摘要
通常将凝结水泵(凝泵)变频控制逻辑设计为除氧器水位调节阀控制除氧器水位及凝泵变频器控制凝结水压力和凝泵变频器控制除氧器水位及除氧器水位调节阀控制凝结水压力2种控制方式。为了使控制具有裕量,两者均无法使凝泵变频器在最节能方式下运行。对此,对除氧器水位调节阀控制除氧器水位,凝泵变频器控制压力的控制逻辑进行了优化,并应用于华能上海石洞口第二电厂4号机组。结果表明,4号机组负荷在480MW以上以除氧器水位调节阀全开及凝泵变频控制水位方式控制,可降低除氧器水位调节阀节流损失,节能效果更好。同时,避免了因低压加热器疏水泵跳闸、高压加热器切除、除氧器溢流调节阀误开启以及异常工况下除氧器水位低等,保证了机组的安全运行。
The frequency converter of condensate pump is widely used in power plants, and the control strategy is commonly designed as ＂the deaerator level controlled by the valve, and the con- densate water pressure controlled by the frequency converter＂ or ＂level controlled by converter, and pressure controlled by valve＂. However, both of the control strategies have flaws. Thus, the ＂level controlled by value, with pressure controlled by converter＂ control logic was optimized, and then applied in Huaneng Shidongkou Second Power Plant units. The results show that, the opti- mized control logic effectively imoroves the safety and economics of the frequency converter.
出处
《热力发电》
CAS
北大核心
2014年第1期15-20,共6页
Thermal Power Generation
