研究目的
To develop a digital holographic sizer (DHS) for coal powder size distribution measurement, addressing the challenge of on-line and continuous measurements in coal-fired plants.
研究成果
The digital holographic sizer (DHS) demonstrates great potential for on-line coal powder size distribution measurement in power plant pipes, with measurement results agreeing well with those from laser particle size analyzer (LPSA). The study identifies optimal parameters for pixel size, recording distance, and particle concentration, and successfully implements a prototype DHS for practical application.
研究不足
The resolution for small particles is not high enough, and the presence of large particles can affect the recognition of small particles. The suitable particle concentration for accurate measurement is limited to under 0.5/mm3.
1：Experimental Design and Method Selection:
The study employs digital holography (DH) for particle size measurement, utilizing simulation to quantify the effects of pixel size, recording distance, particle size, and concentration. A prototype DHS is then developed based on simulation results.
2：Sample Selection and Data Sources:
Pulverized coal samples are used, with their size distributions measured by both DH and laser particle size analyzer (LPSA) for comparison.
3：List of Experimental Equipment and Materials:
The DHS consists of a suction probe, holographic measurement section, and recovery pipe. A CCD camera with a pixel size of 4.8 μm and a laser wavelength of 532 nm are used.
4：8 μm and a laser wavelength of 532 nm are used.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The system samples coal powder, records holograms in the measurement section, and recovers the sample. Holograms are reconstructed to determine particle size distribution.
5：Data Analysis Methods:
The wavelet transform reconstruction algorithm is used for numerical reconstruction of holograms, with particle size calculated based on the number of pixels occupied by the particle image.
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