燃煤电站锅炉优化吹灰系统研究

华中科技大学硕士学位论文燃煤电站锅炉优化吹灰系统研究姓名：刘刚申请学位级别：硕士专业：热能工程指导教师：陆继东20060417I300MW300MWDASCFCFJGBEBLIIABSTRACTAshdepositionandslaggingonboilerheatexchangesurfacesarecommonphenomenainfossilfuelfiredpowerplants.Thisthesisfocusesonthebuildingasuitablemodelofsootdepositionstatusofheattransfersurfaces,analysisofsootblowingeconomicsandconstructsanoptimizedsootblowingsystemforheatexchangesurfacesbasedonthebuiltmodel.Alloftheworkisbasedona300MWboiler.First,thethesismakesacomparisonofotherfoulingmonitoringsystemsandoptimizedsootblowingsystemsforheatexchangesurfacesinboilers.Thenthethesisintroducesthesubjectofthispaper.BasedonthedatafromDASofpowerplantsandusingheatingbalancetheory,thethesisputsforwardsfoulingmonitoringmodelsforheatexchangesurfacesinboilersincludingfurnace,superheaters,reheatersandeconomizer.Thewholefoulingmonitoringoffurnaceisbuilt,basedonoutletgastemperatureoffurnaceasparameter.Usingpressuredifferencemethod,thefoulingmonitoringmodelforrotary-typeairpreheaterisbuilt.Cleanlinessfactor(CF)isusedtoassessthefoulingstatuesoftheothersurface.Andthenanintroductionofboilersootblowingsystemwaspresented,includingthemechanismandstyleofsootblower,theexistentsootblowingsystem.Themajoreconomicparameterswhichmostrelevanttothesootdepositionandsootblowingweresummarized,alsothecalculatingmodelwasestablished.Onthesebasis,theon-linemonitoringsystemofboilerheatexchangesurfaceswasconstructed.Afuzzyrecognitionsystemutilizingfuzzyrecognitionmethodwasbuiltonthebasisofheatsurfacemonitoringandeconomicanalysis.TheinputparametersareCF(Cleanlinessfactor),JG(economicfactor),BE(walltemp-erature),andoutputisBL(thedegreeofconfidenceofsootblowing).Throughtheadjustmentofsootthreshold,thesootblowingeconomywasoptimized.Finally,thethesissummarizesthestudiesandputsforwardproblemsforfurtherstudies.Keywords:depositionslaggingfoulingon-linemonitoringoptimizingsootblowingfuzzymodelconvectionheatsurfacefurnace111.120041900082%6070/(KW·h),50%100[1]1.221.2.10.1W/(m·K)(11)(2.5mm)1/21/3[2-3]30%60%125MW15301%2%200MW15180.9%1.2%1-12/WmK⋅/WmK⋅1.11.71042020040100.033.01%1%500MW800/31.2.2SCl0.82.6mm/5mm/500MW1020100”2/350%[4]1.2.319933101#4—1.3[5]——54681.41%0.7%[6]0.1%[7]1.5[827]61.5.112[1114]37Afonso[24]4[2830]1.5.22070[31]EPRI19938EPRI20023EPRILehigh2070NOxNOx(EnergyResearchCenter)NOx()SmartProcessTMDCSHoneywell20909PCAGEOptifireDIAMONDPOWERWindowsABBOPTIMAX(BoilerCleanliness)Queen2080[32-42][38-39][40-41][42]101.63#300MWDAS112DCS2.11025t/h∏2-12-12-1MPa18.5680333t/h5.1(MCR)/31.7(ECR)377%23t/h1.3(MCR)/5.4(ECR)%62kg/s900%10.7%0.5mmH2O-2~-6%15541%3.5~4.0MPa17.60144.3541MPa4.17395kg/s939.5kg/s831.25MW300122-1——————————54013————5402.2''lqz[4]''0.63011lallajpjTTFaTMBVCsyj=⎡⎤+⎢⎥⎢⎥⎣⎦(2-1)14''lTKaTK0s8245.6710/(.)WmK-×pjVC1/(.)kJkgKjB/kgsjla(1)hylhyhyaaaay=+-hyayxitsqqy=xzxiq2/Wmtsq2/WmM0.560.5mMx=-mxlF2m''()/xijpjallqBVCTTFj=-(2-2)2-22-13/53''0''()1alaallxiTaTTTMTqsy⎡⎤--=⎢⎥⎣⎦(2-3)153''5/302/3''1lalxialaTTMqTTsy=⎛⎞-⎜⎟⎝⎠(2-4)/xitsqqy=2-4tsq3''5/302/3''1laltsalaTTMqTTs=⎛⎞-⎜⎟⎝⎠(2-5)2-22-5xitsqxqxyz==z''5/35/33''5/30()jpjalxitslallBVCTTqxqxaMTTFxjyzs-===(2-6)lay2-62.3[43-45]2.3.1CF162-7200jzsxxxjBPPBaa⎛⎞Δ=Δ×⎜⎟⎜⎟⎝⎠(2-7)zsPΔxPΔPa0axa0jBxjBkg/h5%2-7O22-822121Oa=-(2-8)DCS2-72-922,02,021-21-xzsxxOMWPPOMW⎛⎞Δ=Δ×⎜⎟⎜⎟⎝⎠(2-9)2,0O2,xO5%0MWxMWMWCFlxzsPΔ2-9sjzsPΔlxzssjzsPCFPΔ=Δ(2-10)2.3.2172.42.4.13RfCF18CF2.4.2sjklxksjklxk2.4.3[46-47]()'/dxjQDiiB=-(2-12)dxQ——kJ/kgD——kg/s'ii——kJ/kgsjlxkCFk=19jB——kg/sfQ()'f/QdxjQDiiB=--(2-13)()0'ldfIIIQaΔ+-Φ=(2-14)Φ——'II——kJ/kg0lI——kJ/kgaΔ——()'0dflfhQIIIQa=Φ-+Δ-(2-15)fhQdxdfQQ='I'()giTftI=(2-16)()ft——giT——2-15lndxdxtttttΔ-ΔΔ=ΔΔ(2-17)tΔ——dtΔ——xtΔ——20dtΔxtΔ1.7dxttΔ≤Δ1()2dxtttΔ=Δ+Δ(2-18)2-16sjK)/(HtQBkdcjsj⋅Δ⋅=(2-19)dcQ——kJ/kgsjk——kW/(m)tΔ——H——m22.4.42.4.4.12-32-31.dafa1dfaaaqtwtsrwrs212.hdhl3.mddtΔ4.gdgl5.2a51211ghmhmgRdddallla=++++(2-20)k(kW/(m)):11112kghmhmgdddallla=++++(2-21)12111lxkaa=+(2-22)0.650.330.2()PrdzswdCCdvla=(2-23)——kW/(m)d——mw(m/s)v22Pr——Prpchl=hpclzC——sC——2230.60.330.358()PrdzswdCCdvla=(2-24)841()14.91021lbbfbTaTaTTTa--+=×-(2-25)baa——TT——bT——l——2250.80.420.023()Prwddvla=(2-26)ldmwm/svPr232.4.4.222612111(1)lxfdxkQQaa=++(2-27)(1)fdxQQ+1a22712()2dfdsxpaxaa=+(2-28)xdm2smx2.4.52-352-31.12.DAS3.244.DCS2-42.4.6DCS252-5CF2.5300MWCF2633.13.1.1Ebrahinmi-Sabet[47]Kaliazine[48]Kermani[49]27Uloth[50]Kaliazine[51][52]()()()3.1.2[53](1)(2)283.1.2.11,300,,,,150304023///294,3.1.2.212303.1.31243-13-1690.55kW107481.5kW1R14R33915R48R41951.5W35720.55kW143-13-131p=18.9MPat=450p=18.85MPat=495p=1.31.96MPat=3002.62MPa2.76MPa2352043303.2”3.2.13210[54]xNOxNOxNOxNOxNOxNOxNOxNO3.2.21()23333.2.33-23-2xNO3.3xNO3.3.12q34042()(100)pypylkrIIqqQa--=(3-1)pyI0lkIpyarQ4q4qDCSDCS4q=1%4q=2%4q=3%4q=4%2eq100%75%50%2q22beqqqhΔ=Δ=-(3-2)pyφb2,pe1000Pe=pyMarnetbYQhthhhΔφ∑(3-3)Pe,arnetQphehbhMYt3.3.2Larson-Miller[55-56](lg)()TCPts+=(3-4)TCt()PssL-M35(lg)TCt+=(3-5)36[57]max211()1cTTMtttqdbmlba=+Δ+++(3-6)tTtΔbmMlmaxqd2a0T0tTt001(1)/()ttthttΔ=-(3-7)tljlsYjh=Δ∑(3-8)sY3.3.370%80%90%100%yfj000()()(1)()yfdptFtNYpFtjt=-∑VV(3-9)0pV0()Ft0N()ptV()FttdY363.3.4xNOxNO70%80%90%100%xNOxNOxNOxNOxNOxNOCEMSxN