长距离输水管线停泵水锤分析及防护
|
摘要
对于采用压力流的长距离输水管线,水锤防护措施对于保障管网稳定运行至关重要。以海南省某典型"长距离、大流量、低扬程"输水工程为例,借助水锤模拟软件,研究了因断电导致停泵时不同水锤防护措施对输水管网的影响。该项目输水管线有明显的高点,存在多处"驼峰""鱼背""膝部",停泵后容易形成负压并发生断流空腔弥合水锤。通过软件模拟,调整工程设计,优化排气阀门类型及布置点位,能避免发生弥合水锤。对于该类型输水管线,泵出口设置两阶段关闭液控缓闭蝶阀意义不大,关键点位设置注气微排阀则能有效控制管网压力,进而保护管道。
For long distance water conveyance pipeline with pressure flow,the water hammer protection measures are critical to ensure the stable operation of the pipe network. Take a typical "long distance,large discharge and low lift"water conveyance project in Hainan Province as an example,with the help of water hammer simulation software,the influence of different water hammer protection measures on the water distribution network caused by power failure was studied. The project had high points along the pipeline. With many"humps","fish backs"and"knees",it was easy to form negative pressure and water hammer of cavities collapsing after pump stopped. Software simulation showed that,adjusting engineering design and optimizing valve type and layout point could reduce the possibility of water hammer. For this type of water conveyance pipeline,it was meaningless to close liquid control slow closing butterfly valves in two stages at pump outlet. Setting gas injection micro-drain valves at key points could effectively control the pipe network pressure,and then protect pipeline.
For long distance water conveyance pipeline with pressure flow,the water hammer protection measures are critical to ensure the stable operation of the pipe network. Take a typical "long distance,large discharge and low lift"water conveyance project in Hainan Province as an example,with the help of water hammer simulation software,the influence of different water hammer protection measures on the water distribution network caused by power failure was studied. The project had high points along the pipeline. With many"humps","fish backs"and"knees",it was easy to form negative pressure and water hammer of cavities collapsing after pump stopped. Software simulation showed that,adjusting engineering design and optimizing valve type and layout point could reduce the possibility of water hammer. For this type of water conveyance pipeline,it was meaningless to close liquid control slow closing butterfly valves in two stages at pump outlet. Setting gas injection micro-drain valves at key points could effectively control the pipe network pressure,and then protect pipeline.
引文
[1]林芳强.海南西部地区电网特殊情况下应急运行方案研究[D].北京:华北电力大学,2014.Lin Fangqiang.Research on Emergency Operation Program of Western Hainan Region Power Grid under the Special Circumstances[D].Beijing:North China Electric Power University,2014(in Chinese).
[2]唐斯庆,张弥,李建设,等.海南电网“9·26”大面积停电事故的分析与总结[J].电力系统自动化,2006,30(1):1-7,16.Tang Siqing,Zhang Mi,Li Jianshe,et al.Review of blackout in Hainan on September 26th-Causes and recommendations[J].Automation of Electric Power Systems,2006,30(1):1-7,16(in Chinese).
[3]朱满林.泵供水系统水锤防护及节能研究[D].西安:西安理工大学,2007.Zhu Manlin.Research on Water Hammer Prevention and Energy Saving of Pumping Water Supply System[D].Xi’an:Xi’an University of Technology,2007(in Chinese).
[4]金锥,姜乃昌,汪兴华,等.停泵水锤及其防护[M].2版.北京:中国建筑工业出版社,2004.Jin Zhui,Jiang Naichang,Wang Xinghua,et al.Pumpstop Water Hammer and Its Protection[M].2nd ed.Beijing:China Architecture&Building Press,2004(in Chinese).
[2]唐斯庆,张弥,李建设,等.海南电网“9·26”大面积停电事故的分析与总结[J].电力系统自动化,2006,30(1):1-7,16.Tang Siqing,Zhang Mi,Li Jianshe,et al.Review of blackout in Hainan on September 26th-Causes and recommendations[J].Automation of Electric Power Systems,2006,30(1):1-7,16(in Chinese).
[3]朱满林.泵供水系统水锤防护及节能研究[D].西安:西安理工大学,2007.Zhu Manlin.Research on Water Hammer Prevention and Energy Saving of Pumping Water Supply System[D].Xi’an:Xi’an University of Technology,2007(in Chinese).
[4]金锥,姜乃昌,汪兴华,等.停泵水锤及其防护[M].2版.北京:中国建筑工业出版社,2004.Jin Zhui,Jiang Naichang,Wang Xinghua,et al.Pumpstop Water Hammer and Its Protection[M].2nd ed.Beijing:China Architecture&Building Press,2004(in Chinese).