Study on a gas-steam combined cycle system with CO2 capture by integrating MCFC
This paper studies a gas-steam combined cycle system with CO2 capture by integrating the molten carbonate fuel cell(MCFC).Because the cathode of MCFC requires CO2 for the electrochemical reaction,the exhaust gas of the gas turbine can be used to provide the required CO2.After the electrochemical reaction,the CO2 concentrates at the anode of MCFC by the electrochemical process.In order to further increase the CO2 concentration in the anode exhaust gas,an O2/CO2 combustion method is applied in the afterburner of MCFC and the oxygen ion transfer membrane(ITM)provides the required O2.Since the pure oxygen is provided for combustion,the combustion products mainly contain CO2 and H2O.Without N2 being mixed in the flue gas,the energy consumption of CO2 recovery is greatly reduced.In addition,the multi-exhaust gas streams from the anode and cathode of MCFC are introduced to the heat recovery steam generator(HRSG)for the recovery of additional work and heat.With the Aspen plus software,this paper builds the model of the overall MCFC-GT hybrid system with CO2 capture and analyzes the effects of the key parameters on the performances of the overall system.The result shows that compared with the gas-steam combined cycle system without CO2 capture,the efficiency of the new system with CO2 capture does not decrease and keeps the same efficiency with the original gas steam combined cycle system(55.63%)when the carbon capture rate is 45%.When the carbon capture rate reaches up to 85%,the efficiency of the new system is about 54.96%,only 0.67 percent points lower than that of the original gas steam combined cycle system.The results of this article also show the obvious superiority of CO2 capture based the electrochemical process of fuel cell.The new system can realize the energy cascade utilization.Achievements from this paper will provide the useful reference for CO2 capture with lower energy consumption from the traditional power generation system.
Gas-steam combined cycle ITM MCFC Aspen Plus CO2 emissions
Liqiang Duan Jingnan Zhu Xiaohui Song Xinming Chen
School of Energy Power and Mechanical Engineering,National Thermal Power Engineering & Technology Research Center;Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education,North China Electric Power University,Beijing,102206,China
国际会议
桂林
英文
1-20
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）