Density-based segregation/separation performances of dense medium gas–solid fluidized bed separator (DMFBS) for coal cleaning and upgrading
Density-based segregation/separation performances of dense medium gas–solid fluidized bed separator (DMFBS) for coal cleaning and upgrading
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DOI：
10.1016/j.jtice.2015.07.031
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发表时间：
2016-02
影响因子：
5.7
通讯作者：
Jing-feng He;Mingbing Tan;Yuemin Zhao;Ran Zhu;C. Duan
中科院分区：
文献类型：
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作者：
Jing-feng He;Mingbing Tan;Yuemin Zhao;Ran Zhu;C. Duan
重介质气固流化床分选技术（DMFBS）是一种新型的煤炭分选技术。研究了所用重介质（磁铁矿粉）的特性，分析了入炉煤样的可选性。设计了双层稳压布风板，保证了床层的均匀布风。研究了流化床压降ΔPB、床层整体稳定性、床层密度波动等流化特性，结果表明，在适宜的气速下，流化床具有良好的流化稳定性和均匀的密度分布，有利于煤的分选。DMFBS的分离性能主要取决于操作气速。在U = 1.6Umf条件下，不同粒度煤的Sash值分别为0.65、0.68、0.72和0.75。实验室规模的分离器将3-25 mm粒度的煤的灰分含量从39.56%降低到10.96%，并且将硫含量从1.07%降低到0.41%。在分选密度分别为1.605、1.69、1.76和1.83 g/cm ~ 3时，分选的概率误差EP值分别为0.075、0.070、0.060和0.058 g/cm ~ 3，分选效果显著。
Dense medium gas–solid fluidized bed separator (DMFBS) is recognized as a new, alternative technique for coal cleaning and upgrading. Characteristics of the used dense medium (magnetite powder) were studied, and washability of the feeding coal sample was analyzed. A double-layer, stable-pressure air distributor was designed to ensure uniform air distribution for the bed. Fluidization characteristics, including bed pressure drop ΔPB, overall stability of the bed, fluctuation of the bed density, were investigated and the results indicate that the bed can provide favorable fluidization stability and uniform density distribution with suitable gas velocities that allow for coal separation. Segregation/separation performances of DMFBS are mainly dependent on operating gas velocity. Density-based segregation occurred, with optimum segregation efficiencySashvalues of 0.65, 0.68, 0.72 and 0.75 were achieved atU= 1.6Umffor various sized coals. The laboratory-scale separator reduced the ash content from 39.56 to 10.96% and rejected sulfur content from 1.07 to 0.41% for 3–25 mm sized coal. The probable errorEPvalues of 0.075, 0.070, 0.060 and 0.058 g/cm3were obtained at the separating densities of 1.605, 1.69, 1.76 and 1.83 g/cm3, respectively for various sized coals, indicating that a notable separation performance was achieved.