炼铁烧结除尘灰湿法脱除模拟烟气中的SO_2
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摘要
为了考察炼铁烧结除尘灰作为脱硫剂的效果,研究了湿法脱硫过程中固液比、氧气含量、吸收剂温度、气体流速、进口SO_2质量浓度、搅拌强度等影响因素对脱除效率的影响规律。结果表明,最佳反应温度为25℃;随着温度升高,SO_2溶解度降低,吸收液对SO_2吸收能力降低;气体流量增加,SO_2在吸收剂中停留时间变短,导致脱除率降低;固液比增加,气固接触概率也随之增大,SO_2脱除率也增大;进口SO_2质量浓度的提高导致液相中氢氧根消耗加剧,使反应速率减慢,不利于对SO_2的去除。同时发现,SO_2浓度增加则溶解分数减小,吸收率也会随之降低;搅拌速率的增加使得气泡破碎加剧,增大气液接触面积,使除尘灰充分悬浮在液相中,与溶液中的SO_2迅速反应,有利于SO_2的吸收。O_2含量增加,有利于O_2的溶解,增加了化学反应的推动力,有利于SO_2吸收反应的进行。除尘灰对含二氧化硫气体具有较好的脱硫效果,有一定的应用前景。
In this study, the produced dust from iron-sintering work was used as the desulfurizer. Then the effects of factors in the wet desulphurization process, such as solid-liquid ratio, oxygen content, absorbent temperature, gas flow rate, inlet SO_2 mass concentration and stirring intensity on SO_2 removal efficiency were studied. The results showed that the optimum desulphurization temperature was 25 ℃, and with the increase of temperature, SO_2 solubility and its absorption capacity by the absorption solution also dropped. As the gas flow rate increased, SO_2 retention time in absorption solution decreased, then SO_2 removal efficiency was also reduced accordingly. Meanwhile, an increased solid-liquid ratio could lead to the improvement of gas solid contact probability SO_2 removal ratio. However, the rise of inlet SO_2 mass concentration could increase the OHconsumption in liquid phase, and slowed the wet desulphurization reaction rate which was against the SO_2 removal. Meanwhile, the rise of SO_2 concentration also caused the decrease of SO_2 dissolution ratio and adsorption ratio. The increase of the stirring intensity intensified the bubble breakage, enlarged the gas-liquid contact area, then the iron smelting sintering dust could fully suspend in the liquid phase and rapidly reacted with SO_2, thus, the SO_2 absorption was strengthened. Furthermore, the increase of oxygen concentration was conducive to its dissolution, the driving force of the chemical reaction was enhanced, and SO_2 absorption reaction was facilitated. Dust from iron-sintering work has showed a considerable desulfurization efficiency and some application prospects.
In this study, the produced dust from iron-sintering work was used as the desulfurizer. Then the effects of factors in the wet desulphurization process, such as solid-liquid ratio, oxygen content, absorbent temperature, gas flow rate, inlet SO_2 mass concentration and stirring intensity on SO_2 removal efficiency were studied. The results showed that the optimum desulphurization temperature was 25 ℃, and with the increase of temperature, SO_2 solubility and its absorption capacity by the absorption solution also dropped. As the gas flow rate increased, SO_2 retention time in absorption solution decreased, then SO_2 removal efficiency was also reduced accordingly. Meanwhile, an increased solid-liquid ratio could lead to the improvement of gas solid contact probability SO_2 removal ratio. However, the rise of inlet SO_2 mass concentration could increase the OHconsumption in liquid phase, and slowed the wet desulphurization reaction rate which was against the SO_2 removal. Meanwhile, the rise of SO_2 concentration also caused the decrease of SO_2 dissolution ratio and adsorption ratio. The increase of the stirring intensity intensified the bubble breakage, enlarged the gas-liquid contact area, then the iron smelting sintering dust could fully suspend in the liquid phase and rapidly reacted with SO_2, thus, the SO_2 absorption was strengthened. Furthermore, the increase of oxygen concentration was conducive to its dissolution, the driving force of the chemical reaction was enhanced, and SO_2 absorption reaction was facilitated. Dust from iron-sintering work has showed a considerable desulfurization efficiency and some application prospects.
引文
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[18]汤争光,蒋文举.软锰矿催化氧化二氧化硫的过程与机理研究[J].环境科学与技术2008,31(2):13-37.
[19]朱晓帆,涂海燕.搅拌强度对软锰矿浆湿法脱硫反应的影响[J].四川大学学报(工程科学版),2002,34(1):121-123.
[20]郭翠香,肖维鹏.软锰矿催化氧化脱除烟气中的SO2[J].污染防治技术,2003,16(4):66-67.
[2]赵健植,金保升,仲兆平,等.石灰石/石膏湿法烟气脱硫技术的模糊综合评价[J].锅炉技术,2006,37(6):70-80.
[3]陈绍敏.珞璜电厂湿式石灰石-石膏法脱硫系统运行中存在的问题及其分析[J].热力发电,2004,33(7):46-48
[4]朱保山.燃煤锅炉大气污染物净化技术手册[M].北京:中国电力出版社,2006:10.
[5]钱堃.新钢11号高炉炸瘤生产实践[J].中国锰业,2018,36(3):146-158.
[6]李石雷.磷矿浆脱除硫化氢实验研究[J].昆明理工大学学报,2017,42(5):105-111.
[7]卓广澜,陈银飞.脱除SO2的催化方法研究进展[J].化工生产与技术,1999(1):18-32.
[8]刘卉卉.低浓度SO2磷矿浆液相催化氧化净化研究[D].昆明:昆明理工大学,2005.
[9]刘卉卉,宁平.磷矿浆催化氧化湿法脱硫研究(Ⅱ)[J].化工矿物与加工,2006,34(2):10-12.
[10]焦倩,袁守谦,许传才,等.铁合金渣用于钢水脱硫的实验研究[J].铁合金,2010,41(6):18-21.
[11]张东力,王晓鸣,邹宗树,等.LF泡沫精炼渣脱硫动力学的实验研究[J].钢铁研究,2003,31(3):16-18.
[12]马先林,付全军,罗蜀峰,等.湿法磷酸脱硫工艺研究[J].磷肥与复肥,2015,30(4):7-9.
[13]RAYMUNDO-PINERO E,CAZORLA-AMOROS D,MORALLON E.Catalytic oxidation of sulfur dioxide by activated carbon:A physical chemistry experiment[J].Journal of Chemical Education,1999,76(7):958-961.
[14]马豫,于丽丽,唐晓龙,等.低浓度硫化氢液相催化氧化动力学实验研究[J].昆明理工大学学报(理工版),2009,34(3):79-82.
[15]SHI Y H,FAN M H.Reaction kinetics for the catalytic oxidation of sulfur dioxide with microscale and nanoscale iron oxides[J].Industrial&Engineering Chemistry Research,2007,51(3):1158-1165.
[16]张玉,周集体,王栋,等.FeSO4溶液催化氧化脱除烟气中SO2研究[J].大连理工大学学报,2004,44(1):60-64.
[17]孙文寿,蔡杰,陈侠.煤浆催化氧化法烟气脱硫研究[D].青岛:青岛大学,2006.
[18]汤争光,蒋文举.软锰矿催化氧化二氧化硫的过程与机理研究[J].环境科学与技术2008,31(2):13-37.
[19]朱晓帆,涂海燕.搅拌强度对软锰矿浆湿法脱硫反应的影响[J].四川大学学报(工程科学版),2002,34(1):121-123.
[20]郭翠香,肖维鹏.软锰矿催化氧化脱除烟气中的SO2[J].污染防治技术,2003,16(4):66-67.