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20167477doi10．6041/j．issn．1000-1298．2016．07．028112132211．7121002．1001253．712100PTC8m3216077.31kJ/d23180.01kJ/d。b2.4mf0.6m4.16m20.0168m。Fluent35℃。PTC33.6～35.8℃Fluent。S216.4TK11+2A1000-1298201607-0202-062016-01-072016-02-29201503135-181979—E-mailtzgkyxm@163．com1957—E-mailql2871@126．comDesignandImplementationofParabolicTroughConcentratorHeatingAnaerobicＲeactorYangXuanmin1WangYajun12QiuLing13ZhaoLixin2JiaJixiu2WangXiaoliang11．CollegeofMechanicalandElectronicEngineeringNorthwestA＆FUniversityYanglingShaanxi712100China2．InstituteofEnergyandEnvironmentalProtectionChineseAcademyofAgriculturalEngineeringBeijing100125China3．WestScientificObservingandExperimentalStationofＲuralＲenewableEnergyExploitationandUtilizationMinistryofAgricultureYanglingShaanxi712100ChinaAbstractForananaerobicfermentationsystemthetemperatureisoneofkeyfactorswhichaffecttheefficiencyofbiogasproduction．AparabolictroughconcentratorPTCwasusedastheheatsourceforan8m3undergroundanaerobicdigester．Toimprovetheefficiencyofconcentratingsolarcollectorsandthebiogasproductivityoftraditionalanaerobicfermentationsystemthesizesofimportantcomponentsinthedigesterweredeterminedandtheenergybalancewasalsocalculated．MoreovertheanglechangeofsolarconcentratorinYanglingwascountedtheangleofthecollectorduringoneyearwasoptimizedandtheinclinationangleandinstallationmethodoftheconcentratorbracketwerealsodesigned．Itwasfoundthatfeedheatloss16077.31kJ/dandwallheatloss23180.01kJ/dwerethetwomainheatloadsinthissystem．ThekeyparametersofPTCweredeterminedthesizeofaperturewas2.4mthefocaldistancewas0.6mtheareaofcollectorwas4.16m2andthediameterofcollectorpipewas0.0168m．InadditiontheheattransferofanaerobicreactorwassimulatedthroughFluentsoftware．Thesimulationresultsrevealedthatinteriortemperatureinthedigestercouldbemaintainedat35℃．APTC-basedanaerobicdigesterwithsimilarparametersofsimulationmodelwasdesignedtoverifythesimulationeffect．Theexperimentresultsindicatedthatthetemperaturerangeofmaterialliquidinthereactorcouldbekeptat33.6～35.8℃approximatelyconsistentwiththeFluentsimulation．Theresultsinthisstudyprovideanewsolutionforefficientandlow-costbiogasfermentationdevice．Keywordsanaerobicreactorparabolictroughconcentratorsteadysimulation1、、2－3。、、4－7。、、8。ParabolictroughconcentratorPTC9。2007PTC6400kW·h14。PTC、、10。8m3。。1PTC1.11.1.1PTC、、、、1。8m3PTC11。1.1.2Qj、Qloss、Qq12。Qsolar、QeQr2。QqQrQq=0Qr=0ρmvmCmdTmdt=Qe+Qsolar－Qloss－Qj11PTCFig．1StructurediagramoffermentationdevicebyPTCheating1．2．3．4．5．6．7．8．9．2Fig．