DG230-64型锅炉给水泵抗汽蚀技术研究
发布时间：2018-11-28 09:39
【摘要】：DG230-64型锅炉给水泵是多级离心式叶片式泵,用于火力发电厂的给水管道系统,但在某电厂运行时发现泵的实际运行参数与设计参数存在较大偏差,泵的设计流量为230m3/h,但在实际运行流量超过160m3/h继续增大时,出口压力表就开始出现较大幅度的频繁摆动,同时泵内出现啪啪啪的声音,经过故障诊断确认是给水泵内出现了汽蚀现象。 据统计,水泵的汽蚀现象在发电厂时有发生,给机组的安全稳定运行带来很大困扰。汽蚀产生的原因很多,自人类首次发现汽蚀现象的一百多年来,人们针对汽蚀产生的机理进行了大量的研究,但由于泵内液体流动状态的复杂性,始终无法准确预测和控制泵的汽蚀,如何预防汽蚀、提高泵的抗汽蚀性能仍是一个重要的研究课题。论文以给水泵汽蚀现象为主要研究对象,结合DG230-64型锅炉给水泵在电厂的运行情况,深入探讨给水泵产生汽蚀的原因、泵汽蚀余量的确定方法、预防给水泵发生汽蚀的有效措施,以及给水泵发生汽蚀后的解决方案,从设计和使用两方面入手解决给水泵的汽蚀问题。从而尽可能的避免因给水泵汽蚀而产生的损坏,提高机组的运行安全性和发电厂的经济性。 研究的结果表明,给水泵如果发生了汽蚀,可以通过对给水泵的结构和入口的管道系统进行改造,提高泵的抗汽蚀性能,从而消除汽蚀现象。
[Abstract]:The DG230-64 boiler feedwater pump is a multistage centrifugal vane pump, which is used in the feedwater pipeline system of a thermal power plant. However, it is found that there is a big deviation between the actual operating parameters and the design parameters of the pump in a power plant, and the design flow rate of the pump is 230 m3 / h. However, when the actual flow rate exceeds 160m3/h, the outlet pressure gauge starts to swing frequently, and the sound of crack appears in the pump. The fault diagnosis confirms that cavitation occurs in the feed pump. According to statistics, the cavitation of water pump occurs from time to time in power plant, which brings great troubles to the safe and stable operation of the unit. There are many reasons for cavitation. Since the first discovery of cavitation phenomenon more than 100 years ago, people have done a lot of research on the mechanism of cavitation, but because of the complexity of liquid flow in pump, It is always impossible to accurately predict and control the cavitation erosion of the pump. How to prevent cavitation erosion and improve the anti-cavitation performance of the pump is still an important research topic. Taking the cavitation phenomenon of feed water pump as the main research object, combined with the operation of feed water pump of DG230-64 boiler in power plant, the cause of cavitation of feed water pump and the method of determining cavitation margin of pump are discussed in depth. The effective measures to prevent cavitation of feed water pump and the solution after cavitation of feed pump are discussed. The cavitation problem of feed pump is solved from two aspects: design and use. Therefore, the damage caused by cavitation of feed pump is avoided as far as possible, and the operation safety of unit and the economy of power plant are improved. The results show that if cavitation occurs in the feedwater pump, the cavitation phenomenon can be eliminated by improving the cavitation resistance of the pump by modifying the structure of the feed pump and the inlet pipeline system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311
本文编号：2362484
[Abstract]:The DG230-64 boiler feedwater pump is a multistage centrifugal vane pump, which is used in the feedwater pipeline system of a thermal power plant. However, it is found that there is a big deviation between the actual operating parameters and the design parameters of the pump in a power plant, and the design flow rate of the pump is 230 m3 / h. However, when the actual flow rate exceeds 160m3/h, the outlet pressure gauge starts to swing frequently, and the sound of crack appears in the pump. The fault diagnosis confirms that cavitation occurs in the feed pump. According to statistics, the cavitation of water pump occurs from time to time in power plant, which brings great troubles to the safe and stable operation of the unit. There are many reasons for cavitation. Since the first discovery of cavitation phenomenon more than 100 years ago, people have done a lot of research on the mechanism of cavitation, but because of the complexity of liquid flow in pump, It is always impossible to accurately predict and control the cavitation erosion of the pump. How to prevent cavitation erosion and improve the anti-cavitation performance of the pump is still an important research topic. Taking the cavitation phenomenon of feed water pump as the main research object, combined with the operation of feed water pump of DG230-64 boiler in power plant, the cause of cavitation of feed water pump and the method of determining cavitation margin of pump are discussed in depth. The effective measures to prevent cavitation of feed water pump and the solution after cavitation of feed pump are discussed. The cavitation problem of feed pump is solved from two aspects: design and use. Therefore, the damage caused by cavitation of feed pump is avoided as far as possible, and the operation safety of unit and the economy of power plant are improved. The results show that if cavitation occurs in the feedwater pump, the cavitation phenomenon can be eliminated by improving the cavitation resistance of the pump by modifying the structure of the feed pump and the inlet pipeline system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311
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