Ni载体整体煤气化链式燃烧联合循环性能

Performance investigation of Ni-based CLC gasification combined cycle

Chemical looping combustion(CLC)offers a possibility of separating the greenhouse gas CO2.An integrated gasification combined cycle based on CLC is discussed in this paper.In the system,NiO/NiAl2O4 is used as the CLC oxygen carrier and Texaco gasification process is selected.The system performance is simulated by using ASPEN software tool.The system efficiency is 39.61%HHV(41.55%LHV)and CO2 emission is 126 g·kW-1·h-1,assuming compressor pressure ratio 17,air reactor outlet temperature 1200℃,turbine inlet temperature(TIT)1350℃ after supplementary firing,and cooling air fraction 12%.At TIT 1350℃,CO2 capture rate increases by about 23% and system efficiency decreases from 40.3% to 39.61% when the air reactor outlet temperature rises from 1000℃ to 1200℃.With the increase of TIT after supplementary firing from 1200℃ to 1500℃,system efficiency increases from 37.4% to 40.8% and CO2 emission rises from 3 g·kW-1·h-1 to 202 g·kW-1·h-1.At a specific TIT there exits an optimum pressure ratio and the optimum pressure ratio goes up as TIT rises.