电站凝汽器补水系统的热经济性分析  

Thermo-economic Analysis for Water Make-up System of Power Plant Condensers

作　　者：胡勇[1,2] 刘吉臻[1] 曾德良[2] 孟庆伟[2] 李雅哲[2] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]华北电力大学工业过程测控新技术与系统北京市重点实验室,北京102206

出　　处：《动力工程学报》2013年第5期370-374,386,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金重点资助项目(51036002);国家重点基础研究发展计划(973)项目(2012CB215203)

摘　　要：根据小扰动理论及热经济性状态方程,对凝汽器系统特性进行了研究,分析了雾化喷洒补水方式对凝汽器真空及火电机组热效率的影响,并通过实例分析了不同补给水方式在不同补给水温度下机组热效率的变化情况.结果表明:一定温度的补给水经过喷嘴雾化处理由凝汽器喉部进入系统时,可以减少系统的冷端损失,降低火电机组的背压,提高系统的热经济性;当补给水温度升高时,ΔP逐渐降低,ΔN缓慢升高.Dynamic characteristics of power plant condenser were studied using small disturbance theory and thermo-economic state equations, during which the influence of water atomization make-up mode on both the condenser vacuum and unit efficiency was analyzed, while the variation law of unit efficiency with water make-up mode and make-up water temperature studied with actual examples. Results show that when chemical water of a certain temperature is atomized by nozzle and fed into the system through con- denser throat, the cold end loss of system may be reduced, the back pressure of unit may be lowered and the thermal economy of system may be raise with the rise of make-up water temperature, AP reduces gradually while AN rises slowly.

关 键 词：小扰动理论 热经济性 状态方程 凝汽器补水 喷嘴雾化 

分 类 号：TK212[动力工程及工程热物理—动力机械及工程]