Electrolyzed water deoxidation device
By using catalytic combustion reaction and heat exchange technology in the electrolytic water deoxygenation device, the problem of difficult control of raw materials in the prior art is solved, and safety, efficiency and cost improvements are achieved.
Patent Information
- Application Number
- CN202420614425.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The existing deoxidation technology is difficult to effectively control the temperature of the raw hydrogen in the reactor in electrolytic water equipment, resulting in frequent stopping in the early stages of the electrolytic tank to avoid the risk of explosion, reducing work efficiency and increasing costs.
An electrolytic water deoxygenation device is designed, including a reaction shell, a deoxygenation catalyst and a heat exchange medium. The raw material hydrogen undergoes a catalytic combustion reaction with the deoxygenation catalyst in the reaction shell, and heat exchange with the heat exchange medium to reduce the temperature of the raw material hydrogen and ensure that it is within a safe temperature range.
It effectively reduces the temperature of the raw material hydrogen in the reaction shell, avoids the risk of explosion caused by high temperature, improves the working efficiency and safety of the electrolytic water equipment, and reduces the number of parking times and operating costs.
Smart Images
Figure CN222648133U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrogen production by electrolysis of alkaline water, in particular to a water electrolysis deoxygenation device. Background Art
[0002] In industry, the production of hydrogen by alkaline water electrolysis is a relatively mature technical means. The working principle is as follows: direct current is passed through the two electrodes of the alkaline water electrolysis cell, and water molecules undergo oxidation reaction at the anode to generate oxygen and reduction reaction at the cathode to generate hydrogen; oxygen and hydrogen containing alkali solution enter the oxygen and hydrogen gas-liquid separators respectively, and the separated gas passes through the gas scrubber to remove a small amount of alkali solution, and then passes through the cooling separator for dehumidification to obtain the corresponding oxygen and hydrogen. In order to improve the purity of the hydrogen product, a deoxygenation device for deoxygenation is usually added to the water electrolysis equipment. The hydrogen containing trace oxygen enters the deoxygenation device for catalytic combustion reaction to remove oxygen and improve the purity of hydrogen.
[0003] The catalytic combustion reaction of hydrogen and oxygen raises the temperature of the reaction gas, and the high-temperature reaction gas enters the cooler and is sent to the subsequent process after cooling. However, the hydrogen-oxygen mixture is prone to explosion at high temperatures, so the temperature of the deoxygenation reactor should not exceed 300°C, and preferably not exceed 200°C.
[0004] However, the existing deoxygenation technology is to feed raw hydrogen containing trace impurity oxygen and saturated water vapor into an adiabatic deoxygenation reactor. When the oxygen content in the imported hydrogen increases by 1%, the reactor outlet temperature will rise by 165°C. In the early stage of electrolyzer operation, there is more impurity oxygen in the raw hydrogen, and the temperature in the reactor can easily reach 200°C, which exceeds the safe temperature range. Therefore, when the oxygen content exceeds 1%, the electrolyzer needs to be stopped. For the sake of safety, it is often stopped at 0.2%. Therefore, in the early stage of electrolyzer operation, a large amount of hydrogen obtained by electrolyzing water needs to be vented, which reduces work efficiency and increases work costs. Utility Model Content
[0005] Therefore, the utility model aims to overcome the technical problem in the prior art that the temperature of raw hydrogen in the reactor needs to be lowered, thereby providing a water electrolysis deoxygenation device.
[0006] The utility model provides a water electrolysis deoxygenation device, which is used to deoxygenate raw hydrogen obtained by water electrolysis, comprising:
[0007] A reaction shell is provided with a raw material inlet and a raw material outlet, and a deoxidation catalyst and a heat exchange medium for heat exchange with the raw material hydrogen are arranged in the reaction shell.
[0008] Furthermore, the raw material inlet is arranged at the upper end side of the reaction shell, and the raw material outlet is arranged at the lower end side of the reaction shell.
[0009] Furthermore, it also includes an upper partition plate and a lower partition plate arranged on the inner wall of the reaction shell, the upper partition plate and the lower partition plate divide the inner side of the reaction shell into three spaces, and the space between the upper partition plate and the lower partition plate is a heat exchange space.
[0010] Furthermore, a plurality of heat exchange tubes are provided between the upper partition plate and the lower partition plate, and the heat exchange tubes are connected to the raw material inlet and the raw material outlet.
[0011] Furthermore, the deoxidation catalyst is arranged in the heat exchange tube.
[0012] Furthermore, the reaction shell is provided with a medium inlet and a medium outlet, the medium inlet and the medium outlet are located on the heat exchange space, and the heat exchange medium flows to the medium outlet through the medium inlet.
[0013] Furthermore, the heat exchange medium is alkaline solution for electrolyzing water.
