燃煤烟气SO_3测试捕集效率试验研究
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摘要
燃煤烟气中的SO_3浓度低、化学性质活泼,一直是国内燃煤电厂污染物测试的难点。针对"控制冷凝法"测试SO_3捕集效率低的问题,依托自制的SO_3校准发生装置进行试验研究。结果表明:通过采用D型蛇形管+硼硅玻璃纤维滤膜过滤装置,采样流量为20L/min以及精准控制采样管、过滤器、蛇形管和滤膜过滤装置的伴热温度,可以确保SO_3捕集效率达到90%以上,因而可保证烟气SO_3的捕集效率和测试结果的准确性。改进后的方法已在模拟试验(低尘、含湿、不同SO_3含量)中得到良好应用,进而可用于燃煤电厂烟气SO_3测量。
Because of the low concentration and active chemical properties, it has always been difficult to detect SO_3 in the coal burning flue gas for pollutant inspection domestically and abroad. Aiming at the problem of the low collection efficiency of SO_3 detection by control condensation method, the experiment was conducted based on the homegrown SO_3 calibration system. Study results show that: the collection efficiency can be effectively improved to over 90% through the application of the D-type condenser and filter membrane filter device with borosilicate glass fiber membrane, if the optimal sampling flow rate was kept at 20 L/min, and the heating temperature of sample tube, condenser pipe and filter was controlled precisely. Hence both the collection efficiency of SO_3 detection and the accuracy of test result are guaranteed. The enhanced control condensation method has been widely used in computer simulations under the conditions of low dust content with certain moisture and various concentrations of SO_3, and consequently can be implemented to examine the SO_3 concentration in fume for the entire coal-fired power industry.
Because of the low concentration and active chemical properties, it has always been difficult to detect SO_3 in the coal burning flue gas for pollutant inspection domestically and abroad. Aiming at the problem of the low collection efficiency of SO_3 detection by control condensation method, the experiment was conducted based on the homegrown SO_3 calibration system. Study results show that: the collection efficiency can be effectively improved to over 90% through the application of the D-type condenser and filter membrane filter device with borosilicate glass fiber membrane, if the optimal sampling flow rate was kept at 20 L/min, and the heating temperature of sample tube, condenser pipe and filter was controlled precisely. Hence both the collection efficiency of SO_3 detection and the accuracy of test result are guaranteed. The enhanced control condensation method has been widely used in computer simulations under the conditions of low dust content with certain moisture and various concentrations of SO_3, and consequently can be implemented to examine the SO_3 concentration in fume for the entire coal-fired power industry.
引文
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[19]MADDALONE R,GAMER N.Process measurement procedures H2SO4 emissions[R].Wsahington:Environmental Protection Agency,1979:1-31.
[20]罗毅,陈威祥.高湿低温环境下低浓度颗粒物采集滤膜试验研究[J].中国电力,2018,51(8):180-184.LUO Yi,CHEN Weixiang.Experimental study on sampling filter membrane for low concentration particulate matter under highhumidity low-temperature environment[J].Electric Power,2018,51(8):180-184.
[21]YANG Ding,ZHENG Fang.Detection technique of SO3 content in coal-fired flue gas and accuracy analysis[C]//The 8th International Symposium on Coal Combustion.Beijing,2015:563-566.
[22]郭俊,杨丁,叶兴联,等.用于标定低浓度颗粒物测试方法准确性的烟气发生系统:201721869892.4[P].2017-12-27.
[2]李彦,武彬,徐旭常.SO2、SO3和H2O对烟气露点温度影响的研究[J].环境科学学报,1997,17(1):126-130.LI Yan,WU Bin,XU Xuchang.Effect of SO2,SO3 and H2O on dew point of flue gas[J].Acta Scientiae Circumstantiae,1997,17(1):126-130.
[3]崔娟玲,郭昭胜.150 m高钢筋混凝土烟囱及烟道腐蚀检测及分析[J].中国电力,2015,48(5):7-11.CUI Juanling,GUO Zhaosheng.Inspection and analysis of the corrosion of 150-meter super high reinforced concrete chimney and flue[J].Electric Power,2015,48(5):7-11.
