汽轮机性能试验中湿蒸气区焓值的计算方法

25320105JOURNALOFENGINEERINGFORTHERMALENERGYANDPOWERVo.l25,No.3May,2010:2009-04-20;:2009-11-23:(1978-),,,(),.:1001-2060(2010)03-0265-04汽轮机性能试验中湿蒸气区焓值的计算方法周留坤,沈发荣,严正波(云南电力试验研究院(集团)有限公司电力研究院,云南昆明650217):针对目前汽轮机湿蒸气区抽汽焓值计算模型的缺点,利用抽汽口级效率的概念建立了湿蒸气区抽汽焓值的计算模型,并利用国内三大汽轮机厂的原始数据对该模型进行了验证由湿蒸气区抽汽焓值的计算结果,拟合热力过程线得出排汽焓值通过能量平衡法对排汽焓值进行验算,该方法的特点是迭代计算量小,迭代计算3次内可完成计算,当最末一级处于湿蒸气区时,程序不需要迭代计算结果表明:该计算模型简单,程序移植性好,所需测点少,测点积累误差小,误差小于0.25%,计算精度高:;;;;:TK262:A,,,,,,ASMEPTC6A1982:(1),,,,,,;(2),,,11.1[1][1],,,,,,,,1.2helep,:hcq=hIp-hdslp:hcq;hIp;hds;lp,,;,11,[2]图1汽轮机低压缸热力过程线20101.3[3],12,h1;h1;h!1p1h1h!1h1:h1=(h!1+h1)/2,,,1.4[4]ASME62WA209,,:S=10hB-(h+Y)371.0+Ro(h-hB)+SB-Z,Ro=(SA-SB)+Z-10hB-(hA+Y)371.0(hA-hB)Z=10-(y/371.0):hASA;hBSB;ShGEY650,GE,Y,GEY24,,,70%,,,,,,,2:图2多级汽轮机热力过程线,,H0,1,[5],,,,,,:,1E7E8,E7:hE7=hE6-h6756:hE7E7;hE6E6;h67E6E7;56E5E6E8:hE8=hIp-hdslp:hE8E8,1E8,:hE8=hE7-h7867:hE8E8;hE7E7;h78E7E8;67E6E7∀266∀3,:图3热力线绘制过程143,E7,;E7,E8,ASMEPTC6A1982,E8,31E7,1300MW/%E82625.52626.70.05E7E82629.52628.70.03E82514.22512.30.08E7E72751.22755.90.17E82626.02629.90.15E72648.92648.10.03E82514.02518.00.16E72618.02623.30.20E82491.02495.40.182[6]E7E82668.562520.438376.898352.87[6]2668.502517.218376.958366.30/%0.0020.130.00070.162[6],:,,,2~34:E7,,;E7,E7E8,0.2%,,hE7=hE6-h6756,5667:=hE7-h!E7h!E7=hE6-h6756-(hE6-h6756)hE6-h6756=h67(!56-56)hE6-h6756=!56-56hE6/h67-!56=!56-56(hE6-h!E7+h!E7)/h67-!56=!56-56h!E7/h67!56-562:hE7E7;h!E7:1/2,0.5%,0.25%:∀267∀2010,,,,,5,,4:(1),(2),,excel(3),,,;,(4)300600MW:,,0.2%,3,:[1].[J].,1998,18(6):1-4.[2]COTTONKC.Evaluatingandimprovingsteamturbineperformance[M].NY:CottonFact,1998.[3].[J].,1998,31(10):53-54.[4]SPENCARRC,COTTONKC.Amethodforpredicitingtheperformanceofsteamturbinegenerators16500kWandlarger[R].GECorporation,1974.[5],,,.[M].:,1995.[6].[M].:,2005.(编辑何静芳)据#!∀#∃%&∃∋()∗+&,−.&∃+∗∃∃2009年3月号报道,被安装在/01-450蒸燃联合循环装置中的余热锅炉在运行过程中产生了汽水通路部件腐蚀以及浸蚀-腐蚀破坏问题在低压蒸发器(234)内的浸蚀-腐蚀磨损是典型的破坏(达到40%)对于具有水平受热面的立式余热锅炉,低压蒸发器弯头的浸蚀-腐蚀磨损和余热锅炉(51)停炉时受热面的停机腐蚀是金属被破坏所具有代表性的两种形式应用铬含量不少于0.3%的钢材并借助于使用不挥发的反应剂使液膜的pH值保持大于9.5,可以保证减少低压蒸发器部件在运行条件下的浸蚀-腐蚀磨损浸蚀-腐蚀磨损问题彻底的解决办法是通过完善余热锅炉的结构来达到应用基于十八烷基胺(647)的封存工艺可以保证受热面避免停机腐蚀,并有助于减少余热锅炉通流部分部件的浸蚀-腐蚀磨损借助于定期定点地把规定剂量的十八烷基胺加入低压蒸发器,可以大大降低弯头的浸蚀-腐蚀磨损()∀268∀3verywelladjusttheworkingpointofthecompressor,therebyplayinganimportantregulationroleinmodifyingthegasturbine.Tochangethegeometryofthepowerturbinecanevenbetterimprovetheoffdesignperformanceoftheuni.tKeywords:gasturbine,smalldeviationequation,variablegeometryturbine=AMethodforCalculatinganEnthalpyValueintheWetSteamZoneDuringthePerformanceTestofaSteamTurbine[,]/ZHOULiukun,SHENFarong,YANZhengbo(ElectricPowerResearchInstitute,YunnanElectricPowerTestAcademy(Group)Co.Ltd.,Kunming,China,PostCode:650217)//JournalofEngineeringforThermalEnergy&Power.