Numerical simulation and experimental study on combustion in a water cooled strawfired boiler with vibrating grate in Nong'an Boimass Power Plant were performed.By building the unit cell model

the straw combustion process on the simulated grate and in the furnace gas phase was investigated.The effect of changing the ratio of primary air volume and secondary air volume on the combustion characteristic was analyzed

and the distribution of straw layer's temperature

density and top gaseous phase concentration

as well as the distribution of the furnace gas temperature

velocity and NOx concentration under different conditions were obtained.The results showed that

the simulation results agreed well with the experimental results.Due to the increase of primary air volume

the combustion efficiency of the fuel layer was improved.The NOxconcentration reached the minimum when the ratio of primary air volume to the secondary air volume was 1∶1.2.