Simulation Study of Fly Ash Viscous Deposition on the Heating Surface of Biomass Boiler
For the phenomenon of melt slagging on the high-temperature heating surface of a biomass boiler,the characteristic temperature of adhesion was obtained by combining the data on ash melting characteristics and fitting them segmentally,and a comprehensive fly ash viscous deposition model based on the critical deposition velocity criterion was developed to simulate the surface ash characteristics of a biomass boiler high temperature heating surface.The results show that small particles of 20～50 μm have high average temperatures and are more likely to melt and produce viscous deposits,and 50 μm has the largest amount of fly ash deposited.Deposition in the high-temperature region of the furnace is dominated by a viscous deposition mechanism,whereas the high-temperature superheater viscous deposition rate is only 10.5％of the measured value,suggesting that other forms of deposition are present and that viscous deposition is no longer dominant.The model can be used to predict biomass ash melt slagging at high temperature heating surfaces.
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