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The oxygen-deficient combustion and its effect on the NOx emission in a localized stratified vortex-tube combustor.
- Source :
-
Energy . Nov2021, Vol. 235, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- The oxygen-deficient combustion characteristics of methane in a localized stratified vortex-tube combustor (LSVC) are studied by diluting combustion air with nitrogen. The influences of oxygen mole fraction (0.13–0.21) on flame configuration, combustion stability, combustion efficiency, and NO x emission characteristics are experimental investigated at the inlet temperature of 300 K. Combined with the numerical simulation method, the NO x generation, and emission mechanisms are analyzed in this combustor. Results show that the LSVC can achieve a wide stability limit, in which the global equivalence ratio can be as low as 0.22 at the lowest oxygen mole fraction (β) of 0.13. To ensure high combustion efficiency, the β should be kept above 0.16 since the oxygen-deficient condition reduces the reaction rate and flame temperature. The combustor can achieve ultra-low NO x emission of below 10 ppm (@ 15 vol% O 2) due to low oxygen concentration and flame temperature. Furthermore, part of NO x entrained into the fuel-rich reduction zone by the swirl flow field is reduced by the reductive species (i.e., CO and H 2) to further lowering NO x emissions. The results of this paper can guide the development of the LSVC in the high-efficiency and low-emission combustion fields. • Low NO x emission with high stability can be achieved via a simple structure. • Steadily combustion results from the optimization structure of this combustor. • Low combustion temperature is the principal reason for the low NO x emission. • Generated NO x can be reduced by the stratified species distribution. • The flow field can promote the transport of the NO x to the reduction region. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03605442
- Volume :
- 235
- Database :
- Academic Search Index
- Journal :
- Energy
- Publication Type :
- Academic Journal
- Accession number :
- 152445942
- Full Text :
- https://doi.org/10.1016/j.energy.2021.121365