A continuous integrated heat treatment system for hydrogen fuel cell carbon paper

Abstract

The utility model discloses a kind of continuous integrated heat treatment systems of hydrogen fuel cell carbon paper, specifically related to hydrogen fuel cell material manufacturing equipment technical field.The system includes unwinding mechanism, continuous carbonization graphitization furnace, first draft device and cutting device, the continuous carbonization graphitization furnace is composed of feeding sealing device, carbonization section, transition zone, graphitization section and discharging sealing device, composite heat insulation structure is provided in transition zone, the composite heat insulation structure includes high-temperature reflection layer, heat insulation layer and temperature buffer layer, which are sequentially arranged from graphitization section to carbonization section direction.The utility model carries out continuous integrated heat treatment to carbon paper, solves the problem of carbon paper brittle crack, and reduces the quantity of split type furnace mouth sealing device;Meanwhile, by setting composite heat insulation structure, double functions of heat preservation and heat insulation are realized, effectively block the heat transfer from graphitization section to carbonization section, keep carbonization section temperature stable, avoid mutual thermal influence of two sections, improve product quality and energy utilization.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon paper equipment for hydrogen fuel cells, and specifically to a continuous integrated heat treatment system for carbon paper in hydrogen fuel cells. Background Technology

[0002] Continuous carbonization furnaces and continuous graphitization furnaces are key thermal equipment for the production of carbon paper for hydrogen fuel cells, and have advantages such as high output, low energy consumption, and good product consistency.

[0003] Carbonization and graphitization are two crucial processes in carbon paper production, completed respectively in continuous carbonization furnaces and continuous graphitization furnaces. Current technologies employ independent continuous carbonization and graphitization systems. The continuous carbonization system includes an unwinding mechanism, a continuous carbonization furnace, a process gas system, a waste discharge system, and a winding mechanism. The continuous graphitization system includes an unwinding mechanism, a continuous graphitization furnace, a process gas system, a waste discharge system, and a slicing mechanism. Carbonized paper is highly brittle, cracking and even breaking during unwinding before and after the continuous graphitization furnace, resulting in poor product quality and low system reliability. Furthermore, the independent operation of the continuous carbonization and graphitization systems requires two separate furnace opening sealing devices, leading to high consumption of process protective gas, high waste gas treatment costs, and high equipment operating costs. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a continuous integrated heat treatment system for carbon paper in hydrogen fuel cells. By setting up a continuous integrated carbonization and graphitization furnace, the carbon paper does not need to be unwound and rewound during the carbonization and graphitization heat treatment process, thus avoiding cracks or breakage caused by the high brittleness of the carbon paper. At the same time, by setting up composite heat insulation units with dual functions of heat preservation and heat insulation in the carbonization and graphitization sections, the heat transfer between the high-temperature graphitization and carbonization sections is effectively isolated, maintaining the temperature stability of the carbonization section, thereby improving the system's thermal efficiency and product consistency.

[0005] To achieve the above objectives, this utility model provides a continuous integrated heat treatment system for carbon paper used in hydrogen fuel cells, comprising an unwinding mechanism, a carbonization and graphitization furnace, a first stretching device, and a cutting device, wherein:

[0006] The unwinding mechanism is used to unwind the carbon paper to be processed and transport it to the carbonization and graphitization furnace.

[0007] A carbonization and graphitization furnace includes a feeding sealing device, a carbonization section, a transition zone, a graphitization section, and a discharging sealing device. The feeding sealing device is located at the inlet end of the carbonization section, and the discharging sealing device is located at the outlet end of the graphitization section. The transition zone is located between the carbonization section and the graphitization section, and a composite heat insulation unit is provided in the transition zone to isolate heat transfer between the carbonization section and the graphitization section. The composite heat insulation unit includes a high-temperature reflective layer, a heat insulation layer, and a temperature buffer layer arranged sequentially from the graphitization section to the carbonization section.

[0008] The first drafting device is located at the outlet end of the carbonization graphitization furnace and is used to draft the carbon paper processed by the carbonization graphitization furnace and transport it to the cutting mechanism.

[0009] A cutting mechanism, located at the outlet end of the first drafting device, is used to cut carbon paper into specified sizes.

