An auxiliary heating furnace for an electrolytic cell

Abstract

An auxiliary heating furnace for an electrolytic cell, belonging to the technical field of auxiliary equipment in the molten salt electrolysis production process, includes a furnace hood. The furnace hood is arranged around the outer side wall of the electrolytic cell. The furnace hood is composed of several furnace hood units. One side of each furnace hood unit is fixedly connected to a driving rotating shaft. The several furnace hood units are arranged in a circular pattern centered on the electrolytic cell. When the furnace hood units are closed, they surround the outer side wall of the electrolytic cell for one week. Several heating devices are provided on the side of the furnace hood facing the electrolytic cell. There is a heat insulation cotton between the heating devices and the furnace hood. A temperature measuring device is provided on the furnace hood. The driving rotating shaft and the heating devices are connected to a power cabinet. By arranging an openable and closable auxiliary heating furnace around the electrolytic cell and using the electric heating method to heat and melt the cold materials in the electrolytic cell, the dynamic balance of energy in the production process is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of auxiliary equipment in the production process of molten salt electrolysis, and particularly relates to an auxiliary heating furnace for an electrolytic cell. Background Art

[0002] Since the development of the molten salt electrolysis process for metal preparation for nearly 200 years, it has played a crucial role in the extraction of metals such as aluminum, calcium, beryllium, lithium, sodium, thorium, niobium, zirconium, tantalum, and rare earths. In the existing production process, for example, in the lithium and sodium molten salt refining processes, the electrolyte is often melted in advance by a melting furnace before starting the electrolytic cell, and then added to the electrolytic cell to be energized to start the electrolytic cell. For this purpose, it is necessary to separately set up a melting furnace equipment area, and the liquid molten salt needs to be transferred before it can be added to the electrolytic cell. The transfer operation requires a large amount of human and material resources, and there is a certain high-temperature risk. In addition, during the normal production process of the electrolytic cell, operations such as pole changing and feeding are required. During the operation process, the original energy balance of the electrolytic cell is often destroyed due to energy loss and material input. Summary of the Invention

[0003] In view of the above-mentioned disadvantages and deficiencies of the prior art, the present invention provides an auxiliary heating furnace for an electrolytic cell, which adds an auxiliary heating facility to the existing electrolytic cell, changes the existing production operation process, replaces the existing material melting furnace, simplifies the operation steps, and can specifically adjust the energy balance of the electrolytic cell during the production process to maintain the normal progress of production.

[0004] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0005] An auxiliary heating furnace for an electrolytic cell, comprising a furnace hood, the furnace hood is arranged around the outer side wall of the electrolytic cell, the furnace hood is composed of a plurality of furnace hood units, one side of each furnace hood unit is fixedly connected to a driving rotating shaft, and a plurality of furnace hood units are arranged in a circular arrangement with the electrolytic cell as the center. When the furnace hood units are closed, the furnace hood units surround the outer side wall of the electrolytic cell for one week. On the side of the furnace hood facing the electrolytic cell, a plurality of heating devices are provided, a heat insulation cotton is provided between the heating devices and the furnace hood, a temperature measuring device is provided on the furnace hood, and the driving rotating shaft, the heating devices are connected to a power cabinet.

[0006] Further, the furnace hood is composed of two or more furnace hood units, the height of the furnace hood unit matches the height of the outer side wall of the electrolytic cell, a plurality of furnace hood units enclose the outer side wall of the electrolytic cell for one week. After the furnace hood units are closed, the furnace hood completely covers the outer side wall of the electrolytic cell, and the rotation angle of the furnace hood unit is 0 - 120°.

[0007] Further, when there are two furnace hood units, the furnace hood units are semi-circular, and the driving rotating shafts are respectively fixedly connected to the same side or adjacent side ends of each furnace hood unit.

[0008] Furthermore, when there are two or more hood units, the hood units are arc-shaped, and the driving rotating shafts are fixedly connected to the same side or the adjacent side ends of each hood unit respectively.

[0009] Furthermore, the heating device is a heating rod, and a plurality of heating rods are provided in each hood unit, and an insulating ceramic sleeve is sleeved outside the heating rod.

[0010] Furthermore, the heating rods are vertically arranged parallel to the outer side wall of the electrolytic cell, and a plurality of heating rods are evenly distributed around the outer side wall of the electrolytic cell.

[0011] Furthermore, a plurality of heating rods are connected to each other through power connection wires, and the wire connection mode between a plurality of heating rods is star connection or delta connection.

[0012] Furthermore, the hood unit and the driving rotating shaft are fixed on a base, and a guiding device for the movement of the hood unit is provided between the bottom of the hood unit and the base.

