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.