In the strategical context of carbon neutrality,ammonia(NH3),as a carbon-free fuel,has attracted great attention by the aca-demic communities and industries.In recent year,extensive studies are conducted on the associated combustion fundamentals.In the same time,several application researches and engineering demonstrations to burn NH3 in various industrial devices were carried out.Research progress of NH3 fuel utilization in coal-fired boiler and other combustion facilities were reviewed,and measures taken to resolve the two is-sues for NH3 combustion,i.e.,the weak stability and high NOx emission were focused on.In addition,some prospects in future research were given.Strategical analyses show that for carbon neutrality,NH3 has certain economic advantages over hydrocarbon fuels such as natu-ral gas.NH3 can be mixed with existing fuel or active fuels such as H2 and methane to increase combustion intensity,and can even be solely burned through preheating,catalytic decomposition,and oxygen enrichment measures.The most common and effective method to re-duce NOx in industrial devices is air-staged combustion.NH3 combustion in IC engines is prone to stable,but NOx emissions are relatively high.Therefore,NOx emission reduction is a key focus of future work.The application research of NH3 fuel in gas turbines mainly focus on numerical simulation and a few small-scale gas turbine tests.Stable and low NOx emission have been achieved,but research on large-scale gas turbines is still lacked.The application research on NH3 fuel utilization in boilers focus on the co-combustion of NH3 with pul-verized coals.China is active in NH3-coal combustion research,has recently conducted industrial tests on a 300 MW coal-fired boiler with a maximum NH3 to coal calorific ratio of 35％.More research with larger NH3 co-firing ratio are needed.Circulating fluidized bed(CFB)boilers are ideal NH3 combustion device over the pulverized coal fired boiler,and attention should be paid in the future.
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