Chemical mechanism and N2O generation analysis of ammonia-methanol combustion in low proportions of methanol blends
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.
NETL
NSTL
万方数据
