Aluminum electrolysis cell side heat dissipating capacity regulation and control equipment

Abstract

The utility model discloses equipment for regulating and controlling lateral heat dissipating capacity of an aluminum electrolysis cell, which comprises a heat exchange chamber with an opening on one side, an air inlet pipe and an air outlet pipe which are communicated with the inside of a cavity of the heat exchange chamber are arranged on the heat exchange chamber, a flow control butterfly valve is further arranged on the air inlet pipe or the air outlet pipe, and the heat exchange chamber consists of an inner shell and an outer shell. And a thermal insulation material is filled between the inner-layer shell and the outer-layer shell. The device is installed on the side wall of the cell shell, under the condition that the temperature of the side portion of the electrolytic cell is too high, external cold air enters the device through the air inlet pipe, redundant heat of the side portion is taken away, and the temperature of the side portion of the electrolytic cell is reduced; under the conditions that the side temperature of the electrolytic cell is too low and the side furnace wall is thick, external hot air enters the device through the air inlet pipe to heat the side of the electrolytic cell, the temperature of the side of the electrolytic cell is increased, and the side furnace wall of the electrolytic cell is properly thinned. The device can be used for adjusting the lateral heat dissipating capacity of the aluminum electrolysis cell, properly adjusting the lateral temperature of the electrolysis cell according to the actual operation condition of the electrolysis cell, and improving the energy balance efficiency of the electrolysis cell.

Description

Technical Field

[0001] The utility model relates to a side heat dissipation control device for an aluminum electrolysis cell, belonging to the technical field of aluminum electrolysis equipment. Background Art

[0002] The electrolytic cell is an aluminum production equipment that reduces aluminum oxide to metallic aluminum through the electrolysis process. In this process, a large amount of electrical energy is converted into thermal energy. During the normal production process of aluminum electrolysis, the side wall heat dissipation surface temperature can reach 200-400°C, and the heat dissipation through the side wall of the aluminum electrolytic cell reaches 20-43% of the heat input. The heat dissipation distribution on the side of the electrolytic cell affects the shape of the furnace of the electrolytic cell. Through reasonable heat dissipation distribution, a good thermal balance of the electrolytic cell can be maintained and a reasonable furnace shape can be maintained. A good furnace shape is an important guarantee for the efficient and stable production of electrolytic aluminum. Therefore, heat dissipation on the side of the electrolytic cell is crucial in the production of aluminum electrolytic cells.

[0003] At present, there are two main aspects of the research on the heat dissipation control of the side wall of the electrolytic cell: on the one hand, it mainly focuses on the design of the electrolytic cell lining. Once the electrolytic cell lining design plan is determined and the electrolytic cell furnace construction is completed, the side heat dissipation distribution of the electrolysis depends on the production management process control. During the long-term operation of the electrolytic cell, it will encounter uncontrollable factors such as current changes and lining material differences. Some electrolytic cells are difficult to take into account both production indicators and safety performance. On the other hand, some electrolytic cells are equipped with a compressed air pipe system on the side, and compressed air is used to blow and cool the side areas with excessively high temperatures. This method is limited to only reducing the temperature of the side of the electrolytic cell. Utility Model Content

[0004] The purpose of the utility model is to provide a device for controlling the heat dissipation of the side of an aluminum electrolytic cell. The device can control the heat dissipation distribution of the side of the electrolytic cell in production in real time according to the actual production status of the electrolytic cell. When the temperature of the side is too high, the temperature can be reduced. When the temperature of the side is too low, the temperature can be increased, so that the entire electrolytic cell forms an ideal furnace shape and improves the production index of the aluminum electrolytic cell.

[0005] The technical solution of the utility model: a side heat dissipation control equipment of an aluminum electrolytic cell, including a heat exchange chamber with an opening on one side, the heat exchange chamber is provided with an air inlet pipe and an air outlet pipe connected with the interior of the chamber, and a flow control butterfly valve is also provided on the air inlet pipe or the air outlet pipe, the heat exchange chamber is composed of an inner and outer shell body, and the space between the inner and outer shell bodies is filled with a thermal insulation material; the inner shell body is a proportionally reduced structure of the outer shell body, and the surfaces of the two facing the open end of the heat exchange chamber are in a flush state; the air inlet pipe extending into the heat exchange chamber is provided with a plurality of small holes.

