Gas permeation type cinder dam
A slag retaining weir and air-permeable technology, which is applied in the field of slag retaining weir, can solve the problems of unconcentrated steel flow, uneven temperature of molten steel, application limitation, etc. Effect
Inactive Publication Date: 2006-12-13
NORTHEASTERN UNIV +1
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Problems solved by technology
In this way, the fine inclusions and harmful elements in the molten steel cannot get the rising power and cannot be fully floated and removed, and directly flow into the crystallizer from the tundish with the molten steel, so that the function of the slag retaining weir is limited, and even the tundish covering agent cannot be used to absorb inclusions and harmful elements. The role of elements
Secondly, with the prolongation of the continuous pouring time, the slag retaining weir is gradually eroded, resulting in the expansion of the diameter of the flow steel hole, which not only makes it more difficult to produce an ideal flow field, but also the erosion of the slag retaining weir itself becomes the source of inclusions in the slab
Furthermore, when the molten steel passes through the slag retaining weir, if there is no stirring power and the flow is uneven, not only will the temperature of the molten steel be uneven, but the flow field of the tundish will not be fully optimized, and sometimes a dead zone will be caused, which will seriously cause production accidents
Therefore, blowing argon in the tundish is one of the important means to solve the above problems, but blowing argon through the stopper or nozzle is easy to cause turbulence and slag entrainment, and the practical effect is not good
The air curtain retaining wall mixes the slag in the impact area and the tundish covering agent, which is prone to secondary oxidation, and the steel flow cannot be concentrated, and its application is also limited
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0016] Embodiment 1: see figure 1 , 2 , air-permeable slag-retaining weir, including slag-retaining weir 2, in which a gas supply pipe 8 is buried vertically, and the bottom of the downstream side of the slag-retaining weir is attached with a horizontally outwardly protruding air-blowing and ventilating device 6, on which there is a ≤0.1mm Blowing slot 7, the air supply pipe is connected with the blowing slot, and the air flow is adjustable from 50l / min to 250l / min. The width of the air blowing and ventilation device is smaller than that of the slag retaining weir, and the two ends are indented by, for example, 100-150mm.
Embodiment 2
[0017] Example 2: see image 3 , as mentioned above, the slag retaining weir 2 is V-shaped, and the outwardly protruding blowing and ventilating device 6 attached to the lower bottom of the downstream side has the same shape as it, and also has a V structure.
Embodiment 3
[0018] Embodiment 3: see Figure 4 , as mentioned above, the slag retaining weir 2 is arc-shaped, and the outwardly protruding air-blowing and ventilating device 6 attached to the lower bottom of the downstream side has the same shape as it, and also has an arc-shaped structure.
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Abstract
The invention relates to a technology which uses up blowing argon gas to ameliorate steel liquid skim weir of the continuous casting middle bag. The invention sets argon blowing device in the lower place of the skim weir. And the argon gas is supplied through the gas supplying pipe. The invention not only has skimming function, also removes the impurity better. About 90 percent hypobaric impurity can be removed, and the hyperbaric about 60 percent. The impurity brought out by widening the skim weir bore can be removed completely. The invention improves the metallurgy quality and the fluid of the middle bag, makes temperature and compound of the steel fluid well-proportioned, so that smelt and clean the steel fluid.
Description
technical field [0001] The invention relates to the improvement of the slag retaining weir of the continuous casting tundish, in particular to a slag retaining weir capable of generating upward air flow and improving the flow of molten steel. Background technique [0002] The tundish is the storage and distribution container for molten steel between the ladle and the mold. It is the most important molten steel refining equipment in the continuous casting process and one of the key factors determining the purity of molten steel. Therefore, in the continuous casting process, the tundish slag weir is usually used to improve the flow field of molten steel, so that the tiny inclusions and harmful elements in the molten steel can effectively collide, grow up and float, and be absorbed by the upper covering agent to be removed. A reasonable flow field of molten steel in the tundish is the premise to promote the accumulation, growth and removal of inclusions and harmful elements in ...
Claims
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Inventor 吴永来朱苗勇姜茂发杨政宏
Owner NORTHEASTERN UNIV