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. 2021 Aug 27;18(17):9075.
doi: 10.3390/ijerph18179075.

Important Contributions to Reducing Nitrogen Oxide Emissions from Internal Combustion Engines

Daniela Laura Buruiana  1 , Adrian Sachelarie  2 , Claudiu Butnaru  2 , Viorica Ghisman  1
Affiliations

Important Contributions to Reducing Nitrogen Oxide Emissions from Internal Combustion Engines

Daniela Laura Buruiana et al. Int J Environ Res Public Health. .

Abstract

Nitrogen oxides are considered significant pollutants because of their effects on ecosystems and human health. The amount of NOx emitted by internal combustion engines can be reduced, mostly by acting on the conditions in which combustion takes place, respectively by lowering the peak flame temperature, reducing the excess of oxygen, etc. The homogeneous charge compression ignition (HCCI) engine represents a new technology that can simultaneously reduce NOx emissions and fuel consumption. This article presents these benefits of the HCCI engine by comparing the emissions and fuel consumption of a monocylinder engine when it is operated in a conventional way, with spark ignition, with those obtained when the engine is running in the HCCI mode. Moreover, since engine simulation has become an important tool for investigating the HCCI process and for developing new control strategies for it, this was used in this study to determine the effects of the exhaust gas recirculation on the combustion quality, respectively, on emissions.

Keywords: combustion dioxide; emissions; risks.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Experimental setup of the engine.
Figure 2
Figure 2
Indicated PV diagram for spark ignition operation mode.
Figure 3
Figure 3
Indicated PV diagram for HCCI combustion mode.
Figure 4
Figure 4
EGR ratio influence on temperature inside the cylinder.
Figure 5
Figure 5
EGR ratio influence on pressure inside the cylinder.
Figure 6
Figure 6
EGR ratio influence on N2 emissions.
Figure 7
Figure 7
EGR ratio influence on CO emissions.
Figure 8
Figure 8
EGR ratio influence on UHC emissions.
See this image and copyright information in PMC

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