EFFECT OF PARTICULATES ON THE MEASUREMENT OF OXIDES OF NITROGEN IN DIESEL EXHAUST

Analysis was conducted to determine the extent of errors caused by nitrogen oxide (NOx) interaction with soot in diesel exhaust measurement systems. A simple model was developed to estimate the extent of NOx adsorption by soot. Model application to a production passenger car diesel engine tested with the Federal Test Procedure and using the constant volume sampling system indicated that NOx measurement errors attributable to adsorption by soot were negligible. Since experimental results suggested that the percentage of NOx adsorbed by soot suspended in the exhaust stream was a function of gas sample residence time, it was determined that a short sample line and a high flow rate will minimize measurement errors. Further research is recommended to explore chemical vs. physical adsorption and the interaction between soot and other gaseous components of engine exhaust.

• Supplemental Notes:
  • Also published in HS-029 113 (SAE-P-86), "Diesel Combustion and Emission," Warrendale, Pennsylvania, 1980 pp 165-75. Presented at SAE Congress and Exposition, Detroit, 25-29 February 1980.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Ahmad, T
• Publication Date: 1980

Media Info

• Features: References;
• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Adsorption; Diesel engines; Exhaust gases; Fly ash; Mathematical models; Nitric oxide; Nitrogen oxides; Particulates
• Uncontrolled Terms: Models; Soot
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00385657
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 800189, HS-029 128
• Files: HSL, USDOT
• Created Date: Jun 28 1984 12:00AM