1000MW机组加装回热汽轮机的经济性研究  

Research on Thermoeconomics of Applying Regenerative Back Pressure Turbine in 1000 MW Unit

作　　者：郭俊[1] 穆祺伟 韩小渠 刘继平[2] 

机构地区：[1]西北电力设计院 [2]西安交通大学动力工程多相流国家重点实验室

出　　处：《电站系统工程》2016年第2期1-4,8,共5页Power System Engineering

摘　　要：针对1000 MW机组再热热段过热度高、相应回热加热器内不可逆损失大的现状,提出了加装回热小汽轮机的方案,并与传统加装蒸汽冷却器的方案进行了热经济性和技术经济性的对比。理论计算表明:当回热汽轮机相对内效率为0.9时,采用回热汽轮机节能效果为0.546 g/k Wh,而采用外置式蒸汽冷却器的节能效果为0.522 g/k Wh;加装回热汽轮机方案的平均投资利润率为40.52%,全投资回收期为2.47年,而加装蒸汽冷却器的平均投资利润率为30.35%,全投资回收期为3.3年。因此,采用回热小汽轮机替代给水泵汽轮机的方案的在热经济性和技术经济性方面均优于加装蒸汽冷却器的方案,是提高机组经济性的有效手段。To solve the problem of superheat temperature of the reheat steam increases and the irreversible loss inside the corresponding regenerators becomes larger in the 1000MW unit, a method of applying regenerative back pressure turbine （RBPT） after the high pressure cylinder is put forward. It is compared with the traditional method of applying steam coolers （SC） in thethermoeconomics performance and technological economicalperformance.Calculation results show that the installationof the external type of SC candecrease the coal consumption rateat 0.522g/kWh, while the corresponding energy-saving is 0.546 g/kWh when the relative internal efficiency of the RBPT is 0.9. The average profit rate of the installation of SC is 30.35 % and thefull payback period is 3.3 years, while that of the installation of RBPT is 40.52 % and 2.47 years.

关 键 词：蒸汽冷却器 回热汽轮机 热经济性 技术经济性 

分 类 号：TK267[动力工程及工程热物理—动力机械及工程]