A DBD-type （dielectric barrier discharge） NTP （non-thermal plasma） reactor was designed and an experimental system was established, in order to study the mechanism of plasma chemistry reactions in a gas mixture of...A DBD-type （dielectric barrier discharge） NTP （non-thermal plasma） reactor was designed and an experimental system was established, in order to study the mechanism of plasma chemistry reactions in a gas mixture of C3H6/NO/O2/N2. This paper is focused on a. the effects of the initial concentrations of both NO and 02 upon NO conversion rate and the variations of NOx and 03 concentrations versus SED （specific energy density） when mixed gases of NO/O2/N2 passed the NTP reactor; b. the effects of the initial concentration of C3H6 upon NO oxidation and reduction reactions in mixed gases of NO/N2/CaH6 and NO/N2/O2/C3H6. The conclusions drawn are as follows, a. When the mixed gases of NO/O2/N2 passed the NTP reactor, NO was simultaneously involved in oxidation and reduction reactions with the former dominant and NO2 concentration increased at the NTP reactor outlet. The NO conversion rate decreased with the increase of the initial concentration of NO and 02, the O3 concentration firstly increased and then decreased with the increase in SED value, b. NO reduction reaction was very weak and energy consumption was very high in a mixed gases of NO/N2. However, when C3H6 was added, the NO conversion rate was significantly increased. When 63H6 was added to the mixed gases of NO/O2/N2, the NO conversion rate was significantly increased and the energy consumption was considerably reduced.展开更多
为研究不同海拔下SCR系统性能,分别在80、90、100 k Pa大气压力下对一台满足国五排放标准的高压共轨柴油机进行性能与排放试验,以研究排气温度、排气流量和海拔变化对NO_(x)转化率和NH_(3)泄漏量的影响。结果表明:在排气流量为350 kg/h...为研究不同海拔下SCR系统性能,分别在80、90、100 k Pa大气压力下对一台满足国五排放标准的高压共轨柴油机进行性能与排放试验,以研究排气温度、排气流量和海拔变化对NO_(x)转化率和NH_(3)泄漏量的影响。结果表明:在排气流量为350 kg/h情况下,NO_(x)转化率随排气温度升高呈现先增后减的趋势,不同温度下NO_(x)转化率最大差值为43.4百分点;NH_(3)泄漏量随着温度的升高大体上呈下降趋势,不同温度下NH_(3)泄漏量最大差值为328×10^(-6);NO_(x)转化率随排气流量升高呈现先增后减的趋势,在250℃时,不同排气流量下NO_(x)转化效率最大相差21.5百分点;NH_(3)泄漏量随排气流量的增大而增加,在250℃时,不同排气流量下NH_(3)泄漏量最大差值为90.8×10^(-6)。相同工况下,海拔越高,NO_(x)转化率越高,NH_(3)泄漏量越小,大气压力为80和100 k Pa下NO_(x)转化率最大相差20.1百分点,NH_(3)泄漏量最大相差54.6×10^(-6)。展开更多
基金supported by National Natural Science Foundation of China (No.50776041)Provincial Science Foundation of Jiangsu of China (BK2008225) Scientific Research Foundation project of Jiangsu University of China (10JDG051)
文摘A DBD-type （dielectric barrier discharge） NTP （non-thermal plasma） reactor was designed and an experimental system was established, in order to study the mechanism of plasma chemistry reactions in a gas mixture of C3H6/NO/O2/N2. This paper is focused on a. the effects of the initial concentrations of both NO and 02 upon NO conversion rate and the variations of NOx and 03 concentrations versus SED （specific energy density） when mixed gases of NO/O2/N2 passed the NTP reactor; b. the effects of the initial concentration of C3H6 upon NO oxidation and reduction reactions in mixed gases of NO/N2/CaH6 and NO/N2/O2/C3H6. The conclusions drawn are as follows, a. When the mixed gases of NO/O2/N2 passed the NTP reactor, NO was simultaneously involved in oxidation and reduction reactions with the former dominant and NO2 concentration increased at the NTP reactor outlet. The NO conversion rate decreased with the increase of the initial concentration of NO and 02, the O3 concentration firstly increased and then decreased with the increase in SED value, b. NO reduction reaction was very weak and energy consumption was very high in a mixed gases of NO/N2. However, when C3H6 was added, the NO conversion rate was significantly increased. When 63H6 was added to the mixed gases of NO/O2/N2, the NO conversion rate was significantly increased and the energy consumption was considerably reduced.
文摘为研究不同海拔下SCR系统性能,分别在80、90、100 k Pa大气压力下对一台满足国五排放标准的高压共轨柴油机进行性能与排放试验,以研究排气温度、排气流量和海拔变化对NO_(x)转化率和NH_(3)泄漏量的影响。结果表明:在排气流量为350 kg/h情况下,NO_(x)转化率随排气温度升高呈现先增后减的趋势,不同温度下NO_(x)转化率最大差值为43.4百分点;NH_(3)泄漏量随着温度的升高大体上呈下降趋势,不同温度下NH_(3)泄漏量最大差值为328×10^(-6);NO_(x)转化率随排气流量升高呈现先增后减的趋势,在250℃时,不同排气流量下NO_(x)转化效率最大相差21.5百分点;NH_(3)泄漏量随排气流量的增大而增加,在250℃时,不同排气流量下NH_(3)泄漏量最大差值为90.8×10^(-6)。相同工况下,海拔越高,NO_(x)转化率越高,NH_(3)泄漏量越小,大气压力为80和100 k Pa下NO_(x)转化率最大相差20.1百分点,NH_(3)泄漏量最大相差54.6×10^(-6)。
