Abstract
Due to zero-carbon nature of ammonia and hydrogen, their blend fuel is proposed in many fields of combustion. In this study, the feasibility of using Bunsen flame burning ammonia-hydrogen-air for impingement heating is evaluated. It is found that within the ranges of Re and Ф, there exists a threshold value of XH2 beyond which cone-shaped flames stably burn on Bunsen burner. For XH2 = 5–50%, addition of hydrogen promotes flames stability by increasing laminar burning velocity to match the high flow speed at 800 ≤ Re ≤ 1000. Besides, richer mixture also improves flame stability due to more abundant radicals. In the range of 0.8 ≤ Ф ≤ 1.4, shorter flame height while higher flame temperature occurs near stoichiometric conditions of 1.0 ≤ Ф ≤ 1.2, which is favorable for compact and rapid heating applications.Examination of NO formation mechanism from free flame reveals that increasing XH2 or decreasing Ф leads to more NO emission, finding that it is much sensitive to the operational parameters of XH2, Ф and Re. But NO emission becomes less sensitive when the flame is under impingement. Further, NO emission becomes lower, which a favorable feature of using ammonia-hydrogen-air flame for impingement impinging. Lastly, comparison of thermal power and efficiency between natural gas and ammonia-hydrogen reveals that the latter fuel is sufficient to replace the former in industrial heating applications.
Published Version
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