电站锅炉尾部烟道补燃秸秆气化气的计算分析
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摘要
针对普遍存在的锅炉再热汽温偏低和SCR低负荷无法正常投运问题,提出一种锅炉耦合秸秆气化炉并在尾部烟道补燃燃气的技术方案。以某350 MW超临界锅炉为例,分别对在低温再热器入口补燃和SCR入口补燃进行热力计算和经济性分析,计算结果表明:100%负荷下,在尾部烟道低温再热器入口补燃9 900 m~3/h的气化气时,可将再热汽温升高13.5℃,降低供电煤耗1.2 g/(kW·h);50%负荷下,可将SCR入口烟温升高15.4℃,同时再热汽温升高32.9℃,降低供电煤耗5.7 g/(kW·h)。在SCR入口补燃1 360 m~3/h的秸秆气时,将SCR入口烟温升高8.7℃。该技术方案采用热一次风作为气化剂和助燃空气,并具有再燃还原NO等的技术优势。
To solve the common problems of reheat steam temperature on the low side and the failure operation of SCR under low load,a technical program of boiler coupling straw gasifier and gas afterburning in the tail flue is put forwared.With a 350 MW supercritical boiler,the thermodynamic calculation and economic analysis of the afterburning at the entrance of the low-temperature reheater and the afterburning at the entrance of SCR are performed. The results show that,at 100% load condition,with afterburning 9 900 m~3/h gas before the low temperature reheater,the reheater temperature temperature is increased by 13.5 ℃ and the power supply coal consumption is reduced by 1.2 g/(kW·h). At 50% load,the 15.4 ℃ increase in the entrance flue gas temperature of SCR,combined with the 32.9 ℃ increase in thereheat steam temperature can reduce the power supply coal consumption by 5.7 g/(kW·h). Afterburning 1 360 m~3/h of straw gas before SCR leads to 8.7 ℃ increase in the entrance flue gas temperature of SCR. This technical program use hot primary wind for gasification agent and combustion-supporting air. It also has many technical advantages,such as NO reduction by reburning of straw gas.
To solve the common problems of reheat steam temperature on the low side and the failure operation of SCR under low load,a technical program of boiler coupling straw gasifier and gas afterburning in the tail flue is put forwared.With a 350 MW supercritical boiler,the thermodynamic calculation and economic analysis of the afterburning at the entrance of the low-temperature reheater and the afterburning at the entrance of SCR are performed. The results show that,at 100% load condition,with afterburning 9 900 m~3/h gas before the low temperature reheater,the reheater temperature temperature is increased by 13.5 ℃ and the power supply coal consumption is reduced by 1.2 g/(kW·h). At 50% load,the 15.4 ℃ increase in the entrance flue gas temperature of SCR,combined with the 32.9 ℃ increase in thereheat steam temperature can reduce the power supply coal consumption by 5.7 g/(kW·h). Afterburning 1 360 m~3/h of straw gas before SCR leads to 8.7 ℃ increase in the entrance flue gas temperature of SCR. This technical program use hot primary wind for gasification agent and combustion-supporting air. It also has many technical advantages,such as NO reduction by reburning of straw gas.
引文
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[12] 张兆民. 如何解决锅炉主、再热汽温偏低问题[J]. 河南科技,2012(24):57. ZHANG Zhao-min. How to solve the problem of the boiler primary and reheat steam temperatures being too low[J]. Henan technology,2012(24):57.
[13] 韩英昆,孟祥荣,牟琳,等.超临界火电机组再热汽温控制系统分析[J]. 山东电力技术,2010,(1):66-70. HAN Ying-kun,MENG Xiang-rong,MU Lin,et al.Analysis on RH control system on supercritical power generation unit[J]. Shandong Dianli Jishu,2010,(1):66-70.
[14] 陈冠益,高文学,颜蓓蓓,等. 生物质气化技术研究现状与发展[J]. 煤气与热力,2006,26(7):20-26.CHEN Guan-yi,GAO Wen-xue YAN Pei-pei,et al.Present research status and development of biomass gasification technologies[J]. Gas and Heat,2006,26(7):20-26.
[15] 袁振宏,吴创之,马隆龙. 生物质能利用原理与技术[M]. 北京:化学工业出版社,2016:190-191.YUAN Zhen-hong,WU Chuang-zhi,MA Long-long. Biomass energy utilization principles and techniques[M]. Beijing Chemical Industry Press,2016:190-191.
[16] 阎维平,鲁许鳌,沈冶,等.在超临界燃煤发电机组中整合秸秆气化发电方法,河北: CN102010757A[P]. 2011-04-13.YAN Wei-ping,LU Xu-ao,SHEN Ye,et al.Integrated straw gasification power generation method in supercritical coal-fired generating units,Hebei,CN102010757A[P]. 2011-04-13.
