简介:摘要随着注CO2气体时间的延长和注入量的增加,剖面均衡性变差,注入的CO2气体前沿缘会沿高渗透条带突进,导致油井采出流体中CO2含量远超出最初的开发预测数据,导致部分油井井口出油温度过低,甚至造成井筒冻堵。建立CO2原油混合体系在井筒流动中的温度、压力耦合模型,编制“井筒流动温度和压力耦合计算软件”,分析了CO2摩尔分数、日产油量及井深对井口采出液温度的影响。结果表明,随着CO2摩尔分数增加,井口采出液温度降低;相同CO2摩尔分数下,随着井深、日产油量的增加,井口采出液温度均表现为逐渐增加的趋势。此外,该软件界面友好,方便现场人员操作,具有一定的工程实际价值。
简介:OnthebasisofMARKAL-MACROmodelof'Energy-Economy-Environment'systemandKeyfitzmodelofdemography,energydemandinChinainthefuturewascalculated.Threescenarioswereputforwardtakingintoaccountofenergyefficiency,energystructureandrestrictionofclimatechange.CO2EmissionsinChinawillreachpeakvalue11.85Gtin2042inreferencescenario;10.75Gtin2036inoptimizedscenario;and9.47Gtin2031inrestrictionscenarioofclimatechange.Comparewithreferencescenario,carbonemissionsinrestrictionscenarioofclimatechangewilldeclineby2.38Gt,andpeaktimewillbellyearsearlier.Withthedevelopmentofurbanizationandindustrialization,carbonemissionsfromelectricpower,cement,steelwillrisegraduallythengodown;butemissionsfromtrafficwillgoupcontinuouslybecauseoftheincreaseofvehiclefleet.
简介:Inthisstudy,apoly(etherblockamide)(Pebax1657)compositemembraneappliedforCO2capturewaspreparedbycoatingPebax1657solutiononpolyacrylonitrile(PAN)ultrafiltrationmembrane.Ethanol/watermixturewasusedasthesolventofPebaxandtheeffectsofethanol/watermassratiosandPebaxconcentrationonthepermeationpropertiesofcompositemembranewerestudied.Toenhancethecompositemembranepermeance,thegutterlayer,madefromreactiveaminosiliconecrosslinkingwithpolydimethylsiloxane(PDMS),wasdesigned.Theinfluenceofcrosslinkingdegreeofthegutterlayeronmembraneperformancewasinvestigated.Asaresult,aPebax/aminoPDMS/PANmultilayermembranewithhexaneresistancewasdeveloped,showingCO2permeanceof350GPUandCO2/N2selectivityover50.Theblendofpolyethyleneglycoldimethylether(PEG-DME)withPebaxascoatingmaterialwasstudiedtofurtherimprovethemembraneperformance.AfterbeingcombinedwithPEG-DMEadditive,CO2permeanceofthefinalPebax-PEG-DME/amino-PDMS/PANcompositemembranereached400GPUabovewithCO2/N2selectivityover65.
简介:摘要应用二氧化碳激光机治疗848例宫颈糜烂患者,宫颈糜烂是慢性子宫颈炎中最常见的一种。应用二氧化碳治疗宫颈疾病,收效较好。我院应用二氧化碳激光机治疗慢性宫颈炎848例。效果良好,报道如下。
简介:IntheautomaticCO2arcwelding,thealterationoftheverticaldistancebetweentheweldingtorchandtheworkpiecehasastrongeffectontheweldingparameterssuchasweldingcurrentandvoltage,withtheresultthattheappearanceandqualityofweldarenotsteady.Toweakentheinfluenceofthedistancealteration,amethodisputforwardinthepaper.Themethodisthatthealternatewire-feedcontrolisusedforcompensatingtheweldingcurrent.Onthebasisoftheoreticalanalysis,astaticnumericalmodelforalternatewire-feedcontrolisestablished.Theexperimentsshowthatthemodel-basedregulationofthewirefeedratecancompensatetheweldingcurrentandensuretheappearanceofweld.Whenthealterationofverticaldistancebetweenthetorchandtheworkpieceisgreater,notonlyisthewirefeedrateregulated,buttheoutputvoltageofthepowersourceisadjustedtoensuretheappearanceandqualityofweld.