简介:Theapplicationresultsofsemi-rebondedmagnesite-chromebricksatRHlowevesselofNKKCorporationKeihinWorkshavebeenanalysed,Theresultsindicatethatthemainreasonsthatcausethedamageoftherefactorybrcksinclude:chemicalattackofslagetothesemi-rebondedmagnesite-chromebricks;pene-trationofmoltenstel,slagintothebricks;andthermaspallingduetotemperaturefluctua-tionduringsteelmakingoperation.Theresultsofmultipleeffectionofthesefactorsleadtoalternativeactionoferosion(chemicalattackandpenetration)andspalling(thermalspallingandstructurepeeling)resultinginthedamageofthebrik,Inordertoimprovetheperformanceofthebricks,itisnecessarytopromotetheresistancetoerosionandthermalshockresistanceaswellastokeeptheaccuratedimensionsofthebrick,Themeasuresofimprovementofresistancetoerosionofmagne-site-chromebrickstakenbytheresearchesmainlyinclude:loweringthecontentsofimpu-ritiesinthebricks(mainlyincludingSiO2,CaO,andnextFe2O3andAl2O3);promotingtheextentofdirectbondofthebrick;formingalargeamountofmagnesia-chromecompositespinelwell-distributedinthebricksthroughaddingalargeamountofsynthesizedmateri-als;enhancingtheresistancetoerosionbyaddingalittleamountofhigh-effectiveadditives,Improvementofthermalshockresistanceofthebricksismainlythroughintroducingsomeadditivetomakeacertainamountofmi-cro-cracksoccurinthebricksoastoobtainaneffectofincreasingtoughnesorthroughfor-mationofsecondhightemperaturesolidphaseinthebrickbyadoptingadditive,Inaddition,itisneededtoimprovethequalityofthebrickappearanceandensureaccuratedimensionsofthebrick,Thepurposeofthispaperistofurtheriprovetheservicelifeoftherefractorybricksbymakinguseoftheimprovementmea-surestakenonthebasisoftheanalysisresultsoftheusedbricks.
简介:TheapplicationresultsofSemi-rebondedMagnesite-ChromebricksatRHlowervessloftheNKKCorporationKeihinWorkshavebeenanalysed.Theresultsindicatethatthemainreasonsthatcausethedamageoftherefractorybricksincludechemicalat-tackofslagtotheSemi-rebondedMagnesite-Chromebricks;penetrationofmoltensteelandslagnintothebricks;andthermalspallingduetoteperaturefluctuationduringsteelmakingoperation.There-sulitsofmultipleeffectionofthesefactorsleadtoalternativeactionoferosion(chemiclattackandpenetration)andspalling(thermalspallingandstructurepeeling)resultinginthedamageofthebrick,Inordertoimprovetheperformanceofthebricks,itisnecessarytopromotetheresistancetoero-sionandthermalshockresistanceaswellastokeeptheauratedimensionsofthebrick.Themeasurestoimprovetheresistancetoerosionofmagnesite-chromebrickstakenbytheresearchersmainlyin-clude:loweringthecontentsofimpuritiesinthebricks(mainlyincludingSiO2,CaO,andnextFe2O3andAl2O3);promotingtheextentofdirectbondofthebrick;formingalargeamountofmagnesia-chromecompositespinelwell-distributedinthebricksthroughaddingalargeamountofsynthe-sizedmaterials;enhancingtheresistancetoerosionbyaddingalittleamountofhigh-effectiveaddi-tives,Improvementofthermalshockresistanceofthebricksismainlythroughintroducingsomeaddi-tivetomakeacertainamountofmicro-cracksoccur-inginthebricksoastoobtaintheeffectofincreasetoughnessorthroughformationofsecondhightem-perturesolidphseinthebrickbyadoptingaddi-tive,Inddition,itisneededtoimprovethequalityofthebrickappearanceandensureaccuratedimen-sionsofthebrick,Thepurposeofthispaperistodescribethefurtherimprovementoftheservicelifeofrefactorybrickbythemeasurestakenonthebasisofthenalysisresultstotheusedbricks.
简介:摘要为了解决传统模型结构确定难,导致过拟合,预估准确性较差,稳定性低的问题。通过数据相关性分组挖掘研究建筑钢材造价成本预估模型。按照各项目特征获取历史工程项目钢材造价特征指标属性集合,通过模糊模式识别,依据就近原则对待筛选样本项目和待预估样本项目的相符程度进行判断,得到和待预估项目最相近的若干历史项目当成建立预估模型的输入样本。基于最小二乘支持向量机进行数据相关性分组挖掘,建立建筑钢材造价成本预估模型。在建立模型中,正则化参数与核函数的宽度是影响建筑钢材造价成本预估结果的主要参数,通过粒子群算法获取两个参数的最优值。把得到的参数值带入模型,重新进行训练学习,获取较优的建筑钢材造价成本预估模型。在进行实验时,选择杆塔钢材、基础钢材和接地钢材三个指标作为建立模型的输入向量进行测试,结果表明建立模型预估精度高,稳定性好。