Page 211 - 《水资源与水工程学报》2023年第5期
P. 211
! 34 " ! 5 # & ' ( ) & * + , - Vol.34No.5
2023 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2023
DOI:10.11705/j.issn.1672-643X.2023.05.24
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EFGHI:TV93 JK7LM:A JNOI:1672643X(2023)05020708
Filtrationefficiencyofprepumppressurelessscreen
filtersinmicroirrigationsystem
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ZONGQuanli,LIUZhenji,JINGHeyi,ZHANGMingming
(1.CollegeofResourcesandEnvironment,QingdaoAgriculturalUniversity,Qingdao266109,China;2.Collegeof
WaterConservancyandArchitecturalEngineering ,ShiheziUniversity,Shihezi832000,China;3.XinjiangHuili
IrrigationTechnologyCo. ,Ltd.,Shihezi832011,China;4.AgriculturalComprehensiveServiceCenterof
DongchengStreet ,LinquCounty,ShandongProvince,Weifang262600,China)
Abstract:Thepressurelessscreenfilterinstalledinfrontofthepumpcaneffectivelysolvetheproblemsof
highenergyconsumptionandlargepressurelossoftheconventionalfilterwhichisinstalledbehindthe
pump.Inordertoevaluatethefiltrationeffectmoreaccuratelyandcomprehensively ,thecommonlyused
prepumppressurelessscreenfilterinXinjiangwastakenastheresearchobject ,andlaboratoryandinsitu
experimentswerecarriedoutsimutaneously.Intheexperiments,theconceptandcalculationmethodofthe
effectivefiltrationefficiencywereproposed.Theexperimentresultsshowthatthelargerthesandcontentbe
forefiltration ,thegreatertheaveragefiltrationefficiencyofthetotalsand.However,thetotalsandfiltration
efficiencyatacertainmomentdoesnotnecessarilyincreasewiththeincreaseofthesandcontentbeforefil
tration,reflectingthatthefiltrationefficiencyisnotonlyrelatedtothesandcontent,butalsorelatedtothe
meshdiameter ,particlesizeandparticlegroupsizedistribution.Beforeandafterfiltration,thechangeof
particlegroupforfinesandisnotobvious,whereasthatofthecoarsesandchangessignificantly.Therefore,
thescreenofthefilterisonlyeffectiveforthefiltrationofsandparticleswithaparticlesizelargerthanthe
meshdiameter(0.180mminthisstudy).Accordingtotheproposedconceptofeffectivefiltrationefficien
cy,theaverageeffectivefiltrationefficiencyofcoarseandfinesandwascalculatedtobe95.5% and
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