摘要
凝结水节流参与火电机组负荷调节,能够有效利用机组蓄能提高负荷响应速率,同时不会造成热效率降低和厚壁金属热应力增加。依据质量守恒和能量守恒定律,建立汽轮机低压加热器、除氧器动态模型,阐明了凝结水节流导致汽轮机功率增加的机理。并针对一600 MW典型机组,依据其设计参数分析这一过程的静态、动态特性,最终得到了凝结水流量变化与机组负荷变化之间的传递函数。凝结水节流释放机组蓄热的总量及速度与主蒸汽节流大致相同,在机组协调控制系统设计中引入此方案,可以提高机组变负荷过程中主要参数的稳定性。
By condensate throttling to regulate the thermal power unit load, the store energy of the unit can be utilized effectively and the load response rate of the unit can be improved. Meanwhile this method cannot decrease unit thermal efficiency and cannot increase the thick - walled metal heat stress. According to the law of mass conservation and the law of energy conservation, the dynamic model of low - pressure heater and deaerator are constructed. And then the mechanism of condensate throttling for increasing turbine power is explained. For a 600 MW typical unit, according to the design parameters the-static and dynamic characteristics of the process are analyzed, and finally the transfer function of condensate water flow versus units load is gained. The amount and the velocity of the unit releasing store energy by condensate throttling and by main steam throttling are approximately same. If this .scheme is introduced in unit coordinated control system design, the stability of the unit main parameters on the variable load process wilt be improved.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2009年第2期80-84,共5页
Journal of North China Electric Power University：Natural Science Edition
基金
国家自然科学基金资助项目(50776030)
关键词
能源与动力工程
火电机组
凝结水节流
负荷调节
动态模型
energy and power engineering
thermal power units
condensate throttling
load regulation
dynamic model
