Gliding arc plasma effect on thermal characteristics of ammonia/biogas flames

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-03-08 DOI:10.1016/j.tsep.2025.103494

Adolfas Jančauskas, Rolandas Paulauskas, Ernest Bykov, Kęstutis Zakarauskas, Ignas Ambrazevičius

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Abstract

This study investigates the effects of varying ammonia (20-80 vol% NH₃) concentrations in biogas on flame chemiluminescence, radiative properties under plasma-assisted combustion at different fuel equivalence ratios (φ). The experimental analysis characterizes the flames’s OH* and NH₂* emissions, the radiant intensity of CO₂ and H₂O emitters, and heat flux variations. Research indicates that the emission intensity of OH* and NH₂* is proportional to the fuel equivalence ratio, while flame height decreases at varying rates. IR spectras (2000–5000 nm) from flames reveal that the main CO₂ and H₂O radiation sources depend on the ammonia dilution and plasma discharge voltage. It was determined that plasma assistance enhances combustion conditions and expands the flammability limits of NH₃/biogas mixtures. During plasma-assisted combustion of 40 vol% ammonia-diluted biogas mixture an 18 % increase in H₂O (2505 nm) emission intensity was determine increasing voltage from 4.6 kV to 8.3 kV and a strong correlation between H₂O emitter radiation and OH* emission intensity was determined. Besides, a plasma discharge increase from 4.6 kV to 8.3 kV can increase heat flux up to 42 % during plasma-assisted combustion, while increase of NH₃ dilution negatively impacts heat flux without plasma assistance − heat flux decreases from 4 to 5 % by diluting biogas from 20 to 80 vol%.

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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