Granulation kiln heat utilization device for lithium battery negative electrode material production

Abstract

The utility model discloses a granulation kiln heat utilization device for lithium battery cathode material production, which comprises a hot air pipeline assembly connected with high-temperature section equipment and low-temperature section equipment, one end of the hot air pipeline assembly is communicated with the high-temperature section equipment, and the other end of the hot air pipeline assembly is communicated with the low-temperature section equipment; the low-temperature section equipment is connected with an induced draft fan, and hot air of the high-temperature section equipment is guided to the low-temperature section equipment through the hot air pipeline assembly by means of the induced draft fan. According to the heat utilization device, high-temperature hot air of the high-temperature section is conducted to the low-temperature section to heat the furnace barrel of the low-temperature section, and energy consumption of equipment is reduced. The device is simple in structure, stable in performance, convenient to maintain and capable of reducing enterprise production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of production of lithium battery negative electrode materials, in particular to a granulation kiln heat utilization device for production of lithium battery negative electrode materials. Background Art

[0002] With the rapid development of the new energy industry, the demand for lithium-ion batteries continues to grow. As a key component of lithium-ion batteries, the performance of negative electrode materials directly affects the overall performance of the battery. During the operation of lithium-ion batteries, negative electrode materials need to have good conductivity, high specific capacity, stable structure and suitable particle morphology. The current negative electrode production process has to go through four major processes: crushing, granulation, graphitization and screening. Among them, granulation is an important production process. Granulation is to use specific process means to aggregate fine negative electrode material particles into larger spherical or quasi-spherical particles in a granulation kiln or reactor, regulate the size and void structure of the particles, further optimize the performance of the negative electrode material, and meet the needs of lithium-ion batteries in different application scenarios.

[0003] Existing granulation kilns used for negative electrode material production typically place materials within a horizontal, rotating rotary kiln. Following the general granulation production process, the kiln is divided into preheating, granulation, and cooling stages. Materials enter the kiln through a rotating drum structure, transported by a spiral belt within the kiln. As the material moves within the drum, it is stirred by a rotating plate for even heating. The material is heated primarily by high-resistance alloy wire heating elements located at the bottom of the drum. Because the kiln layout aligns with the production process, the preheating and granulation stages are arranged separately. In actual production, the preheating stage primarily raises the kiln temperature from room temperature to a certain residual heat temperature to remove moisture and volatiles from the material while gradually acclimating it to the subsequent high-temperature processing environment. The preheating temperature typically ranges from 100°C to 350°C, and the duration varies depending on the nature and quantity of the material, ranging from tens of minutes to several hours. The granulation stage raises the temperature to between 350°C and 650°C. This stage lasts longer, further changing the physical and chemical properties of the material and ensuring that the particles are fully formed.

[0004] However, in actual production, the two heating stages of existing granulation kilns are arranged separately. While the temperature requirement for the first stage is not high, both sections still need to be heated, resulting in heat loss and waste in the high-temperature section, increasing energy consumption. To further reduce equipment operating costs and promote cost reduction and efficiency improvement for enterprises, based on the above technical issues, technicians in this field urgently need to develop a heat utilization device for granulation kilns used in the production of lithium battery negative electrode materials. Utility Model Content

[0005] The purpose of this utility model is to provide a heat utilization device for a granulation kiln used in the production of lithium battery negative electrode materials. This device transfers high-temperature hot air from the high-temperature section to the low-temperature section to heat the furnace drum in the low-temperature section, thereby reducing the equipment's energy consumption. The device has a simple structure, stable performance, and is easy to maintain, thereby reducing production costs for enterprises.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] The utility model discloses a heat utilization device for a granulation kiln used in the production of lithium battery negative electrode materials. The device is arranged between a low-temperature section device and a high-temperature section device, and utilizes the device to transfer part of the heat of the high-temperature section device to the low-temperature section device to heat the low-temperature section device.

[0008] The device comprises:

[0009] A hot air duct assembly connecting the high-temperature section equipment and the low-temperature section equipment, wherein one end of the hot air duct assembly is connected to the high-temperature section equipment and the other end is connected to the low-temperature section equipment;

[0010] The low-temperature section equipment is connected to an induced draft fan, which is used to guide the hot air from the high-temperature section equipment to the low-temperature section equipment through the hot air duct assembly.

