Simulation Study On High-Temperature Corrosion Of 660MW Supercritical Pi-type Furnace About The Water-wall Of Boiler

Power coal in our country coal,coal quality deviation big,the quality can't guarantee anything,at the same time,due to the large power plant boiler combustion mode itself,often lead to burning in a variety of boiler efficiency,safety,and environmental problems.As boiler high parameterized(higher pressure,higher temperature),some problems in the common DC burner: boiler furnace increases,the corners of the arrangement of the burner jet rigidity is not enough;The increase of the capacity of the boiler,furnace section also increases accordingly,furnace temperature field,air dynamic field inhomogeneity is more prominent,as a result of the combustion air distribution is not reasonable,primary air pulverized coal stick the wall,especially in the sulfur content in coal is higher and the wall present reducing atmosphere,often appear water wall,high temperature corrosion problems such as serious slagging,directly endanger the safety,reliability and economy of boiler operation.In this paper,the problem of high temperature corrosion of water cooling wall of a 660 MW supercritical boiler is simulated using FLUENT,and two schemes are used to simulation it.First is to add a stick-wall wind,through the analog a stick-wall under different rate of wind to find the optimal stick-wall wind,that wind covering radius of the big and small impact on the boiler combustion,the simulation results show that stick-wall wind effectively reduces reducing-atmosphere near the water wall,improved the high temperature corrosion of water wall;The second is the changing tangential way,under the condition of the tangential diameter unchanged adopting new wall type,to simulate the tangential way to compare different position under the tangential in furnace,and confirmed the best tangential position,the simulation results show that the wall tangential makes better aerodynamic field,temperature field in the furnace,but there still exists certain area of reducing-atmosphere area,failed to fundamentally change the problem of high temperature corrosion of water wall.