Alumina calcination waste heat recovery and utilization device

Abstract

The utility model relates to the technical field of alumina production equipment discloses a kind of alumina calcination waste heat recovery and utilization device, including calcining furnace, further include: heat converter, including heat exchange box, heat conducting agent and heat exchange pipe assembly;After the heat exchange pipe assembly is connected to calcining furnace, pass through heat exchange box, heat exchange box is filled with heat conducting agent;Heat recovery mechanism, including annular water tank, circulating water pipe, water tank and circulating water pump;The annular water tank is wrapped and fixed on the outer wall of heat exchange box, and is connected between water tank by two circulating water tanks, and circulating water pump is installed and fixed on water tank, and drive annular water tank, circulating water pipe and water tank between form unidirectional circulation flow water flow, water tank bottom is also provided with the drain port with valve.Compared with prior art, the advantage lies in: the utility model provides a kind of alumina calcination waste heat recovery and utilization device, improves waste heat recovery efficiency by optimizing heat exchange structure and heat recovery mechanism, reduces energy waste.

Description

Technical Field

[0001] This utility model relates to the technical field of alumina production equipment, specifically to a device for recovering and utilizing waste heat from alumina roasting. Background Technology

[0002] Alumina (Al₂O₃) is a high-hardness compound with a melting point of 2045℃ and a boiling point of 2980℃ (℃, 5.2kPa). It is insoluble in water, alcohols, and ethers, and slightly soluble in alkalis and acids. During alumina production, the calcining furnace generates a large amount of high-temperature flue gas, which is typically emitted directly, resulting in wasted heat energy. While some waste heat recovery devices exist in existing technologies, they generally suffer from low heat exchange efficiency and insufficient heat recovery.

[0003] Therefore, there is an urgent need for a highly efficient and structurally sound waste heat recovery and utilization device to solve the above problems. We hereby propose a waste heat recovery and utilization device for alumina roasting. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical difficulties and provide an alumina roasting waste heat recovery and utilization device. By optimizing the heat exchange structure and heat recovery mechanism, the waste heat recovery efficiency is improved and energy waste is reduced.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A device for recovering and utilizing waste heat from alumina roasting includes a roasting furnace, and further includes:

[0007] A heat exchanger includes a heat exchange box, a heat transfer fluid, and a heat exchange tube assembly; the heat exchange tube assembly is connected to a calcining furnace and passes through the heat exchange box, which is filled with a heat transfer fluid.

[0008] The heat recovery mechanism includes an annular water tank, a circulating water pipe, a water tank, and a circulating water pump. The annular water tank is fixed to the outer wall of the heat exchange box and connected to the water tank through two circulating water pipes. The circulating water pump is installed and fixed on the water tank and drives the annular water tank, the circulating water pipe, and the water tank to form a unidirectional circulating water flow. The bottom of the water tank is also provided with a drain outlet with a valve.

[0009] As an improvement, the heat exchange tube assembly includes a transfer gas box, a spiral gas pipe, an inlet pipe, and an outlet pipe. A pair of transfer gas boxes are arranged vertically and are respectively mounted and fixed inside the heat exchange box. The two are connected by the spiral gas pipe. The inlet pipe passes through the heat exchange box and connects to the exhaust port of the calcining furnace between the lower transfer gas box and the exhaust port. The outlet pipe passes through the heat exchange box and connects to the upper transfer gas box. This allows for more efficient heat exchange of the flue gas in the calcining furnace through the heat transfer agent.

[0010] As an improvement, a stirring mechanism is also included; the stirring mechanism includes a motor, a rotating shaft, and stirring blades; the top end of the rotating shaft is rotatably connected to the top wall of the water tank, and the top end is connected to a motor drive fixed to the top of the water tank; multiple stirring blades are evenly fixed on the rotating shaft. This allows the water in the water tank to be heated more evenly.

[0011] It is worth mentioning that the circulating water pump and motor used in this technical solution are existing devices that are common knowledge, and their use and control methods are existing technologies.

[0012] The advantages of this utility model compared with the prior art are as follows:

[0013] 1. When in use, this new type of gas significantly improves heat exchange efficiency through the combination of spiral gas pipe and heat-conducting agent, making full use of the waste heat of flue gas from the roasting furnace.

[0014] 2. In use, the design of the annular water tank and the insulation layer reduces heat loss, and the circulating water pump and stirring mechanism further optimize the heat recovery effect.

[0015] 3. This new structure is simple and reasonable, easy to maintain, and suitable for industrial production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is the utility model Figure 1 A partial structural diagram.

[0018] Figure 3 This is a structural schematic diagram of the water tank part of this utility model.

[0019] Figure 4 This is a schematic diagram of the heat exchange box part of this utility model.

[0020] Figure 5 This is a schematic diagram of the spiral trachea of ​​this utility model.

