Baking and preheating device for continuous casting tundish nozzle

Abstract

The utility model discloses a continuous casting tundish water gap baking preheating device which comprises a tundish and a suction device, the suction device is installed on a water gap and communicated with the water gap, the suction device is provided with an air inlet and an air outlet, the air outlet is communicated with a continuous casting flow position hole through an air return pipe, and the air return pipe is communicated with a continuous casting flow position hole. And an air bag is mounted on the air return pipe. According to the baking and preheating device for the nozzle of the continuous casting tundish, the air outlet is communicated with the continuous casting flow position hole of the tundish through the air return pipe, on one hand, environmental pollution caused by direct exhaust can be effectively avoided, and meanwhile, the poisoning risk caused by exhaust of toxic suction-related gas can be avoided; and on the other hand, gas supporting combustion in the inspiration body, such as carbon monoxide and the like, can be reused, so that the combustion is more sufficient and complete, the energy utilization rate is improved, the energy is saved, the combustion efficiency can be greatly improved, and the baking time of the tundish can be shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous casting tundish baking equipment, in particular to a continuous casting tundish nozzle baking preheating device. Background Art

[0002] The tundish is a container for molten steel between the ladle and the crystallizer in the steelmaking continuous casting production. It is mainly used to receive the molten steel poured from the ladle, and then transfer and distribute the molten steel to each crystallizer. In order to ensure the quality and stability of the molten steel, the tundish needs to be baked and preheated before use. The tundish includes the tundish body and the nozzle at the bottom of the tundish body. During baking, the flame is mainly concentrated in the tundish body. In order to bake and preheat the nozzle at the bottom of the tundish body, a back suction device is often used in production.

[0003] The structure of the back-suction device is disclosed in the patent document of Chinese patent application No. 201020287629.6, which includes a back-suction air duct, which is installed on the water outlet of the tundish, and has an air inlet and an air outlet. When working, air is taken in through the air inlet and discharged through the air outlet. The air inlet is a high-speed airflow. After the high-speed airflow is back-suctioned into the air duct through the air inlet, the instantaneous expansion forms a negative pressure in the back-suction air duct. Under the action of the negative pressure, the flame in the tundish body is sucked into the water outlet, so as to realize the baking preheating of the water outlet of the tundish.

[0004] When the flame in the tundish body is sucked into the nozzle, the gas in the tundish body is also sucked into the nozzle and the back-inhalation device in sequence. Therefore, during the use of the back-inhalation device, the back-inhalation gas discharged from its gas outlet contains not only the gas from the gas inlet, but also the gas from the tundish body. Due to baking and combustion, the gas in the tundish body is mostly carbon monoxide, carbon dioxide, etc. Therefore, the back-inhalation gas discharged from the gas outlet of the back-inhalation device also contains a large amount of carbon monoxide, carbon dioxide, etc.

[0005] The existing back-inhalation device has a spread gas outlet, and the back-inhaled gas including carbon monoxide and carbon dioxide is directly discharged from the gas outlet. The discharge of the back-inhaled gas not only pollutes the environment, but also easily leads to incomplete combustion and frequent triggering of gas alarms, which wastes energy, has low energy utilization, and prolongs the baking time of the tundish. Utility Model Content

[0006] The utility model aims to provide a baking preheating device for a continuous casting tundish nozzle.

[0007] The technical solution to achieve the purpose of the utility model is: a continuous casting tundish water nozzle baking preheating device, including a tundish and a suction device, the tundish includes a tundish body and a top cover, the bottom of the tundish body is provided with a water nozzle, the top cover is covered on the top of the tundish body, the top cover is provided with a continuous casting flow hole, the suction device is installed on the water nozzle and connected with the water nozzle, the suction device is provided with an air inlet and an air outlet, the air outlet is connected with the continuous casting flow hole through a return air pipe, and an air bag is installed on the return air pipe.

[0008] Furthermore, a water outlet is provided at the bottom of the air bag, and a valve is installed on the water outlet. During use, the valve is opened and the water in the air bag can be discharged through the water outlet.

[0009] Furthermore, the air bag is close to the air outlet.

[0010] The utility model provides a baking preheating device for the water nozzle of a continuous casting tundish, wherein the gas outlet is connected to the continuous casting flow position hole of the tundish through the gas return pipe, so that the gas discharged from the gas outlet in the suction device can be sent back to the tundish again through the gas return pipe. A part of the gas discharged from the gas outlet in the suction device comes from the tundish, and contains a large amount of gas generated by combustion, such as carbon monoxide, carbon dioxide, etc., wherein carbon monoxide is usually generated due to incomplete combustion and is a combustible toxic gas. After the gas containing a large amount of carbon monoxide, carbon dioxide, etc. is sent back to the tundish through the gas return pipe, on the one hand, direct discharge can effectively avoid environmental pollution, and at the same time, the risk of poisoning caused by the discharge of toxic gas can be avoided; on the other hand, the gas supporting combustion in the gas, such as carbon monoxide, etc., can be reused, so that the combustion is more complete and sufficient, and the energy utilization rate is improved. While saving energy, the combustion efficiency can also be greatly improved, and the baking time of the tundish can be shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a continuous casting tundish nozzle baking preheating device of the utility model. DETAILED DESCRIPTION

