CFD modeling of a small-scale waste incinerator operated at high altitudes
To ensure the stable and efficient operation of a small-scale waste incinerator with a capacity of 75 t/d at high altitudes,a computational fluid dynamic model was established based on the FLIC and FLUENT software,coupled with bed solid-phase combustion and furnace gas-phase combustion models.The velocity,temperature and gas species concentration profiles in the incinerator were analyzed numerically,the influence of altitude was simulated,and the ratios of primary to secondary air,secondary air configuration and grate speed were further optimized.The simulation results show that compared to the incinerators in the plain area,the small-scale incinerator in the high-altitude area exhibits slower drying,pyrolysis and combustion rates,as well as lower furnace temperature.Increasing the primary air volume while reducing the secondary air volume could increase the furnace temperature and improve the operation stability of the incinerator.An optimal secondary air ratio of 1∶8.5∶5.5 could keep the high-temperature zone away from the furnace walls and reduce the risk of wall slagging.With increasing the grate speed,the maximum bed temperature decreases,and the combustion core moves forward.A grate speed of 8 m/h is optimal for the current small-scale waste incinerator operated at high altitude zones.
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