Multi-section impedance long-waist internal cone sensor and multi-phase flow measurer

Abstract

The invention belongs to the technical field of fluid measurement, and relates to a multi-section impedance long-waist internal cone sensor which comprises a cone throttling piece, a systolic pressure drop differential pressure transmitter, a permanent pressure loss differential transmitter and an electrical sensitive sensor, wherein the cone throttling piece is a long-waist internal cone throttling device which comprises a front-section cone body, a middle-section columnar body used as the waist part of the cone body and a rear-section cone body which are coaxially fixed at the center of a pipe through a support; an annular circulating space is formed by the three parts of the cone throttling piece and the wall of the pipe; and the electrical sensitive sensor comprises four groups of electrodes distributed on different sections in the annular circulating space, wherein two groups of similar electrodes are used for measuring the electrical conductivity of a mixed fluid, and the other two groups of similar electrodes are used for measuring the dielectric constant. The invention also provides a multi-phase flow measurer which adopts the multi-section impedance long-waist internal cone sensor and is used for measuring the multi-phase flow procedure parameters of a continuous phase within the range from a conductive phase to a non-conductive phase. The multi-section impedance long-waist internal cone sensor and the multi-phase flow measurer have the characteristics of high measuring precision, high reliability, capability of obtaining the measuring information and the like.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and in particular relates to a measuring device which integrates the principle of differential pressure measurement and electrical measurement principle, and is used to determine the component content, Parameters such as velocity and flow. The present invention takes the measurement of oil / gas / water multiphase flow as the description object, but is not limited to this application, and the measuring device of the present invention is still applicable in other industrial processes and chemical reactions. technical background [0002] Multiphase flow usually refers to the flow of two or more substances at the same time, including gas-liquid two-phase flow, gas-solid two-phase flow, liquid-solid two-phase flow, liquid-liquid two-phase flow, and gas-liquid-liquid and gas-liquid-solid multiphase flow flow etc. Multiphase flow in pipelines often occurs in modern engineering fields and equipm...

AI Technical Summary

Problems solved by technology

The inner cone flowmeter can achieve more accurate and effective flow measurement of clean or dirty fluid with a wider range ratio under the condition of a shorter straight pipe section, but its own structural characteristics also have some disadvantages: at the tail of the cone The existence of the vortex area causes the pulsation of the pressure signal here, which reduces the measurement accuracy and repeatability, and the overall pressure loss is large. For example, the structural deformation of the inner cone flowmeter is made according to the flow characteristics of the multiphase flow, such as the inner Venturi tube. , spindle flowmeter and shuttle flowmeter, etc., can effectively improve the accuracy and stability of multiphase flow measurement

However, tomography technology has not yet met the requirements of industrial applications in terms of real-time performance, measurement accuracy, and image quality, and the conflict between the rapidly changing characteristics of multiphase flow and the complexity of tomography image reconstruction algorithms may lead to inconsistencies in the calculation results. big error

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