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类型 应用研究 预答辩日期 2017-09-17
开始(开题)日期 2012-11-16 论文结束日期 2017-06-23
地点 热能所一楼会议室 论文选题来源 973、863项目     论文字数 9.2 (万字)
题目 应用化学团增强细颗粒物脱除的试验研究
主题词 PM2.5,化学团聚,脱硫废水蒸发处理,电除尘,湿法脱硫
摘要 雾霾污染已成为我国突出的大气环境问题,燃煤PM2.5排放是造成雾霾天气的重要原因。由于PM2.5具有比表面积大,易富集有毒有害物质,且常规除尘技术对其难以有效脱除等特点,增强现有污染物控制设施对PM2.5的脱除,已成为当前能源与环境领域研究的热点。其中,利用化学团聚类技术耦合现有污染控制设施是促进PM2.5脱除的有效措施之一。本文结合电除尘和湿法脱硫系统,开展了应用烟气调质、化学团聚促进烟气中细颗粒物脱除的研究。 试验考察了增湿调质对粉尘特性的影响及其对电除尘脱除细颗粒物的促进效果,并研究了低低温电除尘对污染物的协同脱除效果及其与增湿调质耦合促进污染物脱除的功效。结果表明,增湿调质可提高电除尘对细颗粒物的脱除效果,且脱除效果随细颗粒浓度的增加而上升;在相同电除尘入口烟温下,增湿量越大,增湿调质效果越好。低低温烟气环境下,SO3凝结成硫酸雾滴附着在燃煤飞灰上,使得细颗粒物团聚性能增加;增湿调质协同低低温电除尘器可促进SO3和细颗粒物的脱除。 采用燃煤热态试验系统,考察了化学团聚剂添加前后细颗粒物性的变化、典型工况下的化学团聚增强电除尘促进细颗粒脱除的效果,并进行了团聚剂筛选及影响因素试验研究。结果表明,电除尘前喷入化学团聚剂后,细颗粒物数量浓度峰值粒径由0.15μm增至0.4 μm,添加润湿剂后峰值粒径继续长大。典型工况下,化学团聚可使电除尘对细颗粒物的脱除效率提高40%以上。由于分子链长、有效基团多,有机团聚剂化学团聚效果优于无机团聚剂;通过组合不同团聚剂,并添加润湿剂和降比电阻剂,可增进化学团聚效果。化学团聚效果随团聚剂浓度增加而升高,pH值影响高分子链中有效基团的赋存形态导致化学团聚效果发生改变;烟温过高影响团聚剂性能,烟温过低不利液滴蒸发,适宜烟温范围为140 ~ 160 ℃;电除尘电压升高,团聚促进效果提升。 在此基础上,开展了采用脱硫废水配制化学团聚剂溶液以协同增强细颗粒物脱除与脱硫废水零排放的研究;首先测试了脱硫废水蒸发处理后细颗粒物物性的变化,研究了典型工况下脱硫废水蒸发处理对电除尘器脱除细颗粒物的促进效果,并考察了化学团聚协同脱硫废水蒸发处理对细颗粒物脱除的增强作用及其影响因素。结果表明,脱硫废水雾化液滴可以黏附细颗粒物,促进细颗粒物长大,典型工况下脱硫废水蒸发处理可以促进电除尘对细颗粒物的脱除,出口浓度降低10 ~ 25%。脱硫废水含固量大于5%时,蒸发处理对细颗粒物脱除的促进效果明显降低。化学团聚协同脱硫废水蒸发处理后,雾化液滴团聚性能有较大改善,可以显著增强电除尘脱除细颗粒物性能,细颗粒物降低20 ~ 40%。脱硫废水高含盐量会降低团聚协同促进效果,部分团聚剂性能大幅减弱;团聚剂高分子链上的吸附结合基团部分被雾化液滴中固体析出物所占据,相同团聚剂浓度下,化学团聚协同脱硫废水蒸发处理效果要弱于化学团聚效果。 根据湿法烟气脱硫系统中细颗粒物来源及产生特点,开展了应用化学团聚降低WFGD系统细颗粒物排放的研究,利用模拟湿法脱硫试验台研究了化学团聚抑制脱硫过程中细颗粒物形成的效果及其影响因素,并进一步在燃煤热态试验台进行了脱硫浆液中添加化学团聚剂的试验研究。结果表明,湿法脱硫细颗粒物排放与浆液中细颗粒物含量呈正相关,添加化学团聚剂后,颗粒物粒径分布峰向粒径增大的方向移动,浆液中细颗粒物减少,塔出口细颗粒物排放浓度降低。脱硫浆液温度、浓度、pH值和杂质离子含量对团聚效果有影响,这些因素一方面影响脱硫浆液中石膏晶体的粒度分布,一方面影响团聚剂的性能。采用燃煤热态试验台时,添加化学团聚液可降低塔出口细颗粒物排放,但与模拟湿法脱硫试验台相比,由于脱硫浆液中含有较多燃煤飞灰等杂质,团聚效果有所减弱。
英文题目 RESEARCH ON THE REMOVAL OF FINE PARTICLES BY CHEMICAL AGGLOMERATION
英文主题词 PM2.5,chemical agglomeration,desulfurization wastewater evaporation,electrostatic precipitator,Wet flue gas desulphurization
英文摘要 Haze pollution has been a serious atmospheric environmental problem as a function of the massive emission of fine particles (PM2.5). Due to the high specific surface area, a large amount of toxic heavy metals and other elements can be adsorbed on the surface of PM2.5, and the fine particles cannot be separated by conventional dust collecting equipment. Improving the control of PM2.5 emissions is one of the main targets with respect to reducing environmental pollution of coal-fired power stations. The utilization of flue gas conditioning, chemical agglomeration technology coupled existing pollution control facilities are most likely to achieve engineering application of PM2.5 disposal, which can realize collaborative removal of various pollutants. The effect of humidifying flue gas conditioning on dust characteristics and fine particle removed by electrostatic precipitator (ESP) were investigated. In addition, the synergistic removal of various pollutants induced by low low temperature electrostatic precipitator (LLESP), as