Single-cross section impedance type long-waist inner cone sensor and multiphase flow measuring device

Abstract

The invention belongs to the technical field of flow measurement, relating to a single-cross section impedance type long-waist inner cone sensor which comprises a cone throttling element, a systolic pressure drop differential pressure transmitter, a permanent pressure loss differential pressure transmitter and an electrical sensitivity sensor; as the long-waist inner cone throttling element, the cone throttling element is composed of a front-section cone, a middle-section cylinder as the waist of the cone and a back-section cone, is coaxially fixed at the center of a pipeline by a support and forms an annular circulating space with the pipe wall of the pipeline; the electrical sensitivity sensor comprises a group of electrodes which are distributed in the annular circulating space and are positioned at the same cross section of the pipeline; the group of electrodes are composed of an inner electrode and an outer electrode; the inner electrode is the cone throttling element or is fixed on the surface of the waist of the cone; and the outer electrode is fixed on the inner wall of the pipeline. The invention simultaneously provides a single-cross section impedance type long-waist inner cone multiphase flow measuring device adopting the sensor. The sensor and the measuring device have the characteristics of high precision, high reliability, low cost 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, and is used to determine the component content, flow velocity and flow and other parameters. 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 equipment...

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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