Positive pressure strong nozzle for molten steel transfer
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A molten steel and pressure technology, which is applied in the field of metallurgy, can solve problems such as slag protrusion, lower molten steel quality, and unusable residual steel, and achieve the effects of reducing processing costs, improving molten steel quality, and improving steelmaking production efficiency
Active Publication Date: 2020-10-13
万恩同
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[0004] For some high-grade steel types, steel mills often adopt the method of sacrificing the yield of molten steel and closing the nozzle in advance, resulting in a large amount of residual steel in the converter, ladle, and tundish that cannot be used; In this case, the steel slag is allowed to mix into the molten steel
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[0061] Example 1: A positive pressure nozzle, R1=20mm, R2=30mm, L=150mm, three slope-shaped diversion grooves 3, evenly distributed around the molten steel pool 1; D1=120mm, D2=60mm, H1= 60mm, D3=40mm, H2=250mm, D4=35mm, H3=20mm, H4=20mm, discharge time 23s, vortex critical height is about 30mm, and taper transition section 2 from top to bottom 1 / 4, 1 / Drill three small holes at 2 and 3 / 4 positions. When the valve is opened, water can be seen flowing out from the small holes, and the range of the water flow is farther. It shows that the water flow has produced positive pressure, and the positive pressure at the bottom of the nozzle is greater;
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[0062] Example 2: A positive pressure nozzle, R1=20mm, R2=40mm, L=150mm, three slope-shaped diversion grooves 3, evenly distributed around the molten steel pool 1, D1=200mm, D2=70mm, H1= 80mm, D3=50mm, H2=350mm, D4=40mm, H3=20mm, H4=20mm, discharge time 21s, vortex critical height <40mm, the vortex strength is weak, the stream is a regular flow, the impact on the next container is weak, the sound is small, and the water bubbles are large and the number is small;
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[0063] Example 3: A positive pressure nozzle, R1=20mm, R2=40mm, L=150mm, three slope-shaped diversion grooves 3, evenly distributed around the molten steel pool 1, D1=240mm, D2=70mm, H1= 80mm, D3=50mm, H2=400mm, D4=40mm, H3=20mm, H4=150mm, discharge time 18s, vortex critical height <40mm, slightly larger than Example 2, the vortex strength is weak, the stream is a regular flow, the impact on the next container is weak, the sound is small, and the water bubbles are large and the number is small.
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Abstract
The invention relates to the technical field of metallurgy, and discloses a positive pressure strong nozzle for molten steel transfer. The positive pressure strong nozzle comprises a molten steel gathering area and a conical transition section which are sequentially arranged in a sealed mode in the molten steel flowing direction, and the molten steel gathering area and the conical transition section are in a big-end-up hollow inverted circular truncated cone shape. The positive pressure strong nozzle further comprises one to four slope-shaped flow guide grooves, the slope-shaped flow guide grooves are of a transverse semicircular truncated cone structure, the ends, with relatively large depth, of the slope-shaped flow guide grooves communicate with the molten steel gathering area, the upper surfaces of the slope-shaped flow guide grooves are flush with the upper surface of the molten steel gathering area, the slope-shaped flow guide grooves take a line which passes through the center of the molten steel gathering area in the incoming flow direction as a symmetry axis, and the slope-shaped flow guide grooves are symmetrically distributed around the molten steel gathering area. According to the positive pressure strong nozzle for molten steel transfer, the vortex critical height is reduced, the amount of steel slag involved in molten steel is greatly reduced, the quality of the molten steel is improved, the yield of the molten steel is increased, and the refining treatment cost of the molten steel is reduced.
Description
technical field [0001] The invention relates to the technical field of metallurgy, in particular to a positive pressure nozzle for transferring molten steel. Background technique [0002] In steel production, molten steel is continuously transferred from one container to another, and each container has corresponding slag due to the needs of smelting: there is steel slag in the converter, ladle slag in the ladle, and tundish slag in the tundish. In order to avoid affecting the steel production process and steel quality, it is necessary to minimize the flow of slag into the next container. [0003] The reason why the slag is transferred with the molten steel through the nozzle is due to the vortex phenomenon in the liquid flow. The vortex is a common phenomenon in our life, which is caused by the inconsistency of the flow velocity between adjacent particles during the flow of the fluid. Above the vertical nozzle, when the liquid reaches a certain critical height, a visible v...
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