摘要
回热系统是全厂热力系统的核心,它对机组和电厂的热经济性起着决定性的作用。优化回热系统是提高火电机组热经济性的重要手段之一。以汽轮机通流级结构为基础,通过级数组合寻优的方式建立了除氧器、小机汽源和汽轮机抽汽口协同优化模型。以某600 MW汽轮机组为例,验证了该模型的准确性;计算分析了除氧器和小汽轮机汽源对机组热经济性的影响,得到了除氧器和小机汽源在不同位置组合下的多种回热系统优化方案。结果表明,当未对汽轮机抽汽口优化时,仅优化除氧器和小机汽源,可使机组标准煤耗率降低约0.780 69 g/kW·h;当对除氧器、小机汽源和汽轮机抽汽口协同优化时,可使机组标准煤耗率降低约0.933 42 g/kW·h。该方法对回热系统优化设计具有一定参考价值。
Regenerative heating system is the core of the whole plant thermodynamic system, and it plays a decisive role for the thermal economy of the unit and plant. So it＇ s an important method to improve the economy of thermal power unit by optimizing the structure of regenerative heating system. A collaborative optimization model about deaerator, feed pump turbine and turbine extraction port is established, based on the flow stages structure of steam turbine, by which the best connection mode of the optimum extraction opening, deaerator and feed pump turbine is determined. The accuracy of the model is validated by taking a 600 MW steam turbine for example. The influences of deaerator and feed pump turbine on the unit thermal economy are computational analyzed, and a variety of regenerative system optimization programs has been obtained about the locations of deaerator and feed pump turbine under different location combinations. The results show that when deaerator and feed pump turbine are optimized only, the standard coal consumption rate can be decreased 0. 780 69 g/kW h; the unit standard coal consumption rate decreased 0. 933 42 g/kW h when deaerator, feed pump turbine and the steam extraction openings are optimized collaboratively. This method has certain reference value for optimizing and designing the regenerative heating system.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2014年第3期94-100,共7页
Journal of North China Electric Power University：Natural Science Edition
基金
中央高校基本科研业务费专项资金资助项目(2014MS109)
关键词
回热系统
协同优化
除氧器
小机
regenerative heating system
collaborative optimization
deaerator
feed pump turbine
