CFD simulation of a low nox oil fired boiler

C. Hochenauer*, G. Brandstetter

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


This paper compares the results of an advanced CFD calculation with measurements of a heavy fuel oil fired low NOx boiler. First, a state of the art boiler was investigated and the impact of boiler load and excess air on the NOx emissions was measured. In a second test run a staged combustion technology was integrated using the over fire air concept. The over fire technology is well known and well tested in coal fired boilers. In this pilot boiler it was shown that the over fire air technology could be used for oil fired boilers, too - leading to an enormous NOx reduction without any increase in CO and soot emissions. It was shown that the influence of boiler load, excess air and over fire air on the NOx and CO emissions can be predicted very well in the CFD calculation. Detailed numerical investigations showed that two-phase effects, a good turbulence model, gas and soot radiation and a detailed chemical kinetics mechanism are a must when modeling (staged) heavy oil combustion. The results of the CFD calculation showed an excellent agreement with the measurements over a very wide range of boiler settings and load factors although NOx is extremely difficult to predict.

Original languageEnglish
Number of pages10
Publication statusPublished - 23 Nov 2005
EventASME Turbo Expo 2005: Gas Turbie Technology: Focus for the Future - Reno-Tahoe, United States
Duration: 6 Jun 20059 Jun 2005


ConferenceASME Turbo Expo 2005
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Engineering(all)

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