Dry cleaning of fine lignite in a vibrated gas-fluidized bed: Segregation characteristics

Zhao, Peng; Zhao, Yuemin; Chen, Zengqiang; Z, Luo

doi:10.1016/j.fuel.2014.11.029

Cited by 51 publications

(11 citation statements)

References 29 publications

(35 reference statements)

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“…As discussed above, the main unsolved problems associated with the recovery of fine medium solids hinders the development of the modified ADMFB cleaning. Some research works attempted to clean –6+1 mm fine coal based on the density segregation phenomenon in a gas‐fluidized bed. Density‐segregation gas‐fluidized bed cleaning does not use an external dense medium and clean coal fines depending on the difference in hindered settling velocities during fluidization.…”

Section: Density‐segregation Gas‐fluidized Bed Cleaningmentioning

confidence: 99%

Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review

Yang

Zhao

2017

Chem Eng & Technol

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Dry cleaning of coal becomes increasingly significant to improve energy efficiency and reduce air pollutant emissions. Fine coal dry cleaning processes are mostly based on gas‐solid two‐phase flow and mainly classified into the following three categories. Modified air‐dense medium‐fluidized bed cleaning has high cleaning accuracy, but confronts the problems of product purification and medium recovery. Density‐segregation gas‐fluidized bed cleaning does not use artificial medium solids and is characterized by a simple process and stable performance. However, its cleaning accuracy is relatively low. Air table cleaning also uses no artificial medium and separates fine coal depending on the differences in density and coefficient of friction. Its cleaning accuracy is approximate to that of density‐segregation gas‐fluidized bed cleaning but has more influential factors.

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Section: Density‐segregation Gas‐fluidized Bed Cleaningmentioning

confidence: 99%

Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review

Yang

Zhao

2017

Chem Eng & Technol

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“…The pneumatic table was also used for dry separation of mixture of plastics (Dodbiba et al 2005). Zhao et al studied on degree of segregation of fine lignite in a vibrated gas-fluidized bed (Zhao et al 2015). Theoretical considerations show that effective separation in a table can be achieved when the time of free fall could be minimized (Osborne 1988;Haider and Levenspiel 1989;Zhao et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Enrichment of carbon recovery of high ash coal fines using air fluidized vibratory deck separator

Sahu

Dey

2017

Int J Coal Sci Technol

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Coal is primarily beneficiated by wet gravity methods. The wet processing of coal is an efficient practice. However, it introduces the moisture in the range of 6%-15%, depending upon the size of coal which is as detrimental as ash content to the heating value of coal. Dry beneficiation of coal fines was carried out using an air fluidized vibrating table in which the coal particles get separated from the heavier mineral particles as a result of horizontal and vertical stratification. Two level factorial design matrix was used to optimize and assess the interactive effects of the operational parameters of a pneumatic table viz. deck eccentric, side tilt and air flow rate on the clean coal yield and its ash content. Double stage processing was found to be more effective for reducing the ash content of the clean coal. Initial stage of processing at a higher ash level generates a reject of high ash with low combustibles. Cleaning of the rougher concentrate at 34%-35% ash level shows significant improvement in the organic efficiency (88.6%) and useful heat value of clean coal (15690 kJ/kg). The performance of air fluidized vibrating deck was measured by E p value which is 0.18.

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“…Numerous coal cleaning technologies associated to de-watering [6][7][8][9][10] and de-ashing [11][12][13][14] processes have been proposed to sustainably utilize these lignites. However, most of them were not yet widely practiced by the power industry considering the high consumption of energy required during cleaning processes.…”

Section: Introductionmentioning

confidence: 99%