Probe of measuring gas-solid two-phase flow particle slip velocity and measurement method

Abstract

The invention discloses a probe of measuring a gas-solid two-phase flow particle slip velocity. The probe comprises an optical imaging unit, a hot film velocity measuring unit and a light source transmission unit. An optical fiber imaging unit comprises an endoscope objective lens, a reflecting cover, a glass plain sheet and a silica fiber. The hot film velocity measuring unit comprises a hot film sensor and a microcircuit. The hot film sensor is arranged in a periphery of the glass plain sheet. The microcircuit is arranged in a reserved pipeline. The light source transmission unit comprises a laser light emitting port and glass optical fibers. The laser light emitting port is arranged in the periphery of the glass plain sheet of a probe head end portion. The glass optical fibers are uniformly arranged on a wall surface of an outer side of a stainless steel pipe. By using the probe in the invention, optical fiber imaging, hot film velocity measuring and light source transmission are integrated into one body; a gas velocity and a particle velocity in a gas-solid two-phase flow can be simultaneously measured; and a difference value of the gas velocity and the particle velocity is used to acquire a particle slip velocity.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a probe and a measuring method for measuring the slip velocity of gas-solid two-phase flow particles. Background technique [0002] Fluidization is a high-efficiency gas-solid, liquid-solid or gas-liquid-solid three-phase operation process suitable for large-scale production. In the field, there are fluidized applications. Compared with traditional reactor equipment, the fluidized bed has large production capacity, high heat and mass transfer efficiency, easy control of bed temperature, and easy addition and removal of bed materials. Relatively short, good incineration characteristics, advanced incineration technology still under development. In order to study the internal flow field of gas-solid two-phase flow, the researchers used methods such as experimental measurement and numerical simulation of the flow field to understand the flow conditions in the fluidize...

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Problems solved by technology

[0003] At present, although some flow parameters in the flow field have been obtained through experimental measurement and numerical simulation, there are still some problems in the application process: (1) In the case of flow field motion obtained through numerical simulation, although the approximate flow field motion characteristics, but still cannot match the actual gas-solid two-phase internal flow field well, the model is not very universal, and can only be simulated and predicted for specific flow fields and specific operating conditions; (2) currently through experimental methods There are many methods to measure the fluidized bed, but there are also many disadvantages. The measurement methods for gas velocity and particle velocity in dense gas-solid two-phase flow are relatively scarce; (3) The effect of slip velocity on the study of gas-solid two-phase flow Scale inhomogeneous structure has very important value. The current method of measuring the characteristic parameters of gas-solid two-phase is generally to measure the characteristic parameters of gas phase and solid phase separately. There is no experimental device for measuring the characteristic parameters of gas-solid two-phase at the same time.

At present, there is no equipment capable of measuring particle slip velocity in gas-solid two-phase flow, which greatly affects the experimental research on particle heterogeneity in gas-solid two-phase flow, especially in the dense phase region; the current fiber optic probe cannot Capture clear images

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