CN112582625B - Continuous hydrophobic treatment equipment and process for gas diffusion layer of fuel cell - Google Patents
Continuous hydrophobic treatment equipment and process for gas diffusion layer of fuel cell Download PDFInfo
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- CN112582625B CN112582625B CN202011475652.2A CN202011475652A CN112582625B CN 112582625 B CN112582625 B CN 112582625B CN 202011475652 A CN202011475652 A CN 202011475652A CN 112582625 B CN112582625 B CN 112582625B
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a continuous hydrophobic treatment device and a continuous hydrophobic treatment process for a gas diffusion layer of a fuel cell, wherein the device comprises a carbon paper A surface treatment area and a carbon paper B surface treatment area, and the carbon paper is automatically turned over by a turnover mechanism to realize continuous hydrophobic treatment of two surfaces of the carbon paper.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to continuous hydrophobic treatment equipment and process for a gas diffusion layer of a fuel cell.
Background
A pem fuel cell is a power generation device that directly converts chemical energy existing in fuel and oxidant into electric energy, and has the advantages of small system volume, high energy density, cleanness, no pollution, no need of complicated air supply and humidification system, etc., and is gaining attention in the industry. The membrane electrode is a core component and consists of a proton exchange membrane, a catalyst layer and a gas diffusion layer, wherein the gas diffusion layer is an important component of a membrane electrode three-in-one component and is an important channel for transmitting reaction gas and transferring generated water. In the membrane electrode manufacturing process, in order to improve the water management capability of the gas diffusion layer, a hydrophobic carbon paper is usually used as a substrate of the gas diffusion layer, a hydrophobic agent solution, such as a Polytetrafluoroethylene (PTFE) solution, is impregnated to perform hydrophobic treatment, and after the impregnation is completed, the carbon paper is dried and sintered to form a network of the hydrophobic agent in the carbon paper, so that good drainage performance is achieved.
In the prior art, patent CN201911263629.4 discloses a method for preparing a two-layer carbon paper type gas diffusion layer, wherein the process of hydrophobization treatment is as follows: adding deionized water into PTFE aqueous emulsion with the mass fraction of 60% for dilution to obtain PTFE aqueous emulsion with the mass fraction of 20%, putting carbon paper into the PTFE aqueous emulsion for soaking for 20min, and then putting the carbon paper into a tubular furnace with the temperature of 350 ℃ for sintering for 30 min. The method realizes hydrophobic treatment by soaking the carbon paper in PTFE aqueous emulsion, which is also a common process in the field of the existing fuel cell, and the soaking method can ensure sufficient treatment of the surface of the carbon paper, but cannot realize continuous treatment, thereby causing the shortage of a commercial chain.
Disclosure of Invention
The invention aims to provide a continuous hydrophobic treatment process and equipment for a gas diffusion layer of a fuel cell, which can ensure that the surface of carbon paper is fully hydrophobic, realize continuous hydrophobic treatment of batch carbon paper and have higher treatment efficiency.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a continuous hydrophobic treatment device for a gas diffusion layer of a fuel cell, which comprises a conveying mechanism, wherein the device comprises a carbon paper surface A treatment area and a carbon paper surface B treatment area, and the conveying mechanism penetrates through the carbon paper surface A treatment area and the carbon paper surface B treatment area and is used for realizing the integral conveying of carbon paper; a plurality of groups of hydrophobic treatment devices arranged along the conveying direction of the conveying mechanism are arranged in the carbon paper surface A treatment area and the carbon paper surface B treatment area respectively, and each hydrophobic treatment device comprises a spray chamber, a filtrate chamber and a drying chamber, wherein the spray chambers, the filtrate chamber and the drying chamber are sequentially arranged along the conveying direction of the conveying mechanism; and a turnover mechanism communicated with the conveying mechanism in the carbon paper A surface treatment area is arranged at the position of the discharge end of the conveying mechanism in the carbon paper A surface treatment area and used for turning the carbon paper by 180 degrees, and the feed end of the conveying mechanism in the carbon paper B surface treatment area is positioned under the turnover mechanism.
The invention is further provided that the hydrophobic treatment device is provided with three groups, three spray pipes which are parallel to the width direction of the conveying belt in the conveying mechanism are arranged in the spray chamber in each group of hydrophobic treatment device, a plurality of spray openings are arranged in the spray pipes along the length direction of the spray pipes in an array manner, and a sensor for detecting the carbon paper is arranged on each spray pipe.
