摘要
在自制反应器中,研究了烟气温度、Fenton试剂温度、初始p H值、NO初始浓度、烟气流量、n(Fe^(2+))/n(H_2O_2)和溶液中Cl^-等对Fenton法氧化脱除NO的影响。从单因素不同取值带来的NO氧化率的波动幅度来看,烟气流量对NO的氧化效率影响最为显著,试剂温度、NO初始浓度和n(Fe^(2+))/n(H_2O_2)的影响次之,而烟气温度和初始p H值影响较小。分别选取烟气温度为70℃,Fenton试剂温度为25℃,烟气流量为400~600 m L/min,NO初始浓度为982 mg/m^3,初始p H值为3,以及n(Fe^(2+))/n(H_2O_2)为0.05∶1时,对应的NO氧化效率较好。而溶液中Cl^-的存在,则会降低NO的氧化效率。此外,以原位滴加方式获得的Fenton体系,有效提高了寿命极短的(·OH)自由基的产出率和利用率,从而提高了NO的氧化效率。
The effect of flue gas temperature（T_（gas））,Fenton reagent’s temperature（T_（liq））,initial p H value,NO initial concentration（C^0_（NO））,gas flow and moral rate of Fe^（2＋） to H_2O_2 on the oxidation efficiency of NO were investigated in a selfdesigned reactor.From the point of the fluctuation ranges of oxidation efficiency of NO which resulted from different value of single factors,the results showed that the gas flow had a significant impact on the oxidation efficiency of NO,followed by the effect of the reagent temperature,NO initial concentration and moral rate of Fe^（2＋） to H_2O_2,while the flue gas temperature and initial p H value had little effect.The optimum removal conditions were obtained as T_（gas）of 70℃,T_（liq）of 25℃,gas flow of400~600 m L/min,C^0_（NO） of 982 mg/m^3,initial p H of 3,moral rate of Fe^（2＋） to H_2O_2 of 0.05∶1.And the existence of Cl^-in the system decreased the oxidation efficiency of NO.In addition,the in situ dripping addition of Fe^（2＋） and H_2O_2 improved the production and utilization of free radical（·OH）effectively,which enhanced the oxidation efficiency of NO significantly.
出处
《环境工程》
CAS
CSCD
北大核心
2017年第12期98-104,共7页
Environmental Engineering
基金
国家重点研发计划(2016YFC0209202)
国家自然科学基金海外青年基金(51550110237)
河北省重点基金(E2016202361)
关键词
燃煤烟气
FENTON
氧化
脱硝
coal-fired flue gas
Fenton
oxidation
denitrification
