压力空气罐对火电厂补给水系统瞬态负压的防护研究  

Protection Study Avoiding Transient Negative Pressure by Air Vessel of Thermal Power Station Pumping System

作　　者：王文蓉[1] 叶亚玲[2] 鞠小明[1] 

机构地区：[1]四川大学水电学院,四川成都610065 [2]扬州大学水建学院,江苏扬州225009

出　　处：《四川大学学报（工程科学版）》2003年第1期27-30,共4页Journal of Sichuan University (Engineering Science Edition)

摘　　要：采用数学模拟方法进行了压力空气罐对火电厂补给水系统瞬态负压的防护计算研究,分析了空气罐内气体状态、初始气体容积、初始气体压力等参数对管路瞬态压力变化的影响。指出气体状态、初始容积、初始压力不仅影响瞬态压力大小而且影响瞬态压力波动周期,具有压力空气罐的输水系统水泵失电后其管线瞬态压力变化过程具有马鞍型形状,采用压力空气罐可以有效保护火电厂补给水系统免遭瞬态压力破坏,其防护效果与空气罐安装位置及运行参数有关,空气罐愈靠近水泵出口,消除管路瞬态负压的作用愈显著。Established hydraulic transient mathematical model of a pumping system with air vessel for water protection of a thermal station.Calculated the pipeline transient pressure following a pump failure Analyzed the affect of varying vessel capacity and initial pressure in air vessel on the pressure surge recorded at the pumpvesselpipeline junction. Pointed out that state of aircompression and the initial volume and the initial pressure in air vessel have influence on the magnitude and oscillation period of the pressure. The variation of static pressure head on pipeline against time is of the saddle shape. An air vessel can efficiently protect the pipeline avoiding damage caused by transient negative pressure if the pump fails in a thermal power station pumping main. The installation position and the parameter of the air vessel determine the effect of protection. It would be better if air vessel is mounted at the pump discharge.

关 键 词：火电厂 补给水系统 压力空气罐 瞬态负压 水泵 防护 

分 类 号：TM621[电气工程—电力系统及自动化] TV136.2[水利工程—水力学及河流动力学]