The invention is further set that a collecting tank is arranged in the hydrophobic treatment device under the spray chamber and the filtrate chamber, the collecting tank is connected with the filter element and the material pump in sequence through water pipes and then is connected with the upper charging barrel, the discharge port of the upper charging barrel is respectively connected with a plurality of spray pipes through branch water pipes, and the branch water pipes are respectively provided with a flow control valve.
The invention is further arranged in that the turnover mechanism comprises a vacuum adsorption plate communicated with the tail end of the conveying mechanism in the carbon paper A surface treatment area, a rotating shaft for driving the vacuum adsorption plate to rotate is arranged in the vacuum adsorption plate, and two ends of the rotating shaft are respectively arranged in the track grooves of the two connecting plates in a sliding and penetrating manner; the turnover mechanism also comprises an air cylinder which drives the rotating shaft to do linear sliding lifting motion along the direction of the connecting plate track groove; the two ends of the rotating shaft are respectively and fixedly provided with a limit stop between the vacuum adsorption plate and the connecting plate, the rotating shaft is positioned at the rotating center of the limit stop, a first dovetail groove and a second dovetail groove are respectively arranged on two sides of the limit stop block, a first fixed shaft which is tangentially abutted against the inclined surface section of the first dovetail groove is fixedly arranged on the connecting plate, u-shaped abdicating grooves are respectively arranged on the connecting plates above the first fixed shaft, sliding shafts which are arranged in the connecting track grooves and can be embedded into the U-shaped abdicating grooves are respectively arranged on the connecting plates, a second fixing shaft which is tangentially abutted against the inner inclined surface section of the second dovetail groove is fixedly arranged on the connecting plate and is positioned right above the U-shaped abdicating groove, when the rotating shaft rises to the inclined plane section of the dovetail groove II and is abutted against the fixed shaft II, the vacuum adsorption plate rotates 180 degrees, the adsorption surface of the vacuum adsorption plate faces upwards and is flush with the conveying mechanism in the carbon paper A surface treatment area.
The invention is further arranged in that the conveying mechanism comprises a conveying belt, and an inclined driving roller is arranged at the bottom of the conveying belt penetrating through the filtrate chamber of the conveying mechanism, so that the width direction of the conveying belt in the filtrate chamber is in an inclined shape with one higher end and one lower end.
The invention is further arranged that the lower end of the conveyor belt of the conveying mechanism is provided with strip-shaped filter holes arrayed along the length direction of the conveyor belt, and the upper end of the conveyor belt of the conveying mechanism is provided with a plurality of micro-pores.
The invention is further arranged that the drying chamber is a tunnel heating furnace, the top of the tunnel heating furnace is provided with a blowing port, and the blowing port is vertical to the conveying mechanism; and an air outlet is formed in the bottom of the tunnel heating furnace.
The invention also provides a continuous hydrophobic treatment process for the gas diffusion layer of the fuel cell, which uses the equipment and comprises the following steps:
s1, preparing PTFE emulsion and storing the PTFE emulsion in each upper charging barrel;
s2, placing the carbon paper in a conveying mechanism of a carbon paper A surface treatment area to realize conveying, enabling the carbon paper to reach a spray chamber, sensing the carbon paper by a sensor, and spraying by three spray pipes in sequence;
s3, after the spraying is finished, conveying the carbon paper into a filtrate chamber, and filtering redundant PTFE emulsion on the surface of the carbon paper;
s4, after the step S3 is completed, the carbon paper is conveyed to a drying chamber to be dried;
s5, the carbon paper is subjected to hydrophobic treatment on the A surface of the carbon paper in the A surface treatment area of the carbon paper sequentially through three groups of hydrophobic treatment devices according to the steps S2-S4;
s6, conveying the carbon paper after the step S5 to a turnover mechanism, and conveying the carbon paper to a conveying mechanism of a B-surface treatment area of the carbon paper after 180-degree turnover is realized;
and S7, repeating the steps S2-S5, and finishing the hydrophobic treatment on the B surface of the carbon paper by sequentially passing the carbon paper through three groups of hydrophobic treatment devices in the B surface treatment area of the carbon paper.
The invention is further set that in the carbon paper A surface treatment area and the carbon paper B surface treatment area, the spraying flow rates in three spraying chambers through which the carbon paper sequentially passes along the conveying direction of the conveying mechanism are respectively 5-8L/min, 3-5L/min and 2-3L/min, and the drying temperatures of the three drying chambers are respectively 130-150 ℃, 100-120 ℃ and 80-100 ℃.
The invention is further arranged that the conveying speed of the conveying mechanism is 0.2-0.5m/s when the carbon paper enters the filtrate chamber.
