CN-116673451-B - Method for reducing molten steel temperature of continuous casting crystallizer

Abstract

The invention discloses a method for reducing the temperature of molten steel of a continuous casting crystallizer, which belongs to the technical field of steelmaking and solves the technical problem that the temperature of molten steel entering the crystallizer is too high; when the ladle molten steel enters the water outlet, the water flow and the water pressure of the cooling device are controlled according to the flow and the temperature of the molten steel, and the temperature of the molten steel is directly taken away through water cooling so as to achieve the aim of rapid cooling. The method comprises the steps of sleeving a cooling device on the outer wall of a water outlet, connecting the water outlet with a tundish through a buckle, introducing water into the cooling device, observing whether water leaks exist in a water inlet and a water outlet of the cooling device, if the water leaks, executing the next operation, adjusting the water flow and the water pressure of the water inlet into the cooling device to reach preset parameters, obtaining the flow and the temperature of molten steel entering the water outlet, and adjusting the water flow and the water pressure of the cooling device in real time according to the flow and the temperature of the molten steel.

Inventors

• LIU XUEJIA
• LUO BIN
• NIE ZHIBIN

Assignees

• 阳春新钢铁有限责任公司

Dates

Publication Date

20260505

Application Date

20230628

Claims (3)

1. 1. A method for reducing the molten steel temperature of a continuous casting crystallizer is characterized in that a cooling device (2) in fit connection is arranged on the outer wall of a water outlet (1), when a tundish molten steel enters the water outlet (1), the water flow and the water pressure of the cooling device (2) are controlled according to the flow and the temperature of the molten steel, and the molten steel temperature is directly taken away through water cooling, so that the aim of rapid cooling is fulfilled; The method comprises the following steps: step one, sleeving a cooling device (2) on the outer wall of a water outlet (1), and connecting the water outlet (1) with a tundish through a buckle; step two, introducing water into the cooling device (2), observing whether water leaks at a water inlet (5) and a water outlet (6) of the cooling device (2), and if the water leaks, executing the next operation; Step three, adjusting the water flow rate and the water pressure of the water inlet and cooling device (2) to reach preset parameters; Step four, obtaining the flow and the temperature of molten steel entering a water outlet (1); fifthly, regulating the water flow rate and the water pressure of the cooling device (2) in real time according to the flow rate and the temperature of the molten steel; Corresponding water flow and water pressure are calibrated in advance according to the flow and temperature of molten steel, and a water flow regulating meter is manufactured; inquiring a water flow regulating table according to the actual flow and temperature of molten steel to obtain a target water flow and a target water pressure; controlling the water flow rate and the water pressure of the cooling device (2) according to the target water flow rate and the target water pressure; The water pressure of the cooling device (2) is not more than 1.2Mpa; When the temperature sensor detects the temperature of molten steel, water is fed to the cooling device (2) after a first set time is delayed; After the continuous casting steel is finished, delaying for a second set time and stopping water supply to the cooling device (2); the cooling device (2) comprises a cooling water jacket (3), a water gap sleeve (4) made of a soft material with high temperature resistance and good heat conductivity is arranged on the inner wall of the cooling water jacket (3), the water gap sleeve (4) is sleeved on the outer wall of the water outlet (1), a water inlet (5) is arranged at the lower end of the cooling water jacket (3), and a water outlet (6) is arranged at the upper end of the cooling water jacket (3); the inner cavity of the cooling water jacket (3) is provided with fins (7).
2. 2. Method for reducing the temperature of molten steel in a continuous casting mould according to claim 1, characterized in that the flow of molten steel is determined according to the design size or model of the nozzle (1).
3. 3. A method for reducing the temperature of molten steel in a continuous casting mold according to claim 1, characterized in that the temperature of the molten steel is obtained by means of a temperature sensor mounted at the upper end of the nozzle (1) or at the outlet end of the tundish.

Description

Method for reducing molten steel temperature of continuous casting crystallizer Technical Field The invention relates to the technical field of steelmaking, in particular to a method for reducing the temperature of molten steel in a continuous casting crystallizer. Background The continuous casting molten steel in continuous casting steel has the characteristics of high temperature, stability and uniformity, and the excessive high temperature of molten steel entering crystallization easily causes insufficient thickness of a primary green shell, and the problem of steel leakage easily occurs after crystallization. The common carbon steel casting tundish does not have the functions of argon blowing and the like, the temperature drop of the ladle molten steel is mainly controlled by the temperature of the previous working procedure, and continuous casting has no effective control means on the temperature of the molten steel entering a crystallizer. Disclosure of Invention The invention aims to solve the technical problems in the prior art and aims to provide a method for reducing the temperature of molten steel in a continuous casting crystallizer. The technical scheme is that the method for reducing the temperature of molten steel of the continuous casting crystallizer is characterized in that a cooling device in fit connection is arranged on the outer wall of a water outlet, when the ladle molten steel enters the water outlet, the water flow and the water pressure of the cooling device are controlled according to the flow and the temperature of the molten steel, and the temperature of the molten steel is directly taken away through water cooling, so that the aim of rapid cooling is fulfilled. As a further improvement, the method comprises the following steps: Step one, sleeving a cooling device on the outer wall of a water outlet, and connecting the water outlet with a tundish through a buckle; step two, introducing water into the cooling device, observing whether water leaks at a water inlet and a water outlet of the cooling device, and if the water leaks, executing the next operation; Step three, adjusting the water flow rate and the water pressure of the water inlet and cooling device to reach preset parameters; step four, obtaining the flow and the temperature of molten steel entering a water outlet; and fifthly, regulating the water flow and the water pressure of the cooling device in real time according to the flow and the temperature of the molten steel. Further, the flow rate of the molten steel is determined according to the design size or model of the drain opening. Further, the temperature of the molten steel is obtained by a temperature sensor installed at the upper end of the drain port or the outlet end of the tundish. Further, corresponding water flow and water pressure are calibrated in advance according to the flow and temperature of molten steel, and a water flow regulating meter is manufactured; inquiring a water flow regulating table according to the actual flow and temperature of molten steel to obtain a target water flow and a target water pressure; and controlling the water flow rate and the water pressure of the cooling device according to the target water flow rate and the target water pressure. Further, the water pressure of the cooling device is not more than 1.2Mpa. Further, when the temperature sensor detects the temperature of the molten steel, water is fed to the cooling device after the first set time is delayed; And after the continuous casting steel is finished, delaying the second set time, and stopping water supply to the cooling device. Further, the cooling device comprises a cooling water jacket, the inner wall of the cooling water jacket is provided with a water gap sleeve made of soft materials with high temperature resistance and good heat conductivity, the water gap sleeve is sleeved on the outer wall of the water outlet, the lower end of the cooling water jacket is provided with a water inlet, and the upper end of the cooling water jacket is provided with a water outlet. Further, the inner cavity of the cooling water jacket is provided with fins. Advantageous effects Compared with the prior art, the invention has the advantages that: the invention can achieve the effect of rapidly cooling the molten steel to the appointed process temperature by adjusting the water flow and the water pressure of the cooling device in real time according to the flow and the temperature of the molten steel. Drawings Fig. 1 is a schematic structural view of a cooling device in the present invention. Wherein, the device comprises a 1-water outlet, a 2-cooling device, a 3-cooling water jacket, a 4-water outlet sleeve, a 5-water inlet, a 6-water outlet and 7-fins. Detailed Description The invention will be further described with reference to specific embodiments in the drawings. Referring to fig. 1, a cooling device 2 is arranged on the outer wall of a water outlet 1 in a fitting connectio