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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

PROSPECT OF COAL PYROLYSIS UNDER HYDROGEN-RICH GASES

Bao-Qing Li
Institute of Coal Chemistry Chinese Academy of Sciences

Hongqiang Liao
State Key Laboratory of Coal Conversion Institute of Coal Chemistry

Abstract

Pyrolysis of Chinese high sulfur bituminous coal and lignite under hydrogen-rich gases such as real coke-oven gas (COG) and synthesis gas (SG) is carried out at pressures of 0.1-5 MPa with heating rate ranging from 5-25 K/min up to final temperature 923K in a fixed-bed reactor. The results are compared with those in pyrolysis under hydrogen and nitrogen. Higher pressure and slower heating rate are helpful to increase the quality and quantity of tar and to improve the removals of sulfur and nitrogen. Compared with hydropyrolysis (HyPy) at the same total pressure, the conversions and tar yield from pyrolysis with COG and SG are always lower than those from HyPy, but the yields of BTX and Desulfurizations are almost equal. At the same hydrogen partial pressure, all the yields of tar, BTX, PCX and naphthalene, and desulfurization from pyrolysis with COG and SG increase significantly with enhancing unwanted water. The results reveal that there are interactions among H2, CH4 and CO in pyrolysis under COG and SG. This study demonstrates that pyrolysis under hydrogen-rich gases may provide a possible way for effective conversion of high sulfur coal.