Compared with the prior art, the invention has the beneficial effects that:
1. the hydrophobic treatment equipment comprises a carbon paper A surface treatment area and a carbon paper B surface treatment area, and the carbon paper is automatically turned over by the turnover mechanism, so that the continuous hydrophobic treatment of the two surfaces of the carbon paper is realized, and meanwhile, a spraying treatment mode is adopted, so that the hydrophobic treatment equipment has the advantage of controllable hydrophobic degree; the three groups of water delivery treatment devices act on the carbon paper, and each group of water delivery treatment devices is internally provided with three spray pipes, so that multi-point gradient water drainage treatment on the carbon paper is realized, the rapid and comprehensive formation of a hydrophobic layer on the surface of the carbon paper is met, the water drainage treatment device in the equipment also comprises a filtrate chamber, the carbon paper which is sprayed is conveyed to the filtrate chamber through a conveying mechanism, a conveying belt in the filtrate chamber is obliquely arranged, the redundant emulsion on the surface of the carbon paper is helped to directly and automatically flow down to be collected in a collecting tank through a strip-shaped filtering hole, and the redundant emulsion is stored in a charging barrel again through a filtering core, a pumping pump and other mechanisms, so that the cyclic use of the emulsion is realized, the continuous spray treatment of mass carbon paper uninterrupted feeding is realized, and the cost is saved;
2. the turnover mechanism in the equipment comprises a vacuum adsorption plate, a rotating shaft and other mechanisms for realizing 180-degree turnover of the vacuum adsorption plate, the adsorption and adsorption cancellation processes of the vacuum adsorption plate on the carbon paper are matched with the turnover of the vacuum adsorption plate, so that the carbon paper can be quickly transferred into a carbon paper B treatment area to realize hydrophobic treatment of a B surface, the turnover mechanism directly adopts an air cylinder as a main driving piece, and then a process of turnover and in-situ recovery can be realized in a return process of ascending and descending of the vacuum adsorption plate through the rotating shaft, a limit stop, a dovetail groove, a U-shaped abdicating groove and other parts, so that the quick transfer function of the carbon paper in the continuous treatment equipment is facilitated, and the turnover mechanism has high-efficiency, convenience and reliability commercial application;
3. the carbon paper is sprayed in a continuous gradient mode through the three spraying chambers, three spraying pipes are also arranged in each spraying chamber, and the emulsion sprayed onto the surface of the carbon paper has the advantages of uniformity, rapidness, comprehensiveness and rapid saturation in a short time.
Drawings
FIG. 1 is a schematic diagram showing the positional relationship among a carbon paper A surface treatment zone, a turnover mechanism and a carbon paper B surface treatment zone of the apparatus of the present invention;
FIG. 2 is a system relationship connection diagram of components in the carbon paper A (B) surface treatment area;
FIG. 3 is a schematic diagram showing the positional relationship among a hydrophobic treatment device at the end of a carbon paper A-side treatment area, a turnover mechanism, a hydrophobic treatment device at the beginning of a carbon paper B-side treatment area, and a system block diagram in the hydrophobic treatment device in the apparatus;
FIG. 4 is a schematic view of a sprinkler structure;
FIG. 5 is a schematic diagram of the construction of the conveyor belt within the filtrate chamber;
FIG. 6 is a schematic view of the structure of a tunnel furnace;
FIG. 7 is a schematic view of the overall structure of the turnover mechanism;
FIG. 8 is an enlarged view of a portion of FIG. 7;
FIG. 9 is a schematic view of the turnover mechanism; the device is also a position relation three-dimensional diagram of a conveyor belt mechanism at the tail end in the carbon paper A surface treatment area, a turnover mechanism and a conveyor belt mechanism at the starting end in the carbon paper B surface treatment area;
fig. 10 is a partial enlarged view of B in fig. 9.
In the figure: 1. a transport mechanism; 1-1, a conveyor belt; 1-2, an inclined driving roller; 1-3, an auxiliary drive roller assembly; 1-4, strip-shaped filter holes; 1-5, micro pores; 1-6, processing and conveying a conveying belt for the surface A of the carbon paper; 1-7, processing and conveying a conveying belt for the B surface of the carbon paper; 2. a turnover mechanism; 2-1, vacuum adsorption plate; 2-2, a rotating shaft; 2-3, connecting plates; 2-3-1, a track groove; 2-3-3, fixing the shaft I; 2-3-4, fixing the shaft II; 2-3-5, U-shaped abdicating grooves; 2-4, a cylinder; 2-5, limit stops; 2-5-1, dovetail groove I; 2-5-2 and a dovetail groove II; 2-5-3, sliding shaft; 2-6, a slope section; 2-7, a support seat; 3. a shower pipe; 3-1, a spraying port; 3-2, a sensor; 4. a flow control valve; 5. a tunnel heating furnace; 5-1, an air blowing port; 5-2 and an air outlet.
