Experimental study on the influence of the nitrogen concentration in the oxidizer on NOx and CO emissions during the oxy-fuel combustion of natural gas

Christian Gaber*, Christoph Schluckner, Philipp Wachter, Martin Demuth, Christoph Hochenauer

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In this research, the influence of the nitrogen concentration in the oxidizer, oxygen/fuel equivalence ratio and temperature of the combustion chamber on the combustion characteristics of a natural gas fired oxy-fuel jet burner was observed. The thermal input of the fuel was 600 kW and the nitrogen concentration in the oxidizer was varied between 0 and 15 vol.-%, wherein either the maximum combustion chamber temperature or the thermal output were held constant. It was observed that in case of a constant combustion temperature, even small volume fractions of nitrogen in the oxidizer resulted in non-negligible reductions in the thermal output. Furthermore, the experimental results showed that an increase in the nitrogen concentration from 0 to 15 vol.-% caused an approximately eight-fold increase in the NOx emissions and a considerable decrease in the CO emissions. The impact of the oxygen/fuel equivalence ratio on the NOx emissions was negligibly small up to a nitrogen concentration of 2 vol.-%. A reduction of the oxygen/fuel equivalence ratio to near stoichiometric levels resulted in NOx emission factors below 52 mg/kWh. The influence of the oxygen/fuel equivalence ratio on the NOx emissions was significantly more pronounced with an increasing amount of nitrogen present in the oxidizer.

Original languageEnglish
Article number118905
JournalEnergy
Volume214
DOIs
Publication statusPublished - 1 Jan 2021

Keywords

  • Natural gas, NO and CO emissions
  • Oxy-fuel combustion
  • Oxy-fuel jet burner
  • Semi-industrial combustion chamber

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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