Recycled water circulation subsystem for fuel cell substrate production and fuel cell substrate production system

Abstract

This application relates to the technical field of reclaimed water treatment in the production of fuel cell substrates. Specifically, it relates to a reclaimed water circulation subsystem for fuel cell substrate production and a fuel cell substrate production system, which includes a wet forming section, an under-mesh water tank, a dispersion batching module, a sedimentation and filtration module, as well as a first water supply pipe and a second water supply pipe. The under-mesh water tank is used to receive the water sent out from the wet forming section. Both the dispersion batching module and the sedimentation and filtration module are used to receive the water sent out from the under-mesh water tank. The dispersion batching module is connected to the wet forming section through the first water supply pipe, and the sedimentation and filtration module is connected to the under-mesh water tank through the second water supply pipe to send the filtered water to the under-mesh water tank. The purpose of this application is to provide a reclaimed water circulation subsystem for fuel cell substrate production and a fuel cell substrate production system for at least one technical problem involved in the background technology.

Description

Technical Field

[0001] This application relates to the technical field of recycled water treatment in the production of fuel cell substrates. Specifically, it relates to a recycled water circulation subsystem for fuel cell substrate production and a fuel cell substrate production system. Background Art

[0002] A fuel cell substrate is a special type of paper, and its production process has special requirements, which are somewhat different from traditional wet forming. A large amount of recycled water is generated during the production process of fuel cell substrates. If directly discharged, it will not only cause waste of auxiliary materials but also environmental pollution. In existing recycled water treatment systems, either the introduction of iron ions and aluminum ions makes them inapplicable to the production of fuel cell substrates, or the production cost is relatively high or complete closed-loop circulation cannot be achieved, making it difficult to meet the current production requirements of fuel cell substrates. Summary of the Invention

[0003] The purpose of this application is to provide a recycled water circulation subsystem for fuel cell substrate production and a fuel cell substrate production system for at least one of the technical problems involved in the background art.

[0004] To achieve the above purpose, this application adopts the following technical solutions:

[0005] One aspect of this application provides a recycled water circulation subsystem for fuel cell substrate production, including a wet forming section, an under-screen water tank, a dispersion batching module, a precipitation and filtration module, as well as a first water supply pipe and a second water supply pipe. The under-screen water tank is used to receive the water sent out from the wet forming section. Both the dispersion batching module and the precipitation and filtration module are used to receive the water sent out from the under-screen water tank. The dispersion batching module is connected to the wet forming section through the first water supply pipe, and the precipitation and filtration module is connected to the under-screen water tank through the second water supply pipe to send the filtered water to the under-screen water tank.

[0006] Optionally, the dispersion batching module includes a forming batching unit and a material dispersion unit, as well as a first return pipe, a second return pipe, and a third water supply pipe;

[0007] The forming batching unit is connected to the under-screen water tank through the first return pipe, so that the under-screen water tank sends water to the forming batching unit through the first return pipe;

[0008] The material dispersion unit is connected to the under-screen water tank through the second return pipe, so that the under-screen water tank sends water to the material dispersion unit through the second return pipe;

[0009] The forming batching unit and the material preparation and dispersion unit are connected through a third water supply pipe, so that the material preparation and dispersion unit can send water to the forming batching unit.

[0010] Optionally, the precipitation and filtration module includes a sedimentation tank and a water treatment unit, as well as a third water return pipe, a fourth water supply pipe, and a fifth water supply pipe;

[0011] The sedimentation tank is connected to the lower net water tank through the third water return pipe, so that the lower net water tank can send water to the sedimentation tank through the third water return pipe;

[0012] The water treatment unit is connected to the sedimentation tank through the fourth water supply pipe, so that the sedimentation tank can send water to the water treatment unit through the fourth water supply pipe;

[0013] The water treatment unit is connected to the lower net water tank through the fifth water supply pipe, so that the water treatment unit can send water to the lower net water tank through the fifth water supply pipe.

