CN117334942A - Carbon paper hydrophobic equipment for fuel cell gas diffusion layer and preparation method - Google Patents
Carbon paper hydrophobic equipment for fuel cell gas diffusion layer and preparation method Download PDFInfo
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- CN117334942A CN117334942A CN202311429610.9A CN202311429610A CN117334942A CN 117334942 A CN117334942 A CN 117334942A CN 202311429610 A CN202311429610 A CN 202311429610A CN 117334942 A CN117334942 A CN 117334942A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 141
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 140
- 238000002360 preparation method Methods 0.000 title claims abstract description 75
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 64
- 238000009792 diffusion process Methods 0.000 title claims abstract description 34
- 239000000446 fuel Substances 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 114
- 238000007598 dipping method Methods 0.000 claims abstract description 59
- 238000005096 rolling process Methods 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000001035 drying Methods 0.000 claims abstract description 28
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 8
- 210000001503 joint Anatomy 0.000 claims abstract description 4
- 238000005470 impregnation Methods 0.000 claims description 15
- 238000012546 transfer Methods 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000007665 sagging Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 22
- 230000005540 biological transmission Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
- H01M8/0234—Carbonaceous material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8803—Supports for the deposition of the catalytic active composition
- H01M4/8807—Gas diffusion layers
Abstract
The invention relates to a carbon paper hydrophobic device for a gas diffusion layer of a fuel cell and a preparation method thereof. The invention comprises a hydrophobic liquid preparation system, which comprises a water tank and a preparation tank which are connected; deionized water in the water tank can be conveyed into the preparation tank and mixed with the PTFE solution in the preparation tank to obtain a hydrophobic liquid; the dewatering system comprises a carbon paper roller conveying line, an impregnating module and a liquid rolling module which are sequentially connected; the dipping tank is connected with a preparation tank, and the hydrophobic liquid can be conveyed into the dipping tank from the preparation tank; the carbon paper roller conveying line is used for conveying the carbon paper into the impregnating tank so as to impregnate the carbon paper through the impregnating tank; the liquid rolling module is used for extruding redundant hydrophobic liquid from the impregnated carbon paper; and the drying system is in butt joint with the drainage system so as to dry the rolled carbon paper. The invention can realize continuous water repellency of the carbon paper to meet continuous production of the fuel cell and improve the water repellency uniformity of the gas diffusion layer in the preparation process.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to carbon paper hydrophobic equipment for a gas diffusion layer of a fuel cell and a preparation method thereof.
Background
The Gas Diffusion Layer (GDL) is one of the key components of a proton exchange membrane fuel cell (PEM) Membrane Electrode Assembly (MEA), with GDL performance being closely related to membrane electrode performance, which directly affects cell performance. Role of gas diffusion layer in fuel cell: (1) supporting the catalytic layer and stabilizing the electrode structure; (2) providing gas, electron and drainage channels for electrode reaction; (3) transfer reactants (fuel and catalyst); (4) ensuring electrical conductivity between the bipolar plate and the catalytic layer. When the fuel cell generates electricity, the anode generates hydrogen oxidation reaction to generate protons and electrons, the generated electrons reach the cathode through an external circuit, the generated protons are transferred to the cathode through the proton exchange membrane, and the cathode oxygen obtains electrons and reacts with the protons to generate water. The generated water needs to be rapidly discharged through the gas diffusion layer, and if the gas diffusion layer cannot rapidly discharge the water, the generated water can cause flooding of the catalytic layer, so that the further progress of the reaction is affected.
The existing gas diffusion layer preparation methods are two, one is coil stock preparation, the coil stock preparation belongs to large mass production scale, the equipment is large in volume and high in cost, the water-repellent tank and the oven are long enough to meet the product requirements, and one production line is tens of meters long; the other is tablet preparation, which is generally used for preparing laboratory properties through manual batching, manual dipping and manual drying, and has low efficiency and low yield.
Disclosure of Invention
Therefore, the invention provides the carbon paper hydrophobic equipment for the gas diffusion layer of the fuel cell and the preparation method thereof, which can realize continuous hydrophobic of the carbon paper to meet continuous production of the fuel cell, can realize automatic hydrophobic of the carbon paper of the gas diffusion layer, have higher working efficiency, save manpower and improve hydrophobic uniformity of the gas diffusion layer in the preparation process.
