A waste heat recovery system of a graphitization furnace

Abstract

The utility model discloses a kind of waste heat recovery systems of graphitization furnace in the technical field of waste heat recovery, including furnace tube, and heat conduction plate is arranged on furnace tube;Air guide pipe, air guide pipe is arranged in one side of heat conduction plate, and the air inlet end of air guide pipe is spaced apart from heat conduction plate, to make the air inlet passage between air guide pipe and heat conduction plate;Heat exchange coil pipe, heat exchange coil pipe is arranged in air guide pipe, and one end of heat exchange coil pipe is communicated with water inlet pipe, and the other end of heat exchange coil pipe is communicated with backwater pipe;Pneumatic exhaust fan, pneumatic exhaust fan is arranged in air guide pipe, and pneumatic exhaust fan is located at the end of heat exchange coil pipe away from heat conduction plate;Air deflector, air deflector is covered in the air outlet end of air guide pipe, and air deflector can make the gas flow direction of air guide pipe exhaust heat conduction plate.The utility model adopts the mode of pneumatic drive and circulating heat exchange, not only reduce equipment failure rate, reduce the maintenance cost of equipment, but also can reduce the influence to surrounding environment, to improve waste heat recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically to a waste heat recovery system for a graphitization furnace. Background Technology

[0002] During the graphitization process, the graphitization furnace generates a large amount of waste heat. If this waste heat is not recovered and utilized, it will not only waste energy but also increase production costs and environmental burden. Therefore, the recovery and utilization of waste heat from the graphitization furnace has significant economic value and environmental significance.

[0003] Currently, common waste heat recovery methods for graphitization furnaces generally have certain limitations. For example, the waste heat temperature of graphitization furnaces is high, and the circuits are easily damaged in high-temperature environments, leading to frequent failures of equipment such as motors, significantly increasing maintenance costs, and posing safety hazards. At the same time, the process of guiding hot air into the recovery system is unstable, making it impossible to efficiently and stably introduce hot air into the recovery equipment for heat exchange, resulting in low waste heat recovery efficiency. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a waste heat recovery system for a graphitization furnace to address the above-mentioned technical problems, so as to improve the waste heat recovery efficiency of the graphitization furnace, reduce equipment failures, and lower equipment maintenance costs.

[0005] The technical solution adopted in this utility model is: a waste heat recovery system for a graphitization furnace, comprising:

[0006] Furnace tube, on which a heat-conducting plate is provided;

[0007] An air guide pipe is provided on one side of the heat-conducting plate, and the air inlet end of the air guide pipe is spaced apart from the heat-conducting plate so that an air inlet channel is formed between the air guide pipe and the heat-conducting plate.

[0008] A heat exchange coil is installed inside an air guide pipe, with one end of the heat exchange coil connected to an inlet water pipe and the other end of the heat exchange coil connected to a return water pipe.

[0009] A pneumatic exhaust fan is installed inside the air duct and is located at the end of the heat exchange coil away from the heat conduction plate.

[0010] A flow guide is provided on the outlet end of the air duct, and the flow guide enables the gas discharged from the air duct to flow to the heat guide plate.

[0011] Preferably, a heat exchange plate is provided inside the air guide pipe, and a plurality of heat exchange plates are evenly distributed along the circumference of the air guide pipe, and the heat exchange plates are fixedly connected to the heat exchange coil.

[0012] Preferably, one end of the heat exchange plate extends to the outside of the air duct and is fixedly connected to the heat conduction plate.

[0013] Preferably, there are multiple heat exchange coils, and the multiple heat exchange coils are spaced apart and connected sequentially along the axial direction of the air guide pipe.

[0014] Preferably, each heat exchange coil includes multiple arcuate pipe segments arranged sequentially along the radial direction of the air guide pipe, and two adjacent arcuate pipe segments are connected to each other so that the flow path of the heat exchange fluid in the heat exchange coil is S-shaped.

[0015] Preferably, the inner side of the flow guide shroud is provided with a flow guide cone that is directly opposite the air outlet end of the air guide pipe.

[0016] Preferably, a support rod is connected between the air guide and the air guide pipe, and multiple support rods are evenly distributed along the circumference of the air guide pipe.

[0017] Preferably, the radial dimension of the air inlet end of the air guide tube is greater than the radial dimension of the air outlet end of the air guide tube.

[0018] Preferably, the pneumatic exhaust fan includes a pneumatic motor and an impeller, the pneumatic motor is fixedly connected to the air guide pipe, and the impeller is connected to the power output shaft of the pneumatic motor.