well as the coupled humidifying flue gas conditioning for facilitating the reduction of pollutants, were analyzed. Experimental results showed that humidifying flue gas conditioning was beneficial for the removing of PM2.5, and higher concentration of PM2.5 resulted in more significant promoting effect. The humidification conditioning effect increased with the increasing of atomized water under the same flue gas temperature. Agglomeration characteristic of PM2.5 tended to increase as a function of sulfuric acid condensed by SO3 deposited on fly ash. Humidification conditioning cooperated with LLESP spurred the removal of SO3 and PM2.5. Based on the coal-fired thermal system, physical properties of PM2.5 with and without the addition of chemical agglomerant was exhibited, and the promoting effect of ESP by the presence of agglomerant was illustrated in typical operating condition. Besides, various experimental parameters like different agglomerants were tested. The experimental results performed that the peak particle size of number concentration increased from 0.15μm to 0.4μm with the addition of agglomerant, and the peak particle size keeps growing in the presence of wetting agent. Simultaneously, chemical agglomeration improved the removal efficiency of PM2.5 by 40% under the typical operating condition. The organic agglomerants present more significant effect than inorganic agglomerants due to the long molecular chain and plentiful effective groups. Chemical agglomeration effect could be enhanced by a series of methods, such as combining various agglomerants, adding wetting agent and lowering the resistance agent. The effect of chemical agglomeration increases with the concentration of agglomeration concentration. The pH value affected the formation of effective groups in the polymer chain, which led to the change of the chemical agglomeration effect. The moderate temperate of flue gas lay in the range of 140 ~ 160℃ as excessive temperature suppressed agglomeration performance, while the droplets evaporation was limited in low temperature. With the increasing of electrostatic precipitator voltage, the promotion effect was improved. In order to further synergistically facilitate the removal of PM2.5, experiments on preparing agglomeration solution using desulfurization wastewater were carried out, and the zero discharge of desulfurization wastewater was also studied. The physical properties of PM2.5 after the evaporation treatment of desulfurization wastewater were explored. The promoting effect of ESP by desulfurization wastewater evaporation was investigated in typical operating condition. Furthermore, the effect of chemical agglomeration combined with desulfurization wastewater evaporation on enhanced removal of PM2.5 was revealed. The result exhibited that atomized wastewater droplets could adhere to fine particles, and accelerated the growth of PM2.5. Moreover, desulfurization wastewater evaporation promoted the removing of PM2.5 by 10 ~ 