In order to solve the above technical problems, the present invention provides a carbon paper hydrophobic device for a gas diffusion layer of a fuel cell, comprising:
the hydrophobic liquid preparation system comprises a water tank and a preparation tank which are connected; deionized water in the water tank can be conveyed into the preparation tank and mixed with the PTFE solution in the preparation tank to obtain a hydrophobic liquid;
the dewatering system comprises a carbon paper roller conveying line, an impregnating module and a liquid rolling module which are sequentially connected; the dipping module comprises a dipping tank, the dipping tank is connected with the preparation tank, and the hydrophobic liquid can be conveyed into the dipping tank from the preparation tank; the carbon paper roller conveying line is used for conveying carbon paper into the impregnating tank so as to impregnate the carbon paper through the impregnating tank; the liquid rolling module is used for extruding redundant hydrophobic liquid from the impregnated carbon paper;
and the drying system is in butt joint with the drainage system so as to dry the rolled carbon paper.
In one embodiment of the present invention, a first magnetic pump and a first mass flowmeter are sequentially connected between the water tank and the preparation tank, and a first diaphragm pump is connected between the preparation tank and the immersion tank.
In one embodiment of the present invention, the preparation tank is a stirred tank, and the preparation tank and the immersion tank are each provided with a linear density detector.
In one embodiment of the present invention, the magnetic pump further comprises a replenishing tank, and a second magnetic pump and a second mass flowmeter are connected between the replenishing tank and the preparation tank.
In one embodiment of the invention, the dipping tank is provided with a waste outlet, the waste outlet is connected with a second diaphragm pump, the dipping tank is provided with a cooling pipeline, a liquid level sensor, a concentration sensor and a filter, and the cooling pipeline is horizontally paved on the inner wall of the dipping tank and is connected to a water chiller; the liquid level sensor and the concentration sensor are both positioned in the middle of the bottom of the dipping tank and connected to an upper computer; the filter is positioned between the preparation tank and the dipping tank and is connected by a pipeline.
In one embodiment of the invention, the carbon paper roller conveying line comprises a conveying roller line, the conveying roller line comprises a single roller conveying area and an upper double roller conveying area and a lower double roller conveying area, the single roller conveying area comprises a plurality of groups of single rollers which are arranged at equal intervals, the upper double roller conveying area and the lower double roller conveying area comprise a plurality of groups of upper double rollers which are arranged at equal intervals, the distance between two adjacent single rollers and two adjacent upper double rollers is smaller than the length of carbon paper, the carbon paper is conveyed to the upper double roller conveying area and the lower double roller conveying area through the single roller conveying area and is clamped and advanced through the upper double rollers and the lower double rollers, and the conveying roller line comprises an inlet section which is inclined to the horizontal plane of the dipping tank by 30-80 degrees downwards along the conveying direction of the inlet section which is parallel to the horizontal plane of the dipping tank and an outlet section which is inclined to the horizontal plane of the dipping tank by 30-80 degrees upwards along the conveying direction of the inlet section.
In one embodiment of the invention, the two lateral sides of the roller conveyor line are provided with the anti-deviation baffle plates, the longitudinal lower part of the roller conveyor line is provided with the guide protection screen plate, and the horizontal plane of the guide protection screen plate is 3-5mm lower than the tangent point of the upper roller and the lower roller, so as to avoid sagging caused by the influence of gravity in the carbon paper conveying process.
In one embodiment of the invention, the liquid rolling module comprises a liquid rolling roller set, a scraper is arranged on one side of a roller surface of the liquid rolling roller set, a liquid receiving box is arranged on the lower side of the liquid rolling roller set, residual solution on the liquid rolling roller set is cleaned by the scraper and flows back into the dipping tank after being collected by the liquid receiving box, the liquid rolling roller set comprises an upper liquid rolling roller and a lower liquid rolling roller which rotate relatively, and the upper liquid rolling roller is connected with an air cylinder to adjust a gap between the upper liquid rolling roller and the lower liquid rolling roller.
