A method for reducing the temperature of molten steel in a continuous casting mold

Abstract

This invention discloses a method for reducing the temperature of molten steel in a continuous casting crystallizer, belonging to the field of steelmaking technology. It solves the technical problem of excessively high molten steel temperature entering the crystallizer. The method involves installing a cooling device that fits snugly against the outer wall of the outlet. When molten steel enters the outlet from the ladle, the water flow rate and pressure of the cooling device are controlled according to the flow rate and temperature of the molten steel, achieving rapid cooling by directly removing the heat from the molten steel. The steps are as follows: Step 1: Fit the cooling device onto the outer wall of the outlet and connect the outlet to the ladle using clips; Step 2: Flow water into the cooling device and observe whether there is any leakage at the inlet and outlet. If there is no leakage, proceed to the next step; Step 3: Adjust the water flow rate and pressure of the cooling device to the preset parameters; Step 4: Obtain the flow rate and temperature of the molten steel entering the outlet; Step 5: Adjust the water flow rate and pressure of the cooling device in real time according to the flow rate and temperature of the molten steel.

Description

Technical Field

[0001] This invention relates to the field of steelmaking technology, and more specifically, to a method for reducing the temperature of molten steel in a continuous casting crystallizer. Background Technology

[0002] The molten steel poured in continuous casting must have the characteristics of high temperature, stability and uniformity. If the temperature of the molten steel entering the crystallization is too high, it is easy to cause insufficient thickness of the initial billet shell, and steel leakage is likely to occur after crystallization.

[0003] Ordinary carbon steel casting ladles do not have functions such as argon blowing. The temperature drop of molten steel in the ladle is mainly controlled by the temperature of the previous process. Continuous casting has no effective means to control the temperature of molten steel entering the crystallizer. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a method for reducing the temperature of molten steel in a continuous casting crystallizer.

[0005] The technical solution of the present invention is: a method for reducing the temperature of molten steel in a continuous casting crystallizer, wherein a cooling device is installed on the outer wall of the outlet; when molten steel enters the outlet from the ladle, the water flow rate and water pressure of the cooling device are controlled according to the flow rate and temperature of the molten steel, and the temperature of the molten steel is directly removed by water cooling to achieve the purpose of rapid cooling.

[0006] As a further improvement, the following steps are included:

[0007] Step 1: Fit the cooling device onto the outer wall of the drain outlet and connect the drain outlet to the intermediate package using clips;

[0008] Step 2: Pour water into the cooling device and observe whether there is any leakage at the inlet and outlet of the cooling device. If there is no leakage, proceed to the next step.

[0009] Step 3: Adjust the water flow rate and water pressure into the cooling device to the preset parameters;

[0010] Step 4: Obtain the flow rate and temperature of the molten steel entering the drain outlet;

[0011] Step 5: Adjust the water flow rate and water pressure of the cooling device in real time according to the flow rate and temperature of the molten steel.

[0012] Furthermore, the flow rate of molten steel is determined based on the design size or model of the outlet.

[0013] Furthermore, the temperature of the molten steel is obtained through a temperature sensor, which is installed at the upper end of the outlet or the outlet end of the ladle.

[0014] Furthermore, the corresponding water flow rate and water pressure are pre-calibrated based on the flow rate and temperature of the molten steel, and a water flow regulating meter is prepared.

[0015] The target water flow rate and target water pressure can be obtained by consulting the water flow regulation table based on the actual flow rate and temperature of the molten steel.

[0016] The water flow rate and water pressure of the cooling device are controlled according to the target water flow rate and target water pressure.

[0017] Furthermore, the water pressure of the cooling device should not exceed 1.2 MPa.

[0018] Furthermore, when the temperature sensor detects the temperature of the molten steel, water is supplied to the cooling device after a first set time delay;

[0019] After the continuous steel casting is completed, the cooling device is shut off after a second set time delay.

[0020] Furthermore, the cooling device includes a cooling water jacket, the inner wall of which is provided with a sprue sleeve made of a soft material that is resistant to high temperature and has good thermal conductivity. The sprue sleeve is fitted onto the outer wall of the lower 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.

[0021] Furthermore, the inner cavity of the cooling water jacket is equipped with fins.

[0022] Beneficial effects

[0023] Compared with the prior art, the advantages of this invention are as follows:

[0024] This invention achieves the effect of rapidly cooling molten steel to a specified process temperature by adjusting the water flow rate and water pressure of the cooling device in real time according to the flow rate and temperature of the molten steel. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cooling device in this invention.

[0026] Wherein: 1-outlet, 2-cooling device, 3-cooling water jacket, 4-water inlet sleeve, 5-inlet, 6-outlet, 7-fins. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0028] See Figure 1 A method for reducing the temperature of molten steel in a continuous casting crystallizer involves installing a cooling device 2 that is closely connected to the outer wall of the outlet 1. When molten steel enters the outlet 1, the flow rate and water pressure of the cooling device 2 are controlled according to the flow rate and temperature of the molten steel, so that the temperature of the molten steel is directly carried away by water cooling, thereby achieving the purpose of rapid cooling.

[0029] This method includes the following steps:

[0030] Step 1: Fit the cooling device 2 onto the outer wall of the drain outlet 1, and connect the drain outlet 1 to the intermediate package using clips;

[0031] Step 2: Pour water into cooling device 2 and observe whether there is any leakage at the water inlet 5 and water outlet 6 of cooling device 2. If there is no leakage, proceed to the next step.