[0013] Furthermore, the power of the heating furnace is:

[0014]

[0015] Wherein: P is the required power of the electric heater, in kW; C is the specific heat of the heated medium, in kcal / (kg•°C); M is the mass of the heated medium, in kg; ΔT is the difference between the set temperature and the initial temperature, in °C; t is the specified time for heating the medium from the initial temperature to the set temperature, in h; S is the safety factor.

[0016] The beneficial effects of the present invention are as follows:

[0017] For the auxiliary heating furnace for the electrolytic cell of the present invention, by arranging an openable auxiliary heating furnace around the electrolytic cell and heating and melting the cold materials in the electrolytic cell by means of electric heating, the traditional start-up method, workshop layout and operation system are changed. At the same time, the additional heat required in the processes of pole changing, discharging and feeding in production is further compensated by the heating furnace, effectively ensuring the dynamic balance of energy in the production process. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the auxiliary heating furnace for the electrolytic cell when the hood units open and close in the same direction in the present invention;

[0019] Figure 2 It is a schematic structural diagram of the auxiliary heating furnace for the electrolytic cell with the opposite-opening hood units in the present invention;

[0020] Figure 3 It is a schematic diagram of the star connection of the heating rods;

[0021] Figure 4 It is a schematic diagram of the triangular wiring of the heating rod.

[0022] In the figure: 1. Furnace cover, 2. Heat insulation cotton, 3. Heating rod, 4. Insulating ceramic sleeve, 5. Power connection wire, 6. Temperature measuring thermocouple, 7. Furnace cover guide rail, 8. Welding bolt, 9. Gasket, 10. Nut, 11. Power cabinet, 12. Driving cylinder, 13. Electrolytic cell. Specific implementation mode

[0023] In order to better explain the present invention for easy understanding, the present invention will be described in detail below in conjunction with the accompanying drawings through specific implementation modes.

[0024] The present invention provides an auxiliary heating furnace for an electrolytic cell, as Figure 1-2 shown, which includes a furnace cover 1. The furnace cover 1 is arranged around the outer side wall of the electrolytic cell 13. The furnace cover 1 is composed of several furnace cover units. One side of each furnace cover unit is fixedly connected to a driving rotating shaft. The several furnace cover units are arranged in a ring with the electrolytic cell 13 as the center. When the furnace cover units are closed, they surround the outer side wall of the electrolytic cell 13 for one week. On the side of the furnace cover facing the electrolytic cell 13, there are several heating devices. There is heat insulation cotton 2 between the heating devices and the furnace cover. A temperature measuring device is arranged on the furnace cover, specifically a temperature measuring thermocouple 6, which is used to monitor the heating temperature of the heating furnace. The driving rotating shaft, the heating device are connected to the power cabinet 11.

[0025] Specifically, the furnace cover 1 is composed of two or more furnace cover units. The height of the furnace cover unit matches the height of the outer side wall of the electrolytic cell 13. The several furnace cover units enclose the outer side wall of the electrolytic cell 13 for one week. After the furnace cover units are closed, the furnace cover 1 completely covers the outer side wall of the electrolytic cell 13, and the electrolytic cell 13 is completely placed inside the part surrounded by the furnace cover 1. The rotation angle of the furnace cover unit is 0-120°. More specifically, when there are two furnace cover units, the furnace cover units are in two semi-circular shapes. The two driving rotating shafts are vertically arranged and are respectively fixedly connected to the same side or adjacent side ends of each furnace cover unit. When the two driving rotating shafts are respectively connected to the same side of each furnace cover unit, as Figure 1 shown, the opening mode of the furnace cover unit is the same-direction opening and closing. When the two driving rotating shafts are respectively connected to the adjacent sides of each furnace cover unit, as Figure 2As shown, the hood unit is opened in a split manner. The driving rotary shaft can be a driving cylinder 12 connected to the rotary shaft to drive the rotary shaft. When there are two or more hood units, the hood units are arc-shaped, and the driving rotary shafts are respectively fixedly connected to the same side or adjacent side ends of each hood unit to form a multi-petal hood unit structure. The opening and closing methods of two adjacent hood units can be split or opened and closed in the same direction. The hood unit and the driving rotary shaft are fixed on a base. To make the opening and closing of the hood unit stable, a guiding device for the movement of the hood unit can be provided between the bottom of the hood unit on the side far from the driving rotary shaft and the base. Specifically, the guiding device can be a protrusion provided at the bottom of the hood unit on the side far from the driving rotary shaft, and a slideway matching the protrusion is provided on the base to achieve the stable opening and closing of the hood unit.

