Exhaust Gas Characteristics According to the Injection Conditions in Diesel and DME Engines

Seamoon Yang,Changhee Lee

doi:10.3390/app9040647

Seamoon Yang, Changhee Lee

Open Access

https://doi.org/10.3390/app9040647

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Journal: Applied Sciences	Publication Date: Feb 14, 2019
Citations: 8	License type: CC BY 4.0

Affiliation: Chosun University, Pukyong National University

Abstract

In this paper, the effect of high-pressure injection pressure on particulate matter (PM) and nitrogen oxide (NOx) emissions is discussed. Many studies have been conducted by active researchers on high-pressure engines; however, the problem of reducing PM and NOx emissions is still not solved. Therefore, in the existing diesel (compression ignition) engines, the common rail high-pressure injection system has limitations in reducing PM and NOx emissions. Accordingly, to solve the exhaust gas emission problem of a compression ignition engine, a compression ignition engine using an alternative fuel is discussed. This study was conducted to optimize the dimethyl ether (DME) engine system, which can satisfy the emission gas exhaust requirements that cannot be satisfied by the current common rail diesel compression ignition engine in terms of efficiency and exhaust gas using DME common rail compression ignition engine. Based on the results of this study on diesel and DME engines under common rail conditions, the changes in engine performance and emission characteristics of exhaust gases with respect to the injection pressure and injection rate were examined. The emission characteristics of NOx, hydrocarbons, and carbon monoxide (CO) emissions were affected by the injection pressure of pilot injection. Under these conditions, the exhaust gas characteristics were optimized when the pilot injection period and needle lift were varied.

Highlights

In order to prevent air pollution caused by exhaust gas from automobiles, exhaust emission regulations such as Tier-III and EURO-VI have been announced in various countries such as USA, Europe and Japan
As the injection pressure increased, the amount of nitrogen oxide (NOx) increased, and pilot injection showed that the diesel could be reduced to 20% (100 ppm) and dimethyl ether (DME) to 10% (50 ppm)
Based on the results of this study on diesel and DME engines with common rail conditions applied, we examined the engine performance changes and emission characteristics of exhaust gases

Summary

Introduction

In order to prevent air pollution caused by exhaust gas from automobiles, exhaust emission regulations such as Tier-III and EURO-VI have been announced in various countries such as USA, Europe and Japan. Diesel engines have been widely used as power sources for automobiles and ships because of their high thermal efficiency and fuel efficiency. It has the advantage of low carbon monoxide (CO) and unburned hydrocarbons (HC). Because it burns under lean conditions where the fuel consumption rate is lower than that of the gasoline engine and the combustion state is excess oxygen. Since it has the disadvantage of high PM (particulate matter) and NOx (nitrogen oxides) emissions, it cannot satisfy the increasingly stringent emission regulations [2,3].

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Results

Conclusion