Furnace inlet air preheating device based on lithium battery positive electrode material

Abstract

The utility model discloses a kiln air inlet preheating device based on lithium battery positive electrode materials, which comprises a kiln, an air outlet of the kiln is connected with a kiln air outlet pipeline, and an air inlet of the kiln is connected with a kiln air inlet pipeline. The kiln body is provided with a second pressure difference detection point, and the kiln exhaust pipeline is provided with a first pressure difference detection point; the first heat exchanger is respectively connected with the kiln gas inlet pipeline and the kiln gas outlet pipeline, and the kiln gas inlet pipeline and the kiln gas outlet pipeline exchange heat in the first heat exchanger; two ends of the differential pressure detection device are respectively connected with the first differential pressure detection point and the second differential pressure detection point; the exhaust fan is arranged on an exhaust pipeline of the kiln and is used for exhausting waste gas in the kiln; the frequency converter is electrically connected with the exhaust fan to adjust the working frequency of the frequency converter; and the controller is in electric signal connection with the frequency converter and the differential pressure detection device. According to the utility model, the cooling replacement of high-temperature gas is realized, so that the process gas inlet temperature of the furnace body is effectively controlled.

Description

Technical Field

[0001] This utility model relates to the field of industrial exhaust gas recovery and reuse technology, and more specifically, to a furnace inlet preheating device based on lithium battery cathode material. Background Technology

[0002] With the rapid development of modern industry, achieving production automation and low carbon emissions is our primary task. Currently, we are improving the functionality of equipment in the production process, gradually optimizing and upgrading control functions, and further improving structural design. Currently, lithium-ion battery cathode material production lines mainly use roller furnaces and rotary kilns. Because roller furnaces require high-temperature combustion of materials, the exhaust temperature is approximately 100℃-130℃, and the gas is directly discharged outdoors. During the sintering process in the kiln, a certain atmosphere needs to be maintained inside for sintering. Generally, oxygen or compressed air is added. Since the inlet air temperature is usually room temperature, excessive air intake will lead to excessively high heating rod power in the heating zone, resulting in high energy consumption and a certain degree of resource waste.

[0003] Therefore, how to provide a device for preheating the kiln intake air using kiln exhaust has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to provide a device for preheating the kiln intake air using kiln exhaust.

[0005] This utility model provides a furnace inlet preheating device based on lithium battery cathode material, including a furnace, an exhaust port connected to a furnace exhaust pipe, and an inlet connected to a furnace inlet pipe; a second differential pressure detection point is provided on the furnace body, and a first differential pressure detection point is provided on the furnace exhaust pipe; a first heat exchanger is connected to both the furnace inlet pipe and the furnace exhaust pipe, and heat exchange occurs between the two pipes; a differential pressure detection device is connected at both ends to the first and second differential pressure detection points; and an exhaust fan is installed on the furnace exhaust pipe to discharge waste gas from the furnace.

[0006] The frequency converter is electrically connected to the exhaust fan to adjust the operating frequency of the frequency converter;

[0007] The controller is electrically connected to the frequency converter and the differential pressure detection device, respectively.

[0008] Optionally, the kiln interior includes multiple working sections arranged sequentially along the conveying direction, with each working section having an exhaust port;

[0009] The kiln exhaust pipe includes a main exhaust pipe and exhaust branch pipes. Each exhaust port is connected to an exhaust branch pipe, and multiple exhaust branch pipes are connected in parallel and are all connected to the main exhaust pipe.

[0010] The exhaust manifold is connected to the first heat exchanger.

[0011] Optionally, one air inlet may be provided for each work section;

[0012] The kiln air intake pipeline includes a main air intake pipe and branch air intake pipes. Each air intake port is connected to a corresponding branch air intake pipe. Multiple branch air intake pipes are connected in parallel and are all connected to the main air intake pipe.

[0013] The intake manifold is connected to the first heat exchanger.

[0014] Optionally, the furnace air preheating device based on lithium battery cathode material also includes an auxiliary air intake main pipe and auxiliary air intake branch pipes, with multiple auxiliary air intake branch pipes provided.

[0015] Each air inlet is connected to an auxiliary air inlet branch pipe, and the other end of the multiple auxiliary air inlet branch pipes is connected to the auxiliary air inlet main pipe.

[0016] The auxiliary air intake manifold is used to supplement air into the kiln.

[0017] Optionally, the furnace inlet preheating device based on lithium battery cathode material also includes a second heat exchanger, which is located downstream of the first heat exchanger and connected to the furnace exhaust pipe.

[0018] The auxiliary air intake manifold is connected to the second heat exchanger to exchange heat with the kiln exhaust pipe.

[0019] Optionally, the first heat exchanger may include a plate heat exchanger or a shell-and-tube heat exchanger.

[0020] Optionally, a filter is provided on the air inlet side of the exhaust fan.

