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A comparison between CO 2 gasification of various biomass chars and coal char
Author(s) -
Hu Yuyan,
Yu Hangqin,
Zhou Fanglei,
Chen Dezhen
Publication year - 2019
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23417
Subject(s) - char , pyrolysis , coal , syngas , biomass (ecology) , thermogravimetric analysis , waste management , yield (engineering) , sewage sludge , chemical engineering , chemistry , pulp and paper industry , materials science , organic chemistry , metallurgy , catalysis , geology , sewage treatment , oceanography , engineering
In this paper, municipal solid waste (MSW), sewage sludge (SS), and rice straw (RS) were pyrolyzed under N 2 atmosphere and at 550 and 600 °C, and then the produced biochars were used for gasification in a CO 2 atmosphere. The effects of pyrolysis temperature, gasification temperature, and CO 2 /C ratio on the product composition and yield were studied. The results were compared with those from coal char gasification. The CO 2 gasification kinetics were determined under CO 2 flow by thermogravimetric analysis (TGA). CO concentration in the syngas of the gasification experiments can be organized in the following order: MSW char > RS char > SS char > coal char. Considering the energy consumption and CO yield, the recommended gasification temperature for the biomass chars is 900 °C. The activation energies of CO 2 gasification calculated from the TGA data based on the most fitted reaction models can be organized in the following order: coal char > RS char > SS char > MSW char, which is consistent with the experimental results. For higher syngas field and lower CO 2 /C ratio, MSW char is recommended as the best feedstock for in the combined pyrolysis‐gasification process.