Aluminum electrolysis flue gas waste heat utilization device

Abstract

The aluminum electrolysis flue gas waste heat utilization device comprises a box body, a sliding pipe, an electric push rod and a blocking metal plate, a partition plate is fixedly connected to the inner side of the box body, the interior of the box body on the left side and the right side of the partition plate is divided into a backflow bin and a heat exchange bin, and a feeding port is formed in the top end of the box body; the bottom of the feeding port communicates with the top end of a sliding-off pipe arranged in the heat exchange bin, the lower end of the sliding-off pipe communicates with a discharging port formed in the right side wall of the box body, a plurality of blocking metal plates are fixedly connected to the surface of the inner bottom of the sliding-off pipe in a staggered distribution mode, and the bottoms of the blocking metal plates penetrate through the surface of the bottom of the sliding-off pipe. A supporting block is fixedly connected to the right side wall of the box body above the discharging opening, and an electric push rod is fixedly connected to the bottom of the supporting block; according to the device, flue gas is recycled by arranging the backflow bin, so that heat exchange is carried out to the maximum extent, and the baffle is arranged to stop electrolysis raw materials in the sliding pipe and wait for the electrolysis raw materials to fully absorb heat, so that the heat exchange efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of aluminum electrolysis, and specifically provides a device for utilizing waste heat from aluminum electrolysis flue gas. Background Art

[0002] With the growth of the global economy and the progress of technology, the electrolytic aluminum industry has shown a rapid growth trend. Electrolytic aluminum is an industrial production process that converts alumina into metallic aluminum through electrolysis. It has the advantages of high production efficiency and stable product quality. At the same time, since a large amount of electric energy is consumed during the electrolysis process, aluminum electrolysis is also a high-energy-consuming industrial production process. During the production process, flue gas is generated, and this flue gas contains a large amount of heat. Direct emission will lead to waste of thermal energy.

[0003] Patent No. CN 219640723 U discloses a device for utilizing waste heat from flue gas in an aluminum electrolysis system and an aluminum electrolysis system. High-temperature flue gas is discharged from the fire hole. Under the action of the flue gas collection hood, it enters the annular flue gas channel between the outer pipe and the inner pipe and spontaneously moves from bottom to top. The electrolysis raw materials in the storage mechanism spontaneously enter the inner pipe of the heat exchange mechanism along the feeding port under the action of gravity and are discharged from the lower end of the inner pipe and enter the electrolytic cell through the fire hole to participate in the electrolysis reaction. During the process of the high-temperature flue gas rising in the annular flue gas channel, heat exchange occurs with the raw materials descending in the inner pipe. The heat of the high-temperature flue gas is transferred to the raw materials, increasing the temperature of the raw materials. The raw materials with increased temperature in the electrolytic cell will not only reduce the degree of damage to the thermal balance in the electrolytic cell but also quickly participate in the electrolysis reaction, improving the electrolysis efficiency.

[0004] However, in use, it has the following defects:

[0005] Although the flue gas is allowed to rise from bottom to top to preheat the electrolysis raw materials, the rising speed of the flue gas is relatively fast, and the descending speed of the electrolysis raw materials is also relatively fast. It is possible that the heat has not been transferred in place and they have already passed by each other, resulting in a low heat utilization efficiency and waste of thermal energy. Utility Model Content

[0006] The purpose of this application is to provide a device for utilizing waste heat from aluminum electrolysis flue gas, which solves the problem that in the background art, the rising speed of the flue gas is relatively fast, the descending speed of the electrolysis raw materials is also relatively fast, it is possible that the heat has not been transferred in place and they have already passed by each other, resulting in a low heat utilization efficiency and waste of thermal energy.

