Capacitance tomography sensor with powder dielectric coefficient variation measurement electrode

Abstract

The invention relates to a powder distribution and flow measurement sensor in a powder pipeline, in particular to a capacitance tomography sensor with a powder dielectric coefficient variation measurement electrode. The capacitance tomography sensor comprises a sensor inner frame which is generally a pipeline with circular or rectangular section, powder distribution measurement electrode arrays on the outer wall of the inner frame, powder dielectric coefficient variation measurement electrode sets, an electrode end shielding electrode, an inter-electrode shielding electrode, a signal transmission cable and a shielding cover outside the sensor. When the measured powder flows through the sensor inner frame, the distribution measurement electrode arrays measure the spatial distribution of the powder, and the dielectric coefficient variation measurement electrodes measure the variation degree of the powder dielectric coefficient. The powder dielectric coefficient variation signals provided by the dielectric coefficient variation measurement electrodes can be used for correcting the data of the distribution measurement electrodes so as to reconstruct the spatial distribution of the powder more accurately.

Description

technical field [0001] The invention relates to a particle distribution and flow measurement sensor in a powder pipeline, in particular to a sensor used in the measurement of high-concentration powder flow (such as plug column, wavy flow, etc.), and has the ability to detect powder The change of dielectric coefficient provides data, so that the matching ECT measurement system can correct the influence of the change of dielectric coefficient. Background technique [0002] Dilute phase flow and dense phase flow exist in the pipeline when powders and granules (such as coal powder, cement powder, lime powder, various grain powders, etc.) are transported in the pipeline. For different flow states, there are different distribution forms of powder and grain on the pipe section. For example, in the dilute phase flow, the powder and grain are usually scattered in the space very sparsely, and are distributed in various parts of the pipeline cross section. In dense phase transportati...

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Problems solved by technology

Foreign patents US5130661-A, US5291791-A, domestic CN1395093A, CN101441099A, CN1920545A, CN01229907, are not equipped with special electrodes for the measurement of the dielectric coefficient of the material and correct the imaging capacitance accordingly

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