Research On Electrical Capacitance Tomography Technique Of Two-Phase Flow

Electrical capacitance tomography (ECT) is a novel technology of computerised tomography (CT) brought forward by UMIST of U.K. in the late 1980s,which has a number of capacitive electrodes mounted evenly around the periphery of measured object, and measures the capacitance value between electrodes to know the distribution of dielectric constant, which is mainly used in detection of multi-phase flow in industrial pipeline. It can reveal the visual information of every phase in close pipeline or vessel such as concentration, distribution and status of action, but the general instruments cannot. In comparison with the other techniques, ECT has its advantages of extensive applicability, being noninvasive, safe to operate, low-cost, which can be applied to general multi-phase flow in industrial process of production and is suitable to be used in China. More profound study is focused on the key problems such as field distribution model of ECT system, optimized design of transducers, image reconstruction algorithm, flow regime recognition and corresponding software. The study we have done is as follows.1.Principle analysis of ECT systemThe mathematical model of capacitance sensitivity field is presented according to the principle analysis of ECT system and the following study is based on it. The results of flow regime recognition and image reconstruction prove that the model is reasonalbe.2.Capacitance sensitivity distribution obtained based on the finite element model of capacitance sensitivity field...