简介:Improvingtheunitheatefficiency,reducingcoalconsumptionandtheemissionofCO2andmeetingtherequirementsofenvironmentalprotectionandenergyconservationisthegoaloftheboilerandthepowerindustry.Developmentsoflargecapacityandhighparameterultra-supercritical(USC)unitsarethetendencyofthepowerindustry.ThereisnodoubtthatthedevelopmentofUSCunitsisbasedonthedevelopmentofmaterials,especiallythematerialsusedforsuper-heaterandreheaterinhigh-temperatureUSCboiler.Duetothelongtimeexposuretotheharshenvironment,suchasbearingthe600℃steamoxidation,andwithstandingthecorrosivefluegasandflyasherosion,thematerialsrequirenotonlygoodhigh-temperaturestrength,butalsoagoodcorrosionresistance.Inconsiderationoftherequirementscitedabove,foreigncountrieshaddevelopedTP310HCbN(07Cr25Ni21CbN)austeniticheat-resistantsteel.However,thedomesticdemandsforthismaterialstilldependonimportandthecostishigh,sotheboilerandthepowerindustryexpectseagerlythatthesesteelscanbeproducedbydomesticmetallurgicalindustry,especiallyBaosteel,toreplacetheimportedproducts.Inordertosatisfytherequirementsofdomesticmanufacturingsuper-heaterandreheaterusedinultra-supercriticalpowerboiler,afterdevelopedT23、T91、T92、S30432highpressureboilertube,BaosteelbegantodevelopTP310HCbN(07Cr25Ni21CbN)austeniticstainlesssteeltubeinJanuaryof2007.Thisstudydescribesthecompositiondesign,themanufacturingprocessofproduct,andtheassessmentofperformanceofBaosteel’sTP310HCbN(07Cr25Ni21CbN).ThedataindicatesthatpropertiesofBaosteel’sTP310HCbN(07Cr25Ni21CbN)conformtotheASMESA-213standardandGB5310standard,soitcansubstitutetheimportedproductsandissuitableformanufacturingpowerstationboilerofgreatcapacityandhighsteamparameters.
简介:以Nb2O5、In(NO3)3和Sm(NO3)3为原料,采用溶胶-凝胶法制备新型光催化材料Sm2InNbO7。采用X射线衍射(XRD)、扫描电镜(SEM)、比表面积分析(BET)以及紫外-可见漫反射光谱(UV-Visdiffusereflectancespectroscopy)技术对该材料的结构、形貌和光吸收性能进行表征。以可见光下亚甲基蓝(MB)的脱色降解为模型反应,考察煅烧温度、催化剂用量、H2O2用量和pH值对Sm2InNbO7光催化性能的影响。结果表明,煅烧温度为700℃时即可获得具有烧绿石结构的Sm2InNbO7。随焙烧温度升高,催化剂结晶度增加,粒径增大,比表面积下降,吸收边界出现一定的蓝移;在850℃下煅烧3h获得的Sm2InNbO7样品具有最高的催化活性,当50mL质量浓度的10mg/L的MB溶液中催化剂用量为0.1g、30%H2O2溶液用量为0.5mL、pH=6时,亚甲基蓝的降解率高达93.8%,明显优于固相法制备的Sm2InNbO7以及P-25TiO2。较高的pH值有利于光催化反应的进行。