Chemical looping combustion (CLC) is a novel combustion technology with inherent separation of the greenhouse gas CO2.The feasibility of using NiO as an oxygen carrier during chemical looping combustion of coal was investigated at 800—960℃.The experiment used a laboratory fluidized bed as the reactor

where steam acted as the gasification-fluidization medium.The reaction between oxygen carrier and solid fuel occurred via the gasification intermediates

primarily CO

H2 and CH4.The oxygen carrier particles exhibited high reactivity above 900℃.The flue gas component variation as a function of reactor temperature and reaction time was discussed

respectively.With increasing CO2 generation rate as the result of increased reactor temperature

C residual rate decreased correspondingly.At 800—960℃

CO2 concentration (dry basis) in flue gas presented a monotone increasing curve

and CO

H2 and CH4 concentrations (dry basis) decreased monotonously.The variation of CO2

CO

H2 and CH4 generation rates in exhaust gas as a function of reaction time presented a parabolic curve

respectively.Moreover

the peak value of H2 generation rate was less than the value of CO.With an increase in reactor temperature

CO2 generation rate increased remarkably

while CO

H2 and CH4 generation rates decreased rapidly.The reaction between oxygen carrier and solid fuel

or overall coal gasification was accomplished in nine minutes above 900℃

and CO2 concentration was greater than 92%.