Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw

Biomass fuels play an important role in the field of fluidized bed combustion, but due to diversity and uncertainty fuels, there are usually some problems high CO emission that cannot be directly solved by combustion adjustment. In this paper, a 75 t/h biomass was taken as research object. It observed from test gas incomplete loss reached 12.13% when mono-combustion wheat straw conducted, concentration exhaust exceeded 30k ppm. Combined with CPFD numerical simulation, characteristics influence secondary air layout on reduction performance were discussed detail. The results revealed temperature gradually increased along furnace height under initial condition, maximum more than 1000 °C at outlet. curtain jets insufficient, rose rapidly it entered into furnace. By arranging adjacent ports above each fuel-feeding inlet, residence time particles could significantly increased, thus, distribution reasonable reduced 58.6%.