[0014] Optionally, the precipitation and filtration module further includes a water return tank and a backwash pipe. The water treatment unit is connected to the water return tank through the fourth water supply pipe. The water return tank is connected to the lower net water tank through the fifth water supply pipe. One end of the backwash pipe is connected to the water return tank, and the other end of the backwash pipe is connected to the water treatment unit. In this way, the water with low viscosity sent out from the water treatment unit can be stored in the water return tank. The water in the water return tank flows back to the lower net water tank through the second water return pipe. The water in the water return tank can also be sent to the water treatment unit through the backwash pipe for backwashing, and the backwashed water is then sent back to the water return tank through the second water return pipe.

[0015] Optionally, the precipitation and filtration module further includes a standby pipeline. One end of the standby pipeline is connected to the sedimentation tank, and the other end is connected to the water return tank. The required return water viscosity for the formula of some fuel cell substrates is relatively high. At this time, it is not necessary for the water treatment unit to treat the return water. At this time, the sedimentation tank can directly lead to the water return tank through the standby pipeline to meet the process requirements.

[0016] Optionally, the precipitation and filtration module further includes a spray water pipe. One end of the spray water pipe is connected to the water return tank, and the other end is connected to the wet forming part. This enables the water in the water return tank to be used as the spray water for the wet forming part, and the spray water will be collected into the lower net water tank to participate in the circulation.

[0017] Optionally, the precipitation and filtration module further includes a lubricating water pipe, one end of the lubricating water pipe is connected to the return water tank, and the other end of the lubricating water pipe is connected to the wet forming section. This enables the water in the return water tank to be used as the lubricating water for the wet forming section, and the lubricating water will be collected in the under-mesh water tank to participate in the circulation. The water in the return water tank can also be used as on-site water, and the on-site water will be collected in the production trench and then sent to the sedimentation tank, and will also participate in the closed circulation of the return water.

[0018] Optionally, the return water circulation subsystem for fuel cell substrate production provided by the embodiments of the present application further includes a concentrated water return pipe, and the material preparation and dispersion unit and the water treatment unit are connected through the concentrated water return pipe.

[0019] In this way, the ultrafiltration concentrated water generated by the water treatment unit will be recycled to the material preparation and dispersion unit to reduce the dosage of the dispersant in production.

[0020] Optionally, the return water circulation subsystem for fuel cell substrate production provided by the embodiments of the present application further includes a water replenishing pipeline, and the water replenishing pipeline is communicated with the under-mesh water tank to replenish water into the under-mesh water tank. The water lost due to drying of the fuel cell substrate can be replenished through the water replenishing pipeline.

[0021] Another aspect of the present application provides a fuel cell substrate production system, including the return water circulation subsystem for fuel cell substrate production provided by the embodiments of the present application.

[0022] The technical solution provided by the present application can achieve at least one of the following beneficial effects:

[0023] The return water circulation subsystem for fuel cell substrate production and the fuel cell substrate production system provided by the present application, when in use, form two water flow closed loops. One water flow closed loop is that the under-mesh water tank sends the production return water to the dispersion and batching module to meet the requirements of dispersion water and batching water, and then sends the water to the wet forming section and enters the under-mesh water tank. The other water flow closed loop is that the under-mesh water tank sends the production return water to the precipitation and filtration module to precipitate and filter the return water. The water with low viscosity formed after filtration flows back to the under-mesh water tank for dilution, so that the viscosity of the return water is stabilized within the process range. These two water flow closed loops enable the return water circulation subsystem for fuel cell substrate production to recycle all the remaining return water except for part of the water lost due to drying of the fuel cell substrate, so it will not cause pollution to the external environment due to being discharged to the external environment, and there is no need to introduce iron ions and aluminum ions, etc., enabling this subsystem to be applied to the production of fuel cell substrates.

[0024] The additional technical features and their advantages of the present application will be more clearly described in the following description content, or can be understood through the specific practice of the present application. Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the specific embodiments of the present application, the following will briefly introduce the drawings required for use in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of an implementation manner of the return water circulation subsystem for fuel cell substrate production provided by an embodiment of the present application;

[0027] Figure 2 It is a relationship diagram of the water treatment capacity and the return water viscosity process parameters of an implementation manner of the return water circulation subsystem for fuel cell substrate production provided by an embodiment of the present application.

