摘要
在超低排放要求下,氧化法烟气脱硝技术受到重视。该文在连续恒定微波场中,65℃以下考察了活性炭辅助Fenton试剂低温催化氧化NO的效果,研究了气量、NO浓度、活性炭粒径、活性炭种类等气固相参数对氧化的影响,发现并分析CO生成等二次污染问题,定义无量纲参数用以评估脱硝经济性。结果显示:气量、NO浓度、活性炭粒径、活性炭种类等气固相参数是影响NO脱除效率的重要因素,其中果壳基活性炭最佳,脱除效率可达41.1%;辅助Fenton试剂氧化NO的同时产生了部分CO,CO生成量与微波功率及活性炭添加量正相关;Fenton试剂经济性随反应时间呈现先高后低趋势,辅助Fenton试剂经济性稳定,后期可高于Fenton试剂;脱硝系统长期运行时,低功率微波、低剂量活性炭的添加可在保证低CO生成量的前提下提高脱硝经济性。
Under the demand of ultra-low pollutant emissions,flue-gas denitration technology based on oxidation become more and more important.In this paper,the effect of NO catalytic low-temperature oxidation through Fenton solution assisted by activated carbon was researched in the microwave field.The effect of gas-liquid parameters on NO oxidation,including gas volume,NO inlet concentration,activated carbon particles,activated carbon kinds were investigated,and the secondary pollution problem,such as CO generation was analysed,and non-dimensional parameter was defined to evaluate the cost of denitration technology.The results indicate that,gas-liquid parameters are important factors which will effect NO oxidation efficiency,including gas volume,NO inlet concentration,activated carbon particles,activated carbon kinds,etc,and the efficiency of pericarp AC is the highest which can reach 41.1%;assisted Fenton solution produces CO during NO oxidation process,and the CO quantity is associated with microwave power and activated carbon dose.The efficiency of Fenton tends to rise at first and decrease later,while the cost of assisted Fenton tends to be stable,and can be higher than Fenton reagent later. When denitration system operates for a long time,adding low power microwave and low dose activated carbon can increase denitration cost-effectiveness and ensure low CO generation.
作者
李晓东
高建民
于经伟
杜谦
吴少华
LI Xiaodong;GAO Jianmin;YU Jingwei;DU Qian;WU Shaohua(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第12期206-212,共7页
Environmental Science & Technology
基金
国家自然科学基金项目(51576056)
关键词
芬顿试剂
催化作用
氧化
活性炭
微波辐射
NO
Fenton reagent
catalysis
oxidation
activated carbon
microwave radiation
nitric oxide