[0019] Preferably, the heat-conducting plate is a boron nitride ceramic plate.

[0020] The beneficial effects of this utility model are:

[0021] This invention employs a pneumatic drive and circulating heat exchange method. A pneumatic exhaust fan drives air to flow from the inlet to the outlet of the gas duct. During this flow, the gas first exchanges heat with the heat-conducting plates on the furnace tube, and then with the heat exchange coils inside the gas duct. This achieves simultaneous gas-solid and gas-liquid heat exchange, improving waste heat recovery efficiency, reducing equipment failure rates, and lowering maintenance costs. Furthermore, a flow guide hood directs the heat-exchanged air back into the gas duct for further heat exchange, minimizing environmental impact and indirectly improving waste heat recovery. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the waste heat recovery system of the graphitization furnace of this utility model;

[0023] Figure 2 This is a cross-sectional view of the waste heat recovery system of the graphitization furnace of this utility model.

[0024] Figure 3A three-dimensional schematic diagram of the waste heat recovery system of the graphitization furnace behind the hidden furnace tubes;

[0025] Figure 4 A cross-sectional view of the waste heat recovery system of the graphitization furnace with the furnace tubes concealed.

[0026] Figure 5 This is a three-dimensional schematic diagram of a heat exchange coil.

[0027] Explanation of the reference numerals in the figure:

[0028] 1. Furnace tube; 2. Heat-conducting plate; 3. Gas duct; 4. Heat exchange coil; 5. Water inlet pipe; 6. Water return pipe; 7. Pneumatic exhaust fan; 8. Flow guide shroud; 9. Heat exchange plate; 10. Flow guide cone; 11. Pneumatic motor; 12. Impeller; 13. Water pump; 14. Support rod; 15. Gas inlet pipe; 16. Gas return pipe. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0030] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] Examples, such as Figures 1-5 As shown, a waste heat recovery system for a graphitization furnace includes:

[0034] Furnace tube 1, on which a heat-conducting plate 2 is installed.

[0035] An air duct 3 is installed on one side of the heat-conducting plate 2, and the air inlet end of the air duct 3 is spaced apart from the heat-conducting plate 2 so that an air inlet channel is formed between the air duct 3 and the heat-conducting plate 2. This air inlet channel is used to allow external air to enter the air duct 3.

[0036] The heat exchange coil 4 is fixedly installed in the inner cavity of the air guide pipe 3, and one end of the heat exchange coil 4 is connected to the water inlet pipe 5, and the other end of the heat exchange coil 4 is connected to the water return pipe 6.

[0037] A pneumatic exhaust fan 7 is fixedly installed in the inner cavity of the air guide pipe 3, and the pneumatic exhaust fan 7 is located at the end of the heat exchange coil 4 away from the heat conduction plate 2, and is used to drive the gas to flow inside the air guide pipe 3.

[0038] The air guide 8 is installed over the outlet end of the air guide pipe 3, and the air guide 8 can make the gas discharged from the air guide pipe 3 flow to the heat guide plate 2, so as to reduce the amount of high temperature gas diffused into the surrounding environment.

[0039] This invention employs a pneumatic drive and circulating heat exchange method. A pneumatic exhaust fan 7 drives air to flow from the inlet to the outlet of the air duct 3. During this flow, the gas first exchanges heat with the heat-conducting plate 2, and then with the heat exchange coil 4, achieving simultaneous gas-solid and gas-liquid heat exchange. This not only improves waste heat recovery efficiency but also reduces equipment failure rate and maintenance costs. Simultaneously, a flow guide 8 guides the heat-exchanged air, allowing it to flow back into the air duct 3 for further heat exchange. This not only reduces the impact on the surrounding environment but also indirectly improves the waste heat recovery rate.

[0040] It should be noted that the arrows in the diagram indicate the direction of gas flow.

[0041] Specific embodiment 1, such as Figures 1-5 As shown, a waste heat recovery system for a graphitization furnace includes:

[0042] Furnace tube 1, with a heat-conducting plate 2 installed at one end of furnace tube 1.

[0043] Preferably, the heat-conducting plate 2 is made of boron nitride ceramic plate.

[0044] The gas duct 3 is located outside the furnace tube 1 and is installed on one side of the heat-conducting plate 2. The gas inlet end of the gas duct 3 is spaced apart from the heat-conducting plate 2 so that an air inlet channel is formed between the gas duct 3 and the heat-conducting plate 2. The air inlet channel is used to allow external air to enter the gas duct 3.

