A 10 kWth interconnected fluidized bed reactor (air reactor and fuel reactor) for chemical looping combustion was designed and built.The experiments on chemical looping combustion of biomass (sawdust) with NiO/Al2O3 oxygen carrier were performed in this reactor.The effects of fuel reactor temperature and steam/biomass ratio (S/B) on the gas composition of both fuel reactor and air reactor

combustion efficiency

etc.

were discussed.The results indicated that the fuel reactor temperature was an important factor which affected the process of chemical looping combustion.With the increase of fuel reactor temperature

CO2 content increased

and CH4 content decreased evidently.CO content increased remarkably with increasing fuel reactor temperature in the temperature range 720—820℃

and reached its maximum at the temperature 820℃

and then decreased remarkably after the fuel reactor temperature exceeded 820℃.A higher fuel reactor temperature would contribute to increasing combustion efficiency.With the increase of steam/biomass ratio

CO and CH4 content increased

CO2 content and combustion efficiency decreased accordingly. In a total continuous operation time of 100 h

the oxygen carrier which was prepared by using impregnation exhibited extremely good oxidation-reduction reactivity and strong recycling ability.It was an ideal oxygen carrier for chemical looping combustion of biomass.