25%. The promotive effect was inclined to decrease as the solid content in desulfurization wastewater was above 5%. The agglomeration performance of atomized droplets was dramatically improved when agglomerant added into desulfurization wastewater. The fine particles decreased by 20 ~ 40% at the outlet of ESP. The high salinity content in desulfurization wastewater was responsible for the adverse agglomeration performance. Based on the fine particles generated characteristics in the wet desulfurization process, chemical agglomeration inhibited fine particles generated in the process of desulfurization, and the influencing factors were studied in Simulated and Thermal state experiment platform. Results showed that fine particles in the outlet and fine particles content in the desulfurization slurry were positively correlated, after adding chemical agent, particle size distribution of peak increased, fine particles content in the desulfurization slurry reduced, fine particles emission concentration decreased at the outlet of desulfurization tower. Chemical agent type and concentration have important influence on fine particles emission, salt resistant agent effect is good, with the improving of agglomeration concentration, fine particle emissions reduced. Desulfurization slurry temperature, concentration, pH value and the impurity ions content also played a vital role in the agglomeration properties. On the one hand, these factors affected desulfurization gypsum crystals particle size distribution in the slurry, on the other hand impact on the performance of agglomerants, working condition of operating parameters. Using coal-fired thermal experiment platform, chemical agglomeration agent can reduce export fine particles emissions under the typical working conditions, due to the desulfurization serous contains more impurities such as coal fly ash, reunion effect is reduced.
学术讨论
主办单位时间地点报告人报告主题
973课题五启动组委会 2013.4.13 南京 刘勇 化学团聚前期研究
973武汉研讨会组委会 2014.11.14 武汉 刘勇 化学团聚进展
课题组学术研讨 2014.12.22 热能所会议室 刘勇 年终学术总结与规划
973杭州研讨会组委会 2015.09.11 杭州 刘勇 化学团聚现状与前沿
课题组学术讨论 2013.12.24 热能所会议室 刘勇 脱硫废水蒸发处理
课题组学术讨论 2013.06.18 热能所会议室 刘勇 燃煤飞灰团聚试验
课题组学术讨论 2014.07.11 热能所会议室 刘勇 燃煤多功能试验台搭建
课题组学术讨论 2014.09.02 热能所会议室 刘勇 燃煤多功能试验台调试
     
学术会议
会议名称时间地点本人报告本人报告题目
中国工程热物理学会年会 2014.10.31 西安 化学团聚对湿法脱硫系统PM2.5脱除性能的影响
2014第二届能源与环境科学进展国际会议 2014.06.21 广州 Experiments on the removal of fine particles in existing air pollution control devices by chemical agglomeration
2014年校庆报告 2014.05.21 东南大学 化学团聚促进湿法脱硫系统脱除细颗粒物的试验研究
2013年校庆报告 2013.05 东南大学 燃煤烟气PM2.5控制技术
     
代表作
论文名称
Improving the removal of fine particles with an electrostatic precipitator by chemical agglomeration
化学团聚促进电除尘脱除PM2.5的实验研究
化学团聚降低WFGD 系统PM2.5排放的试验研究
Experiments on the removal of fine particles in existing air pollution control devices by chemical a
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
黄亚继 正高 教授 博导 东南大学
袁竹林 正高 教授 博导 东南大学
段钰锋 正高 教授 博导 东南大学
杨宏旻 正高 教授 硕导 南京师范大学
薛建明 正高 研究员 硕导 国电科学技术研究院
      
答辩秘书信息
姓名职称工作单位备注
王沛 其他 工程师 东南大学