Detailed Description
The invention is further illustrated but is not in any way limited by the following specific examples.
Example 1
The utility model provides a continuous hydrophobic treatment facility of fuel cell gas diffusion layer, mainly by carbon paper A face treatment area, carbon paper B face treatment area, the setting realizes that turnover mechanism 2 that is used for the conveying after the carbon paper upset and runs through transport mechanism 1 that realizes the whole conveying of carbon paper all the time constitute between the two, turnover mechanism 2 then sets up at carbon paper A face treatment area conveying exit end department, carbon paper B face treatment area conveying feed end is under turnover mechanism 2 simultaneously, as shown in FIG. 1.
The conveying mechanism 1 comprises a conveying belt 1-1, a servo motor, a frame body and the like, and can be used for placing carbon paper and conveying the carbon paper.
As shown in fig. 2, three sets of hydrophobic treatment devices are respectively arranged in the carbon paper a-side treatment area and the carbon paper B-side treatment area along the conveying direction of the conveying mechanism 1, and each hydrophobic treatment device specifically comprises a spray chamber, a filtrate chamber and a drying chamber, wherein the spray chambers, the filtrate chamber and the drying chamber are sequentially arranged along the conveying direction of the conveying mechanism 1, and the drying chamber is used for filtering redundant spray liquid on the carbon paper.
The spray rooms, as shown in fig. 2, three sets of hydrophobic processing devices are provided with three spray rooms, the conveying mechanism 1 entering the spray rooms realizes horizontal conveying of carbon paper, each spray room is provided with three spray pipes 3 parallel to the width direction of the conveying belt 1-1 in the conveying mechanism 1, 3-6 spray ports 3-1 are arranged in the spray pipes 3 in an array mode along the length direction of the spray pipes, a sensor 3-2 for detecting the carbon paper is arranged on each spray pipe 3, and a distance sensor is used in the embodiment, as shown in fig. 4.
The filtrate chamber, the conveying mechanism 1 in the filtrate chamber includes the inclined driving roller 1-2 set at the bottom of the conveying belt 1-1 of the conveying mechanism 1, the inclined driving roller 1-2 can be matched with the length of the filtrate chamber to set several, the conveying belt 1-1 conveyed therein is in the inclined shape with one higher end and one lower end along the width direction, and the auxiliary driving roller assembly 1-3 pressing the upper surface of the filtrate conveying belt is set on the conveying belt 1-1 of the filtrate chamber near the inclined driving roller 1-2, as shown in fig. 5.
The drying chamber, as shown in fig. 6, is a tunnel heating furnace 5, the blowing ports 5-1 of the tunnel heating furnace 5 are all arranged at the top of the drying chamber and are perpendicular to the conveying mechanism 1, so as to facilitate further limiting of the carbon paper in the drying process of the tunnel heating furnace 5, prevent the carbon paper from being blown away to cause undesirable phenomena such as surface damage, and the like, and meanwhile, the air outlets 5-2 of the tunnel heating furnace 5 are all arranged at the bottom of the drying chamber.
The turnover mechanism 2, as shown in fig. 7-10, the turnover mechanism 2 includes a vacuum adsorption plate 2-1 communicated with the end of the transport mechanism 1 in the carbon paper a-side processing area, and one surface of the vacuum adsorption plate 2-1 is provided with adsorption holes for vacuum adsorption of the carbon paper, that is, the carbon paper is transported by the transport mechanism 1 to the vacuum adsorption plate 2-1 and is pushed by the next carbon paper after reaching the vacuum adsorption plate 2-1, so that the previous carbon paper is completely dropped on the vacuum adsorption plate 2-1, thereby facilitating the vacuum adsorption plate 2-1 to completely adsorb the previous carbon paper.
Meanwhile, a rotating shaft 2-2 for driving the vacuum adsorption plate 2-1 to rotate is arranged in the vacuum adsorption plate 2-1, the rotating shaft 2-2 penetrates through the central position of the vacuum adsorption plate 2-1, the two ends of the rotating shaft 2-2 penetrate through the vacuum adsorption plate 2-1 and then are respectively and rotatably arranged in a bearing seat, the two ends of the rotating shaft 2-2 respectively penetrate through two connecting plates 2-3 vertical to the vacuum adsorption plate 2-1, track grooves 2-3-1 are respectively arranged on the connecting plates 2-3 along the height direction, the two ends of the rotating shaft are respectively and slidably arranged in the track grooves 2-3-1 of the two connecting plates 2-3, the turnover mechanism 2 also comprises two air cylinders 2-4 for driving the rotating shaft 2-2 to do linear sliding and lifting movement along the track grooves 2-3-1 of the connecting plates 2-3, that is, the telescopic rods of the two cylinders 2-4 are respectively and fixedly connected with the bearing seats at the two ends of the rotating shaft 2-2, the telescopic motion of the telescopic rods can drive the vacuum adsorption plate 2-1 to lift, and meanwhile, the two ends of the rotating shaft 2-2 respectively move up and down in the track grooves 2-3-1 of the connecting plate 2-3 in a straight line.
