氨基湿法脱硫脱硝吸收液电解制备过硫酸铵
发布时间：2018-08-29 11:38
【摘要】：燃煤烟气污染物资源循环利用是烟气污染治理的发展方向,为探究直接电解氨基湿法脱硫脱硝吸收液制备过硫酸铵进行资源化回收的可行性,在板框式隔膜流动电解槽中考察了硫酸铵浓度、硫氰酸铵浓度、硫酸浓度、温度、电流密度、流速、电解时间以及吸收液中杂质成分等工艺参数对电解制备过硫酸铵的影响特性。结果表明,吸收液中的尿素和氨水对电流效率有抑制作用,而SO32-和NO3-对电流效率几乎没有影响,模拟吸收液的电流效率仅为69.88%,远低于单一电解硫酸铵溶液86.98%的电流效率。对吸收液采取去除尿素、亚硫酸根氧化和吸收液pH调节(pH=2.2)预处理后,其电流效率达到85.12%。氨基湿法脱硫脱硝吸收液电解工艺不仅可高效制备过硫酸铵,阴极还可副产氢气,电解结晶后余液进一步与氨基湿法脱硫脱硝循环吸收液耦合,还可较大提升烟气脱硝效率,是一种新型的绿色高效的烟气净化技术路线,具有极大的发展前景。
[Abstract]:The recycling utilization of pollutants from coal-fired flue gas is the development direction of flue gas pollution control. In order to explore the feasibility of producing ammonium persulfate from direct electrolytic wet ammonia desulphurization and denitrification absorbent solution for recycling. The concentration of ammonium sulfate, ammonium thiocyanate, sulfuric acid concentration, temperature, current density and flow rate were investigated in a plate-frame membrane flow electrolyzer. The influence of electrolysis time and impurities in the absorbent on the preparation of ammonium persulfate by electrolysis. The results show that urea and ammonia in absorbent have inhibitory effect on current efficiency, while SO32- and NO3- have little effect on current efficiency. The current efficiency of simulated absorbent is only 69.88, which is much lower than that of single electrolytic ammonium sulfate solution (86.98%). After urea removal, sulfite oxidation and pH=2.2 pretreatment, the current efficiency of the absorbent was 85.125.12. The electrolysis process of amino wet desulfurization and denitrification absorbent not only can produce ammonium persulfate efficiently, but also can produce hydrogen by cathode. The residual liquid after electrolytic crystallization is further coupled with the cyclic absorbent of amino wet desulphurization and denitrification, and the efficiency of flue gas denitrification can be greatly improved. It is a new type of green and efficient flue gas purification technology, and has a great development prospect.
【作者单位】： 东南大学能源与环境学院;
【基金】：国家自然科学基金项目(51376047)~~
【分类号】：TQ113.73;X701
本文编号：2211085
[Abstract]:The recycling utilization of pollutants from coal-fired flue gas is the development direction of flue gas pollution control. In order to explore the feasibility of producing ammonium persulfate from direct electrolytic wet ammonia desulphurization and denitrification absorbent solution for recycling. The concentration of ammonium sulfate, ammonium thiocyanate, sulfuric acid concentration, temperature, current density and flow rate were investigated in a plate-frame membrane flow electrolyzer. The influence of electrolysis time and impurities in the absorbent on the preparation of ammonium persulfate by electrolysis. The results show that urea and ammonia in absorbent have inhibitory effect on current efficiency, while SO32- and NO3- have little effect on current efficiency. The current efficiency of simulated absorbent is only 69.88, which is much lower than that of single electrolytic ammonium sulfate solution (86.98%). After urea removal, sulfite oxidation and pH=2.2 pretreatment, the current efficiency of the absorbent was 85.125.12. The electrolysis process of amino wet desulfurization and denitrification absorbent not only can produce ammonium persulfate efficiently, but also can produce hydrogen by cathode. The residual liquid after electrolytic crystallization is further coupled with the cyclic absorbent of amino wet desulphurization and denitrification, and the efficiency of flue gas denitrification can be greatly improved. It is a new type of green and efficient flue gas purification technology, and has a great development prospect.
【作者单位】： 东南大学能源与环境学院;
【基金】：国家自然科学基金项目(51376047)~~
【分类号】：TQ113.73;X701
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