Device for preventing metal pipeline from being corroded by electrochemical replacement reaction by electrolyzing carbon dioxide

Abstract

The utility model provides a device for preventing an electrochemical replacement reaction from corroding a metal pipeline by electrolyzing carbon dioxide, relates to the field of electrochemistry, and solves the problem that the electrochemical reaction between metal ions in electrolyte and the metal pipeline is difficult to prevent on the premise that a galvanic pile is designed into a pressure type galvanic pile. The device comprises a connecting pipeline and a galvanic pile flange, the connecting pipeline is a metal pipeline, a pipe opening is formed in the connecting pipeline, the galvanic pile flange is fixed to a galvanic pile inlet and / or a galvanic pile outlet, the pipe opening is communicated with the galvanic pile flange, the connecting pipeline is used for allowing electrolyte to pass through, and a spraying layer is sprayed and adhered to the inner wall of the connecting pipeline. The inner wall of the connecting pipeline is isolated from the electrolyte; according to the device, the spraying layer is sprayed on the inner wall of the connecting pipeline, so that when the pressure type galvanic pile is electrified for electrolysis, the replacement reaction of metal ions and the metal pipeline under the action of current in the electrolyte at the inlet and the outlet of the galvanic pile in the connecting pipeline can be prevented, and the pipeline is prevented from being corroded.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemistry, in particular to a device for electrolyzing carbon dioxide to prevent electrochemical replacement reaction from corroding metal pipelines. Background Art

[0002] Using green electricity to electrolyze CO2 and water to produce syngas (CO and H2), a key chemical raw material, has been a hotly researched emerging technology in recent years and is considered a key approach to reducing carbon emissions and reusing resources. However, the electrolyte used in the CO2 electrolysis process is carbonate. When electrolysis is applied, these free metal ions easily undergo a replacement reaction with iron ions in metal pipes, causing corrosion.

[0003] In order to prevent the metal ions in the electrolyte from electrochemically reacting with the metal pipe, a common measure in the prior art is to select and install a section of plastic chemical pipe according to the medium characteristics of the electrolyte.

[0004] The applicant has discovered that the existing technology presents at least the following technical issues: For some pressure-type fuel cell stacks, the addition of plastic piping is often subject to the influence of the device pressure, making it impossible to use as a pressure-type fuel cell reactor, thus severely restricting its use environment. Therefore, under the premise of designing the fuel cell stack as a pressure-type stack, ensuring sealing performance and preventing electrochemical reactions between metal ions in the electrolyte and the metal piping have become urgent technical issues to be solved. Utility Model Content

[0005] The purpose of the present utility model is to provide a device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reactions, so as to solve the technical problem in the prior art that it is difficult to prevent electrochemical reactions between metal ions in the electrolyte and metal pipes when the fuel cell stack is designed as a pressure-type fuel cell stack; the many technical effects that can be produced by the preferred technical solution among the many technical solutions provided by the present utility model are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The utility model provides a device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction, comprising a connecting pipe and a stack flange, wherein:

[0008] The connecting pipe is a metal pipe, and a pipe mouth is provided on the connecting pipe. The stack flange is fixed at the stack inlet and / or stack outlet, and the pipe mouth is connected to the stack flange. The connecting pipe is used to accommodate the passage of electrolyte, and a spray layer is sprayed and adhered on the inner wall of the connecting pipe to isolate the inner wall of the connecting pipe from the electrolyte.

[0009] Preferably, the spray coating is a plastic-lined coating or an inactive metal coating.

[0010] Preferably, the connecting pipeline includes a liquid inlet pipeline and a liquid outlet pipeline, wherein:

[0011] The stack flange includes a stack inlet flange and a stack outlet flange, the liquid inlet pipeline is fixedly connected and communicated with the stack inlet flange, the liquid outlet pipeline is fixedly connected and communicated with the stack outlet flange, and the spray layer is sprayed and adhered on the inner walls of the liquid inlet pipeline and the liquid outlet pipeline.

[0012] Preferably, a first assembly flange is fixedly provided on one end of the liquid inlet pipeline and the liquid outlet pipeline for being fixed to the fuel cell stack flange.

[0013] Preferably, a second assembly flange is fixed to one end of the liquid inlet pipeline and the liquid outlet pipeline for connection with an external pipeline.

[0014] Preferably, the length of the connecting pipe is greater than 2m.

[0015] Preferably, the distance between the stack flange and the positive and negative power supply terminals of the stack is in the range of 0.5-1m.

[0016] Preferably, the plastic lining coating is a tetrafluoroethylene coating or a polytetrafluoroethylene coating.

