Title: Diesel NOx reduction with ammonium deoxidizing agents directly injected into the cylinder

Authors: N. Miyamoto, H. Ogawa, J. Wang, T. Shudo, K. Yamazaki

Addresses: Department of Mechanical Engineering, Hokkaido University, N-13, W-8, Kitaku, Sapporo, Hokkaido 060, Japan. ' Department of Mechanical Engineering, Hokkaido University, N-13, W-8, Kitaku, Sapporo, Hokkaido 060, Japan. ' Department of Mechanical Engineering, Hokkaido University, N-13, W-8, Kitaku, Sapporo, Hokkaido 060, Japan. ' Department of Mechanical Engineering, Hokkaido University, N-13, W-8, Kitaku, Sapporo, Hokkaido 060, Japan. ' Department of Mechanical Engineering, Hokkaido University, N-13, W-8, Kitaku, Sapporo, Hokkaido 060, Japan

Abstract: The effect of ammonium deoxidizing agents on reductions in NOx emitted from a diesel engine was examined. Ammonium compounds dissolved in water were injected directly into the cylinder during the expansion stroke. The results showed that NOx emissions could be successfully reduced by 60% by optimizing the injection timings and the amount of injected agents. Ammonia concentration in the exhaust gas was less than 10 ppm even when an excess amount of agents was injected. The NOx deoxidizing processes were described by a chemical kinetics model with the elementary reactions.

Keywords: ammonium deoxidizing agents; diesel engines; NOx reduction; nitrogen oxides; emissions reduction; direct injection; engine emissions; vehicle emissions; NOx emissions; injection timing; exhaust gas; chemical kinetics; kinetic modelling.

DOI: 10.1504/IJVD.1995.061957

International Journal of Vehicle Design, 1995 Vol.16 No.1, pp.71 - 79

Available online: 28 May 2014 *

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