燃煤机组SO_3迁移规律及排放特性试验
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摘要
针对燃煤电厂SO_3排放现状,对国内多个典型燃煤机组(包括达标排放机组和超低排放机组)各污染物控制设备前后的SO_3质量浓度进行现场测试,并分析了国内典型燃煤机组的SO_3迁移规律。结果表明:达标排放机组的SO_3排放质量浓度普遍高于5 mg/m~3,而超低排放机组的SO_3排放质量浓度大多低于5 mg/m~3;燃煤机组SO_3迁移规律为烟气经选择性催化还原(SCR)脱硝装置后SO_3质量浓度明显增加,而经后续的电除尘装置、脱硫装置、低低温电除尘装置及湿电除尘装置后SO_3均得到有效脱除。
Against the current situation of SO_3 emission from coal-fired power plants, the mass concentration SO_3 in front and behind each pollutant control equipment of several domestic typical coal-fired units, including the ultra low emissions units and the units of which the emission satisfies the standard's requirement(short for discharge units), was tested in site. The results show that, the mass concentration of SO_3 emitted from most of the discharge units is higher than 5 mg/m~3, and that from a majority ultra low emission units is below 5 mg/m~3. Moreover, the migration of SO_3 in flue gas can be described as follows: after the flue gas flows through the SCR denitration equipment, the SO_3's mass concentration increases, it can be effectively removed by the subsequent ESP equipment, desulfuration equipment, low temperature ESP device and WESP device.
Against the current situation of SO_3 emission from coal-fired power plants, the mass concentration SO_3 in front and behind each pollutant control equipment of several domestic typical coal-fired units, including the ultra low emissions units and the units of which the emission satisfies the standard's requirement(short for discharge units), was tested in site. The results show that, the mass concentration of SO_3 emitted from most of the discharge units is higher than 5 mg/m~3, and that from a majority ultra low emission units is below 5 mg/m~3. Moreover, the migration of SO_3 in flue gas can be described as follows: after the flue gas flows through the SCR denitration equipment, the SO_3's mass concentration increases, it can be effectively removed by the subsequent ESP equipment, desulfuration equipment, low temperature ESP device and WESP device.
引文
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[2]姚燕,王丽丽,孙凡海,等.SCR脱硝系统蜂窝式催化剂性能评估及寿命管理[J].热力发电,2016,45(11):114-119.YAO Yan,WANG Lili,SUN Fanhai,et al.Performance evaluation and lifetime management of honeycomb SCRcatalyst in coal-fired plant[J].Thermal Power Generation,2016,45(11):114-119.
[3]谢天,李杨,周元祥,等.一种基于烟气中SO2浓度计算锅炉烟气酸露点的方法[J].热力发电,2013,42(12):118-134.XIE Tian,LI Yang,ZHOU Yuanxiang,et al.A SO2concentration based calculation method for acid dew point of flue gas[J].Thermal Power Generation,2013,42(12):118-134.
[4]陆军,刘永强,周飞,等.高硫煤机组低低温省煤器SO3协同脱除试验研究[J].热力发电,2016,45(12):30-37.LU Jun,LIU Yongqiang,ZHOU Fei,et al.Experimental research on simultaneous removal of SO3 by low-low temperature economizer in units firing high-sulfur coal[J].Thermal Power Generation,2016,45(12):30-37.
[5]程宏鸽,程雪山,马彦斌,等.燃煤烟气中SO3的产生与转化及其抑制对策探讨[J].发电与空调,2012(2):1-4.CHENG Hongge,CHENG Xueshan,MA Yanbin,et al.Some discussion about SO3’s generation,transformation and its inhibiting methods in coal-fired flue gas[J].Power Generation&Air Condition,2012(2):1-4.
[6]HUANG R J,ZHANG Y,BOZZETTI C,et al.High secondary aerosol contribution to particulate pollution during haze events in China[J].Nature,2014,514(7521):218-222.
