干法碳酸氢钠脱硫过程及影响因素分析
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摘要
通过固定床反应装置模拟了NaHCO_3粉末与SO_2反应,考察了NaHCO_3粒径和反应温度对脱硫过程的影响,设计了经热解处理后的NaHCO_3与SO_2反应,推导出NaHCO_3热激活脱硫机制。研究发现:150～360℃内,温度越高SO_2脱除率越高; NaHCO_3粒径越小脱硫效果越好;当NaHCO_3粒径为1500目、反应温度为360℃时,SO_2脱除率高达99. 1%。反应温度为240～390℃时,脱硫反应可分为2个阶段:第1阶段主要为SO_2在NaHCO_3颗粒表面与之直接反应;第2阶段为高温下NaHCO_3分解生成Na_2CO_3和CO_2,CO_2从体相逸出后可提供大量微孔结构,有利于提高反应比表面积和反应速率。
In this paper,a fixed bed reactor was applied to simulate the reaction between NaHCO_3 and SO_2,the effect of reaction temperature and particle size of sodium bicarbonate on desulfurization process was investigated,the reaction between thermally activated NaHCO_3 and SO_2 was designed,and the mechanism of desulphurization by NaHCO_3 was deduced. It was found that: in the range of 150 ～ 360 ℃,the higher the temperature and the smaller the particle size of NaHCO_3 were,the higher the SO_2 removal rate was,when the particle size of sodium bicarbonate was 1500 meshes and the reaction temperature was 360 ℃,the removal rate of sulfur dioxide was up to 99. 1%; when the reaction temperature was 240 ～ 390 ℃,the desulfurization process could be divided into two stages: in the first stage,SO_2 was involved in a direct reaction with NaHCO_3 on the surface of NaHCO_3 particles,and in the second stage,NaHCO_3 was decomposed into Na_2CO_3 and CO_2 under high temperature,and the generated CO_2 could provide plenty of cellular structures after its escaping from bulk phase,which was favorable for improving the reaction ratio surface and the reaction rate.
In this paper,a fixed bed reactor was applied to simulate the reaction between NaHCO_3 and SO_2,the effect of reaction temperature and particle size of sodium bicarbonate on desulfurization process was investigated,the reaction between thermally activated NaHCO_3 and SO_2 was designed,and the mechanism of desulphurization by NaHCO_3 was deduced. It was found that: in the range of 150 ～ 360 ℃,the higher the temperature and the smaller the particle size of NaHCO_3 were,the higher the SO_2 removal rate was,when the particle size of sodium bicarbonate was 1500 meshes and the reaction temperature was 360 ℃,the removal rate of sulfur dioxide was up to 99. 1%; when the reaction temperature was 240 ～ 390 ℃,the desulfurization process could be divided into two stages: in the first stage,SO_2 was involved in a direct reaction with NaHCO_3 on the surface of NaHCO_3 particles,and in the second stage,NaHCO_3 was decomposed into Na_2CO_3 and CO_2 under high temperature,and the generated CO_2 could provide plenty of cellular structures after its escaping from bulk phase,which was favorable for improving the reaction ratio surface and the reaction rate.
引文
[1] Ma J Z,Xu X B,Zhao C S,et al. A review of atmospheric chemistry research in China:photochemical smog,haze pollution,and gas-aerosol interactions[J]. Advances in Atmospheric Sciences,2012,29(5):1006-1026.
[2]亚洲清洁空气中心.大气中国2016:中国大气污染防治进程[R/OL]. http://www. cleanairasia. cn/a/item/kq/kq3/dt/2018/0323/161.html,2016.
[3]张辉,贾思宁,范菁菁.燃气与燃煤电厂主要污染物排放估算分析[J].环境工程,2012,30(3):59-62,30.
[4] 2015年全国环境统计公报[R/OL].[2017-02-23].http://www.mee. gov. cn/gzfw-1307/hjtj/qqhjtjgb/201702/t20170233_397419.shtml.
[5]张秀云,郑继成.国内外烟气脱硫技术综述[J].电站系统工程,2010,26(4):1-2.
[6]李喜,李俊.烟气脱硫技术研究进展[J].化学工业与工程,2006,23(4):351-354.
[7]杨黎辉,湿法烟气脱硫技术现状[J].当代化工研究,2017,11:104-105.
