NO emissions in oxy-coal combustion with the addition of steam in an entrained flow reactor

Lucía Álvarez, Juan Riaza, María V. Gil, Covadonga Pevida, José J. Pis, Fernando Rubiera*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The NO emissions of a semi-anthracite and a high-volatile bituminous coal were studied under oxy-fuel combustion conditions in an entrained fl ow reactor (EFR). The results obtained under oxy-fuel atmospheres (21%O2-79%CO 2, 30%O 2-70%CO 2 and 35%O 2-65%CO 2), were compared with those produced in air. The replacement of CO 2 by 5, 10, and 20% of steam in the oxy-fuel combustion atmospheres was also evaluated in order to study the wet recirculation of fl ue gas. The NO emissions during oxy-fuel combustion were lower than those in air-fi ring, and a slight increasing trend in NO emissions was observed as O 2 concentrations in the oxy-fuel atmospheres increased. Similarly, the NO concentration was reduced by the addition of steam, both under air and under oxy-fuel atmospheres, but no relevant differences between the different steam concentrations were observed.

Original languageEnglish
Pages (from-to)180-190
Number of pages11
JournalGreenhouse Gases: Science and Technology
Volume1
Issue number2
DOIs
Publication statusPublished - 1 Jun 2011

Keywords

  • Entrained flow reactor
  • NO emissions
  • Oxy-fuel combustion
  • Pulverized coal
  • Steam addition

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