Study on co-gasification of steam / CO2 / O2 with anthracite

In order to utilize the high temperature exhaust gas (steam and CO2 ) from SOFCs,the co-gasification of an- thracite with steam / CO2 / O2 were investigated using a fluidized gasification apparatus. It is found that the volume frac- tion of H2 in the syngas gradually increases while CO increases firstly and then stabilizes with the increase of steam /CO2 ratio at 900 ℃ ,which is mainly attributed to the enhancement of the rates of coal-steam reaction and water shift reaction. With the increase of O2 flowrate,the volume fraction of CO in the syngas increases firstly and then decreases. The volume fractions of CO and H2 in the syngas reach the peak value of 44. 9% when the ratio of O2 / CO2 / steam is 30 / 56 / 14 at 900 ℃ . It is further revealed that the addition of red mud can significantly improve the reaction rate of the coal-steam / CO2 / O2 co-gasification with an optimum addition of 8% ,mainly resulting from the catalytic effect of Fe2 O3 ,alkali and alkaline earth metal.