[0028] Reference numerals:

[0029] 01, wet forming section; 02, under-screen water tank;

[0030] 03, forming batching unit; 04, material preparation and dispersion unit;

[0031] 05, sedimentation tank; 06, water treatment unit;

[0032] 07, return water tank; 08, standby pipeline. Specific embodiments

[0033] The following will clearly and completely describe the technical solutions of the present application in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] As Figure 1 shown, one aspect of the present application provides a circulating water subsystem for fuel cell substrate production, including a wet forming section 01, an under-mesh water tank 02, a dispersion batching module, a precipitation and filtration module, a first water supply pipe, and a second water supply pipe. The under-mesh water tank 02 is used to receive the water sent out from the wet forming section 01. Both the dispersion batching module and the precipitation and filtration module are used to receive the water sent out from the under-mesh water tank 02. The dispersion batching module is connected to the wet forming section 01 through the first water supply pipe, and the precipitation and filtration module is connected to the under-mesh water tank 02 through the second water supply pipe to send the filtered water to the under-mesh water tank 02.

[0037] The circulating water subsystem for fuel cell substrate production and the fuel cell substrate production system provided by the present application, when in use, form two water flow closed loops. One water flow closed loop is that the under-mesh water tank 02 sends the production return water to the dispersion batching module to meet the water requirements for dispersion and batching, then sends the water to the wet forming section 01 and enters the under-mesh water tank 02. The other water flow closed loop is that the under-mesh water tank 02 sends the production return water to the precipitation and filtration module to precipitate and filter the return water. The water with low viscosity formed after filtration flows back to the under-mesh water tank 02 for dilution, so that the viscosity of the return water is stabilized within the process range. These two water flow closed loops enable the circulating water subsystem for fuel cell substrate production to recycle all the remaining return water except for the part of the water lost due to drying of the fuel cell substrate, so it will not cause pollution to the external environment by discharging to the external environment, and there is no need to introduce iron ions, aluminum ions, etc., enabling this subsystem to be applied to the production of fuel cell substrates.

[0038] Optionally, the dispersion batching module includes a forming batching unit 03, a material dispersion unit 04, a first return water pipe, a second return water pipe, and a third water supply pipe;

[0039] The forming batching unit 03 is connected to the under-mesh water tank 02 through the first return water pipe, so that the under-mesh water tank 02 sends water to the forming batching unit 03 through the first return water pipe;

[0040] The material dispersion unit 04 is communicated with the lower net water tank 02 through the second return water pipe, so that the lower net water tank 02 sends water to the material dispersion unit 04 through the second return water pipe;

[0041] The forming batching unit 03 and the material dispersion unit 04 are communicated through a third water supply pipe, so that the material dispersion unit 04 sends water to the forming batching unit 03.

[0042] As Figure 1 shown, the sum of the amount of production return water (E) sent by the lower net water tank 02 to the forming batching unit 03 and the amount of production return water (F) sent to the material dispersion unit 04 only differs from the water dehydration amount (A) of the wet forming section 01 by the evaporation water amount (G) carried away by the fuel cell substrate due to drying. Figure 1 In, "t / h" is a flow unit, indicating "ton / hour", 380 is a specific value of E + F, 0.126 is a specific value of G, 379.874 is a specific value of A, X - Z is a specific value of D, X is a specific value of B, Z is a specific value of H, 38 - Z is a specific value of E, 342 is a specific value of F; "cP.s" is a viscosity unit, and both Y and 1 are specific values of viscosity, and ">Y cP.s" means that the viscosity here is greater than Y cP.s.

[0043] Optionally, the precipitation and filtration module includes a sedimentation tank 05 and a water treatment unit 06, as well as a third return water pipe, a fourth water supply pipe, and a fifth water supply pipe;

[0044] The sedimentation tank 05 is communicated with the lower net water tank 02 through the third return water pipe, so that the lower net water tank 02 sends water to the sedimentation tank 05 through the third return water pipe;

[0045] The water treatment unit 06 is communicated with the sedimentation tank 05 through the fourth water supply pipe, so that the sedimentation tank 05 sends water to the water treatment unit 06 through the fourth water supply pipe;

[0046] The water treatment unit 06 is communicated with the lower net water tank 02 through the fifth water supply pipe, so that the water treatment unit 06 sends water to the lower net water tank 02 through the fifth water supply pipe.

