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Control of oxides of nitrogen from diesel engines using diluents while minimising the impact on particulate pollutants

Ladommatos, N; Abdelhalim, S; Zhao, H; (1998) Control of oxides of nitrogen from diesel engines using diluents while minimising the impact on particulate pollutants. APPLIED THERMAL ENGINEERING , 18 (11) 963 - 980.

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Abstract

The investigation was conducted on a high-speed direct-injection diesel engine and was concerned with the effects of exhaust gas recirculation (EGR) on diesel engine combustion and emissions. In particular, the effects on combustion and emissions of carbon dioxide (CO2) and water vapour (H2O), principal constituents of EGR, were analysed and quantified experimentally. The effects of increased inlet temperature and thermal throttling of the inlet charge, both arising from the use of hot EGR, were also investigated. Finally, tests were carried out during which the CO2 added to the engine air flow increased the charge mass flow rate to the engine, rather than displacing some of the oxygen (O-2) in the inlet air. It was found that when CO2 or H2O displaced O-2 in the inlet charge, both the chemical and thermal effects on exhaust emissions were small. However, the dilution effect was substantial, and resulted in very large reductions in exhaust NOx at the expense of higher particulate and unburnt hydrocarbon emissions. Higher inlet charge temperature increased exhaust NOx and particulate emissions, but reduced unburnt hydrocarbon emissions. Reduction in the inlet charge due to thermal throttling reduces NOx emissions but raises all the other pollutants. Finally, when CO2 was additional to the inlet air charge (rather than displacing O-2), large reductions in NOx were recorded with little increase in particulate emissions. (C) 1998 Elsevier Science Ltd. All rights reserved.

Type: Article
Title: Control of oxides of nitrogen from diesel engines using diluents while minimising the impact on particulate pollutants
Location: LIMASSOL, CYPRUS
Keywords: diesel combustion, exhaust gas recirculation, diesel pollutant emissions
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/138454
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