System and method for real-time measurement of gas-solid two-phase flow field

Abstract

The invention provides a system and method for real-time measurement of gas-solid two-phase flow field gas-solid two-phase flow field. The system comprises at least one solid-phase camera, at least two gas-phase cameras, a computing device and a display device. The method comprises the steps of: (1) controlling at least one digital high-speed camera, which is low in resolution ratio, high in frame transfer time and larger in mutually spliced visual fields, to acquire motion track images of solid-phase particles, and controlling at least two digital high-speed cameras, which are high in resolution ratio, low in frame transfer time and lower in mutually spliced visual fields, to acquire motion track images of gas-phase fluorescent tracing particles; (2) respectively obtaining motion vector images of the solid-phase and the gas-phase particles; and (3) synchronously outputting and displaying the motion vector images of the solid-phase and the gas-phase particles in real time. According to the invention, the applicable range of an image speed measurement technology, the efficiency in gas-solid two-phase flow measurement is increased, the complex phase separation operation is avoided, the online measurement of the gas-solid two-phase flow fields is realized, and the quantitative research on the dynamic evolution of particle agglomeration is made possible.

Description

technical field [0001] The invention relates to the technical field of multiphase flow laser measurement, in particular, the invention relates to a real-time measurement system and method for gas-solid two-phase flow flow field. Background technique [0002] The heat transfer, mass transfer and reaction performance of gas-solid two-phase flow reactors are closely related to the instantaneous kinetic behavior of mesoscale particle agglomeration in the reactor. Therefore, it is necessary to obtain and display online the flow information of micro-scale single particles or fluid micro-units and meso-scale particle aggregates, or even gas-solid two-phase flow information on the macro-reactor scale through high-precision, non-invasive measurement methods. The basis and key to develop a new type of high-efficiency gas-solid two-phase flow reactor. [0003] Measurement techniques such as digital high-speed photography (CCD), positron emission tracking detection (PEPT) and nuclear m...

AI Technical Summary

Problems solved by technology

This type of practice is currently limited to bubble flow in gas-liquid two-phase flow [Fuzio, et al. Proceedings of Int. Conf. on Fluids Eng., Kwangju, 1994; Tokuhiro, et al. , 24:1383-1406] and low-velocity or dilute gas-solid / liquid-solid [Martin, et al. Powder Technol., 2005, 155:175-180] and other simple flow measurements

Moreover, the contradictory limitation between the camera resolution and the size of the field of view also makes the number of effective discrete-phase particle images that can be obtained in one measurement by this method less, because it is not representative, it cannot fully summarize and reflect the specific discrete-phase particles Hydrodynamic behavior of aggregates or entire discrete phases

Therefore, its application range is greatly limited

[0006] In summary, the existing gas-solid two-phase flow field measurement technology has poor real-time performance, it is difficult to take into account the imaging resolution and field of view of two-phase particles at the same time, and it is difficult to quantitatively measure the dynamic evolution of particle agglomeration.

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