High Ash Fine Coal Dry Cleaning and Stability of Shallow Bed Dense-Phase Gas鈥揝olid Separation Fluidized Bed

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• 作者：Bo Zhang ; Yuemin Zhao ; Jianqing Wang ; Shulei Song ; Liang Dong ; Liping Peng ; Xuliang Yang ; Zhenfu Luo
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：July 17, 2014
• 年：2014
• 卷：28
• 期：7
• 页码：4812-4818
• 全文大小：404K
• ISSN：1520-5029

文摘

Fine coal dry separation technology has been one of the international research hotspots in the field of coal preparation. This article proposes the shallow bed dense-phase gas鈥搒olid fluidized bed separation technology to remove gangue from the high ash fine coal. According to the criterion of center pressure drop, the C_P value can be finally reduced by reducing the bed height, H, to decrease the bed pressure drop, 螖P_B, under the condition of a fixed gas distributor pressure drop, 螖P_D. A fluidized bed of uniform and stable density was formed. The medium of 33% fine particles showed a better performance in 鈭?+3 mm, 鈭?+2 mm, and 鈭?+1 mm fine coal separation than the medium of different fine particles content by ash segregation. A 100 mm bed height with a medium of 33% fine particles was selected to separate 鈭?+3 mm fine coal. The ash content of cleaned coal reached 9.66% under the optimized conditions, whereas the clean coal yield reached more than 77.75%. For 鈭?+2 mm fine coal, the cleaned coal yield was 82.59%, the ash content of clean coal was 10.93%, and the deash rate could reach 51.96%. The shallow bed dense-phase gas鈥搒olid fluidized bed exhibited poor liquidity and high viscosity under conditions of low gas velocities. The shallow bed dense-phase gas鈥搒olid fluidized bed (100 mm bed height) with medium containing 33% fine particles can separate the 鈭?+2 mm fine coal.