Multiphase flow capacitance normalization method used for electrical capacitance tomography

Abstract

The invention discloses a multiphase flow (the below mentioned multiphase flow specially means three-phase flow and above three-phase flow) capacitance normalization method used for electrical capacitance tomography. Present normalization methods only aim at two-phase flow, and only take the capacitance value in the full field distribution of two dielectric constant phases into consideration, and a two-phase flow normalization model in three or above different dielectric constant phases existing in the multiphase flow, which only takes the capacitance values in the highest phase and lowest phase full field distribution case into consideration and neglecting the capacitances in the case of full field distribution of other dielectric constant phases, causes normalization error accumulation and affects the precision of an image reconstructing integrity. The multiphase flow capacitance normalization method used for electrical capacitance tomography, provided by the invention, considers the influences of the capacitances in the case of full field distribution of different dielectric constants on the measurement values of measured capacitances, and improves the precision of image reconstructing algorithm.

Description

technical field [0001] The invention belongs to the field of automatic detection, and relates to a capacitance normalization method for capacitance tomography multiphase flow (the multiphase flow mentioned below refers specifically to three-phase flow and multiphase flow above three-phase flow). It is used to normalize the capacitance measurement value before reconstructing the image by electrical capacitance tomography. Background technique [0002] Multiphase flow is a complex flow phenomenon that widely exists in petroleum, power, energy and other industrial fields. With the rapid development of science and technology, as well as the increasing demand for measurement, energy saving and control in industrial production, the research of multiphase flow has become the frontier of great concern at home and abroad, and the development of multiphase flow detection technology has played an important role in the research of multiphase flow. plays a key role in. In 2013 Tan Chao...

AI Technical Summary

Problems solved by technology

However, there are three or more phases with different permittivity in multiphase flow. In this case, if the above normalized model is still used, only the capacitance values ​​of the highest phase and the lowest phase are considered when the field is distributed, and the remaining dielectric constants are ignored. The capacitance value when the electrical constant is distributed across the field will cause the accumulation of normalized errors and affect the overall accuracy of image reconstruction. Therefore, the present invention proposes a capacitance normalization method for multiphase flow in capacitance tomography, which takes into account The influence of the capacitance value on the measured capacitance measurement value when different dielectric constants are distributed in the full field improves the accuracy of the image reconstruction algorithm

Images