Jet flow cooling method and device in narrow slit water jacket passage of steel plate

Abstract

The invention discloses a jet flow cooling method in a narrow slit water jacket passage of a steel plate, wherein a flat rectangular hollow tubular water jacket is sleeved on the periphery of a hot rolled steel plate in a cooling region, narrow slit passages are formed between the upper and lower walls of the water jacket and the hot rolled steel plate, inclined jet flow nozzles with inward openings are installed on the upper wall and the lower wall of the water jacket, cooling water is injected into the narrow slit passages through the jet flow nozzles in an inclination manner to form vapor-liquid two-phase flow with the vapor generated on the surface of the hot rolled steel plate, the cooling water flows out from the ports of the narrow slit passages and flows into a circulating water storage tank arranged at the port of the water jacket; and the invention further provides a cooling device of executing the method. The method disclosed by the invention achieves the two technical effects of quick cooling and uniform cooling at the same time, and the method has the advantages of low water consumption and convenience in cooling capability adjustment, and the device is simple and convenient in installation.

Description

technical field [0001] The invention relates to a cooling method and device for a hot-rolled steel plate, in particular to a method and a device for jet cooling in a narrow slit water jacket channel for on-line production of a hot-rolled steel plate, and belongs to the technical field of metal processing. Background technique [0002] Controlled rolling and controlled cooling technology is a new technology of rolling steel production in continuous casting system newly developed at home and abroad for more than 20 years. With the application of modern equipment and detection and control methods in steel rolling production, the controlled rolling and controlled cooling technology is becoming more and more perfect, especially in the production of medium and thick steel plates. Controlled rolling has a great impact on the output of the rolling mill, so each plate manufacturer has made every effort to develop a cross-rolling method suitable for its own factory conditions, and equ...

AI Technical Summary

Problems solved by technology

At present, iron and steel manufacturers at home and abroad almost without exception use jet (jet) impact boiling technology to cool the rolled high-temperature steel plate, but jet cooling also has two shortcomings: one is large water consumption and power consumption; two It is difficult to achieve uniform cooling

However, this method also has the disadvantages of large water demand and difficult control of the cooling rate of the upper and lower surfaces.

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