煤粉锅炉液化气点火装置的理论与实践

:1998-12-11:(1964-),,,145000295:1001-2060(1999)06-0447-03()()():,,,:;;;:TK22312,,,-,,,,,,12kg,,,1130t/h,,214m3/h,10kPa,0195,L=30m3/m3,C3H630%,C4H1070%(),VT=41cm/s,,,1,,,,,11(kg/m3)Qnet,or(kJ/m3)2.0037910864762.110.12211,10kPa,(1)V=2ToProrTrPoPr(1)To,K;Tr,K;or,kg/m3;Po,kPa;Pr,kPa;Pr,kPa;V,m/s;(2)dr=q10601785V1K(2)1dr,mm;q,m3/h;K,0175(3)Lr=2dr(3)Lr,mm14(84)199911©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1,2212,,,,fcfrF1(4)F1=fc/fr=A[Bmn-C(m-1)(n-1)](4)A,A=1;B,(5);C,(6);m,(7)n,,(8)B=1+C(5)C=1-B(6)m=1+1LT0Tr(P0Pr)-0.23(7)n=1+1Loor(8)(5)(6)(7)(8):C;B;1;L,m3/m3;o,kg/m3dcLC,LA,Lk,dA,dk,(9)(10)(11)(12)(13),k40,A822dc=drF1(9)Lc=LA=415dc(10)LA=112dc(11)dA=dc+2LAtanA2(12)dk=dc+2LktanK2(13)213fhrfcF2(14)F2=fhr/fc=mn(1+hr)PCF1(PC-P)(14):,012;Pc,Pa,(15);P-,Pa,(16)Pc=2PrF1(15)P=0V212(16):,0185;V1,m/s3,dhr,Lhr,Vh,r,(17)(18)(19)3dh,r=dcF2(17)Lh,r=(dA-dh,r)/2tanh,r2(18)Vh,r=q(1+1L)Tcm10601785d2h,rT0(19)(17)(18)(19):h,r,14;Tcm,K2,42drLrF1dcLkLALk(mm)(mm)(mm)(mm)(mm)(mm)3.56.5604446931231283kAdkdAF2dh,rh,rLh,r(mm)(mm)(mm)(mm)4081301131.3280141368441999©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.51-2-3-4-4214Re,,,,,,p,,,,,,113DG130/39/450-M0118kg/s,5,33DG130/39/450-M1234567(m3/s)2.2210-43.3310-4510510-46.1110-46.6710-47.7810-48.8910-4(m3/s)6.3310-39.4910-31.4310-21.7410-21.9010-22.2110-22.5410-2(m3/m3)30303030303030()1450155316451756185018501850(m)0.550.680.770.891.101.101.10(kg/s)0.180.180.180.180.180.180.18(s)12608405584564204204204(1),1110m,1850,,,,(2),(3)DG130/39/450-M420s,,,12kg,5,2t(4000),4h,,,,,,111:,1990,111211:,1994,813B11:,1988,6141-1,1986,51511:,1988,21611:,1984,61711:,1985,101()94461©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Onthebasisofthewaterwallthermodynamictestofa600MWboilerunitandthroughtheuseofafinite2ele2mentanalyticalmethodananalysiswasconductedofthedynamicvariationwithheattransferconditionsofmem2branewaterwalltubewalltemperaturedistributionofalow2circulationratioboiler.Theanalysisaimsatidenti2fyingtheunderlyingbasiccauseofwaterwalltubewalltemperaturefluctuations.Theresultsoftheanalysisshowthatthebasiccauseleadingtothefluctuationsofthewaterwalltubewalltemperatureliesinthedeteriora2tionofin2tubeheattransfer.Inthecourseofaheattransferdeteriorationtakingplaceinsidethetubesofasin2gle2sideheatedwaterwallthetemperaturedifferencebetweenthefire2facingtubeinnerandoutertubewallsur2facehasarelativelysmalltime2dependentfluctuation.However,thewaterwallperipheraltemperaturediffer2encesuffersadrasticfluctuationtriggeredbythewalltemperaturefluctuationsofthefire2facingouterwall.Keywords:waterwall,temperaturefield,finiteelement=Exergy2economicEvaluationofaHeatExchangerPerformance[,]/WuShuangying(ChongqingUniversity)//JournalofEngineeringforThermalEnergy&Power.-1999,14(6).-437440Basedontheexergy2economicanalysisofheatexchangerheattransferandflowprocesstheauthorhascomeupwithaheatexchangerperformanceevaluationindex,theso2calledcriterion,definedasthetotalcostperunitquantityofheattransferred.Furthermore,conductedwastheexergy2economicanalysisandoptimizationofthreetypesofheatexchangers,i.e.,down2flow,cross2flowandcounter2flow.Themethodsemployedandre2sultspresentedinthispapercanserveasaguideduringtheperformanceevaluationofheatexchangers.Keywords:heatexchanger,exergy2economicanalysis,performanceevaluation=DevelopmentandFabricationofaComputer2basedVisualSys2temforThree2dimensionalTemperatureFields[,]/ZhangShishuai,LuoJun,ZhuMaoshu,etal(CentralUniversityofScience&Technology)//JournalofEngineeringforThermalEnergy&Power.-1999,14(6).-441442Describedinthispaperisacomputer2basedvisualsystemforthevisualizationtreatmentofathree2dimensionaltemperaturefieldencounteredinengineeringthermophysicsbytheuseofcomputergraphicandimagetech2niques.Theabove2citedsystemincludesavarietyofmodules,whichareusedforperformingsuchfunctionsasthemodelbuildingofthethree2dimensionaltemperaturefield,colormapping,setting2upofavisualmodel,ex2tractionofasectionalplane,thesettingofvisualangle,etc.ThesystemisdevelopedandrealizedonaWindows95platformwiththehelpofVisualC.Keywords:three2dimensionaltemperaturefield,visualsystem,modelbuilding=TheDesignandDevelopmentofaLarge2sizedAnthracite2firedSub2critical2pressureUtilityBoilerwithaTangentialfiringSystem[,]/ChenJirong,GaoFeng(HarbinBoilerCo.Ltd.)//JournalofEngineeringforThermalEnergy&Power.-1999,14(6).-443446Thepresentpaperdescribesthetechnicalfeaturesandoperationalachievementsofa300MWsubcritical2pres2sure,natural2circulationandanthracite2firedboilerdevelopedanddesignedbyHarbinBoilerCo.Ltd(HBC).Itfocusesonsomeeffectivetechnicalmeasurestakentoensureagoodignition,stablecombustionandthoroughburn2off,astablecombustionwithoutrelyingonoilsupportevenatlowloadsandcompletecombustionoflowvolatilecoalaswellasaslag2freeoperationandareductioninNOxemissions.Withrespecttotheburnerdesignaself2stabilizingcombustiontechnologyincorporatingdoubleprimaryairchanneldevelopedjointlybyHBCandQinghuaUniversityhasbeenadopted.ThisitemoftechnologywasawardedaChinaNationalGoldenPrizeforoutstandingcrea