Numerical Simulation Study of Combustion Characteristics of Wall Fired Boiler with Different Burner Arrangements
A 600 MW wall fired boiler is modified with burner arrangement,and different distance and angle offsetting schemes are adopted for the three layer burners.Numerical simulation methods are used to study the combustion characteristics of the boiler under different modification schemes.Numerical sim-ulation results show that:after the wall-side burners are skewed inward by 5°,the flow field in the fur-nace develops more fully,and the effect of air shocking is stronger;the middle and upper burners are shifted upward too high,and the asymmetry of high temperature zone in the furnace cross-section at the height of the burners is obvious,which is not conducive to the control of the heat load bias in the hearth cross-section;after adopting burner skewed by 5°,the flames of the wall-side burners are obviously skewed to the hearth,squeezed inward,which makes the middle two The flame length of the middle two burners becomes longer,and the high-temperature region in the furnace gathers more to the center of the furnace.When the burner skewing is not used,the area of the high-temperature region in the trans-verse cross-section of the lower chamber of the screen superheater in Case2 is the smallest,and the area of the high-temperature region increases significantly after the burner skewing is used,which is not con-ducive to the control of the slagging phenomenon of the screen superheater,and the concentration of NOx emission is significantly increased.
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