved. Drawings FIG. 1 is a forced annular flow measuring device for dynamic regulation of liquid phase. In the figure 1, a cyclone 1, a front end liq