期刊
ENERGY CONVERSION AND MANAGEMENT
卷 237, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2021.114122
关键词
Supercritical water gasification; Coal; Kinetics; Molecular dynamics; Sulfur and nitrogen transformation
资金
- National Natural Science Foundation of China [52076071]
- Changsha Municipal Natural Science Foundation [kq2007031]
- Key Projects of Hunan Province Science and Technology Plan [2018SK2019]
Supercritical water gasification of coal is a promising clean coal conversion technology with advantages such as high efficiency and reduced emissions. However, achieving complete gasification at low temperatures remains a challenge, which can be addressed through factors like temperature, oxidant, and catalysts.
Supercritical water gasification (SCWG) of coal is a new clean coal conversion technology. Due to the unique properties of supercritical water, SCWG has many advantages compared with other coal gasification technologies, such as higher gasification efficiency, higher H2 yield, and less NOX, CO2 and SOX emission. However, how to realize the complete gasification of coal in supercritical water at low temperature is a huge challenge. Through experimental and kinetic studies, it is found that temperature is a determining factor of SCWG of coal. There is no nitrogen-containing gas in gaseous products and H2S is the only sulfur-containing gas in gaseous products. The temperature for complete gasification can be reduced by using oxidant or catalyst. The molecular dynamics simulation shows that there is a virtuous cycle in the SCWG process of coal through the formation and extinction of H radical-rich water clusters. In addition to the challenges mentioned above, as a competitive and promising technology, there are still many other challenges to be solved for supercritical water gasification coal, such as corrosion problem of the SCWG reactor, high cost and system amplification method.
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