[0010] Preferably, both the infeed sealing device and the discharge sealing device adopt an air curtain sealing structure, which includes:

[0011] The sealed enclosure has narrow slits at both ends for carbon paper to pass through.

[0012] The air supply system includes a fan, a gas distribution and pressure stabilizing chamber, and a slit nozzle. The slit nozzle is arranged along the length of the slit channel, and its outlet is inclined toward the inside of the furnace to form a uniform air curtain covering the entire channel cross section.

[0013] An exhaust system, including exhaust ports located at the bottom and / or top of the sealed housing;

[0014] The pressure detection and control system includes a pressure sensor installed inside a sealed enclosure, and a controller that automatically adjusts the air volume of the air supply system or the air valve of the exhaust system based on the feedback signal from the pressure sensor.

[0015] Preferably, the high-temperature reflective layer, the heat insulation layer, and the temperature buffer layer are all provided with through holes that correspond to and match the carbon paper.

[0016] Preferably, the composite heat insulation unit further includes a first air curtain heat insulation device disposed between the high-temperature reflective layer and the heat insulation layer, and a second air curtain heat insulation device disposed between the heat insulation layer and the temperature buffer layer.

[0017] Preferably, both the first air curtain insulation device and the second air curtain insulation device include a gas pipe and a nozzle connected to an external protective gas. The nozzle is connected to the gas pipe and is arranged parallel to the carbon paper running direction. A gas extraction port corresponding to the nozzle is provided on the side of the transition zone opposite to the nozzle. The gas extraction port is connected to a negative pressure extraction system. By adjusting the air intake of the nozzle and the air extraction volume of the negative pressure extraction system, a directional airflow curtain parallel to the carbon paper plane is formed on the upper and lower sides of the carbon paper running channel.

[0018] Preferably, the transition zone is further provided with a temperature monitoring system, which includes multiple temperature sensors disposed on the high-temperature reflective layer, the heat insulation layer, and the temperature buffer layer.

[0019] Preferably, the total thickness of the composite thermal insulation unit is 300-800mm, wherein the high-temperature reflective layer is 50-150mm thick, the thermal insulation layer is 150-400mm thick, and the temperature buffer layer is 100-250mm thick.

[0020] Preferably, the transition zone is further provided with a second drafting device for the secondary drafting of carbon paper.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] (1) This utility model adopts. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a structural block diagram of a continuous integrated heat treatment system for carbon paper in a hydrogen fuel cell according to the present invention.

[0025] Figure 2 This is a cross-sectional view of the transition zone in this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the feeding sealing device (or discharging sealing device) in this utility model;

[0027] Figure 4 This is a cross-sectional view of the carbonization section in this utility model;

[0028] Figure 5 This is a cross-sectional view of the graphitized section in this utility model.

[0029] In the diagram: 1. Unwinding mechanism, 21. Feed sealing device, 22. Carbonization section, 221. First furnace body, 222. Upper heating rod, 223. Lower heating rod, 224. Rotating roller, 225. Side sealing box, 23. Transition zone, 24. Graphitization section, 25. Discharge sealing device, 26. Second drawing device, 3. First drawing device, 4. Cutting device, 5. First guide wheel, 6. Second guide wheel, 71. High-temperature reflective layer, 72. Heat insulation layer, 73. Temperature buffer layer, 74. First air curtain heat insulation device, 75. Second air curtain heat insulation device, 76. Nozzle, 8. Through hole, 91. Sealing box, 92. Slit channel, 93. Slit nozzle, 94. Exhaust port, 95. Pressure sensor. Detailed Implementation

[0030] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way.

[0031] like Figure 1 As shown, this application provides a continuous integrated heat treatment system for carbon paper in hydrogen fuel cells, including an unwinding mechanism 1, a carbonization and graphitization furnace, a first drawing device 3, and a cutting device 4, wherein:

[0032] The unwinding mechanism 1 is used to unwind the carbon paper to be processed and transport the carbon paper to be processed into the carbonization graphitization furnace;

[0033] The graphitization furnace includes a feeding sealing device 21, a carbonization section 22, a transition zone 23, a graphitization section 24, and a discharge sealing device 25. The feeding sealing device 21 is located at the inlet end of the carbonization section 22, and the discharge sealing device 25 is located at the outlet end of the graphitization section 24. The transition zone 23 is located between the carbonization section 22 and the graphitization section 24, and a composite heat insulation unit is provided in the transition zone 23 to isolate heat transfer between the carbonization section 22 and the graphitization section 24. The composite heat insulation unit includes a high-temperature reflective layer 71, a heat insulation layer 72, and a temperature buffer layer 73 arranged sequentially from the graphitization section 24 to the carbonization section 22.

