沿面放电等离子体氧化单质汞的影响因素
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摘要
利用沿面放电等离子体反应器氧化烟气中单质汞,考察了放电长度、弹簧螺距、高压电极线径、汞初始浓度、烟气温度以及喷射体系与湿法脱硫系统联合等因素对单质汞氧化的影响。结果表明:能量密度为3.9 J/L,放电长度为200 mm,弹簧螺距为6 mm,线径为1 mm,单质汞初始浓度为100μg/m~3,烟气温度为110℃,能够实现单质汞91.3%的氧化率。增大放电长度和高压电极线径能够促进单质汞的氧化;高浓度单质汞和升高烟气温度不利于单质汞的氧化;联合活性物质喷射与钙基湿法脱硫系统可以实现烟气中汞的有效脱除。
In the study, surface non-thermal discharge plasma was proposed to oxidize Hg~0 in coal-fired flue gas, and the influence factors including the discharge length, the screw pitch, the spring wire diameter, initial Hg~0 concentration, flue gas temperature and wet calcium FGD were studied. The results show that when the energy density is 3.9 J/L, the discharge length is 200 mm, the spring pitch is 6 mm, the wire diameter is 1 mm, the initial concentration of elemental mercury is 100 μg/m~3, and the flue gas temperature is 110 °C, the oxidation rate of elemental mercury can achieve 91.3%. Increasing discharge length, screw pitch and the spring diameter was favorable for oxidizing Hg~0. Higher initial concentration resulted in lower Hg~0 oxidation efficiency. Increasing flue gas temperature reduced the Hg~0 oxidation. The combination of the active species injection and wet calcium FGD was helpful for Hg removal.
In the study, surface non-thermal discharge plasma was proposed to oxidize Hg~0 in coal-fired flue gas, and the influence factors including the discharge length, the screw pitch, the spring wire diameter, initial Hg~0 concentration, flue gas temperature and wet calcium FGD were studied. The results show that when the energy density is 3.9 J/L, the discharge length is 200 mm, the spring pitch is 6 mm, the wire diameter is 1 mm, the initial concentration of elemental mercury is 100 μg/m~3, and the flue gas temperature is 110 °C, the oxidation rate of elemental mercury can achieve 91.3%. Increasing discharge length, screw pitch and the spring diameter was favorable for oxidizing Hg~0. Higher initial concentration resulted in lower Hg~0 oxidation efficiency. Increasing flue gas temperature reduced the Hg~0 oxidation. The combination of the active species injection and wet calcium FGD was helpful for Hg removal.
引文
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[15]AN J T,SHANG K F,LU N,et al.Performance evaluation of non-thermal plasma injection for elemental mercury oxidation in simulated flue gas[J].J Hazard Mater,2014,268:237-245.
[16]JIANG N,HU J,LI J,et al.Plasma-catalytic degradation of benzene over Ag-Ce bimetallic oxide catalysts using hybrid surface/packed-bed discharge plasmas[J].Applied Catalysis B:Environmental,2016,184:355-363.
[2]LINAK W P,JOL W.Toxic metal emissions from incineration:Mechanisms and control [J].Progress in Energy and Combustion Science,1993,19(2):145-155.
[3]GAO Y S,ZHANG Z,WU J W,et al.A critical review on the heterogeneous catalytic oxidation of elemental mercury in flue gases [J].Environ Sci Technol,2013,47(19):10813-10823.
[4]BROWN T D,SMITH D N,HARGIS J R,et al.Mercury measurement and its control:What we know,have learned,and need to further investigate [J].J.Air Waste Manag Assoc,1999,49(6):1-97.
[5]JIANG G B,SHI J B,FENG X B.Mercury pollution in China [J].Environ Sci Technol,2006,40(12):3672-3678.
[6]任建莉,周劲松,骆仲泱,等.新型吸附剂脱除烟气中气态汞的试验研究[J].中国电机工程学报,2007,27(2):49-53.
[7]XIE Y,LI C T,ZHAO L K,et al.Experimental study on Hg0 removal from flue gas over columnar MnOx-CeO2/activated coke [J].Applied Surface Science,2015,33:59-67.
[8]周亦骁,方志,邵涛.Ar/O2 和 Ar/H2O 中大气压等离子体射 流放 电特 性的 比较 [J].电工技术学报,2014,29(11):229-238.
[9]WANG R X,SUN H,ZHU W D,et al.Uniformity optimization and dynamic studies of plasma jet array interaction in argon [J].Physics of Plasmas,2017,24:093507.
[10]WANG T C,QU G Z,REN J Y,et al.Evaluation of the potentials of humic acid removal in water by gas phase surface discharge plasma[J].Water Research,2016,89:28-38.
[11]李杰,赵先军,商克峰,等.沿面放电生成臭氧的传输损耗研究 [J].高电压技术,2016(2):349-353.
[12]JIANG N,LU N,LI J,et al.Degradation of benzene by using a silent-packed bed hybrid discharge plasma reactor [J].Plasma science and technology,2012,14(1):140-147.
[13]WANG M Y,ZHU T L,LUO H J,et al.Effects of reaction conditions on elemental mercury oxidation in simulated flue gas by DC non-thermal plasma [J].Ind Eng Chem Res,2011,50(10):5914-5919.
[14]KO K B,BYUN Y,CHO M,et al.Influence of HCl on oxidation of gaseous elemental mercury by dielectric barrier discharge process[J].Chemosphere,2008,71(9):1674-1682.
[15]AN J T,SHANG K F,LU N,et al.Performance evaluation of non-thermal plasma injection for elemental mercury oxidation in simulated flue gas[J].J Hazard Mater,2014,268:237-245.
[16]JIANG N,HU J,LI J,et al.Plasma-catalytic degradation of benzene over Ag-Ce bimetallic oxide catalysts using hybrid surface/packed-bed discharge plasmas[J].Applied Catalysis B:Environmental,2016,184:355-363.
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