Channel-type middle bag and temperature increase preheating method thereof

Abstract

The invention relates to a channel-type middle bag and a temperature increase preheating method thereof. The interior of the middle bag is divided into a steel containing cavity and a steel cast cavity through refractory materials, the refractory materials are internally provided with molten steel channels which are connected with the steel containing cavity and the steel cast cavity, and a waterport is formed in the bottom of the steel cast cavity; the steel containing cavity is provided with a steel containing cavity preheating burner nozzle and a steel containing cavity smoke outlet hole,the steel cast cavity is provided with a steel cast cavity preheating burner nozzle and a steel cast cavity outlet hole, and the steel containing cavity is further provided with a steel containing cavity preheating burner nozzle valve and a steel containing cavity smoke outlet hole cover plate; the steel cast cavity is further provided with a steel cast cavity preheating burner nozzle valve and asteel cast cavity smoke outlet hole cover plate, thermocouples are arranged in the steel containing cavity, the steel cast cavity and the water port, and the open-close state of the cover plates is adjusted according to the position temperatures, measured by the thermocouples, of all the refractory materials. According to the channel-type middle bag, gas can circulate and flow in the preheating process of the middle bag, the thermocouples are used for measuring the temperature of a lining of the middle bag, the burner nozzle valves and the smoke outlet hole cover plates of the middle bag can be controlled to be opened or closed accordingly, and the channel and the water port achieves the even and stable temperature increase effect.

Description

technical field [0001] The invention relates to the field of continuous casting, in particular to a channel-type tundish and an alternate heating and preheating method thereof. Background technique [0002] In the initial stage of the development of continuous casting steel technology, the tundish was only used as a storage and distributor for molten steel. With the development of continuous casting technology and the continuous improvement of the quality requirements of casting slabs, the importance of molten steel quality to continuous casting technology has gradually been recognized by people. In order to ensure the smooth running of the continuous casting process and the continuous casting of multiple furnaces, it is necessary to ensure sufficient purity of the molten steel, to control the composition range of the molten steel as precisely as possible, and to maintain a stable temperature of the molten steel for a long enough time and superheat. Therefore, as the last ...

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Problems solved by technology

[0006] (1) The distance between the channels on both sides of the tundish is long, and it is impossible to use a special roaster for baking, so it is difficult to make the temperature reach the temperature required for the molten steel to be poured;

[0007] (2) The nozzle distance of the tundish is relatively long, how to achieve the purpose of the preheating nozzle by cooperating with the baker in the tundish is not covered in the current patent literature;

[0008] In the patent CN104249148B, a channel-type tundish is disclosed, which adopts a differential pressure preheating method, but there are many cavities and channels in this tundish, and the tundish lacks corresponding adjustment and control functions, which is harmful to preheating. less controllable process

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