Design of Three-stage Fluidized Bed Reactor for Flue Gas Waste Heat Recovery in Arc Steel Plant
A combined fluidized bed reactor was designed to deal with the heat loss caused by high temperature flue gas emission during the batch-type electric arc furnace steelmaking.The heat recovery process is as follows:the hydrated lime powder(Ca(OH)2)is used as the medium,the heat in the flue gas at high temperature(>600℃)is absorbed in the entrainment flow reactor,and the heat is converted into CaO,and then the CaO is placed in the fluidized bed reactor for hydration reaction,and the Ca(OH)2 is re-generated and the heat is released and cooled,which is used to heat the thermoelectric cycle of the circulating water of the boiler condenser.Recycle hydrated lime involved in heat recovery.According to the temperature requirements of CaO cooling and reaction,the fluidized bed reactor consists of three sections:high temperature section,reaction section and low temperature section.The superheated CaO powder passes through each fluidized bed layer successively from top to bottom.The design includes heat transfer process calculation,mechanical structure design and accessory selection.The three-stage fluidized bed is a whole structure with good processability,which can be used as a reference for manufacturing design of batch waste heat utilization equipment.
electric arc furnace steelmakingflue gas waste heatfluidized bed reactor
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