[0026] Specifically, several heating rods 3 are provided on the side of the hood unit close to the electrolytic cell 13. The heating rods 3 are vertically arranged parallel to the outer wall of the electrolytic cell 13, and several heating rods 3 are evenly distributed around the outer wall of the electrolytic cell 13. An insulating ceramic sleeve 4 is sleeved outside the heating rods 3, and the heating rods 3 pass through the insulating ceramic sleeves 4 and are clamped on the hood 1. The several heating rods 3 are connected to each other through power connection wires 5. As Figure 3 shown, the wire connection method between the several heating rods 3 is star connection. As Figure 4 shown, or it is delta connection.

[0027] Specifically, the heat-insulating cotton 2 is pressed against the inner wall of the hood 1 in a bolted connection form of welding bolts 8, washers 9, and nuts 10.

[0028] Specifically, the power of the heating furnace is:

[0029]

[0030] In the formula: P is the required power of the electric heater, in kW; C is the specific heat of the heated medium, in kcal / (kg•°C); M is the mass of the heated medium, in kg; ΔT is the difference between the set temperature and the initial temperature, in °C; t is the specified time for heating the medium from the initial temperature to the set temperature, in h; S is the safety factor.

[0031] The operation process of the auxiliary heating furnace for the electrolytic cell of the present invention is as follows: Before the electrolytic cell 13 is started, a measured amount of cold electrolyte is first added to the heating furnace of the electrolytic cell 13. The hood 1 of the auxiliary heating furnace is closed, and power is supplied to raise the temperature. After the electrolyte in the electrolytic cell 13 is heated and melted, the auxiliary heating furnace is switched to the heat preservation state. The electrolytic cell 13 is powered on and started, and gradually rises to the production requirement intensity, and then the auxiliary heating furnace is closed.

[0032] When the electrolytic cell 13 performs operations such as pole changing, feeding, and discharging, according to the production temperature requirements, the auxiliary heating furnace is started to heat the electrolytic cell 13 and supplement energy. In addition, when the temperature inside the electrolytic cell 13 exceeds the normal production temperature, the furnace hood 1 of the auxiliary heating furnace can be opened for heat dissipation to maintain the temperature required for the normal production of the electrolytic cell 13.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Modifications, alterations, substitutions, and variations made by those of ordinary skill in the art to the above embodiments all fall within the scope of the present invention.

Claims

1. An auxiliary heating furnace for an electrolytic cell, characterized in that: The invention comprises a furnace cover (1), wherein the furnace cover (1) is arranged around the outer wall of an electrolytic cell, the furnace cover (1) is composed of a plurality of furnace cover units, one side of each furnace cover unit is fixedly connected to a driving rotating shaft, the plurality of furnace cover units are arranged in a ring with the electrolytic cell as the center, and when the furnace cover unit is closed, the furnace cover unit surrounds the outer wall of the electrolytic cell, a plurality of heating devices are arranged on the side of the furnace cover (1) facing the electrolytic cell, and heat insulation cotton (2) is arranged between the heating device and the furnace cover (1), a temperature measuring device is arranged on the furnace cover (1), and the driving rotating shaft and the heating device are connected to a power cabinet (11); the heating device is a heating rod (3), each furnace cover unit is provided with a plurality of heating rods (3), and the heating rod (3) is externally sheathed with an insulating ceramic sleeve (4); the heating rod (3) is vertically arranged parallel to the outer wall of the electrolytic cell, and the plurality of heating rods (3) are evenly distributed around the outer wall of the electrolytic cell.

2. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The furnace hood (1) is composed of two or more furnace hood units, the height of the furnace hood units matches the height of the outer wall of the electrolytic cell, and a plurality of furnace hood units surround the outer wall of the electrolytic cell. When the furnace hood units are closed, the furnace hood (1) completely covers the outer wall of the electrolytic cell, and the rotation angle of the furnace hood units is 0-120°.

3. The auxiliary heating furnace for an electrolytic cell according to claim 2, characterized in that: When there are two furnace hood units, the furnace hood units are semicircular, and the driving rotating shaft is fixedly connected to the same side or adjacent side ends of each furnace hood unit.

4. The auxiliary heating furnace for an electrolytic cell according to claim 2, characterized in that: When there are more than two furnace cover units, the furnace cover units are arc-shaped, and the driving rotating shaft is fixedly connected to the same side or adjacent side ends of each furnace cover unit.

5. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The plurality of heating rods (3) are connected to each other via power connection wires (5), and the connection mode of the wires between the plurality of heating rods (3) is a star connection or a triangle connection.

6. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The furnace cover unit and the driving rotating shaft are fixed on a base, and a guiding device for the furnace cover unit to move is arranged between the bottom of the furnace cover unit and the base.

7. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The heating furnace power is: ； In the formula: P is the power required by the electric heater, kW; C is the specific heat of the heated medium, kcal / (kg•℃); M is the mass of the heated medium, kg; ΔT is the difference between the set temperature and the initial temperature in ℃; t is the time required to heat the medium from the initial temperature to the set temperature, h; S is the safety factor.

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