[0034] The first drawing device 3 is set at the outlet end of the carbonization graphitization furnace to draw the carbon paper processed by the carbonization graphitization furnace and transport it to the cutting mechanism.

[0035] The cutting mechanism, which is located at the outlet end of the first stretching device 3, is used to cut the carbon paper into specified specifications.

[0036] In the above embodiments, the total thickness of the composite thermal insulation unit is 300-800 mm, wherein:

[0037] The high-temperature reflective layer 71 is composed of multiple layers of metal reflective screens. The metal reflective screens are made of molybdenum sheets or tungsten sheets. The spacing between two adjacent metal reflective screens is 20-80mm. The interlayer is filled with ceramic fiber. The thickness of the high-temperature reflective layer 71 is 50-150mm.

[0038] The thermal insulation layer 72 is made of lightweight insulation material, which includes at least one of ceramic fiber, nanoporous insulation board or aerogel insulation felt, and the thickness of the thermal insulation layer 72 is 150-400mm.

[0039] The temperature buffer layer 73 is made of heat storage material, including silicon carbide porous ceramic, alumina ceramic or mullite ceramic, and the thickness of the temperature buffer layer 73 is 100-250mm.

[0040] The high-temperature reflective layer 71, the heat insulation layer 72, and the temperature buffer layer 73 are all provided with through holes 8 that correspond to and match the carbon paper. This structure can ensure that the carbon paper is transported forward in the transition zone 23.

[0041] In the above embodiments, in order to facilitate the transport of carbon paper, a first guide wheel 5 is provided between the unwinding mechanism 1 and the carbonized graphitization furnace for guiding and supporting the transport of carbon paper; a second guide wheel 6 is provided between the carbonized graphitization furnace and the first stretching device 3 for guiding and supporting the transport of carbon paper.

[0042] In the above embodiments, by setting the carbonization furnace and graphitization furnace as a continuous integrated carbonization and graphitization furnace, the carbon paper does not need to undergo unwinding and rewinding operations during the carbonization and graphitization heat treatment processes. This avoids the situation where the carbon paper cracks or breaks due to its high brittleness during unwinding and rewinding. At the same time, by setting a composite heat insulation unit with dual functions of heat preservation and heat insulation in the transition zone 23 between the carbonization section 22 and the graphitization section 24, the composite heat insulation unit can effectively isolate the heat transfer between the high-temperature graphitization section 24 and the carbonization section 22 and maintain the temperature stability of the carbonization section 22. Therefore, the system improves the overall thermal efficiency and product quality.

[0043] It should be noted that the structure of carbonization section 22 is similar to that of carbonization furnaces in the prior art, such as... Figure 4As shown, it includes a first furnace body 221, an upper heating rod 222, a lower heating rod 223, a rotating roller 224, and a side sealing box 225. The upper heating rod 222 is installed in the upper part of the inner cavity of the first furnace body 221, and the lower heating rod 223 is installed in the lower part of the inner cavity of the first furnace body 221. The rotating roller 224 is installed in the inner cavity of the first furnace body 221 and is located between the upper heating rod 222 and the lower heating rod 223. The two ends of the rotating roller 224 pass through the side wall of the first furnace body 221 and are rotatably connected to the side wall of the first furnace body 221. During operation, the rotating roller 224 rotates under the drive of an external drive mechanism. The side sealing box 225 is located on both sides of the first furnace body 221 to achieve sealing on both sides of the first furnace body 221.

[0044] The structure of graphitization section 24 is similar to that of graphitization furnaces in the prior art, such as... Figure 5 As shown, it includes a second furnace body 241, an upper graphite rod 242, a lower graphite rod 243, and a support roller 244. The upper graphite rod 242 and the lower graphite rod 243 are respectively installed in the upper and lower parts of the inner cavity of the second furnace body 241, and the support roller 244 is installed in the inner cavity of the second furnace body 241 and located between the upper graphite rod 242 and the lower graphite rod 243.

