Backwater circulation subsystem for fuel cell base material production and fuel cell base material production system

Abstract

The invention relates to the technical field of fuel cell base material production backwater treatment, in particular to a backwater circulation subsystem for fuel cell base material production and a fuel cell base material production system. The backwater circulation subsystem comprises a wet forming part, an under-net backwater pool, a dispersing and batching module, a precipitation and filtration module, a first water supply pipe and a second water supply pipe, the under-net water return pool is used for receiving water sent out from the wet-process forming part, the dispersing and batching module and the precipitation filtering module are both used for receiving water sent out from the under-net water return pool, and the dispersing and batching module is communicated with the wet-process forming part through the first water supply pipe; and the precipitation filtering module is communicated with the under-net water return pool through the second water supply pipe so as to supply the filtered water to the under-net water return pool. The invention aims to provide a backwater circulation subsystem for fuel cell base material production and a fuel cell base material production system aiming at at least one technical problem related in the background technology.

Description

Technical Field

[0001] The present application relates to the technical field of return water treatment in fuel cell substrate production, and more specifically, to a return water circulation subsystem for fuel cell substrate production and a fuel cell substrate production system. Background Art

[0002] Fuel cell substrate is a special paper with special production process requirements, which is somewhat different from traditional wet forming. A large amount of backwater will be generated in the production process of fuel cell substrate. If it is directly discharged, it will not only waste auxiliary materials but also cause environmental pollution. The existing backwater treatment system is either not suitable for the production of fuel cell substrate due to the introduction of iron ions and aluminum ions, or the production cost is high or it cannot achieve a completely closed cycle, which makes it difficult to meet the current production needs of fuel cell substrate. Summary of the invention

[0003] The purpose of the present application is to provide a water return circulation subsystem for fuel cell substrate production and a fuel cell substrate production system in response to at least one technical problem involved in the background technology.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] One aspect of the present application provides a water return circulation subsystem for the production of fuel cell substrates, including a wet forming section, an under-net water return pool, a dispersion and proportioning module and a sedimentation and filtration module, as well as a first water supply pipe and a second water supply pipe. The under-net water return pool is used to receive water sent from the wet forming section, and the dispersion and proportioning module and the sedimentation and filtration module are both used to receive water sent from the under-net water return pool. The dispersion and proportioning 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-net water return pool through the second water supply pipe to send filtered water to the under-net water return pool.

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

[0007] The molding batching unit is connected with the under-net return water pool through the first return water pipe, so that the under-net return water pool sends water to the molding batching unit through the first return water pipe;

[0008] The material preparation and dispersion unit is connected with the under-net return water pool through the second return water pipe, so that the under-net return water pool sends water to the material preparation and dispersion unit through the second return water pipe;

[0009] The molding batching unit is connected to the material preparation and dispersion unit through a third water delivery pipe, so that the material preparation and dispersion unit delivers water to the molding batching unit.

[0010] Optionally, the sedimentation 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 with the under-net return water tank through the third return water pipe, so that the under-net return water tank sends water to the sedimentation tank through the third return water pipe;

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

[0013] The water treatment unit is connected to the under-net water return tank through the fifth water delivery pipe, so that the water treatment unit delivers water to the under-net water return tank through the fifth water delivery pipe.

[0014] Optionally, the sedimentation and filtration module further includes a fifth water supply pipe, a return water tank and a backwash pipe, the water treatment unit is connected to the return water tank through the fourth water supply pipe, the return water tank is connected to the under-net return water pool through the fifth water supply pipe, one end of the backwash pipe is connected to the return water tank, and the other end of the backwash pipe is connected to the water treatment unit. In this way, the low-viscosity water sent from the water treatment unit can be stored in the return water tank, the water in the return water tank flows back to the under-net return water pool through the second return water pipe, the water in the return water tank can also be sent to the water treatment unit through the backwash pipe for backwashing, and the water after backwashing is sent to the return water tank through the second return water pipe.

[0015] Optionally, the sedimentation and filtration module further includes a spare pipeline, one end of which is connected to the sedimentation tank, and the other end of which is connected to the return water tank. Some fuel cell substrates require a relatively high return water viscosity, and in this case, the return water does not need to be treated by the water treatment unit. In this case, the sedimentation tank can be directly connected to the return water tank via the spare pipeline to meet the process requirements.

