Abstract: The process of flue gas purification with H₂O₂ for nitrogen oxide abatement has become a resource-economical and environment-friendly technology. The influences of H₂O₂ concentration，pH values，the initial concentration of NO_x and temperature on the efficiency of denitrification were studied in a bubbling reactor. The feasibility of H₂O₂ matching different types of absorbent technology was also discussed in this paper and the optimal condition was achieved. The denitrification efficiency can be 43.96%，which were gained under the concentration of H₂O₂ 50%，pH value about 3，the temperature about 363 K，the initial concentration of NO_x about 450—500 mg/m³. The initial absorption efficiencies of 5% urea solution，slurry and water were 56.91%，51.77% and 50.12% respectively，where the flue gas was treated by 50% H₂O₂ solution. It was found that the efficiency declined with the time extended. Studies also showed that it could significantly slow the decline in the efficiency of denitrification when ethylenediamine was added in the urea solution.

Key words: hydrogen peroxide, oxidation, flue gas, nitrogen oxides

摘要： H₂O₂脱硝技术是面向燃煤烟气净化过程的环境友好型治理工艺。本文以江苏某热电厂燃煤烟气为处理对象，在自制鼓泡反应器上考察了H₂O₂浓度、pH值、NO_x初始浓度、温度等因素对H₂O₂脱硝性能的影响，初步探讨不同类型吸收剂吸收H₂O₂氧化后烟气的工艺可行性。研究表明，H₂O₂浓度为50%、pH=3、T=363 K、NO_x初始浓度为450～500 mg/m³时，脱硝效率可达到43.96%。当燃煤烟气经过50%H₂O₂溶液氧化之后，分别采用5%尿素、吸收塔浆液和水进行吸收，起始脱硝效率依次为56.91%、51.77%和50.12%。随着时间的延长，脱硝效率随之逐渐下降。在5%尿素溶液中加入乙二胺，可明显减缓脱硝效率下降趋势。

关键词: 过氧化氢, 氧化, 燃煤烟气, 氮氧化物