In one embodiment of the invention, the drying system comprises a tunnel type drying oven, a stainless steel mesh conveying belt is arranged in the drying oven, a nozzle for blowing air is arranged right above the stainless steel mesh conveying belt, the internal temperature of the drying oven is controlled to be 20-150 ℃, and the drying oven is heated by arranging a stainless steel electric heating pipe and is exhausted by arranging an exhaust fan.
The invention also provides a preparation method of the gas diffusion layer by using the carbon paper hydrophobic equipment of the gas diffusion layer of the fuel cell, which comprises the following steps:
conveying deionized water in a water tank into the preparation tank and mixing the deionized water with PTFE solution in the preparation tank to obtain hydrophobic liquid;
conveying the hydrophobic liquid from the preparation tank into the impregnation tank;
conveying the carbon paper into the impregnating tank through a carbon paper roller conveying line so as to impregnate the carbon paper through the impregnating tank;
the liquid rolling module is used for extruding redundant hydrophobic liquid from the impregnated carbon paper;
the rolled carbon paper is conveyed to a drying system by a carbon paper roller conveying line for drying;
and after the drying is finished, manually taking out the carbon paper and stacking.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the carbon paper hydrophobic equipment for the fuel cell gas diffusion layer and the preparation method, the carbon paper is conveyed by adopting the roller conveying line, the stress of the carbon paper is uniform, the carbon paper enters and leaves the gum dipping tank at a certain angle, the contact area with the surface of liquid is small, the surface pressure of the liquid in the gum dipping tank facing the carbon paper horizontally is reduced, the hydrophobic time of the carbon paper is ensured by only reserving the hydrophobic tank, the conveying speed can be accelerated by the roller line, and the production efficiency is improved. The traditional sheet carbon paper is cut into pieces firstly, then one piece of the sheet carbon paper is put into the dipping tank manually or by means of a tool, so that the efficiency is low on one hand, and the carbon fibers contained in the carbon paper are not uniformly stressed and are easily damaged on the other hand.
The anti-deviation baffle plates on the two sides of the roller on the roller line of the equipment can prevent the carbon paper from deviating in the transverse direction in the transmission process, and the protection screen plate in the longitudinal direction is 3-5mm lower than the tangent point of the upper roller and the lower roller, so that the carbon paper is prevented from sagging due to the influence of gravity in the transmission process, and firstly, the carbon paper is prevented from falling down, and secondly, the guiding effect is achieved, so that the carbon paper smoothly enters the next group of rollers.
The liquid rolling roller of the equipment adopts a steel roller to steel roller, and the hydrophobic capacity of the carbon paper is ensured to be uniform and stable by adjusting the clamping force between the two liquid rolling rollers. Therefore, as long as the clamping force between the two rollers is adjusted, the hydrophobic loading of the whole batch of carbon paper is uniform; the scraping knife is arranged on the liquid rolling roller to clean the liquid rolling roller regularly, so that a liquid receiving box pipeline below the liquid rolling roller is connected to the dipping tank, redundant solution rolled out by the steel roller flows back to the dipping tank after being collected by the liquid receiving box, the recycling effect is realized, and the waste is avoided.
The oven of the equipment adopts an integral tunnel type design, is a main transmission type oven, adopts a stainless steel net to transmit carbon paper for drying, and has the advantages that the drying time can be adjusted according to the transmission speed of a transmission line, and the single-piece blowing is easier to uniformly dry; meanwhile, an upper air knife and a lower air knife are arranged at the inlet and the outlet of the oven area and are positioned right above and right below the carbon paper, so that the upper surface and the lower surface of the carbon paper can be accurately purged, and redundant carbon powder, impurity particles and the like on the surface of the carbon paper can be removed;
the equipment can realize automatic water drainage of the gas diffusion layer carbon paper, has higher working efficiency, saves manpower, and can improve the water drainage uniformity of the gas diffusion layer in the preparation process.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
FIG. 1 is a schematic diagram of the overall structure of a carbon paper hydrophobic device for a gas diffusion layer of a fuel cell according to the present invention.
FIG. 2 is a schematic diagram of a system for preparing a hydrophobic liquid according to the present invention.
