Main Fundamental And Simulateion On Non-thermal Plasmas Flue Gas Denitrification

In the past decades flue gas denitrification is one of environmental problem which attracts worldwide attention. Japan MITI Committee evaluated the DeSOx/DeNOx technology by corona discharge and concluded that it deserves development as the next generation to be used in the utility boiler plants. To find the ways for improving this technique, one of the most important things is to explore the main fundamental reactions in denitrification by non-thermal plasmas. "However, the related fundamental reactions discovered up to now have appeared over hundreds. Therefore since years, main reaction mechanism mostly remained presumptions, which is not a very reliable judgment. Using CSTR (contineous-flow stirred-tank reactor) model, the chemical kinetic processof removal of NOx by nonthermal plasmas (electron beam or streamer corona) is calculated and analyzed. It is discovered that the fundamental reactions contributing over 1% total reaction rate in the gas flows with different compositions of N₂+NCK N₂+O₂+NOs N₂+O₂+H₂O+NCK N₂+ NH₃+NCK N₂+O₂+NH₃+NO and under the action of different plasma power are only a few. Therefore the results clearly reveal the main kinetic mechanism of non-thermal plasma denitrification of gases. CSTR model is adopted to simulate the chemical reaction processes in nonthermal plasma flue gas denitrification. It is principally proved that the effects on energy reduction due to SO₂and additional NH3 are not initiated by SO₂, but contributed by the externally additional NH3. Meanwhile the effect of temperature is also discussed. This work can serve as a theoretical reference for setting the nonthermal plasma flue gas denitrification stage and applying the ammonia reagent.