湿法烟气脱硫塔湍流提效装置的热态实验
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摘要
通过不同湍流装置对吸收塔的增效研究,提出了一种新型球式湍流提效结构。以装配有该新型湍流装置的热态吸收塔为研究对象,讨论气体流速(气速)、液气比(L/G)、浆液浓度及湍流装置纵横间距对其增效及阻力特性的影响。研究发现:相较于传统湍流增效装置,新型湍流装置可在较小压力下达到更高的脱硫效率,工业应用前景良好。并且增大气体流速或L/G,减小纵间距均可获得更大的脱硫效率,但压力随之增大。当进口烟气ρ(SO_2)为2000 mg/m~3,湍流层横纵间距为X_2∶Y_3,气速为3. 6 m/s,L/G为12 L/m~3,浆液浓度为10%时,脱硫效率最高,出口烟气SO_2浓度达到超低排放标准(≤35 mg/m~3)。
A new spherical turbulent structure was proposed by studying the efficiency enhancing effect of different turbulence devices on the absorption towers. With the absorption tower equipped with the new turbulence device being the study object,the influence of gas velocity,liquid/gas ratio( L/G),slurry concentration,and vertical and horizontal space of the turbulence device on efficiency enhancing effect and resistance characteristics was discussed. The study found that: the new turbulence device could achieve higher desulfurization efficiency under less pressure compared with the traditional turbulence efficiency enhancer,therefore,it had good prospects of industrial applications. For the new turbulence device,increasing the gas velocity or L/G,and reducing the vertical distance could obtain better desulfurization efficiency,while the pressure increased as well.When ρ( SO_2) of the inlet gas was 2000 mg/m~3,the transverse and longitudinal distance of the turbulent layer was X_2∶ Y_3,the gas velocity was 3. 6 m/s,L/G was 12 L/m~3,and the slurry concentration was 10%,the desulfurization efficiency reached a peak value,and the SO_2 concentration of the outlet gas met the ultra-low emission standards.
A new spherical turbulent structure was proposed by studying the efficiency enhancing effect of different turbulence devices on the absorption towers. With the absorption tower equipped with the new turbulence device being the study object,the influence of gas velocity,liquid/gas ratio( L/G),slurry concentration,and vertical and horizontal space of the turbulence device on efficiency enhancing effect and resistance characteristics was discussed. The study found that: the new turbulence device could achieve higher desulfurization efficiency under less pressure compared with the traditional turbulence efficiency enhancer,therefore,it had good prospects of industrial applications. For the new turbulence device,increasing the gas velocity or L/G,and reducing the vertical distance could obtain better desulfurization efficiency,while the pressure increased as well.When ρ( SO_2) of the inlet gas was 2000 mg/m~3,the transverse and longitudinal distance of the turbulent layer was X_2∶ Y_3,the gas velocity was 3. 6 m/s,L/G was 12 L/m~3,and the slurry concentration was 10%,the desulfurization efficiency reached a peak value,and the SO_2 concentration of the outlet gas met the ultra-low emission standards.
引文
[1]林永明.大型石灰石-石膏湿法喷淋脱硫技术研究及工程应用[D].杭州:浙江大学,2006.
[2]关于印发《煤电节能减排升级与改造行动计划(2014—2020年)》的通知(发改能源[2014]2093号)[EB/OL].[2018-04-26]. http://zfxxgk. ndrc. gov. cn/PublicItemView. aspx? Item ID=%7b3593e846-61a8-48b3-8e8e-fbf78e3a2828%7d.
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[4]郭军,江松,魏强.石灰石-石膏湿法烟气脱硫物料平衡模型研究[J].环境科学与技术,2014(增刊1):457-463.
[5] Valle-ZermenO R D,NiubóM,Formosa J,et al. Synergistic effect of the parameters affecting wet flue gas desulfurization using magnesium oxides by-products[J]. Chemical Engineering Journal,2015,262:268-277.
[6]程峰,高翔,骆仲泱,等.湍流式湿法烟气脱硫除尘技术的试验研究及工程应用[J].热力发电,2002,31(6):37-39,67.
[7]汪潇,杨留栓,朱新峰,等.湿法脱硫石膏颗粒特性与杂质赋存状况分析[J].环境科学与技术,2013,36(9):135-138.
[8]王惠挺,钟毅,高翔,等.湿法烟气脱硫筛板式喷淋塔阻力特性的试验研究[J].动力工程,2009,29(11):1047-1050.
[9]胡蔷.喷淋泡沫塔多相流数值模拟及优化[D].长沙:中南大学,2011.
[10]何杰.填料塔多种高效脱硫工艺的性能对比研究[D].天津:天津大学,2011.
[11]陈湘文.筛板式喷淋塔脱硫脱硝性能试验研究[D].杭州:浙江大学,2008.
[12]肖育军. PCF型湿式脱硫除尘器结构的CFD优化研究[D].长沙:湖南大学,2014.
[13]李珊红.新型伞形罩洗涤器的实验和数值模拟研究[D].长沙:湖南大学,2008.
[14]李兴华,牛拥军,雷鸣,等.火电机组脱硫系统超低排放改造节能优化[J].热力发电,2017,46(11):119-123.
[15]赵志锋,杜谦,董鹤鸣,等.湿法脱硫装置对燃煤锅炉PM2. 5排放特征的影响[J].化工学报,2017,68(11):4261-4271.
[16]赵艳翠.刍议煤矸石综合利用电厂的脱硫问题[J].应用能源技术,2018,24(1):19-21.
