Simulation And Analysis On Coal Gasification-chemical Looping Combustion Combined Cycle System On Aspen Plus

As CO₂ is the main influence factor of the most which causes the greenhouse effect, the reduction of its emissions has become a research topic connected with sustainable development of energy and environment in future.fossil fuels(coal,oil,natural gas and etc) combustion is the most resource of carbon oxide produced by human activities. Coal slurry is gasificated in the pressurized entrained-bed gasifier by absorbing heat of few coal combustion,the syngas out of gasifier serve as fuel in FR.High-pressure air out of air compressor react with the reduction of oxygen carriers in AR,out of which high temperature and pressure oxygen-diluted air do work in gas turbine.after that,steam is produced in HRSG by full use of the gas heat,and the steam do work in steam turbine. The coal gasification-chemical looping combustion combined cycle system uses coal slurry as fuel,and NiO/NiAl₂O₄ as oxygen carrier.In which gasification furnace,CLC-GT and HRST are modeled and researched on Aspen plus. The law of AR temperature,afterburning temperature and cold air rate impacting on net system performance is analyzed.Under the best operating conditions, Performance indicators are obtained.The results show that net efficiency of system can achieve about 39.9%,capture rate of CO₂ is 93.2%,CO₂ emissions is 132.7g/kwh.Comparing it with the IGCC and USC system, CLC-CC system has a great advantage in CO₂ trapping and high efficiency.