Fluidization Characteristics of the Dense Gas-Solid Fluidized Bed Separator Based on the Mixed-Medium Solids of Magnetite and Paigeite Powder
Fluidization Characteristics of the Dense Gas-Solid Fluidized Bed Separator Based on the Mixed-Medium Solids of Magnetite and Paigeite Powder
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DOI：
10.1080/19392699.2013.790818
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发表时间：
2013-04
影响因子：
2.1
通讯作者：
Jing-feng He;Yuemin Zhao;Yaqun He;Z. Luo;C. Duan
中科院分区：
文献类型：
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作者：
Jing-feng He;Yuemin Zhao;Yaqun He;Z. Luo;C. Duan
采用数值模拟与实验验证相结合的方法，研究了磁铁矿与斑铁矿混合粉料的流态化特性，以优化气固流化床分离机介质固体的设计。实验结果表明，当沸石粉在混合物中的重量比为25%≤α≤35%时，沸石粉的流化性能较好，床层密度的相对偏差为Δρ≤0.025 g/cm3。通过选择合适的数学模型和参数，得到了相应的仿真结果。混合固体流化床具有良好的流化性能和稳定的密度分布。采用实验室规模的DGSFBS对粒度为13 ~ 6 mm、灰分为33.43%的原煤进行了分选实验。当参数α = 30%时，粉煤灰含量由33.43%降至11.63%，可能误差为0.07，回收率为98.59%。单独使用磁铁矿粉或辉钼矿粉效果不佳；然而，随着混合固体的使用，DGSFBS的流化性能和分离效率得到了提高。
Fluidization characteristics of the mixed magnetite and paigeite powder were studied by the combination approach of numerical simulation and experimental verification to optimize the design of the medium solids used in the dense gas-solid fluidized bed separator (DGSFBS). The experimental results showed that the favorable fluidization performance could be achieved with the weight proportion of paigeite powder in the mixture 25% ≤ α ≤ 35%, while the relative deviation in the bed density should be Δρ ≤ 0.025 g/cm3. The corresponding simulation results were obtained by selecting suitable mathematical models and parameters. It also indicated that the fluidized bed with mixed solids could provide a good fluidization performance and stable density distribution. The laboratory-scale DGSFBS was used to conduct the separation experiments on raw coal with size range of 13–6 mm and ash content of 33.43%. With the parameter α = 30%, the experiment resulted in the coal ash content being reduced from 33.43% to 11.63% with a probable error, E P of 0.07 and a recovery efficiency of 98.59%. Utilization of either magnetite or paigeite powder alone was not effective; however, fluidization performance and separation efficiency of DGSFBS improved with the utilization of mixed solids.