[0021] Based on the technical content disclosed in this utility model, the following beneficial effects are achieved:

[0022] This utility model provides a preheating device for the inlet air of a kiln based on lithium-ion battery cathode materials. The kiln exhaust pipe is connected to a heat exchanger, and then to an exhaust fan. The kiln process air inlet pipe is also connected to the heat exchanger, and then from the heat exchanger to each temperature zone of the kiln. This ensures the inlet air temperature achieves a preheating function, thereby reducing kiln power consumption. A differential pressure detection device is connected at both ends to a first and a second differential pressure detection point to detect the kiln gas pressure difference. A controller is connected to the frequency converter and the differential pressure detection device's electrical signals. The controller adjusts the frequency converter's operating frequency in real time based on the detection value from the differential pressure detection device, ensuring that the furnace pressure and exhaust gas remain within the optimal operating range.

[0023] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0025] Figure 1 This is a structural diagram of the furnace inlet preheating device based on lithium battery cathode material according to this utility model.

[0026] Explanation of reference numerals in the attached drawings: 1. Exhaust fan exhaust pipe; 2. Exhaust fan; 3. Exhaust fan inlet pipe; 4. First heat exchanger; 51. Exhaust main pipe; 52. Exhaust branch pipe; 6. Kiln; 71. Inlet main pipe; 72. Inlet branch pipe; 8. Frequency converter; 9. First differential pressure detection point; 10. Second differential pressure detection point. Detailed Implementation

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0030] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0032] See Figure 1 This utility model discloses a kiln air preheating device based on lithium battery cathode material, including an exhaust fan 2, a kiln 6, a first heat exchanger 4, a frequency converter 8, a kiln exhaust pipe, and a kiln air inlet pipe.

[0033] The kiln exhaust pipe includes an exhaust main pipe 51 and an exhaust branch pipe 52; the kiln air intake pipe includes an air intake main pipe 71 and an air intake branch pipe 72.

[0034] The kiln 6 includes multiple operating sections arranged sequentially along the conveying direction. Each operating section has one exhaust port and one air inlet. Each exhaust port is connected to an exhaust branch pipe 52, and multiple exhaust branch pipes 52 are connected in parallel and all connected to the exhaust main pipe 51. The exhaust main pipe 51 is connected to the first heat exchanger 4. Each air inlet is connected to an air inlet branch pipe 72, and multiple air inlet branch pipes 72 are connected in parallel and all connected to the air inlet main pipe 71. The air inlet main pipe 71 and the exhaust main pipe 51 exchange heat in the first heat exchanger 4.

[0035] The first differential pressure detection point 9 is set on the kiln exhaust pipe, and the second differential pressure detection point 10 is set on the kiln body 6. The differential pressure detection device (differential pressure gauge) includes a first connecting end and a second connecting end; the first connecting end is connected to the first differential pressure detection point 9, and the second connecting end is connected to the second differential pressure detection point 10, used to detect the differential pressure of the kiln body; the exhaust fan 2 is set on the kiln exhaust pipe, used to discharge the waste gas in the kiln 6; specifically, the outlet of the exhaust fan 2 is connected to the exhaust fan exhaust pipe 1, the first differential pressure detection point 9 is set on the exhaust fan exhaust pipe 1, the inlet of the exhaust fan 2 is connected to the exhaust fan inlet pipe 3, and the exhaust fan inlet pipe 3 is connected to the main inlet pipe 71. A filter (not shown in the figure) is set on the air inlet side of the exhaust fan 2 to prevent foreign objects from entering the exhaust fan 2. The frequency converter 8 is electrically connected to the exhaust fan 2 to adjust the operating frequency of the exhaust fan 2; the controller is electrically connected to the frequency converter 8 and the differential pressure detection device (differential pressure gauge) respectively. The controller adjusts the operating frequency of the frequency converter 8 in real time according to the differential pressure value detected by the differential pressure detection device (differential pressure gauge) to ensure that the differential pressure inside and outside the furnace is always kept within the optimal operating range.

[0036] The preheating device for the furnace 6 based on lithium-ion battery cathode materials also includes an auxiliary air intake manifold 71 and auxiliary air intake branch pipes 72, with multiple auxiliary air intake branch pipes 72. Each air inlet is connected to one auxiliary air intake branch pipe 72, and the other end of the multiple auxiliary air intake branch pipes 72 is connected to the auxiliary air intake manifold 71. The auxiliary air intake manifold 71 is used to supplement air into the furnace 6. When the oxygen supplied to the furnace 6 by the main air intake manifold 71 is insufficient, compressed air or oxygen can be supplemented into the furnace through the auxiliary air intake manifold 71 and the auxiliary air intake branch pipes 72.

[0037] Furthermore, in some embodiments, the preheating device for the furnace 6 based on lithium battery cathode material also includes a second heat exchanger, which is located downstream of the first heat exchanger 4 and connected to the furnace exhaust pipe; the auxiliary air intake manifold 71 is connected to the second heat exchanger and exchanges heat with the furnace exhaust pipe.

[0038] Furthermore, in some embodiments, the first heat exchanger 4 and the second heat exchanger include either a plate heat exchanger or a shell-and-tube heat exchanger.

