全负荷脱硝技术在超临界燃煤机组的应用
|
摘要
在低负荷阶段,广东珠海金湾发电有限公司(以下简称"金湾电厂")两台锅炉的脱硝系统因烟温低而退出运行,造成烟气污染物的超标排放。为了使低负荷时氮氧化物(NO_x)的排放达到最新环保要求,金湾电厂对锅炉进行了脱硝改造:首先在锅炉尾部烟道加装了脱硝装置并对省煤器进行分级改造,然后进行低氮燃烧调整以及启停机运行的优化。改造后,烟囱出口NO_x的质量浓度小于30mg/m~3(标准状态下),40%~60%负荷阶段脱硝装置投运率100%,有效地减少污染物的排放,较好地解决锅炉因烟温低而脱硝系统不能投入运行的问题。
In the stage of low load,denitration systems of two boilers in Guangdong Zhuhai Jinwan power generation co.,ltd.(hereinafter referred as Jinwan power plant)was out of service due to low gas temperature which caused discharge beyond standards of flue gas pollutants.In order to ensure emission of NO_x satisfy the newest environmental protection requirement at the time of low load,Jinwan power plant conducted denitration transformation for the boiler which was firstly to add denitration device for the tail flue of boiler and carry out classification transformation for the economizer,then make adjustment for low nitrogen combustion and optimization on start and stop of the unit.After transformation,per hour average material quality concentration of NO_x at the exit of chimney is less than30 mg/m~3 in standard condition and operational percentage of denitration device in 40%~60%load stage reaches to 100% which effectively reduces emission of pollutants and well solves the problem of the denitration system being unable to be put into operation for reason of low gas temperature.
In the stage of low load,denitration systems of two boilers in Guangdong Zhuhai Jinwan power generation co.,ltd.(hereinafter referred as Jinwan power plant)was out of service due to low gas temperature which caused discharge beyond standards of flue gas pollutants.In order to ensure emission of NO_x satisfy the newest environmental protection requirement at the time of low load,Jinwan power plant conducted denitration transformation for the boiler which was firstly to add denitration device for the tail flue of boiler and carry out classification transformation for the economizer,then make adjustment for low nitrogen combustion and optimization on start and stop of the unit.After transformation,per hour average material quality concentration of NO_x at the exit of chimney is less than30 mg/m~3 in standard condition and operational percentage of denitration device in 40%~60%load stage reaches to 100% which effectively reduces emission of pollutants and well solves the problem of the denitration system being unable to be put into operation for reason of low gas temperature.
引文
[1]GB13223—2011,火电厂大气污染物排放标准[S].
[2]颜学升,高琴,张廷发,等.燃煤锅炉烟气脱氮技术[J].锅炉技术,2010,41(2):76–80.YAN Xuesheng,GAO Qin,ZHANG Tingfa,et al.The Flue Gas De-NOx Technique in Coal Fired Boilers[J].Boiler Technology,2010,41(2):76-80.
[3]陈进生.火电厂烟气脱硝技术——选择性催化还原法[M].北京:中国电力出版社,2008.
[4]杨宏民,段景卫,兰增林.低氮燃烧加SNCR脱硝技术在超临界锅炉上的应用[J].电站系统工程,2011,27(2):30–YANG Hongmin,DUAN Jingwei,LAN Zenglin.Application of Low NOxCombustion and SNCR Denitration Technology in Supercritical Boiler[J].Power System Engineering,2011,27(2):30-31.
[5]黄文静,戴苏峰,艾春美,等.电站燃煤锅炉全负荷SCR脱硝控制技术探讨[J].节能技术,2015,33(2):189–192.HUANG Wenjing,DAI Sufeng,AI Chunmei,et al.Discussion about SCR Denitration Control Technology Under Full Load in a Coal-fired Boiler[J].Energy Conservation Technology,2015,33(2):189-192.
[6]康学占.提高SCR脱硝装置负荷适应性的可行性分析[J].发电设备,2015,29(3):225–230.KANG Xuezhan.Feasibility Analysis on Improving Load Adaptability of SCR DenitrificatiOn Systems[J].Power Equipment,2015,29(3):225-230.
