A cooling and washing device for producing hydrogen by electrolysis of water

Abstract

The present application proposes a cooling and washing device for producing hydrogen by electrolysis of water, comprising: a shell; the shell having a liquid inlet, the liquid inlet being used to inject washing liquid into the shell; a vent pipe, the vent pipe being located in the shell, the air inlet end of the vent pipe extending out of the top end of the shell, the air outlet end of the vent pipe extending into the shell and immersed below the liquid level; a cooling pipe, the cooling pipe being sleeved on the outside of the vent pipe, the cooling pipe and the vent pipe being spaced apart, the cooling pipe being used to pass cooling water to cool the vent pipe, by sleeved on the outside of the vent pipe, the cooling water is injected into the cooling pipe, the hydrogen is cooled by the cooling pipe during the process of being transported from top to bottom, the condensed hydrogen is fully contacted with the washing liquid for washing, and the alkali liquid carried in the hydrogen is further removed, the structure is simple and compact, the cooling, washing and separation effects are excellent, and the alkali liquid recovery is effectively realized at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production equipment, and in particular to a cooling and washing device for producing hydrogen by electrolysis of water. Background Art

[0002] Hydrogen production by electrolysis of water is to apply a certain DC voltage at both ends of the electrolytic cell electrodes. This voltage must be greater than the decomposition voltage of water. Water molecules will undergo an oxidation reaction at the anode to produce oxygen and a reduction reaction at the cathode to produce hydrogen. In the process of hydrogen production by electrolysis of water, some easily ionized electrolytes are usually added to increase the conductivity of the electrolyte. Alkaline electrolytes have a strong hydrogen production effect and will not corrode equipment such as electrodes and electrolytic cells. KOH or NaOH solutions are usually used as electrolytes. Alkaline solution is pumped into the electrolytic cell to produce hydrogen and oxygen after electrolysis. Since the rated working current passing through the electrolytic cell is large and the temperature of the electrolytic cell is high, the hydrogen produced by electrolysis has a high temperature and carries a certain amount of alkali solution, which affects the purity of the hydrogen and causes the loss of alkali solution. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the purpose of the present application is to propose a cooling and washing device for hydrogen production by electrolysis of water, in which a cooling pipe is sleeved on the outside of a vent pipe, cooling water is injected into the cooling pipe, and hydrogen is cooled by the cooling pipe during the process of being transported from top to bottom. The alkali liquid carried in the hydrogen condenses into water droplets after cooling and flows into the bottom of the shell for recovery, and the shell has a liquid inlet, and washing liquid is injected into the shell from the liquid inlet. The air outlet end of the vent pipe is immersed in the washing liquid, and the condensed hydrogen is fully contacted with the washing liquid for washing, and the alkali liquid carried in the hydrogen is further removed. The separation of hydrogen and liquid is fully realized by condensing and washing the alkali liquid in the hydrogen. The structure is simple and compact, and the cooling, washing and separation effects are excellent, and the alkali liquid recovery is effectively realized.

[0005] To achieve the above-mentioned purpose, the present application proposes a cooling and washing device for electrolyzing water to produce hydrogen, comprising: a shell; the shell having a liquid inlet, the liquid inlet being used to inject washing liquid into the shell; a vent pipe, the vent pipe being located in the shell, the vent pipe inlet end extending out of the top of the shell, the vent pipe outlet end extending into the shell and immersed below the liquid level; a cooling pipe, the cooling pipe being sleeved on the outside of the vent pipe, the cooling pipe and the vent pipe being spaced apart, the cooling pipe being used to pass cooling water to cool the vent pipe.

[0006] Furthermore, the air outlet end of the vent pipe is a bell-mouth structure, and the edge of the bell-mouth structure is provided with a toothed structure.

[0007] Furthermore, the bottom angle of the bell-mouth structure ranges from 30° to 75°.

[0008] Furthermore, a water inlet is provided at the lower end of the cooling pipe, and a water outlet is provided at the upper end of the cooling pipe.

[0009] Furthermore, the outer side wall of the cooling pipe is fixedly connected to the shell, and the upper end of the cooling pipe is fixedly connected to the upper end of the ventilation pipe via a connecting piece.

