烧结烟气氨-Fe（Ⅱ）EDTA法同时脱硫脱硝中试研究
发布时间：2018-11-20 12:25
【摘要】：随着烧结烟气中SO2和NOX排放标准日益严格，烧结工序已成为钢铁行业大气污染防治的一个重点环节。并且由于湿法同时脱硫脱硝具有操作费用小、设备简单、脱除效率高等优点，已成为该领域关注和研究的热点课题。本文将氨法脱硫工艺与Fe(II)EDTA络合吸收NO技术相结合，在中试吸收塔反应器中进行氨-Fe(II)EDTA法同时脱硫脱硝的研究，为湿法同时脱硫脱硝的工业应用进行了有益的探索，获得了大量的基础数据。 首先本文优化了中试吸收塔结构性能，结果表明最优吸收塔结构参数为：塔型为填料塔、φ25mm鲍尔环作填料、填料层高度900mm、液气比12L/m3。 其次考察了烟气性质和浆液性质等对氨-Fe(II)EDTA法对同时脱硫脱硝的影响。在烟气性质中，，增大烟气流量、氧化空气量、NO浓度不利于NO的吸收；当浆液温度相同时，改变烟气温度对SO2和NO的吸收的影响并不明显；本实验中改变SO2浓度对SO2和NO的吸收的影响不明显。在浆液性质中，增大(NH4)2SO4浓度和浆液温度不利于NO的吸收，当(NH4)2SO4浓度由0.0增至3.5mol/L时，初始脱硝效率由90.63%降低到44.12%；随着Fe(II)EDTA浓度、SO32-浓度，以及吸收液pH的增大，Fe(II)EDTA络合吸收NO的容量增大，特别是SO32-的存在，明显的提高了络合剂的使用寿命，当SO32-浓度为0.3mol/L时，反应进行30min后，脱硝效率仅下降了16.46%；Cl-对SO2和NO的吸收没有影响。 最后对Fe(II)EDTA络合吸收剂的铁法再生分别进行了再生罐和再生塔两种方案的对比研究，同时考察了影响铁法再生的因素。结果表明，再生塔再生效果较好，脱硝效率维持在60%以上；比表面积大、表面氧化少，且表面无油的铁屑作再生塔填料时脱硝效果最好；增加铁屑质量和增大铁屑堆积密度有利于再生塔再生；(NH4)2SO4虽阻碍Fe(II)EDTA络合吸收NO，但起到防止Fe(II)EDTA氧化的作用。
[Abstract]:With the increasingly stringent emission standards of SO2 and NOX in the sintering flue gas, the sintering process has become a key link in the prevention and control of air pollution in the iron and steel industry. Because of the advantages of low operating cost, simple equipment and high removal efficiency, simultaneous wet desulphurization and denitrification has become a hot topic in this field. In this paper, the ammonia desulfurization process and Fe (II) EDTA complex absorption NO technology are combined to study the simultaneous desulfurization and denitrification of ammonia and Fe (II) EDTA in a pilot reactor. The industrial application of wet simultaneous desulphurization and denitrification has been explored, and a lot of basic data have been obtained. Firstly, the structural properties of the pilot-scale absorption tower are optimized. The results show that the optimum structural parameters of the absorption tower are as follows: the tower type is packed column, 蠁 25mm Bauer ring is used as filler, the height of packing layer is 900mm, and the ratio of liquid to gas is 12L / m ~ (3). Secondly, the effects of flue gas properties and slurry properties on simultaneous desulfurization and denitrification by ammonia-Fe (II) EDTA process were investigated. In the nature of flue gas, increasing flue gas flow, oxidizing air volume and NO concentration are not conducive to the absorption of NO, but when the slurry temperature is the same, the influence of changing flue gas temperature on the absorption of SO2 and NO is not obvious. In this experiment, the effect of SO2 concentration on the absorption of SO2 and NO was not obvious. When the concentration of (NH4) 2SO4 increased from 0.0 to 3.5mol/L, the initial denitrification efficiency decreased from 90.63% to 44.12%. With the increase of the concentration of Fe (II) EDTA, the concentration of SO32-, and the increase of pH in absorbent solution, the capacity of, Fe (II) EDTA complexing and absorbing NO increases, especially the existence of SO32-, which obviously increases the service life of the complexing agent. When the concentration of SO32- was 0.3mol/L, the denitrification efficiency decreased 16.46% after 30min. Cl- had no effect on the absorption of SO2 and NO. Finally, the iron regeneration of Fe (II) EDTA complexing absorbent was compared with that of the regeneration tower, and the factors affecting the iron regeneration were also investigated. The results show that the regeneration efficiency of the regenerator is better, the denitrification efficiency is over 60%, the denitrification effect is the best when the iron scraps with no oil on the surface are used as fillers for the regenerating tower, and the specific surface area is large, the surface oxidation is less and the surface is free of oil. Increasing the quality of iron chips and increasing the density of iron chips is beneficial to the regeneration of regenerating tower. (NH4) 2SO4 can prevent the oxidation of Fe (II) EDTA even though it hinders the complex absorption of NO, by Fe (II) EDTA.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X757
