Comparison of Lurgi and SHELL coal gasification technologies

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Wang Naiji, Xu Zhengang and others from the Beijing Coal Chemical Research Branch of the General Research Institute of Coal Science wrote in the article "Analysis of Syngas Production from Lurgi and Shell Coal Gasification" that "based on the typical material balance used by the American Electric Power Research Institute and the Synthetic Fuels Association when evaluating gasification methods, it was calculated that the gasification efficiencies of Lurgi and Shell were 79.96% and 80.23% respectively under the same conditions of the same raw material coal properties (both use Illinois 6# coal as raw material).； The theoretical effective hydrogen (including CH4 conversion) yields (both daf base) are 0.1837kg/kg and 0.1866kg/kg respectively. Obviously, the main technical indicators of the two processes are very close. However, the specific oxygen consumption (including CH4 conversion) of Shell is significantly higher than that of Lurgi (0.6838m3/kg and 0.4817m3/kg respectively, the former is 41.95% higher than the latter). ” How do you understand it? The article "Analysis of Syngas Production from Lurgi and Shell Coal Gasification" can be found in the article sharing area: http://bbs.hcbbs.com/viewthread.php?tid=55576&pid=601682&page=1&extra=#pid601682