[0014] Furthermore, the medium inlet is located at the lower end side of the heat exchange space, and the medium outlet is located at the upper end side of the heat exchange space.
[0015] Furthermore, the medium outlet is connected to a heat exchanger.
[0016] The technical solution of the utility model has the following advantages:
[0017] The utility model provides an electrolytic water deoxygenation device, wherein raw hydrogen containing trace impurity oxygen and saturated water vapor enters from a raw material inlet. The deoxygenation catalyst can cause the raw hydrogen containing trace impurity oxygen and saturated water vapor to undergo a catalytic combustion reaction, while releasing heat, and the heat exchange medium can take away the heat carried by the raw hydrogen itself and the heat generated by the catalytic combustion reaction through heat exchange, thereby reducing the temperature of the raw hydrogen in the reaction shell, so that the temperature of the raw hydrogen in the reaction shell is within a safe range. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a schematic diagram of the structure of the utility model.
[0020] Description of reference numerals;
[0021] 1. Reaction shell; 2. Raw material inlet; 3. Raw material outlet; 4. Upper partition plate; 5. Lower partition plate; 6. Heat exchange tube; 7. Medium inlet; 8. Medium outlet. DETAILED DESCRIPTION
[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] In the description of the present invention, 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 invention 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 invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the present invention can be understood according to specific circumstances.
[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0026] Example
[0027] like Figure 1 A specific embodiment of a water electrolysis deoxygenation device is shown, which is used to deoxygenate raw hydrogen obtained by electrolyzing water, comprising:
[0028] A reaction shell 1 is provided with a raw material inlet 2 and a raw material outlet 3. A deoxidation catalyst and a heat exchange medium for heat exchange with raw material hydrogen are provided in the reaction shell 1. The deoxidation catalyst can cause the raw material hydrogen containing trace impurity oxygen and saturated water vapor to undergo a catalytic combustion reaction while releasing heat. The heat exchange medium can take away the heat carried by the raw material hydrogen itself and the heat generated by the catalytic combustion reaction through heat exchange, thereby reducing the temperature of the raw material hydrogen in the reaction shell 1. The raw material hydrogen containing trace impurity oxygen and saturated water vapor enters from the raw material inlet 2, and the raw material outlet 3 flows out the deoxidized raw material hydrogen.
[0029] Furthermore, the raw material inlet 2 is arranged at the upper end side of the reaction shell 1, and the raw material outlet 3 is arranged at the lower end side of the reaction shell 1. Since the density of raw material hydrogen is less than the density of air, if raw material hydrogen enters from the lower end side, it will immediately flow out from the upper end side, the time of catalytic reaction will be reduced, and the efficiency of deoxidation is poor. When raw material hydrogen enters from the upper end side, it will immediately flow out from the lower end side, and the raw material hydrogen will accumulate at the upper end side and gradually flow to the lower end side. This method will increase the time of catalytic reaction and enhance the deoxidation effect.
[0030] Furthermore, it also includes an upper partition plate 4 and a lower partition plate 5 arranged on the inner wall of the reaction shell 1, and the upper partition plate 4 and the lower partition plate 5 divide the inner side of the reaction shell 1 into three spaces, and the space between the upper partition plate 4 and the lower partition plate 5 is a heat exchange space. It should be noted that the raw material inlet 2 is connected to the space located at the upper end of the upper partition plate 4 in the reaction shell 1, and the raw material outlet 3 is connected to the space located at the lower end of the lower partition plate 5 in the reaction shell 1. The space at the upper end of the upper partition plate 4 should be connected to the space at the lower end of the lower partition plate 5 in the reaction shell 1, so that the raw material hydrogen can flow smoothly from the raw material inlet 2 to the raw material outlet 3, and the heat exchange medium is arranged in the heat exchange space, and the heat exchange space should be isolated and not connected with the space at the upper end of the upper partition plate 4 and the space at the lower end of the lower partition plate 5.
[0031] Furthermore, a plurality of heat exchange tubes 6 are provided between the upper partition plate 4 and the lower partition plate 5, and the heat exchange tubes 6 are connected to the raw material inlet 2 and the raw material outlet 3. The raw hydrogen flows from the raw material inlet 2 to the raw material outlet 3 through the heat exchange tubes 6, and at the same time, performs heat exchange with the heat exchange medium in the heat exchange space, so that the temperature of the raw hydrogen is reduced.
[0032] Furthermore, the deoxidation catalyst is arranged in the heat exchange tube 6. The deoxidation catalyst only contacts with the raw hydrogen and catalyzes the combustion reaction of the raw hydrogen.
[0033] Furthermore, the reaction shell 1 is provided with a medium inlet 7 and a medium outlet 8, the medium inlet 7 and the medium outlet 8 are located on the heat exchange space, and the heat exchange medium flows to the medium outlet 8 through the medium inlet 7. The heat exchange medium passing through the medium inlet 7 and the medium outlet 8 can be circulated by an external circulation pump, and the heat exchange medium can take out the heat in the heat exchange medium after heat exchange with the outside air or the refrigerator. Of course, the heat exchange medium can also be non-circulating, and this embodiment is not limited to this.
