1000MW机组除氧器暂态特性研究

Study on Transient State Characteristics of a Deaerator for 1000 MW Units

为了保证在除氧器滑压运行时发生机组甩负荷的危险情况下给水泵不汽蚀,对低压给水系统、除氧器布置等进行优化设计,深入研究除氧器暂态特性。针对某1 000 MW超超临界机组理论分析除氧器暂态计算模型,并根据计算模型分析除氧器暂态计算工况点选择、除氧器水箱体积、低压给水管径及长度等因素对给水泵汽蚀的影响,为给水泵安全运行、除氧器布置优化创新、构建节约型电厂提供理论参考。

To prevent the feed pump cavitation during load rejection of a unit under sliding operation of its deaerator, an optimized design was conducted on the low-pressure feed water deaerating system and the deaerator arrangement, while the transient state characteristics of the deaerator was studied in detail. Based on theoretical analysis of the transient calculation model for the deaerator of a 1 000 MW ultra supercritical unit, the effects of following factors on the feed pump cavitation were analyzed, such as the selection of the deaerator operating condition for transient calculation, the tank volume of the deaerator, the diameter and length of the low-pressure feed water pipe, etc., which may serve as a reference for safe operation of the feed pump, optimal arrangement of the deaerator and energy saving of the power plant.