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INTERNATIONAL JOURNAL OF PHARMACEUTICAL RESEARCH

A Step Towards Excellence
Published by : Advanced Scientific Research
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0975-2366
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IJPR 9[3] July - September 2017 Special Issue

July - September 9[3] 2017

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Multi-stage fuel injection as a method to reduce toxic emissions of uprated medium-speed diesel engine

Author: V.A. RYZHOV
Abstract: Tightening of exhaust emission limits for diesel engines requires a continuous improvement of air-fuel mixing quality which is defined to a great extent by fuel injection process. According to the present domestic and foreign procedures evaluation of toxic emissions quantity is done in terms of integrated specific parameters. These are calculated on the basis of engine testing results obtained in a specified range of operation modes. The investigation results obtained for the operation process of uprated locomotive engine 12D49M (12CHN26/26 rated at 2200 kW) have shown prevailing of nitrogen oxides (NOx) in total toxic emissions in modes close to standard power. At partial loads CO emissions prevail. Thus, in the first case reduction of integrated toxic parameters can be achieved through measures aimed at decreasing NOx emissions (such as reduction of maximal cycle and local temperatures). In the second case measures reducing CO emissions (such as increase of actual cycle temperatures) are effective. Meanwhile it is known that the reduction of actual cycle temperatures results in a worse indicated efficiency of the engine and, consequently, in its worse fuel efficiency. To avoid this phenomenon correction of heat release phase with simultaneous reduction of cylinder pressure growth rate is necessary.
Keyword: medium-speed engine, injection, injection timing, operation process, exhaust parameters. The article deals with investigation results of single, two and three-stage fuel injection effect on operation process of up-rated medium-speed diesel engine intended for use in main-line locomotives. The aim of the study is to reduce toxic exhaust emissions. It has been shown that three-stage fuel injection is one of the most trade-off approaches permitting to reduce toxic exhaust emissions without essential reduction of specific fuel consumption.
DOI: https://doi.org/10.31838/ijpr/2020.12.03.215
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