On-line measurement method for particle size distribution and shape distribution of granules in airflow conveying pipe

A particle size distribution and airflow conveying technology, applied in particle size analysis, particle and sedimentation analysis, measurement devices, etc., can solve problems such as difficult maintenance, low efficiency, and complex system, and achieve the effect of reducing requirements and reducing costs.

Inactive Publication Date: 2012-04-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, such a design is costly, complex and inefficient, has poor reliability and is difficult to maintain

Method used

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  • On-line measurement method for particle size distribution and shape distribution of granules in airflow conveying pipe
  • On-line measurement method for particle size distribution and shape distribution of granules in airflow conveying pipe

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Embodiment Construction

[0020] The invention provides an online measurement method for particle size distribution and shape distribution of granular materials in an airflow conveying pipeline. Using a three-color laser and an RGB digital camera as an image acquisition device, the particle size distribution and shape distribution of the particulate material in the airflow conveying pipeline are measured online. Combine below figure 1 Description of the present invention:

[0021] First, three lasers with different spectra, namely red (R) laser 3, green (G) laser 4, blue (B) laser 5, RGB digital camera 6 and telecentric lens (telecentric lens) 7 form the particle flow field 1, and installed on the measured gas-solid two-phase fluid pipeline 10. In order to achieve the purpose of covering complete particles in the laser sheet without overlapping particles, the thickness of the laser light sheet 2 sheet laser should be within the range of 0.5 to 1.5 times the maximum particle diameter of the measured p...

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Abstract

The invention discloses an on-line measurement method for particle size distribution and shape distribution of granules in an airflow conveying pipe, and belongs to the technical field of on-line measurement of gas-solid phase flow. The on-line measurement method comprises the following steps: in the gas-solid phase fluid pipe, irradiating three sections in a granular flow field at the same time by three pulse laser sheet sources with different spectrums, and capturing RGB (red, green and blue) images of the flowing granules on the three illuminated sections of the flow field at the same time by adopting an RGB digital camera; and decomposing the RGB image of each frame and respectively processing three sub-images by an image processing method so as to obtain particle size distribution and shape distribution of the measured granules. The on-line measurement method has the beneficial effects that the images of the granules on three different sections of the flow field can be acquired at the same time by adopting three lasers with different spectrums, the RGB camera and a telecentric lens; imaging on a plurality of focusing surfaces can be realized simultaneously; and the exposure time of the camera can be controlled by means of pulse feedback of the lasers so as to realize imaging of the flowing granules, thus greatly lowering the complexity of a measuring device and improving the measurement efficiency.

Description

technical field [0001] The invention belongs to the technical scope of on-line measurement of gas-solid two-phase flow, and in particular relates to an on-line measurement method for particle size distribution and shape distribution of granular materials in an airflow conveying pipeline based on three-color lasers and RGB digital cameras. 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 transportation and drying process of granular materials and powder materials in various industrial sectors. A typical example is the pipeline transportation of solid fuels such as coal powder in thermal power plants. The pulverized coal from the coal mill is carried by compressed air and supplied to multiple conveying pipes, and then enters the burner array to burn in the furnace. The particle size distributio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01B11/24
Inventor 闫勇高凌君卢钢
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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