本文编号：2344908
[Abstract]:With the increasingly stringent emission standards of SO2 and NOX in the sintering flue gas, the sintering process has become a key link in the prevention and control of air pollution in the iron and steel industry. Because of the advantages of low operating cost, simple equipment and high removal efficiency, simultaneous wet desulphurization and denitrification has become a hot topic in this field. In this paper, the ammonia desulfurization process and Fe (II) EDTA complex absorption NO technology are combined to study the simultaneous desulfurization and denitrification of ammonia and Fe (II) EDTA in a pilot reactor. The industrial application of wet simultaneous desulphurization and denitrification has been explored, and a lot of basic data have been obtained. Firstly, the structural properties of the pilot-scale absorption tower are optimized. The results show that the optimum structural parameters of the absorption tower are as follows: the tower type is packed column, 蠁 25mm Bauer ring is used as filler, the height of packing layer is 900mm, and the ratio of liquid to gas is 12L / m ~ (3). Secondly, the effects of flue gas properties and slurry properties on simultaneous desulfurization and denitrification by ammonia-Fe (II) EDTA process were investigated. In the nature of flue gas, increasing flue gas flow, oxidizing air volume and NO concentration are not conducive to the absorption of NO, but when the slurry temperature is the same, the influence of changing flue gas temperature on the absorption of SO2 and NO is not obvious. In this experiment, the effect of SO2 concentration on the absorption of SO2 and NO was not obvious. When the concentration of (NH4) 2SO4 increased from 0.0 to 3.5mol/L, the initial denitrification efficiency decreased from 90.63% to 44.12%. With the increase of the concentration of Fe (II) EDTA, the concentration of SO32-, and the increase of pH in absorbent solution, the capacity of, Fe (II) EDTA complexing and absorbing NO increases, especially the existence of SO32-, which obviously increases the service life of the complexing agent. When the concentration of SO32- was 0.3mol/L, the denitrification efficiency decreased 16.46% after 30min. Cl- had no effect on the absorption of SO2 and NO. Finally, the iron regeneration of Fe (II) EDTA complexing absorbent was compared with that of the regeneration tower, and the factors affecting the iron regeneration were also investigated. The results show that the regeneration efficiency of the regenerator is better, the denitrification efficiency is over 60%, the denitrification effect is the best when the iron scraps with no oil on the surface are used as fillers for the regenerating tower, and the specific surface area is large, the surface oxidation is less and the surface is free of oil. Increasing the quality of iron chips and increasing the density of iron chips is beneficial to the regeneration of regenerating tower. (NH4) 2SO4 can prevent the oxidation of Fe (II) EDTA even though it hinders the complex absorption of NO, by Fe (II) EDTA.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X757
【引证文献】
相关会议论文 前1条
1 王靖;黄妍;张俊丰;;基于亚铁螯合物络合吸收的NO和NO_2协同净化实验研究[A];第二十届 SO2、NOX、PM2.5、Hg 污染控制技术研讨会论文集[C];2016年
相关硕士学位论文 前1条
1 秦梁;Fe~ⅡEDTA/CH_3COONa溶液同时脱除烟气中SO_2和NO的研究[D];大连理工大学;2016年
本文编号：2344908
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