摘要
汽耗变换系数和抽汽等效焓降是不同于热耗变换系数和抽汽效率的另 2个抽汽特性参数 ,它们随抽汽压力而异 ,从另外一个角度反映了抽汽的品位特征。有再热的热力系统抽汽等效焓降有 2个 ,一个是定流量等效焓降另一个是定热量等效焓降 ,两者都只与热力系统节点的参数有关。文中同时给出了计算汽耗变换系数ki、定热量等效焓降Hi 和定流量等效焓降H0i 的线性方程组 ,并以 30 0MW机组热力系统为例进行了说明。借助于主循环的概念及主循环的汽耗率dM,使汽耗变换系数和定流量等效焓降相关联 ,并且通过严格的数学推导证明了ki/H0i=dM,该式不但说明了ki 和H0i 的关系 ,而且也说明主循环的汽耗率只与热力系统节点参数有关。最后以 30
Both the steam rate transformation coefficient and extraction equivalent enthalpy drop are extraction performance parameters which are different from the heat rate transformation coefficient and the extraction steam efficiency . They vary with extraction pressure, and reveal the grades of bled steam from another point of view. In thermodynamic system with reheating, There are two extraction equivalent enthalpy drops one is equivalent enthalpy drop with fixed flow, The other is equivalent enthalpy drop with fixed heat. Both are related to the parameters of nodes in the thermodynamic system. In this paper, The linear equations calculating the steam rate transformation coefficient k i , equivalent enthalpy drop with fixed heat H i and equivalent enthalpy drop with fixed flow H 0 i are described, and an instance of thermodynamic system of 300MW unit is given. By the concept of main cycle, The steam rate transformation coefficient is connected with equivalent enthalpy drop with fixed flow. And the equation k i/H 0 i=d M , which not only illustrates the relationship between k i and H 0 i , but also explains that the steam consumption of main cycle is only related to node parameters of the thermodynamic system, is proved by mathematics derivation strictly. The parameters are calculated and analyzed in designed condition of 300MW unit.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第2期93-98,共6页
Proceedings of the CSEE
关键词
电厂
热力系统
汽耗率
热力循环
汽耗变换系数
抽汽等效焓降
thermodynamic system of a coal fired power plant
steam rate
thermodynamic cycle
steam rate transformation coefficient.