[0034] Furthermore, the heat exchange medium is an alkali solution for electrolyzing water, which can be reused to reduce resource waste.
[0035] Furthermore, the medium inlet 7 is located at the lower end side of the heat exchange space, and the medium outlet 8 is located at the upper end side of the heat exchange space. The heat exchange medium flows from the medium inlet 7 to the medium outlet 8, and the heat exchange medium first accumulates at the medium inlet 7 and gradually flows to the medium outlet 8. The flow direction of the heat exchange medium is opposite to that of the raw hydrogen, which can increase the heat exchange time between the heat exchange medium and the raw hydrogen and enhance the cooling efficiency of the raw hydrogen.
[0036] Furthermore, the medium outlet 8 is connected to a heat exchanger. The heat exchanger can remove the temperature in the heat exchange medium, and the cooled heat exchange medium can be recycled, so that the heat exchange medium passing through the medium inlet 7 and the medium outlet 8 is a circulation loop, reducing resource waste.
[0037] The temperature at the raw material inlet 2 of the reaction shell 1 is generally 30°C-40°C.
[0038] During the experiment, the temperature of the raw material hydrogen at the raw material inlet 2 of the present application was 32°C, the oxygen content was 1000ppm, and the volume space velocity was 32000h -1 The raw material hydrogen enters the reaction shell 1 from the raw material inlet 2, and the gas undergoes catalytic combustion reaction through the heat exchange tube 6, releasing heat. At the same time, the circulating heat exchange medium electrolyzed water alkali solution enters the heat exchange space from the medium inlet 7, flows through the gap of the heat exchange tube 6, takes away the reaction heat, and then flows out from the medium outlet 8, working in a cycle. The device runs for 500 hours, and the temperature at the raw material outlet 3 is maintained at 80°C, and the oxygen content is 0.2ppm. It meets the production requirements.
[0039] As a comparative experiment, an adiabatic reactor was used, with the raw hydrogen temperature at the inlet being 32°C, the oxygen content being 12000 ppm, and the volume space velocity being 32000 h -1 The raw hydrogen enters the reactor from the inlet, and the temperature at the outlet will reach 230°C, reaching explosion conditions. It cannot continue to operate and needs to be cut off and vented.
[0040] Therefore, it can be known that, compared with the existing adiabatic reactor, the present application can fully ensure that the temperature of the raw hydrogen in the reaction shell 1 is within a safe range.
[0041] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.
Claims
1. A water electrolysis deoxygenation device, used for deoxygenating raw hydrogen obtained by water electrolysis, characterized in that: include: A reaction shell (1) is provided with a raw material inlet (2) and a raw material outlet (3), and a deoxidation catalyst and a heat exchange medium for heat exchange with raw material hydrogen are arranged in the reaction shell (1).
2. The electrolytic water deoxygenation device according to claim 1, characterized in that: The raw material inlet (2) is arranged on the upper end side of the reaction shell (1), and the raw material outlet (3) is arranged on the lower end side of the reaction shell (1).
3. The electrolytic water deoxygenation device according to claim 1, characterized in that: It also comprises an upper partition plate (4) and a lower partition plate (5) arranged on the inner wall of the reaction shell (1), wherein the upper partition plate (4) and the lower partition plate (5) divide the inner side of the reaction shell (1) into three spaces, and the space between the upper partition plate (4) and the lower partition plate (5) is a heat exchange space.
4. The electrolytic water deoxygenation device according to claim 3, characterized in that: A plurality of heat exchange tubes (6) are arranged between the upper partition plate (4) and the lower partition plate (5), and the heat exchange tubes (6) are connected to the raw material inlet (2) and the raw material outlet (3).
5. The electrolytic water deoxygenation device according to claim 4, characterized in that: The deoxidation catalyst is arranged in the heat exchange tube (6).
6. The electrolytic water deoxygenation device according to claim 1, characterized in that: The reaction shell (1) is provided with a medium inlet (7) and a medium outlet (8), the medium inlet (7) and the medium outlet (8) are located on the heat exchange space, and the heat exchange medium flows to the medium outlet (8) through the medium inlet (7).
7. The electrolytic water deoxygenation device according to claim 1, characterized in that: The heat exchange medium is alkali solution for electrolyzing water.
8. The electrolytic water deoxygenation device according to claim 6, characterized in that: The medium inlet (7) is located at the lower end side of the heat exchange space, and the medium outlet (8) is located at the upper end side of the heat exchange space.
9. The electrolytic water deoxygenation device according to claim 6, characterized in that: The medium outlet (8) is connected to a heat exchanger.