喷淋鼓泡塔内氨水对烟气中As2O3的吸收特性

doi:10.16085/j.issn.1000-6613.2019-0954

摘要/Abstract

摘要：

喷淋鼓泡塔内的反应是典型的气液两相流，为研究喷淋鼓泡内氨水对烟气中As₂O₃吸收特性，探索新型喷淋鼓泡技术的污染物一体化控制潜力，以空气和SO₂为模拟烟气，利用喷淋鼓泡吸收塔研究了液气比、浸液深度、氨水质量浓度、SO₂质量浓度对氨水吸收气相As₂O₃的影响。研究表明：氨水对As₂O₃的吸收效率随液气比增加先增大后趋于平缓；浸液深度增大，氨水吸收As₂O₃的效率降低；As₂O₃与氨水中OH^-作用生成的AsO₃^3-溶于氨水实现氨水对As₂O₃的吸收，氨水吸收As₂O₃的效率随氨水质量浓度的增大先上升后下降；碱性环境下，SO₂与NH₃作用生成SO₃^2-的水解增加了溶液中OH^-，促进了氨水对As₂O₃的吸收，又因SO₃^2-水解产生HSO₃^-电离出H⁺对部分OH^-中和以及NH₃挥发等因素，促进作用表现为吸收效率随SO₂质量浓度的增加先上升后下降。在氨水质量浓度为0.07%、SO₂质量浓度为525mg/m³、液气比10L/m³、浸液深度5cm时吸收效率达到最大82%。

关键词: 气液两相流, 喷淋鼓泡, 氨水, 吸收, As₂O₃脱除

Abstract:

The reaction in the spray-and-bubble column is a typical gas-liquid flow. In order to study the absorption characteristics of As₂O₃ in the flue gas by ammonia in spray-and-bubble column and explore the potential of the integrated control of pollutants by the novel spray-and-bubble technology, the spray-and-bubble column was employed to investigate the synergistic removal of As₂O₃ from flue gas using air and SO₂ as the simulated flue gas. Factors such as liquid-gas ratio, bubbling pipe depth, aqueous ammonia concentration and SO₂ concentration have been studied. Results showed that the As₂O₃ adsorption efficiency increases generally and then tends to be gentle with the liquid-gas ratio rising. The increase of immersion depth leads to the gradual decrease of absorption efficiency. The absorption efficiency of AsO₃^3- formed by the interaction between As₂O₃ and OH^- in ammonia dissolves in ammonia to achieve As₂O₃ absorption. Under alkaline environment, the hydrolysis of SO₃^2- generated by the reaction between SO₂ and NH₃ increases the OH^- in the solution to promote the absorption of ammonia to gas phase As₂O₃. The promotion effect first increases and then decreases with the increase of SO₂ concentration due to factors such as the neutralization of some of the OH^- by H⁺ in the NH₄HSO₃ and volatilization of NH₃. The absorption efficiency reaches the maximum of 82% when liquid-gas ratio is 10L/m³, immersion depth of 5cm, ammonia concentration of 0.07% and SO₂ concentration of 525mg/m³.

Key words: gas-liquid flow, spray-and-bubble, aqueous ammonia, adsorption, As₂O₃ removal

中图分类号:

TK 221

魏永久,张月,郭雨生,王春波,白涛. 喷淋鼓泡塔内氨水对烟气中As₂O₃的吸收特性[J]. 化工进展, 2020, 39(3): 834-841.

Yongjiu WEI,Yue ZHANG,Yusheng GUO,Chunbo WANG,Tao BAI. Absorption characteristics of As₂O₃ from flue gas by ammonia in spray-and-bubble column[J]. Chemical Industry and Engineering Progress, 2020, 39(3): 834-841.

图/表 10

图1 喷淋鼓泡吸收塔实验系统1—空气泵；2—节流阀；3—减压阀；4—转子流量计；5—气体混合器；6—数显仪；7—注射泵；8—加热装置；9—热电偶；10—电加热带；11—散射管；12—浆液补给仓；13—喷淋量调节阀；14—浆液循环泵；15—数显流量计；16—除雾器；17—搅拌器；18—溶液排出口；19—取样液面；20—排气管道；21—散射孔；22—氧化风机；23—内置连接管

表1 实验参数

参数	实验值
模拟烟气量/m³·h^-1	10
N₂流量/mL·min^-1	800
烟气入口温度/℃	120
As₂O₃入口温度/℃	300
SO₂质量浓度/mg·m^-3	0,175,350,525,700,875,1050
浆液质量分数/%	0.03,0.05,0.07,0.25,0.5,1
浸液深度/cm	5,8,11,14
液气比/L·m^-3	2,6,10,14,18

图2 不同液气比下塔内砷浓度随吸收时间变化

图3 液气比对脱砷效率和脱砷总量影响

图5 浸液深度对脱砷效率和脱砷总量影响

图7 氨水质量浓度对脱砷效率和脱砷总量影响

图9 SO2质量浓度对脱砷效率和脱砷总量影响

图4 不同浸液深度的塔内砷浓度随吸收时间变化

图6 不同氨水质量浓度下塔内砷浓度随吸收时间变化

图8 不同SO2质量浓度的塔内砷浓度随吸收时间变化

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喷淋鼓泡塔内氨水对烟气中As₂O₃的吸收特性

Absorption characteristics of As₂O₃ from flue gas by ammonia in spray-and-bubble column

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