Research On Blast Furnace Deadman And Its Application To Operation Of Furnace Type Hot Metal

The blast furnace hearth is like a "black box",and its internal changes cannot be visualized,so the molten iron flowing state in the furnace cannot be accurately judged.After years of research by metallurgical workers,it is found that the state of the deadman of the blast furnace is one of the main factors affecting the change of the molten iron flow in the hearth.However,the state of the deadman of the blast furnace is unobservable and measurable.Therefore,this study uses mechanical calculations and image processing.The software and other methods are used to judge the change of the state of the deadman,and based on this,the CFD simulation method is used to calculate the influence of different deadman states and different iron mouth systems on the state of the molten iron flow conclusion as below:This study mainly uses mechanical methods to qualitatively determine the shape of the blast furnace deadman(sitting or floating),and the image processing software identifies images of different sections of the furnace hearth during blast furnace overhaul,to simulate the impact of the deadman on the flow of molten iron under different conditions.The results show that when the void volume in the central area of the deadman decreases from 0.35 to 0.05,the molten iron flow rate in this area will gradually slow down,while the molten iron flow rate at the edge of the furnace will gradually increased,and compared with the deadman floating,the molten iron flow rate is greater when the deadman sitting down,indicating that the deadman can relieve the scouring of the furnace wall by the molten metal.Studying the influence of iron port parameters on the molten iron flow in the hearth found that within the range of parameters selected in this paper,the parameters such as iron depth,iron angle,iron diameter,and ladle diameter were changed to simulate the flow of molten iron in the furnace.The results show that when the iron mouth depth increases from 3400 mm to 3800 mm,the maximum molten iron flow velocity in the furnace edge and bottom area will gradually decrease.When the inclination angle of the iron mouth reduces from 13° to 7°,the maximum molten iron flow rate at the edge of the hearth and the bottom of the furnace will gradually decrease.When the diameter of the iron mouth increases from 30 mm to 90 mm,the maximum flow rate of molten iron at the edge of the hearth and the bottom of the furnace will gradually decrease.When the diameter of the ladle changes,the flow rate of molten iron will also be affected,among which when the diameter is 600 mm,the molten iron flow rate in the area below the iron nozzle is the smallest.Therefore,under normal circumstances,reasonable adjustment of the parameters such as the depth of the iron nozzle,the angle of the iron nozzle,the diameter of the iron nozzle,and the diameter of the sludge can alleviate the scouring of the furnace side wall by the molten iron,so that the life of the blast furnace hearth is effectively extended.