[0007] To achieve the above object, the present application provides the following technical solution: An aluminum electrolysis flue gas waste heat utilization device, including a box body, a sliding pipe, an electric push rod and a blocking metal plate. A partition plate is fixedly connected to the inner side of the box body. The interior of the box body on the left and right sides of the partition plate is divided into a reflux chamber and a heat exchange chamber. A feed port is opened at the top of the box body. The bottom of the feed port communicates with the top end of the sliding pipe opened inside the heat exchange chamber. The lower end of the sliding pipe communicates with the discharge port opened on the right side wall of the box body. A plurality of blocking metal plates are fixedly connected to the inner bottom surface of the sliding pipe in a staggered manner. The bottom of the blocking metal plate penetrates the bottom surface of the sliding pipe; A support block is fixedly connected to the right side wall of the box body above the discharge port. An electric push rod is fixedly connected to the bottom of the support block. The bottom of the electric push rod is fixedly connected to the convex block on the outer side wall of the baffle. The baffle fits against the right wall of the box body.

[0008] In this technical solution, the flue gas moves upward along the channel in the heat exchange chamber, transfers heat to the blocking metal plate after contacting the blocking metal plate for heat exchange, enters the reflux chamber after bending, and re-enters the heat exchange chamber after being filtered by the filter screen, and continues to contact the sliding pipe for heat exchange, so as to maximize the utilization of the heat in the flue gas and improve the utilization efficiency. After the electrolysis raw material enters the sliding pipe, it will not slide directly under the blocking action of the blocking metal plate, but slides continuously along the direction of the blocking metal plate, thus increasing the time in the sliding pipe. And after the electric push rod on the right side wall of the box body starts and extends, it will drive the baffle to move downward, thus blocking the discharge port and making the electrolysis raw material stay in the sliding pipe and wait to be fully heated before being discharged, thereby increasing the utilization efficiency of heat.

[0009] As an optional solution of the technical solution of the present application, a motor is fixedly connected to the inner left side at the top of the box body. A fan shaft is rotatably connected to the inner top of the box body directly below the motor. The tail end of the transmission shaft of the motor is fixedly connected to the top end of the fan shaft.

[0010] As an optional solution of the technical solution of the present application, the inner bottom wall of the reflux chamber and the inner wall at the connection of the reflux chamber and the heat exchange chamber are both detachably connected with filter screens.

[0011] As an optional solution of the technical solution of the present application, an air inlet is opened on the right side of the inner bottom of the heat exchange chamber, and an exhaust port is opened at the bottom of the inner left side wall of the reflux chamber.

[0012] As an optional solution of the technical solution of the present application, a box door is opened at the lower left of the front surface of the box body.

[0013] As an optional solution of the technical solution of the present application, a plurality of ventilation holes are opened on the part of the surface of the blocking metal plate located in the heat exchange chamber.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows:

[0015] 1. In the present application, through the partition plate, the reflux chamber and the blocking metal plate, the flue gas can be recycled. The flue gas moves upward along the channel in the heat exchange chamber, contacts the blocking metal plate and transfers heat to the blocking metal plate for heat exchange. After bending and moving, it enters the reflux chamber, and after being filtered by the filter screen, it re-enters the heat exchange chamber and continues to contact the sliding pipe for heat exchange, thereby maximizing the utilization of the heat in the flue gas and improving the utilization efficiency.

[0016] 2. In the present application, through the blocking metal plate, the electric push rod and the baffle plate, the electrolysis raw materials can be blocked. After the electrolysis raw materials enter the sliding pipe, they continuously slide along the direction of the blocking metal plate, thereby increasing the time in the sliding pipe. And when the electric push rod on the right side wall of the box body starts to extend, it will drive the baffle plate to move downward, thereby blocking the discharge port and making the electrolysis raw materials stay in the sliding pipe and wait to be discharged after fully absorbing heat, thereby increasing the utilization efficiency of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, other features, objects and advantages of the present application will become more apparent:

[0018] Figure 1 It is an overall view of a device for utilizing waste heat of aluminum electrolysis flue gas according to the present application;

[0019] Figure 2 It is a schematic cross-sectional structure view of a device for utilizing waste heat of aluminum electrolysis flue gas according to the present application.