[7]上海环境保护局,上海标准化管理委员会.大气污染物综合排放标准:DB 31/933-2015[S].上海:上海标准出版社,2015.Shanghai Standardization Management Committee,Shanghai Environmental Protection Bureau.Integrate emission standards of air pollutants:DB 31/933-2015[S].Shanghai:Standards Press of China,2015.
[8]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.燃煤烟气脱硫设备性能测试方法:GB/T 21508-2008[S].北京:中国标准出版社,2008.General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,Standardization Administration of the People's Republic of China.Performance test method for coal-fired flue gas desulphurization equipment:GB/T 21508-2008[S].Beijing:Standards Press of China,2008.
[9]国家能源局.石灰石-石膏湿法烟气脱硫装置性能验收试验规范:DL/T 998-2016[S].2016.National Energy Administration.Performance test code for wet limestone gypsum flue gas desulphurization:DL/T998-2016[S].2016.
[10]环境保护部,国家质量监督检验检疫总局.火电厂大气污染物排放标准:GB 13223-2011[S].北京:中国环境科学出版社,2011.Ministry of Environmental Protection,State Administration of Quality Supervision,Inspection and Quarantine.Emission standard of air pollutants for thermal power plants:GB 13223-2011[S].Beijing:China Environmental Press,2011.
[11]SVACHULA J,ALEMANY L J,FERLAZZO N.et al.Oxidation of sulfur dioxide to sulfur trioxide over honeycomb deNOxing catalysts[J].Industrial&Engineering Chemistry Research,1993,32:828-834.
[12]SCHW?MMLE T,BERTSCHE F,HARTUNG A.Influence of geometrical parameters of honeycomb commercial SCR-deNOx-catalysts on deNOx-activity,mercury oxidation and SO2/SO3-conversion[J].Chemical Engineering Journal,2013,222(15):274-281.
[13]史伟伟.SCR脱硝催化剂再生浸渍及其SO2氧化控制[D].广州:华南理工大学,2013:35.SHI Weiwei.Impregnation regeneration and SO2 oxidation control of the SCR denitration catalysts[D].Guangzhou:South China University of Technology,2013:35.
[14]纪培栋.SCR催化剂SO2氧化机理及调控机制研究[D].杭州:浙江大学,2016:29.JI Peidong.Research of SO2 oxidation over SCR catalyst and regulatory mechanism[D].Hangzhou:Zhejiang University,2016:29.
[15]HARDMAN R,STACY R,DISMUKES E.Estimating sulfuric acid aerosol emissions from coal-fired power plants[R].Washington:US Department of Energy-FETC,1998:1-11.
[16]KISHI T,TKAGI M,INABA T,et al.Prediction of deactivation and regeneration of de NOx catalyst using simple reaction model-2nd report:Modeling for predicting catalyst regeneration and its application[J].Journal of the Marine Engineering Society in Japan,2011,46(1):115-120.
[17]DENE C,HIMES R.Continuous measurement technologies for SO3 and H2SO4 in coal-fired power plants[R].California,EPRI,2004:1-84.
[18]刘宏丽,靳智平,卫国,等.1 025 t/h循环流化床锅炉深度脱硫方式选择研究[J].热力发电,2009,38(3):5-9.LIU Hongli,JIN Zhiping,WEI Guo,et al.Study on selecting deep desulphurization mode for 1 025 t/h CFBboiler[J].Thermal Power Generation.2009,38(3):5-9.
[19]张绪辉.低低温电除尘器对细颗粒物及三氧化硫的协同脱除研究[D].北京:清华大学,2015:30.ZHANG Xuhui.Studies on synergetic removal of fine particulates and SO3 by an extra cold-side electrostatic precipitator[D].Beijing:Tsinghua University,2015:30.
[20]熊丹柳,邓修.液膜法烟气脱硫试验研究:Ⅱ.促进传递机理与数学模型[J].华东理工大学学报:自然科学版,1998(1):1-6.XIONG Danliu,DENG Xiu.A study of flue gas desulfurization by contained liquid membrane method II.Transport mechanism and mathematical model[J].Journal of East China University of Science and Technology:Natural Science Edition,1998(1):1-6.