On the basis of the Aspen plus software

the model of the integrated chemical looping air separation(CLAS)-IGCC system were established to provide reliable comparisons between the conventional IGCC system and the proposed CLAS-IGCC system.By using steam as the CLAS oxygen-media gas

the effects of operating parameters such as superheat degree

oxygen-to-carbon ratio

steam-to-carbon ratio

and oxygen carrier on the CLAS-IGCC system performances were discussed.The results show that

the efficiency of the CLAS-IGCC system decreases at first and then increases with the rising steam superheat degree

and it reduces with the increasing oxygen-to carbon ratio.The steam-to-carbon ratio has little influence on the system efficiency.The CLAS-IGCC system applying CoO-Co_3O_4 as the oxygen carrier has better performance than the one using Mn_3O_4-Mn_2O_3 as the oxygen carrier.The efficiency of the CLAS-IGCC system is 45.1%

while that of the IGCC system employing the conventional air separation technology is 45.8%.Therefore

the steam-typed CLAS-IGCC system has no advantages.