[0021] As shown in the figure: 1. Roasting furnace; 2. Heat exchange box; 3. Annular water tank; 4. Circulating water pipe; 5. Water tank; 6. Circulating water pump; 7. Drain outlet; 8. Transfer gas box; 9. Spiral gas pipe; 10. Inlet pipe; 11. Outlet pipe; 12. Motor; 13. Rotating shaft; 14. Stirring blade; 15. Insulation layer. Detailed Implementation

[0022] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] A device for recovering and utilizing waste heat from alumina roasting, comprising:

[0025] Calcination furnace 1;

[0026] The heat exchanger includes a heat exchange box 2, a heat transfer agent, and a heat exchange tube assembly. The heat exchange box 2 is filled with a heat transfer agent, which is a liquid with good thermal conductivity, such as a water-based heat transfer fluid. The heat exchange tube assembly includes a transfer gas box 8, a spiral gas pipe 9, an inlet pipe 10, and an outlet pipe 11. A pair of transfer gas boxes 8 are arranged vertically and are respectively mounted and fixed inside the heat exchange box 2. The two are connected by the spiral gas pipe 9. The inlet pipe 10 passes through the heat exchange box 2 and is connected between the lower transfer gas box 8 and the exhaust port of the roasting furnace 1. The outlet pipe 11 passes through the heat exchange box 2 and is connected to the upper transfer gas box 8.

[0027] The heat recovery mechanism includes an annular water tank 3, a circulating water pipe 4, a water tank 5, and a circulating water pump 6. The annular water tank 3 is fixed to the outer wall of the heat exchange box 2 and connected to the water tank 5 via two circulating water pipes 5. The circulating water pump 6 is installed and fixed on the water tank 5, driving a unidirectional circulating water flow between the annular water tank 3, the circulating water pipe 4, and the water tank 5. The bottom of the water tank 5 is also equipped with a drain outlet 7 with a valve. Seven spiral air pipes 9 are evenly arranged horizontally between the two intermediate air tanks 8. The outer wall of the annular water tank 3 is covered with an insulation layer 15, which is a polyurethane foam layer. The bottoms of both the heat exchange box 2 and the water tank 5 are each fixed with five supporting legs.

[0028] The stirring mechanism includes a motor 12, a rotating shaft 13, and stirring blades 14. The top end of the rotating shaft 13 is rotatably connected to the top wall of the water tank 5, and the top end is driven by the motor 12, which is installed and fixed on the top of the water tank 5. Multiple stirring blades 14 are evenly fixed on the rotating shaft 13.

[0029] In the specific implementation of this embodiment:

[0030] like Figure 1 and 2 As shown, the flue gas produced by the roasting furnace 1 enters the heat exchange box 2 through the inlet pipe 10. The design of the transfer gas box 8 and the spiral gas pipe 9 enables efficient heat exchange of the flue gas into the water in the annular water tank 3. The flue gas is finally discharged through the outlet pipe 11. At the same time, the circulating water pump 6 drives the water to circulate unidirectionally between the annular water tank 3, the circulating water pipe 4, and the water tank 5, ultimately heating the water in the water tank 5. The stirring mechanism ensures that the water in the water tank 3 is heated more efficiently and evenly.

[0031] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A device for recovering and utilizing waste heat from alumina roasting, comprising a roasting furnace (1), characterized in that, Also includes: A heat exchanger, comprising a heat exchange box (2), a heat transfer fluid, and a heat exchange tube assembly; After the heat exchange tube assembly is connected to the calcining furnace (1), it passes through the heat exchange box (2), which is filled with heat-conducting agent. The heat recovery mechanism includes an annular water tank (3), a circulating water pipe (4), a water tank (5), and a circulating water pump (6). The annular water tank (3) is wrapped and fixed on the outer wall of the heat exchange box (2) and connected to the water tank (5) through two circulating water tanks (5). The circulating water pump (6) is installed and fixed on the water tank (5) and drives the annular water tank (3), the circulating water pipe (4), and the water tank (5) to form a unidirectional circulating water flow. The bottom of the water tank (5) is also provided with a drain outlet (7) with a valve.

2. The alumina roasting waste heat recovery and utilization device according to claim 1, characterized in that: The heat exchange tube assembly includes a transfer gas box (8), a spiral gas pipe (9), an inlet pipe (10), and an outlet pipe (11). A pair of transfer gas boxes (8) are arranged at the top and bottom, and are respectively mounted and fixed inside the heat exchange box (2). The two are connected by the spiral gas pipe (9). The inlet pipe (10) passes through the heat exchange box (2) and is connected between the lower transfer gas box (8) and the exhaust port of the roasting furnace (1). The outlet pipe (11) passes through the heat exchange box (2) and is connected to the upper transfer gas box (8).

3. The alumina roasting waste heat recovery and utilization device according to claim 2, characterized in that: Multiple spiral air tubes (9) are evenly arranged along the horizontal plane between the two transfer air boxes (8).

4. The alumina roasting waste heat recovery and utilization device according to claim 1, characterized in that: The outer wall of the annular water tank (3) is covered with a heat insulation layer (15).

5. The alumina roasting waste heat recovery and utilization device according to claim 1, characterized in that: It also includes a stirring mechanism; the stirring mechanism includes a motor (12), a rotating shaft (13) and stirring blades (14); the top end of the rotating shaft (13) is rotatably connected to the top wall of the water tank (5), and the top end is driven by the motor (12) installed and fixed on the top of the water tank (5); multiple stirring blades (14) are evenly fixed on the rotating shaft (13).

6. The alumina roasting waste heat recovery and utilization device according to claim 1, characterized in that: The bottom of both the heat exchange box (2) and the water tank (5) is fixed with multiple support legs.

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