-2010,25(3).-265~268Inthelightoftheshortcomingsofthemodelscurrentlyavailableforcalculatingtheextractedsteamenthalpyofasteamturbineinthewetsteamzone,aconceptofthestageefficiencyatthesteamextractionportwasadoptedtoestablishamodelforcalculatingtheaboveextractedsteamenthalpyandtheoriginaldatafromthethreelargestdomesticturbineworkswereusedtoverifythemodelinquestion.Thecalculationresultsfromtheextractedsteamenthalpyvalueinthewetsteamzonewereusedtoeffectafittingofthethermodynamicprocessandtoobtaintheexhauststeamenthalpyvalue.Byadoptinganenergybalancingmethod,theexhauststeamenthalpywasrechecked.Themethodfeaturesasmallamountofiterativecalculations,whichcanbecompletedinthreetimes.Whenthelaststageentersintothewetsteamzone,noiterativecalculationwillbeneeded.Ithasbeenfoundthatthecalculationmodelissimpleanditsprogramenjoysagoodprogramtransplantation,requiringfewermeasuringpointsandfeaturingasmallaccumulativeerrorofthemeasuringpointsassessedatlessthan0.25%andahighcalculationprecision.Keywords:steamturbine,stageefficiencyatthesteamextractionpor,twetsteamzone,enthalpycalculation,thermodynamicprocesscurve=NumericalCalculationoftheCombustionFlowFieldinaGasTurbineCombustorWithAirfilmHoles[,]/SONGShaole,iLITongqiao(HarbinSteamTurbineWorksCo.Ltd.,Harbin,China,PostCode:150046),LIJinying(CollegeofPowerandEnergySourceEngineering,HarbinEngineeringUniversity,Harbin,China,PostCode:150001)//JournalofEngineeringforThermalEnergy&Power.-2010,25(3).-269~272ByusingsoftwareFluen,tnumericallysimulatedwasthecombustionconditionofagasturbinecombustorwithairfilmholes.Duringthesimulation,thestandardk-8turbulentflowmode,la%simplechemicalreactionsystem&modeland%quickchemicalreaction&assumptionswereadoptedandtheSIMPLEalgorithmwasemployedtoseeksolutionsbasedonapressurespeedcoupling.Throughananalysisofthesimulationresults,thevariationtendencyofsuchparametersasexcessairratio,flamelengthandaveragewallsurfacetemperatureoftheflametubeetc.withloadchangeswasobtainedandcomparedwiththecorrespondingconditionwithoutairfilmcooling.Arelativelybigimprovementhasbeenmainlyrealizedinthecombustionminglinganddilution,aswellasflametubewallsurfacetemperature.Theconclusionthusobtainedhasacertainreferencevalueforstructuralimprovementandoptimizationofthecombustors.Keywords:gasturbine,combustor,airfilmhole,num