Further, as shown in fig. 8, limit stops 2-5 parallel to the connecting plate 2-3 are fixedly arranged at two ends of the rotating shaft 2-2 between the vacuum adsorption plate 2-1 and the bearing seat, the rotating shaft 2-2 is arranged at the position of the rotation center of the limit stops 2-5, dovetail grooves 2-5-1 and dovetail grooves 2-5-2 are respectively arranged at two sides of the limit stops 2-5, fixing shafts 2-3-3 tangentially abutting against the inclined surface sections 2-6 of the dovetail grooves 2-5-1 are fixedly arranged on the connecting plate 2-3, U-shaped abdicating grooves 2-3-5 are respectively arranged on the connecting plate 2-3 and right above the fixing shafts 2-3-3, and U-shaped abdicating grooves 2-3-1 which can be embedded into the connecting plate 2-3 track grooves 2-3-1 are respectively arranged on the connecting plate 2-3 3-5, a fixed shaft II 2-3-4 which is tangentially abutted with an inner inclined plane section 2-6 of the dovetail groove II 2-5-2 is fixedly arranged on the connecting plate 2-3 and is positioned right above the U-shaped abdicating groove 2-3-5, and when the rotating shaft 2-2 rises until the inclined plane section 2-6 of the dovetail groove II 2-5-2 is abutted with the fixed shaft II 2-3-4, the vacuum adsorption plate 2-1 rotates for 180 degrees; as shown in fig. 7 and 9, the telescopic rod of the cylinder 2-4 is not extended, and at this time, the vacuum adsorption plate 2-1 is also in a non-overturned state, the adsorption surface faces downwards, and the whole is positioned at the lower position of the conveying mechanism 1 in the carbon paper a-surface treatment area.
Specific embodiment of the turnover mechanism 2: after the device is completely started to work, the air cylinder 2-4 is in a working state, so that the telescopic rod gradually extends out, in the process that the telescopic rod gradually extends out, the vacuum adsorption plate 2-1 is driven to ascend, the rotating shaft 2-2 also ascends along the track groove 2-3-1 of the connecting plate 2-3, when the dovetail groove I2-5-1 of the limit stop 2-5 on the rotating shaft 2-2 is abutted to the fixing shaft I2-3-3 on the connecting plate 2-3, the vacuum adsorption plate 2-1 stops ascending, but under the continuous ascending force action of the telescopic rod, the fixing shaft I2-3-3 is abutted to the inclined plane of the dovetail groove I2-5-1 to form a first rotating supporting point for the limit baffle to rotate, and under the decomposition action of force, the inclined plane section 2-6 of the dovetail groove I2-5-1 is abutted to the fixing shaft I2-3- 3 continuously and tangentially abut against and move towards the opening end of the dovetail groove I2-5-1, so as to drive the rotation of the rotating shaft 2-2, and also drive the rotation of the vacuum adsorption plate 2-1, in the continuous rotation process of the rotating shaft 2-2, the sliding shaft 2-2-3 on the limit stop 2-5 slides into the U-shaped abdicating groove 2-3-5 to form a second rotation supporting point for the limit stop 2-5 to continuously rotate, so that the rotating shaft 2-2 continuously rotates, when the rotating shaft 2-2 rotates until the inclined surface section 2-6 of the dovetail groove II 2-5-2 abuts against the fixed shaft II 2-3-4, and the fixed shaft II 2-3-4 is completely clamped in the dovetail groove II 2-5-2, the vacuum adsorption plate 2-1180 degree is turned over, meanwhile, the vacuum adsorption plate 2-1 rises to be flush with the outlet end of the conveying mechanism 1 in the carbon paper A surface treatment area, the carbon paper is conveyed to the vacuum adsorption plate 2-1 by the conveying inertia of the conveying mechanism 1 at the moment, so that the carbon paper is completely adsorbed by the vacuum adsorption plate 2-1, and for the convenience of the overall intelligent control of the turnover mechanism 2, a sensor in signal connection with a circuit of an air cylinder 2-4 can be arranged in the vacuum adsorption plate 2-1, when the sensor senses the carbon paper, the air cylinder 2-4 directly works again, the telescopic rod is controlled to retract, so that the vacuum adsorption plate 2-1 is turned over again and falls down, the carbon paper A surface is enabled to face the feed end of the conveying mechanism 1 in the carbon paper B surface treatment area, then the vacuum adsorption plate 2-1 cancels the adsorption of the carbon paper, and the carbon paper falls on the conveying mechanism 1 in the carbon paper B surface treatment area, thus realizing the hydrophobic treatment of the B surface of the carbon paper in the B surface treatment area of the carbon paper.