[0010] Furthermore, the connecting piece is a flange.

[0011] Furthermore, a plurality of fins are arranged between the cooling pipe and the ventilation pipe, and the plurality of fins are evenly arranged at equal angles on the outer peripheral wall of the ventilation pipe.

[0012] Furthermore, one end of the fin is fixedly connected to the outer side wall of the ventilation pipe, and the other end of the fin is spaced apart from the inner side wall of the cooling pipe.

[0013] Furthermore, the spacing distance between the fin and the inner wall of the cooling tube is 1 / 4 of the length of the fin.

[0014] Furthermore, an air outlet is provided at the upper end of the shell.

[0015] Furthermore, it also includes a demister, which is sleeved on the outside of the cooling pipe and located below the air outlet.

[0016] Furthermore, a liquid outlet is provided at the bottom end of the shell.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a cooling and washing device for producing hydrogen by electrolysis of water proposed in one embodiment of the present application;

[0020] Figure 2 yes Figure 1 AA section view. DETAILED DESCRIPTION

[0021] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0022] Figure 1 It is a structural schematic diagram of a cooling and washing device for producing hydrogen by electrolysis of water proposed in one embodiment of the present application.

[0023] See also Figure 1 , a cooling and washing device for producing hydrogen by electrolysis of water, comprising:

[0024] Shell 1; specifically, the shell is a can-shaped container, which is hollow inside and lined with hydrogen corrosion-resistant materials or hydrogen-resistant materials to increase its service life. The shell can be formed by combining two parts, upper and lower, so as to facilitate the disassembly of the shell and the assembly of parts inside it. Of course, in other embodiments, the shell can also be of other shapes, which are not limited here. The shell 1 has a liquid inlet 2, and the liquid inlet 2 is used to inject washing liquid into the shell 1; the washing liquid uses condensed water or pure water, and the condensed water is the recycled condensed water of the hydrogen production system. The condensed water is pure water without impurities, and pure water is added when the condensed water is insufficient. In this embodiment, the liquid inlet is arranged on the outer side wall of the lower part of the shell, and protrudes outward to form a tubular structure to facilitate the external connection equipment and the injection of washing liquid.

[0025] The vent pipe 3 is located in the shell 1, the air inlet end of the vent pipe 3 extends out of the top of the shell 1, and the air outlet end of the vent pipe 3 extends into the interior of the shell 1 and is immersed below the liquid level; in this embodiment, the vent pipe is a straight tubular structure, the upper end of which is the air inlet end, protruding from the top of the shell, and the lower end is the air outlet end, immersed in the washing liquid. It can be understood that since the full-body pipe is in contact with hydrogen for a long time, it is preferably made of a material resistant to hydrogen corrosion.

[0026] The cooling pipe 4 is sleeved on the outside of the ventilation pipe 3. The cooling pipe 4 and the ventilation pipe 3 are spaced apart. The cooling pipe 4 is used to pass cooling water to cool the ventilation pipe 3. It can be understood that the diameter of the cooling pipe is larger than the diameter of the ventilation pipe. The cooling pipe is sleeved on the outside of the ventilation pipe. The inner wall of the cooling pipe and the outer wall of the ventilation pipe form an annular cavity structure for passing cooling water. Specifically, the upper end of the cooling pipe 4 extends out of the top of the shell 1, and the outer wall of the cooling pipe 4 and the top of the shell 1 are fixedly connected together by welding. In other embodiments, the cooling pipe and the shell can also be detachably connected by means of snap-on connection, etc. The top of the cooling pipe 4 and the top of the ventilation pipe 3 are fixedly connected together by a flange for easy disassembly. Specifically, the ventilation pipe and the flange are threadedly connected, and the top of the cooling pipe has an edge, and the edge of the cooling pipe is connected to the flange by bolts.