FIG. 3 is a schematic diagram of the structure of the hydrophobic system of the present invention.
FIG. 4 is a schematic diagram of a conveyor line for a carbonroller tube according to the present invention.
Fig. 5 is a schematic side view of the transfer line of the carbonroller tube according to the present invention.
Fig. 6 is a schematic view of the structure of the rolling module of the present invention.
Fig. 7 is a schematic diagram of a drying system according to the present invention.
Description of the specification reference numerals:
00. a fuel cell gas diffusion layer carbon paper hydrophobic device;
10. a hydrophobic liquid preparation system; 11. a water tank; 12. a first magnetic pump; 13. a first mass flow meter; 14. a first diaphragm pump; 15. a linear density detector; 16. a replenishing tank; 17. a second magnetic pump; 18. a second mass flow meter; 19. a second diaphragm pump;
20. a hydrophobic system; 21. preparing a tank; 22. a carbon paper roller conveying line; 22-1, a conveying roller line; 22-2, guiding the protective screen plate; 22-3, a deflection preventing baffle; 23. an impregnation module; 23-1, an immersion tank; 23-2, a dipping tank cover; 24. a liquid rolling module; 24-1, upper mangle rolls; 24-2, lower mangle rolls; 24-3, scraping knife; 24-4, an air cylinder;
30. a drying system; 31. a tuyere; 32. an exhaust fan; 33. an electric heating tube; 34. stainless steel mesh conveyor belt.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
In the present invention, if directions (up, down, left, right, front and rear) are described, they are merely for convenience of description of the technical solution of the present invention, and do not indicate or imply that the technical features must be in a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, "a plurality of" means one or more, and "a plurality of" means two or more, and "greater than", "less than", "exceeding", etc. are understood to not include the present number; "above", "below", "within" and the like are understood to include this number. In the description of the present invention, the description of "first" and "second" if any is used solely for the purpose of distinguishing between technical features and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present invention, unless clearly defined otherwise, terms such as "disposed," "mounted," "connected," and the like should be construed broadly and may be connected directly or indirectly through an intermediate medium, for example; the connecting device can be fixedly connected, detachably connected and integrally formed; can be mechanically connected, electrically connected or capable of communicating with each other; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the invention can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1, a fuel cell gas diffusion layer carbon paper hydrophobic device 00 of the present invention includes:
a hydrophobic liquid preparation system 10 comprising a water tank 11 and a preparation tank 21 connected; deionized water in the water tank 11 can be fed into the preparation tank 21 and mixed with PTFE solution in the preparation tank 21 to obtain a hydrophobic liquid;
the dewatering system 20 comprises a carbon paper roller conveying line 22, a dipping module 23 and a liquid rolling module 24 which are connected in sequence; the dipping module 23 comprises a dipping tank 23-1 and a dipping tank cover 23-2, the dipping tank 23-1 is connected with the preparation tank 21, and the hydrophobic liquid can be conveyed into the dipping tank 23-1 from the preparation tank 21; the carbon paper roller conveying line 22 is used for conveying carbon paper into the impregnating tank 23-1 so as to impregnate the carbon paper through the impregnating tank 23-1; the padding module 24 is used for extruding redundant hydrophobic liquid from the impregnated carbon paper;
and a drying system 30, which is in butt joint with the drainage system 20 to dry the rolled carbon paper.
In some embodiments, referring to fig. 2, a first magnetic pump 12 and a first mass flowmeter 13 are sequentially connected between the water tank 11 and the preparation tank 21, and a first diaphragm pump 14 is connected between the preparation tank 21 and the dipping tank 23-1; the preparation tank 21 is a stirring tank, and the preparation tank 21 and the soaking tank 23-1 are both provided with a linear density detector 15; and a second magnetic pump 17 and a second mass flowmeter 18 are connected between the replenishing tank 16 and the preparation tank 21.