[0047] Optionally, the precipitation and filtration module further includes a return water tank 07 and a backwash pipe. The water treatment unit 06 is connected to the return water tank 07 through the fourth water supply pipe. The return water tank 07 is connected to the under-mesh return water tank 02 through the fifth water supply pipe. One end of the backwash pipe is connected to the return water tank 07, and the other end of the backwash pipe is connected to the water treatment unit 06. In this way, the water with low viscosity sent out from the water treatment unit 06 can be stored in the return water tank 07. The water in the return water tank 07 flows back to the under-mesh return water tank 02 through the second return water pipe. The water in the return water tank 07 can also be sent to the water treatment unit 06 through the backwash pipe for backwashing, and the backwashed water is then sent to the return water tank 07 through the second return water pipe. As Figure 1 shown, the amount of water (B) sent from the under-mesh return water tank 02 to the sedimentation tank 05 is equal to the sum of the amount of water (D) sent from the return water tank 07 to the under-mesh return water tank 02 and the amount of water (H) sent from the water treatment unit 06 to the material preparation and dispersion unit 04. And, the total amount of water (A + G + D) entering the under-mesh return water tank 02 is equal to the total amount of water (E + F + B) sent out from the under-mesh return water tank 02.

[0048] Optionally, the precipitation and filtration module further includes a spare pipeline 08. One end of the spare pipeline 08 is connected to the sedimentation tank 05, and the other end of the spare pipeline 08 is connected to the return water tank 07. For some fuel cell substrate formulations, the required viscosity of the return water is relatively high. At this time, the water treatment unit 06 is not required to treat the return water. At this time, the sedimentation tank 05 can be directly connected to the return water tank 07 through the spare pipeline to meet the process requirements.

[0049] Optionally, the precipitation and filtration module further includes a spray water pipe. One end of the spray water pipe is connected to the return water tank 07, and the other end of the spray water pipe is connected to the wet forming section 01. This enables the water in the return water tank 07 to be used as spray water for the wet forming section 01, and the spray water will be collected into the under-mesh return water tank 02 to participate in the cycle.

[0050] Optionally, the precipitation and filtration module further includes a lubricating water pipe. One end of the lubricating water pipe is connected to the return water tank 07, and the other end of the lubricating water pipe is connected to the wet forming section 01. This enables the water in the return water tank 07 to be used as lubricating water for the wet forming section 01, and the lubricating water will be collected into the under-mesh return water tank 02 to participate in the cycle. The water in the return water tank 07 can also be used as on-site water, and the on-site water will be collected into the production trench and then sent to the sedimentation tank 05, and will also participate in the closed cycle of the return water.

[0051] Optionally, the return water circulation subsystem provided in the embodiment of the present application for fuel cell substrate production further includes a concentrated water return pipe. The material preparation and dispersion unit 04 and the water treatment unit 06 are connected through the concentrated water return pipe.

[0052] In this way, the ultrafiltration concentrate water generated by the water treatment unit 06 will be recycled to the material preparation and dispersion unit 04 to reduce the dosage of the dispersant produced.

[0053] Optionally, the water recycling subsystem for fuel cell substrate production provided by the embodiments of the present application further includes a makeup water pipeline, and the makeup water pipeline is communicated with the lower net water tank 02 to supply water to the lower net water tank 02. The water lost due to drying of the fuel cell substrate can be replenished through the makeup water pipeline.

[0054] Another aspect of the present application provides a fuel cell substrate production system, including the water recycling subsystem for fuel cell substrate production provided by the embodiments of the present application.

[0055] The fuel cell substrate production system provided by the present application adopts the water recycling subsystem for fuel cell substrate production provided by the present application. When in use, two water flow closed loops are formed. One water flow closed loop is that the lower net water tank 02 sends the production return water to the dispersion and batching module to meet the water requirements for dispersion and batching, and then sends the water to the wet forming section 01 and into the lower net water tank 02. The other water flow closed loop is that the lower net water tank 02 sends the production return water to the sedimentation and filtration module to sediment and filter the return water. The water with low viscosity formed after filtration flows back to the lower net water tank 02 for dilution, so that the viscosity of the return water is stabilized within the process range. These two water flow closed loops enable the water recycling subsystem for fuel cell substrate production to recycle all the remaining return water except for part of the water lost due to drying of the fuel cell substrate. Therefore, it will not cause pollution to the external environment due to being discharged to the external environment, and there is no need to introduce iron ions, aluminum ions, etc., enabling this subsystem to be applied to the production of fuel cell substrates.

