Device and method for baking covering slag through tundish baking flue gas waste heat

Abstract

The invention relates to a device and a method for baking casting powder by utilizing tundish baking flue gas waste heat, and belongs to auxiliary equipment in the steelmaking continuous casting process in the metallurgical industry. According to the technical scheme, a baking box body (10) is provided with a feeding port (12) and a discharging port (14), and the baking box body (10) is connected with an air inlet metal hose (9) and an air outlet metal hose (13); the motor (2) is in driving connection with a rotating shaft (8) through a gear transmission mechanism, the rotating shaft (8) is arranged in the baking box body (10), and blades (11) are arranged on the rotating shaft (8); a jack (15) is arranged at the bottom of the baking box body (10), and the baking box body (10) is rotationally connected to the supporting frame (17) through supporting rollers (18). The method has the beneficial effects that flue gas waste heat generated during tundish baking is used for baking the casting powder, and reutilization of the flue gas waste heat is achieved; and through stirring, the casting powder is uniformly heated, and the phenomena of caking, decarburization and the like of the casting powder in the baking process are avoided.

Description

Technical Field

[0001] The invention relates to a device and a method for baking protective slag by utilizing the residual heat of baking smoke from a tundish, and belongs to auxiliary equipment for a steelmaking continuous casting process in the metallurgical industry. Background Art

[0002] In continuous casting production, mold protection slag can not only ensure the smooth production of continuous casting, but also has the functions of absorbing inclusions, heat preservation, etc., and improves the quality of continuous casting billets. The protection slag needs to be stored in a dry place, otherwise it will absorb moisture in the air and form agglomerates, affecting subsequent continuous casting production, causing adhesion or steel leakage during the continuous casting process. Therefore, the protection slag or steel grade requirements need to be baked before use to reduce the internal moisture.

[0003] At present, the baking of protective slag is mainly carried out by the heat generated by the combustion of coal gas, etc., which consumes a lot of coal gas, and there is a waste of resources caused by incomplete combustion of coal gas and residual heat. In the continuous casting process, the middle package is mainly baked with coal gas, etc., and the baking time is long. In this process, the incomplete combustion of coal gas and the residual heat generated after baking cannot be effectively utilized, resulting in a certain waste of resources. Summary of the invention

[0004] The object of the present invention is to provide a device and method for baking protective slag using the waste heat of flue gas during baking of the tundish, aiming to use the waste heat of flue gas during baking of the tundish to bake the protective slag, thereby realizing the reuse of the waste heat of flue gas and saving the consumption of baking energy; by stirring, the protective slag is heated evenly, avoiding the phenomenon of slag agglomeration and decarbonization during baking.

[0005] The technical solution to solve the above technical problems is: A device for baking protective slag using the residual heat of smoke from baking a middle bag, comprising a motor, a rotating shaft, an air inlet metal hose, a baking box, blades, a feed port, an air outlet metal hose, a discharge port, a jack, a support frame and a support roller, wherein the baking box is provided with a feed port and a discharge port, and the baking box is respectively connected to the air inlet metal hose and the air outlet metal hose; the motor is drivingly connected to the rotating shaft through a gear transmission mechanism, the rotating shaft is arranged inside the baking box, and blades are arranged on the rotating shaft; a jack is provided at the bottom of the baking box, and the baking box is rotatably connected to the support frame through support rollers.

[0006] The feed inlet is arranged at the top of the baking box body, and the discharge outlet is arranged at the bottom of one side of the baking box body.

[0007] The air inlet metal hose and the air outlet metal hose are respectively located on two sides of the baking box body.

[0008] The supporting roller is close to the discharging port of the baking box, and the jack is far away from the discharging port of the baking box.

[0009] The blades on the rotating shaft are three evenly arranged.

[0010] The gear transmission mechanism includes a connecting shaft, gear one and gear two, gear two is fixed on the rotating shaft through nut two, gear one is fixed on the connecting shaft through nut one, gear one and gear two are meshed, and the connecting shaft is connected to the output shaft of the motor.