In some embodiments, referring to fig. 3, the dipping tank 23-1 is provided with a waste outlet, and the waste outlet is connected with a second diaphragm pump 19, the dipping tank 23-1 is provided with a cooling pipeline, a liquid level sensor, a concentration sensor and a filter, and the cooling pipeline is tiled on the inner wall of the dipping tank 23-1 and connected to a water chiller; the liquid level sensor and the concentration sensor are both positioned in the middle of the bottom of the dipping tank 23-1 and connected to an upper computer; the filter is located between the preparation tank 21 and the dipping tank 23-1 and is connected by a pipeline.
With the above arrangement, deionized water is calculated and fed to the preparation tank 21 by the first magnetic pump 12 and the first mass flow meter 13, the ptfe solution is added to the preparation tank 21 by manual addition, the preparation tank 21 has a slow stirring function, the solutions are mixed, and the solution density is detected by the first in-line density detector 15. After the preparation of the hydrophobic liquid, the liquid is pumped into the impregnating vessel 23-1 by the first diaphragm pump 14 to impregnate the carbon paper. The dipping tank 23-1 is provided with a linear density detector 15, and when the density is reduced, a high-concentration hydrophobic solution is pumped into the dipping tank 23-1 from the replenishing tank 16 to adjust the density, the solution in the dipping tank 23-1 can be filtered through a pipeline, and the liquid is circulated to the preparation tank 21. When the system needs to be cleaned, the liquid in the dipping tank 23-1 is discharged through the liquid outlet, the dewatering tank 11 is filled with deionized water, the deionized water is flushed into the preparation tank 21, the supplementing tank 16 and the dipping tank 23-1 through the cleaning pipeline, and finally the liquid in the dipping tank 23-1 is discharged to complete automatic cleaning.
In some embodiments, referring to fig. 4, the carbon roller conveying line 22 includes a conveying roller line 22-1, the roller conveying line includes a single roller conveying area and an upper and lower double roller conveying area, the single roller conveying area includes a plurality of groups of single rollers arranged at equal intervals, the upper and lower double roller conveying area includes a plurality of groups of upper and lower double rollers arranged at equal intervals, the distance between two adjacent single rollers and two adjacent upper and lower double rollers is smaller than the length of carbon paper, and the carbon paper is conveyed to the upper and lower double roller conveying area through the single roller conveying area and is clamped and advanced through the upper and lower double rollers. The roller conveyor line is angled when immersed in the hydrophobic liquid and angled when immersed out, and has the advantage that the carbon paper can bear smaller water pressure to avoid damage caused by the liquid pressure when entering and exiting the immersion tank 23-1. The conveying roller line 22-1 includes an inlet section inclined downward by 30-80 ° to the horizontal plane of the dipping tank 23-1 in the conveying direction thereof, a dipping section parallel to the horizontal plane of the dipping tank 23-1, and an outlet section inclined upward by 30-80 ° to the horizontal plane of the dipping tank 23-1 in the conveying direction thereof.
Through the arrangement, the carbon paper is manually placed on the single roller, the single roller conveying area conveys the carbon paper to the double roller area, the upper and lower double rollers clamp the carbon paper, so that the carbon paper can stably advance, the carbon paper can be controlled in the solution, one piece of carbon paper is clamped by at least two groups of upper and lower double rollers at the same time, the upper and lower double rollers are driving wheels, and in the process of clamping and conveying the carbon paper, the gaps of the carbon paper are extruded, so that the solution fully permeates into the carbon paper; the rubber roller with integrally customized rollers is adopted, solution cannot enter the rollers to influence the rotation of the rollers, and the rollers are convenient to detach and clean integrally.
In some embodiments, referring to fig. 5, two lateral sides of the roller conveyor line are provided with anti-deviation baffles 22-3, and the anti-deviation baffles 22-3 on two sides of the roller can adjust the width according to the size of the carbon paper to prevent the carbon paper from deviating in the lateral direction in the conveying process; the guiding protection screen plate 22-2 is arranged below the longitudinal direction, the protection screen plate in the longitudinal direction has the functions of preventing the carbon paper from falling down, guiding the carbon paper, ensuring that the carbon paper moves in a preset direction, and ensuring that the carbon paper is not damaged due to too high water pressure when the carbon paper is immersed into the dipping tank 23-1; the horizontal plane of the guide protection screen plate 22-2 is 3-5mm lower than the tangent point of the upper roller and the lower roller, so that the sagging caused by the influence of gravity in the carbon paper conveying process is avoided, and the next group of rollers cannot be entered.