[0012] The following is a detailed description of the preferred embodiment of the continuous casting tundish nozzle baking preheating device of the utility model in conjunction with the accompanying drawings:

[0013] like Figure 1As shown, a continuous casting tundish water nozzle baking preheating device includes a tundish 1 and a suction device 2, the tundish 1 includes a tundish body 11 and a top cover 12, the tundish body 11 has a water nozzle 111 at the bottom, the top cover 12 covers the top of the tundish body 11, the top cover 12 has a continuous casting flow hole 121, the suction device 2 is installed on the water nozzle 111 and communicated with the water nozzle 111, the suction device 2 is provided with an air inlet 21 and an air outlet 22, the air outlet 22 is communicated with the continuous casting flow hole 121 through a return air pipe 3, and an air bag 4 is installed on the return air pipe 3.

[0014] The utility model provides a baking preheating device for a continuous casting tundish nozzle, wherein the tundish 1 comprises a tundish body 11 and a top cover 12 covering the tundish body 11, wherein the tundish body 11 and the top cover 12 form a chamber of the tundish 1, and the nozzle 111 and the continuous casting flow hole 121 are part of the tundish and are both connected to the chamber of the tundish 1. The suction device 2 is installed on the nozzle 111, and after the air inlet 21 is ventilated, it is used to introduce the baking flame in the tundish 1 into the nozzle 111. The return air pipe 3 is used to return the outlet air of the air outlet 22 in the suction device 2 to the tundish 1. The air bag 4 is used to collect water in the return air pipe 3.

[0015] The baking preheating device for the water nozzle of the continuous casting tundish of the present invention is used in the baking preheating work of the tundish 1. When the tundish 1 is baked and preheated, the flame is mainly concentrated in the tundish body 11. In order to bake and preheat the water nozzle 111, high-speed gas is introduced into the suction device 2 from the air inlet 21 in a timely manner. After the introduced high-speed gas enters the suction device 2, it expands instantly to form a negative pressure. The negative pressure attracts the flame in the tundish body 11 into the water nozzle 111, thereby achieving baking and preheating of the water nozzle 111. The suction gas including carbon monoxide, carbon dioxide, etc. in the suction device 2 is discharged from the gas outlet 22, and after passing through the return pipe 3, it is sent back to the tundish 1 through the continuous casting flow hole 121.

[0016] The utility model of the continuous casting tundish water nozzle baking preheating device connects the gas outlet 22 with the continuous casting flow position hole 121 of the tundish 1 through the gas return pipe 3, so that the suction gas discharged from the gas outlet 22 in the suction device 2 can be sent back to the tundish 1 again through the gas return pipe 3. A part of the suction gas discharged from the gas outlet 22 in the suction device 2 comes from the tundish 1, and contains a large amount of gas generated by combustion, such as carbon monoxide, carbon dioxide, etc., wherein carbon monoxide is usually generated due to incomplete combustion and is a combustible toxic gas. After the suction gas containing a large amount of carbon monoxide, carbon dioxide, etc. is sent back to the tundish 1 through the gas return pipe 3, on the one hand, it can effectively avoid direct discharge to pollute the environment, and at the same time, it can also avoid the risk of poisoning caused by the discharge of toxic suction gas; on the other hand, the gas supporting combustion in the suction gas, such as carbon monoxide, etc., can be reused, so that it burns more fully and completely, improves energy utilization, saves energy, and can also greatly improve combustion efficiency and shorten the baking time of the tundish.

[0017] In addition, the continuous casting tundish water inlet baking preheating device of the present invention also arranges the air bag 4 on the return air pipe 3 so that the accumulated water caused by the temperature difference can be collected in the air bag 4, thereby preventing the accumulated water from flowing back and affecting the operation of the suction device 2.

[0018] In the present invention, the continuous casting tundish water inlet baking preheating device is preferably provided with a water outlet 41 at the bottom of the air bag 4, and a valve 42 is installed on the water outlet 41. During use, the valve 42 is opened, and the water in the air bag 4 can be discharged through the water outlet 41.

[0019] In the present utility model continuous casting tundish water nozzle baking preheating device, preferably, the air bag 4 is close to the air outlet 22. This arrangement can be more conducive to the collection of accumulated water.

[0020] For ordinary technicians in the technical field to which the utility model belongs, the utility model can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as falling within the protection scope of the utility model.

Claims

1. A continuous casting tundish nozzle baking preheating device, comprising a tundish and a suction device, wherein the tundish comprises a tundish body and a top cover, wherein the bottom of the tundish body has a nozzle, the top cover is covered on the top of the tundish body, and the top cover has a continuous casting flow position hole, characterized in that: The suction device is installed on the water inlet and communicated with the water inlet. The suction device is provided with an air inlet and an air outlet. The air outlet is communicated with the continuous casting flow hole through an air return pipe. An air bag is installed on the air return pipe.

2. The continuous casting tundish nozzle baking preheating device according to claim 1 is characterized in that: A water outlet is provided at the bottom of the air bag, and a valve is installed on the water outlet.

3. The continuous casting tundish nozzle baking preheating device according to claim 1, characterized in that: The air bag is close to the air outlet.

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