Characteristics analysis of ammonia/coal co-firing with air staged combustion in one-dimensional self-sustained combustion experimental furnace
Previous studies on ammonia/coal co-firing have focused on numerical simulations and small-scale test furnaces,while large-scale test furnaces are mostly used for point-case tests of technical feasibility.In this paper,a detailed study of the emission and process distribution characteristics of ammonia/coal co-firing was carried out in a 50 kW one-dimensional self-sustained combustion experimental furnace under different operating conditions.In order to fully understand the contribution of ammonia and coal to NO production during the combustion process,a series of experimental studies were carried out for pure ammonia combustion.Air-staged combustion greatly re-duces NO emissions from ammonia/coal co-firing combustion.With ammonia co-firing ratios ranging from 10％to 90％,NO concentra-tions varie from 170 to 215 mg/m3,which are at the same level with pure coal combustion.The optimal burnout air ratio is maintained near 38％.Further increasing the burnout air ratio will not further reduce NO emissions,but will lead to negative effects such as inade-quate combustion.Pure ammonia combustion employing air-staged combustion technology can manage the exported NO concentration,but its stability is significantly worse than that of ammonia/coal co-firing,and ammonia is prone to escape when the oxygen concentration in the operation is low.Ammonia/coal co-firing may not only solve the problems of ammonia combustion difficulties and excessive NO emis-sions,but it can also minimize CO2 emissions from coal combustion,making it a very attractive technology route for future energy growth.
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