Outlook for Multiple Fuel Circulating Fluidized Bed Combustion Technologies for the Dual Carbon Goals
The dual carbon goals bring widespread attention to the decarbonization of coal-fired power units.Low-carbon fuel substitution is one of the important directions of circulating fluidized bed(CFB)combustion technology development for power generation.The properties of zero-carbon,low-carbon fuels significantly differ from those of coal,which is a new challenge to the fuel adaptability of CFB combustion technology.The theoretical basis of fuel adaptability of CFB combustion technology is analyzed in this paper from the perspectives of fuel ignition and bum-out,low-cost pollutant control and heating surface safety.The big bed material heat capacity and efficient material circulation are the two solid pillars to support its adaptation to multiple low-carbon fuels.The adaptability of the CFB combustion technology to the combustion of multiple low-carbon fuels can be further improved by constructing a reasonable flow pattern and atmosphere inside the boiler furnace.For biomass fuels,the use of circulating bed material to brash the heating surface,alleviating the staining and corrosion issue,can improve the steam parameters of biomass power generation,and thereby improve the economy of biomass power generation.For ammonia fuels,high-temperature bed material heat capacity in the furnace can be used to stabilize combustion,and the furnace atmosphere conditioning can be used to suppress nitrogen oxide formation,which is expected to overcome the high efficiency and low cost of ammonia fuel combustion.For ultra-low-calorific-value industrial off-gas,the use of CFB combustion technology can turn the waste into energy,significantly improving the economics of waste gas treatment,thus reducing system energy consumption and carbon emissions.Facing the dual carbon goals,CFB combustion technology will further expand its advantage of broad fuel adaptability,presenting a promising prospect.
dual carbon goalscirculating fluidized bedbiomassammonia fuelsintering flue gas
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