[0011] Furthermore, the low temperature section equipment includes:

[0012] Low temperature furnace drum; and

[0013] A low-temperature section heat-insulating outer cover provided on the outside of the low-temperature section furnace;

[0014] The low-temperature section heat-insulating outer cover is provided with a low-temperature section hot air inlet at one end close to the high-temperature section equipment, and a low-temperature section hot air outlet at one end away from the high-temperature section equipment;

[0015] The hot air outlet of the low temperature section is communicated with an external induced draft fan.

[0016] Furthermore, the inner diameter of the low-temperature section heat-insulating outer cover is larger than the outer diameter of the low-temperature section furnace barrel;

[0017] The hot air duct assembly is communicated with the space between the low temperature section heat insulation cover and the low temperature section furnace drum through the low temperature section hot air inlet.

[0018] Furthermore, the high temperature section equipment includes:

[0019] High temperature furnace drum; and

[0020] A high-temperature section heat-insulating outer cover provided on the outside of the high-temperature section furnace;

[0021] The high temperature section heat preservation outer cover is provided with a high temperature section hot air outlet at one end close to the low temperature section equipment, and a high temperature section hot air inlet at one end away from the low temperature section equipment;

[0022] The hot air duct assembly is in communication with the high-temperature section hot air outlet.

[0023] Furthermore, the inner diameter of the high temperature section heat insulation cover is larger than the outer diameter of the high temperature section furnace barrel;

[0024] The hot air duct assembly is communicated with the space between the high temperature section heat insulation cover and the high temperature section furnace drum through the high temperature section hot air outlet.

[0025] Furthermore, the hot air duct assembly includes:

[0026] Hot air ducts connected to the low-temperature section hot air inlet and the high-temperature section hot air outlet respectively; and

[0027] A hot air duct expansion joint connected between the two hot air ducts;

[0028] A hot air duct insulation layer is provided outside the hot air duct.

[0029] Furthermore, the hot air duct is made of carbon steel;

[0030] The hot air duct insulation layer is a composite layer composed of an aluminum silicate fiber blanket and a standard refractory fiber blanket.

[0031] In the above technical solution, the utility model provides a granulation kiln heat utilization device for producing lithium battery negative electrode materials, which has the following beneficial effects:

[0032] This utility model's heat utilization device transfers high-temperature hot gas from the high-temperature section to the low-temperature section to heat the furnace drum in the low-temperature section, reducing the equipment's energy consumption. The device has a simple structure, stable performance, and is easy to maintain, reducing production costs for enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0034] Figure 1 This is a structural schematic diagram of a granulation kiln heat utilization device for producing lithium battery negative electrode materials disclosed in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 100, low temperature section equipment; 200, high temperature section equipment;

[0037] 1. Low-temperature section furnace drum; 2. Low-temperature section insulation cover; 3. Low-temperature section hot air outlet; 4. Low-temperature section hot air inlet; 5. Hot air duct insulation layer; 6. Hot air duct; 7. Hot air duct expansion joint; 8. High-temperature section hot air outlet; 9. High-temperature section insulation cover; 10. High-temperature section hot air inlet; 11. High-temperature section furnace drum. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] See also Figure 1 As shown;

[0040] This embodiment discloses a heat utilization device for a granulation kiln used in the production of lithium battery negative electrode materials. The device is arranged between a low-temperature section device 100 and a high-temperature section device 200, and uses the device to transfer part of the heat of the high-temperature section device 200 to the low-temperature section device 100 to heat the low-temperature section device.

[0041] The device includes:

[0042] A hot air duct assembly connecting the high-temperature section equipment 200 and the low-temperature section equipment 100, wherein one end of the hot air duct assembly is connected to the high-temperature section equipment 200 and the other end is connected to the low-temperature section equipment 100;

[0043] The low-temperature section equipment 100 is connected to an induced draft fan, which guides the hot air from the high-temperature section equipment 200 to the low-temperature section equipment 100 through the hot air duct assembly.

