發(fā)布時間：2018-05-15 04:39

  本文選題：水泥 + 汞排放因子��； 參考：《浙江大學》2017年碩士論文

【摘要】：重金屬汞的污染在全球范圍內備受關注,水泥行業(yè)是我國繼燃煤和有色金屬冶煉后的第三大人為汞污染源,是我國大氣汞排放控制重點關注的對象。2013年頒布的《水泥工業(yè)大氣污染物排放標準》將汞及其化合物納入了煙氣污染物控制范圍,并確定了排放極限為0.05mg/Nm3,這標志著我國開始著手對水泥行業(yè)汞污染進行控制。但由于起步晚,在控制技術和控制策略上有眾多空白。開展水泥生產線的大氣汞排放特征及減排潛力研究,對掌握我國水泥行業(yè)的汞污染基本情況、實施相關控制措施及出臺有關治理政策都有重要意義。本文對11條不同規(guī)模的典型水泥生產線進行了現(xiàn)場測試,獲得了其大氣汞排放因子及煙氣汞的形態(tài)分布,分析了窯尾除塵器、生料磨、SNCR的協(xié)同脫汞能力。針對生料磨協(xié)同脫汞機理開展了實驗模擬研究。論文還對未來我國水泥行業(yè)大氣汞的減排潛力進行了探討。結果表明,我國水泥生產線平均大氣汞排放因子為65.33mg/t水泥,2016年水泥行業(yè)大氣汞排放量為163.33t,就其排放形態(tài)而言,零價汞、二價汞、顆粒汞所占比例分別是60%、22.5%和15.5%。生料磨協(xié)同脫汞效率均值是84%,且受其形式影響:管式和立式生料磨的協(xié)同脫汞效率均值分別是37.15%和72%。靜電除塵器和布袋除塵器的協(xié)同脫汞效率分別為35%和63%,靜電除塵器協(xié)同脫汞效率比布袋差。除塵器對形態(tài)汞的脫除能力分別是:顆粒汞零價汞二價汞。SNCR對水泥生產線大氣汞排放幾乎沒有影響,但是SNCR的運行不利于除塵器對煙氣汞的脫除。本文在最后對未來我國水泥行業(yè)大氣汞的減排前景和現(xiàn)有設備的協(xié)同脫汞潛力進行了探討。結果表明雖然現(xiàn)有設備具有相當?shù)臏p排潛力,但是仍難滿足我國未來的減排需求,需要引入其它汞污染控制技術。
[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.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ172.6

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本文編號：1891031