[0017] Preferably, the inactive metal coating is any one of gold, silver, nickel and tin coating.

[0018] Preferably, two groups of the stack flanges are provided on the stack, and two groups of the connecting pipes are provided correspondingly, and the stack flanges and the connecting pipes in each group are arranged at intervals in the vertical direction or the horizontal direction.

[0019] The device provided by the utility model for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reactions has the following advantages over existing technologies: by spraying a coating on the inner wall of a connecting pipe, the device connects the stack to an external pipe via the connecting pipe and the stack flange. When the pressure-type stack is energized for electrolysis, the device prevents metal ions in the electrolyte at the stack inlet and outlet from undergoing a replacement reaction with the metal pipe under the action of the current in the connecting pipe, thereby preventing corrosion of the pipe. The device protects the structure of the metal pipe and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the exploded structure of the device and the stack for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction;

[0022] Figure 2 It is a three-dimensional schematic diagram of the coordinated structure of the device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction and the fuel cell stack;

[0023] Figure 3 This is a side view of the coordinated structure of the device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reactions and the fuel cell stack.

[0024] In the figure, 1, connecting pipe; 11, liquid inlet pipeline; 12, liquid outlet pipeline; 2, first assembly flange; 3, spray layer; 4, fuel cell stack flange; 41, fuel cell stack inlet flange; 42, fuel cell stack outlet flange; 5, second assembly flange; 100, fuel cell stack. DETAILED DESCRIPTION

[0025] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center," "length," "width," "height," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and "side" and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0027] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] An embodiment of the utility model provides a device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reactions. The device can prevent the electrolyte at the inlet and outlet of the battery stack from undergoing replacement reactions with metal ions in the connecting pipes under the action of the current when the battery stack is energized for electrolysis, thereby preventing corrosion of the pipes.

[0029] The following combination Figure 1-Figure 3 The technical solution provided by the utility model is described in more detail.

[0030] like Figure 1 and Figure 3 As shown, the arrow direction in the figure is the flow direction of the electrolyte. The device for electrolyzing carbon dioxide to prevent the electrochemical replacement reaction from corroding the metal pipe provided by the utility model comprises a connecting pipe 1 and a stack flange 4. The connecting pipe 1 is a metal pipe with a pipe mouth provided on the connecting pipe 1. The stack flange 4 is fixed at the stack inlet and / or the stack outlet. The pipe mouth is connected to the stack flange 4. The connecting pipe 1 is used to accommodate the passage of the electrolyte. The inner wall of the connecting pipe 1 is sprayed with a spray layer 3 for isolating the inner wall of the connecting pipe 1 from the electrolyte.

[0031] This device sprays a coating 3 on the inner wall of a connecting pipe 1, which connects the fuel cell stack 100 to an external pipe via the connecting pipe 1 and the stack flange 4. When the pressure-type fuel cell stack 100 is energized for electrolysis, it prevents metal ions in the electrolyte at the stack inlet and outlet from reacting with the metal pipe under the influence of the current within the connecting pipe 1, thereby preventing corrosion of the pipe. This device protects the structure of the metal pipe and extends its service life.

[0032] As an optional embodiment, the spray coating 3 of this embodiment is a plastic-lined coating or an inactive metal coating. The plastic-lined coating is a tetrafluoroethylene coating or a polytetrafluoroethylene coating. The inactive metal coating is any one of gold, silver, nickel, and tin coatings, preferably a tin coating, which effectively reduces costs.

[0033] The interior of the connecting pipe 1 is sprayed with a plastic lining coating, which can adhere tightly to the inner wall of the connecting pipe 1 and has good adhesion performance. The interior of the connecting pipe 1 is sprayed with an inactive metal coating, which can ensure the adhesion between the inactive metal coating and the metal connecting pipe 1 and protect the connecting pipe 1 at the same time.

[0034] As an alternative embodiment, see Figure 1 and Figure 2As shown, the connecting pipeline 1 includes a liquid inlet pipeline 11 and a liquid outlet pipeline 12, wherein: the stack flange 4 includes a stack inlet flange 41 and a stack outlet flange 42, the liquid inlet pipeline 11 is fixedly connected and communicated with the stack inlet flange 41, the liquid outlet pipeline 12 is fixedly connected and communicated with the stack outlet flange 42, and the inner walls of the liquid inlet pipeline 11 and the liquid outlet pipeline 12 are sprayed with an adhesive spray layer 3.

[0035] The above structure can facilitate the fixed connection and communication between the liquid inlet pipeline 11 and the fuel cell stack inlet flange 41, and facilitate the fixed connection and communication between the liquid outlet pipeline 12 and the fuel cell stack outlet flange 42, so as to enable the electrolyte to enter and flow out of the fuel cell stack.