[17]邵雄飞.旋流板塔内两相流场的CFD模拟与分析[D].杭州:浙江大学,2004.
[18]闫娜.喷淋塔的冷态试验与数值模拟[D].北京:北京交通大学,2013.
[19] Altun N E. Assessment of marble waste utilization as an alternative sorbent to limestone for SO2control[J]. Fuel Processing Technology,2014,128:461-470.
[20]蒋惠梦,谷小兵,余苏玲,等.湿法烟气脱硫喷淋塔的阻力特性研究[J].环境保护科学,2017,53(3):85-90.
[21]蒋惠梦,余苏玲,肖述明,等.湿法烟气脱硫喷淋塔的持液特性[J].环境工程学报,2017,11(3):1746-1754.
[22]孔华,高翔,吕同波,等.湍流式湿法除尘脱硫装置试验研究及工业性应用[J].燃烧科学与技术,2001,7(4):261-263.
[23] Feng C, Gao X, Tang Y, et al. Comparative life cycle environmental assessment of flue gas desulphurization technologies in China[J]. Journal of Cleaner Production,2014,68:81-92.
[24]王惠挺.湿法烟气脱硫筛板式喷淋塔阻力特性的实验研究[C]∥中国动力工程学会第四届青年学会会议,北京,2009.
[25]陈湘文.湿法烟气脱硫筛板式喷淋塔阻力特性的实验研究[C]∥中国电机工程学会清洁高效燃煤发电技术协作网2010年会,宁波,2010.
[2]关于印发《煤电节能减排升级与改造行动计划(2014—2020年)》的通知(发改能源[2014]2093号)[EB/OL].[2018-04-26]. http://zfxxgk. ndrc. gov. cn/PublicItemView. aspx? Item ID=%7b3593e846-61a8-48b3-8e8e-fbf78e3a2828%7d.
[3] Chen Z,Wang H,Zhuo J,et al. Enhancement of mass transfer between flue gas and slurry in the wet flue gas desulfurization spray tower[J]. Energy&Fuels,2018,32(1):703-712.
[4]郭军,江松,魏强.石灰石-石膏湿法烟气脱硫物料平衡模型研究[J].环境科学与技术,2014(增刊1):457-463.
[5] Valle-ZermenO R D,NiubóM,Formosa J,et al. Synergistic effect of the parameters affecting wet flue gas desulfurization using magnesium oxides by-products[J]. Chemical Engineering Journal,2015,262:268-277.
[6]程峰,高翔,骆仲泱,等.湍流式湿法烟气脱硫除尘技术的试验研究及工程应用[J].热力发电,2002,31(6):37-39,67.
[7]汪潇,杨留栓,朱新峰,等.湿法脱硫石膏颗粒特性与杂质赋存状况分析[J].环境科学与技术,2013,36(9):135-138.
[8]王惠挺,钟毅,高翔,等.湿法烟气脱硫筛板式喷淋塔阻力特性的试验研究[J].动力工程,2009,29(11):1047-1050.
[9]胡蔷.喷淋泡沫塔多相流数值模拟及优化[D].长沙:中南大学,2011.
[10]何杰.填料塔多种高效脱硫工艺的性能对比研究[D].天津:天津大学,2011.
[11]陈湘文.筛板式喷淋塔脱硫脱硝性能试验研究[D].杭州:浙江大学,2008.
[12]肖育军. PCF型湿式脱硫除尘器结构的CFD优化研究[D].长沙:湖南大学,2014.
[13]李珊红.新型伞形罩洗涤器的实验和数值模拟研究[D].长沙:湖南大学,2008.
[14]李兴华,牛拥军,雷鸣,等.火电机组脱硫系统超低排放改造节能优化[J].热力发电,2017,46(11):119-123.
[15]赵志锋,杜谦,董鹤鸣,等.湿法脱硫装置对燃煤锅炉PM2. 5排放特征的影响[J].化工学报,2017,68(11):4261-4271.
[16]赵艳翠.刍议煤矸石综合利用电厂的脱硫问题[J].应用能源技术,2018,24(1):19-21.
[17]邵雄飞.旋流板塔内两相流场的CFD模拟与分析[D].杭州:浙江大学,2004.
[18]闫娜.喷淋塔的冷态试验与数值模拟[D].北京:北京交通大学,2013.
[19] Altun N E. Assessment of marble waste utilization as an alternative sorbent to limestone for SO2control[J]. Fuel Processing Technology,2014,128:461-470.
[20]蒋惠梦,谷小兵,余苏玲,等.湿法烟气脱硫喷淋塔的阻力特性研究[J].环境保护科学,2017,53(3):85-90.
[21]蒋惠梦,余苏玲,肖述明,等.湿法烟气脱硫喷淋塔的持液特性[J].环境工程学报,2017,11(3):1746-1754.
[22]孔华,高翔,吕同波,等.湍流式湿法除尘脱硫装置试验研究及工业性应用[J].燃烧科学与技术,2001,7(4):261-263.
[23] Feng C, Gao X, Tang Y, et al. Comparative life cycle environmental assessment of flue gas desulphurization technologies in China[J]. Journal of Cleaner Production,2014,68:81-92.
[24]王惠挺.湿法烟气脱硫筛板式喷淋塔阻力特性的实验研究[C]∥中国动力工程学会第四届青年学会会议,北京,2009.
[25]陈湘文.湿法烟气脱硫筛板式喷淋塔阻力特性的实验研究[C]∥中国电机工程学会清洁高效燃煤发电技术协作网2010年会,宁波,2010.