[0032] Step 3: Adjust the water flow rate and water pressure of the cooling device 2 to the preset parameters to improve the responsiveness of subsequent real-time adjustments;

[0033] Step 4: Obtain the flow rate and temperature of the molten steel entering outlet 1;

[0034] Step 5: Adjust the water flow rate and water pressure of cooling device 2 in real time according to the flow rate and temperature of molten steel.

[0035] In this embodiment, the flow rate of molten steel is determined according to the design size or model of the outlet 1, as can be found in the design manual or product manual of outlet 1.

[0036] The temperature of the molten steel is obtained by a temperature sensor, which is installed at the upper end of the outlet 1 or the outlet end of the ladle.

[0037] Preferably, the corresponding water flow rate and water pressure are pre-calibrated according to the flow rate and temperature of the molten steel, that is, different flow rates and temperatures of molten steel correspond to different water flow rates and water pressures, and a water flow regulation table is made.

[0038] The target water flow rate and target water pressure can be obtained by consulting the water flow regulation table based on the actual flow rate and temperature of the molten steel.

[0039] The water flow rate and water pressure of the cooling device 2 are controlled according to the target water flow rate and target water pressure.

[0040] The water pressure of cooling device 2 is no greater than 1.2 MPa, and the water flow rate is generally controlled at 100 t / h.

[0041] Furthermore, when the temperature sensor detects the temperature of the molten steel, water is supplied to the cooling device 2 after a first set time delay. Since the initial state of the outlet 1 is room temperature, a certain amount of heat will be lost when the front end of the molten steel passes through the outlet 1. The purpose of supplying water to the cooling device 2 after a first set time delay is to prevent the front end of the molten steel from losing heat too quickly, thereby causing the temperature to drop too much and affecting the continuous casting quality.

[0042] After the continuous steel casting is completed, the water supply to the cooling device 2 is stopped after a second set time, mainly to quickly cool down the drain outlet 1.

[0043] The cooling device 2 includes a cooling water jacket 3. The inner wall of the cooling water jacket 3 is provided with a sprue sleeve 4 made of a soft material with high temperature resistance and good thermal conductivity. The sprue sleeve 4 is fitted onto the outer wall of the lower sprue 1. The lower end of the cooling water jacket 3 is provided with a water inlet 5, and the upper end of the cooling water jacket 3 is provided with a water outlet 6. The water inlet 5 is connected to a variable frequency water pump in an external cooling water tank. The inner cavity of the cooling water jacket 3 is provided with fins 7, which can improve heat conduction.

[0044] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for reducing the temperature of molten steel in a continuous casting crystallizer, characterized in that, A cooling device (2) is installed on the outer wall of the outlet (1) and is fitted and connected. When the molten steel enters the outlet (1), the flow rate and water pressure of the cooling device (2) are controlled according to the flow rate and temperature of the molten steel. The temperature of the molten steel is directly carried away by water cooling to achieve the purpose of rapid cooling. Includes the following steps: Step 1: Place the cooling device (2) on the outer wall of the drain (1) and connect the drain (1) to the middle bag through a buckle; Step 2: Pour water into the cooling device (2) and observe whether there is any leakage at the water inlet (5) and water outlet (6) of the cooling device (2). If there is no leakage, proceed to the next step. Step 3: Adjust the water flow rate and water pressure of the cooling device (2) to the preset parameters; Step 4: Obtain the flow rate and temperature of the molten steel entering the drain outlet (1); Step 5: Adjust the water flow rate and water pressure of the cooling device (2) in real time according to the flow rate and temperature of the molten steel; The corresponding water flow rate and water pressure are calibrated in advance based on the flow rate and temperature of the molten steel, and a water flow regulating meter is made. The target water flow rate and target water pressure can be obtained by consulting the water flow regulation table based on the actual flow rate and temperature of the molten steel. The water flow rate and water pressure of the cooling device (2) are controlled according to the target water flow rate and target water pressure; The water pressure of the cooling device (2) shall not exceed 1.2 MPa; When the temperature sensor detects the temperature of the molten steel, water is supplied to the cooling device (2) after a first set time delay; After the continuous steel casting is completed, the cooling device (2) is stopped from supplying water after a second set time delay; The cooling device (2) includes a cooling water jacket (3). The inner wall of the cooling water jacket (3) is provided with a water inlet sleeve (4) made of a soft material that is resistant to high temperature and has good thermal conductivity. The water inlet sleeve (4) is fitted onto the outer wall of the water outlet (1). The lower end of the cooling water jacket (3) is provided with a water inlet (5) and the upper end of the cooling water jacket (3) is provided with a water outlet (6). The inner cavity of the cooling water jacket (3) is provided with fins (7).

2. The method for reducing the temperature of molten steel in a continuous casting crystallizer according to claim 1, characterized in that, The flow rate of molten steel is determined based on the design size or model of the outlet (1).

3. The method for reducing the temperature of molten steel in a continuous casting crystallizer according to claim 1, characterized in that, The temperature of the molten steel is obtained by a temperature sensor, which is installed at the upper end of the drain outlet (1) or the outlet end of the ladle.

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