Abstract
In this paper, an experimental setup was established to study the influence of potassium chloride (KCL) solution as the ground electrode on the nitrogen oxides (NOx) removal efficiency in non-thermal plasma (NTP) generated by dielectric barrier discharging (DBD) reactor. The experimental results show that the KCL solution as the ground electrode has better stability and higher discharge intensity and it is a promising approach to improve NOx removal efficiency. The specific NOx removal efficiency is related to the power frequency, the concentration and temperature of the KCL solution. As the power frequency increases, the NOx removal efficiency first increases and then decreases, and a maximum value is reached at the power frequency of 8 kHz. The NO removal effect is improved as the concentration of the KCL solution increases, especially when the concentration is lower than 0.1 mol/L. Under the same KCL solution concentration and input energy density, the NOx removal efficiency is increased with the solution temperature. In particular, when the power discharge frequency is 8 kHz, the KCL solution concentration is 0.1 mol/L and the solution temperature is 60 °C, the NOx and NO removal efficiency reach 85.82% and 100%, respectively.
Highlights
Nitrogen oxides (NOx), as one of the main air pollutants, is mainly produced from the combustion of fossil fuels in human activities, of which industrial emissions and transportation emissions account for the largest proportion [1]
Chen [12] studied the structural characteristics of the dielectric barrier discharge (DBD) reactor, and the results showed that the overall removal effect of the coaxial cylindrical reactor was better than that of the flat plate, and the glass medium material had a better effect than mica
The results showed that the discharges of the three-electrode materials were all filamentary discharges, and the discharge effect of pure water was the weakest. It can be indicated from the above researches that the discharge effect of the DBD and the removal efficiency of NOx are severely affected by the structure of the reactor, the dielectric material, and the electrode material
Summary
Nitrogen oxides (NOx), as one of the main air pollutants, is mainly produced from the combustion of fossil fuels in human activities, of which industrial emissions and transportation emissions account for the largest proportion [1]. The results showed that the discharges of the three-electrode materials were all filamentary discharges, and the discharge effect of pure water was the weakest It can be indicated from the above researches that the discharge effect of the DBD and the removal efficiency of NOx are severely affected by the structure of the reactor, the dielectric material, and the electrode material. The metal mesh electrode is prone to be not compact when it is arranged In response to these problems, this paper proposes a DBD reactor using a coaxial cylindrical stainlesssteel rod as the high-voltage electrode and KCL solution as the ground electrode for NOx removal. An experimental setup was established to study the influence of KCL solution as the ground electrode on the NOx removal of dielectric barrier discharge non-thermal plasma.
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