[8]任丹丹,冯罗澍,陈颖.大型燃煤电厂脱硫废水烟气利用技术研究[J].浙江电力,2018,37(3):82-85.
[9]薛军,杨东,陈玉乐,等.烟气海水脱硫技术的研发与应用[J].电力科技与环保,2010(1):36-38.
[10]李盼宋,李建军,贺尧祖,等.电子束氨法协同脱硫脱硝技术的研究进展[J].四川化工,2016,19(1):7-9.
[11]李鹏飞,朱晓华,李睿,等.烟气脱硫脱硝流化床反应器入口导流板的数值模拟与优化[J].环境工程,2017,35(8):76-80.
[12] Dahlan I,Lee K T,Kamaruddin A H,et al. Evaluation of various additives on the preparation of rice husk ash(RHA)/CaO-based sorbent for flue gas desulfurization(FGD)at low temperature[J].Journal of Hazardous Materials,2009,161(1):570-574.
[13] Michael J P,James M W. Pilot scale SO2control by dry sodium bicarbonate injection and an electrostatic precipitator[J].Environmental Progress,2007,26(3):263-270.
[14] Wu C F,Khang S J,Keener T C,et al. A model for dry sodium bicarbonate duct injection flue gas desulfurization[J]. Advances in Environmental Research,2004,8(3/4):655-666.
[15] Rudi H K. Basic features of the dry absorption process for flue gas treatment systems in waste incineration[Z]. Energy Environmental Engineering and Consulting Firm,Germany,2015.
[16] Keener T C,Khang S J. Kinetics of the sodium bicarbonate-sulfur dioxide reaction[J]. Chemical Engineering Science,1993,48(16):2859-2865.
[2]亚洲清洁空气中心.大气中国2016:中国大气污染防治进程[R/OL]. http://www. cleanairasia. cn/a/item/kq/kq3/dt/2018/0323/161.html,2016.
[3]张辉,贾思宁,范菁菁.燃气与燃煤电厂主要污染物排放估算分析[J].环境工程,2012,30(3):59-62,30.
[4] 2015年全国环境统计公报[R/OL].[2017-02-23].http://www.mee. gov. cn/gzfw-1307/hjtj/qqhjtjgb/201702/t20170233_397419.shtml.
[5]张秀云,郑继成.国内外烟气脱硫技术综述[J].电站系统工程,2010,26(4):1-2.
[6]李喜,李俊.烟气脱硫技术研究进展[J].化学工业与工程,2006,23(4):351-354.
[7]杨黎辉,湿法烟气脱硫技术现状[J].当代化工研究,2017,11:104-105.
[8]任丹丹,冯罗澍,陈颖.大型燃煤电厂脱硫废水烟气利用技术研究[J].浙江电力,2018,37(3):82-85.
[9]薛军,杨东,陈玉乐,等.烟气海水脱硫技术的研发与应用[J].电力科技与环保,2010(1):36-38.
[10]李盼宋,李建军,贺尧祖,等.电子束氨法协同脱硫脱硝技术的研究进展[J].四川化工,2016,19(1):7-9.
[11]李鹏飞,朱晓华,李睿,等.烟气脱硫脱硝流化床反应器入口导流板的数值模拟与优化[J].环境工程,2017,35(8):76-80.
[12] Dahlan I,Lee K T,Kamaruddin A H,et al. Evaluation of various additives on the preparation of rice husk ash(RHA)/CaO-based sorbent for flue gas desulfurization(FGD)at low temperature[J].Journal of Hazardous Materials,2009,161(1):570-574.
[13] Michael J P,James M W. Pilot scale SO2control by dry sodium bicarbonate injection and an electrostatic precipitator[J].Environmental Progress,2007,26(3):263-270.
[14] Wu C F,Khang S J,Keener T C,et al. A model for dry sodium bicarbonate duct injection flue gas desulfurization[J]. Advances in Environmental Research,2004,8(3/4):655-666.
[15] Rudi H K. Basic features of the dry absorption process for flue gas treatment systems in waste incineration[Z]. Energy Environmental Engineering and Consulting Firm,Germany,2015.
[16] Keener T C,Khang S J. Kinetics of the sodium bicarbonate-sulfur dioxide reaction[J]. Chemical Engineering Science,1993,48(16):2859-2865.