Details

Autor(en) / Beteiligte

• He, Jingfeng
• Tan, Mingbing
• Zhao, Yuemin
• Duan, Chenlong
• He, Yaqun
• Luo, Zhenfu

Titel

Fluidization characteristics and density-based separation of dense-medium gas–solid fluidized bed: An experimental and simulation study

Ist Teil von

• Journal of the Taiwan Institute of Chemical Engineers, 2016-04, Vol.61, p.223-233

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2016

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• •Experiment and simulation were used to study fluidization characteristics of DMGFB.•Key factors in determining fluidization stability of DMGFB were studied.•Stability-region for DMGFB was experimentally and simulated analyzed.•A successive dry separation flowsheet was utilized to obtain low-ash clean coal. Experimental and simulation approaches were combined to investigate the fluidization characteristics of a dense-medium gas–solid fluidized bed (DMGFB) for coal cleaning. Results indicated that the static bed height should be adjusted by maintaining a stable height of 150–300 mm to avoid its harmful effect on fluidization stability. Bed pressure drops presented favorable stability with slight fluctuations at a superficial gas velocity of 11.68 cm/s (1.6 Umf). The uniform density distributions with slight variations throughout the whole bed were verified by comparing the experimental, simulated and calculated results. A fluidization index, Umb/Umf, was used to conduct stability-region analysis for DMGFB. On the basis of fluidization stability, a successive beneficiation flowsheet via a DMGFB separator was used to perform density-based separation of 6–50 mm sized run-of-mine coal. Results demonstrated that the low-ash clean coal with a yield of 61.36% was efficiently obtained with the ash content reduced from 39.64% to 10.18% and sulfur content rejected from 1.36% to 0.85%. Probable error E values were 0.06 and 0.075 g/cm3 in high- and low-density separation stages, indicating efficient separation performance. The dry coal beneficiation technique has great potential for utilization in arid and water-deficient areas and countries. [Display omitted]