[0020] In the figure: 1, box body; 2, box door; 3, feed inlet; 4, sliding pipe; 5, blocking metal plate; 501, ventilation hole; 6, discharge port; 7, reflux chamber; 701, heat exchange chamber; 8, filter screen; 9, exhaust port; 10, motor; 11, fan shaft; 12, support block; 13, electric push rod; 14, baffle plate; 15, partition plate; 16, air inlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the following will be further described in conjunction with specific embodiments.

[0022] A device for utilizing waste heat of aluminum electrolysis flue gas, see Figures 1 to 2, including a box body 1, a sliding pipe 4, an electric push rod 13 and a blocking metal plate 5. A partition plate 15 is fixedly connected to the inner side of the box body 1. The interior of the box body 1 on the left and right sides of the partition plate 15 is divided into a reflux chamber 7 and a heat exchange chamber 701. A feed inlet 3 is opened at the top of the box body 1. The bottom of the feed inlet 3 is communicated with the top end of the sliding pipe 4 opened inside the heat exchange chamber 701. The lower end of the sliding pipe 4 is communicated with a discharge port 6 opened on the right side wall of the box body 1. And a plurality of blocking metal plates 5 are fixedly connected to the inner bottom surface of the sliding pipe 4 in an alternating distribution manner. The bottom of the blocking metal plate 5 penetrates through the bottom surface of the sliding pipe 4. The flue gas enters the reflux chamber 7, and after being filtered by the filter screen 8, it re-enters the heat exchange chamber 701, continues to contact the sliding pipe 4 and conducts heat exchange, so as to make the best use of the heat in the flue gas; A support block 12 is fixedly connected to the right side wall of the box body 1 above the discharge port 6. An electric push rod 13 is fixedly connected to the bottom of the support block 12. The bottom of the electric push rod 13 is fixedly connected to a convex block on the outer side wall of the baffle 14. The baffle 14 fits against the right wall of the box body 1. The blocking metal plate 5 increases the residence time in the sliding pipe 4. And the electric push rod 13 on the right side wall of the box body 1 drives the baffle 14 to block the discharge port 6, so that the electrolysis raw material stays in the sliding pipe 4 and waits to fully absorb heat, improving the heat utilization efficiency.

[0023] Specifically, as Figure 2 shown, a motor 10 is fixedly connected to the inner left side at the top of the box body 1. A fan shaft 11 is rotatably connected to the inner top of the box body 1 directly below the motor 10. The tail end of the transmission shaft of the motor 10 is fixedly connected to the top end of the fan shaft 11. After the motor 10 is started, it drives the fan shaft 11 to rotate and draw air downward, so as to accelerate the circulation of the flue gas.

[0024] It should be noted that, as Figure 2 shown, filter screens 8 are detachably connected to the lower inner wall of the reflux chamber 7 and the inner wall at the connection between the reflux chamber 7 and the heat exchange chamber 701. The filter screens 8 can filter the flue gas during the circulation of the flue gas, so as to intercept the particulate dust in the flue gas and facilitate subsequent cleaning.

[0025] It should be noted that, as Figure 2 shown, an air inlet 16 is opened on the right side of the inner bottom of the heat exchange chamber 701. An exhaust port 9 is opened at the bottom of the inner left side wall of the reflux chamber 7. The left end of the air inlet 16 is set as an inclined slope, so that the flue gas will rise along the slope, and thus will not directly enter the reflux chamber 7, but needs to turn around and enter the reflux chamber 7 from above. After the exhaust port 9 is opened, the flue gas after heat exchange is discharged and recycled.

[0026] It should be noted that, as Figure 1 shown, a box door 2 is opened at the lower left of the front surface of the box body 1. After the box door 2 is opened, the filter screen 8 can be disassembled, which facilitates cleaning and avoids blockage during the circulation process.

[0027] It should be noted that, as Figure 2 shown, a number of ventilation holes 501 are provided on the part of the surface of the blocking metal plate 5 located in the heat exchange chamber 701. The ventilation holes 501 can increase the contact area between the blocking metal plate 5 and the flue gas, thereby enhancing the heat exchange effect.

