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›› 2002, Vol. 2 ›› Issue (5): 0-0.

• 5 •    

X射线投影成像法测量气固流化床中的固含分布?I 原理及图像处理方法

张志攀, 刘会娥, 罗国华, 汪展文, 魏飞   

  1. 清华大学化工系，北京100084
  • 出版日期:2002-10-20 发布日期:2002-10-20

Portable X-ray Photography of Solid Concentration in Gas–Solids Fluidized Beds — (I) Principle and Image Processing

ZHANG Zhi-pan, LIU Hui-e, LUO Guo-hua, WANG Zhan-wen, WEI Fei   

  1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Online:2002-10-20 Published:2002-10-20

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摘要： X光成像和CT在医疗、工业等领域获得了广泛的应用. 本文在轴对称假设的条件下，将X光成像系统用于测量气固流化床固含分布. 使用新型X光探测器和改进后的回归算法对投射图像进行重构还原，得到流化床中径向颗粒浓度分布.

关键词: X光成像, 流化床, 固含分布, 图像处理

Abstract: Presuming axial symmetry for the solid concentration, the portable X-ray photography technique was improved and applied to measure the radial solid concentration in a riser of a circulating fluidized bed. The principle and image processing are briefly introduced. Twenty to thirty images with 100~200 ns X-ray pulses were processed to get a time-averaged concentration profile. The main steps of this technique include getting photos, deducting the background, calibrating mass thickness map, and regressing calculation. As a demonstration, the radial profile of solid concentration in a f192 mm riser was determined and compared with correlations in the literature.

Key words: X-ray, fluidized bed, solid concentration, image processing

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