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《长距离多泵联合运行输水系统停泵水锤防护措施.pdf》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第12卷第6期南水北调与水利科技Vo1.12No.62014年12月South-to-NorthWaterTransfersandWaterScience&TechnologyDec.2014DOI:10.13476/j.cnki.nsbdqk.2014.06.025长距离多泵联合运行输水系统停泵水锤防护措施冀健红,高传昌。,刘新阳(1.河南省电力勘测设计院,郑州450007;2.华北水利水电大学,郑州450011)摘要:运用水锤理论和特征线法,结合工程实例,对采用缓闭式蝶阀、空气阀和单向调压塔等防护措施的长距离多泵联合运行输水系统停泵水锤进行
2、计算和分析,得到了管道沿程的水头包络线以及泵端性能参数相对值的变化曲线。计算结果表明,无防护措施下最小水锤水头较低,泵端性能参数变化较大;泵端蝶阀防护可以有效地控制泵端性能参数流量和转速变化幅度,但水头的变化出现了振荡,最小水锤水头值降低;采用空气阀+泵端蝶阀防护可以有效地增加最小水锤水头值,只在管道局部出现负压,但与泵端蝶阀防护相比性能参数变化有所增大;单向调压塔+泵端蝶阀对停泵水锤防护效果最为明显。为了减小单向调压塔数目,最终选择单向调压塔+空气阀+泵端蝶阀的组合作为最终的防护措施,与无防护措施相比,组合防护下整个管道不出现负压,泵端水头虽
3、出现了振荡,但幅度不大,流量最大变化幅度下降0.15,转速最大变化幅度下降0.7,转矩振荡时间变短。关键词:长距离;多泵;输水系统;停泵;水锤;防护措施中图分类号:TV68文献标志码:A文章编号:1672—1683(2014)06—0112—04Protectivemeasuresforpump-stoppingwaterhammerofwatertransfersystemwithlongdistanceandcooperationofmultiplepumpsJIJian-hong,GAOChuan-changg,LIUXin-yang2(
4、1.HenanElectricPowerSurveyandDesignInstitute,Zhengzhou450007,China;2.NorthChinaInstituteofWaterResourcesandHydropower,Zhengzhou450011,China)Abstract:Thewaterhammertheoryandcharacteristiccurvesmethodcombinedwithengineeringexamplewereusedtoanalyzethepump-stoppingwaterhammerofw
5、atertransfersystemwithlongdistanceandcooperationwithmultiplepumpswhicha—doptssuchpreventivemeasuresasliquid-ofbutterflyvalve,airvalve,andone-waysurgetank.Thewaterhammerheadlinea—longthepipelineandcurvefortherelativevaluesofperformanceparametersofthepumpwereobtained.Theresult
6、sshowedthattheminimumwaterhammerheadis1owerandvariationofperformanceparametersofpumpislargerwithoutpreventivemeasures;theprotectionwiththebutterflyvalvecaneffectivelycontrolthevariationofperformanceparametersofpumpflowrateandspeed,butthevariationofwaterhammerheadshowsoscilla
7、tionandtheminimumwaterhammerheadislowerthanthatwithoutpreventivemeasures;theprotectionwithairvalveandbutterflyvalvecaneffectivelyincreasetheminimumwaterhammerhead,thenegativepressureappearsbutonlyinthelocalarea,andthevariationofperformanceparametersofpumpislargercomparedwith
8、thatofthebutterflyvalveprotection;andtheprotectioneffectwithone-waysurgetan
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