[4]SRIVASTAVA R K,MILLER C A,ERICKSON C,et al.Emissions of sulfur trioxide from coal-fired power plants[J].Journal of the Air&Waste Management Association,2004,54(6):750-762.
[5]吴宁,宋蔷,李水清,等.SCR烟气脱硝过程中SO2和SO3的测量[J].煤炭转化,2006,29(2):84-87.WU Ning,SONG Qiang,LI Shuiqing,et al.Measurement of SO2 and SO3 in SCR flue gas denitrification[J].Coal Conversion,2006,29(2):84-87.
[6]EPA.Determination of sulfuric acid mist and sulfur dioxide emissions from stationary sources:EPA-Method 8-2017[S].2017.
[7]肖雨亭,贾曼,徐莉,等.烟气中三氧化硫及硫酸雾滴的分析方法[J].环境科技,2012,25(5):43-48.XIAO Yuting,JIA Man,XU Li,et al.The analytic method of sulfur trioxide and sulfuric acid mist in flue gas[J].Environmental Science and Technology,2012,25(5):43-48.
[8]杨丁,陈永强,陈威祥,等.SO3采样技术改进及烟气处理设备SO3脱除能力测试[J].中国电力,2018,51(7):157-161.YANG Ding,CHEN Yongqiang,CHEN Weixiang,et al.Improvement of SO3 sampling technology and SO3 removal capability testing of flue gas treatment equipment[J].Electric Power,2018,51(7):157-161.
[9]陈永强,陈威祥,郑芳,等.燃煤烟气SO3采样分析与应用研究[C]//第17届中国电除尘学术会议论文集.合肥,2017:652-655.
[10]RONL O,MATTHEW S D.Controlled condensation method for flue gas SO3 measurement[EB/OL].(2011-12-16)[2017-01-08].http://www.metl.doe.gov/publications/proceedings/98/98fg/oda.pdf.
[11]张悠.烟气中SO3测试技术及其应用研究[D].杭州:浙江大学,2013.
[12]杨丁,陈威祥,郑芳,等.一种三氧化硫采样测试系统的校验方法和装置:20141 0401789.1[P].2014-08-14.
[13]陈威祥,杨丁,陈永强,等.一种烟气三氧化硫采样装置:201420579623.4[P].2014-10-08.
[14]WILLIAM E F,PETER M W,JOHN P G,et al.Identification of(and responses to)potential effects of SCR and wet scrubbers on submicron particulate emissions and plume characteristics[R].Alabama:Environmental Protection Agency,2004:1-81.
[15]ISO.Air quality;Determination of mass concentration of sulphur dioxide in ambient air;Thorin spectrophotometric method:ISO 4221-1980[S].1980.
[16]ISO.Stationary source emissions-Determination of the mass concentration of sulphur dioxide-Hydrogen peroxide/barium perchlorate/Thorin method:ISO 7934-1989[S].1989.
[17]BS.Stationary source emissions-Section 4.1 Method for the determination of the mass concentration of sulphur dioxide:Hydrogen peroxide/barium perchlorate/Thorin method:BS 6069-4.1-1990[S].1990.
[18]国家环境保护总局.水质硫酸盐的测定铬酸钡分光光度法(试行):HJ/T342-2007[S].北京:中国环境科学出版社,2007.
[19]MADDALONE R,GAMER N.Process measurement procedures H2SO4 emissions[R].Wsahington:Environmental Protection Agency,1979:1-31.
[20]罗毅,陈威祥.高湿低温环境下低浓度颗粒物采集滤膜试验研究[J].中国电力,2018,51(8):180-184.LUO Yi,CHEN Weixiang.Experimental study on sampling filter membrane for low concentration particulate matter under highhumidity low-temperature environment[J].Electric Power,2018,51(8):180-184.
[21]YANG Ding,ZHENG Fang.Detection technique of SO3 content in coal-fired flue gas and accuracy analysis[C]//The 8th International Symposium on Coal Combustion.Beijing,2015:563-566.
[22]郭俊,杨丁,叶兴联,等.用于标定低浓度颗粒物测试方法准确性的烟气发生系统:201721869892.4[P].2017-12-27.