[0006] In the aforementioned aluminum electrolytic cell side heat dissipation control equipment, the air inlet pipe and the air outlet pipe both extend from the back plate of the heat exchange chamber into the interior thereof.

[0007] In the aforementioned aluminum electrolytic cell side heat dissipation control equipment, the air inlet pipe and the air outlet pipe are respectively arranged at the upper and lower ends of the heat exchange chamber.

[0008] In the aforementioned aluminum electrolytic cell side heat dissipation control equipment, the inner and outer shells are fixedly connected together in the upper, lower, left and right directions via a plurality of connecting blocks.

[0009] In the aforementioned aluminum electrolytic cell side heat dissipation control equipment, the flow control butterfly valve is arranged on the air inlet pipe.

[0010] In the aforementioned aluminum electrolytic cell side heat dissipation control equipment, the inner and outer shells of the heat exchange chamber are both made of steel structure.

[0011] In the aforementioned aluminum electrolytic cell side heat dissipation control equipment, there is one air inlet pipe and two air outlet pipes, and the diameter of the air inlet pipe is larger than the diameter of the air outlet pipe.

[0012] In the aforementioned aluminum electrolytic cell side heat dissipation control equipment, a plurality of aluminum electrolytic cell side heat dissipation control equipment are installed on the side wall between the two cradle frames of the electrolytic cell, below the cell edge plate and above the cathode steel bar of the electrolytic cell, and the air inlet pipes of the plurality of aluminum electrolytic cell side heat dissipation control equipment are connected to the main air inlet pipe, and the air outlet pipes are connected to the main air outlet pipe.

[0013] The beneficial effects of the utility model are as follows: compared with the prior art, by installing the device on the side wall of the tank shell, when the temperature of the side of the electrolytic cell is too high, external cold air enters the device through the air inlet pipe, takes away the excess heat of the side, and reduces the temperature of the side of the electrolytic cell; when the temperature of the side of the electrolytic cell is too low and the side furnace wall is thick, external hot air enters the device through the air inlet pipe, heats the side of the electrolytic cell, increases the temperature of the side of the electrolytic cell, and appropriately thins the side furnace wall of the electrolytic cell. The utility model can be used to adjust the heat dissipation of the side of the aluminum electrolytic cell, and appropriately adjust the temperature of the side of the electrolytic cell according to the actual operation of the electrolytic cell, so as to improve the energy balance efficiency of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 2 It is a front structural schematic diagram of the utility model;

[0016] Figure 3 It is a cross-sectional structural schematic diagram of the utility model;

[0017] Figure 4 It is a structural schematic diagram when the inner and outer shells are connected via a connecting block;

[0018] Figure 5 This is a schematic diagram of the installation structure of the utility model;

[0019] Figure 6 for Figure 5 A partial enlarged schematic diagram of .

[0020] Figure numerals: 1-heat exchange chamber, 2-inlet pipe, 3-outlet pipe, 4-flow control butterfly valve, 5-insulation material, 6-connecting block, 7-small hole. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0022] Embodiment of the utility model: a device for controlling the heat dissipation at the side of an aluminum electrolytic cell, such as Figure 1-6 As shown, the heat exchange chamber 1 includes a rectangular structure with an opening on one side, and the heat exchange chamber 1 is provided with an air inlet pipe 2 and an air outlet pipe 3 connected with the interior of the chamber. A flow control butterfly valve 4 is also provided on the air inlet pipe 2 or the air outlet pipe 3. The heat exchange chamber 1 is composed of an inner and outer shell. The heat exchange chamber 1 is a U-shaped shell composed of the inner and outer shell structure planes. The inner and outer shells are filled with a thermal insulation material 5, and the thermal insulation material 5 can be made of thermal insulation materials such as ceramic fiber cotton.

[0023] During use, several heat dissipation control devices of the utility model are installed on the side wall between two cradles of the electrolytic cell, below the cell edge plate and above the cathode steel bar of the electrolytic cell, and fixed on the side wall of the electrolytic cell by welding.

