MAJORIZATION OF WORKING PARAMETERS FOR NON-THERMAL PLASMA REACTOR AND IMPACT ON NO OXIDATION OF DIESEL ENGINE

다국어 초록 (Multilingual Abstract)

The main target of this work is to realize the function of pre-oxidizing NO from diesel engine’s exhaust by using self-designed double-dielectric Non-thermal Plasma (NTP) reactor. The majorized discharge frequency and discharge peak to peak voltage (Vp-p) range for NTP reactor were obtained through air discharge test. The diesel engine test bench was established to observe the effect of NTP on the volume fraction of NO. The results showed that there were more active substances and fewer by-products in NTP reactor when discharge frequency was 9 kHz and Vp-p was between 9 kV and 23 kV; Exhaust flows had insignificant effect on the performance of NTP pre-oxidizing NO; The ability of NTP to pre-oxidize NO gradually weakened with the increase of engine load, and when the engine load were 0 % and 25 %, the ratio of NO/NO2 could reach 1. In such working conditions, SCR system could improve the conversion rate of the NOx at low-temperature zone through quick reaction combined with NTP.

참고문헌 (Reference)

1 Tan Feng, "The characteristics of ammonia storage and the development of model-based control for diesel engine urea-SCR system" 한국공업화학회 28 : 97-109, 2015

2 Cho, B. K., "Selective catalytic reduction of NOx by diesel fuel: Plasma-assisted HC/SCR system" 191 (191): 20-24, 2012

3 Chen, Q., "Removing NOx emission from diesel engine with plasmaassisted NH3-SCR" 186 : 33-36, 2010

4 Ciardelli, C., "Reactivity of NO/NO2-NH3 SCR system for diesel exhaust aftertreatment: Identification of the reaction network as a function of temperature and NO2 feed content" 70 (70): 80-90, 2007

5 Mohamed, F., "Optimization strategies to reduce the biodiesel NOx effect in diesel engine with experimental verification" 68 : 96-104, 2013

6 Wang, Q., "Numerical simulation of diesel engine Urea-SCR system and its mixer structure optimization" 36 (36): 51-57, 2015

7 Xin, Z., "Influence factors of deNOx behavior in Urea-SCR catalytic converter of diesel" 42 (42): 30-34, 2011

8 Wang, W. T., "Increased NO2 concentration in the diesel engine exhaust for improved Ag/Al2O3 catalyst NH3-SCR activity" 270 : 582-589, 2015

9 Tran Quang Vinh, "Fundamental study of NOx removal from diesel exhaust gas by dielectric barrier discharge reactor" 대한기계학회 26 (26): 1921-1928, 2012

10 Chen, Z. B., "Experimental investigation of the performance and emissions of diesel engines by a novel emulsified diesel fuel" 95 : 334-341, 2015

11 Zheng, Q. P., "Effect of structure parameters of diesel engine Urea-SCR system on NOx conversion rate" 34 (34): 31-35, 2013

12 Yoshida, K., "Diesel NOx aftertreatment by combined process using temperature swing adsorption, NOx reduction by nonthermal plasma, and NOx recirculation: Improvement of the recirculation process" 231-232 : 18-25, 2012

13 Wang, J., "Conversion of NO in NO/O2/N2 system by dielectric barrier discharge plasmas" 67 (67): 2315-2318, 2009

14 Jolibois, J., "Application of a non-thermal surface plasma discharge in wet condition for gas exhaust treatment: NOx removal" 70 (70): 300-308, 2012

15 Liu, L. D., "A research of the effects of non-thermal plasma on the emission control of diesel engine" 8 (8): 116-120, 2013