Non-contact three-dimensional measurement device and method for particle movement of fluidized bed

Abstract

The invention provides a non-contact three-dimensional measurement device and a non-contact three-dimensional measurement method for the particle movement of a fluidized bed. Gamma ray detectors arranged in an orthometric manner at the same height capture tracer particles and give out gamma rays; the gamma ray detectors convert the gamma rays into electric signals; the electric signals are processed by a sensitive signal amplifier, a converter, a forward analogue-digital sampler and a lateral analogue-digital sampler to respectively generate a forward perspective view and a lateral perspective view; and then the three-dimensional movement process of the particles is reconstructed through a three-dimensional image reconstruction module. The measurement device and the method provided by the invention employ safe ray for imaging so that three-dimensional, real-time, accurate and safe measurement of the particle movement of the fluidized bed is realized without affecting a flow field.

Description

technical field [0001] The invention relates to a measurement method and a measurement device for particle movement of a gas-solid fluidized bed, belonging to the technical field of fluidized bed and multiphase flow measurement. Background technique [0002] Gas-solid fluidized bed is widely used in catalytic cracking, coal combustion, coal gasification and other industries. Heat treatment technologies such as fluidized bed combustion and gasification have become mainstream technologies that can realize large-scale resource disposal and utilization of solid waste and municipal solid waste due to their advantages of high efficiency, significant capacity reduction, and heat recovery. In the scientific research, engineering design and industrial application of fluidized bed heat treatment technology, it is necessary to master the movement laws of particles in the bed under different operating parameters. Grasping the law of fluidized bed particle motion is the key to understan...

AI Technical Summary

Problems solved by technology

However, these tracking methods have more or less disadvantages: thermal particle tracking has fast temperature attenuation, the accuracy is not ideal, and three-dimensional measurement cannot be performed; phosphorescent particle tracking and dyed particle tracking use visible light to capture particle motion, making three-dimensional measurement difficult; Magnetic particle tracking interferes with the flow field; radioactive particle tracking methods such as gamma ray tomography are internationally recognized as the most effective means of particle tracking, but the three-dimensional tomographic scanning takes a long time, and the speed of tomographic imaging is not related to that of particles. The high-speed movement does not match, and some radioactive materials also have safety problems

[0004] The measurement of particle motion in a gas-solid fluidized bed has always been an international problem. At present, there is no method that can fully realize the three-dimensional, real-time, accurate and safe measurement of the flow field.

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