As shown in figure 3, a collecting pond is arranged at the inlet of a spray chamber, a filtrate chamber and a drying chamber in a hydrophobic treatment device, a filter element and a material pumping pump are sequentially connected in the collecting pond through water pipes and then are connected with an upper charging barrel, a discharge port of the upper charging barrel is respectively connected with a plurality of spray pipes 3 through branch water pipes, flow control valves 4 are arranged on the branch water pipes, strip-shaped filter holes 1-4 arrayed along the length direction of the strip-shaped filter holes are arranged at the lower end of a conveyor belt 1-1 of a conveying mechanism 1, a plurality of micro-pores 1-5 are arranged at the higher end of the conveyor belt 1-1, carbon paper after being sprayed is conveyed to the filtrate chamber through the conveying mechanism 1, the inclined arrangement of the conveyor belt 1-1 in the filtrate chamber helps redundant emulsion on the surface of the carbon paper to directly and automatically flow down through the strip-shaped filter holes 1-4 to be collected in the collecting pond, and then filter elements are arranged, Mechanisms such as a pumping pump and the like are stored in the charging barrel again, so that the emulsion is recycled, the continuous spraying treatment of mass carbon paper uninterrupted feeding is realized, and the cost is saved.
A hydrophobic treatment process adopting the continuous hydrophobic treatment equipment for the gas diffusion layer of the fuel cell specifically comprises the following steps:
s1, starting the hydrophobic treatment equipment, operating the air cylinder 2-4 in the turnover mechanism 2, and driving the telescopic rod to ascend to the adsorption surface of the vacuum adsorption plate 2-1 to be communicated with the outlet end of the conveying mechanism 1 in the carbon paper A surface treatment area in a flush manner;
s2, preparing PTFE emulsion and storing the PTFE emulsion in each upper charging barrel;
s3, sequentially placing batches of carbon paper in the conveying mechanism 1 of the carbon paper surface A processing area at intervals to realize conveying, enabling the batches of carbon paper to reach a first spraying chamber, sensing the batches of carbon paper by the distance sensors 2-3, and sequentially spraying by the three spraying pipes 3, wherein the spraying flow in the spraying chamber is controlled to be 5-8L/min, and specifically can be 5L/min;
s4, conveying the carbon paper into a filtrate chamber after spraying is finished, filtering off redundant PTFE emulsion on the surface of the carbon paper, controlling the conveying speed of the conveying mechanism 1 to be 0.2-0.5m/S, specifically 0.25m/S, and setting the length of the filtrate chamber to be 2-4m in order to ensure sufficient filtrate;
s5, after the step S4 is completed, the carbon paper is conveyed into a tunnel heating furnace 5 of a drying chamber to be dried, and at the moment, the temperature in the tunnel heating furnace 5 is 130-150 ℃, and specifically can be 130 ℃;
s6, the carbon paper is subjected to hydrophobic treatment on the A surface of the carbon paper in the A surface treatment area of the carbon paper sequentially through three groups of hydrophobic treatment devices according to the steps S3-S5; when the carbon paper is positioned in a second spray chamber in the carbon paper A surface treatment area, the spray flow is 3-5L/min, particularly 3.5L/min, and when the carbon paper enters a second drying chamber, the drying temperature is 100-120 ℃, particularly 120 ℃; when the carbon paper enters a third spray chamber in the carbon paper A surface treatment area, the spray flow is 2-3L/min, specifically 2L/min, and when the carbon paper enters a second drying chamber, the drying temperature is 80-100 ℃, specifically 100 ℃;
s7, conveying the carbon paper after the step S6 to a turnover mechanism 2, turning the carbon paper by 180 degrees, and conveying the carbon paper to a conveying mechanism 1 in a B surface processing area of the carbon paper;
and S8, repeating the steps S3-S6, and finishing the hydrophobic treatment on the B surface of the carbon paper by sequentially passing the carbon paper through three groups of hydrophobic treatment devices in the B surface treatment area of the carbon paper.