[0039] 1) Working principle: The exhaust gas inside the kiln 6 is discharged by the blower (exhaust fan 2). The discharged hot gas (exhaust gas) is heated by the heat exchanger, so the temperature of the discharged gas is relatively low. The process gas enters the heat exchanger through the main inlet pipe 71 and the branch inlet pipe 72. After being preheated by the heat exchanger, it enters the kiln body to achieve the function of heating.

[0040] 2) Working process: The exhaust gas inside the furnace is discharged by the blower (exhaust fan 2). The discharged hot gas is heat exchanged through the heat exchanger, so the temperature of the discharged gas is relatively low. The blower speed can be controlled by frequency conversion through the pressure difference inside and outside the kiln. The process gas enters the heat exchanger through the main air inlet pipe 71 and the branch air inlet pipe 72. After being preheated by the heat exchanger, it enters the furnace body to achieve the function of heating.

[0041] The blower is controlled by frequency conversion based on the kiln pressure difference. The controller's control system monitors the kiln pressure difference and exhaust gas pressure difference in real time. According to the kiln pressure set according to the process requirements, the control system controls the motor speed to ensure that the pressure difference in the kiln is stable within the process setting range, and monitors and detects the exhaust gas pressure.

[0042] 3) Operating steps: The blower exhausts the gas from inside the furnace. The exhaust gas is then heated by a heat exchanger, resulting in a lower exhaust gas temperature. The blower speed can be controlled by frequency conversion based on the kiln pressure difference. The process gas enters the heat exchanger through the process gas inlet pipeline. After being preheated by the heat exchanger, the gas enters the furnace to achieve the heating function.

[0043] In summary, the preheating device for furnace inlet gas based on lithium battery cathode material provided by this utility model achieves cooling and replacement of high-temperature gas, thereby effectively controlling the furnace inlet gas temperature and solving the problems of low inlet gas temperature in the furnace heating zone, slow heating rate in the heating section, and high energy consumption.

[0044] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A furnace inlet preheating device based on lithium battery cathode material, characterized in that, include: The kiln has an exhaust port connected to an exhaust pipe and an inlet connected to an inlet pipe; a second differential pressure detection point is provided on the kiln body, and a first differential pressure detection point is provided on the exhaust pipe. The first heat exchanger is connected to the kiln inlet pipe and the kiln exhaust pipe respectively, and the kiln inlet pipe and the kiln exhaust pipe exchange heat in the first heat exchanger. The differential pressure detection device is connected at both ends to the first differential pressure detection point and the second differential pressure detection point, respectively. An exhaust fan is installed on the kiln exhaust pipe to discharge the waste gas inside the kiln; A frequency converter is electrically connected to the exhaust fan to adjust the operating frequency of the frequency converter; The controller is electrically connected to the frequency converter and the differential pressure detection device, respectively.

2. The furnace inlet preheating device based on lithium battery cathode material according to claim 1, characterized in that: The kiln interior includes multiple working sections arranged sequentially along the conveying direction, and each working section is provided with one exhaust port; The kiln exhaust pipe includes a main exhaust pipe and exhaust branch pipes. Each exhaust port is connected to one exhaust branch pipe, and multiple exhaust branch pipes are arranged in parallel and are all connected to the main exhaust pipe. The exhaust manifold is connected to the first heat exchanger.

3. The furnace inlet preheating device based on lithium battery cathode material according to claim 2, characterized in that: Each of the aforementioned work sections is provided with one of the aforementioned air inlets; The kiln air intake pipe includes a main air intake pipe and branch air intake pipes. Each air intake port is connected to one branch air intake pipe, and multiple branch air intake pipes are arranged in parallel and are all connected to the main air intake pipe. The main intake pipe is connected to the first heat exchanger.

4. The furnace inlet preheating device based on lithium battery cathode material according to claim 3, characterized in that: The furnace air inlet preheating device based on lithium battery cathode material also includes an auxiliary air inlet main pipe and auxiliary air inlet branch pipes, and multiple auxiliary air inlet branch pipes are provided. Each of the air inlets is connected to one of the auxiliary air inlet branch pipes, and the other end of the multiple auxiliary air inlet branch pipes is connected to the auxiliary air inlet main pipe; The auxiliary air intake manifold is used to supplement air into the kiln.

5. The furnace inlet preheating device based on lithium battery cathode material according to claim 4, characterized in that: The furnace inlet preheating device based on lithium battery cathode material also includes a second heat exchanger, which is located downstream of the first heat exchanger and connected to the furnace exhaust pipe. The auxiliary air intake manifold is connected to the second heat exchanger and exchanges heat with the kiln exhaust pipe.

6. The furnace inlet preheating device based on lithium battery cathode material according to any one of claims 1 to 4, characterized in that: The first heat exchanger includes a plate heat exchanger or a shell-and-tube heat exchanger.

7. The furnace inlet preheating device based on lithium battery cathode material according to any one of claims 1 to 4, characterized in that: A filter is installed on the air inlet side of the exhaust fan.

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