Effects of EGR rate on performance and emissions of a diesel power generator fueled by B7

José Ricardo Sodré*, Domenico De Serio, Alex de Oliveira

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper analyses the impacts of the application of an exhaust gas recirculation (EGR) system on the performance and emissions of a stationary, direct-injection diesel engine operating with diesel oil containing 7% biodiesel (B7). Experiments were carried out in a 49-kW diesel power generator with the adapted EGR system, and engine performance and emissions were evaluated for different load and EGR settings. The results were compared with the engine operating with its original configuration without the EGR system, and revealed a reduction of peak cylinder pressure and fuel conversion efficiency, mainly at high engine loads. The use of EGR caused opposite effects on carbon dioxide (CO2), carbon monoxide (CO) and total hydrocarbons (THC) emissions, depending on load and EGR rate, showing an increase in most situations. The application of EGR consistently reduced oxides of nitrogen (NOX) emissions, reaching a maximum reduction close to 30%. In general, the use of EGR increased CO2, CO and THC emissions at high loads. The use of 7.5% EGR was found to be at an adequate rate to simultaneously reduce CO, THC and NOX emissions at low and moderate loads, without major penalties on CO2 emissions and engine performance.

Original languageEnglish
Pages (from-to)1919-1927
Number of pages9
JournalJournal of the Brazilian Society of Mechanical Sciences and Engineering
Issue number6
Early online date3 Apr 2017
Publication statusPublished - 1 Jun 2017

Bibliographical note

© The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.


  • Diesel engine
  • Emissions
  • Exhaust gas recirculation
  • Fuel conversion efficiency
  • Power generation


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