[0016] Optionally, the sedimentation and filtration module further comprises a spray water pipe, one end of which is connected to the return water tank, and the other end of which is connected to the wet forming part. This allows the water in the return water tank to be used as spray water for the wet forming part, and the spray water will be collected in the return water pool under the net for circulation.

[0017] Optionally, the sedimentation and filtration module further comprises a lubricating water pipe, one end of which is connected to the return water tank, and the other end of which is connected to the wet forming section. This allows the water in the return water tank to be used as lubricating water for the wet forming section, and the lubricating water will be collected in the return water tank under the net to participate in the circulation. The water in the return water tank can also be used as on-site water, which 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 water return circulation subsystem for fuel cell substrate production provided in the embodiment of the present application further includes a concentrated water return pipe, and the material preparation and dispersion unit is connected to the water treatment unit through the concentrated water return pipe.

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

[0020] Optionally, the water return circulation subsystem for fuel cell substrate production provided in the embodiment of the present application further includes a water replenishment pipeline, which is connected to the under-net water return pool to replenish water into the under-net water return pool. The water lost by the fuel cell substrate due to drying can be replenished through the water replenishment pipeline.

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

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

[0023] The return water circulation subsystem and fuel cell substrate production system provided in the present application form two water flow closed loops when in use. One water flow closed loop is that the under-net return water pool sends the production return water to the dispersion and batching module to meet the water for dispersion and batching, and then sends the water to the wet forming part and enters the under-net return water pool. The other water flow closed loop is that the under-net return water pool sends the production return water to the sedimentation and filtration module to precipitate and filter the return water. The low-viscosity water formed after filtration flows back to the under-net return water pool for dilution, so that the viscosity of the return water is stabilized within the process range. The two water flow closed loops are used in the return water circulation subsystem for fuel cell substrate production. Except for part of the water lost due to drying of the fuel cell substrate, the remaining return water is fully recovered. Therefore, it will not cause pollution to the external environment due to discharge into the external environment, and there is no need to introduce iron ions and aluminum ions, etc., so that the subsystem can be applied to the production of fuel cell substrates.

[0024] The additional technical features and advantages of the present application will be more clearly explained in the following description, or can be understood through the specific practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the specific implementation methods of the present application, the following is a brief introduction to the drawings required for the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

[0028] Reference numerals:

[0029] 01. Wet forming section; 02. Under-net return water pool;

[0030] 03. Molding batching unit; 04. Material preparation and dispersion unit;

[0031] 05. Sedimentation tank; 06. Water treatment unit;

[0032] 07. Return water tank; 08. Spare pipeline. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] like Figure 1 As shown, one aspect of the present application provides a water return circulation subsystem for fuel cell substrate production, including a wet forming section 01, an under-net water return pool 02, a dispersion and proportioning module and a sedimentation and filtration module, as well as a first water supply pipe and a second water supply pipe, the under-net water return pool 02 is used to receive water sent from the wet forming section 01, the dispersion and proportioning module and the sedimentation and filtration module are both used to receive water sent from the under-net water return pool 02, the dispersion and proportioning module is connected to the wet forming section 01 through the first water supply pipe, and the sedimentation and filtration module is connected to the under-net water return pool 02 through the second water supply pipe to send the filtered water to the under-net water return pool 02.

[0037] The return water circulation subsystem and fuel cell substrate production system provided in the present application for the production of fuel cell substrates form two water flow closed loops when in use. One water flow closed loop is that the under-net return water pool 02 sends the production return water to the dispersion and batching module to meet the water for dispersion and batching, and then sends the water to the wet forming part 01 and enters the under-net return water pool 02. The other water flow closed loop is that the under-net return water pool 02 sends the production return water to the sedimentation and filtration module to precipitate and filter the return water. The low-viscosity water formed after filtration flows back to the under-net return water pool 02 for dilution, so that the viscosity of the return water is stabilized within the process range. The two water flow closed loops are used in the return water circulation subsystem for the production of fuel cell substrates. Except for part of the water lost due to drying of the fuel cell substrate, the remaining return water is fully recovered. 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 and aluminum ions, etc., so that the subsystem can be applied to the production of fuel cell substrates.

