Method and apparatus for on-line measuring two-dimension speed and particle size distribution of granules in pipe

Abstract

The invention relates to gas-phase and solid-phase flow particle online kinetic characteristic analysis technology, aiming at providing a method and a device which are used for the online measurement of intraductal gas-phase and solid-phase flow particle two-dimensional velocity field and particle size distribution. The device comprises a laser which is a low-power continuous laser of an emittingsheet laser; the laser is movably arranged on a guideway surrounding a pipeline to be measured, the plane of the guideway is vertical to the axial lead of the pipeline to be measured; a CCD camera isalso movably arranged on the guideway, with the lens direction vertical to the direction of the plane of the sheet laser; and the measured position of the pipeline is installed with a transparent glass window. The technology has low cost, compact measuring system and strong field operability, and can carry out online real-time measurement on particle field two-dimensional speed, particle size distribution and particle concentration to different sectional flow fields in the pipeline.

Description

technical field [0001] The invention relates to an online movement characteristic analysis technology of gas-solid two-phase flow particles, in particular to a method and device for online measurement of two-dimensional velocity field and particle size distribution of gas-solid two-phase flow particles in a tube. Background technique [0002] Pneumatic conveying is an effective method of using airflow to transport granular solids in pipelines. It is an important technology in the current industrial production process and is widely used in the conveying and drying processes of granular and powder materials in various industrial sectors. Typical For example, the pipeline transportation of pulverized coal in power plants. In the actual production process, people need to know the status and changes of the conveyed particle flow in real time, so that the production process can be adjusted and optimized in time. Therefore, it is very necessary to develop an on-line monitoring dev...

AI Technical Summary

Problems solved by technology

[0003] The traditional sampling measurement method requires offline analysis, which cannot meet the requirements of online trial measurement of particle flow in the pipeline

However, measurement methods like probes are often single-point measurements, and the contact flow field causes interference

Measurement methods such as electrostatic method, heat transfer method, microwave method, ultrasonic method and capacitance method are mainly used in the measurement of particle concentration in pipes, and cannot perform real-time online measurement of particle movement inside the flow field, and cannot obtain particle velocity field and particle size distribution, etc. information

Among the optical methods, Doppler measurement technology has been widely used in the field of flow field diagnosis, but it is limited to single-point measurement, and it cannot be applied to industrial online measurement due to the complexity of the system and expensive equipment.

In addition, the currently relatively mature particle image velocimetry (PIV) is also widely used in flow field diagnosis due to its characteristics of full-field, non-contact, two-dimensional plane, transient and high-precision measurement. Difficulty and other reasons, it cannot be applied to the on-line measurement of the on-site industrial production process at present

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