[0027] The outlet end of the vent pipe 3 is a bell-mouth structure, and the edge of the bell-mouth structure is provided with a toothed structure. The bell-mouth structure can reduce the gas flow rate, so that the hydrogen and the washing liquid are fully in contact, so as to better wash the hydrogen. Preferably, the edge of the bell-mouth is provided with a toothed structure, and the large bubbles generated by the hydrogen passing into the washing liquid will be punctured by the toothed structure when escaping to the outside, so as to avoid the generation of large bubbles when the hydrogen turns up, so that the hydrogen flows evenly upward, so as to more fully wash the hydrogen.

[0028] The bottom angle of the bell-mouth structure ranges from 30° to 75°. Within this angle range, hydrogen can diffuse into the washing liquid more quickly, thereby alleviating the impact of hydrogen on the washing liquid and avoiding the formation of too many large bubbles.

[0029] The lower end of the cooling pipe 4 is provided with a water inlet 5, and the upper end of the cooling pipe 4 is provided with a water outlet 6. In order to facilitate the supply and drainage of cooling water, it can be understood that the water inlet and the water outlet are both extended to the outside of the shell. It can be understood that hydrogen is input from the vent pipe from top to bottom, and cooling water is pumped into the cooling pipe from the lower end of the cooling pipe and flows out from bottom to top. Such a reverse operation mode of hydrogen and cooling water is more conducive to the full and rapid cooling of hydrogen.

[0030] The outer wall of the cooling pipe 4 is fixedly connected to the shell 1, and the upper end of the cooling pipe 4 is fixedly connected to the upper end of the ventilation pipe 3 by a connecting piece. Specifically, the cooling pipe extends out of the shell, and the joint of the cooling pipe and the shell is sealed and welded together. Preferably, in order to improve the connection strength between the cooling pipe and the shell, reinforcing ribs can also be provided between the cooling pipe and the shell, and the upper end of the ventilation pipe is threadedly connected with a flange. The upper end of the cooling pipe and the flange are fixedly connected by bolts, so that the cooling pipe and the ventilation pipe can be disassembled and repaired conveniently.

[0031] The connecting piece is a flange. The flange is overlapped on the port of the outer wall of the cooling pipe. The port of the outer wall of the cooling pipe is annular. The outer diameter of the annular ring is the same as the outer diameter of the flange. The flange is installed and fixed by a nut. The flange structure is simple and durable, and it is easy to realize the rapid installation and removal of the cooling pipe and the ventilation pipe.

[0032] See also Figure 2 A plurality of fins 7 are arranged between the cooling pipe 4 and the ventilation pipe 3. The plurality of fins 7 are evenly arranged at equal angles on the outer peripheral wall of the ventilation pipe 3. The number of fins can be set according to the size of the outer diameter of the ventilation pipe, and is not limited here. The fins and the ventilation pipe are an integrated structure, which can be conveniently removed and disassembled as a whole for maintenance. The function of the fins is to enhance heat dissipation. The middle pipe is hot hydrogen, which increases its heat dissipation surface, enhances heat conduction, and quickly conducts the heat of the hot hydrogen to cold water for cooling.

[0033] One end of the fin 7 is fixedly connected to the outer wall of the ventilation pipe 3, and the other end of the fin 7 is spaced apart from the inner wall of the cooling pipe 4, so as to increase the heat dissipation surface of the ventilation pipe while ensuring that the cooling water passing through the pipe can be evenly distributed between each fin to achieve a better cooling effect.

[0034] The spacing distance between the fin 7 and the inner wall of the cooling tube 4 is 1 / 4 of the length of the fin 7, so as to provide sufficient space for the flow of cooling water between the cooling tube and the ventilation tube, so that the cooling water introduced can be quickly and evenly filled into the cooling tube to achieve a more stable cooling effect.

[0035] The upper end of the shell 1 is provided with an outlet 8. The hydrogen after washing and cooling finally reaches the outlet for easy recovery. The hydrogen can be further processed by a subsequent drying device and a purification device to obtain pure hydrogen. It can be understood that the outlet is provided on the side wall of the upper part of the shell to provide sufficient sedimentation distance for the liquid in the hydrogen.

