| 75 t / h of biomass circulating fluidized bed combustion boiler was taken as the object of study. The temperature field, flow field, formation of NO_x and gas flow distribution in bag filter were analog computed with CFD software FLUENT. By the results it was got that temperature filed of cola was higher than that of biomass, and emission of NO_x from circulation fluidized bed biomass boiler was less than emission standard. The result of numerical calculation to bag filter showed that: when air distribution was not taken measured, it was obviously that both the two kinds of flue gas flow in bag filter were not uniform. The flow field of coal flue gas was more disordered than that of biomass, but majority of them moved upward directly. The uniformity was improved obviously 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 this paper supplied reference to the control of pollution of flue gas in the biomass.
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