活性矿浆湿法脱硫技术工程应用研究
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摘要
以活性矿浆为烟气脱硫剂,采用湿法脱硫技术,对冶炼过程产生的低浓度SO_2烟气进行脱硫工程化应用研究。由结果可知:活性矿浆平均硫容可达到3.78 kg/m~3,当入口烟气量在80 000—100 000 m~3/h,SO_2质量浓度在3 000—5 000 mg/m~3时,液汽比控制在6—9 L/m~3,平均脱硫效率能够达到94%,最高可达到99%,随着吸收时间的增加,活性矿浆pH值逐渐降低,当pH值在7.0—7.5时,循环液形成缓冲体系,吸收过程达到动态平衡,pH值下降趋势减缓,此时尾气能够稳定达标;当pH值<7.0时,pH值急剧下降,此时尾气会存在超标现象。此外,由于活性矿浆高含固、易沉降的特性,在工程化应用中塔型结构选用空塔,并在塔底设置相应的防沉降装置。
The engineering application of wet desulfurization technology of the low concentration SO_2 smelting flue gas was researched with active ore slurry as desulfurizer. The results indicate that the average sulfur capacity of the active ore slurry can reach 3. 78 kg / m~3 and the average desulfurization efficiency can reach 94% and the maximum is 99%when the inlet flue gas amount is 80 000-100 000 m~3/ h and the SO_2 mass concentration is 3 000-5 000 mg / m~3 and the liquid-gas ratio is controlled in the range of 6-9 L / m~3. Along with the increasing of the absorption time,the p H value decreases gradually. When the p H value is in the range of 7. 0-7. 5,the circulating fluid becomes buffer system and the absorption process achieves to the dynamic balance and the downward tendency of the p H value is slow,which can guarantee the offgas emission standard. When the p H value is under 7. 0,it decreases dramatically and the exhaust overstandard phenomenon exists. Because of the speciality of high solid content and easy sedimentation of the active ore slurry,the hollow tower structure was applicated on the engineering and the precipitation device was set on the bottom of the tower.
The engineering application of wet desulfurization technology of the low concentration SO_2 smelting flue gas was researched with active ore slurry as desulfurizer. The results indicate that the average sulfur capacity of the active ore slurry can reach 3. 78 kg / m~3 and the average desulfurization efficiency can reach 94% and the maximum is 99%when the inlet flue gas amount is 80 000-100 000 m~3/ h and the SO_2 mass concentration is 3 000-5 000 mg / m~3 and the liquid-gas ratio is controlled in the range of 6-9 L / m~3. Along with the increasing of the absorption time,the p H value decreases gradually. When the p H value is in the range of 7. 0-7. 5,the circulating fluid becomes buffer system and the absorption process achieves to the dynamic balance and the downward tendency of the p H value is slow,which can guarantee the offgas emission standard. When the p H value is under 7. 0,it decreases dramatically and the exhaust overstandard phenomenon exists. Because of the speciality of high solid content and easy sedimentation of the active ore slurry,the hollow tower structure was applicated on the engineering and the precipitation device was set on the bottom of the tower.
引文
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[2]赵燕,秦磊,王玲,等.烟气湿法脱硫剂的研究进展及工程案例分析[J].中国材料科学与设备,2014(3):33-35.
[3]彭康,李皓瑜.低浓度二氧化硫冶炼烟气处理工艺[J].化学工业与工程技术,2010,31(6),49-54.
[4]吴复忠,李水娥,金会心.软锰矿浆烧结烟气脱硫研究[J].有色金属(冶炼部分),2014(4):4-6.
[5]陈鸽翔.挥发窑烟气脱硫工艺选择及工业化应用[J].中国有色冶金,A生产实践篇·综合利用与环保,2015(2):56-60.
[6]温德清,王正辉,王玉山.金川镍矿浮选尾砂的物质组成及开发应用研究[J].矿物岩石地球化学通报,2001,20(3):198-201.
[7]陆永祺,姜山,朱天乐.氧化镁脱硫结垢研究[J].环境污染治理技术与设备,2003,4(5):19-22.
[8]陈莲芳,徐夕人.湿法烟气脱硫系统p H值的控制指标[J].动力工程,2005,25(5):733-736.