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1、某电厂空气分级低NOx燃烧技术改造摘要：在燃煤电厂锅炉燃烧中，NOx生成浓度高，排放量大，严重影响大气环境品质。燃煤电站锅炉NOX的排放特性不但与燃烧技术有关，而且与煤种、炉温、锅炉容量、锅炉结构以及运行参数等因素有关。对电站锅炉NOX生成原理和降低NOX排放浓度的途径进行了介绍，通过对锅炉内采用低NOX燃烧器、燃料分级燃烧以及空气分级燃烧等几种低NOX燃烧技术的分析，得出采用空气分级降低NOX的排放是目前证明的最简便、投资最省的手段。具体到本课题就是通过某电厂实际使用情况，现场了解采用空气分级后不同的二次风配风情况下，NOx排放特性以及燃尽风开度对NOx排放特性的
2、影响。大量的炉膛温度数据表明，改造后炉膛温度场保持正常。SOFA开度对锅炉NOx排放量有直接影响且SOFA风大小变化后炉膛出口烟温和排烟温度无大幅变化，主燃区无超温。二次风配风调整对NOx排放量影响有限。氧量过高会使火焰上移，进而造成炉膛出口烟温和排烟温度偏高，运行时应注意氧量控制。关键词：燃煤锅炉；NOX；空气分级；SOFA。中图分类号：TP2AirclassificationofapowerplantwithlowNOxCombustionTechnologyAbstract:Inthecoal-firedpowerplantboilercombustion,N
3、Oxformationathighconcentrations,emissionsvolume,seriouslyaffectingthequalityofatmosphericenvironment.NOXemissionsfromcoal-firedboilers,itscombustioncharacteristicsnotonlyincludingtechnology,butalsocoal,furnace,boilercapacity,boilerstructureoroperatingparametersorotherfactors.Generatedo
4、ntheprincipleofutilityboilersandreduceNOXandNOXemissionconcentrationmeanswereintroducedtotheboilerthroughtheuseoflow-NOXburners,stagedcombustionoffuelandcombustionairstagingsomelowNOXcombustiontechnology,andanalyzetheuseofairgradingtoreduceNOXemissionsistoprovethemosteffectivemeasurest
5、oreduceNOXemissions.Specifictothisissueisthroughtheactualuseofapowerplant,thesceneatdifferentsecondaryairwiththewindcase,NOxemissioncharacteristics,andSOFAopeningoftheNOxemissioncharacteristics.Alargenumberoffurnacetemperaturedatashowthatthetransformationoflow-NOxburners,thefurnacetemp
6、eratureremainednormal.SOFAopeningoftheboilerNOxemissionshaveadirectimpactandthesizeofchangesinSOFA,afterthewindsmokeamoderatefurnaceexitgastemperaturewithoutsignificantchangesintheprimarycombustionzonewithoutover-temperature.TheadjustmentofsecondaryairwiththewindhaslessinfluentonNOxemi
7、ssions.Oxygenistooenough,theflameonthemove,andcausemildsmokefurnaceoutletgastemperaturerising,runningshouldpayattentiontooxygencontrol.Keywords:Coal-firedboiler;NOX;airclassification;SOFA.Classification:TP2.目录摘要IABSTRACT:II目录III1引言11.1低NOx燃烧技术的概况12某电厂1号炉低NOX燃烧系统52.1设备简介52.2试验依据83现场热态
