Enhancement Of The Removal Efficiency Of NO_x From Flue Gas By Pulsed Disharge With Corona-Activated Propene

In this paper, a nozzle electrode for propene activation was installed in the front of corona wires in order to enhance the role of propene in NO_x removal by pulsed discharge. The configuration of corona wires and nozzle electrode in deNO_x reactor was optimized experimentally; Effect of four kinds of propene-activating methods on enhancement of NO/NO_x removal by pulsed discharge was investivated respectively, and positive DC power supply was selected for activating propene; experiments of corona propene activation on NO/NO_x removal by pulsed discharge with sulfur dioxide present in the flue gas were also conducted. The results were listed below:1. The energy of primary streamer inputted into reactor was higher when the ratio of wire-to-wire spacing(b) to plate-to-plate spacing (d) satisfied the relationship of b/d=0.4～0.6.2. Discharge power of nozzle electrode increased with the number of nozzles, the reasonable spacing between nozzles and the interlaced distribution of nozzles, and higher discharge efficiency could be obtained for a length-fixed nozzle electrode in this experiment when the nozzle-to-nozzle spacing was 56mm.3. Electrode configuration had effect on the input energy, removal rate, energy cost and yield of NO/NO_x removal. Under the same energy cost, higher de-NO/de-NO_x rate and energy yield reached with propene present in the flue gas when hybrid nozzle-wire electrodes were used as the discharge electrodes.4. When propene was injected from fore pipeline into reacor with the molar ratio of C₃H₆ to NO_x being 1, de-NO and de-NO_x rates increased 54ï¼…and 14ï¼…; the energy yield increased 27g N/kWh and 10.6g N/kWh; and the energy cost decreased 41eV/molecule (NO) and 63eV/molecule (NO_x) respectively.5. Both DC and pulsed corona discharge could activate propene and improve the de-NO and de-NO_x efficiency of pulsed discharge reactor. Taking most of factors into consideration, positive DC corona propene activation could present a better performance in NO/NO_x removal. De-NO and de-NO_x rates increased 15～25ï¼…and 3～7ï¼…respectively by positive DC corona C₃H₆ activation under the energy density of 0.2～0.26Wh·Nm^-3. 6. With both sulfur dioxide and nitrogen oxides present in the flue gas, when propene was injected from fore pipeline into reactor with the molar ratio of C₃H₆ to NO_x being 1, de-NO and de-NO_x rates of pulsed discharge reactor increased 25ï¼…and 21ï¼…respectively, but propene had little effect on SO₂ removal; corona-actived propene could increase de-NO and de-NO_x rates of pulsed discharge reactor over 10ï¼….