简介：Air-atomizedfogcoolingisparticularlysuitablefortheafter-potcoolingofgalvanizedsteelstrips.Withairandwaterservingasworkingmedia,anexperimentalstudywasconductedontheatomizationcharacteristicsofanewly-developedcross-flowtypeoffognozzles.Thewaterfluxdistribution,sprayangleandpressureofwaterandairweremeasured.Theresultsshowthatthewaterdropletsizewassmallandinsensitivetothewaterflowrate.Thesprayanglewassmallandthewaterflowrateslightlyaffectedtheairpressureinthechamber.Anempiricalcorrelationbetweenthepressureinthechamberandthegasflowratewasobtainedforthepurposeofequipmentdesign.

简介：DuetofastdevelopmentofChinesesteelindustry,continuousadjustmentofproduct,improvementofquality,researchofvalue-addedproduct,RHtechnologyissignificantlydeveloped.MoreandmoresteelplantsarecoveredwithRHfacilities.RHratioisgrowingrapidlyaswell.Overpastdecade,throughassimilatingadvancedforeigntechnologiesandfurtherrefiningthem,ChineselargescalesteelplantsmasterthetechnologyofRHproduction,operation,maintenanceandmakeitmorewidespread.RHfunctionsarewellappliedandimproved.RHismorewidelyeffectivelyputintouse.Throughindependentinnovation,RHcoredevicesandtechnology,suchasRHvacuumpump,oxygentoplance,vacuumvesselpreheatinglance,ladleliftingdeviceetc.haverealizedlocalization.Thedevelopmentofequipmentdesign,softwaredesign,equipmentmanufacturingtechnology,equipmentmounting,testtechnologyandEPCmanagementmakesequipmentconfigurationmoreflexible,equipmentmorefunctionalandstable,easiertooperateandmaintain.Italsoguaranteeshighlyeffectiveandlowenergyconsumptionproductionandqualityofsteel,reachesinternationaladvancedlevel,lowersthecostofRHconstructionandoperation,makesafter-sakeservicemoreconvenient.HowtocontinuouslyoptimizeanddevelopRHprocess,equipmentandcontroltechnology,inordertomeettheneedsofproductwithmorereasonableandeconomicprocess,exploitpotentialities,buildmoreeffective,lowercost,lowerenergyconsumption,protectingenvironmentRHfacilitieswillbethekeypointoffutureRHtechnologydevelopmentinChina.

简介：CeO2andCuOx-CeO2supportedpotassiumcatalystsweresynthesizedbywetnessimpregnationmethod.ThecatalystswerecharacterizedbyBET,NO-TPO,NOx-TPDandsoot-TPOmeasurements.Bythedecorationofpotassiumandcopper,themaximumsootcombustiontemperatureoftheceria-basedcatalystdecreasedto338and379°CinthepresenceandabsenceofNOunderaloosecontactmode,re-spectively.ThepronouncedlyenhancedNOoxidationabilitybycopperintroductionandNOxstoragecapacitybypotassiummodif...

简介：Thecrackingandaromatizationofn-hexaneoverH-ZSM-5modifiedbyvariousrareearthswereinvestigatedbymeansofcontinuousflowmicro-reactor.ThesurfacepropertiesofmodifiedH-ZSM-5catalystswereobtainedfromIR,XRDandXPS.Theresultsshowthattherareearthsenhancethearomatizingpropertiesofthecatalystswhicharepreparedbymechanicalmixturemethod.Theresultsofn-hexanecrackingandaromatizationarecorrelatedwiththeacidity.TheBrnstedacidicsitesaretheactivesitesofn-hexanearomatization,whileLewisacidsiteplaysanimportantroleinn-hexanecracking.

简介：Thehistoryofthedevelopmentofthetube&pipedivisionofBaosteelwasreviewedinthearticle,focusingontheprocessoftechnicalinnovationandtheproductcategoryenrichment.Thankstothetechnicalinnovation,theφ140productlinehasbecomethemostefficientoneintheworld.Withtheadvanceofconglomeracyandtheconstructionofthemostadvancedweldpipelineandtheφ460premiumqualityfinishing(PQF)line,thecatalogueofBaosteeltube&pipeproductshascoveredtheextensiverangefromthehotrolltocoldroll,theseamlesstothewelded,andalloftheproductdimensionscopefrom25.4mmto610mm.Tomeettherequirementsofrelevantindustriessuchasenergy,transportation,machinery,ammunitionandotherrelevantindustries,theproductvarietyisdivertingfromcarbonsteeltoalloysteel,stainlesssteelandspecialalloys.AstheBaosteelSteelTubingPlantincreaseditsnumberofproductionunits,expandeditsproductioncapacityanddevelopednewproducts,ithasgrownintoapipeandtubesupplierwithglobalcompetitiveness.

