A cooling device and cooling method for the downcomer of the rh refining furnace in a steel plant

Abstract

The invention provides a cooling device and a cooling device for a declining tube of an RH refining furnace of a steel mill. The cooling device comprises a cooling chamber coating the declining tube, wherein the cooling chamber is in a cylinder shape coiled by a hollow square plate and is welded to the outer wall of the declining tube, and a cold air inlet pipe and a hot air outlet pipe are respectively arranged on the cylinder-shaped cooling chamber; a refractory castable layer is arranged on the outer wall of the cooling chamber. According to the cooling device, the cooling air chamber is welded to the outer part of a steel structure of the declining tube, an air inlet pipe hole and an air outlet pipe hole are formed in the cooling air chamber, and an air flow passage is arranged in the steel structure of the declining tube; when molten steel is fed into the RH refining furnace, the air enters the RH refining furnace through an air inlet, is exhausted from an air outlet through the air passage arranged in the RH refining furnace and takes out heat from the steel structure of the declining tube, so that the declining tube is cooled, the cooling effect is good, and the declining tube can be cooled in a short time.

Description

technical field [0001] The invention provides a vacuum furnace downcomer cooling technology, in particular to a cooling device and a cooling method for the downcomer of a RH refining furnace in a steel plant. Background technique [0002] At this stage, in my country's iron and steel plants, a large number of RH refining methods have been adopted. The RH refining method is called RH vacuum cycle degassing refining method, which was invented by the Germans in 1959. Before the molten steel is treated, the dipping tube is first immersed in the molten steel of the ladle to be treated. The two dipping tubes connected with the vacuum tank, one is an ascending tube and the other is a descending tube. Since the rising tube continuously blows argon into the molten steel, Compared with the downcomer without argon blowing, a higher static pressure difference is generated, so that the molten steel enters from the upcomer and flows to the downcomer through the lower part of the vacuum ta...

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Problems solved by technology

The current general-purpose design has the following problems during use: (1) During the use of the downcomer of the vacuum furnace, the temperature is prone to be too high, which causes the metal shell of the downcomer to turn red, resulting in the structure of the downcomer being easily deformed; (2) Due to the redness of the structure and the effect of high temperature, it is easy to cause annealing and oxidation of the solder joints of the anchor on the structure, resulting in desoldering phenomenon, and the refractory lining of each part loses the tension of the anchor, resulting in cracking and falling off, resulting in the downcomer The refractory material used collapses; (3) The life of the downcomer refers to the number of times it is used during the period from on-line to off-line. Due to the deformation of the shell and the detachment of the refractory lining, the downcomer cannot continue to be used, and the downcomer is reduced. The number of times of use makes the life of the downcomer and the bottom of the furnace asynchronous, and the life of the downcomer is shorter than the life of the furnace, which directly affects the vacuum operation and leads to shutdown for maintenance

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