Adopt roller transfer chain transmission carbon paper, the carbon paper atress is even to carbon paper is according to certain angle entering and leaving the gum dipping tank, and is little with liquid surface area of contact, has reduced the surface pressure of liquid level face carbon paper in the gum dipping tank, as long as reserve the hydrophobic groove enough length, guarantees the hydrophobic time of carbon paper, and the roller line can accelerate conveying speed, improves production efficiency.
In some embodiments, referring to fig. 6, the liquid rolling module 24 includes a liquid rolling roller set, a scraper 24-3 is disposed on one side of a roller surface of the liquid rolling roller set, a liquid receiving box is disposed on the lower side of the liquid rolling roller set, residual solution on the liquid rolling roller set is cleaned by the scraper 24-3 and flows back into the dipping tank 23-1 after being collected by the liquid receiving box, the liquid rolling roller set includes an upper liquid rolling roller 24-1 and a lower liquid rolling roller 24-2 which rotate relatively, and the upper liquid rolling roller 24-1 is connected with a cylinder 24-4 to adjust a gap between the upper liquid rolling roller 24-1 and the lower liquid rolling roller 24-2. The hydrophobic capacity of the carbon paper can be more uniform and stable only by uniform pressure between the two roll surfaces, so that the machining precision of the liquid rolling steel roll is ensured, the air cylinder 24-4 is connected with a precise electric proportional valve, the pressure range of the air cylinder 24-4 is 0-1MPa, and the precision of the precise electric proportional valve is 0.05-0.5%. The runout precision of the upper and lower liquid rolling rollers 24-2 is 0.05-1 mu m.
The upper liquid rolling roller 24-1 and the lower liquid rolling roller 24-2 are chrome plating steel rollers, carbon paper is conveyed by a roller conveying line, residual solution on the two steel rollers clamping the carbon paper and extruding redundant hydrophobic liquid rolling rollers is provided with a scraper 24-3 to clean the roller surface; the liquid rolling roller is cleaned regularly by the scraper 24-3, so that the redundant solution rolled by the liquid rolling roller is collected by the liquid receiving box and then flows back to the dipping tank 23-1, the recycling effect is realized, and the waste is avoided; the uniform and stable hydrophobic loading of the carbon paper is ensured by adjusting the clamping force between the two liquid rollers. Thus, the hydrophobic loading of the entire batch of carbon paper is uniform as long as the clamping force between the two rolls is adjusted.
In some embodiments, referring to fig. 7, the drying system 30 includes a tunnel oven, and an openable side door is designed on the operation side to facilitate adjusting the product status; the inside stainless steel mesh conveyer belt 34 that is provided with of oven, the stainless steel mesh is carried and is arranged the nozzle that is used for blowing the air over, and the mode of blowing is top-down, adopts top-down's mode of blowing to be favorable to accelerating the drying rate of hydrophobic liquid bottom, the inside temperature control range of oven is 20-150 ℃, and every section oven is independent accuse temperature, the oven heats through setting up stainless steel electric heating pipe 33 and carries out the exhaust through setting up the exhaust fan, and the amount of wind of airing exhaust frequency conversion is adjustable.
The oven of the equipment adopts an integral tunnel type design, is a main transmission type oven, adopts a stainless steel net to transmit carbon paper for drying, and has the advantages that the drying time can be adjusted according to the transmission speed of a transmission line, and the single-piece blowing is easier to uniformly dry; meanwhile, the upper air knife and the lower air knife are arranged at the inlet and the outlet of the baking oven area and are positioned right above and right below the carbon paper, so that the upper surface and the lower surface of the carbon paper can be accurately purged, and redundant carbon powder, impurity particles and the like on the surface of the carbon paper can be conveniently removed.
