A numerical and experimental investigation into the anomalous slight NOx increase when burning biodiesel; A new (old) theory

G. Ban-Weiss, R. Gupta, J. Y. Chen, Robert Dibble

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Diesel engines are widely used in the transportation and power generation sectors because of their high fuel efficiency. However, they are responsible for a significant portion of atmospheric oxides of nitrogen and particulate matter, and most run on petroleum derived No. 2 diesel fuel, which is steadily increasing in price. Biodiesel is a notable alternative to diesel fuel because it comes from natural sources, it is essentially carbon dioxide neutral, and it lowers an engine's emission of most pollutants as compared to No. 2 diesel. However, the use of biodiesel often slightly increases a diesel engine's emission of nitrogen oxides (NOx). In this paper, previously proposed theories for this slight NOx increase are reviewed, including theories based on biodiesel's cetane number, which leads to differing amounts of charge preheating, and theories based on the fuel's bulk modulus, which affects injection timing. This paper proposes a new theory explaining this NOx increase; the increase in double bonds in biodiesel, compared to No. 2 diesel, increases its flame temperature, which in turn increases NOx. Numerical simulations found that NOx was predominantly due to the Zeldovich mechanism.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Western States Section of the Combustion Institute 2005, WSS/CI 2005 Fall Meeting
PublisherWestern States Section/Combustion Institute
Pages1309-1356
Number of pages48
ISBN (Electronic)9781617827921
StatePublished - Jan 1 2005
EventFall Technical Meeting of the Western States Section of the Combustion Institute 2005, WSS/CI 2005 - Stanford, United States
Duration: Oct 17 2005Oct 18 2005

Publication series

NameFall Technical Meeting of the Western States Section of the Combustion Institute 2005, WSS/CI 2005 Fall Meeting
Volume2

Other

OtherFall Technical Meeting of the Western States Section of the Combustion Institute 2005, WSS/CI 2005
CountryUnited States
CityStanford
Period10/17/0510/18/05

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

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