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Diesel NO(x) aftertreatment by combined process using temperature swing adsorption, NO(x) reduction by nonthermal
Keiichiro Yoshida1, Takuya Kuwahara, Tomoyuki Kuroki
1Department of Electrical and Electronic Systems Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Osaka 535-8585, Japan. k.yoshida@ee.oit.ac.jp
Abstract:
NO(x) emitted from a stationary diesel engine generator was treated with a hybrid system comprising NO(x) reduction by nonthermal plasma (NTP) and temperature swing adsorption (TSA) driven by engine waste heat. TSA produces a low-volume gas mixture of N(2) and highly concentrated NO(x), which is effectively reduced by NTP treatment. Improved treatment performance and efficiency are achieved by re-injecting the NTP-treated gas mixture into the engine intake. The system comprises two switchable adsorption chambers; the operation of this system was simulated by using a one-chamber system. The maximum energy efficiency for NO(x) treatment is 200 g(NO(2))/kWh. The respective contributions of NTP and injection of N(2) and NO(x) to the performance were theoretically analyzed. The analysis predicts that high energy efficiency and high NO(x)-removal efficiency can be simultaneously achieved with this system but miniaturization of the adsorption chambers will be a challenge.
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