简介:Inordertoimproveargonblowingefficiencyina40tonladle,numericalsimulationandwatersimulationexperimentsofthebottomargonflowwereperformed.Relationshipsamongtheladlemixingtime,slageyearea,differentblowingflowrates,anddifferentblowingpositions(0,0.56R,0.62R,0.67R)arediscussed.Resultsshowedthattheladlemixingtimedecreasedwhentheargonblowingbrickdistance(frombottomcenteroftheladle)increased,anddecreasedsignificantlywhentheblowingflowincreasedfrom70to130L/h.Whentheblowingflowincreasedandexceeded130L/h,thestirringeffecttendedtobestable,andtherewaslittleeffectontheladlemixingtime.Theslageyeareaincreasedastheargonbrickdistanceincreased,andwaslargerwhentheargonblowbrickwasneartheladlewall.Wallshearstresssignificantlyincreasedasthebrickdistanceincreasedandwasconcentratedattheslagwallneartheargonflowbrick;thisiscalledthemostseriouserosionwall.Theaveragewallshearincreasedexponentiallywithincreasingargonblowingbrickdistance.
简介:Owingtoacertainangleexistingbetweenabeltconveyorandtheparallelhoppers,andthehopperslocalizingawayfromthecenterlinesofablastfurnace,particlessizesegregationislikelytohappeninabell-lesstopblastfurnacewithparallelhoppers.Masteringthelawofparticlessizesegregationinhopperscouldhelptochoosebetterchargingparametersandoptimizeproductionandtechnicalindices.Asforthepreviousworksonburdensegregationatabell-lesstopblastfurnacewithparallelhoppers,moreattentionwaspaidtothefallingpointsegregationandthecircumferentialmassflowsegregationwhilechargingfromthetiltingchute,butignoringtheparticlesizesegregationinburdenhoppersasburdenfallsfromabeltconveyor,whichistherightbasisofanalyzingtheformer,andplaysasignificantroleincontrollingthegasdistributionintheblastfurnace.Thepresentworktakesternarymixturesofcokeinthreedifferentparticlesizestosimulatethesizesegregationofthecokechargedintothehoppersbyexperiments.Theeffectofthemainstrikingpointonsizesegregationisalsoinvestigated.TheresearchshowsthatthereexistsagoodlinearrelationbetweensegregationcoefficientkandthedimensionlessmainstrikingpointwhenusingtheequationC=C0ktoexpressthedegreeofsizesegregationinhoppers.Thelinearrelationisproposedforthefirsttimeandprovidesanewwaytopredictthesizesegregationinhoppers,whichformsatheoreticalbasisandtechnicalsupportforreducingthesizesegregationdegreeinhoppers.