[0024] When the temperature of the side of the electrolytic cell is too high, the external cold air enters the heat exchange chamber 1 through the air inlet pipe 2, and takes away the excess heat of the side of the electrolytic cell through the air outlet pipe 3, thereby reducing the temperature of the side of the electrolytic cell; when the temperature of the side of the electrolytic cell is too low and the side furnace wall is thick, the external hot air enters the heat exchange chamber 1 through the air inlet pipe 2, heats the side of the electrolytic cell, increases the temperature of the side of the electrolytic cell, and appropriately thins the side furnace wall of the electrolytic cell. The utility model can be used to adjust the heat dissipation of the side of the aluminum electrolytic cell, and appropriately adjust the side temperature of the electrolytic cell according to the actual operation of the electrolytic cell to improve the energy balance efficiency of the electrolytic cell. A heat-insulating material 5 is provided, and when the electrolytic cell needs to be heated, the heat of the hot air can be prevented from being transferred through the heat exchange chamber 1, thereby realizing rapid heating of the side wall of the electrolytic cell. A flow control butterfly valve 4 is provided to control the size of the intake and exhaust volume, thereby controlling the heating and cooling rates.

[0025] The inner shell is a structure of a proportionally reduced outer shell, and the surfaces of the two facing the open end of the heat exchange chamber 1 are flush. This structure allows a certain gap between the inner shell and the outer shell of the heat exchange chamber 1 in terms of length, width and thickness, so that the gap can be filled with thermal insulation material 5 in all directions to achieve a thermal insulation effect.

[0026] The air inlet pipe 2 extends into the heat exchange chamber 1 for a certain distance, and a plurality of small holes 7 are formed in the inner pipe body thereof, which is beneficial for the uniform distribution of the air flow in the heat exchange chamber.

[0027] The air inlet pipe 2 and the air outlet pipe 3 are both extended from the back plate of the heat exchange chamber 1 into the interior thereof, and the air inlet pipe 2 and the air outlet pipe 3 are arranged at the back, so that the air inlet pipe 2 and the air outlet pipe 3 will not touch the adjacent devices during the installation of the device. Several devices of the utility model can be installed in a limited space, thereby improving the heating or cooling efficiency.

[0028] The air inlet pipe 2 and the air outlet pipe 3 are respectively arranged at the upper and lower ends of the heat exchange chamber 1 to ensure that the hot air or cold air is discharged after flowing through a certain distance in the heat exchange chamber 1, thereby achieving heating or cooling of the side wall of the electrolytic cell.

[0029] The inner and outer shells are fixedly connected together in the upper and lower, left and right directions by multiple connecting blocks 6. First, the inner and outer shells are welded and fixed together by the connecting blocks 6, and then the insulation material 5 is filled into the internal gap. The connecting blocks 6 can ensure that the gaps in the upper and lower directions and the left and right directions are the same.

[0030] The flow control butterfly valve 4 is arranged on the air inlet pipe 2, and the heating and cooling rates of the side wall of the electrolytic cell can be controlled by controlling the air intake amount.

[0031] The inner and outer shells of the heat exchange chamber 1 are both made of steel, which is convenient to obtain and manufacture, and is also convenient to weld and fix on the side wall of the electrolytic cell.

[0032] There is one inlet pipe 2 and two outlet pipes 3, and the diameter of the inlet pipe 2 is larger than that of the outlet pipe 3. This allows a larger air intake, and the small diameter of the outlet pipe 3 allows the gas to stay longer in the heat exchange chamber 1, so that there is enough time for heat exchange.

[0033] A number of heat dissipation control devices for the side of the aluminum electrolysis cell are installed at the side wall position between the two cradle frames of the electrolysis cell, below the cell ledge plate and above the cathode steel bars of the electrolysis cell. The intake pipes 2 of the number of heat dissipation control devices for the side of the aluminum electrolysis cell are connected to the main intake pipe, and the exhaust pipes 3 are connected to the main exhaust pipe. The main intake pipe is used for unified air supply, and the main exhaust pipe is used for unified discharge. When the heat dissipation control device is installed between the two cradle frames of the electrolysis cell, holes are drilled in the cradle frames, and the cradle frames and the heat dissipation control device are fixed together with bolts to improve the stability of the device.

