System and method for preventing continuous casting secondary cooling nozzle from being blocked

Abstract

The invention relates to a system and method for preventing a continuous casting secondary cooling nozzle from being blocked, and belongs to the technical field of steelmaking continuous casting. Before the pulling speed of a continuous casting machine is reduced to zero, a pneumatic flow adjusting valve arranged on a secondary cooling water pipeline is closed, secondary cooling water is closed, and cooling is paused; a middle pipeline communicating with a compressed air pipeline and the secondary cooling water pipeline is arranged between the compressed air pipeline and the secondary coolingwater pipeline, a rapid cut-off valve is arranged on the middle pipeline, compressed air is introduced into the compressed air pipeline, the rapid cut-off valve is opened, the compressed air in the compressed air pipeline enters the secondary cooling water pipeline through the middle pipeline, and residual water in the secondary cooling water pipeline is discharged; before the pulling speed is increased, the compressed air is closed, and the rapid cut-off valve is closed; and the pneumatic flow adjusting valve is opened, the secondary cooling water is opened, the pulling speed is increased, and cooling is continued. According to the system and method, the situation that the nozzle is blocked after water remaining in the water pipeline forms water scale is effectively prevented, the uniformity of secondary cooling is guaranteed, the utility period of the nozzle is prolonged, and the maintenance cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, and relates to a system and a method for preventing clogging of a continuous casting secondary cooling nozzle. Background technique [0002] In the process of continuous casting and steelmaking, the process of casting slab from the crystallizer to complete cooling and solidification is called secondary cooling. Most of the heat of the slab in the secondary cooling zone (referred to as the secondary cooling zone) is taken away by cooling water. Among them, the air mist cooling method is widely used in slab and billet continuous casting due to its good uniformity and large adjustment ratio. In the process of continuous casting, sometimes it is necessary to reduce the casting speed to zero. For example, when changing the tundish quickly, it is necessary to reduce the casting speed. Close the cooling water and air valve of the secondary cooling, and suspend cooling. At th...

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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a system and method for preventing the clogging of the continuous casting secondary cooling nozzle, so as to solve the problem of the residual water in the pipeline being baked at high temperature when the casting speed and the secondary cooling are suspended during continuous casting production. The technical problem of fouling at the nozzle and clogging the nozzle

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