A rh vacuum refining furnace and vacuum refining system

Abstract

The invention discloses an RH vacuum refining furnace and a vacuum refining system, and belongs to the technical field of secondary steelmaking of molten steel. The vacuum refining system comprises the RH vacuum refining furnace, a steel ladle base, a first air supply device, a second air supply device, a vacuum pump and an alloy hopper. The RH vacuum refining furnace comprises a vacuum chamber and a dip pipe. The dip pipe comprises a center pipe and an outer sleeve. The outer sleeve is an inverted cone frustum-shaped hollow pipe. The area of the upper bottom face of the outer sleeve is larger than that of the lower bottom face of the outer sleeve. The top of the center pipe is fixedly connected with the outer sleeve through a fixing beam, and the center pipe and the outer sleeve are located on the same axis. The center pipe is an ascending pipe and is also an inverted cone frustum-shaped hollow pipe. The area of the upper bottom face of the center pipe is larger than that of the lower bottom face of the center pipe. An annular sleeve formed by the center pipe and the outer sleeve is a descending pipe. According to the RH vacuum refining furnace and the vacuum refining system, the saturation point of gas flow in molten steel of the vacuum refining system is increased, circular flow is also increased, distribution of gas in a molten steel flow field is improved, and thus the refining effect of the molten steel is improved.

Description

technical field [0001] The invention relates to the technical field of molten steel refining outside the furnace, and more specifically, relates to an RH vacuum refining furnace and a vacuum refining system. Background technique [0002] The RH method is an out-of-furnace refining method for molten steel jointly designed and developed by Ruhrstahl and Hereaeus. [1] . The RH method is an important means of refining outside the furnace. It has the functions of degassing, decarburization, deoxidation, uniform composition and temperature of molten steel, and promoting the floating of non-metallic inclusions. The lower part of the RH vacuum refining furnace is equipped with a dipping tube. During the process of refining molten steel in the RH vacuum refining furnace, the lower dipping tube is inserted into the lower part of the ladle steel liquid surface, and the vacuum chamber is vacuumed, and then the rising tube is The lower part blows argon gas into the molten steel as a dr...

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Problems solved by technology

However, the above approach has the following problems: 1) Although increasing the gas supply flow rate increases the circulation flow rate to a certain extent, when the gas supply flow rate is large, the proportion of the gas volume is relatively large, so that the suction efficiency of the bubbles decreases, On the contrary, the circulating flow rate of molten steel is reduced; 2) The diameter of the dipping tube is limited by the size of the ladle. When the size of the ladle has been determined, it is difficult to further increase the diameter of the dipping tube; 3) Vacuumizing the vacuum chamber consumes a lot of energy. It is not economical to reduce the residual pressure of the vacuum chamber to increase the circulation flow

However, this method has a very limited increase in circulation flow

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