关键词: 氨/甲醇燃烧, 化学反应机理, 化学动力学建模, 甲醇掺混, 一氧化二氮（N₂O）

Abstract:

In order to investigate the benefits of ammonia fuel in reducing greenhouse gas (GHG) emissions, and overcome the shortcomings of high ammonia ignition energy and slow laminar flame speed, a chemical reactor network (CRN) model of the combustion of methanol-ammonia mixtures was developed using Chemkin to analyze the component evolution, product generation rate and sensitivity of low proportion methanol (0~10%) and ammonia combustion. Chemical reaction kinetics was used to analyze the N₂O generation/reduction mechanism. The results show that pure ammonia combustion at equivalence ratios of 1.1-1.2 can concurrently decrease emissions of NO, unburned NH₃, and N₂O, resulting in a reduction of over 70% in GHG emissions compared to pure methanol combustion. Ammonia combustion remains beneficial for GHG emission control when the equivalence ratio exceeds 0.9. Methanol addition effectively controls N₂O generation, further mitigating GHG emissions. Under rich combustion conditions, methanol addition promotes H generation, leading to increased N₂O consumption. However, under lean combustion conditions, methanol enhances the suppression of NH production, resulting in reduced N₂O generation. Moreover, increasing pressure and temperature can effectively reduce GHG emissions, although the mechanisms vary.

Key words: ammonia-methanol combustion, chemical mechanism, kinetic modelling, methanol addition, nitrogen dioxide(N₂O)