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1、第43卷第5期熱力發(fā)電Vo1.43NO.52014年5月THERMALP0WERGENERATIONMay2014各因素測量不確定度對(duì)鍋爐熱效率測試質(zhì)量的影響呂當(dāng)振,段學(xué)農(nóng),陳一平,焦慶豐,楊劍鋒(湖南省電力公司科學(xué)研究院,湖南長沙410007)[摘要]介紹了不確定度分析原理和各因素不確定度分量A類、B類評(píng)定方法,建立了鍋爐反平衡熱效率不確定度分析模型,給出了靈敏系數(shù)、合成不確定度的計(jì)算方法。在此基礎(chǔ)上,以某電廠600MW機(jī)組鍋爐為計(jì)算對(duì)象,在消除了因素非完全獨(dú)立和傳統(tǒng)數(shù)值擾動(dòng)計(jì)算靈敏系數(shù)方法帶來的二次不確定度的前提下,研究了各因素測量不確定度對(duì)鍋爐熱效率測試質(zhì)量的影響;定量給出了各因素測量
2、不確定度對(duì)鍋爐反平衡熱效率測試質(zhì)量的貢獻(xiàn)。結(jié)果表明,重要影響因素為,飛灰含碳量Cfh、排煙溫度t。、收到基灰分A?收到基低位發(fā)熱量Q、飛灰百分比am;可忽略因素為,收到基氮N、收到基硫S?鍋爐散熱損失Q。因此,提高重要影響因素的測試精度可顯著提高鍋爐熱效率的測試質(zhì)量。[關(guān)鍵詞]鍋爐;熱效率;不確定度模型;靈敏系數(shù);二次不確定度[中圖分類號(hào)]TK229.6[文獻(xiàn)標(biāo)識(shí)碼]A[文章編號(hào)]1002—3364(2014)05—0054—05IDOl編號(hào)]10.3969/j.issn.1002—3364.2014.05.054Effectofmeasurementuncertaintyontestqua
3、lityofboilerthermalefficiencyLVDangzhen,DUANXuenong,CHENYiping,JIAOQingfeng,YANGJianfeng(HunanElectricPowerCorporationResearchInstitute,Changsha410007,China)Abstract:TheanalysistheoryofuncertaintyandtheassessmentmethodofuncertaintyfactorsintypeAandtypeBwereintroduced.Theuncertaintyanalysismodelofbo
4、ilerthermaleffciencywasestablished.Moreover,thecalculationmethodsofsensitivitycoefficient,normalcombineduncer—taintyandextendeduncertaintywereputforward.Onthisbasis,a600MWunitcoal—firedboilerwastakenastheexampletoinvestigatetheeffectsofeachfactorSmeasurementuncertaintyontestqualityoftheboilertherma
5、lefficiency.Toavoidthesecondarymeasurementuncertainty,theuncertaintyfactorswithincompletelyindependenceandthesensitivitycoefficientbyconventionalimprecisenumericalcalculuswereeliminated.Theresultsindicatesthat,theparametershavingsignificantcontributionstotestqualityoftheboilerthermalefficiencyareun
6、burnedcarboncon—tentinflyash(Cfh),averageexhausttemperature(tpy),ashcontentas—receivedbasis(Aa),lowhearingvalueas-receivedbasis(Qt)andflyashcontent(Dfh),inadecreasingorder;andtheneg—lectableDarametersarenitrogencontentas—receivedbasis(N),sulfurcontentas—receivedbasis(S)andsurfaceradiationandconvect
7、ionloss(Q5).Therefore,inordertoimprovethetestqualityofboilertherma1efficiencYdistinctly,itisworthwhiletolowertheuncertaintyofthesignificantparameters.Keywords:boiler;heatefficiency;uncertaintymodel;sensitiv