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时间:2020-03-28
《四角切圆燃煤锅炉变SOFA风量下燃烧特性数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第12期动力工程学报V01.34No.122014年12月JournalofChineseSocietyofPowerEngineeringDec.2014文章编号:1674—7607(2014)12—0921—11中图分类号:TK229.6文献标志码:A学科分类号:470.30四角切圆燃煤锅炉变SOFA风量下燃烧特性数值模拟李德波,徐齐胜,沈跃良,邓剑(广东电网公司电力科学研究院华,刘亚明,广州510080)温智勇摘要:对某电厂660MW四角切圆燃煤锅炉增加了分离燃尽风(SOFA)的低氮改造,利用AnsysFluentl4.0软件进行了改造后燃
2、烧特性的数值模拟,并将数值模拟结果与实际测量数据进行对比,研究了炉膛速度场、温度场、组分场和NO,质量浓度的分布规律,分析了不同SOFA风门开度下燃烧器区域以及沿炉膛高度方向NO。质量浓度的变化.结果表明:低氮改造中增加SOFA后的温度分布较均匀,切圆形成较好,没有出现火焰贴墙现象;当SOFA风门开度由30%增大到100%时,燃烧器区域最高温度由1803K降低到1684K,最高温度降低119K;燃烧器区域NO,最高质量浓度由388mg/m3降低到259mg/m3,降低了129mg/m3;炉膛出口NO,质量浓度由487.9mg/m3降低到307.4mg/m
3、3,降低了180.5mg/m3;通过调节SOFA风门开度可有效降低炉膛出口NO,质量浓度.关键词:四角切圆燃煤锅炉;低氮改造;N0,;数值模拟NumericalSimulationonCombustionCharacteristicsinaTangentially—firedBoilerwithVariableVolumesofSOFALIDebo,XUQisheng,SHENYueliang,(ElectricPowerResearchInstitute,GuangdongDENGJianhua-LlUYarning,WENZhiyongPowerGr
4、idCorporation,Guangzhou510080,China)Abstract:ToreducetheNO。emissionfroma660MWtangentially—firedboiler,alowN0,retrofitwascar—riedoutbyaddingseparatedoverfireair(SOFA)totheboiler。afterwhichnumericalsimulationwascon—ductedtothecombustioncharacteristicsusingAnsysFluent14.0software,an
5、dsubsequentlyacomparisonwasmadebetweenthesimulationresultsandactualmeasurements.Meanwhile,thein—furnacevelocitydis—tribution,temperaturefield,speciesfieldandNO,concentrationdistributionwerestudied,andtheN0:concentrationdistributionincombustionzoneandalongfurnaceheightwereanalyzed
6、atdifferentvolumesofSOFA.ResultsshowthatafterthelowNO,retrofitbyaddingSOFAtotheboiler,uniformtemperaturedistributionandidealtangentialfiringareachievedwithoutflameadheringtothewall.WhenthedamperopeningofSOFAvariesfrom30%to100%,themaximumtemperatureincombustionzonereducesfrom1803K
7、to1684K,withareductionof119K;themaximumNO,concentrationincombustionzOnere-ducesfrom388mg/m3to259mg/m3,withareductionof129mg/m3;theNO。concentrationatfurnaceexitreducesfrom487.9mg/m3to307.4mg/m3,withareductionof180.5mg/m3。indicatingthattheNO,concentrationatfurnaceexitcanbeeffective
8、lyreducedbychangingthedamperopeningofSOF
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