STRAIGHT BARREL TYPE VACUUM REFINING DEVICE AND METHOD FOR USE THE SAME

摘要

The present invention discloses a straight barrel type vacuum refining device comprising a vacuum chamber and a snorkel; during the vacuum refining the snorkel is inserted into the molten steel of the steel ladle, it is characterized in that, disposing a circulating tube being on the circumference of said snorkel, and blowing argon gas into the snorkel through the nozzles on an inner wall of a circulating tube; said circulating tubes are disposed in layers, the nozzles on the circulating tubes in the same layer are individually controlled as 2-6 in one group; disposing an eccentric gas permeable brick at the bottom of said steel ladle, and blowing argon gas into the steel ladle through the eccentric gas permeable brick, driving a circulating flow molten steel between the steel ladle and the vacuum chamber by using different blowing flow rate combinations of a steel ladle bottom blowing and each individually controlled unit of the circulating tube blowing system. The operation method of the straight barrel type vacuum refining device is: the vacuum refining process uses a combined blown mode of steel ladle bottom eccentric gas permeable brick and the circulating tube of the snorkel, during decarburization the bottom blowing and the circulating tube on the same side as the bottom blowing are strong blowing, and the circulating tube on the other side is weak blowing; during desulfurization, the bottom blowing is strong blowing, and the circulating tubes around the snorkel are all weak blowing.