It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (9)
1. A continuous hydrophobic treatment apparatus for a gas diffusion layer of a fuel cell, comprising a transport mechanism (1), characterized in that: the equipment comprises a carbon paper surface A processing area and a carbon paper surface B processing area, wherein the conveying mechanism (1) penetrates through the carbon paper surface A processing area and the carbon paper surface B processing area to realize the integral conveying of the carbon paper; a plurality of groups of hydrophobic treatment devices arranged along the conveying direction of the conveying mechanism (1) are arranged in the carbon paper A surface treatment area and the carbon paper B surface treatment area respectively, and each hydrophobic treatment device comprises a spray chamber, a filtrate chamber and a drying chamber, wherein the spray chambers, the filtrate chamber and the drying chamber are sequentially arranged along the conveying direction of the conveying mechanism (1); a turnover mechanism (2) communicated with the conveying mechanism (1) in the carbon paper A surface treatment area is arranged at the discharge end of the conveying mechanism (1) in the carbon paper A surface treatment area and used for turning the carbon paper 180 degrees, and the feed end of the conveying mechanism (1) in the carbon paper B surface treatment area is positioned right below the turnover mechanism (2);
the turnover mechanism (2) comprises a vacuum adsorption plate (2-1) communicated with the tail end of the conveying mechanism (1) in the carbon paper A surface treatment area, a rotating shaft (2-2) for driving the vacuum adsorption plate (2-1) to rotate is installed in the vacuum adsorption plate (2-1), and two ends of the rotating shaft (2-2) are respectively arranged in the track grooves (2-3-1) of the two connecting plates (2-3) in a sliding and penetrating mode; the turnover mechanism (2) also comprises a cylinder (2-4) which drives the rotating shaft (2-2) to do linear sliding lifting motion along the direction of the track groove (2-3-1) of the connecting plate (2-3); the two ends of the rotating shaft (2-2) are positioned between the vacuum adsorption plate (2-1) and the connecting plate (2-3) and are fixedly provided with limit stops (2-5), the rotating shaft (2-2) is positioned at the rotating center of the limit stops (2-5), two sides of each limit stop (2-5) are respectively provided with a dovetail groove I (2-5-1) and a dovetail groove II (2-5-2), the connecting plate (2-3) is fixedly provided with a fixing shaft I (2-3-3) which is tangentially abutted against an inclined plane section (2-6) of the dovetail groove I (2-5-1), the connecting plate (2-3) is provided with a U-shaped abdicating groove (2-3-5) right above the fixing shaft I (2-3-3), sliding shafts (2-5-3) which are positioned in the track grooves (2-3-1) of the connecting plate (2-3) and can be embedded into the U-shaped abdicating grooves (2-3-5) are arranged on the connecting plate (2-3), a second fixed shaft (2-3-4) which is tangentially abutted against the inner inclined plane section (2-6) of the second dovetail groove (2-5-2) is fixedly arranged on the connecting plate (2-3) and is positioned right above the U-shaped abdicating groove (2-3-5), when the rotating shaft (2-2) rises to the position where the inclined surface section (2-6) of the dovetail groove II (2-5-2) is abutted against the fixed shaft II (2-3-4), the vacuum adsorption plate (2-1) rotates for 180 degrees, the adsorption surface of the vacuum adsorption plate (2-1) faces upwards and is flush with the conveying mechanism (1) in the carbon paper A surface treatment area.
2. The continuous hydrophobic processing apparatus for a gas diffusion layer of a fuel cell according to claim 1, wherein: the device is characterized in that the hydrophobic treatment devices are provided with three groups, three spray pipes (3) parallel to the width direction of the conveying belt (1-1) in the conveying mechanism (1) are arranged in spray chambers in each group of hydrophobic treatment devices, a plurality of spray openings (3-1) are formed in the spray pipes (3) along the length direction of the spray pipes, and a sensor (3-2) for detecting carbon paper is arranged on each spray pipe (3).
3. The continuous hydrophobic processing apparatus for a gas diffusion layer of a fuel cell according to claim 2, wherein: the device is characterized in that a collecting tank is arranged under a spray chamber and a filtrate chamber in the hydrophobic treatment device, a water pipe is sequentially connected with a filter element and a material pumping pump in the collecting tank and then connected with an upper material cylinder, a discharge port of the upper material cylinder is respectively connected with a plurality of spray pipes (3) through branch water pipes, and flow control valves (4) are arranged on the branch water pipes.