[7]罗江勇,吕新乐.锅炉低负荷工况下脱硝系统投运率提高的改造技术[J].中国电力,2015,48(11):138–141.LUO Jiangyong,LXinle.Retrofit for SCR Equipment Operation Rate Improvement Under Low Load Conditions on600-MW Supercritical Boiler[J].Electric Power,2015,48(11):138-141.
[8]侯剑雄,刘洋.电厂燃煤锅炉降低NOx排放运行调整[J].东北电力技术,2015(1):25–29.HOU Jianxiong,LIU Yang.Operation and Adjustment for NOxDischarge Reduction in Power Plant Coal Boiler[J].Northeast Electric Power Technology,2015(1):25-29.
[9]邵建明,曹慰,周勇.600 MW四角切圆燃烧锅炉低氮燃烧改造技术优化[J].锅炉技术,2014,45(4):45–48.SHAO Jianming,CAO Wei,ZHOU Yong.Low-NOx Combustion Technology Optimizatiao on600 MW Tangential Firing Boiler[J].Boiler Technology,2014,45(4):45-48.
[10]张建文,吴蓓玲,张维侠,等.锅炉负荷变化对NOx排放浓度的影响[J].发电设备,2010(5):343–346.ZHANG Jianwen,WU Beiling,ZHANG Weixia,et al.Influence of Boiler Load Variation on Concentration of NOxEmission[J].Power Equipment,2010(5):343-346.
[2]颜学升,高琴,张廷发,等.燃煤锅炉烟气脱氮技术[J].锅炉技术,2010,41(2):76–80.YAN Xuesheng,GAO Qin,ZHANG Tingfa,et al.The Flue Gas De-NOx Technique in Coal Fired Boilers[J].Boiler Technology,2010,41(2):76-80.
[3]陈进生.火电厂烟气脱硝技术——选择性催化还原法[M].北京:中国电力出版社,2008.
[4]杨宏民,段景卫,兰增林.低氮燃烧加SNCR脱硝技术在超临界锅炉上的应用[J].电站系统工程,2011,27(2):30–YANG Hongmin,DUAN Jingwei,LAN Zenglin.Application of Low NOxCombustion and SNCR Denitration Technology in Supercritical Boiler[J].Power System Engineering,2011,27(2):30-31.
[5]黄文静,戴苏峰,艾春美,等.电站燃煤锅炉全负荷SCR脱硝控制技术探讨[J].节能技术,2015,33(2):189–192.HUANG Wenjing,DAI Sufeng,AI Chunmei,et al.Discussion about SCR Denitration Control Technology Under Full Load in a Coal-fired Boiler[J].Energy Conservation Technology,2015,33(2):189-192.
[6]康学占.提高SCR脱硝装置负荷适应性的可行性分析[J].发电设备,2015,29(3):225–230.KANG Xuezhan.Feasibility Analysis on Improving Load Adaptability of SCR DenitrificatiOn Systems[J].Power Equipment,2015,29(3):225-230.
[7]罗江勇,吕新乐.锅炉低负荷工况下脱硝系统投运率提高的改造技术[J].中国电力,2015,48(11):138–141.LUO Jiangyong,LXinle.Retrofit for SCR Equipment Operation Rate Improvement Under Low Load Conditions on600-MW Supercritical Boiler[J].Electric Power,2015,48(11):138-141.
[8]侯剑雄,刘洋.电厂燃煤锅炉降低NOx排放运行调整[J].东北电力技术,2015(1):25–29.HOU Jianxiong,LIU Yang.Operation and Adjustment for NOxDischarge Reduction in Power Plant Coal Boiler[J].Northeast Electric Power Technology,2015(1):25-29.
[9]邵建明,曹慰,周勇.600 MW四角切圆燃烧锅炉低氮燃烧改造技术优化[J].锅炉技术,2014,45(4):45–48.SHAO Jianming,CAO Wei,ZHOU Yong.Low-NOx Combustion Technology Optimizatiao on600 MW Tangential Firing Boiler[J].Boiler Technology,2014,45(4):45-48.
[10]张建文,吴蓓玲,张维侠,等.锅炉负荷变化对NOx排放浓度的影响[J].发电设备,2010(5):343–346.ZHANG Jianwen,WU Beiling,ZHANG Weixia,et al.Influence of Boiler Load Variation on Concentration of NOxEmission[J].Power Equipment,2010(5):343-346.