The combustion stability (extinction) limits and nitrogen oxide (NO<SUB>x</SUB>) emissions of nonpremixed ammonia (NH<SUB>3</SUB>)-hydrogen (H<SUB>2</SUB>)-air flames at normal temperature and pressure are studied t...
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https://www.riss.kr/link?id=A107687117
Um, D.H. ; Joo, J.M. ; Lee, S. ; Kwon, O.C.
2013
-
SCOPUS,SCIE
학술저널
14854-14865(12쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
The combustion stability (extinction) limits and nitrogen oxide (NO<SUB>x</SUB>) emissions of nonpremixed ammonia (NH<SUB>3</SUB>)-hydrogen (H<SUB>2</SUB>)-air flames at normal temperature and pressure are studied t...
The combustion stability (extinction) limits and nitrogen oxide (NO<SUB>x</SUB>) emissions of nonpremixed ammonia (NH<SUB>3</SUB>)-hydrogen (H<SUB>2</SUB>)-air flames at normal temperature and pressure are studied to evaluate the potential of partial NH<SUB>3</SUB> substitution for improving the safety of H<SUB>2</SUB> use and to provide a database for the nonpremixed NH<SUB>3</SUB>-substituted H<SUB>2</SUB>-air flames. Considering coflow nonpremixed NH<SUB>3</SUB>-H<SUB>2</SUB>-air flames for a wide range of fuel and coflow air injection velocities (V<SUB>fuel</SUB> and V<SUB>coflow</SUB>) and the extent of NH<SUB>3</SUB> substitution, the effects of NH<SUB>3</SUB> substitution on the stability limits and NO<SUB>x</SUB> emissions of the NH<SUB>3</SUB>-H<SUB>2</SUB>-air flames are experimentally determined, while the nonpremixed NH<SUB>3</SUB>-H<SUB>2</SUB>-air flame structure is computationally predicted using a detailed reaction mechanism. Results show significant reduction in the stability limits and unremarkable increase in the NO<SUB>x</SUB> emission index for enhanced NH<SUB>3</SUB> substitution, supporting the potential of NH<SUB>3</SUB> as an effective, carbon-free additive in nonpremixed H<SUB>2</SUB>-air flames. With increasing V<SUB>coflow</SUB> the NO<SUB>x</SUB> emission index decreases, while with increasing V<SUB>fuel</SUB> it decreases and then increases due to the recirculation of burned gas and the reduced radiant heat losses, respectively. Given V<SUB>coflow</SUB>/V<SUB>fuel</SUB> the flame length increases with enhanced NH<SUB>3</SUB> substitution since more air is needed for reaction stoichiometry. The predicted flame structure shows that NH<SUB>3</SUB> is consumed more upstream than H<SUB>2</SUB> due to the difference between their diffusivities in air.
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