Simulation on Emission Characteristics of Ammonia Combustion in a Circulating Fluidized Bed Boiler
Ammonia combustion with circulating fluidized bed(CFB)technology is expected to address the challenges of its low flame propagation speed and unstable combustion characteristics with high efficiency and low cost,thereby facilitating the utilization of carbon-neutral fuels derived from renewable sources.A comprehensive mathematical model for CFB-based ammonia combustion was developed,incorporating both homogeneous and heterogeneous catalytic reactions of ammonia.The emission characteristics of an ammo-nia-fired CFB boiler,including ammonia slip and nitrogen oxide emissions,were analyzed alongside the im-pact of operating parameters such as bed temperature,excess air ratio,air staging,and fuel staging.Re-sults show that directly employing the design and operational strategies of traditional coal-fired CFB boilers for ammonia combustion of CFB boilers results in relatively high levels of ammonia slip and nitrogen oxide emissions.However,suitable adjustment of operating parameters can markedly enhance emission charac-teristics.
万方数据
维普