[0036] See also Figure 1 and Figure 2 As shown, the first mounting flange 2 is fixedly provided at one end of the liquid inlet pipeline 11 and the liquid outlet pipeline 12 for fixing to the fuel cell stack flange 4. This facilitates the fixed connection of the liquid inlet pipeline 11 to the fuel cell stack inlet flange 41 and the fixed connection of the liquid outlet pipeline 12 to the fuel cell stack outlet flange 42.

[0037] A second assembly flange 5 is fixed to one end of the liquid inlet pipeline 11 and the liquid outlet pipeline 12 for connection with the external pipeline, so as to facilitate the fixed connection of the liquid inlet pipeline 11 and the liquid outlet pipeline 12 with the external pipeline.

[0038] The corresponding flanges can be assembled and fixed by bolts and nuts, which is convenient for disassembly and installation.

[0039] As an optional embodiment, the length of the connecting pipe 1 is greater than 2 m. The distance between the stack flange 4 and the positive and negative power supply terminals of the stack 100 is within the range of 0.5-1 m.

[0040] This setting is because the current in the conductor will preferentially move along the conductor with low resistance. The length of the connecting pipe 1 is as long as possible, and the distance between the stack flange 4 and the positive and negative power terminals of the stack is as short as possible, which can effectively prevent the current from corroding the pipeline over a long distance along the connecting pipe 1.

[0041] As an alternative embodiment, see Figure 3 As shown, two sets of stack flanges 4 are provided on the stack, and two corresponding sets of connecting pipes 1 are provided. Each set of stack flanges 4 and connecting pipes 1 are arranged at intervals in the vertical or horizontal direction. The above structure facilitates increasing the flow rate of electrolyte in and out of the stack 100.

[0042] In the above structure, the existing conventional chemical UPVC pipes can be omitted. Instead, a structure in which the connecting pipe 1 and the stack flange 4 cooperate with each other is used to facilitate the external electrolyte circulation system to be connected to the external pipe using the flange, thereby achieving the purpose of connecting the entire electrolysis system.

[0043] An embodiment of the present utility model provides a device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reactions. The device is connected and sealed mechanically between the first assembly flange 2 on the connecting pipe 1 and the stack flange 4 on the stack 100. The connecting pipe 1 connects the stack 100 to the external pipe, so that the anode and cathode of the stack equipment can normally enter and exit the electrolyte.

[0044] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction, characterized in that: Including connecting pipes and stack flanges, including: The connecting pipe is a metal pipe, and a pipe mouth is provided on the connecting pipe. The stack flange is fixed at the stack inlet and / or stack outlet, and the pipe mouth is connected to the stack flange. The connecting pipe is used to accommodate the passage of electrolyte, and a spray layer is sprayed and adhered on the inner wall of the connecting pipe to isolate the inner wall of the connecting pipe from the electrolyte.

2. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 1, characterized in that: The spray coating is a plastic-lined coating or an inactive metal coating.

3. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 1, characterized in that: The connecting pipeline includes a liquid inlet pipeline and a liquid outlet pipeline, wherein: The stack flange includes a stack inlet flange and a stack outlet flange, the liquid inlet pipeline is fixedly connected and communicated with the stack inlet flange, the liquid outlet pipeline is fixedly connected and communicated with the stack outlet flange, and the spray layer is sprayed and adhered on the inner walls of the liquid inlet pipeline and the liquid outlet pipeline.

4. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 3, characterized in that: A first assembly flange is fixedly provided at one end of the liquid inlet pipeline and the liquid outlet pipeline for being fixed to the fuel cell stack flange.

5. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 3, characterized in that: A second assembly flange is fixed to one end of the liquid inlet pipeline and the liquid outlet pipeline for connecting with an external pipeline.

6. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 1, characterized in that: The length of the connecting pipe is greater than 2m.

7. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 6, characterized in that: The distance between the stack flange and the positive and negative power supply terminals of the stack is within the range of 0.5-1m.

8. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 2, characterized in that: The plastic lining coating is a tetrafluoroethylene coating or a polytetrafluoroethylene coating.

9. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 2, characterized in that: The inactive metal coating is any one of gold, silver, nickel and tin coatings.

10. The device for electrolyzing carbon dioxide to prevent corrosion of metal pipes by electrochemical replacement reaction according to claim 1, characterized in that: Two groups of the stack flanges are provided on the stack, and two groups of the connecting pipes are provided correspondingly. The stack flanges and the connecting pipes in each group are arranged at intervals in the vertical direction or the horizontal direction.

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