[0045] In some embodiments, both the feed sealing device 21 and the discharge sealing device 25 adopt an air curtain sealing structure, which includes:

[0046] The sealed housing 91 has slit channels 92 at both ends for carbon paper to pass through;

[0047] The air supply system includes a fan, a gas distribution and pressure stabilizing chamber, and a slit nozzle 93. The slit nozzle 93 is arranged along the length of the slit channel 92, and its air outlet is inclined towards the inside of the furnace (carbonization and graphitization furnace) to form a uniform air curtain covering the entire cross-section of the channel.

[0048] An exhaust system, including an exhaust port 94 disposed at the bottom and / or top of the sealed housing;

[0049] The pressure detection and control system includes a pressure sensor 95 installed inside the sealed housing 91, and a controller (not shown in the figure) that automatically adjusts the air volume of the air supply system or the air valve of the exhaust system based on the feedback signal from the pressure sensor.

[0050] In the above embodiment, the outlet of the slit nozzle 93 is tilted 15-30° towards the graphitization furnace. The pressure P1 inside the sealed box 91 is monitored in real time by the pressure sensor 95. When the pressure P1 is less than the pressure set value, the control system increases the air supply volume of the air supply system and / or decreases the exhaust volume of the exhaust system, so that more gas remains inside the sealed box 91. When the pressure P1 is greater than the pressure set value, the control system decreases the air supply volume of the air supply system and / or increases the exhaust volume of the exhaust system, so that the gas inside the sealed box 91 is discharged from the exhaust port 94, thereby reducing the pressure P1 inside the sealed box 91. The closed-loop control of the control system ensures that the pressure inside the sealed box 91 is stable at the set value, so that the pressure inside the sealed box 91 is always greater than the pressure inside the graphitization furnace and the external atmospheric pressure, thus achieving sealing to the outside (atmosphere) and inside (graphitization furnace).

[0051] In some embodiments, the composite heat insulation unit further includes a first air curtain heat insulation device 74 disposed between the high-temperature reflective layer 71 and the heat insulation layer 72, and a second air curtain heat insulation device 75 disposed between the heat insulation layer 72 and the temperature buffer layer 73. The first air curtain heat insulation device 74 and the second air curtain heat insulation device 75 both include a gas pipe and a nozzle 76 connected to an external protective gas. The nozzle 76 is connected to the gas pipe and is arranged parallel to the carbon paper running direction. The transition zone 23 has a gas extraction port corresponding to the nozzle 76 on one side opposite to the nozzle 76. The gas extraction port is connected to a negative pressure air extraction system. By adjusting the air intake of the nozzle 76 and the air extraction volume of the negative pressure air extraction system, a directional airflow curtain wall parallel to the carbon paper plane is formed on the upper and lower sides of the carbon paper running channel.

[0052] In the above embodiments, by precisely controlling the air intake of the gas pipe and the air extraction of the negative pressure extraction system, a stable directional airflow curtain parallel to the carbon paper plane can be formed on the upper and lower sides of the carbon paper running channel, further isolating the temperature of the carbonization section 22 and the graphitization section 24.

[0053] In some embodiments, the transition zone 23 is further provided with a temperature monitoring system, which includes multiple temperature sensors disposed on the high-temperature reflective layer 71, the heat insulation layer 72, and the temperature buffer layer 73.

[0054] In the above embodiments, by setting multiple temperature sensors on the high-temperature reflective layer 71, the heat insulation layer 72 and the temperature buffer layer 73, the temperature of the transition zone 23 can be directly observed. The directional airflow curtain formed by the first air curtain heat insulation device 74 and the second air curtain heat insulation device 75 can be adjusted according to the temperature of different positions in the transition zone 23 to ensure that the temperatures of the carbonized section 22 and the graphitized section 24 do not affect each other.

[0055] In some embodiments, the transition zone 23 is further provided with a second drafting device 26 for carbon paper re-drafting.

[0056] In the above embodiments, by setting a second stretching device 26 in the transition zone 23 to perform intermediate stretching of the carbon paper, it is ensured that no wrinkles or untimely stretching will occur during the carbonization and graphitization heat treatment of the carbon paper.