2Schematicpresentationofthermalbalanceofanaerobicreactorρm———kg/m3vm———m3Cm———kJ/kg·KTm———℃t———sρmvmCmdTmdt=01Qsolar－Qloss－Qj=021.1.2.1Qj13Qj=CmMtd－ts3M———kg/dtd———℃35℃ts———℃tata=ts=5℃8m312.8kg10%M=12.8kg10%=128kg3027Cm=4.1868kJ/kg·K。Qj=16077.31kJ/d。1.1.2.2Qloss114U=11a1+δλ+1a24a1———336W/m2·Ka2———0.47W/m2·Kδ———0.2mλ———1.543W/m·KU=0.4425W/m2·K。215f1=25Ｒ5f2=27Ｒ6V=0.36πＲ3+πＲ2h7S=2VＲ+1.52πＲ28f1———mf2———mＲ———m8ＲＲ=1.188mS=20.21m2。38m3。3Fig．3Geometricalsizeofanaerobicreactor3QlossQloss=UStd－ta=23180.01kJ/d9Qsolar=39257.32kJ/d。1.2PTC1.2.116。Vmin=Qsolarcρtguan－tliao10Vmin———m3c———kJ/kg·Kρ———kg/m3tguan———℃75℃tliao———35℃Vmin=0.23m3。1.2.217Ac=Qsolarf0Itηcd1－ηc11Ac———m2It———14.145MJ/m2·df0———0.6ηcd———0.5ηc———0.2Ac=4.16m2。1.2.34Fig．4ConcentrationefficiencyofPTC4b。18。n=4K=68.4。b=2.4m。f=b/n=0.6mdmin(=2f+14fb2)2sinD212D———0.53°dmin=0.0168m。40220161.2.4b1=τ－δ113τ———N34°16'b1———δ1———2012—20145。53Fig．5Statisticresultofaveragesolardeclinationinrecentthreeyears136。6Fig．6Changingcurvesofheatcollectorangle1.2.5GB27—88。721261—57—11。2FluentGambit。7Fig．7ModelofPTC2.175℃①1/4。②。③。④19。8。。GambitinterfaceFluent。8Fig．8Geometricalmodelofreactor1．2．3．4．5．6．2.2Tgrid2072984642016726224089441339。9Fig．9Gridofmodel2.30.0168m50270.03m。35℃750℃。150L/h0.06m/s。50℃。22.5W/m2HeatFlux。。1035℃。10PTCFig．10SimulationresultofPTCheatinganaerobicreactor2.420151125。4.2m2、0.25m3、8m3、、11。5d1130120.1℃11.2℃37.2℃78.4℃33.6℃35.8℃。PTC8m334.7±1.1℃Fluent。11PTCFig．11PhotoofPTCheatinganaerobicdigester1．2．3．12、Fig．12Variationsofwatertemperatureenvironmenttemperatureandbiogasdigestertemperature31PTC16077.31kJ/d23180.01kJ/d。2PTCPTCb2.4m、f0.6m、0.0168m。3PTC35℃。1CHＲISTIAENSENLHEITBEＲGＲ．GreeningChina’sruralenergynewinsightsonthepotentialofsmallholderbiogasJ．Environment＆DevelopmentEconomics20141918－29．2CHENYYANGGSWEENEYSetal．HouseholdbiogasuseinruralChinaastudyofopportunitiesandconstraintsJ．ＲenewableandSustainableEnergyＲeviews2010141545－549．3ＲAJENDＲANKASLANZADEHSTAHEＲZADEHMJ．HouseholdbiogasdigestersareviewJ．Energies2012582911－2942．4SANDEＲBLAＲSJVANVetal．Small-scalehouseholdbiogasdigestersanoptionforglobalwarmingmitigationorapotentialclimatebombJ．ＲenewableandSustainableEnergyＲeviews2014332736－741．5FEＲＲEＲIGAＲFIMUGGETTIEetal．Biogasproductioninlow-costhouseholddigestersatthePeruvianAndesJ．BiomassandBioenergy20113551668－1674．60220166．J．2014455160－165．XIAJiqingWANGNingningWANGXiaodongetal．DesignofhotwaterwithheatpipeforbiogassystemJ．TransactionsoftheChineseSocietyforAgriculturalMachinery2014455160－165．inChinese7GAUTAMＲBAＲALSHEＲATS．BiogasasasustainableenergysourceinNepalpresentstatusa