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水泥生产过程中汞的排放特征及减排潜力研究

发布时间:2018-05-15 04:39

  本文选题:水泥 + 汞排放因子 ; 参考:《浙江大学》2017年硕士论文


【摘要】:重金属汞的污染在全球范围内备受关注,水泥行业是我国继燃煤和有色金属冶炼后的第三大人为汞污染源,是我国大气汞排放控制重点关注的对象。2013年颁布的《水泥工业大气污染物排放标准》将汞及其化合物纳入了烟气污染物控制范围,并确定了排放极限为0.05mg/Nm3,这标志着我国开始着手对水泥行业汞污染进行控制。但由于起步晚,在控制技术和控制策略上有众多空白。开展水泥生产线的大气汞排放特征及减排潜力研究,对掌握我国水泥行业的汞污染基本情况、实施相关控制措施及出台有关治理政策都有重要意义。本文对11条不同规模的典型水泥生产线进行了现场测试,获得了其大气汞排放因子及烟气汞的形态分布,分析了窑尾除尘器、生料磨、SNCR的协同脱汞能力。针对生料磨协同脱汞机理开展了实验模拟研究。论文还对未来我国水泥行业大气汞的减排潜力进行了探讨。结果表明,我国水泥生产线平均大气汞排放因子为65.33mg/t水泥,2016年水泥行业大气汞排放量为163.33t,就其排放形态而言,零价汞、二价汞、颗粒汞所占比例分别是60%、22.5%和15.5%。生料磨协同脱汞效率均值是84%,且受其形式影响:管式和立式生料磨的协同脱汞效率均值分别是37.15%和72%。静电除尘器和布袋除尘器的协同脱汞效率分别为35%和63%,静电除尘器协同脱汞效率比布袋差。除尘器对形态汞的脱除能力分别是:颗粒汞零价汞二价汞。SNCR对水泥生产线大气汞排放几乎没有影响,但是SNCR的运行不利于除尘器对烟气汞的脱除。本文在最后对未来我国水泥行业大气汞的减排前景和现有设备的协同脱汞潜力进行了探讨。结果表明虽然现有设备具有相当的减排潜力,但是仍难满足我国未来的减排需求,需要引入其它汞污染控制技术。
[Abstract]:The pollution of heavy metal mercury is concerned in the world, cement industry is the third adult after coal and non-ferrous metal smelting for mercury pollution. In 2013, the Standard for Atmospheric Pollutant Emission in cement Industry included mercury and its compounds in the control range of flue gas pollutants. The emission limit of 0.05 mg / N m 3 indicates that China has begun to control mercury pollution in cement industry. However, due to the late start, there are many gaps in control technology and control strategy. It is of great significance to study the atmospheric mercury emission characteristics and emission reduction potential of cement production line in order to grasp the basic situation of mercury pollution in cement industry in China, implement relevant control measures and issue relevant control policies. In this paper, 11 typical cement production lines with different scales were tested, and the mercury emission factors in atmosphere and the mercury speciation distribution in flue gas were obtained. The synergistic mercury removal capacity of kiln tail dust collector and SNCR was analyzed. An experimental simulation study was carried out on the mechanism of co-removal of mercury from raw meal mill. The potential of atmospheric mercury emission reduction in cement industry is also discussed in this paper. The results show that the average atmospheric mercury emission factor of cement production line in China is 65.33mg/t cement, and the atmospheric mercury emission of cement industry is 163.33 t in 2016. In terms of its emission form, the proportion of zero valence mercury, divalent mercury and particulate mercury is 60% 22. 5% and 15. 5% respectively. The average value of synergistic mercury removal efficiency of raw meal mill was 84 and was affected by its form: the mean value of synergistic mercury removal efficiency of tube mill and vertical raw meal mill was 37.15% and 72% respectively. The synergistic mercury removal efficiency of electrostatic precipitator and bag precipitator is 35% and 63% respectively. The efficiency of synergistic mercury removal of electrostatic precipitator is worse than that of cloth bag. The removal ability of precipitator to mercury speciation is as follows: particle mercury zero valence mercury bivalent mercury. SNCR has little effect on atmospheric mercury emission from cement production line, but the operation of SNCR is not conducive to the removal of mercury from flue gas by dust remover. At the end of this paper, the prospect of atmospheric mercury emission reduction in cement industry in China and the potential of synergistic mercury removal of existing equipment are discussed. The results show that although the existing equipment has considerable emission reduction potential, it is still difficult to meet the future emission reduction needs of China, and other mercury pollution control technologies should be introduced.
【学位授予单位】:浙江大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TQ172.6

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