燃煤烟气多污染物协同治理试验研究
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摘要
为实现燃煤烟气污染物的深度脱除,在1 000 MW电站燃煤锅炉除尘器入口加装了多功能烟气污染物治理中试装置,并研究了该烟气治理装置对烟气中烟尘、SO_3和Hg等污染物吸附转化特性的影响。结果表明:该装置可以有效解决常规技术无法解决的PM_(2.5)、SO_3和Hg等排放问题。试验工况条件下,烟尘、PM_(10)、PM_(2.5)及PM1的脱除效果非常明显,脱除效率均高于99.3%(<5 mg/m~3,dry normal);当氢氧化钙为吸附剂、Ca/SO_3为1时,SO_3的脱除效果为88.78%(0.77 mg/m~3,dry normal)、Hg的脱除效率为94.272%,其中气态汞的脱除效率为75.883%。
In order to reach deep removal of flue gas pollutants,a multi-function gas pollution control system was installed at the inlet of dust collector of a 1 000 MW scale power plant coal fired boiler.The influence of multi-function gas pollution control system on adsorption and transformation properties of the pollutional dust,SO_3 and Hg in flue gas were studied.The results show that the device can effectively solve the emission problems which can not be solved by conventional technologies,such as PM_(2.5),SO_3 and Hg.The removal efficiencies of dust,PM_(10),PM_(2.5) and PM_1 are remarkably under the experimental conditions,and their removal efficiencies are higher than 99. 3%( < 5 mg/m~3,dry normal).When calcium hydroxide is chosen as the adsorbent with a Ca/S ratio of 1,the removal efficiency of SO_3 is 88. 78%( 0. 77 mg/m~3,dry normal),and the removal efficiencies of total Hg and gaseous Hg are 94. 272% and 75. 883%,respectively.
In order to reach deep removal of flue gas pollutants,a multi-function gas pollution control system was installed at the inlet of dust collector of a 1 000 MW scale power plant coal fired boiler.The influence of multi-function gas pollution control system on adsorption and transformation properties of the pollutional dust,SO_3 and Hg in flue gas were studied.The results show that the device can effectively solve the emission problems which can not be solved by conventional technologies,such as PM_(2.5),SO_3 and Hg.The removal efficiencies of dust,PM_(10),PM_(2.5) and PM_1 are remarkably under the experimental conditions,and their removal efficiencies are higher than 99. 3%( < 5 mg/m~3,dry normal).When calcium hydroxide is chosen as the adsorbent with a Ca/S ratio of 1,the removal efficiency of SO_3 is 88. 78%( 0. 77 mg/m~3,dry normal),and the removal efficiencies of total Hg and gaseous Hg are 94. 272% and 75. 883%,respectively.
引文
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[3]MA Qiang,WANG Zhihua,LIN Fawei.Characteristics of O3oxidation for simultaneous desulfurization and denitration with limestone-gypsum wet scrubbing:Application in a carbon black drying kiln furnace[J].Energy&Fuels,2016,30(3):2302-2308.
[4]常景彩,董勇,王志强.燃煤烟气中SO3转换吸收特性模拟实验[J].煤炭学报,2010,35(10):1717-1720.CHANG Jingcai,DONG Yong,WANG Zhiqiang,et al.Simulation experiment of SO3conversion and absorption characteristics in coal fired flue gas[J].Journal of China Coal Society,2010,35(10):1717-1720.
[5]BI Degui,ZHANG Jian,ZHANG Zhongxiao,et al.Industrial trials of high-temperature selective noncatalytic reduction injected in the primary combustion zone in a 50 MWe tangentially firing pulverized-coal boiler for deeper NOxreduction[J].Energy Fuels,2016,30(12):10858-10867.
[6]AHN S Y,GO S M,LEE K Y,et al.The characteristics of NO production mechanism on flue gas recirculation in oxy-firing condition[J].Applied Thermal Engineering,2011,31(6/7):1163-1171.
[7]ZHOU Dong,LUO Zhongyang,JIANG Jianping,et al.Experimental study on improving the efficiency of dust removers by using acoustic agglomeration as pretreatment[J].Powder Technology,2016,289:52-59.
[8]付振华,张忠孝,毕德贵,等.富燃料区喷氨降低烟煤NOx排放的试验研究[J].锅炉技术,2018,49(2):32-37.FU Zhenhua,ZHANG Zhongxiao,BI Degui,et al.Experimental research for reducing NOxemission of bituminous coal with reagent rejection in fuel-rich zone[J].Boiler Technology,2018,49(2):32-37.
[9]张忠梅,盛洪产,林孝鑫,等.KMn O4氧化复合Na OH液相吸收同时脱硫脱硝的实验研究[J].环境工程,2017,35(8):102-107.ZHANG Zhongmei,SHENG Hongchan,LIN Xiaoxin,et al.Experimental study on simultaneous desulfurization and denitrification by KMn O4oxidation combining Na OH liquid absorption[J].Environmental Engineering,2017,35(8):102-107.
[10]吴华成.燃煤火电厂烟气污染物排放对大气PM2.5的影响[J].华北电力技术,2014(5):1-4.WU Huacheng.Influence of flue gas emission of coal-fired power plant on atmospheric PM2.5[J].North China Electric Power,2014(5):1-4.
[11]王宏亮,薛建明,许月阳,等.燃煤电站锅炉烟气中SO3的生成及控制[J].电力科技与环保,2014,30(5):17-20.WANG Hongliang,XUE Jianming,XU Yueyang,et al.Formation and control of SO3from coal-fired power plants[J].Electric Power Technology and Environmental Protection,2014,30(5):17-20.
[12]王运军,段钰锋,杨立国,等.600 MW燃煤电站烟气汞形态转化影响因素分析[J].热能动力工程,2008,23(4):399-403.WANG Yunjun,DUAN Yufeng,YANG Liguo,et al.An analysis of the factors exercising an influence on the morphological transformation of mercury in the flue gas of a 600 MW coal-fired power plant[J].Journal of Engineering for Thermal Energy&Power,2008,23(4):399-403.
[13]张晓鲁.燃煤电站烟气污染物深度脱除技术的分析[J].中国工程科学,2014,16(10):47-51.ZHANG Xiaolu.Analysis of flue gas pollutants deep removal technology for coal-fired power plant[J].Strategic Study of CAE,2014,16(10):47-51.
[14]胡冬,王海刚,郭婷婷,等.燃煤电厂烟气SO3控制技术的研究及进展[J].科学技术与工程,2015,15(35):92-99.HU Dong,WANG Haigang,GUO Tingting,et al.Research and development of mitigating technology of SO3in flue gas from coal power plants[J].Science Technology and Engineering,2015,15(35):92-99.
[15]杨建平,赵永椿,张军营,等.燃煤电站飞灰对汞的氧化和捕获的研究进展[J].动力工程学报,2014,34(5):337-345.YANG Jianping,ZHAO Yongchun,ZHANG Junying,et al.Research process on mercury oxidation and capture with fly ash of coal-fired power plant[J].Journal of Chinese Society of Power Engineering,2014,34(5):337-345.