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Oxy‐fuel co‐combustion performances and kinetics of bituminous coal and ultra‐low volatile carbon‐based fuels
Author(s) -
Wang Chang’an,
Feng Qinqin,
Mao Qisen,
Wang Chaowei,
Li Guangyu,
Che Defu
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5871
Subject(s) - bituminous coal , combustion , coal , waste management , carbon fibers , environmental science , chemistry , materials science , organic chemistry , engineering , composite number , composite material
Summary The co‐firing of bituminous coal under oxy‐fuel conditions is a feasible measure to improve the ignition and combustion performances of ultra‐low volatile carbon‐based fuels and effectively control pollutants. The present study aimed at the co‐combustion performances and kinetics of bituminous coal and ultra‐low volatile carbon‐based fuels under oxy‐fuel condition by means of thermogravimetric experiments. The results indicate that the volatile content in fuels is likely to affect the ignition temperature and the oxy‐fuel co‐firing of bituminous coal accelerates the ignition and advances combustion of ultra‐low volatile fuels. The combustion behaviors of individual fuel are retained in the co‐firing process to a large extent, and there is a slight synergy at the 350 to 950°C temperature range. Enhancing the oxygen concentration is effective to improve the combustion performances of ultra‐low volatile fuels in oxy‐fuel atmosphere. The apparent activation energy of residual carbon from coal‐water‐slurry gasification in oxy‐fuel atmosphere exceeds that from fluidized bed gasification, which is highly related to gasification technology and raw fuel properties. The apparent activation energy under condition of co‐firing bituminous coal and residual carbon from coal‐water‐slurry varies considerably, changed from 100 to 46 kJ/mol. Therefore, the addition of bituminous coal significantly reduces the activation energy of ultra‐low volatile fuels to improve the co‐firing performances. Based on the present investigation, a better understanding on the oxy‐fuel co‐firing of various carbon‐based solid fuels is obtained, thereby promoting the efficient and clean utilization of solid waste in the coal chemical industry.