【摘要】：燃煤煙氣污染物資源循環(huán)利用是煙氣污染治理的發(fā)展方向,為探究直接電解氨基濕法脫硫脫硝吸收液制備過硫酸銨進(jìn)行資源化回收的可行性,在板框式隔膜流動電解槽中考察了硫酸銨濃度、硫氰酸銨濃度、硫酸濃度、溫度、電流密度、流速、電解時(shí)間以及吸收液中雜質(zhì)成分等工藝參數(shù)對電解制備過硫酸銨的影響特性。結(jié)果表明,吸收液中的尿素和氨水對電流效率有抑制作用,而SO32-和NO3-對電流效率幾乎沒有影響,模擬吸收液的電流效率僅為69.88%,遠(yuǎn)低于單一電解硫酸銨溶液86.98%的電流效率。對吸收液采取去除尿素、亞硫酸根氧化和吸收液pH調(diào)節(jié)(pH=2.2)預(yù)處理后,其電流效率達(dá)到85.12%。氨基濕法脫硫脫硝吸收液電解工藝不僅可高效制備過硫酸銨,陰極還可副產(chǎn)氫氣,電解結(jié)晶后余液進(jìn)一步與氨基濕法脫硫脫硝循環(huán)吸收液耦合,還可較大提升煙氣脫硝效率,是一種新型的綠色高效的煙氣凈化技術(shù)路線,具有極大的發(fā)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.
【作者單位】： 東南大學(xué)能源與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51376047)~~
【分類號】：TQ113.73;X701

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