[0057] The above provides a detailed description of the continuous integrated heat treatment system for carbon paper in hydrogen fuel cells provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A continuous integrated heat treatment system for carbon paper in hydrogen fuel cells, characterized in that, It includes an unwinding mechanism, a graphitization furnace, a first drawing device, and a cutting device, wherein: The unwinding mechanism is used to unwind the carbon paper to be processed and transport it to the carbonization and graphitization furnace. A carbonization and graphitization furnace includes a feeding sealing device, a carbonization section, a transition zone, a graphitization section, and a discharging sealing device. The feeding sealing device is located at the inlet end of the carbonization section, and the discharging sealing device is located at the outlet end of the graphitization section. The transition zone is located between the carbonization section and the graphitization section, and a composite heat insulation unit is provided in the transition zone to isolate heat transfer between the carbonization section and the graphitization section. The composite heat insulation unit includes a high-temperature reflective layer, a heat insulation layer, and a temperature buffer layer arranged sequentially from the graphitization section to the carbonization section. The first drafting device is located at the outlet end of the carbonization graphitization furnace and is used to draft the carbon paper processed by the carbonization graphitization furnace and transport it to the cutting mechanism. A cutting mechanism, located at the outlet end of the first drafting device, is used to cut carbon paper into specified sizes.

2. The continuous integrated heat treatment system for carbon paper in hydrogen fuel cells according to claim 1, characterized in that, Both the infeed sealing device and the discharge sealing device adopt an air curtain sealing structure, which includes: The sealed enclosure has narrow slits at both ends for carbon paper to pass through. The air supply system includes a fan, a gas distribution and pressure stabilizing chamber, and a slit nozzle. The slit nozzle is arranged along the length of the slit channel, and its outlet is inclined toward the inside of the furnace to form a uniform air curtain covering the entire channel cross section. An exhaust system, including exhaust ports located at the bottom and / or top of the sealed housing; The pressure detection and control system includes a pressure sensor installed inside a sealed enclosure, and a controller that automatically adjusts the air volume of the air supply system or the air valve of the exhaust system based on the feedback signal from the pressure sensor.

3. The continuous integrated heat treatment system for carbon paper in hydrogen fuel cells according to claim 1, characterized in that, The high-temperature reflective layer, the heat insulation layer, and the temperature buffer layer are all provided with through holes that correspond to and match the carbon paper.

4. The continuous integrated heat treatment system for carbon paper in hydrogen fuel cells according to claim 3, characterized in that, The composite insulation unit also includes a first air curtain insulation device disposed between the high-temperature reflective layer and the heat insulation layer, and a second air curtain insulation device disposed between the heat insulation layer and the temperature buffer layer.

5. The continuous integrated heat treatment system for carbon paper in hydrogen fuel cells according to claim 4, characterized in that, Both the first and second air curtain insulation devices include a gas pipe and a nozzle connected to an external protective gas. The nozzle is connected to the gas pipe and is arranged parallel to the carbon paper running direction. A gas extraction port corresponding to the nozzle is provided on the side of the transition zone opposite to the nozzle. The gas extraction port is connected to a negative pressure extraction system. By adjusting the air intake of the nozzle and the air extraction volume of the negative pressure extraction system, a directional airflow curtain parallel to the carbon paper plane is formed on the upper and lower sides of the carbon paper running channel.

6. The continuous integrated heat treatment system for carbon paper in hydrogen fuel cells according to claim 1, characterized in that, The transition zone is also equipped with a temperature monitoring system, which includes multiple temperature sensors installed on the high-temperature reflective layer, the heat insulation layer, and the temperature buffer layer.

7. The continuous integrated heat treatment system for carbon paper in hydrogen fuel cells according to claim 1, characterized in that, The total thickness of the composite insulation unit is 300-800mm, of which the high-temperature reflective layer is 50-150mm thick, the heat insulation layer is 150-400mm thick, and the temperature buffer layer is 100-250mm thick.

8. The continuous integrated heat treatment system for carbon paper in hydrogen fuel cells according to claim 1, characterized in that, The transition zone is also equipped with a second drafting device for the secondary drafting of carbon paper.

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