Exergoeconomic analysis of a retrofitted natural gas based cogeneration system
Cogeneration,also known as Combined Heat and Electric power(CHP),has been common accepted as an efficient,clean,reliable and promising approach to increase the utilization efficiency of fossil fuels and decrease pollutant emissions.Natural gas based cogeneration plants are increasing dramatically in China due to its superiority in thermodynamic efficiency and environment impacts.However,this technique isnt economical enough currently because the increasing price of natural gas.Therefore,establishing appropriate optimization and evaluation methodology is drastically important.In the present study,a retrofitted natural gas based cogeneration system is presented to simultaneously produce electric power,steam and domestic hot water.The domestic water is firstly heated by turbine condensing steam and then heated by exhaust gas.Finally,the domestic water is heated to its target temperature by turbine bleeding steam or low-pressure steam generated from heat recovery steam generator(HRSG).The innovation of the novel cogeneration system is the heat utilization of turbine condensing steam and HSRG exhaust gas.The domestic hot water is heated directly by turbine bleeding steam in the original cogeneration system.The original and novel cogeneration systems are modelled and simulated with the help of Cycle-Tempo.An improved exergoeconomic analysis incorporating waste exergy cost allocation is performed to evaluate the original and novel cogeneration systems.The results achieved from the improved exergoeconomic analysis show that the unit exergy cost of steam,domestic hot water and electric power of the novel system are 2%lower,50%lower and 0.33 higher than those of the original system.A conventional exergoeconomic method,exergetic cost theory is also performed to compare with the improved exergoeconomic analysis.The results show that the unit exergy cost of domestic hot water of the novel cogeneration system is even higher than that of the original cogeneration system due to the absence of external assessment the cost of waste residue.Therefore,the improved exergoeconomic analysis is reasonable and more applicable for the presented retrofitting problem.Sensitivity analysis is performed to verify the results of exergoeconomic analysis and economic analysis.A last,a potential analysis for the maximum production of domestic hot water is performed.
Exergoeconomic analysis allocation of waste cost cogeneration system retrofit
Xianglong Luo Jiahao Hu Ying Chen Songping Mo
School of Material and Energy,Guangdong University of Technology,Guangzhou,China
国际会议
桂林
英文
1-24
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）