4. The continuous hydrophobic processing apparatus for a gas diffusion layer of a fuel cell according to claim 1, wherein: the conveying mechanism comprises a conveying belt (1-1), an inclined driving roller (1-2) is arranged at the bottom of the conveying belt (1-1) penetrating through the filtrate chamber, and the conveying belt (1-1) in the filtrate chamber is inclined with one end higher and the other end lower in the width direction.
5. The continuous hydrophobic processing apparatus for a gas diffusion layer of a fuel cell according to claim 4, wherein: the strip-shaped filter holes (1-4) arrayed along the length direction of the conveyor belt are formed in the lower end of the conveyor belt (1-1) of the conveying mechanism (1), and a plurality of micro pores (1-5) are formed in the upper end of the conveyor belt (1-1) of the conveying mechanism (1).
6. The continuous hydrophobic processing apparatus for a gas diffusion layer of a fuel cell according to claim 1, wherein: the drying chamber is a tunnel heating furnace (5), the top of the tunnel heating furnace (5) is provided with a blowing port (5-1), and the blowing port is vertical to the conveying mechanism (1); and an air outlet (5-2) is formed in the bottom of the tunnel heating furnace (5).
7. A continuous hydrophobic treatment process for a gas diffusion layer of a fuel cell, wherein the device of any one of claims 1 to 6 is used, and the treatment process comprises the following steps:
s1, preparing PTFE emulsion and storing the PTFE emulsion in each upper charging barrel;
s2, placing the carbon paper in a conveying mechanism (1) of a carbon paper A surface treatment area to realize conveying, enabling the carbon paper to reach a spray chamber, sensing the carbon paper by a sensor (3-2), and then sequentially spraying by three spray pipes (3);
s3, after the spraying is finished, conveying the carbon paper into a filtrate chamber, and filtering redundant PTFE emulsion on the surface of the carbon paper;
s4, after the step S3 is completed, the carbon paper is conveyed to a drying chamber to be dried;
s5, the carbon paper is subjected to hydrophobic treatment on the A surface of the carbon paper in the A surface treatment area of the carbon paper sequentially through three groups of hydrophobic treatment devices according to the steps S2-S4;
s6, conveying the carbon paper after the step S5 to a turnover mechanism (2), and conveying the carbon paper to a conveying mechanism (1) of a B surface processing area of the carbon paper after 180-degree turnover is realized;
and S7, repeating the steps S2-S5, and finishing the hydrophobic treatment on the B surface of the carbon paper by sequentially passing the carbon paper through three groups of hydrophobic treatment devices in the B surface treatment area of the carbon paper.
8. The continuous hydrophobic treatment process for a gas diffusion layer of a fuel cell according to claim 7, wherein: in the carbon paper A surface treatment area and the carbon paper B surface treatment area, the spraying flow rates in three spraying chambers through which the carbon paper sequentially passes along the conveying direction of the conveying mechanism (1) are respectively 5-8L/min, 3-5L/min and 2-3L/min, and the drying temperatures of the three drying chambers are respectively 130-150 ℃, 100-120 ℃ and 80-100 ℃.
9. The continuous hydrophobic treatment process for a gas diffusion layer of a fuel cell according to claim 8, wherein: when the carbon paper enters the filtrate chamber, the conveying speed of the conveying mechanism (1) is 0.2-0.5 m/s.
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| CN114824310B (en) * | 2022-03-15 | 2023-10-03 | 上海碳际实业集团有限公司 | Equipment and method for continuous hydrophobicity of gas diffusion layer of fuel cell |
| CN114824309B (en) * | 2022-03-15 | 2024-04-12 | 上海碳际实业集团有限公司 | Equipment for continuously preparing gas diffusion layer of fuel cell and preparation method thereof |
| CN114464820B (en) * | 2022-04-08 | 2022-07-12 | 湖南隆深氢能科技有限公司 | Equipment for fuel cell GDL hydrophobic process |
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| TWI398982B (en) * | 2007-08-15 | 2013-06-11 | Univ Feng Chia | Modified carbonized substrate and its manufacturing method and use |
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| CN109930423A (en) * | 2019-04-23 | 2019-06-25 | 无锡先导智能装备股份有限公司 | Carbon paper hydrophobic treatment device and its spray assemblies |
| CN111146450B (en) * | 2019-12-26 | 2020-12-22 | 一汽解放汽车有限公司 | Device and method for continuously preparing gas diffusion layer of fuel cell |
| CN110993996A (en) * | 2019-12-27 | 2020-04-10 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Carbon paper hydrophobic pretreatment system |
| CN111725523A (en) * | 2020-06-04 | 2020-09-29 | 浙江高成绿能科技有限公司 | Thin-layer hydrophobic fuel cell membrane electrode and preparation method thereof |
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