[0011] A method for baking protective slag using the residual heat of flue gas from baking a middle bag, using the device for baking protective slag using the residual heat of flue gas from baking a middle bag as defined above, and operating according to the following steps: a. Add the protective slag to be baked into the baking box through the feed port; b. Start the motor and drive the rotating shaft and blades to stir the protective slag in the baking box through the gear transmission mechanism; c. The tundish baking flue gas is introduced into the baking box through the air inlet metal hose, and the protective slag is baked using the residual heat of the flue gas. The baked flue gas is discharged through the air outlet metal hose; d. After the protective slag is baked, turn off the motor, start the jack, tilt the baking box and pour out the protective slag from the discharge port.

[0012] The beneficial effects of the present invention are as follows: the present invention utilizes the flue gas waste heat generated by the tundish baking to bake the protective slag, thereby realizing the reuse of the flue gas waste heat and saving the consumption of baking energy; the protective slag in the baking box is stirred by the impeller driven by the motor, so that the protective slag in the baking box is evenly heated, thus avoiding the agglomeration and decarbonization of the protective slag during the baking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front view of the structure of the present invention; Figure 2 It is a cross-sectional view of the structure of the present invention taken along line AA; Figure 3 It is a left side cross-sectional view of structure BB of the present invention; In the figure: base 1, motor 2, connecting shaft 3, gear one 4, nut one 5, nut two 6, gear two 7, rotating shaft 8, air inlet metal hose 9, baking box 10, blades 11, feed port 12, air outlet metal hose 13, discharge port 14, jack 15, support plate 16, support frame 17, support roller 18. DETAILED DESCRIPTION

[0014] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0015] See attached Figure 1-3A device for baking protective slag using the residual heat of smoke from baking a middle bag comprises a motor 2, a rotating shaft 8, an air inlet metal hose 9, a baking box 10, blades 11, a feed port 12, an air outlet metal hose 13, a discharge port 14, a jack 15, a support frame 17 and a support roller 18. The baking box 10 is provided with a feed port 12 and a discharge port 14, and the baking box 10 is respectively connected to the air inlet metal hose 9 and the air outlet metal hose 13; the motor 2 is driven and connected to the rotating shaft 8 through a gear transmission mechanism, the rotating shaft 8 is arranged inside the baking box 10, and the rotating shaft 8 is provided with blades 11; a jack 15 is provided at the bottom of the baking box 10, and the baking box 10 is rotatably connected to the support frame 17 through the support roller 18.

[0016] In this embodiment, the device comprises a base 1, a motor 2, a connecting shaft 3, a gear 1 4, a nut 1 5, a nut 2 6, a gear 2 7, a rotating shaft 8, an air inlet metal hose pipe 9, a baking box 10, blades 11, a feed port 12, an air outlet metal hose pipe 13, a discharge port 14, a jack 15, a support plate 16, a support frame 17 and a support roller 18, wherein: The motor 2, the connecting shaft 3, the gear 1 4 and the nut 1 5 are interconnected to form a motor transmission device; the nut 2 6, the gear 2 7, the rotating shaft 8 and the blade 11 form a protective slag stirring device; the baking box body 10, the feed port 12, the discharge port 14 and the supporting roller 18 form a protective slag baking box as a whole; the supporting plate 16 and the supporting frame 17 form a protective slag baking box supporting device; the motor transmission device and the protective slag stirring device are connected through the gear 1 4 driving the gear 2 7.

[0017] The motor 2 is connected to the connecting shaft 3, the connecting shaft 3 is fixed to the gear 4 using a nut 5, and the motor transmission device is placed on the base 1.

[0018] The gear 2 7 and the rotating shaft 8 are connected and fixed by using the nut 2 6 , and the blades 11 are welded on the rotating shaft 8 to form an impeller, and the impeller is placed in the baking box 10 .

[0019] The feed port 12, the discharge port 14 and the support roller 18 are respectively welded to the baking box 10, the air inlet metal hose pipe 9 and the air outlet metal hose pipe 13 are connected to the baking box 10, and the support plate 16 and the support frame 17 are welded together by steel plates. The jack 15 is set at the bottom of the baking box 10.