简介：Withcoalgasasareducingagent,thecatalyticreductionofSO2tosulfurinthefluegasproducedinmetallurgicalprocesseswasstudiedovercatalystsofrareearth-Fe/Al2O3(REFe/Al2O3).ThecatalyticactivityoftheREFe/Al2O3catalystonthereductionofSO2tosul-furwasinvestigatedbasedonkindsandthecontentsofrareearthsanddifferentpreparationmethodofthecatalyst.Additionally,themecha-nismofthiscatalyticreductionreactionwasalsoexplored.ResultsshowedthatdifferentrareearthimposeddifferenteffectontheactivityoftheFe/Al2O3catalyst.Especially,theadditionofSmandDygreatlyimprovedthecatalyticactivityofFe/Al2O3.TheyieldofsulfuroverSmFe/Al2O3wasincreasedto86.62%at360℃,whichwas40.5%higherthanthatoverFe/Al2O3atthesametemperature;andthesulfuryieldoverDyFe/Al2O3wasincreasedto91.62%at400℃,26.4%higherthanthatoverFe/Al2O3.ThecatalyticactivityofREFe/Al2O3wassomehowdependentonthecontentofrareearth.ForSmFe/Al2O3,thecontentofSmwasoptimizedtobeabout1.0wt.%.Therareearthcatalystpreparedwithdifferentmethodsalsoshowedvariedactivity.Thesulfuryieldoverrare-earthtransitionmetalcatalystsfollowstheorder:SmandironsolutionmixingimpregnationSmfirst,thenironsolutionimpregnationironfirst,thenSmsolutionimpregnation.ThereactionmechanismofSO2reductiontosulfurwithcoalgaswasproposedtobeanintermediatemechanism.

简介：Aseriesofcoal-basedactivecarbon(AC)catalystsloadedbyFe-Cu,Fe-Cu-CeandFe-Cu-Lawerepreparedbythesol-gelmethodforcarbondisulfide(CS2)hydrolysisandtheirperformancesforCS2hydrolysisinafixed-bedreactorwereinvestigatedinthiswork.TheresultsshowedthatthekindofrareearthoxideanditscontenthadobviouseffectonhydrolysisremovalofCS2.Theeffectsoftemperature,spacevelocity,CS2concentrationandO2concentrationwerealsodiscussedrespectively.Furthermore,thesuitableoperatingconditionswereobtained.Itwasfoundthatthepoisoningofhydrolysisactivesitescouldresultintheformationofsulfuricacidonthecatalystsurface.

简介：电炉厂采用100tUHP电炉短流程生产超（超）临界高压锅炉管用钢R102。通过实施精料方针、规范脱氧工艺、优化吹氩处理工艺、选择最佳二冷区配水模型、钢水低过热度浇注、控制拉速等集成的工艺，确保开发出的产品能够满足市场需求。

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简介：天津开发区的一项最新科技成果——“6000目超细重钙在PVC管件生产中的应用”，日前通过了天津市科委鉴定。该技术成功推出了由这种超细粉体与PVC树脂按1：2比例配制的新型复合材料，以此替代纯粹的PVC树脂生产塑料管件，对于节省石油资源、降低材料成本具有重要意义。

