Simulation on NH3/CH4/CH3OH Porous Media Combustion
As a carbon-free fuel,ammonia(NH3)is considered as an alternative fuel for thermal power generation to reduce carbon emission.Previous experimental studies show that porous media combustion,a technology that has been proved to be effective to enhance the combustion intensity and stability for low caloric fuels,can be applied to NH3 co-firing with more reactive fuel.However,the modelling study with careful consideration of heat transfer and chemical reaction is lacked.Based on the characteristic of high thermal conductivity of porous media,a one-dimensional model is established to simulate the combustion characteristics of NH3 blended with methane(CH4)and methanol(CH3OH)in porous media.The results show that the porous media has different effects on the two co-fired fuels.For CH4/NH3 fuel,the porous media significantly increases the burning rate and reduce the NH3 residue in the fuel-rich condition.For CH3OH/NH3 fuel,however,the effect of increasing burning rate and reducing NH3 residue is insignificant.For both co-fired fuels,the porous media combustion increases NOx emission in a similar extent,while using air stage combustion significantly reduces NOx.emission.
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