| HEAT EXCHANGER/CATALYTIC SYSTEM FOR REDUCING THE EXHAUST EMISSIONS FROM DIESEL ENGINES |
| J. LUCAS, M. A. HOUGHTON, I. G. MASHETER |
| University of Liverpool |
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| ABSTRACT |
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A system has been researched over the past 3 years for reducing the exhaust pollutants from diesel engines for light commercial vehicles. The system researched achieves Euro 6 standards for reduction of polluting gases (CO, HC, PM, NO). It consists of 4 main sections: 1. A heater and heat exchanger (HE); 2. A CO/HC oxidising catalyst (DOC); 3. Pt catalyst on a diesel particulate filter (DPF); 4. A NO reducing reaction (SCR) within the DPF. The system operates as follows. The exhaust gas contains oxidising gases, namely both O2 and NO2. The levels of CO and HC are oxidised by O2 to CO2 for temperatures above 200oC. Carbon (PM) is oxidised to CO2 by NO2 but requires a temperature above 250oC. The operating exhaust temperature of 300oC is ideal for the removal of NO by using the Pt catalyst and the CO generated within the DPF. The heater is required to be able to raise the exhaust temperature at any time to 300 |
| Key Words:
Exhaust emission control, Heat exchanger design, Light – duty diesel euro emission standards and test cycle |
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