Real-time detection apparatus for coal powder concentration and phase distribution in pneumatic conveying pipe

Abstract

The invention discloses a real time detection device which belongs to the technical field of gas-solid phase flow detection and relates to the coal powder concentration and phase distribution in a pneumatic transmission pipeline. A sensor composite pipe section of the detection device is connected with a technical pipeline to be detected by a flange and a gasket seal. A spotted gamma source of the sensor is arranged on an axial line of the sensor composite pipe section. The gamma ray emergence angle of a gamma source collimator is 360 degrees plane emergence angle, and the emergence plane is vertical with the axial line of the sensor composite pipe section. A gamma ray detector consists of n independent ionization chambers of respectively-matched electrometers which form an annular ionization chamber array coaxial with a sensing and measuring pipe section. The detection device ensures that the influence of gas-solid phase flow pattern and phase distribution on the measurement of volume concentration can be reduced to the extent that can be neglected; radioactivity activity of required gamma ray source is reduced by times under the precondition of the same measurement precision; the field space occupied by a measuring device is reduced obviously; the cost is reduced obviously; the radiation protection range is reduced obviously; and gamma ray protection requirement and difficulty are reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of gas-solid two-phase flow detection, in particular to a real-time detection device for coal powder concentration and phase distribution in a pneumatic conveying pipeline Background technique [0002] The primary air pipeline of the boiler in a coal-fired power plant is a typical pneumatic conveying pipeline. Air (hot air) transports solid particles (coal powder) to the furnace, and its flow belongs to gas-solid two-phase flow. Since the 1980s, scholars at home and abroad have successively proposed and tested a variety of methods for the measurement of solid phase concentration in gas-solid two-phase fluids, mainly including heat transfer method, heat balance method, pressure drop method, capacitance method, electrostatic method, and capacitance method. Tomography, Venturi tube method, microwave method, radiation method, etc. Among the methods listed above, except for the radiation method, other sensors are...

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Problems solved by technology

[0005] 2. Measuring equipment takes up a lot of space on site

In this scheme, the linear radiation source, source collimator, tested pipeline, γ-ray detector collimator, and ray detection array must be arranged on a straight line perpendicular to the tested pipeline. The space will be very large, and it is impossible to consider or take into account this requirement in the initial design of the process pipeline, so the use of the measuring device is limited by the site conditions

[0006] 3. The cost of linear radioactive sources is high

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