[0044] Specifically, this embodiment discloses a heat utilization device that can transfer some of the heat from the high-temperature section equipment 200 to the low-temperature section equipment 100, thereby recovering and reusing waste heat. The heat utilization device of this embodiment is disposed between the low-temperature section equipment 100 and the high-temperature section equipment 200. It utilizes an induced draft fan at one end of the low-temperature section equipment 100 to direct hot air from the high-temperature section equipment 200 to the low-temperature section equipment 100, thereby achieving the design goal of heat utilization.

[0045] Preferably, the low-temperature section equipment 100 of this embodiment includes a low-temperature section furnace drum 1; and a low-temperature section heat-insulating outer cover 2 provided outside the low-temperature section furnace drum 1;

[0046] The low-temperature section heat preservation outer cover 2 is provided with a low-temperature section hot air inlet 4 at one end close to the high-temperature section equipment 200, and a low-temperature section hot air outlet 3 at one end away from the high-temperature section equipment 200;

[0047] The low-temperature section hot air outlet 3 is connected to the external induced draft fan.

[0048] More preferably, the inner diameter of the low-temperature section heat-insulating outer cover 2 of this embodiment is larger than the outer diameter of the low-temperature section furnace drum 1;

[0049] The hot air duct assembly is connected to the space between the low-temperature section heat preservation cover 2 and the low-temperature section furnace drum 1 through the low-temperature section hot air inlet 4 .

[0050] Preferably, the high temperature section equipment 200 of this embodiment includes a high temperature section furnace drum 11; and a high temperature section heat preservation cover 9 provided outside the high temperature section furnace drum 11;

[0051] The high temperature section heat preservation outer cover 9 is provided with a high temperature section hot air outlet 8 at one end close to the low temperature section equipment 100, and a high temperature section hot air inlet 10 at the other end away from the low temperature section equipment 100;

[0052] The hot air duct assembly is connected to the high-temperature section hot air outlet 8.

[0053] Among them, it is more preferred that the inner diameter of the high temperature section heat insulation cover 9 of this embodiment is larger than the outer diameter of the high temperature section furnace drum 11;

[0054] The hot air duct assembly is connected to the space between the high temperature section heat preservation cover 9 and the high temperature section furnace drum 11 through the high temperature section hot air outlet 8 .

[0055] Based on the structures of the aforementioned low-temperature section equipment 100 and high-temperature section equipment 200, this embodiment further defines the composition of the hot air duct assembly. To connect the low-temperature section insulation housing 2 and the high-temperature section insulation housing 9 on either side, the hot air duct assembly of this embodiment includes a hot air duct 6 connected to the low-temperature section hot air inlet 4 and the high-temperature section hot air outlet 8, respectively; and a hot air duct expansion joint 7 connected between the two hot air ducts 6. Considering that the transmission of hot air may cause internal gas to expand as the temperature rises, to further improve the service life of the hot air duct assembly, a hot air duct expansion joint 7 is provided between the two hot air ducts 6 to adapt to changes in airflow temperature. A hot air duct insulation layer 5 is provided on the outside of the hot air duct 6.

[0056] The hot air duct 6 of this embodiment is made of carbon steel; the hot air duct insulation layer 5 is made of a composite layer composed of an aluminum silicate fiber blanket and a standard refractory fiber blanket.

[0057] The heat utilization device of the granulation kiln in this embodiment transmits the heat generated by the high-temperature section equipment 200 to the low-temperature section equipment 100 under the action of the induced draft fan through a heat-sealed pipe assembly, which can be used for heating the low-temperature section, realizing heat recovery and reuse, and reducing dependence on the low-temperature section electric heating device. This heat recycling can significantly improve the energy utilization efficiency of the entire equipment and reduce the overall energy consumption.

[0058] The heat utilization device of this embodiment reduces the operating time of the existing electric heating device and reduces power consumption, thereby lowering energy costs during the production process. Furthermore, the existing electric heating device in the low-temperature section serves as a backup, increasing the reliability of equipment operation. If the heat transmission pipeline fails or the high-temperature section's heat supply is insufficient, the electric heating device can be activated promptly to ensure that the low-temperature section's heating needs are met, avoiding equipment downtime and ensuring production continuity.

