Reactor Structure Optimization And Reaction Kinetics Research Of Desulfuration And Denitration By Plasma

From the point of view to improve the DeSO2/NOx efficiency and decrease the energy consumption, the optimization for pulsed discharge reactor structure, the simulation of non-thermal plasma chemical kinetics and mechanism analysis are mainly discussed in this paper and described in detail as following:By analyzing the difference between wire-plate corona discharge reactor and wire-plate dielectric barrier discharge (DBD) reactor, we found that the discharge electric field can be enhanced with wire-plate DBD reactor. On the basis of analyzing the mechanism of pulsed streamer discharge, the electric field distributions of the wire-plate DBD reactor under different electrode configuration have been calculated by numerical simulation and the electrode configuration has been optimized by combining the static electric field conditions for streamer corona forming, developing and propagating. The results show that the optimized wire-to-wire spacing is 1.1-2.0 times the wire-to-plate spacing.A simplified model was built to describe the desulfuration and denitration process by corona discharge plasma. RosenBrock method is used to simulate the DeSO2/NOx process in different mixed gas: (1)By comparing two different dynamics models in NO/N2, the N atom was found to control the NO conversion and the N2(A) controls the N2O conversion, 100% removal efficiency of NO was obtained. (2)In NO/SO2/N2/O2 gas streams, the rate constant has huge influence on the oxidation process of SO2 without O2, large rate constant was more efficient for removal of SO2, SO2 cannot be oxidized in dry air with high concentration of O2. (3)In NO/N2/O2/H2O gas streams, more than 80% removal efficiency of NO was obtained, 50% by oxidation process and 30.5% by reduction process, the energy consumption was about 80mJ/ppm(NO). (4)The effect of pulse frequency and concentration of H2O on the removal efficiency of NO were analyzed, the NO removal efficiency increased with increasing pulse frequency and increasing the concentration of H2O. An experimental system was established, the characteristics and mechanism of DeSO2 and DeNO in dry gas stream (NO/SO2/N2/O2) using non-thermal plasma were experimentally investigated. The comparison experiments were carried out in the dry gas stream with Ar and without Ar respectively, and O2 concentration is 0.1%. The comparison experimental results show that NO can be removed remarkably and its removal will be enhanced when there is Ar in the dry gas stream. It seems that SO2 can not be removed unless there is Ar in the dry gas stream.