[17] 马隆龙,吴创之,孙立.生物质气化技术及其应用[M]. 北京:化学工业出版社,2003:182-183.MA Long-long,WU Chuang-zhi,SUN Li. Biomass gasification technology and its application[M]. Beijing Chemical Industry Press,2003:182-183.
[18] 鲍振博,靳登超,刘玉乐,等. 生物质气化中焦油的产生及其危害性[J]. 安徽农业科学,2011,39(4):2243-2244.BAO Zhen-bo,JIN Deng-chao,LIU Yu-le,et al. The generation and its haemfulness in process of biomass gasification[J]. Anhui Agricultural Science,2011,39(4):2243-2244.
[19] 范丽娟,简丽,王连军,等. 秸秆气化模型研究及参数优化分析[J]. 化学工程,2013,41(11):5-9.FAN Li-juan,JIAN Li,WANG Lian-jun,et al.Model of straw gasification ad optimization of parameters[J]. Chemical Engineering,2011,39(4):2243-2244.
[20] 孙俊威,阎维平,赵文娟,等.600 MW超临界燃煤锅炉生物质气体再燃的数值研究[J]. 动力工程学报,2012,32(2):89-95. SUN Jun-wei,YAN Wei-ping,ZHAO Wen-juan,et al.Numerical study on biomass gas reburning in a 600 MW supercritical coal-fired boiler[J]. Journal of Chinese Society of Power Engineering,2012,32(2):89-95.
[21] 刘春元,罗永浩,张睿智,等.生物质气化气还原NO的化学反应动力学机制及数值模拟[J]. 中国电机工程学报,2011,31(5):120-124. LIU Chun-yuan,LUO Yong-hao,ZHANG Rui-zhi,et al.Chemical kinetic mechanism and numerical simulation on NO reduction by biomass gasification gas[J]. Proceedings of the CSEE,2011,31(5):120-124.
[22] 张睿智,段佳,刘春元,等.焦油对生物质气化再燃还原NO的影响[J]. 燃烧科学与技术,2010,16(01):18-22. ZHANG Rui-zhi,DUAN Jia,LIU Chun-yuan,et al.Effect of tar on NO reduction by biomass gasification syngas reburning[J]. Journal of Combustion and Technology,2010,16(01):18-22.
[23] 王健行,阎维平,何东.空气预热器结合一次风加热凝结水的排烟余热利用系统节能分析[J].热力发电,2017,46(10):10-15.WANG Jian-hang,YAN Wei-ping,HE Dong. Energy conservation analysis for waste heat utilization system applying air preheater and using primary air to heat condensate water[J].Thermal Power Generation,2017,46(10):10-15.
[2] 胡蓉. 关于锅炉SCR全负荷适应性改造的探讨[J]. 中国科技信息,2015,3(1):179-181. HU Rong.Discussion SCR full load adaptation of the boiler[J]. China Science and Technology information,2015,3(1):179-181.
[3] 李励. 基于弹性回热技术的低负荷SCR脱硝系统性能研究[J]. 电力与能源,2016,37(06):740-745. LI Li. Performance of a Low-Load SCR De-NOx system based on the flexible feed water regeneration technology[J]. Power and Energy,2016,37(06):740-745.
[4] 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 Wen-jing,DAI Su-feng,AI Chun-mei,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.
[5] CHAE H J,CHOO S T,HOON C A,et al. Direct use of kinetic parameters for modeling and simulation of a selective catalytic reduction process[J]. Industrial & Engineering Chemistry Research,2000,39(5):1159-1170.
[6] SCHAUB G,UNRUH D,WANG J,et al. Kinetic analysis of selective catalytic NOx reduction(SCR) in a catalytic filter[J]. Chemical Engineering & Processing Process Intensification,2003,42(5):365-371.
[7] 杨志忠,张山鹰,罗志忠,等.全负荷工况投运的SCR烟气脱硝系统[P]. 四川:CN204962817U,2016-01-13.YANG Zhi-zhong,ZHANG Shan-ying,LUO Zhi-zhong,et al.SCR flue gas denitration system put into operation in full load condition[P]. Sichuan,CN204962817U,2016-01-13.
[8] 赵振宁,王晶晶,徐立伟,等.300 MW锅炉再热汽温低的原因分析及改造[J]. 中国电力,2012,45(12):21-25. ZHAO Zhen-ning,WANG Jing-jing,XU Li-wei,et al.Reasons and retrofits of low reheat steam temperature of 300 MW boiler[J]. Electric Power,2012,45(12):21-25.
[9] GB/13223—2011[S]. 火电厂锅炉大气污染物排放标准,2011.GB/13223—2011[S]. Emission standard of air pollutants for thermal power plant boilers,2011.