[0034] Taking a 500 kA electrolysis cell as an example, the structural external dimensions of the present utility model are determined according to the space dimensions between the two groups of cradle frames and the space dimensions between the lower edge of the cell ledge plate and the upper edge of the steel bars to manufacture the heat exchange chamber 1. The heat exchange chamber 1 is in a shape of a double-square frame, as Figure 1 shown. Heat-insulating materials such as ceramic fiber cotton 5 are filled in the gap between the inner and outer side shells of the heat exchange chamber 1. An intake pipe 2 and an exhaust pipe 3 are arranged on the inner back plate of the heat exchange chamber. In this embodiment, there is 1 intake pipe with a relatively larger diameter compared to the exhaust pipes; there are 2 exhaust pipes with relatively smaller diameters compared to the intake pipe. The dimensions and quantities of the exhaust pipe 3 and the intake pipe 2 can be adjusted according to the actual temperature on the side of the electrolysis cell and the production process. Holes are drilled in the part of the intake pipe 2 extending into the heat exchange chamber 1, and a flow control butterfly valve 4 is arranged outside the heat exchange chamber 1. The heat exchanger 1 is installed in the gap between the two groups of cradle frames, below the cell ledge plate and below the cathode steel bars. The intake pipe 2 is connected to the main intake pipe, and the exhaust pipe 3 is connected to the main exhaust pipe, as Figure 5 and Figure 6 shown.

[0035] The present utility model is applicable to all electrolysis cell types of 200 kA and above. This device can be used as long as there is space between the two cradle frames of the electrolysis cell.

Claims

1. A device for controlling the heat dissipation at the side of an aluminum electrolytic cell, characterized in that: The invention comprises a heat exchange chamber (1) with an opening on one side, an air inlet pipe (2) and an air outlet pipe (3) which are connected to the interior of the chamber of the heat exchange chamber (1), and a flow control butterfly valve (4) is also arranged on the air inlet pipe (2) or the air outlet pipe (3). The heat exchange chamber (1) is composed of an inner shell and an outer shell, and the space between the inner shell and the outer shell is filled with a heat-insulating material (5); the inner shell is a proportionally reduced structure of the outer shell, and the surfaces of the two shells facing the open end of the heat exchange chamber (1) are in a flush state; and a plurality of small holes (7) are opened on the body of the air inlet pipe (2) extending into the interior of the heat exchange chamber (1).

2. The device for controlling heat dissipation at the side of an aluminum electrolytic cell according to claim 1, characterized in that: The air inlet pipe (2) and the air outlet pipe (3) both extend from the back plate of the heat exchange chamber (1) into the interior thereof.

3. The side heat dissipation control equipment of an aluminum electrolytic cell according to claim 1, characterized in that: The air inlet pipe (2) and the air outlet pipe (3) are respectively arranged at the upper and lower ends of the heat exchange chamber (1).

4. The device for controlling heat dissipation at the side of an aluminum electrolytic cell according to claim 1, characterized in that: The inner and outer shells are fixedly connected together in the upper and lower, left and right directions via a plurality of connecting blocks (6).

5. The device for controlling heat dissipation at the side of an aluminum electrolytic cell according to claim 1, characterized in that: The flow control butterfly valve (4) is arranged on the air intake pipe (2).

6. The device for controlling heat dissipation at the side of an aluminum electrolytic cell according to claim 1, characterized in that: The inner and outer shells of the heat exchange chamber (1) are both made of steel.

7. The device for controlling heat dissipation at the side of an aluminum electrolytic cell according to claim 1, characterized in that: One air inlet pipe (2) is provided, and two air outlet pipes (3) are provided, and the diameter of the air inlet pipe (2) is greater than the diameter of the air outlet pipe (3).

8. The device for controlling heat dissipation at the side of an aluminum electrolytic cell according to claim 1, characterized in that: A plurality of aluminum electrolytic cell side heat dissipation control devices are installed at the side wall position between the two cradle frames of the electrolytic cell, below the cell edge plate and above the cathode steel bar of the electrolytic cell. The air inlet pipes (2) of the plurality of aluminum electrolytic cell side heat dissipation control devices are connected to the main air inlet pipe, and the air outlet pipes (3) are connected to the main air outlet pipe.

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