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Indexed by:期刊论文

Date of Publication:2018-01-15

Journal:FUEL

Included Journals:SCIE、EI

Volume:212

Page Number:448-454

ISSN No.:0016-2361

Key Words:Coal hydroliquefaction residue; Pyrolysis; Fluidized bed; Caking

Abstract:To utilize the coal hydroliquefaction residue (CHR), a dual loop reaction system (DLRS) has been developed and upon which the pyrolysis of CHR was conducted under atmospheric pressure. The DLRS combines three reactors, i.e. a fluidized bed pyrolyzer, a radial-flow moving bed filter and a riser combustor followed by a particles grading cyclone. These three reactors form two parallel circulating loops, i.e. pyrolysis loop and filtration loop with small and big quartz sand particles as circulating bed materials, respectively. CHR mixed with quartz sand was injected into the fluidized bed pyrolyzer rapidly by a gas driven feeder, which makes it possible to dispose the CHR continuously. Under optimized blending ratio of CHR/quartz sand (1:4) and pyrolysis temperature from 500 degrees C to 550 degrees C, a dust-free pyrolysis tar with the yield of 20 wt% could be obtained, which was about two times of the Fischer Assay yield. The hexane soluble part (HS) and the hexane insoluble but toluene soluble part (asphaltene, A) account for nearly 94 wt% of the tar. Almost all the HS in the CHR was transferred into the tar during the pyrolysis.