Steel ladle baking flue gas heat recycling device

Abstract

The utility model discloses a steel ladle baking flue gas heat recycling device which comprises a heat exchanger and a waste gas recycling pipeline connecting the heat exchanger and a ladle cover. The heat exchanger comprises a shell, a waste gas inlet communicated with the waste gas recovery pipeline is formed in the lower portion of the shell, and a waste gas outlet is formed in the upper end of the shell. A U-shaped tube bundle is arranged in the shell, a fuel gas inlet and a fuel gas outlet are formed in the two ends of the U-shaped tube bundle respectively, and the fuel gas outlet is connected with a fuel gas tube of the ladle baking gun through a pipeline. The waste gas recovery pipeline is formed by connecting a plurality of pipeline units, and each pipeline unit comprises a recovery pipe connected with the ladle cover and a connecting pipe communicating the pipeline units. According to the device, heat of waste gas generated by ladle baking can be recycled, the heat of the waste gas is used for heating fuel gas, the combustion effect of the fuel gas is improved, and meanwhile the consumption of oxygen is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steelmaking, in particular to a device for recycling heat from ladle baking flue gas. Background Art

[0002] A ladle baker is a device used to bake a newly built ladle before it is filled with molten steel. During the baking process, a large amount of hot flue gas is generated. Directly discharging this flue gas would waste a significant amount of energy and fail to meet current energy conservation and emission reduction requirements. Furthermore, when using gas to bake the ladle, if unheated gas is passed through the baking gun, on the one hand, the gas will not burn fully, reducing the combustion effect. On the other hand, when the unheated gas passes through the gas pipe and mixes with the heated oxygen, it will lower the temperature of the heated oxygen, increasing oxygen consumption proportionally. Therefore, considering the above two aspects, it is of great significance to design a device that can exchange the heat of the flue gas with the gas. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a device for recycling heat of ladle baking fume.

[0004] The utility model is realized by adopting the following technical solutions.

[0005] A device for recovering heat from flue gas during ladle baking, comprising a heat exchanger and an exhaust gas recovery pipeline connecting the heat exchanger and the ladle cover; the heat exchanger comprises a shell, the lower portion of the shell forming an exhaust gas inlet connected to the exhaust gas recovery pipeline, and the upper end of the shell forming an exhaust gas outlet; a U-shaped tube bundle is provided within the shell, the two ends of the U-shaped tube bundle respectively forming a gas inlet and a gas outlet, the gas outlet being connected to the gas pipe of the ladle baking gun through a pipeline; the exhaust gas recovery pipeline is formed by connecting a plurality of pipeline units, each pipeline unit comprising a recovery pipe connected to the ladle cover, and a connecting pipe connecting the pipeline units.

[0006] Furthermore, a plurality of rows of baffles are provided in the shell.

[0007] Furthermore, a plurality of U-shaped tube bundles are provided in the shell, and the plurality of U-shaped tube bundles are connected end to end to form a serpentine shape, with the two ends of the serpentine tube forming a gas inlet and a gas outlet respectively.

[0008] Furthermore, the connecting pipe is arranged obliquely, with one end connected to the upper part of the recovery pipe of the same pipeline unit, and the other end connected to the lower part of the recovery pipe of the adjacent pipeline unit or the exhaust gas inlet.

[0009] This application has the following beneficial effects.

[0010] This device recycles the heat from the exhaust gas generated during baking, using it to heat the fuel gas, improving combustion efficiency. It also raises the temperature of the mixture of fuel gas and oxygen, significantly reducing oxygen consumption. This device offers flexible installation and is suitable for a variety of baking bag covers. It is factory-produced, boasts high precision, and can be assembled on-site. It is less affected by seasonal factors and has a short construction period, meeting energy conservation and emission reduction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the heat exchanger of the present utility model.

[0013] Among them, 1. Shell; 2. U-shaped tube bundle; 3. Baffle; 4. Connecting flange; 5. Exhaust gas outlet; 6. Gas inlet; 7. Gas outlet; 8. Heat exchanger; 9. Exhaust gas recovery pipeline; 91. Recovery pipe; 92. Connecting pipe; 10. Bag cover; 11. Bag baking gun. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 、 2 As shown, a ladle baking flue gas heat recovery device includes a heat exchanger 8 and a waste gas recovery pipeline 9.