[0036] A cooling and washing device for producing hydrogen by electrolysis of water also includes a demister 9, which uses a stainless steel filter to defoam and remove foam from the gas phase passing through, captures the mist in the gas phase, and reduces the water content of the gas phase. The demister 9 is sleeved on the outside of the cooling pipe 4 and is located below the gas outlet 8. It can be understood that in order to achieve a better defoaming effect, the outer diameter of the demister and the inner diameter of the shell are adapted, so that all washed hydrogen passes through the demister to remove water vapor, and when the liquid carried in the hydrogen overflowing from the washing liquid passes through the demister, the droplets sink to the bottom of the shell under the action of gravity, and the liquid in the hydrogen is filtered and removed.

[0037] The bottom end of the shell 1 is provided with a liquid outlet 10, through which the washed alkali solution is discharged and can be sent to the electrolytic cell for recycling.

[0038] In other embodiments, in order to achieve a better washing effect, the washing liquid needs to be kept as pure water. On the one hand, a large amount of pure water is continuously supplied through the liquid inlet, and on the other hand, the water is continuously discharged through the liquid outlet. By controlling the liquid inlet and outlet volumes, the amount of washing liquid in the shell is always in dynamic balance, providing pure water of higher purity and achieving better washing quality.

[0039] The hot hydrogen carries the alkali solution from the air inlet end of the vent pipe and enters the lower part of the shell through the vent pipe; the washing liquid enters the shell through the liquid inlet, and the washing liquid immerses the air outlet end of the vent pipe. The washing liquid is fully contacted with the hydrogen for washing, and the alkali solution carried in the hydrogen is removed. The alkali solution can be recovered and reused through the liquid outlet. The washed hydrogen overflows from the liquid surface and flows to the upper part of the shell through the demister, and is discharged from the air outlet to the next process; cooling water is fed in from the cooling water upper water inlet, and the cooling pipe is clamped on the air pipe. The cooling pipe cools the hydrogen through the circulating cooling water and discharges it from the cooling pipe outlet.

[0040] The cooling and washing device for producing hydrogen by electrolysis of water in this embodiment can also be provided with multiple groups and arranged in series for use, so as to achieve the effect of cooling and washing the hydrogen multiple times.

[0041] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0042] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0043] 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 application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A cooling and washing device for producing hydrogen by electrolysis of water, characterized in that: include: case; The housing has a liquid inlet, and the liquid inlet is used to inject washing liquid into the housing; A vent pipe, the vent pipe is located in the shell, the air inlet end of the vent pipe extends out of the top of the shell, and the air outlet end of the vent pipe extends into the shell and is immersed below the liquid surface; A cooling pipe, wherein the cooling pipe is sleeved on the outside of the ventilation pipe, the cooling pipe and the ventilation pipe are spaced apart, and the cooling pipe is used to pass cooling water to cool the ventilation pipe; an upper water inlet is provided at the lower end of the cooling pipe, and a water outlet is provided at the upper end of the cooling pipe; a plurality of fins are provided between the cooling pipe and the ventilation pipe, and the plurality of fins are evenly arranged at equal angles on the outer peripheral wall of the ventilation pipe, one end of the fin is fixedly connected to the outer side wall of the ventilation pipe, and the other end of the fin is spaced apart from the inner side wall of the cooling pipe.

2. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The air outlet end of the vent pipe is a bell-mouth structure, and a tooth-shaped structure is arranged at the edge of the bell-mouth structure.

3. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 2, characterized in that: The bottom angle of the bell mouth structure ranges from 30° to 75°.

4. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The outer side wall of the cooling pipe is fixedly connected to the shell, and the upper end of the cooling pipe is fixedly connected to the upper end of the ventilation pipe via a connecting piece.

5. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 4, characterized in that: The connecting piece is a flange.

6. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The spacing distance between the fin and the inner wall of the cooling tube is 1 / 4 of the length of the fin.

7. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 1, characterized in that: An air outlet is arranged at the upper end of the shell.

8. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 7, characterized in that: It also includes a demister, which is sleeved on the outside of the cooling pipe and located below the air outlet.

9. The cooling and washing device for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The bottom end of the shell is provided with a liquid outlet.

Images