不同运行策略下燃气轮机联合循环变工况热经济性能分析  

Off-design Thermoeconomic Performance Analysis of Gas Turbine Combined Cycle Under Different Operation Strategies

作　　者：王振 段立强[1] WANG Zhen;DUAN Liqiang(School of Energy Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2021年第14期4912-4922,共11页Proceedings of the CSEE

基　　金：国家科技重大专项项目(2017-I-0002-0002)。

摘　　要：燃气轮机联合循环发电已成为当前火力发电的主要发展方向之一。基于热经济学结构理论建立了燃气轮机联合循环成本模型,分析不同燃机运行策略对燃气轮机联合循环机组单位产品热经济学成本的影响,并引入评价指标对燃气轮机联合循环进行技术经济性分析。分析了天然气价格和非能源成本对各组件的单位产品热经济学成本的影响。结果表明,调节燃机运行策略可以降低机组的单位产品热经济学成本。通过分析各个组件的性能评价指标值,结果表明,对于压气机和蒸汽轮机,减少投资成本是主要改进方向,对于燃烧室通过提高燃烧室的燃烧效率,减少燃料化学能与烟气热能转换损失来降低由于不可逆损失引起的负熵成本。通过灵敏度分析,结果表明,天然气价格的变化对燃烧室的单位热经济学成本影响最大,而非能量成本对压气机,燃气透平和蒸汽轮机的单位热经济学成本影响最大。Gas turbine combined cycle power generation has become one of the main development directions of current thermal power generation.The cost model of gas turbine combined cycle was established based on the thermoeconomic structural theory,the influences of different gas turbine operation strategies on the unit thermoeconomic cost of product of gas turbine combined cycle unit were analyzed.And,the evaluation analysis of the gas turbine combined cycle was performed based on the evaluation index.The effects of natural gas prices and non-energy costs on the thermoeconomic costs of each component were analyzed.The results show that changing the gas turbine operation strategy can reduce the unit thermoeconomic cost of product.By analyzing the performance evaluation index values of each component,the results show that for the air compressor and steam turbine,reducing investment costs is the main improvement direction.For the combustion chamber,the cost of negative entropy due to irreversible losses can be reduced by improving the combustion efficiency of the combustion chamber and reduce the energy conversion loss from the fuel chemical energy to thermal energy of flue gas.Through sensitivity analysis,the results show that the change of natural gas’s price has the greatest impact on the unit thermoeconomic cost of the combustion chamber,and non-energy costs have the greatest impact on the unit thermoeconomic cost of the air compressor,gas turbine and steam turbines.

关 键 词：燃气轮机联合循环 热经济学结构理论 单位热经济学成本 燃机运行策略 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]