简介：TwonovelwashcoatsCe0.8Zr0.15La0.05OδandCe0.8Zr0.2O2waspreparedbyanimpregnationmethod,whichactedasahostfortheactivePdcomponenttopreparePd/Ce0.8Zr0.15La0.05Oδ/substrateandPd/Ce0.8Zr0.2O2/substratemonolithiccatalystsfortoluenecombustion.ThewashcoatswascharacterizedbyX-raydiffraction(XRD),Ramanspectroscopy,Brunauner-Emmett-Teller(BET),andH2-temperature-programmedreduction(H2-TPR).Theresultindicatedthatboththewashcoatshadstrongvibration-shockresistanceaccordingtoultrasonictest.DopingLa3+intoCeO2-ZrO2solidsolutioncouldgeneratemoreoxygenvacancies,andcouldinhibitthesinterofCeO2-ZrO2solidsolutionwhencalcinedathightemperatures(800,900and1000°C).ThewashcoatCe0.8Zr0.15La0.05Oδhadmuchbetterredoxproperties.ThereductivetemperatureofCe4+speciesshiftedtolowtemperatureby60°Cwhenthewashcoatscalcinedathightemperatures(800,900and1000°C).ThePd/Ce0.8Zr0.15La0.05Oδ/substratemonolithiccatalystcalcinationat500°Chadthebestcatalyticactivityandthe95%tolueneconversionatatemperatureaslowas190°C.Whencalcinedatlowtemperature(500and700°C),thecatalyticactivityhaslittleimprovement,however,whencalcinedathightemperature,thecatalyticactivityofPd/Ce0.8Zr0.15La0.05Oδ/substratemonolithiccatalystshadsignificantimprovement.Ascatalystwashcoat,theCe0.8Zr0.15La0.05OδhadbetterthermalstabilitythanthewashcoatCe0.8Zr0.2O2,thedevelopedPd/Ce0.8Zr0.15La0.05Oδ/substratemonolithiccatalystinthisworkwaspromisingforeliminatingVolatileorganiccompounds.

简介：在钢材市场持续疲软的情况下，为了适应烧结生产的低成本运行，对1号烧结机进行了适应厚料层烧结的设备改造，取得了很好的效果。

简介：通过对轴承套圈进行组织、夹杂物分析后发现,超精磨后套圈沟槽内的凹坑处碳化物颗粒较少造成局部的软点;凸起处碳化物颗粒较大且聚集产生局部的硬质点。金相分析表明,这种微观区域的硬度不均匀是造成超精磨工序中精度无法保证的原因。

简介：联合国环境规划署6月3日发布（2009年全球可持续能源投资趋势报告》。报告显示，2008年全球能源领域共吸引投资2500亿美元，其中可再生资源吸引投资1400亿美元，占投资总额的56％，而对传统化石燃料的投资为1100亿美元，仅占44％。可再生能源的投资额首次超过化石能源。

简介：以2015年1月部分时段的铁路到达、排出时刻为例,分析南钢铁路物流目前存在的问题,从多个方面寻找铁路超停时费用发生的原因。提出几个管理创新的观点,以利于超停时费用的降低。

简介：以纳米Cr2O3和乙炔黑为原料，经高温还原碳化制备超细Cr3C2粉末，研究反应温度、反应时间以及配碳量对Cr3C2粉末的粒度与游离碳含量的影响。通过热力学计算，只有当温度高于1350K时还原碳化反应才有可能进行，采用纳米Cr2O3可显著降低反应温度，在1573K下焙烧6h碳化率即达到98.20%；Cr3C2粉末的游离碳含量随配碳量增加而显著提高，配碳量（质量分数）为理论配碳量的1.05倍时制得游离碳含量为0.23%、氧含量为0.91%（均为质量分数）、平均粒度为1μm的Cr3C2粉末，该粉末达到硬质合金及热喷涂应用的要求。

简介：本文介绍了国家“八五”课题“超细WC粉及超细硬质合金的研究”的研究工作,解决了制取超细合金的两大关键:优质超细WC粉的制取;有效地阻止或限制WC晶粒在烧结过程中的长大。全面达到了课题的预期目标。本成果的整体技术水平居国内领先,达到或超过了国外同类合金的先进水平。在ZK10UF、ZUM103超细合金的应用实例中,显示了超细合金的优异性能。

简介：混合氧化物(Ce0.6Zr0.4O2)由帮助微波的加热一起沉淀准备了的CeO2-ZrO2被用作支持经由早期湿的受精的方法与各种各样的CuO内容(0wt.%15wt.%)准备一系列CuO/Ce0.6Zr0.4O2催化剂。获得的CuO/Ce0.6Zr0.4O2样品被N2吸附，XRD，拉曼，TEM和H2-TPR技术，和他们的催化活动描绘因为公司氧化被调查。结果证明CuO/Ce0.6Zr0.4O2催化剂的活动被CuO的内容强烈影响，并且有10wt.%CuO的催化剂在公司氧化展出了最好的催化活动，它能在催化剂被归因于CuO，和高氧空缺集中的高分散和reducibility。

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