Abstract
Non-thermal plasma (NTP) has been introduced over the last few years as a promising after- treatment system for nitrogen oxides and particulate matter removal from diesel exhaust. NTP technology has not been commercialised as yet, due to its high rate of energy consumption. Therefore, it is important to seek out new methods to improve NTP performance. Residence time is a crucial parameter in engine exhaust emissions treatment. In this paper, different electrode shapes are analysed and the corresponding residence time and NOx removal efficiency are studied. An axisymmetric laminar model is used for obtaining residence time distribution numerically using FLUENT software. If the mean residence time in a NTP plasma reactor increases, there will be a corresponding increase in the reaction time and consequently the pollutant removal efficiency increases. Three different screw thread electrodes and a rod electrode are examined. The results show the advantage of screw thread electrodes in comparison with the rod electrode. Furthermore, between the screw thread electrodes, the electrode with the thread width of 1 mm has the highest NOx removal due to higher residence time and a greater number of micro-discharges. The results show that the residence time of the screw thread electrode with a thread width of 1 mm is 21% more than for the rod electrode.
Highlights
Non-thermal plasma (NTP) technology is known as a reasonably new pollution reduction method [1]
NTP treatment of exhaust gases is effective for emission reduction through introducing plasma inside the exhaust gases
To make sure that the resulting solution is grid independent, CFD simulations of the velocity distribution and the mean residence time are evaluated for different computational grid sizes for the screw electrode with 1 mm gap between the threads
Summary
Non-thermal plasma (NTP) technology is known as a reasonably new pollution reduction method [1]. Polluted exhaust gas undergoes chemical changes when exposed to plasma.
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