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Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system

A throttling device, Venturi technology, applied in the direction of detecting fluid flow by measuring pressure difference, volume/mass flow generated by mechanical effects, instruments, etc., can solve the problem that it is difficult to ensure that the flow parameters of the two-phase fluid flow through the combined device are consistent , principle error and other issues, to achieve accurate flow pattern and phase holdup measurement, simple implementation, and small device volume

Inactive Publication Date: 2008-05-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this method is whether the gas-liquid ratio of the two-phase fluid in the sampling part is consistent with the ratio in the original flow; whether the sampling ratio (constant) itself is affected by the flow pattern, flow fluctuation, etc.
If the volume of the measuring device is too large, it is difficult to ensure that the flow parameters of the two-phase fluid flowing through each component of the combined device are consistent, so there is a principle error
In addition, the differential pressure taken by the traditional differential pressure flowmeter usually includes the frictional pressure drop. In the gas-liquid two-phase flow, the frictional resistance has a significant impact on the measurement. How to measure only the accelerated pressure drop of the differential pressure flowmeter and not The absence of frictional pressure drop is the key to accurate measurement

Method used

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  • Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system
  • Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system

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Embodiment Construction

[0014] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0015] Referring to Figure 1 and Figure 2, Figure 1 is a front view and Figure 2 is a top view. The slit Venturi throttling device of the present invention includes an inlet 9 , a constriction section 17 , a slit section 18 , an expansion section 19 and an outlet 10 . The slit section 18 in the middle is a long and narrow pipe at one end, and its cross-section is a long and narrow rectangle whose length is much greater than its width. From the front view, the width of the slit section 18 is greater than that of the shrinkage section 17 and the expansion section 19 , and viewed from a top view, the width of the slit segment 18 is much larger than the width of the constriction segment 17 and the expansion segment 19 . The cross-sectional area of ​​the tube of the slit section 18 is smaller than that of the constriction section 17 and the expansio...

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Abstract

The invention pertains to the technical field of fluid measurement, which relates to a slit Venturi throttle device, including an entrance, a contraction section, a slit section, an expansion section and an exit which are connected sequentially, the contraction section is a section of long narrow pipeline, the cross-section of the contraction section takes a shape of a long narrow rectangle, and the area of the cross section thereof is smaller than the area of the cross sections of the entrance and the exit. The invention also provides a two-phase flow measurement system which adopts the throttle device. The Venturi throttle device and the two-phase flow measurement system which are provided by the invention can effectively eliminate the influence of the friction pressure drop on the measurement, the devices can be applicable to the different gas-liquid two-phase media, different pipeline materials and other working conditions, and the factors which are related with the friction force and affect the measurement can be reduced or eliminated. The invention makes use of the gravity potential pressure difference pulse signals and the time equalization signals which are perpendicular to the horizontal flow direction, at the same time, the invention can avoid the influence of the frictional resistance and accurately identify the flow type and measure the fraction rate, furthermore, the implementation is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of flow measurement, and relates to a two-phase flow phase holdup and flow measurement system. Background technique [0002] Two-phase flow refers to a flow system composed of two-phase substances (at least one phase is a fluid). If there are more than two phases of substances in the flow system, it is called multiphase flow. Two-phase or multiphase flow is the most common viscous fluid flow involved in the process of phase change, mass transfer and reaction in chemical production. Heat transfer with phase changes, gas absorption in column equipment, liquid distillation, liquid extraction, and chemical reaction processes in stirred tanks or bubble columns all involve two-phase flow. In the oil-gas-water three-phase flow measurement in the petroleum industry, the separation device is used to initially separate the fluid to obtain a two-phase flow fluid. Two-phase flow fluid is divided into gas-liquid, gas-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/00G01F1/44
Inventor 方立德张涛
Owner TIANJIN UNIV
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