Design method of parameters of cross air blasting guns in AOD refining process
A side blow gun and design method technology, applied in the field of molten steel refining, can solve the problems of increased consumption of fuel ferrosilicon and slag lime, unreasonable design of tuyere parameters, melting loss of tuyere refractory materials, etc., to reduce smelting costs , Eliminate uneven cooling and reduce heat loss
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Embodiment 1
[0057] Example 1: A 10-ton AOD furnace in a certain factory uses 3 copper tubes with inner diameter D: 8mm, copper tube wall thickness d: 1mm, ring seam width h: 0.5mm, and oxygen supply intensity of 10m³ / min. The pressure requirement is 1.6MPa, and the pressure behind the valve is 1.0MPa. The air gun cooling adopts a single regulating valve to centrally control the three air guns. The furnace age is generally about 30 furnaces. After calculation and analysis, it is concluded that:
[0058] Center tube cross-sectional area S: 50.24mm²; annular seam cross-sectional area F: 16.49mm²; S / F=3.05 d / h=2.0;
[0059] In the process of use, the refractory material in the local air gun area is often severely melted. The reason is that the cooling system adopts a single regulating valve centralized control, resulting in a serious shortage of local air gun cooling; secondly, because the ring seam width is 0.5mm, During the process, the support point of the outer stainless steel tube is no...
Embodiment 2
[0061] Example 2: A 20-ton AOD furnace in a factory uses 3 copper tubes with inner diameter D: 14mm, copper tube wall thickness d: 1.5mm, ring seam width h: 1.0mm, and oxygen supply intensity of 30m³ / min. The front pressure is required to be 1.8MPa, and the pressure behind the valve is 0.80-1.0MPa. The cooling of the air gun adopts a single regulating valve to centrally control the structure of the three air guns. The furnace age is generally about 30-40 furnaces. After calculation and analysis, it is obtained that: the cross-sectional area of the central tube S: 153.86mm²; the cross-sectional area of the annular seam F: 56.52mm²; S / F=2.72 d / h=1.5;
[0062] The selection of cooling parameters meets the requirements, mainly because the inner diameter of the central copper tube is too large, resulting in a significantly lower pressure behind the valve, shortening the core section of the airflow at the outlet of the air gun, and concentrating the oxygen reaction zone in the re...
Embodiment 3
[0064] Example 3: A 60-ton AOD furnace in a factory uses 3 copper tubes with inner diameter D: 16mm, copper tube wall thickness d: 1.0mm, ring seam width h: 1.0mm, and oxygen supply intensity of 60m³ / min. The front pressure is required to be 2.0MPa, and the pressure behind the valve is 1.3-1.5MPa. The air gun cooling adopts decentralized control, and the cooling of each air gun is cooled by an independently controlled regulating valve. The furnace age is generally around 100 furnaces. . After calculation and analysis, it is concluded that:
[0065] Center tube cross-sectional area S: 200.96mm²; annular seam cross-sectional area F: 59.66mm²; S / F=3.37 d / h=1.0
[0066] Although the cooling intensity seems to be weak, due to the independent control of the cooling system, the distribution of cooling air in each air gun is absolutely uniform, so that each air gun can be cooled evenly, and local refractory materials are avoided from serious melting loss due to uneven cooling . The...
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