火电机组作为主要的一次调频能力提供者,其锅炉主蒸汽压力模型对系统的频率响应有较大影响,锅炉参数和机组一次调频能力随工况变化而变化,而现有的一次调频模型无法反映这种特性。通过串联的换热单元等效锅炉并引入流体热容带来的延迟效...火电机组作为主要的一次调频能力提供者,其锅炉主蒸汽压力模型对系统的频率响应有较大影响,锅炉参数和机组一次调频能力随工况变化而变化,而现有的一次调频模型无法反映这种特性。通过串联的换热单元等效锅炉并引入流体热容带来的延迟效应,建立考虑流动与传热的锅炉模型,并提出基于分散控制系统(distributed control system,DCS)数据的参数在线确定方法。以某1000MW机组为例进行计算,0.2Hz频差扰动下加入锅炉模型与无锅炉模型的一次调频60s积分电量相差733.5kW×h。机组调频能力与锅炉热力动态密切相关,验证不同工况下机组一次调频能力的差异。该锅炉模型与参数确认方法可在扰动发生前为电网安全运行提供参考指导。展开更多
700°C double reheat advanced ultra-supercritical power generation technology is one of the most important development directions for the efficient and clean utilization of coal.To solve the great exergy loss prob...700°C double reheat advanced ultra-supercritical power generation technology is one of the most important development directions for the efficient and clean utilization of coal.To solve the great exergy loss problem caused by the high superheat degrees of regenerative steam extractions in 700°C double reheat advanced ultra-supercritical power generation system,two optimization systems are proposed in this paper.System 1 is integrated with the back pressure extraction steam turbine,and system 2 is simultaneously integrated with both the outside steam cooler and back pressure extraction steam turbine.The system performance models are built by the Ebsilon Professional software.The performances of optimized systems are analyzed by the unit consumption method.The off-design performances of optimization systems are analyzed.The results show that:the standard power generation coal consumption rates of optimization systems 1 and 2 are decreased by 1.88 g·(kW·h)^(–1),2.97 g·(kW·h)^(–1)compared with that of the 700°C reference system;the average superheat degrees of regenerative steam extractions of optimized systems 1 and 2 are decreased by 122.2°C,140.7°C(100%turbine heat acceptance condition),respectively.The comparison results also show that the performance of the optimized system 2 is better than those of the optimized system 1 and the 700°C reference system.The power generation standard coal consumption rate and the power generation efficiency of the optimized system 2 are about 232.08 g·(kW·h)^(–1)and 52.96%(100%turbine heat acceptance condition),respectively.展开更多
文摘火电机组作为主要的一次调频能力提供者,其锅炉主蒸汽压力模型对系统的频率响应有较大影响,锅炉参数和机组一次调频能力随工况变化而变化,而现有的一次调频模型无法反映这种特性。通过串联的换热单元等效锅炉并引入流体热容带来的延迟效应,建立考虑流动与传热的锅炉模型,并提出基于分散控制系统(distributed control system,DCS)数据的参数在线确定方法。以某1000MW机组为例进行计算,0.2Hz频差扰动下加入锅炉模型与无锅炉模型的一次调频60s积分电量相差733.5kW×h。机组调频能力与锅炉热力动态密切相关,验证不同工况下机组一次调频能力的差异。该锅炉模型与参数确认方法可在扰动发生前为电网安全运行提供参考指导。
基金financially supported by National key research and development program of China(No.2017YFB0602101,2018YFB0604404)。
文摘700°C double reheat advanced ultra-supercritical power generation technology is one of the most important development directions for the efficient and clean utilization of coal.To solve the great exergy loss problem caused by the high superheat degrees of regenerative steam extractions in 700°C double reheat advanced ultra-supercritical power generation system,two optimization systems are proposed in this paper.System 1 is integrated with the back pressure extraction steam turbine,and system 2 is simultaneously integrated with both the outside steam cooler and back pressure extraction steam turbine.The system performance models are built by the Ebsilon Professional software.The performances of optimized systems are analyzed by the unit consumption method.The off-design performances of optimization systems are analyzed.The results show that:the standard power generation coal consumption rates of optimization systems 1 and 2 are decreased by 1.88 g·(kW·h)^(–1),2.97 g·(kW·h)^(–1)compared with that of the 700°C reference system;the average superheat degrees of regenerative steam extractions of optimized systems 1 and 2 are decreased by 122.2°C,140.7°C(100%turbine heat acceptance condition),respectively.The comparison results also show that the performance of the optimized system 2 is better than those of the optimized system 1 and the 700°C reference system.The power generation standard coal consumption rate and the power generation efficiency of the optimized system 2 are about 232.08 g·(kW·h)^(–1)and 52.96%(100%turbine heat acceptance condition),respectively.
