Rapid cooling process for annealing

Abstract

The invention relates to the technical field of cold-rolled sheet production, in particular to a rapid cooling process for annealing, which is realized through a rapid cooling device. The rapid cooling device comprises nozzles, wherein the nozzles comprise main nozzles and auxiliary nozzles, one auxiliary nozzle is arranged between every two adjacent main nozzles, and the main nozzles and the auxiliary nozzles are obliquely arranged above a cold spraying plate; the auxiliary nozzles are located above the rear portions of the spraying directions of the two adjacent main nozzles; and both the main nozzles and the auxiliary nozzles spray a cooling medium to the cold-rolled sheet in an inclined spraying type cold spraying mode, and the spraying pressure of the auxiliary nozzles is 1 / 4-1 / 3 of the spraying pressure of the main nozzles. According to the rapid cooling process, the appearance of a warm (gas) 'barrier layer 'is avoided or reduced to the maximum extent, the cold spraying quality and efficiency are improved, and the influence of 'black holes' of the vortexes of the main nozzles can be supplemented or compensated.

Description

technical field [0001] The invention relates to the technical field of cold-rolled plate production, in particular to a rapid cooling process for annealing. Background technique [0002] Annealing (to eliminate internal stress) is an indispensable process for iron and steel enterprises and crude steel reprocessing enterprises when rolling various types of plates, and "spray cooling" is an indispensable process for annealing equipment. Hot rolling, especially the continuous bright annealing of cold-rolled plates, uses the "spray cooling" process to avoid the "oxidation process" to the greatest extent and obtain the best surface quality. The usual continuous bright annealing equipment at home and abroad, whether it is vertical or horizontal, its "spray cooling" method is "direct injection" spray cooling. After finishing the surface of the plate, in order to achieve the purpose of instant cooling. But this kind of "spray cooling" has a serious defect that the vertical spray c...

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Problems solved by technology

But this kind of "spray cooling" has a serious defect that the vertical spray cooling airflow often suppresses or affects the evacuation and outflow of the "tail gas" after spray cooling, and the interference between each other will form a "barrier layer" on the surface of the plate, which seriously affects the interference. The normal operation of "spray cooling" and the effect of spray cooling; and the nozzles on one side can only be set to one row instead of multiple rows. The more rows, the thicker the "barrier layer" and the worse the spray cooling effect

In addition, this method of "spray cooling" will also cause another defect: when two adjacent nozzles "spray cooling", a vortex "black hole" will be formed at the intersection of the airflow blowing the plate (such as Picture 1 Note), that is to say, when spraying the plate (one side) N nozzles are needed, and N-1 vortex "black holes" will be formed to affect the spray cooling effect, which will greatly affect or reduce the overall quality of "spray cooling"

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