An on-line method for determining flame ionization detector effective response factor of hydrocarbons from combustion sources

A. Avenido, G. Lucachick, William Northrop

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The industry standard for measuring total exhaust hydrocarbons (HCs) in internal combustion engine exhaust is the flame ionization detector (FID); however, oxygenated HCs like those found in biodiesel or ethanol have reduced FID response and thus their true concentration is not accurately measured by conventional analyzers. This paper presents a new method to determine the response factor for the measurement of exhaust hydrocarbons using sample conditioning in combination with an analytical method. A custom designed variable temperature sample conditioner was designed and built and two fast FIDs were used determine the condensable fraction of hydrocarbons present in engine exhaust over a range of sample temperature. A correction model was developed to compensate for water condensing from the exhaust, nitrogen and carbon dioxide dissolving in the condensing water, and reduced response factor for HCs in the presence of water vapor. A theoretical model was developed to predict the condensation of unburned biodiesel as a function of temperature using a fatty acid profile of the fuel and Antoines equation for species vapor pressure. This model was used to estimate a relative response factor of 0.65 for unburned HCs in exhaust from a diesel engine operating on 100% biodiesel.

Original languageEnglish (US)
Title of host publicationWestern States Section of the Combustion Institute Spring Technical Meeting 2014
PublisherWestern States Section/Combustion Institute
Pages250-259
Number of pages10
ISBN (Electronic)9781632665218
StatePublished - Jan 1 2014
EventWestern States Section of the Combustion Institute Spring Technical Meeting 2014 - Pasadena, United States
Duration: Mar 24 2014Mar 25 2014

Publication series

NameWestern States Section of the Combustion Institute Spring Technical Meeting 2014

Other

OtherWestern States Section of the Combustion Institute Spring Technical Meeting 2014
CountryUnited States
CityPasadena
Period3/24/143/25/14

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