Through the arrangement, after the hydrophobic liquid is prepared by the hydrophobic liquid preparation system 10, the hydrophobic liquid is pumped into the dipping tank 23-1 through the first diaphragm pump 14, the carbon paper is manually placed at the feeding position, the carbon paper is conveyed into the dipping tank 23-1 by the roller conveying line for hydrophobic treatment, the soaking time is determined by the conveying speed and the length of the dipping tank 23-1, the carbon paper enters the oven conveying line after the hydrophobic treatment is finished through the liquid rolling roller, the carbon paper is dried in a top-down blowing mode, the carbon paper is discharged out of the oven and is received, and the whole cycle is finished.
The invention also provides a preparation method of the gas diffusion layer by using the carbon paper hydrophobic equipment of the gas diffusion layer of the fuel cell, which comprises the following steps:
the prepared additives, PTFE emulsion, etc. are added to the preparation tank 21;
delivering deionized water in the water tank 11 into the preparation tank 21 and mixing with the PTFE solution in the preparation tank 21 to obtain a hydrophobic liquid;
the hydrophobic liquid is conveyed into the dipping tank 23-1 from the preparation tank 21, and after reaching a set liquid level, an internal circulation pipeline of the dipping tank 23-1 is started;
manually placing the carbon paper of the sheet material on the carbon paper feeding position of the impregnating tank 23-1; the carbon paper is conveyed to the water tank water drain level of the dipping tank 23-1 through a carbon paper roller conveying line 22 to carry out water drain treatment on the carbon paper;
the padding module 24 is used for extruding redundant hydrophobic liquid on the surface of the impregnated carbon paper;
the rolled carbon paper is conveyed to a drying system 30 by a carbon paper roller conveying line 22 for drying;
and after the drying is finished, manually taking out the carbon paper and stacking.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (10)
1. A fuel cell gas diffusion layer carbon paper hydrophobic device, comprising:
a hydrophobic liquid preparation system (10) comprising a water tank (11) and a preparation tank (21) which are connected; deionized water in the water tank (11) can be conveyed into the preparation tank (21) and mixed with PTFE solution in the preparation tank (21) to obtain hydrophobic liquid;
the dewatering system (20) comprises a carbon paper roller conveying line (22), an impregnating module (23) and a liquid rolling module (24) which are connected in sequence; the impregnation module (23) comprises an impregnation tank (23-1), the impregnation tank (23-1) is connected with the preparation tank (21), and the hydrophobic liquid can be conveyed into the impregnation tank (23-1) from the preparation tank (21); the carbon paper roller conveying line (22) is used for conveying carbon paper into the impregnating tank (23-1) so as to impregnate the carbon paper through the impregnating tank (23-1); the padding module (24) is used for extruding redundant hydrophobic liquid from the impregnated carbon paper;
and the drying system (30) is in butt joint with the water draining system (20) so as to dry the rolled carbon paper.
2. The carbon paper dewatering equipment for the gas diffusion layer of the fuel cell according to claim 1, wherein a first magnetic pump (12) and a first mass flowmeter (13) are sequentially connected between the water tank (11) and the preparation tank (21), and a first diaphragm pump (14) is connected between the preparation tank (21) and the dipping tank (23-1).
3. A fuel cell gas diffusion layer carbon paper drainage apparatus according to claim 1, characterized in that the preparation tank (21) is a stirred tank, and the preparation tank (21) and the impregnation tank (23-1) are each equipped with a linear density detector (15).
4. A fuel cell gas diffusion layer carbon paper dewatering device according to claim 1 or 3, characterized by further comprising a supplementary tank (16), a second magnetic pump (17) and a second mass flow meter (18) being connected between the supplementary tank (16) and the preparation tank (21).
5. A fuel cell gas diffusion layer carbon paper drainage apparatus according to claim 1, characterized in that the impregnation tank (23-1) has a waste outlet and the waste outlet is connected with a second diaphragm pump (19), the impregnation tank (23-1) is provided with a cooling pipe, a liquid level sensor, a concentration sensor, a filter, the cooling pipe is laid on the inner wall of the impregnation tank (23-1) and connected to a water chiller; the liquid level sensor and the concentration sensor are both positioned in the middle of the bottom of the dipping tank (23-1) and connected to an upper computer; the filter is positioned between the preparation tank (21) and the dipping tank (23-1) and is connected by a pipeline.
