Effects Of Burner Structure Of 660MW Supercritical Boiler On The Flow Field In The Furnace

Regarding to the problem of coking or opposite direction of tangential,this paper proposed to modify the buner.Simulating the influence of bluff body and guide plates on the direction and diameter of tangential firing,is beneficial to the optimal design of burner and efficient running of boiler.According to the phenomenon of tangential reverse appeared in actual operation,with the simulation software ICEM CFD and FLUENT,this paper studied the effect of the shape and location of bluff body and the number of vanes on direction and diameter of tangential firing.Combined with the simulation results,this paper formulated two solutions separately to solve the problem of tangential direction opposite to design.To form an anticlockwise circle in furnace,this paper searched the tangential direction in the furnace reformed by the two methods with the facilities of ribbons,fan and anemograph,etc.The research showed that,under the condition of the bluff body in the same direction,changing the number or the location only couldn't change the tangential direction.Under the condition of guide plates in the same number,only changing the direction of bluff body couldn't change the tangential direction.Changing the direction and location of the bluff body to a reasonable structure,and suitably decreasing the cover ratio of the vanes can change the flow field from clockwise to anti-clockwise.Besides,when the cover ratio is invariant,the number or location of the vanes doesn't have key effect on the direction changing of the tangential flow field.Mirroring the bluff body directly can't change the tangential flow field to anti-clockwise direction,but clockwise and anti-clockwise alternately.Mirroring the bluff body,then removing to the low concentration side and rotating clockwise had an obvious effect on changing the tangential direction to anti-clockwise,and primary air forms the phenomenon of wind bag powder.