A three-hole dipping tube for a single-nozzle refining furnace

Abstract

The invention relates to a three-hole dipping pipe of a single-snorkel refining furnace. The three-hole dipping pipe comprises a pipe-shaped outer wall and an internal retaining wall. The internal retaining wall is of a T-shaped or Y-shaped structure, and the pipe-shaped outer wall is divided into an ascending hole and a descending hole with the same area. The ascending hole is provided with a plurality of ascending gas outlets. According to the dipping pipe, based on the size of an existing steel ladle and vacuum chamber and the conditions of a vacuum pump, the number and equivalent diameter of ascending pipes can be increased so as to increase circular flow, interference of ascending steel liquid and descending steel liquid is reduced, the refining efficiency is improved, the supporting strength of the center portion of the internal retaining wall can be enhanced, the service life of the dipping pipe is prolonged, and the refractory material cost is reduced.

Description

technical field [0001] The invention belongs to the field of vacuum degassing devices used for refining outside steelmaking furnaces in the metallurgical industry, and relates to a three-hole dipping tube of a single-nozzle refining furnace. Background technique [0002] In the field of refining outside the furnace, the vacuum refining equipment for molten steel mainly includes RH, single nozzle refining furnace, VD and other devices. RH refers to an integral or split vacuum chamber. When processing molten steel, all metallurgical reactions are carried out in the vacuum chamber. The bottom of the RH is two circular dipping tubes of the same size, which are the ascending pipe and the descending pipe. The upper part is connected with a hot bending pipe, and the hot bending pipe is connected with a vacuum system, and each part is combined into a set of vacuum refining device. Its working principle is to blow argon gas through the gas outlet of the rising tube, and at the same ...

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Problems solved by technology

[0019] 5) The existing RH vacuum cycle degassing refining device cannot effectively solve the problem of dead zone in the ladle

However, due to the unreasonable setting position and structure of the middle internal retaining wall in the single nozzle dipping tube, the flow rate of the molten steel in the ascending pipe and the descending pipe is basically the same, and the interference between the ascending liquid steel and the descending liquid steel is still relatively large, and the circulation efficiency It is not high enough. At the same time, the horizontal length of the internal retaining wall in the middle is relatively long, and its central part bears the weight of the retaining wall and the impact force of molten steel. There is a risk of deformation and collapse leading to a short service life of the single nozzle dipping tube

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