0
Research Papers: Fuel Combustion

Oxygen Enriched Air Effects on Combustion, Emission, and Distributed Reaction

[+] Author and Article Information
Ahmed O. Said

Department of Mechanical Engineering,
University of Maryland,
2181 Glenn L. Martin Hall, Bldg., #88,
College Park, MD 20742
e-mail: aosaid@umd.edu

Ashwani K. Gupta

ASME Fellow
AIAA
SAE
Distinguished University Professor
Department of Mechanical Engineering,
University of Maryland,
2159 Glenn L. Martin Hall, Bldg. #88,
College Park, MD 20742
e-mail: akgupta@umd.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received February 11, 2015; final manuscript received February 16, 2015; published online May 8, 2015. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 137(4), 042203 (Jul 01, 2015) (6 pages) Paper No: JERT-15-1058; doi: 10.1115/1.4030400 History: Received February 11, 2015; Revised February 16, 2015; Online May 08, 2015

A novel combustion technology which combines colorless distributed combustion (CDC) and oxygen enriched combustion (OEC) air is examined to achieve optimum benefits of both technologies and to foster novel technologies for cleaner environment. The influence of oxygen enriched air–methane flames under nonpremixed and premixed fuel-lean combustion conditions is examined with focus on emission of NO and CO, combustor exit temperature (Texit), and distribution of reaction zone in the combustor using OH* chemiluminescence intensity distribution. A cylindrical combustor was used at combustion intensity of 36 MW/m3·atm and heat load of 6.25 kW. Results are also reported with normal air (21% oxygen). Oxygen enrichment provided stable combustion operation at lower equivalence ratios than normal air and also reduced CO emission. Increase in oxygen concentration from 21% to 25% or 30% increased the NO and decreased CO emissions at all the equivalence ratios examined. Using 30% O2 enriched air in premixed case showed NO emissions of 11.4 ppm and 4.6 ppm at equivalence ratios of 0.5 and 0.4, respectively. Oxygen enrichment also reduced CO emission to 38 ppm at equivalence ratio of 0.5. Operating the combustor with normal air at these equivalence ratios resulted in unstable combustion. OH* chemiluminescence revealed increased intensity with the reaction zone to shift upstream at increased oxygen concentration. The exhaust temperature of the combustor increased with oxygen enrichment leading to lower CO concentration and increased combustion efficiency. The oxidizer injected at higher velocities moved the reaction zone to upstream location with simultaneous reduction of both NO and CO, specifically under nonpremixed combustion.

FIGURES IN THIS ARTICLE
<>
Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

A schematic of premixed and nonpremixed combustor arrangement

Grahic Jump Location
Fig. 2

NO concentration at the combustor exit for nonpremixed case

Grahic Jump Location
Fig. 3

CO concentration at the combustor exit for nonpremixed case

Grahic Jump Location
Fig. 4

NO concentration at the combustor exit for premixed case

Grahic Jump Location
Fig. 5

CO concentration at the combustor exit for premixed case

Grahic Jump Location
Fig. 6

OH* chemiluminescence intensity distribution at 21%, 25%, and 30% O2 concentration for nonpremixed (NP) and premixed (P) flames

Grahic Jump Location
Fig. 7

Combustor exit temperature for nonpremixed (NP) and premixed (P) cases

Grahic Jump Location
Fig. 8

NO concentrations at combustor exit in nonpremixed case using three different injectors

Grahic Jump Location
Fig. 9

CO concentration at the combustor exit in nonpremixed case using three different injectors

Grahic Jump Location
Fig. 10

NO concentration at the combustor exit for premixed case using three different injectors

Grahic Jump Location
Fig. 11

CO concentration at the combustor exit for premixed case using three different injectors

Grahic Jump Location
Fig. 12

OH* Chemiluminescence intensity distribution with 30% oxygen enriched air for nonpremixed (NP) and premixed (P) condition at 5/3D and 8/5D

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In