[0045] Preferably, the axis of the gas guide pipe 3 is arranged parallel to the axis of the furnace tube 1, and the distance between the gas inlet end of the gas guide pipe 3 and the heat conduction plate 2 is 10mm, so as to form a 10mm wide air inlet channel between the gas guide pipe 3 and the heat conduction plate 2; when a negative pressure state occurs inside the gas guide pipe 3, the air outside the gas inlet end of the gas guide pipe 3 can enter the gas guide pipe 3 through the air inlet channel, and during the process of the air entering the gas guide pipe 3, the air and the heat conduction plate 2 undergo the first heat exchange.

[0046] More preferably, the radial dimension of the air inlet end of the air duct 3 is larger than the radial dimension of the air outlet end of the air duct 3, so that the air duct 3 is generally funnel-shaped, so that air can flow smoothly into the inner cavity of the air duct 3.

[0047] The heat exchange coil 4 is fixedly installed in the inner cavity of the air guide pipe 3, and one end of the heat exchange coil 4 is connected to the water inlet pipe 5. A water pump 13 is installed on the water inlet pipe 5, and the other end of the heat exchange coil 4 is connected to the return water pipe 6. Under the action of the water pump 13, the heat exchange liquid is driven to circulate between the heat exchange coil 4 and the external equipment to realize the recovery and utilization of waste heat.

[0048] Preferably, there are multiple heat exchange coils 4, and the multiple heat exchange coils 4 are distributed at intervals along the axial direction of the air guide pipe 3, and adjacent heat exchange coils 4 are connected to each other to improve the waste heat recovery efficiency.

[0049] More preferably, each heat exchange coil 4 includes multiple arc-shaped pipe segments, which are arranged sequentially along the radial direction of the air guide pipe 3. Furthermore, along the circumferential direction of the air guide pipe 3, the multiple arc-shaped pipe segments are sequentially connected to each other, and the flow path of the heat exchange liquid in the heat exchange coil 4 is S-shaped, thereby extending the flow path of the heat exchange liquid in the air guide pipe 3 and extending the gas-solid heat exchange time.

[0050] The heat exchange plate 9 is a plurality of heat exchange plates. Each heat exchange plate 9 is fixedly installed in the inner cavity of the air guide pipe 3 along the axial direction of the air guide pipe 3. The plurality of heat exchange plates 9 are evenly distributed along the circumference of the air guide pipe 3, and the heat exchange plates 9 are fixedly connected to the heat exchange coil 4 to improve the gas-solid heat exchange efficiency between the heat exchange coil 4 and the air.

[0051] One end of the heat exchange plate 9 extends along the axial direction of the air duct 3 to the outside of the air duct 3, and the end of the heat exchange plate 9 is fixedly connected to the heat conduction plate 2 to realize the fixed connection between the air duct 3 and the heat conduction plate 2, and improve the heat exchange efficiency between the heat conduction plate 2 and the heat exchange coil 4.

[0052] Preferably, the heat exchange plate 9 is made of aluminum foil.

[0053] A pneumatic exhaust fan 7 is fixedly installed in the inner cavity of the air guide pipe 3, and the pneumatic exhaust fan 7 is located at the end of the heat exchange coil 4 away from the heat conduction plate 2. It is used to drive the gas to flow inside the air guide pipe 3, that is, to drive the air to flow from the air inlet end of the air guide pipe 3 to the air outlet end of the air guide pipe 3.

[0054] Preferably, the pneumatic exhaust fan 7 includes a pneumatic motor 11 and an impeller 12. The pneumatic motor 11 is located inside the air guide pipe 3 and is fixedly connected to the air outlet end of the air guide pipe 3. The impeller 12 is composed of multiple circumferentially distributed fan blades and is connected to the power output shaft of the pneumatic motor 11 so that the pneumatic motor 11 drives the impeller 12 to rotate, thereby driving air to flow in the inner cavity of the air guide pipe 3.

[0055] The pneumatic motor 11 has an air inlet pipe 15 installed at its air inlet end and an air return pipe 16 installed at its air outlet end.

[0056] The air guide shroud 8 has a radial dimension larger than that of the air outlet end of the air guide pipe 3. The air guide shroud 8 is completely covered on the air outlet end of the air guide pipe 3, and the air guide shroud 8 and the air guide pipe 3 are fixedly connected by support rods 14. There are multiple support rods 14, and the multiple support rods 14 are evenly distributed along the circumference of the air guide pipe 3. The air guide shroud 8 can make the air discharged from the air guide pipe 3 flow to the heat guide plate 2, so as to reduce the amount of high temperature gas diffused into the surrounding environment.

