Effect of air equivalence ratio ER on rice husk gasification in an entrained-flow reactor at different temperatures is analyzed using exergy concept. The results show that the contribution of gas component to exergy value is as follows:CO>H2>CH4>(N2

C2H4

CO2).With ER goes up the exergy value and its efficiency increase first and then decrease for product gas

however

the residual ratio and exergy efficiency decline first and then augment for unreacted carbon. At ER 0.25 and reactor temperature 1000℃

total exergy value and exergy efficiency of product gas are 7983.95 kJ·kg-1 and 54.35%

respectively

and at ER 0.28 and temperature 1000℃

the residual ratio and exergy efficiency of unreacted carbon are 24.82% and 21.49%

respectively. Raising temperature can lift exergy value and exergy efficiency of product gas

but reduce residual ratio and exergy efficiency of unreacted carbon.