低压锅炉全烧高炉煤气改造研究

上海交通大学硕士学位论文低压锅炉全烧高炉煤气改造研究姓名：王语申请学位级别：硕士专业：动力工程指导教师：于立军;曹先常20090110ABSTRACTBFG4100BFG101000650900100BFG2BFGBFGBFGCOH2CH475BFGBFG140015003BFGBFGABSTRACTBFG4BFGBFG100BFG800ABSTRACTTHERESEARCHOFLOW-PRESSUREBOILERTRANSMATEDTOUSEBLASTFURNACEGASONLYABSTRACTThisarticlefromthelow-pressureboilerburningcasestudy,theBFG'sowncharacteristics,themechanismoftheboilercombustion,combustion,heattransfersystems,airsystems,ignitionsystems,securitysystemsandcontrolsystemsinareassuchasin-depthresearch,thedevelopmentoflowcalorificvaluecombustiontechnology,Ontheboilercombustionsystemequipment,fireequipment,securityequipmentandcontrolsystemstechnology,accordingtotheboilerandauxiliaryequipmenttooptimizeboilerratedpowerloadtoachievea4#100%ofthelow-pressureboilercombustionandstableoperationofBFG.(1)thecurrentlow-pressureboilersburninghighcalorificvalueoftheboilerfuel,with0to100%ofthecokeovengas,from0to65%ofblastfurnacegas,from0to90%oftheconvertergas,aswellasfrom0to100%oftheheavyoilburningcapacityofallgasworksThestatusofalltheneedsofthecokeovengasfireandsecurity.Thearticlestudiedthemechanismofcombustiongasboiler,theboilerequipmentmodifiedtoachievetheultimateABSTRACTabolitionoftheuseofcokeovengas,blastfurnacegastoachieve100%combustioncondition.(2)BFG,aswellasthephysicalpropertiesofcombustioncharacteristicsofthestudy.BFGblastfurnacegasisproducedintheprocessofsmeltingfurnaceofmixedgases,themaincombustiblecomponentsforCO,H2andCH4fewofwhichcannotbegas-75%,BFGbecauseofthelowcalorificvaluefuel,theatmosphereintheenvironmenttoleaveopenflameontheflame,Cannotburn,howtostablecombustionsafetyisakeyissue.BFGtheoryofcombustiontemperaturein1400~1500,inmostcircumstancesmustbeunderairandgastopreheatthecombustionstability.(3)BFGlowcalorificvalue,burningflameisdark,ultra-violetweak,theboilerisusedinflamedetectorscannotdetectthestabilityoftheflameburningBFGsignal,theimpactoftheboilercombustionreliabilityofthesecuritychain.Throughavarietyofflamemonitorstheselection,useofthelatesttypeofadjustableultravioletflamedetectors,toensurethedetectionoflow-pressureboilertoburnthewholeBFGflameburning.(4)Intheboilerheatingsurfaceisnotadjusted,BFGandcombustionairpreheatarenotthecase,theburnertoreform,improvetheabilityofburningBFG.Onthecombustionairdistributionsystemandthetransformationofthefurnaceflamedetectiondevicestomeettheneedsofastablecombustion.ABSTRACTThemodificationtechnologyoftheboilerforlowcalorificvaluefuelgasisthefirstcase,andlow-pressureboilerstoachieve100%combustionofBFGpurposeoftheenterpriseforyearsincomemorethan8,000,000yuan.Keywords:Boiler,BFG,burner,firedetectiondevices20091102009110200911011.1(BFG)(LDG)(COG)21002200m3BFG5070m3LDG300320m3COG200520072004422007200413.61-1Table1-1Gasproduction2004200520062007BFG14952206184914041902833521247967COG2252432232744723318202388245LDG1075421129805513623681558477BFG2338330298325315031858821-1COGFig.1-1thetrendsofBFGproductionandcrudesteelproduction1-2BFGFig.1-2BFGproductionandemissiontrends31.265BFGCE34VP18W19821198532198563198654198610COG0100LDG090BFG06501001.3BFG4BFG12BFG3BFG1.4BFG4100BFG52.170t/h1.64MPa1.81MPa26032011086.1891.39PH790.1ppmPH9.5111500s/cm62.221002200m35070m3300320m32-12-1Table2-1GaspropertiesCO%22.76.761.5CO2%23.92.415.4H2%3.459.32.2N2%50.03.020.3CH4%0.025.20.4C2H4%0.02.20.0C2H6%0.00.80.0C3H6%0.00.20.0O2%0.00.20.1H2S%0.00.00.0H2O%0.00.00.0kJ/Nm3324118741825841868BFG:CO,CO2,N2H2CH4CO25%H2CH4CO2,N215%,55%CO2,N27C02N2CO2,N2COG(100%)COG(10%)+LDG(90%)COG(35%)+BFG(65%)COG(10%)+LDG(25%)+BFG(65%)(100%)10g/kg200522-12-22-2BFGCOGLDGNm3/Nm30.62144.45241.5500Nm3/Nm31.45693.95642.2005Nm3/Nm30.04401.24260.0549Nm3/Nm31.50095.19902.2554kg/Nm30.03540.99910.0442Nm3/MJ0.19170.23760.1877Nm3/MJ0.44950.21110.26658Nm3/MJ0.01360.06630.0067Nm3/MJ0.46310.27740.2731kg/MJ0.01090.05330.0053%2.931123.90092.43532-2604.99.98102.32.3.1(1)(2)D(3)92.3.2(1)32mm38mm2.54mma2-12-2b2-1Fig2-1Verticalsuperheater2-2Fig2-2Horizontalsuperheater10c18.5kg/cm2G21030074m222-3Fig2-3Superheatergasandairflow11a40b10152442mm3,10012a4053mm1.22mm2-42-5b2-61802-4Fig.2-4Tubularairpreheater2-5Fig.2-5Someformoftubularairpreheaterarrangement13120123030242012a2-6Fig.2-6Rotaryairpreheater14)1(4602yHDnQxd−×=π(2-1)xdQm3sDmnrminyHmb21)(ρρ∆=KAQzj(2-2)Qzjm3sKA()m2Pakgm34COGLDGBFGOILCOGLDGBFG15LDGBFGCOG75BFGBFG+COGBFGCOGBFGLDGBFGLDGCOGBFGLDGCOGCOGBFGLDGOILCOGCOGBFGLDGOILCOG2-7Fig.2-7TheoriginalLow-pressurebolierburner162200mm5a11.2—10AF—SCM1300m3/min390mmAq1480rpm110KW75SF—FH315M4P125KW1470rpm3000V50Hz17b14—6BC—DCM(Y.Z)3300m3/min380mmAq1480rpm277KW74SF—FH355M4P295KW1480rpm3000V50Hz18c2.3.3DDD192-8Fig2-8BoilerassemblychartlevelviewD•202-9Fig2-9Boilerassemblychartverticalview2.4•2122B1BAHSAH1OILCOGLDGBFG1222B1BAHSAH1OILCOGLDGBFG122-10Fig.2-10Boilerfuelflowchart2-11Fig.2-11Boilerflowchart221—2—3—4—5—6—7—8—2.51Nm31kg1Nm3123456rQQQQQQQ=+++++(2-3)rQ100123456100qqqqqq=+++++(2-4)23()1123456100100brQqqqqqqQη==×=−++++(2-5)rQ1Nm3kJ/Nm31Q1qkJ/Nm32Q2qkJ/Nm33Q3qkJ/Nm34Q4qkJ/Nm35Q5qkJ/Nm36Q6qkJ/Nm32.5.1rQrdrairzqQQiQQ=+++(2-6)dQkJ/Nm3rikJ/Nm3,airQkJ/Nm3zqQkJ/Nm31Nm3rdQQ=(2-7)2.5