Numerical Simulation of Bag-Type Collector Flow Field in Biomass Energy Power Plant

With the computational fluid dynamics software FLUENT the flow field of flue gas from one 75 t/h circulating fluidized bed combustion boiler was simulated. The results showed that when air distribution was not taken into account, the flow of the two flue gases in the bag filter were not uniform. The flow field of coal flue gas was more disordered than that of biomass, but the majority of them moved upward directly. The uniformity was improved after the guide plate was added. Small particles and big ones of flue gas fell apart to two fractions in the middle of the guide plate, big ones on the left and small ones on the right, and both of them did circumferential motion in the bag filter. The results of the numerical simulation supplied reference to the operating and design of filtering bag-type collector for biomass plant.