[0016] The heat exchanger 8 is arranged on the cover 10, and specifically includes a shell 1. The upper end opening of the shell 1 forms an exhaust gas outlet 5, and the lower side wall opening of the shell 1 forms an exhaust gas inlet. The exhaust gas inlet is provided with a connecting flange 4.

[0017] The housing 1 houses a U-shaped tube bundle 2. Specifically, the U-shaped tube bundle 2 comprises a plurality of tubes, each connected to form a serpentine shape. The ends of the serpentine form a gas inlet 6 and a gas outlet 7, respectively. The gas outlet 7 is connected to the gas pipe of the bag baking gun 11 via a pipeline. Gas enters the U-shaped tube bundle 2 from the gas inlet 6 and ultimately enters the gas pipe of the bag baking gun 11 through the gas outlet 7.

[0018] Several rows of baffles 3 are also provided within the shell 1. These baffles 3 are positioned between the walls of the U-shaped tube bundle 2 and are perpendicular to the axis of the shell 1. Exhaust gas enters the shell 1 through the exhaust gas inlet, passes through the baffles 3 from the bottom of the shell 1, and is ultimately discharged from the top of the shell 1.

[0019] In the process of exhaust gas and fuel gas passing through the heat exchanger 8, the exhaust gas serves as the heating material and the fuel gas serves as the heated material. The exhaust gas enters the heating shell and passes through the baffle 3, fully filling the entire shell 1. At the same time, the fuel gas enters and is fully heated by heat exchange with the exhaust gas in the gas heating U-shaped tube bundle. After heating, the exhaust gas is discharged into the air. The heated fuel gas is introduced into the gas pipe of the baking gun 11 through the connecting pipe.

[0020] The exhaust gas recovery pipeline 9 is composed of several connected pipeline units, each of which includes a recovery pipe 91 and a connecting pipe 92. The recovery pipe 91 is connected to the cover 10 and is used to collect flue gas. The connecting pipe 92 is arranged at an angle, with one end connected to the upper portion of the recovery pipe 91 of the same pipeline unit and the other end connected to the lower portion of the recovery pipe 91 of the adjacent pipeline unit. After several pipeline units are connected in sequence, the connecting pipe 92 of the last pipeline unit is connected to the connecting flange 4 of the exhaust gas inlet, thereby directing the collected flue gas into the heat exchanger 8.

[0021] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A ladle baking fume heat recovery device, characterized by: The invention comprises a heat exchanger (8) and an exhaust gas recovery pipeline (9) connecting the heat exchanger (8) and the cladding cover (10); the heat exchanger comprises a shell (1), the lower part of the shell (1) forms an exhaust gas inlet connected to the exhaust gas recovery pipeline (9), and the upper end of the shell (1) forms an exhaust gas outlet (5); a U-shaped tube bundle (2) is provided in the shell (1), and the two ends of the U-shaped tube bundle (2) respectively form a gas inlet (6) and a gas outlet (7), and the gas outlet (7) is connected to the gas pipe of the baking gun (11) through a pipeline; the exhaust gas recovery pipeline (9) is formed by connecting a plurality of pipeline units, and each pipeline unit includes a recovery pipe (91) connected to the cladding cover (10), and a connecting pipe (92) connecting the pipeline units.

2. The ladle baking fume heat recovery device according to claim 1, characterized in that: A plurality of rows of baffles (3) are provided in the shell (1).

3. The ladle baking fume heat recovery device according to claim 1, characterized in that: A plurality of U-shaped tube bundles (2) are arranged in the shell (1), and the plurality of U-shaped tube bundles (2) are connected end to end to form a serpentine shape, with the two ends of the serpentine tube forming a gas inlet (6) and a gas outlet (7) respectively.

4. The ladle baking fume heat recovery device according to claim 1, characterized in that: The connecting pipe (92) is arranged obliquely, with one end connected to the upper part of the recovery pipe (91) of the same pipeline unit, and the other end connected to the lower part of the recovery pipe (91) of the adjacent pipeline unit or the exhaust gas inlet.

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