[0059] In the above technical solution, the utility model provides a granulation kiln heat utilization device for producing lithium battery negative electrode materials, which has the following beneficial effects:

[0060] This utility model's heat utilization device transfers high-temperature hot gas from the high-temperature section to the low-temperature section to heat the furnace drum in the low-temperature section, reducing the equipment's energy consumption. The device has a simple structure, stable performance, and is easy to maintain, reducing production costs for enterprises.

[0061] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A heat utilization device for a granulation kiln for producing lithium battery negative electrode materials, characterized in that: The device is arranged between the low-temperature section equipment (100) and the high-temperature section equipment (200), and utilizes the device to transfer part of the heat of the high-temperature section equipment (200) to the low-temperature section equipment (100) to heat the low-temperature section equipment (100); The device comprises: a hot air duct assembly connecting the high-temperature section equipment (200) and the low-temperature section equipment (100), wherein one end of the hot air duct assembly is in communication with the high-temperature section equipment (200) and the other end is in communication with the low-temperature section equipment (100); The low-temperature section equipment (100) is connected to an induced draft fan, and the induced draft fan is used to guide the hot air of the high-temperature section equipment (200) to the low-temperature section equipment (100) through the hot air duct assembly.

2. The heat utilization device of a granulation kiln for producing lithium battery negative electrode materials according to claim 1, characterized in that: The low temperature section equipment (100) comprises: a low temperature section furnace drum (1); and A low-temperature section heat-insulating outer cover (2) provided outside the low-temperature section furnace drum (1); The low-temperature section heat-insulating outer cover (2) is provided with a low-temperature section hot air inlet (4) at one end close to the high-temperature section equipment (200), and the low-temperature section heat-insulating outer cover (2) is provided with a low-temperature section hot air outlet (3) at one end away from the high-temperature section equipment (200); The low-temperature section hot air outlet (3) is communicated with an external induced draft fan.

3. The heat utilization device of a granulation kiln for producing lithium battery negative electrode materials according to claim 2, characterized in that: The inner diameter of the low-temperature section heat-insulating outer cover (2) is larger than the outer diameter of the low-temperature section furnace drum (1); The hot air duct assembly is connected to the space between the low-temperature section heat-insulating outer cover (2) and the low-temperature section furnace drum (1) through the low-temperature section hot air inlet (4).

4. The heat utilization device of a granulation kiln for producing lithium battery negative electrode materials according to claim 2, characterized in that: The high temperature section equipment (200) comprises: a high temperature section furnace drum (11); and A high-temperature section heat-insulating outer cover (10) disposed outside the high-temperature section furnace drum (11); The high-temperature section heat-insulating outer cover (9) is provided with a high-temperature section hot air outlet (8) at one end close to the low-temperature section equipment (100), and the high-temperature section heat-insulating outer cover (9) is provided with a high-temperature section hot air inlet (10) at one end away from the low-temperature section equipment (100); The hot air duct assembly is in communication with the high-temperature section hot air outlet (8).

5. The heat utilization device of a granulation kiln for producing lithium battery negative electrode materials according to claim 4, characterized in that: The inner diameter of the high-temperature section heat-insulating outer cover (9) is larger than the outer diameter of the high-temperature section furnace drum (11); The hot air duct assembly is connected to the space between the high-temperature section heat-insulating outer cover (9) and the high-temperature section furnace drum (11) through the high-temperature section hot air outlet (8).

6. The heat utilization device of a granulation kiln for producing lithium battery negative electrode materials according to claim 4, characterized in that: The hot air duct assembly comprises: a hot air duct (6) connected to the low-temperature section hot air inlet (4) and the high-temperature section hot air outlet (8), respectively; and a hot air duct expansion joint (7) connected between the two hot air ducts (6); A hot air duct insulation layer (5) is provided outside the hot air duct (6).

7. The heat utilization device of a granulation kiln for producing lithium battery negative electrode materials according to claim 6, characterized in that: The hot air duct (6) is a carbon steel duct; The hot air duct insulation layer (5) is a composite layer composed of an aluminum silicate fiber blanket and a standard refractory fiber blanket.

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