Hydrodynamics in a circulating fluidized bed with annular furnace and six parallel cyclones |
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Authors: | Daping Shuai Xiaofang Wang Qinggang Lyu |
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Affiliation: | 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing, 100049, China;2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | Systematic measurements were conducted on a cold CFB with annular furnace and six parallel cyclones to study gas-solids flow in the annular furnace and flow non-uniformity among six cyclones.The results show that axial solids holdup in the annular furnace decreases exponentially with height,similar to the conventional rectangular furnace.The uniform transverse distribution of solids holdup suggests a good gas-solids mixing in the annular furnace.The annular furnace presents the core/double-annulus flow structure,and it results in enhanced gas-solids back-mixing than the conventional core/annulus flow structure.The gas-solids flow of the inner wall-layer and the outer wall-layer is very close at most part of the furnace height,and the wall-layer thickness decreases with height.Flow non-uniformity exists among six parallel cyclones in the annular furnace CFB.But non-uniform distribution of solids circulating rates and cyclone pressure drops show no regularity,and the flow non-uniformity is no larger than the CFBs with conventional furnace.Under typical operating conditions,the relative deviation of six solids circulating rates is 8.0%. |
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Keywords: | Circulating fluidized bed annular furnace parallel cyclones flow structure flow non-uniformity |
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