[10] 李德波,曾庭华,廖永进,等.600 MW电站锅炉SCR脱硝系统全负荷投运改造方案研究与工程实践[J]. 广东电力,2016,29(06):12-17. LI De-bo,ZENG Ting-hua,LIAO Yong-jin,et al.Research on transformation scheme for full-load operation of SCR denitration system of 600MW substation boiler and engineering practice[J]. Guangdong Electric power,2016,29(06):12-17.
[11] 周强泰,周克毅.锅炉原理(第三版)[M].北京:中国电力出版社,2013,7:129-130.ZHOU Qiang-tai,ZHOU Ke-yi. Boiler principle (third edition)[M]. Beijing China Electric Power Press,2013,7:129-130.
[12] 张兆民. 如何解决锅炉主、再热汽温偏低问题[J]. 河南科技,2012(24):57. ZHANG Zhao-min. How to solve the problem of the boiler primary and reheat steam temperatures being too low[J]. Henan technology,2012(24):57.
[13] 韩英昆,孟祥荣,牟琳,等.超临界火电机组再热汽温控制系统分析[J]. 山东电力技术,2010,(1):66-70. HAN Ying-kun,MENG Xiang-rong,MU Lin,et al.Analysis on RH control system on supercritical power generation unit[J]. Shandong Dianli Jishu,2010,(1):66-70.
[14] 陈冠益,高文学,颜蓓蓓,等. 生物质气化技术研究现状与发展[J]. 煤气与热力,2006,26(7):20-26.CHEN Guan-yi,GAO Wen-xue YAN Pei-pei,et al.Present research status and development of biomass gasification technologies[J]. Gas and Heat,2006,26(7):20-26.
[15] 袁振宏,吴创之,马隆龙. 生物质能利用原理与技术[M]. 北京:化学工业出版社,2016:190-191.YUAN Zhen-hong,WU Chuang-zhi,MA Long-long. Biomass energy utilization principles and techniques[M]. Beijing Chemical Industry Press,2016:190-191.
[16] 阎维平,鲁许鳌,沈冶,等.在超临界燃煤发电机组中整合秸秆气化发电方法,河北: CN102010757A[P]. 2011-04-13.YAN Wei-ping,LU Xu-ao,SHEN Ye,et al.Integrated straw gasification power generation method in supercritical coal-fired generating units,Hebei,CN102010757A[P]. 2011-04-13.
[17] 马隆龙,吴创之,孙立.生物质气化技术及其应用[M]. 北京:化学工业出版社,2003:182-183.MA Long-long,WU Chuang-zhi,SUN Li. Biomass gasification technology and its application[M]. Beijing Chemical Industry Press,2003:182-183.
[18] 鲍振博,靳登超,刘玉乐,等. 生物质气化中焦油的产生及其危害性[J]. 安徽农业科学,2011,39(4):2243-2244.BAO Zhen-bo,JIN Deng-chao,LIU Yu-le,et al. The generation and its haemfulness in process of biomass gasification[J]. Anhui Agricultural Science,2011,39(4):2243-2244.
[19] 范丽娟,简丽,王连军,等. 秸秆气化模型研究及参数优化分析[J]. 化学工程,2013,41(11):5-9.FAN Li-juan,JIAN Li,WANG Lian-jun,et al.Model of straw gasification ad optimization of parameters[J]. Chemical Engineering,2011,39(4):2243-2244.
[20] 孙俊威,阎维平,赵文娟,等.600 MW超临界燃煤锅炉生物质气体再燃的数值研究[J]. 动力工程学报,2012,32(2):89-95. SUN Jun-wei,YAN Wei-ping,ZHAO Wen-juan,et al.Numerical study on biomass gas reburning in a 600 MW supercritical coal-fired boiler[J]. Journal of Chinese Society of Power Engineering,2012,32(2):89-95.
[21] 刘春元,罗永浩,张睿智,等.生物质气化气还原NO的化学反应动力学机制及数值模拟[J]. 中国电机工程学报,2011,31(5):120-124. LIU Chun-yuan,LUO Yong-hao,ZHANG Rui-zhi,et al.Chemical kinetic mechanism and numerical simulation on NO reduction by biomass gasification gas[J]. Proceedings of the CSEE,2011,31(5):120-124.
[22] 张睿智,段佳,刘春元,等.焦油对生物质气化再燃还原NO的影响[J]. 燃烧科学与技术,2010,16(01):18-22. ZHANG Rui-zhi,DUAN Jia,LIU Chun-yuan,et al.Effect of tar on NO reduction by biomass gasification syngas reburning[J]. Journal of Combustion and Technology,2010,16(01):18-22.
[23] 王健行,阎维平,何东.空气预热器结合一次风加热凝结水的排烟余热利用系统节能分析[J].热力发电,2017,46(10):10-15.WANG Jian-hang,YAN Wei-ping,HE Dong. Energy conservation analysis for waste heat utilization system applying air preheater and using primary air to heat condensate water[J].Thermal Power Generation,2017,46(10):10-15.
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