简介:Chinaisanimportantcountryinironandsteelindustry.Powerelectronicsconvertersarewidelyused.Forthecoldrollingmillsofhighspeed,AC-DC-ACconvertersshouldbeused.Inthepaper,thedesignandthecontrolsystemofthelargepowerthree-levelAC-DC-ACconverterwithIGCTsisinvestigated,andaback-to-backlargepowerthree-levelAC-DC-ACconverterwithIGCTshasbeengot.Withaseriesexperiments,theperformanceoftheconverterisexamined.Theexperimentresultindicatestheconverterreachesthedesignrequirementanditshowsexcellentperformance.Theconvertersystemhasbeenputintousesafely.ItisestimatedthattheAC-DC-ACconvertersystemwillbeusedinthedrivesystemsforrollingmillsinthenearfuture.
简介:以EM223-16/16-DC.RLY模块元件级的维修实例,阐述了此模块的工作机制,并且通过抄板,将完整的电路图绘制下来,以便各位同行相互学习和交流。
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:AluminumfilmscoatedonDIsteelsheetswerepreparedbydirectcurrent(DC)magnetronsputtering.Theinfluenceofthedepositionconditionsandfilmthicknessontheformabilityofcoatedsteelsheetswasstudied.TheresultsofthecuppingtestanddrawingtestshowthatthesubstratetemperatureandthicknessofAlfilmsarethekeyfactorsthataffectAladhesionandformabilityofcoatedsteelsheets.AdhesionbecameworsewhenthethicknessofAlsheetswasmorethan2μm.Andformabilitywasimprovedremarkablywhenthesubstratetemperaturewasincreasedto200℃.
简介:Phosphine(PH3)isahighlytoxicairpollutant,commonlyproducedinphosphorouschemicalindustry.Butithasreceivedlessresearchattentionduetoitshandlingdifficultly.COisthemaincontentofthephosphorouschemicalindustrytailgas,theconcentrationofwhichisalwaysmorethan80vol.%,anditcanbethefeedgastoproducevariousvaluableproductssuchasformate,oxalate,andmethanolandsoon.But,PH3isoneoftheimportantbarriers,whichisharmfultothefollowingchemicalprocess.Inordertomakeuseofthetailgas,PH3shouldberemovedfirstly,andCOshouldbecoveredinthewholepurifiedprocedureatthesametime.Inthiswork,themodifiedactivatedcarbon(MAC)wasusedastheadsorbenttoseparatePH3fromthemixturetailgas.SeriesofMACadsorbentswerepreparedfortheadsorptionofPH3,whichloadedCu-FeandCe(La),orseparately.ThePH3adsorptioncapacities,chemicalandphysicalpropertiesofMACwereallinvestigated.Theresultsshowedthatover99%PH3adsorptionefficiencywasachievedwhenusedMACadsorbents.TheremovalefficiencyandPH3adsorptioncapacityoftheCu-Fe-Ce/AC(20:1:0.4)werebothmuchhigherthanthosemodifiedactivatedcarbons.ThemaximumPH3adsorptioncapacitywas71mgofPH3/gofMAContheCu-Fe-Ce/AC,whichweremuchhigherthanliteraturedatausingCuOonlyforadsorbinghydridegases.
简介:酒钢集团宏兴股份公司碳钢薄板厂转炉公用系统中运用ControlNet光纤中继器来扩展远程I/O,进行设备控制。通过该中继系统引起的一起设备故障发现模块手册上关于故障描述及处理建议的相关信息较少,未能起到较强的指导意义,因此搭建实验平台进行测试,以便找寻更多用于故障恢复的相关信息。