燃烧优化调整对NO_x排放和锅炉效率的影响
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摘要
为研究燃烧调整对NO_x排放和锅炉效率的影响,在330 MW煤粉炉机组满负荷运行工况下,通过调整过量空气系数、SOFA风开度、二次风配风方式、周界风开度以及燃烧器摆角,测定了尾部烟道SCR入口A、B两侧的NO_x排放浓度及其相关数据,并计算得到锅炉效率,研究了各因素对NO_x排放浓度和锅炉效率的影响。结果表明,运行氧含量较低时能降低NO_x浓度并保证较高的锅炉效率;倒塔配风的NO_x排放浓度比正塔配风和均等配风分别低约9.1%和7.8%,倒塔配风最低,正塔配风最高;锅炉效率随着SOFA风开度的减小呈先上升后下降趋势,而NO_x浓度呈递增趋势;随着周界风开度的逐渐增大,锅炉效率先减小后增加,而NO_x排放逐渐增大,周界风开度变化7%,锅炉效率变化1%左右;随着燃烧器摆角的增加锅炉效率先呈上升后呈下降趋势,而NO_x浓度呈下降趋势。
In order to study the effect of combustion optimization adjustment on NO_x emission and boiler efficiency,the NO_x emission concentration of tail flue in A and B sides was measured by adjusting the excess air coefficient,SOFA wind opening,secondary air distribution mode,surrounding air opening and burner swing angle.Besides,the boiler efficiency was calculated by recording the related data of DCS and collecting samples.Effect of combustion optimization adjustment on NO_x emission and boiler efficiency was researched.The results show that NO_x concentration can be reduced and higher boiler efficiency can be guaranteed by decreasing oxygen contents.The NO_x emission concentration of inverted tower is 9.1% and 7.8% lower than the normal tower and equal distribution wind,respectively.The inverted tower is the lowest and normal tower is the highest.The boiler efficiency increases with the increase of SOFA wind opening and later slightly decreases,while the concentration of NO_x increases with the increase of SOFA wind opening.With the increase of surrounding air opening,boiler efficiency firstly decreases and then increases,while the NO_x emissions increases gradually.The boiler efficiency changes about 1% with surrounding air opening increasing 7%.The boiler efficiency firstly increases and then decreases with the increase of burner swing angle.
In order to study the effect of combustion optimization adjustment on NO_x emission and boiler efficiency,the NO_x emission concentration of tail flue in A and B sides was measured by adjusting the excess air coefficient,SOFA wind opening,secondary air distribution mode,surrounding air opening and burner swing angle.Besides,the boiler efficiency was calculated by recording the related data of DCS and collecting samples.Effect of combustion optimization adjustment on NO_x emission and boiler efficiency was researched.The results show that NO_x concentration can be reduced and higher boiler efficiency can be guaranteed by decreasing oxygen contents.The NO_x emission concentration of inverted tower is 9.1% and 7.8% lower than the normal tower and equal distribution wind,respectively.The inverted tower is the lowest and normal tower is the highest.The boiler efficiency increases with the increase of SOFA wind opening and later slightly decreases,while the concentration of NO_x increases with the increase of SOFA wind opening.With the increase of surrounding air opening,boiler efficiency firstly decreases and then increases,while the NO_x emissions increases gradually.The boiler efficiency changes about 1% with surrounding air opening increasing 7%.The boiler efficiency firstly increases and then decreases with the increase of burner swing angle.
引文
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[2]张晓辉,孙锐,孙绍增,等.200 MW锅炉空气分级低NOx燃烧改造实验研究[J].热能动力工程,2008,23(6):676-681.ZHANG Xiaohui,SUN Rui,SUN Shaozeng,et al.Experimental study of an air-staged andlow NOxemission based combustion modification to a 200 MW boiler[J].Journal of Engineering for Thermal Energy and Power,2008,23(6):676-681.
[3]吕玉坤,彭鑫.300 MW燃煤锅炉NOx排放特性试验研究[J].华北电力大学学报(自然科学版),2010,37(5):78-82.LYU Yukun,PENG Xin.Experimental study on the characteristics of NOxemission with 300 MW coal-fired boiler[J].Journal of North China Electric Power University(Natural Science Edition),2010,37(5):78-82.
[4]张晓宇.600 MW低NOx切圆炉膛燃烧优化分析[J].中国电机工程学报,2016,36(S1):140-146.Zh ANG Xiaoyu.Analysis of combustion optimization on 600 MW low nitrogen tangentially coal-fired boiler[J].Proceeding of the CSEE,2016,36(S1):140-146.
[5]石践,陈玉忠,侯玉波,等.W火焰锅炉燃烧优化与改造技术研究和工程应用[J].中国电机工程学报,2016,36(22):6187-6192.SHI Jian,CHEN Yuzhong,HOU Yubo,et al.Investigations on the combustion optimization&modification of w-flame boilers and engineering applications[J].Proceeding of the CSEE,2016,36(22):6187-6192.
