Numerical Simulation Study of Fluidized Bed Air Distribution Ratio on Furnace Wear based on Eulerian-Lagrangian Approach
The circulating fluidized bed boiler,as a clean coal combustion technology in universities,has been widely used.In order to reduce problems such as abnormal shutdown and leakage of the fluidized bed,this paper uses the Euler Lagrangian discrete method in computational fluid dynamics to numerically simulate the cold gas-solid circulating fluidized bed furnace.By comparing the wear of the furnace water-cooled wall under three different ratios of primary and secondary air The particle accumulation sit-uationandthefluctuationofwallshearstresshavebeenfoundthatalargerairdistributionratiocanlead to smaller overall wear of the fluidized bed furnace and smaller fluctuation of wall shear stress.The main reason is that increasing the primary air volume reasonably can improve the combustion efficiency of the boiler,make the combustion of particles in the furnace more complete,reduce the number of coal parti-cles staying and accumulating in the furnace,and make the particle distribution more uniform,This re-duces the occurrence of particle collision,erosion and wear in the furnace.
circulating fluidized bedprimary and secondary airboiler furnaceabrasion
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