Vacuum refining equipment outside the furnace, referred to as VD / VOD furnace, its working principle is: the smelting of crude steel into the molten steel bag, and then into the vacuum tank, then add the appropriate alloy composition of fine-tuning, Vacuum pump, the vacuum tank system pressure drop to a set vacuum, in the bottom of the package argon mixing process, the full mixing of molten steel and slag to achieve the purpose of pure steel, while under the action of the vacuum, Removal of liquid steel in the H, N, O and other harmful gases, to improve the quality of the final product and testing pass rate. VD / VOD furnace main equipment from the ladle, vacuum tank, vacuum system, oxygen system (VOD, VD not), argon blowing system, automatic feeding system, temperature sampling system and process instrumentation and other components. The core technology of the equipment is VD / VOD furnace vacuum pump system. But the user generally the following three major problems:
1, maintenance cleaning time is long, not complete, unsafe;
2, due to maintenance can not keep up, resulting in low vacuum, reducing the quality of molten steel;
3, high steam consumption.
Our company has independent intellectual property rights VD / VOD dedicated steam injection system (3 +2 type, 3 +3 type and 3 +1 water ring pump) series of products, for 20 tons to 150 tons VD / VOD furnace, its innovation Of the ultra-high-speed nozzle design, with high efficiency, energy-saving excellent features. The average steam consumption is less than 10t / h; 3 +1 + water ring pump vacuum system, the average steam consumption is less than 6t / h, dropped to the lowest level in the world. System minimum vacuum stability in 10Pa ~ 45Pa. The vacuum pump adopts the structure of concave and convex flange, which realizes the automatic alignment of the nozzle and simplifies the debugging of the nozzle. The main vacuum pump is placed horizontally (patented) and lifted with an electric hoist, enabling rapid replacement of the pump body. To achieve offline maintenance maintenance cleaning, reducing maintenance shutdown cleaning time. To solve the current user of the three major problems:
Through the improvement of original VD system of Wuyang Iron and Steel Company, the H content of molten steel after vacuum treatment of the VD furnace is below 1.0PPm, among which the qualified rate of first grade testing is above 99.86%. Production of the highest quality alternative to import products, such as Olympic venues "Bird's Nest" "Water Cube" steel; Shanghai "Oriental Pearl Tower" main structural steel; aerospace equipment steel; Shanghai Zhenhua Port Machinery supply 30 Almost every monopoly of the domestic high-rise buildings, bridges, military armor and ship steel; compared with other domestic and foreign VD system, the indicators far ahead, its energy consumption is only equivalent to similar equipment 1/3, maintenance The cost can be reduced by 50%. The system is simple, practical and efficient.
Energy-saving VD furnace (3 + 1 + water ring pump) Characteristic table:
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Serial number
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name
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performance
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1
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Single furnace capacity
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40～150t
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2
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Average processing period
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≤30 min
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3
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Reaching the deep vacuum time
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≤7min
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4
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Deep vacuum
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25Pa～45Pa
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5
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Hydrogen content
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≤1.5PPm
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6
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Steam consumption
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≤6 t/h
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7
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Cooling water consumption
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460～650 t/h
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