[6]周建新,樊征兵,司风琪,等.电站锅炉燃烧优化技术研究发展综述[J].锅炉技术,2008,39(5):33-36.Zh OU Jianxin,FAN Zhengbing,SI Fengqi,et al.A review about the development of boiler combustion optimization technology[J].Boiler Technology,2008,39(5):33-36.
[7]梁绍华,李秋白,黄磊,等.锅炉在线燃烧优化技术的开发及应用[J].动力工程学报,2008,28(1):33-35.LIANG Shaohua,LI Qiubai,HUANG Lei,et al.Development and application of the on-line boiler bombustion optimization technology[J].Journal of Chinese Society of Power Engineering,2008,28(1):33-35.
[8]李素芬,刘丽萍,陈贵军,等.配风方式对四角切圆煤粉锅炉燃烧特性影响数值分析[J].大连理工大学学报,2010,50(4):491-496.LI Sufen,LIU Liping,CHEN Guijun,et al.Numerical analyses of effect of air distribution on combustion characteristics of tangentially pulverized coal-fired boiler[J].Journal of Dalian University of Technology,2010,50(4):491-496.
[9]李建强,汪安明,潘文凯,等.燃煤电站锅炉低NOx燃烧运行参数优化[J].动力工程学报,2016,36(5):337-342.LI Jianqiang,WANG Anming,PAN Wenkai,et al.Operating parameter optimization for Low NOxcombustion of coal-fired boiler[J].Journal of Chinese Society of Power Engineering,2016,36(5):337-342.
[10]陈冬林,叶托,李恒.低NOx燃烧技术研究现状及进展[J].热力发电,2017,46(3):1-6.CHEN Donglin,YE Tuo,LI Heng.Review on low NOxcombustion techniques[J].Thermal Power Generation,2017,46(3):1-6.
[11]岳峻峰,梁绍华,宁新宇,等.600 MW超超临界锅炉墙式切圆燃烧系统的特点及性能分析[J].动力工程学报,2011,31(8):598-604.YUE Junfeng,LIANG Shaohua,NING Xinyu,et al.Structural features and performance analysis of wall-arrangement tangential firing system for a 600 MW ultra supercritical boiler[J].Journal of Chinese Society of Power Engineering,2011,31(8):598-604.
[12]尚达,李宝宽,李永福,等.1 000 MW超超临界锅炉燃烧优化调整对NOx排放及锅炉热效率的影响[J].热能动力工程,2017,32(3):61-68.SHANG Da,LI Baokuan,Li Yongfu,et al.Effect of combustion optimization adjustment of 1 000 MW ultra supercritical boilers on NOxemission and boiler efficiency[J].Journal of Engineering for Thermal Energy and Power,2017,32(3):61-68.
[13]李德育,姚季.炉内配风方式对锅炉NOx排放影响的试验研究[J].现代电力,2010,27(4):69-72.LI Deyu,YAO Ji.Experimental study on the influence of air distribution in furnace on the NOxemissions in a boiler[J].Modern Electric Power,2010,27(4):69-72.
[14]杨玮,李文秀,郭富德,等.330 MW发电机组贫煤燃烧NOx排放特性及控制[J].洁净煤技术,2017,23(6):107-112.YANG Wei,LI Wenxiu,GUO Fude,et al.Emission characteristics and controlling of NOxin lean coal-fired boiler of the 330 MW unit[J].Clean Coal Technology,2017,23(6):107-112.
[15]黄天旭,王聪玲,谭厚章.燃烧器配风方式对NOx排放影响的试验研究[J].热力发电,2008,37(5):36-39.HUANG Tianxu,WANG Congling,TAN Houzhang.Test study on influence air-distributing mode for burners upon low emission of NOx[J].Thermal Power Generation,2008,37(5):36-39.
[16]周光宇,胡安,谭云松.燃烧器摆角对锅炉安全经济运行的影响[J].电站系统工程,2011,27(5):65-66.ZHOU Guangyu,HU An,TAN Yunsong.Impact of burner tilt angle on secure&economic operation of boiler[J].Power System Engineering,2011,27(5):65-66.
[17]李代力,王智化,许岩韦,等.燃尽风配风比例对1 000 MW超超临界锅炉炉内燃烧过程影响的数值模拟[J].能源工程,2012(4):1-5.LI Daili,WANG Zhihua,XU Yanwei,et al.Numerical simulation of combustion process for an 1 000 MW ultra-supercritical boiler at different air distribution proportions[J].Energy Engineering,2012(4):1-5.
[18]许昌,吕剑虹,郑源,等.以效率和低NOx排放为目标的锅炉燃烧整体优化[J].中国电机工程学报,2006,26(4):46-50.XU Chang,LYU Jianhong,ZHENG Yuan,et al.A boiler combustion global optimization on efficiency and low NOxemissions object[J].Proceeding of the CSEE,2006,26(4):46-50.