6. A fuel cell gas diffusion layer carbon paper drainage apparatus according to claim 1, characterized in that the carbon paper roll transfer line (22) comprises a transfer roll line (22-1) comprising a single roll transfer zone and an upper and a lower double roll transfer zone, the single roll transfer zone comprising a plurality of sets of equally spaced single rolls, the upper and lower double roll transfer zone comprising a plurality of sets of equally spaced upper and lower double rolls, the distance between adjacent two single rolls, adjacent two upper and lower double rolls being smaller than the length of carbon paper, the carbon paper being transferred through the single roll transfer zone to the upper and lower double roll transfer zone and being advanced by the upper and lower double roll nip, the transfer roll line (22-1) comprising an inlet section inclined in its transfer direction at 30-80 ° down from the level of the impregnation tank (23-1), an impregnation section parallel to the level of the impregnation tank (23-1) and an outlet section inclined in its transfer direction at 30-80 ° up from the level of the impregnation tank (23-1).
7. The carbon paper dewatering equipment for the gas diffusion layer of the fuel cell according to claim 6, wherein the two lateral sides of the roller conveying line are provided with anti-deviation baffles (22-3), the guide protection screen plate (22-2) is arranged below the roller conveying line in the longitudinal direction, and the horizontal plane of the guide protection screen plate (22-2) is lower than 3-5mm of the tangent point of the upper roller and the lower roller so as to avoid sagging caused by gravity in the conveying process of the carbon paper.
8. The carbon paper dewatering equipment for a gas diffusion layer of a fuel cell according to claim 1, wherein the liquid rolling module (24) comprises a liquid rolling roller set, a scraper (24-3) is arranged on one side of a roller surface of the liquid rolling roller set, a liquid receiving box is arranged on the lower side of the liquid rolling roller set, residual solution on the liquid rolling roller set is cleaned by the scraper (24-3) and flows back into the dipping tank (23-1) after being collected by the liquid receiving box, the liquid rolling roller set comprises an upper liquid rolling roller (24-1) and a lower liquid rolling roller (24-2) which rotate relatively, and the upper liquid rolling roller (24-1) is connected with a cylinder (24-4) to adjust a gap between the upper liquid rolling roller (24-1) and the lower liquid rolling roller (24-2).
9. The fuel cell gas diffusion layer carbon paper dewatering equipment according to claim 1, wherein the drying system (30) comprises a tunnel type oven, a stainless steel mesh conveying belt (34) is arranged in the oven, a nozzle for blowing air is arranged right above the stainless steel mesh conveying belt, the internal temperature control range of the oven is 20-150 ℃, and the oven is heated by arranging a stainless steel electric heating pipe (33) and is exhausted by arranging an exhaust fan.
10. A method of producing a gas diffusion layer using the apparatus according to any one of claims 1 to 9, comprising:
delivering deionized water in a water tank (11) into the preparation tank (21) and mixing the deionized water with PTFE solution in the preparation tank (21) to obtain a hydrophobic liquid;
-transferring the hydrophobic liquid from the preparation tank (21) into the impregnation tank (23-1);
conveying the carbon paper into the impregnating tank (23-1) through a carbon paper roller conveying line (22) so as to impregnate the carbon paper through the impregnating tank (23-1);
the padding module (24) is used for extruding redundant hydrophobic liquid from the impregnated carbon paper;
the rolled carbon paper is conveyed to a drying system (30) for drying by a carbon paper roller conveying line (22);
and after the drying is finished, manually taking out the carbon paper and stacking.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311429610.9A CN117334942A (en) | 2023-10-31 | 2023-10-31 | Carbon paper hydrophobic equipment for fuel cell gas diffusion layer and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117594812A (en) * | 2024-01-19 | 2024-02-23 | 山东华滋自动化技术股份有限公司 | Membrane electrode catalyst waste recovery device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117594812A (en) * | 2024-01-19 | 2024-02-23 | 山东华滋自动化技术股份有限公司 | Membrane electrode catalyst waste recovery device |
| CN117594812B (en) * | 2024-01-19 | 2024-03-29 | 山东华滋自动化技术股份有限公司 | Membrane electrode catalyst waste recovery device |
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