[0028] During actual use, the flue gas enters the heat exchange chamber 701 inside the box body 1 along the air inlet 16, and the electrolysis raw material enters the sliding pipe 4 along the feed inlet 3. The flue gas moves upward along the channel in the heat exchange chamber 701, contacts the blocking metal plate 5 and transfers the heat to the blocking metal plate 5 for heat exchange. After moving in a bent manner, it enters the reflux chamber 7, and after being filtered by the filter screen 8, it re-enters the heat exchange chamber 701 to continue contacting the sliding pipe 4 and conduct heat exchange, thereby maximizing the utilization of the heat in the flue gas and improving the utilization efficiency. After the electrolysis raw material enters the sliding pipe 4, under the blocking effect of the blocking metal plate 5, it will not slide directly, but continuously slides along the direction of the blocking metal plate 5, thereby increasing the residence time in the sliding pipe 4. Moreover, after the electric push rod 13 on the right side wall of the box body 1 starts to extend, it will drive the baffle 14 to move downward, thereby blocking the discharge port 6 and making the electrolysis raw material stay in the sliding pipe 4, waiting to fully absorb heat before being discharged, thus increasing the heat utilization efficiency. After the heat of the flue gas is almost absorbed, the valve of the exhaust port 9 is opened to discharge and recycle the flue gas.

[0029] In addition, the components designed in the present utility model are all common standard components or components known to those skilled in the art. Their structures and principles can all be learned by those skilled in the art through technical manuals or through conventional experimental methods. Those skilled in the art can fully implement them without further elaboration. The content protected by the present utility model does not involve improvements to the internal structure and method either.

[0030] The embodiments disclosed in the present utility model are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present utility model based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present utility model, they are within the protection scope of the present utility model.

Claims

1. A device for utilizing waste heat from aluminum electrolysis flue gas, comprising a housing (1), a slide pipe (4), an electric push rod (13) and a blocking metal plate (5), characterized in that: A partition plate (15) is fixedly connected to the inner side of the box body (1), and the interior of the box body (1) on the left and right sides of the partition plate (15) is divided into a reflux chamber (7) and a heat exchange chamber (701). A feed port (3) is provided at the top of the box body (1), and the bottom of the feed port (3) is communicated with the top of a slide pipe (4) provided inside the heat exchange chamber (701), and the lower end of the slide pipe (4) is communicated with a discharge port (6) provided on the right side wall of the box body (1), and the slide pipe ( 4), the inner bottom surface of which is staggeredly and fixedly connected with a plurality of blocking metal plates (5), the bottom of which passes through the bottom surface of the sliding tube (4); a support block (12) is fixedly connected to the right side wall of the box body (1) above the discharge port (6), the bottom of which is fixedly connected with an electric push rod (13), the bottom of which is fixedly connected with a protrusion on the outer side wall of a baffle (14), and the baffle (14) is in contact with the right wall of the box body (1).

2. The aluminum electrolysis fume waste heat utilization device according to claim 1, characterized in that: A motor (10) is fixedly connected to the left side of the top of the box (1), a fan shaft (11) is rotatably connected to the top of the box (1) directly below the motor (10), and the rear end of the transmission shaft of the motor (10) is fixedly connected to the top of the fan shaft (11).

3. The aluminum electrolysis fume waste heat utilization device according to claim 1, characterized in that: The lower inner wall of the reflux bin (7) and the inner wall of the connection point between the reflux bin (7) and the heat exchange bin (701) are both detachably connected with a filter screen (8).

4. The aluminum electrolysis fume waste heat utilization device according to claim 1, characterized in that: An air inlet (16) is provided on the right side of the inner bottom of the heat exchange chamber (701), and an air outlet (9) is provided on the bottom of the inner left side wall of the reflux chamber (7).

5. The aluminum electrolysis fume waste heat utilization device according to claim 1, characterized in that: A box door (2) is provided at the lower left side of the front surface of the box body (1).

6. The aluminum electrolysis fume waste heat utilization device according to claim 1, characterized in that: A portion of the surface of the blocking metal plate (5) located in the heat exchange chamber (701) is provided with a plurality of ventilation holes (501).

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