4.7 Article

Effect of methanol blending on the high-temperature auto-ignition of ammonia: An experimental and modeling study

Journal

FUEL
Volume 339, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.126911

Keywords

Ammonia; Methanol; Shock tube; Ignition delay; Chemical kinetics

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This study aims to investigate the influence of methanol addition on the auto-ignition of ammonia under high temperature and low pressure. The ignition delay times (IDTs) of ammonia/methanol mixtures were studied using a shock tube at different conditions. A simplification model (NH3-M model) was constructed based on the Zhang and FFCM-1 mechanisms, and chemical kinetic analyses were performed. The results showed that the addition of 5% methanol significantly shortened the IDTs of the ammonia/methanol mixtures.
To explore the effect of methanol addition on the auto-ignition of ammonia under high temperature and low pressure, the ignition delay times (IDTs) of ammonia/methanol mixtures were studied using a shock tube at equivalence ratios of 0.5, 1.0 and 2.0, temperatures of 1250-2150 K and pressures of 0.14 and 1.0 MPa. Based on the coupling of the Zhang and FFCM-1 mechanisms, a combined simplification model (NH3-M model) was constructed using the direct relationship graph method. Chemical kinetic analyses were then performed based on the NH3-M model. The results showed that the addition of 5 % methanol could shorten the IDTs of the ammonia/ methanol mixtures by more than 60 %. The correlation between the logarithm of the IDT of the ammonia/ methanol mixtures and the reciprocal of ignition temperature (ln tau ig similar to 1/T) was linear under different equiva-lence ratios and pressures. The IDTs of the ammonia/methanol mixtures were mainly affected by small radicals, such as OH, O, HO2 and H. The initial consumption of ammonia and methanol began with H-abstraction re-actions. Furthermore, it was not R466 (CH3OH + NH2 = NH3 + CH3O) and R467 (CH3OH + NH2 = NH3 + CH2OH) that directly promoted ignition but the active substances generated from the intermediates produced by R466 and R467 that facilitated the entire reactions.

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