Oxides of Nitrogen in Diesel Engine Exhaust Gas: Their Formation and Control

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Abstract
Interest in the emission of oxides of nitrogen in diesel engine exhaust gas stems largely from the air pollution problem which arises when diesel engines are operated in confined spaces. The author describes tests which have been carried out at the B.P. Research Centre, when oxides of nitrogen concentrations were measured on three engine types over a range of operating conditions. Based on the results of these tests, a theory is presented for the formation of nitrogen oxides in the engine cylinder, and general principles are laid down for their control. The author concludes with recommendations concerning choice of engine type and operating conditions to ensure a minimum discharge of nitrogen oxides.

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