Research On Simultaneous Removal Mercury And Dioxins From Flue Gas With Non-thermal Plasma

With the continuous development of society,medical waste,garbage,hazardous waste produce more and more.These waste are usually processed with the burning method.Flue gas from incineration process contains both mercury and dioxins,the two substances handling is very difficult.Activated carbon adsorption treatment is used commonly,but high cost brings a lot of pressure for enterprise.Therefore,the development of efficient,energy-saving,environmental treatment process for the control of mercury and dioxins has a very important significance.In this thesis,line cylinder pulsed non-thermal plasma was used to control mercury and dioxins.The effect of pulsed non-thermal plasma power frequency and voltage on mercury removal efficiency was studied.The pulse non-thermal plasma power frequency,voltage,O2 content,water vapor content,initial concentration of1,2,4-trichlorobenzene and residence time for the degradation of 1,2,4-trichlorobenzene and simultaneous degradation on mercury and 1,2,4-trichlorobenzene was also studied.The results showed that:(1)As the voltage and frequency increased,the removal rate of mercury and 1,2,4-trichlorobenzene showed a tendency to increase gradually,showing that the higher the voltage and frequency,the better the removal efficiency(2)The removal efficiency of 1,2,4-trichloroenzene is greatly affected by the different O2 content.the higher the O2 content,the more favorable the removal of1,2,4-trichlorobenzene(3)The removal of 1,2,4-trichlorobenzene was improved with the addition of water vapor,but the removal rate of 1,2,4-trichlorobenzene increased first and then decreased with the addition of water vapor,water vapor content by 6% to 8% is relatively appropriate(4)The low initial concentration of 1,2,4-trichlorobenzene and the long time in the reactor is an important factor to promote the degradation rate.(5)Both the mercury and 1,2,4-trichlorobenzene existed in the simulated flue gas,and the reactor had high removal rate.On the basis of laboratory research,the field experiment was carried out on mercury-containing tail gas produced from waste mercury catalyst recovery in Guizhou and exhaust gas from Ningbo hazardous waste incineration.The experimental results showed that the pulsed non-thermal plasma bonded ceramic nano materials can achieve 97.8% removal rate of mercury,and the single pulse non-thermal plasma can remove 62.6% of the dioxins.Through the combination of theory and practice,it laid the foundation for the industrial application of pulsed non-thermal plasma in the field of mercury and dioxins co-control.