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1、翻譯部分外文文獻外文文獻BiogasPowerPlantsWasteHeatUtilizationResearchesAbstractThispaperdiscussedthesignificanceofdevelopingbiogaspowerplantsinlargebreedingfarmsfirstly.Thenthesystemenergybalancetheproducedprocessofwasteheatwerestud

2、iedrespectively.ThestatusofmakinguseofwasteheatinbiogaspowerplantswerealsodiscussedinChina.Throughstudiestwomainschemesofmakinguseofwasteheatinbiogaspowerplantsoflargebreedingfarmswasproposedwhichwereprovidingresidentswi

3、thheatingcoolingloadftherequirementsofindoenvironmentaccdingtoseasonsconstructingcoldstagesfpoultryproductprocessingstage.Inthispaperthemethodsofmakinguseofwasteheatinabiogaspowerplantofanagriculturaldemonstrationzoneina

4、coastalcitywerediscussedfrombothsidesofeconomicenvironmentalbenefitsweadoptedthesecondmethodatlast.Theresultsshowedthatthecomprehensiveutilizationrateofbiogasenergywasnearly80%aftermakingfulluseofwasteheat.Theprojecthadg

5、oodeconomicenvironmentalbenefits.Theschemescangivesomereferencesintheutilizationofwasteheatinbiogaspowerplantsoflargebreedingfarmsothersimilarprojects.Keywdsbiogaspowerplantanaerobicdigestionbiogasinternalcombustionengin

6、ewasteheatcoldstageI.INTRODUCTIONWiththecontinuouslyincreasingoflivestockbreedinginvariouspartsofChinahowtodisposefecessewageproducedbylivestocksbecameveryurgent.Livestockfecessewageinfactbelongedtobiomassenergywithinthe

7、scopeofrenewableenergy.Thebestwayofmakinguseofbiomassenergywastodevelopbiogaspowerplants[1].Theprinciplewasthattheganicgarbageoflivestockbreedingcropstrawweretreatedbyanaerobicdigestionthenproducedbiogas.Biogaswasconvert

8、edintogreenelectricitythermalenergy.Theresiduesofanaerobicdigestioncouldbeusedasefficientgreenganicfertilizerinimprovingtheecologicalenvironmentofsoil.Fthisreasonbiogaspowergenerationhadbeenpaidedwideattentionactivelypop

9、ularizedalloverthewld.Until2002thenumberoflargebreedingfarmswasupto8241thetotalamountoflivestockfecesaddedupto1.8billiontonseveryyearinChina.Manybreedingfarmscoulddirectlychangelivestockfecesintobiagasthroughanaerobicdig

10、estionEurope.Thetemperatureenvironmentinanaerobicdigestertankswasmaintenancedbythewasteheatrecoveredfrombiogasinternalcombustionenginesundermostcases.AfterthecombustionofbiogasinengineselectricitywastransmitedtotheStateG

11、ridtolocalusersaftertransfmers.Partofwasteheatwassentintotheanaerobicdigestertanksindertomaintaintheoptimumfermentationtemperature.ThemethodofinstallingwasteheatpipesinconcretewallswasusedinGermany[4].Theenergybalanceina

12、naerobicdigestertanksisshownin(2):QQ=QQQ(2)WhereJQ——heatinputwithrawmaterialsWQ——wasteheatfheatingtheanaerobicdigestertanksLQ——heatoutputwithliquidS1Q——energyconversionlosseswhenheatingS2Q——fermentationdevicesheatloss.3.

13、WasteheatofcomprehensiveutilizationTherecoverableheateliminatedtheheatrequiredftheheatingofanaerobicdigestertankswastheenergythatcanbecomprehensiveutilizated.Thiscanbeshownin(3):Q=Q?Q(3)where?Q——wasteheatofcomprehensiveu

14、tilizationB.WasteHeatGenerationThemainfmofbiogaspowerplantsinChinawasbiogasinternalcombustionenginesmainlydualfuelunits[5].Biogaswascombustedintheunitselectricitywasproduced.Thenelectricitywastransmittedoutaftertransfmer

15、s.Thewasteheatincoolingwaterwasmainlysenttoanaerobicdigestertankstosatisfytheactualheatneedsofanaerobicdigestion.Thetemperatureofflusgaswasabout550[6]thewasteheatintheflusgaswasrecoveredthroughheatexchangerswhichwereinst

16、alledintheexptsofthefluegasducts.TheprincipleofwasteheatgeneratinginbiogaspowerplantswasshowninFig.2.C.CommonMethodsofWasteHeatUtilizationTheutilizationofwasteheatwasnotjustdeterminedbythequantityofthewasteheatitwasalsod

17、eterminedbythequalityofwasteheateconomy.Thehigherofthewasteheattemperaturethebetterofitsquality.Manytypesofheatrecoveryunitswereusedatpresent.Therewereaboutfourmainlymethodsofwasteheatutilization[7]:1.Wasteheatwaschanged

18、intolowtemperatureheatthroughheatexchangersthenwasusedfheatinghotwaterdryingsoon.2.Wasteheatwasusedtogeneratepowerthroughgasturbines.Thismethodmainlyappliedtohightemperaturewasteheatrecoverylikethewasteheatfromenginevent

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