A Study of the Effects of Exhaust Gas Recirculation on Heavy-Duty Diesel Engine Emissions

Kreso, Admir M.; Johnson, John H.; Gratz, Linda D.; Bagley, Susan T.; Leddy, David G.

doi:10.4271/981422

Cited by 71 publications

(30 citation statements)

References 9 publications

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“…As a result, further investigations have been published concerning the effect of some injection strategies on particle size distribution (Desantes et al 2006;Baumgard and Johnson 1996;Kreso et al 1998;Bertola et al 2001). Several hypotheses have been formulated to explain the increased number of particles observed in new diesel engines, and it is thought that there are two major causes: a higher concentration of volatile nanoparticle precursors (HC, SO 2 ), and a decrease in mass of accumulation mode particles.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study of Particle Size Distributions with the Use of PostInjection Strategies in DI Diesel Engines

Desantes

Bermúdez

García

et al. 2011

Aerosol Science and Technology

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Control strategies such as variations in injection pressure and timing have been used by researchers to reduce in-cylinder exhaust emissions and meet legislation standards. Postinjection has been studied for several years and is now well known as an efficient strategy for reducing soot emission. Diesel gaseous and particle mass emissions have been progressively reduced over the last twenty years as a consequence of increasingly restrictive emission legislation and the application of aftertreatment devices. The main objective of this work is to better understand the effect of postinjection on particle size distribution in diesel exhaust. The approach uses a modern, well-instrumented research engine test cell equipped with a flexible high pressure fuel injection system. The results of this work provide guidelines for developing strategies to reduce particle size distribution in diesel engines. A major improvement in particle size distribution was found in the accumulation mode by using a close postinjection of a small quantity of fuel. For reduction in nucleation mode, a relationship was found with close postinjections of large quantities of fuel.

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Section: Introductionmentioning

confidence: 99%

A Comprehensive Study of Particle Size Distributions with the Use of PostInjection Strategies in DI Diesel Engines

Desantes

Bermúdez

García

et al. 2011

Aerosol Science and Technology

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“…Several acidic exhaust gas components are reported to condense potentially, such as sulfuric and nitric acid as well as organic acids (acetic, formic, butanoic acid). Among these, sulfuric acid turns out to be the most critical in regard to the dew point and the corrosivity of the exhaust gas [4,5,6]. There are several empirical correlations in the literature to determine the dew point of exhaust gases as a function of humidity and sulfuric acid content [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Condensation-Fouling Interaction in Low-Temperature EGR-Coolers

Reißig

Hoppe

Buchholz

et al. 2014

MATEC Web of Conferences

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EGR cooling is a worthwhile technology capable of reducing NOx-emissions and increasing the efficiency of CI engines. Challenges arise when low-temperature cooling is applied with high fuel sulfur contents. The resulting sulfuric acid condenses in conjunction with the water of the exhaust gas and gives rise to corrosion of coolers and engine components. Additionally, fouling of the EGR cooler is exacerbated by the condensation of acidic components compromising EGR performance. In order to gain a better understanding of the underlying processes a combined experimental and model-based approach is presented. Tests of two different EGR-cooler concepts under various conditions showed a strong influence of the fuel sulfur content on fouling and condensation. The one-dimensional cooler model developed alongside these experiments consists of an activity coefficient model (NRTL) of the binary system water -sulfuric acid and a condensation model that allows for simulating the coupled condensation of both vapor components. Comparison of experimental fouling and simulated condensation results show good agreement in interpreting critical fouling phenomena that occur at temperatures in between the acid-water dew point and the dew point of pure water.

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“…However, high flame temperatures predominate because locally stoichiometric air-fuel ratios prevail in such heterogeneous combustion processes [11]. Consequently, Diesel engine combustion generates large amounts of NOx because of the high flame temperature in the presence of abundant oxygen and nitrogen [6,7]. NOx comprise of nitric oxide (NO) and nitrogen dioxide (NO 2 ) and both are considered to be deleterious to humans as well as environmental health.…”

Section: Introductionmentioning

confidence: 99%

Combine Effect of Exhaust Gas Recirculation (EGR) and Varying Inlet Air Pressure on Performance and Emission of Diesel Engine

Rathod¹

2013

IOSR-JMCE

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A Study of the Effects of Exhaust Gas Recirculation on Heavy-Duty Diesel Engine Emissions

Cited by 71 publications

References 9 publications

A Comprehensive Study of Particle Size Distributions with the Use of PostInjection Strategies in DI Diesel Engines

A Comprehensive Study of Particle Size Distributions with the Use of PostInjection Strategies in DI Diesel Engines

Condensation-Fouling Interaction in Low-Temperature EGR-Coolers

Combine Effect of Exhaust Gas Recirculation (EGR) and Varying Inlet Air Pressure on Performance and Emission of Diesel Engine

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