Comprehensive evaluation of oxidation efficiency and energy efficiency of NO oxidation process in DBD reactor
The effects of reactant concentration(O2 and NO),process parameters(discharge power and gas flow rate),key discharge indicators(average electron energy,average electron density,and energy density), and flue gas components(H2O and SO2) on the reaction performance were systematically studied by using a double-dielectric coaxial dielectric barrier discharge(DBD) reactor. By introducing a weighted composite index,the combined performance of oxidation efficiency and energy efficiency was evaluated and the optimal combination of reactant concentrations(0. 02％ of NO and 6％ of O2 ) was determined. The results showed that lower discharge power 40 W and lower gas flow rate (1. 5 L/ min) can lead to higher oxidation efficiency and energy efficiency,and the optimal oxidation efficiency can reach 68％. The changes in discharge power and gas flow rate have a great influence on energy density(SED). Higher SED will lead to the occurrence of the reverse reaction,while lower SED will lead to the difficulty of NO oxidation reaction,and the optimal SED range is between 480 J/ L and 610 J/ L. The above two process parameters have almost no effect on the average electron energy(Ee) and the average electron density(ne). The addition of H2O can promote the oxidation of NO,and the increase in efficiency can reach 6％,while the addition of SO2 can inhibit the oxidation of NO. This work can provide the most basic reference for the design and optimization of the process of NO oxidation through a DBD reactor.
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维普