[0038] Optionally, the dispersing and batching module includes a molding and batching unit 03 and a material dispersing unit 04, as well as a first water return pipe, a second water return pipe and a third water supply pipe;

[0039] The molding batching unit 03 is connected to the under-net return water pool 02 through the first return water pipe, so that the under-net return water pool 02 delivers water to the molding batching unit 03 through the first return water pipe;

[0040] The material preparation and dispersion unit 04 is connected with the under-net return water pool 02 through the second return water pipe, so that the under-net return water pool 02 sends water to the material preparation and dispersion unit 04 through the second return water pipe;

[0041] The molding batching unit 03 is connected to the material preparation and dispersion unit 04 through a third water delivery pipe, so that the material preparation and dispersion unit 04 delivers water to the molding batching unit 03 .

[0042] like Figure 1 As shown, the sum of the amount of production return water (E) sent from the under-net return water pool 02 to the molding batching unit 03 and the amount of production return water (F) sent to the material dispersion unit 04, and the dehydration amount (A) of the wet molding section 01 only differs from the amount of evaporated water (G) taken away by the fuel cell substrate due to drying. Figure 1 Here, "t / h" is the flow unit, meaning "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, XZ 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, and 342 is a specific value of F; "cP.s" is the viscosity unit, and Y and 1 are both specific values ​​of viscosity, and ">YcP.s" means that the viscosity here is greater than YcP.s.

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

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

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

[0046] The water treatment unit 06 is connected to the under-net water return tank 02 through the fifth water supply pipe, so that the water treatment unit 06 delivers water to the under-net water return tank 02 through the fifth water supply pipe.

[0047] Optionally, the sedimentation and filtration module further includes a fifth water supply pipe, 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, and the return water tank 07 is connected to the under-net return water pool 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 low-viscosity water sent out from the water treatment unit 06 can be stored in the return water tank 07, and the water in the return water tank 07 flows back to the under-net return water pool 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 water after backwashing is sent to the return water tank 07 through the second return water pipe. Figure 1 As shown, the amount of water (B) sent from the under-net 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 sedimentation tank 05 and the amount of water (H) sent from the water treatment unit 06 to the material preparation and dispersion unit 04. In addition, the total amount of water (A+G+D) entering the under-net return water tank 02 is equal to the total amount of water (E+F+B) sent out of the under-net return water tank 02.

[0048] Optionally, the sedimentation and filtration module further includes a spare pipeline 08, one end of which is connected to the sedimentation tank 05, and the other end of which is connected to the return water tank 07. Some fuel cell substrates require a relatively high return water viscosity, and in this case, the water treatment unit 06 is not required to process the return water. In this case, the sedimentation tank 05 can be directly connected to the return water tank 07 via the spare pipeline to meet the process requirements.

[0049] Optionally, the sedimentation and filtration module further comprises a spray water pipe, one end of which is connected to the return water tank 07, and the other end of which is connected to the wet forming section 01. This allows 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 in the under-net return water tank 02 for circulation.

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

[0051] Optionally, the water return circulation subsystem for fuel cell substrate production provided in the embodiment of the present application further includes a concentrated water return pipe, and 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 concentrated water produced by the water treatment unit 06 will be recycled to the material preparation and dispersion unit 04 to reduce the amount of dispersant used in production.

[0053] Optionally, the water return circulation subsystem for fuel cell substrate production provided in the embodiment of the present application further includes a water replenishment pipeline, which is connected to the under-net water return pool 02 to replenish water into the under-net water return pool 02. The water lost by the fuel cell substrate due to drying can be replenished through the water replenishment pipeline.

[0054] Another aspect of the present application provides a fuel cell substrate production system, including a water return circulation subsystem for fuel cell substrate production provided in an embodiment of the present application.