[0020] The method for baking protective slag by utilizing the residual heat of the baking flue gas of the middle package of the present invention comprises the following steps: a. Add the protective slag to be baked into the baking box 10 through the feed port 12, and close the feed port 12; b. Start the motor transmission device, and drive the gear 2 7 through the gear 1 4 to drive the protective slag stirring device to stir the protective slag in the baking box 10; c. The tundish baking flue gas is introduced into the baking box 10 through the air inlet metal hose 9, and the protective slag is baked using the residual heat of the flue gas. The baked flue gas is discharged through the air outlet metal hose 13; d. After the mold slag is baked, the motor transmission device is turned off, the tundish baking flue gas input is stopped, the discharge port 14 is opened, the jack 15 is started to tilt the baking box 10, and the mold slag is poured out for continuous casting production; e. After pouring out the protective slag, use the jack 15 to restore the baking box 10 to a horizontal level, and repeat steps a→e to bake the protective slag again.

Claims

1. A device for baking protective slag using the residual heat of the smoke from baking the middle bag, characterized in that: The invention comprises a motor (2), a rotating shaft (8), an air inlet metal hose (9), a baking box (10), blades (11), a material inlet (12), an air outlet metal hose (13), a material outlet (14), a jack (15), a support frame (17) and a support roller (18). The baking box (10) is provided with a material inlet (12) and a material outlet (14), and the baking box (10) is connected to the air inlet metal hose (9) and the air outlet metal hose (13) respectively. The motor (2) is connected to the rotating shaft (8) by a gear transmission mechanism. The rotating shaft (8) is arranged inside the baking box (10), and the rotating shaft (8) is provided with blades (11). The bottom of the baking box (10) is provided with a jack (15), and the baking box (10) is rotatably connected to the support frame (17) through the support roller (18).

2. The device for baking protective slag using the residual heat of the smoke from baking the middle bag according to claim 1 is characterized in that: The material inlet (12) is arranged at the top of the baking box (10), and the material outlet (14) is arranged at the bottom of one side of the baking box (10).

3. The device for baking protective slag using the residual heat of the smoke from baking the middle bag according to claim 1 is characterized in that: The air inlet metal hose (9) and the air outlet metal hose (13) are respectively located on two sides of the baking box (10).

4. The device for baking protective slag using the residual heat of the smoke from baking the middle bag according to claim 1 is characterized in that: The support roller (18) is close to the discharge port (14) of the baking box (10), and the jack (15) is far away from the discharge port (14) of the baking box (10).

5. The device for baking protective slag using the residual heat of the smoke from baking the middle bag according to claim 1 is characterized in that: The blades (11) on the rotating shaft (8) are three blades that are evenly arranged.

6. The device for baking protective slag using the residual heat of the smoke from baking the middle bag according to claim 1 is characterized in that: The gear transmission mechanism comprises a connecting shaft (3), a gear 1 (4) and a gear 2 (7); the gear 2 (7) is fixed to the rotating shaft (8) via a nut 2 (6); the gear 1 (4) is fixed to the connecting shaft (3) via a nut 1 (5); the gear 1 (4) and the gear 2 (7) are meshed with each other; and the connecting shaft (3) is connected to the output shaft of the motor (2).

7. A method for baking protective slag using the residual heat of the smoke from baking the tundish, characterized in that: A device for baking protective slag using the residual heat of the flue gas from baking the middle bag as defined in claims 1 to 6 is used and operated according to the following steps: a. adding the protective slag to be baked into the baking box (10) through the feed inlet (12); b. starting the motor (2) to drive the rotating shaft (8) and the blades (11) through the gear transmission mechanism to stir the protective slag in the baking box (10); c. introducing tundish baking flue gas into the baking box (10) through the air inlet metal hose (9), using the residual heat of the flue gas to bake the protective slag, and the baked flue gas is discharged through the air outlet metal hose (13); d. After the protection slag is baked, the motor (2) is turned off, and the jack (15) is started to tilt the baking box (10) and pour out the protection slag from the discharge port (14).

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