燒結(jié)煙氣氨-Fe（Ⅱ）EDTA法同時(shí)脫硫脫硝中試研究
發(fā)布時(shí)間：2018-11-20 12:25
【摘要】：隨著燒結(jié)煙氣中SO2和NOX排放標(biāo)準(zhǔn)日益嚴(yán)格，燒結(jié)工序已成為鋼鐵行業(yè)大氣污染防治的一個(gè)重點(diǎn)環(huán)節(jié)。并且由于濕法同時(shí)脫硫脫硝具有操作費(fèi)用小、設(shè)備簡(jiǎn)單、脫除效率高等優(yōu)點(diǎn)，已成為該領(lǐng)域關(guān)注和研究的熱點(diǎn)課題。本文將氨法脫硫工藝與Fe(II)EDTA絡(luò)合吸收NO技術(shù)相結(jié)合，在中試吸收塔反應(yīng)器中進(jìn)行氨-Fe(II)EDTA法同時(shí)脫硫脫硝的研究，為濕法同時(shí)脫硫脫硝的工業(yè)應(yīng)用進(jìn)行了有益的探索，獲得了大量的基礎(chǔ)數(shù)據(jù)。 首先本文優(yōu)化了中試吸收塔結(jié)構(gòu)性能，結(jié)果表明最優(yōu)吸收塔結(jié)構(gòu)參數(shù)為：塔型為填料塔、φ25mm鮑爾環(huán)作填料、填料層高度900mm、液氣比12L/m3。 其次考察了煙氣性質(zhì)和漿液性質(zhì)等對(duì)氨-Fe(II)EDTA法對(duì)同時(shí)脫硫脫硝的影響。在煙氣性質(zhì)中，，增大煙氣流量、氧化空氣量、NO濃度不利于NO的吸收；當(dāng)漿液溫度相同時(shí)，改變煙氣溫度對(duì)SO2和NO的吸收的影響并不明顯；本實(shí)驗(yàn)中改變SO2濃度對(duì)SO2和NO的吸收的影響不明顯。在漿液性質(zhì)中，增大(NH4)2SO4濃度和漿液溫度不利于NO的吸收，當(dāng)(NH4)2SO4濃度由0.0增至3.5mol/L時(shí)，初始脫硝效率由90.63%降低到44.12%；隨著Fe(II)EDTA濃度、SO32-濃度，以及吸收液pH的增大，F(xiàn)e(II)EDTA絡(luò)合吸收NO的容量增大，特別是SO32-的存在，明顯的提高了絡(luò)合劑的使用壽命，當(dāng)SO32-濃度為0.3mol/L時(shí)，反應(yīng)進(jìn)行30min后，脫硝效率僅下降了16.46%；Cl-對(duì)SO2和NO的吸收沒(méi)有影響。 最后對(duì)Fe(II)EDTA絡(luò)合吸收劑的鐵法再生分別進(jìn)行了再生罐和再生塔兩種方案的對(duì)比研究，同時(shí)考察了影響鐵法再生的因素。結(jié)果表明，再生塔再生效果較好，脫硝效率維持在60%以上；比表面積大、表面氧化少，且表面無(wú)油的鐵屑作再生塔填料時(shí)脫硝效果最好；增加鐵屑質(zhì)量和增大鐵屑堆積密度有利于再生塔再生；(NH4)2SO4雖阻礙Fe(II)EDTA絡(luò)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.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X757
本文編號(hào)：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.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X757
【引證文獻(xiàn)】
相關(guān)會(huì)議論文 前1條
1 王靖;黃妍;張俊豐;;基于亞鐵螯合物絡(luò)合吸收的NO和NO_2協(xié)同凈化實(shí)驗(yàn)研究[A];第二十屆 SO2、NOX、PM2.5、Hg 污染控制技術(shù)研討會(huì)論文集[C];2016年
相關(guān)碩士學(xué)位論文 前1條
1 秦梁;Fe~ⅡEDTA/CH_3COONa溶液同時(shí)脫除煙氣中SO_2和NO的研究[D];大連理工大學(xué);2016年
本文編號(hào)：2344908
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