[0055] The fuel cell substrate production system provided in the present application adopts the return water circulation subsystem for fuel cell substrate production provided in the present application. When in use, two water flow closed loops are formed. One water flow closed loop is that the under-net return water pool 02 sends the production return water to the dispersion and batching module to meet the dispersion water and batching water, and then sends the water to the wet forming part 01 and enters the under-net return water pool 02. The other water flow closed loop is that the under-net return water pool 02 sends the production return water to the sedimentation and filtration module to precipitate and filter the return water. The low-viscosity water formed after filtration flows back to the under-net return water pool 02 for dilution, so that the viscosity of the return water is stabilized within the process range. These two water flow closed loops are used in the return water circulation subsystem for fuel cell substrate production. Except for part of the water lost due to drying of the fuel cell substrate, the remaining return water is fully recovered. Therefore, it will not cause pollution to the external environment due to discharge into the external environment, and there is no need to introduce iron ions and aluminum ions, etc., so that the subsystem can 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, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A water circulation subsystem for fuel cell substrate production, characterized in that: It includes a wet forming section, a backwater tank under the mesh, a dispersing and distributing module and a sedimentation and filtration module, as well as a first water supply pipe and a second water supply pipe. The backwater tank under the mesh is used to receive water sent from the mesh section of the paper machine. The dispersing and distributing module and the sedimentation and filtration module are both used to receive water sent from the backwater tank under the mesh. The dispersing and distributing module is connected to the wet forming section through the first water supply pipe, and the sedimentation and filtration module is connected to the backwater tank under the mesh through the second water supply pipe to send the filtered water to the backwater tank under the mesh.

2. The water return circulation subsystem for fuel cell substrate production according to claim 1, characterized in that: The dispersing and batching module includes a molding and batching unit and a material dispersing unit, as well as a first water return pipe, a second water return pipe and a third water supply pipe; The molding batching unit is connected with the under-net return water pool through the first return water pipe, so that the under-net return water pool sends water to the molding batching unit through the first return water pipe; The material preparation and dispersion unit is connected with the under-net return water pool through the second return water pipe, so that the under-net return water pool sends water to the material preparation and dispersion unit through the second return water pipe; The molding batching unit is connected to the material preparation and dispersion unit through a third water delivery pipe, so that the material preparation and dispersion unit delivers water to the molding batching unit.

3. The water return circulation subsystem for fuel cell substrate production according to claim 2, characterized in that: The sedimentation 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 connected with the under-net return water tank through the third return water pipe, so that the under-net return water tank sends water to the sedimentation tank through the third return water pipe; The water treatment unit is connected to the sedimentation tank through the fourth water supply pipe, so that the sedimentation tank delivers water to the water treatment unit through the fourth water supply pipe; The water treatment unit is connected to the under-net water return tank through the fifth water delivery pipe, so that the water treatment unit delivers water to the under-net water return tank through the fifth water delivery pipe.

4. The water return circulation subsystem for fuel cell substrate production according to claim 3, characterized in that: The sedimentation and filtration module also includes a fifth water supply pipe, a return water tank and a backwash pipe. The water treatment unit is connected to the return water tank through the fourth water supply pipe, and the return water tank is connected to the under-net return water tank through the fifth water supply pipe. One end of the backwash pipe is connected to the return water tank, and the other end of the backwash pipe is connected to the water treatment unit.

5. The water return circulation subsystem for fuel cell substrate production according to claim 4, characterized in that: The sedimentation and filtration module further comprises a spare pipeline, one end of which is in communication with the sedimentation tank, and the other end of which is in communication with the return water tank.

6. The water return circulation subsystem for fuel cell substrate production according to claim 4, characterized in that: The sedimentation and filtration module further comprises a spray water pipe, one end of which is connected to the return water tank, and the other end of which is connected to the wet forming part.

7. The water return circulation subsystem for fuel cell substrate production according to claim 4, characterized in that: The sedimentation and filtration module further comprises a lubricating water pipe, one end of which is connected to the return water tank, and the other end of which is connected to the wet forming part.

8. The water return circulation subsystem for fuel cell substrate production according to claim 3, characterized in that: It also includes a concentrated water return pipe, through which the material preparation and dispersion unit is connected to the water treatment unit.

9. The water return circulation subsystem for fuel cell substrate production according to any one of claims 1 to 8, characterized in that: It also includes a water replenishment pipeline, which is connected to the under-net water return pool to replenish water into the under-net water return pool.

10. A fuel cell substrate production system, characterized in that: It comprises a water recycling subsystem for fuel cell substrate production as claimed in any one of claims 1 to 9.

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