[0056] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A recycled water circulation subsystem for fuel cell substrate production, characterized in that, It includes a wet forming section, an under-screen water return tank, a dispersion batching module, a precipitation and filtration module, as well as a first water supply pipe and a second water supply pipe. The under-screen water return tank is used to receive the water sent out from the paper machine wire section. Both the dispersion batching module and the precipitation and filtration module are used to receive the water sent out from the under-screen water return tank. The dispersion batching module is communicated with the wet forming section through the first water supply pipe, and the precipitation and filtration module is communicated with the under-screen water return tank through the second water supply pipe to send the filtered water to the under-screen water return tank; The dispersion batching module includes a forming batching unit and a material dispersion unit, as well as a first water return pipe, a second water return pipe and a third water supply pipe; The forming batching unit is communicated with the under-screen water return tank through the first water return pipe, so that the under-screen water return tank sends water to the forming batching unit through the first water return pipe; The material dispersion unit is communicated with the under-screen water return tank through the second water return pipe, so that the under-screen water return tank sends water to the material dispersion unit through the second water return pipe; The forming batching unit and the material dispersion unit are communicated with each other through the third water supply pipe, so that the material dispersion unit sends water to the forming batching unit; The precipitation and filtration module includes a sedimentation tank and a water treatment unit, as well as a third water return pipe, a fourth water supply pipe and a fifth water supply pipe; The sedimentation tank is communicated with the under-screen water return tank through the third water return pipe, so that the under-screen water return tank sends water to the sedimentation tank through the third water return pipe; The water treatment unit is communicated with the sedimentation tank through the fourth water supply pipe, so that the sedimentation tank sends water to the water treatment unit through the fourth water supply pipe; The water treatment unit is communicated with the under-screen water return tank through the fifth water supply pipe, so that the water treatment unit sends water to the under-screen water return tank through the fifth water supply pipe; The precipitation and filtration module further includes a return water tank and a backwashing pipe. The water treatment unit is communicated with the return water tank through the fourth water supply pipe. The return water tank is communicated with the under-screen water return tank through the fifth water supply pipe. One end of the backwashing pipe is communicated with the return water tank, and the other end of the backwashing pipe is communicated with the water treatment unit; Furthermore, the sum of the amount of production return water sent by the under-screen water return tank to the forming batching unit and the amount of production return water sent to the material dispersion unit only differs from the water dehydration amount of the wet forming section by the evaporation water amount carried away due to drying of the fuel cell substrate, and the amount of water sent from the under-screen water return tank to the sedimentation tank is equal to the sum of the amount of water sent from the return water tank to the under-screen water return tank and the amount of water sent from the water treatment unit to the material dispersion unit.

2. The recirculating water subsystem for fuel cell substrate production according to claim 1, characterized in that The precipitation and filtration module further includes a standby pipeline. One end of the standby pipeline is communicated with the sedimentation tank, and the other end of the standby pipeline is communicated with the return water tank.

3. The circulating water recycling subsystem for fuel cell substrate production according to claim 1, characterized in that, The precipitation and filtration module further includes a spray water pipe. One end of the spray water pipe is connected to the return water tank, and the other end of the spray water pipe is connected to the wet forming section.

4. The circulating water recycling subsystem for fuel cell substrate production according to claim 1, wherein The precipitation and filtration module further includes a lubricating water pipe. One end of the lubricating water pipe is connected to the return water tank, and the other end of the lubricating water pipe is connected to the wet forming section.

5. The recycling water subsystem for fuel cell substrate production according to claim 1, characterized in that, It further includes a concentrated water return pipe, and the material preparation and dispersion unit and the water treatment unit are communicated through the concentrated water return pipe.

6. The circulating water recycling subsystem for fuel cell substrate production according to any one of claims 1 to 5, characterized in that, It further includes a makeup water pipeline, and the makeup water pipeline is communicated with the under-screen water sump to replenish water into the under-screen water sump.

7. Fuel cell substrate production system, characterized in that, It includes a circulating water subsystem for fuel cell substrate production according to any one of claims 1 to 6.

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