A side spray method for cooling after rolling of hot-rolled strip

Abstract

A side spraying method for hot-rolled strip cooling after rolling, comprising the following steps: a) After each post-rolling cooling section, a side spraying device is arranged, and the side spraying devices are arranged alternately along both sides of the output roller table, and the side spraying device includes At least two spray members, each spray member includes a spray pipe and its upper nozzle, the spray pipes are arranged vertically side by side along the strip running direction; the coverage of adjacent nozzles partially overlaps, and each nozzle forms a total spray water coverage coverage The width of the entire output roller table; a water spray collection device is installed on the other side of the output roller table corresponding to the side spray device, so that the side spray water falls into the collection device; b) The control mode of the side spray device is opened in pairs, that is, the output roller table There must be one side sprinkler on each side at the same time. The side spraying method of the invention can effectively purge residual water on the surface of steel strips with different widths and specifications, improve cooling uniformity, reduce splashing as much as possible, and avoid adverse effects on the environment and electrical equipment.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a side spraying method for cooling hot-rolled strip steel after rolling. Background technique [0002] At present, the post-rolling cooling area of ​​hot continuous rolling generally adopts the tilting rack type laminar flow cooling or pressurized direct injection cooling device. The cooling water of each tilting rack falls on the upper surface of the strip and flows in a state of disorder, which cannot be effectively Excluded, forming residual water on the surface, resulting in uneven cooling; at the same time, due to the fast moving speed of the strip, part of the cooling water will rush into the adjacent tipping frame area as the strip moves forward, destroying its cooling water state, resulting in cooling The effect is not good and the cooling is uneven; when the cooling water encounters the high-temperature steel plate, a steam film will be formed, which hinders the direct c...

AI Technical Summary

Problems solved by technology

[0004] 1) Adverse effects caused by side spray water splash

[0005] Due to the fast moving speed of the strip steel, the impact force of the residual water on the surface is relatively large, and the horizontal jet dewatering will inevitably cause a violent collision between the side jet water and the residual water, which will produce a large amount of splashing water, such as figure 1 As shown, especially in the area near the nozzle, the collision is more intense, and the splashed water is high and far away, affecting the surrounding environment

And a large amount of splashing water will cause electrical equipment failures such as motors, so that some production lines are forced to stop or seldom turn on the side spray where there are motors, resulting in uneven cooling on both sides of the strip

At the same time, the residual water with a certain impact force easily crosses the water wall and enters the front of the strip during lateral side spraying, resulting in uneven cooling surface

Since baffles are installed on both sides of the cooling roller table, splashing and backflow will be caused after the lateral water spray collides with the baffles, especially for wider strip steel, the gap between the strip steel and the baffles is small, It is difficult to remove the side spray water quickly, and it will splash back and flow back to the surface of the strip, which not only affects the effect of the side spray, but also causes uneven cooling

[0006] 2) It is difficult to take into account the water removal effect of strip steel with different widths

The rectangular collection port of the device is too large, without anti-collision design, and the strip head is easy to get stuck in the collection port when it deviates, causing scrap steel

[0015] Although the above patents have improved the original side spray effect to a certain extent, they cannot effectively solve the problem that the side spray water and residual water violently collide with each other and cause splashing to affect the surrounding environment and electrical equipment. Some devices have potential safety hazards, and some The device is too complicated

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