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为了实现对柴油机NOX和碳烟同步去除,采用柠檬酸络合法制备了一种La0.4Ce0.6Cu0.2Mn0.8O3/HZSM-5催化剂;协同低温等离子体(non-thermal plasma,NTP)发生器,建立了低温等离子体辅助催化(NPAC)系统。通过发动机台架试验,研究了NPAC技术对柴油机碳烟和NOX转化规律,分析了NTP输入电压、排气温度和催化剂活性对碳烟和NOX转化效果的影响。结果表明:当输入电压为7.5kV时,NPAC技术对柴油机低负荷的碳烟转化率较低,这主要是单位碳烟微粒电荷量和催化剂活性不强造成的;当输入电压为10kV时,NPAC技术对柴油机高负荷的碳烟和NOX转化率最好,这主要是在标定转速下,排气温度较高,使La0.4Ce0.6Cu0.2Mn0.8O3/HZSM-5催化剂活性增强。
In order to achieve simultaneous removal of diesel NOX and soot, a La0.4Ce0.6Cu0.2Mn0.8O3 / HZSM-5 catalyst was prepared by the citrate complexation method. In conjunction with a non-thermal plasma (NTP) generator , A low temperature plasma assisted catalysis (NPAC) system was established. Through the engine bench test, the conversion rule of soot and NOX of diesel engine by NPAC technology was studied. The influence of NTP input voltage, exhaust temperature and catalyst activity on soot and NOX conversion was analyzed. The results show that when the input voltage is 7.5kV, the conversion rate of NPAC to diesel under low load is low, which is mainly caused by the low charge per unit soot particle and poor catalyst activity. When the input voltage is 10kV, NPAC The technology has the best conversion rate of high-load soot and NOX for diesel engines, which is mainly due to the higher exhaust temperature at the calibration speed and the activity of La0.4Ce0.6Cu0.2Mn0.8O3 / HZSM-5 catalyst.