[0057] Preferably, a guide cone 10 is provided on the inner side of the guide shroud 8, which is directly opposite the air outlet end of the air duct 3. The radial dimension of the end of the guide cone 10 near the air duct 3 is smaller than the radial dimension of the section of the guide cone 10 away from the air duct 3.

[0058] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0059] This invention solves the problem of circuit damage due to high temperatures by using a pneumatic motor installed inside the air duct, driven by airflow. The waste heat inside the furnace tube (graphitized furnace tube) is transferred to the air through a boron nitride ceramic plate. This allows the pneumatic motor to drive an impeller, carrying hot air from the surface of the boron nitride ceramic plate into the air duct. A heat exchange coil inside the air duct exchanges heat with the hot air. The heat exchange coil is connected to a water pump via an inlet pipe, allowing external cold water to be injected into the heat exchange coil under the pump's action. After heat exchange, the water inside the heat exchange coil is discharged through an outlet pipe, thus achieving the purpose of recovering waste heat from the graphitized furnace tube. A guide shroud is fixed to the outside of the air duct by a support rod. A guide cone welded to the center of the inner surface of the guide shroud is aligned with the air duct, facilitating the coordination of the guide shroud and guide block to guide the air blown out of the air duct.

[0060] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A waste heat recovery system for a graphitization furnace, characterized in that, include: Furnace tube (1), on which a heat-conducting plate (2) is provided; An air guide pipe (3) is provided on one side of a heat-conducting plate (2). The air inlet end of the air guide pipe (3) is spaced apart from the heat-conducting plate (2) so that an air inlet channel is formed between the air guide pipe (3) and the heat-conducting plate (2). Heat exchange coil (4), the heat exchange coil (4) is installed in the air guide pipe (3), and one end of the heat exchange coil (4) is connected to the water inlet pipe (5), and the other end of the heat exchange coil (4) is connected to the water return pipe (6); A pneumatic exhaust fan (7) is installed inside the air duct (3) and the pneumatic exhaust fan (7) is located at the end of the heat exchange coil (4) away from the heat conduction plate (2). A flow guide (8) is provided on the outlet end of the air guide pipe (3), and the flow guide (8) enables the gas discharged from the air guide pipe (3) to flow to the heat guide plate (2).

2. The waste heat recovery system for a graphitization furnace according to claim 1, characterized in that, A heat exchange plate (9) is provided inside the air guide pipe (3). Multiple heat exchange plates (9) are evenly distributed along the circumference of the air guide pipe (3), and the heat exchange plate (9) is fixedly connected to the heat exchange coil (4).

3. The waste heat recovery system for a graphitization furnace according to claim 2, characterized in that, One end of the heat exchange plate (9) extends to the outside of the air duct (3) and is fixedly connected to the heat conduction plate (2).

4. The waste heat recovery system for a graphitization furnace according to claim 1, characterized in that, The number of heat exchange coils (4) is multiple, and the multiple heat exchange coils (4) are arranged at intervals along the axial direction of the air guide pipe (3) and connected in sequence.

5. The waste heat recovery system for a graphitization furnace according to claim 4, characterized in that, Each heat exchange coil (4) includes multiple arcuate pipe segments arranged sequentially in the radial direction of the air guide pipe (3), and two adjacent arcuate pipe segments are connected to each other, so that the flow path of the heat exchange liquid in the heat exchange coil (4) is S-shaped.

6. The waste heat recovery system for a graphitization furnace according to claim 1, characterized in that, The inner side of the air guide shroud (8) is provided with an air guide cone (10) that is directly opposite the air outlet end of the air guide pipe (3).

7. The waste heat recovery system for a graphitization furnace according to claim 6, characterized in that, A support rod (14) is connected between the air guide (8) and the air guide pipe (3), and multiple support rods (14) are evenly distributed along the circumference of the air guide pipe (3).

8. The waste heat recovery system for a graphitization furnace according to claim 1, characterized in that, The radial dimension of the air inlet end of the air guide pipe (3) is greater than the radial dimension of the air outlet end of the air guide pipe (3).

9. The waste heat recovery system for a graphitization furnace according to claim 1, characterized in that, The pneumatic exhaust fan (7) includes a pneumatic motor (11) and an impeller (12). The pneumatic motor (11) is fixedly connected to the air guide pipe (3), and the impeller (12) is connected to the power output shaft of the pneumatic motor (11).

10. The waste heat recovery system for a graphitization furnace according to claim 1, characterized in that, The heat-conducting plate (2) is a boron nitride ceramic plate.

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