摘要
蒸汽再热后,循环的吸热平均温度得到了提高,同时减小了汽轮机低压缸的湿汽损失,使系统的循环效率得到大幅度提高,二次再热比一次再热效率要高。为了使二次再热机组获得更高的效率,采用枚举算法对再热压力进行优化,然后在此基础上对给水加热器焓升进行优化。同时为了比较不同回热级数对机组经济性的影响,设计了8级回热和10级回热两个热力系统。最后发现,通过优化再热压力与加热器焓升,二次再热机组循环效率超过49%;考虑到系统的复杂性、投资增加及运行维护的便利性,认为8级回热比10级回热经济性要好。
The mean temperature of the heat addition process is raised and moisture loss is decreased after the steam is reheated, which will increase the efficiency of the steam cycle. The efficiency of double reheat is higher than that of single reheat. Reheat pressure is optimized by enumeration algorithm to improve the efficiency of double reheat unit. Then the enthalpy rise of feed-water is optimized. In order to compare the effect of regenerator number to the economy of unit, a system with 8 regenerators and a system with 10 regenerators are designed. The result indicates that efficiency of double reheat is beyond 49% after reheat pressure and enthalpy rise is optimized. Taking into account the complexity of the system, investment and maintenance convenience,the system with 8 regenerators is more economic than 10 regenerators.
出处
《汽轮机技术》
北大核心
2015年第5期371-373,共3页
Turbine Technology
关键词
二次再热
热力系统
再热压力优化
焓升优化
double reheats
thermal system
reheat pressure optimization
enthalpy rise optimization
