Powder mass flow rate measuring device and method based on electrostatic and capacitive sensor arrays

Abstract

The invention discloses a mass flow rate measuring device and method based on electrostatic and capacitive sensor arrays for powder particles in a pipeline. The powder mass flow rate measuring device comprises an electrostatic sensor array, a capacitive sensor array, a data collecting module and a data processing module; the data collecting module is used for collecting electrostatic signals between each pair of electrostatic electrode slices in the electrostatic sensor array and output signals between two adjacent capacitive electrode slices in the capacitive sensor array; the data processing module comprises a powder speed calculation unit, a powder concentration calculation unit and a powder mass calculation unit. According to the powder mass flow rate measuring device and method, concentration distribution and speed distribution of powder on the pipeline section are fully taken into account, and therefore accurate measurement on the powder mass flow rate is achieved.

Description

technical field [0001] The invention belongs to the technical field of flow measurement, in particular to a device and method for measuring the mass flow of powder particles in a pipeline based on an array of electrostatic and capacitance sensors. Background technique [0002] Gas-solid two-phase flow widely exists in industrial production processes such as petroleum, electric power, and chemical industry. Realizing the on-line and accurate measurement of gas-solid two-phase flow is of great significance to improving industrial production efficiency and realizing energy saving and environmental protection. At present, people have tried to develop a variety of flowmeters based on different detection principles, and used in industrial production, such as electrical method, optical method, acoustic method, radiation method and so on. [0003] However, in the process of industrial gas-solid two-phase flow, because the solid phase particles are affected by many factors such as a...

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Problems solved by technology

[0003] However, in the process of industrial gas-solid two-phase flow, because the solid phase particles are affected by many factors such as ambient temperature, humidity, and gas phase transportation speed, the distribution of particle concentration and flow velocity on the cross section of the pipeline is extremely uneven.

In flow measurement, if the concentration distribution and velocity distribution of solid particles in the cross-section of the pipeline are not considered, it will inevitably lead to large measurement errors, so that the accurate measurement and control of powder flow cannot be realized, which is not conducive to the safe and efficient operation of industrial production processes

Electrical capacitance tomography (ECT) technology can obtain the concentration distribution of solid phase particles in the pipeline section, but due to the complexity of its detection system and the large concentration measurement error caused by image reconstruction

Electrostatic sensors can realize particle velocity measurement, but for the case of cross-sectional velocity distribution, there is a large deviation in the average velocity measurement, so the flow rate also has a large measurement error

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