Hydrogen drying tower of a hydrogen production system

Abstract

The utility model belongs to hydrogen production system technical field, concretely relates to a hydrogen drying tower of hydrogen production system, including tower shell body, the peripheral pipe of from the axial penetration of tower shell body one end extends to its shell, and the heating part that sets up in the peripheral pipe, the heating part is along the axial of the peripheral pipe and presents multistage spiral extension, and the heating power of being located at both ends section is greater than the heating power of being located at the center section, to eliminate the axial temperature difference in drying tower. The utility model discloses through the traditional straight pipe constant power stick is changed into " spiral + segmented power " structure, makes it can improve the heating area, and still can through its multistage power heating to compensate the attenuation of the heat of tower shell body both ends, to realize the uniformity of heating in tower shell body, secondly, through setting up the radial extension of heat conduction net in the peripheral pipe periphery side, can effectively increase the heating area and strengthen radial heat conduction, improve catalyst utilization rate and regenerability.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydrogen production systems, and specifically relates to a hydrogen drying tower for a hydrogen production system. Background Technology

[0002] In a water electrolysis hydrogen production system, the hydrogen discharged from the electrolyzer often contains moisture and trace amounts of oxygen. In order to remove the moisture and oxygen from the hydrogen, a gas drying system is always installed at the hydrogen outlet of the electrolyzer to remove the moisture and oxygen in order to obtain hydrogen of qualified purity.

[0003] Currently, common gas drying systems are drying / deoxygenation towers filled with palladium catalysts, such as... Figure 1 As shown, the interior of this drying / deoxidation tower generally uses a single "straight tube constant power heating rod", namely heating element 3 shown in the figure. Due to the structure of the tower shell, the heat dissipation at both ends of the tower shell is higher than that at the center. This results in a temperature difference in the axial temperature inside the tower shell, which affects the uniformity of heating. That is, when the heating rod is heating, the temperature at the center of the tower shell is higher than that at both ends, which causes uneven heating of the palladium catalyst and affects its lifespan.

[0004] In view of this, the present invention provides a hydrogen drying tower for a hydrogen production system to solve the above problems. Utility Model Content

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydrogen drying tower for a hydrogen production system, comprising a tower shell, an outer peripheral pipe extending axially through one end of the tower shell into its shell, and a heating element disposed within the outer peripheral pipe. The heating element extends in a multi-segment spiral along the axial direction of the outer peripheral pipe, and the heating power at its two ends is greater than the heating power at its center, so as to eliminate the axial temperature difference within the drying tower.

[0006] Preferably, the heating element is an electric heating tube, which includes a first spiral heating section, a second spiral heating section, a third spiral heating section and a fourth spiral heating section connected in series in the direction of extension of the outer tube.

[0007] Preferably, the end of the peripheral pipe that is away from the tower shell extends out of the tower shell, and a heating element mounting flange is formed at its extended end.

[0008] Preferably, the peripheral pipe extending outside the tower shell is provided with an air inlet on its periphery.

[0009] Preferably, an inlet and an outlet that communicate with the interior are respectively provided on the two circumferential sides near the two ends of the tower shell.

[0010] Preferably, temperature sensor 1 and temperature sensor 2, which are connected to the interior of the tower shell, are respectively provided on the periphery of both ends of the tower shell.

[0011] Preferably, an air outlet is provided on the periphery of the end of the tower shell near the air inlet.

[0012] Preferably, the periphery of the outer tube is further connected to at least one set of spaced and radially extending heat-conducting meshes to enhance radial heat conduction.

[0013] Preferably, the mesh density of the heat-conducting mesh is 3mm-10mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model changes the traditional straight tube constant power bar to a "spiral + segmented power" structure, which not only increases the heating area, but also compensates for the heat attenuation at both ends of the tower shell through its multi-segment power heating, thereby achieving uniform heating inside the tower shell;

[0016] 2. By setting the inlet and outlet at the same end near the tower shell, the hydrogen gas needs to travel back and forth once after entering the tower shell before it can be discharged from the outlet. This allows for secondary heating of the hydrogen gas, making full use of thermal energy to improve the heating effect of the hydrogen gas and facilitating the removal of oxygen and moisture.

[0017] 3. This utility model can effectively increase the heating area and enhance radial heat conduction by setting a radially extending heat-conducting mesh on the periphery of the outer tube, thereby improving the utilization rate and regenerability of the catalyst. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of a drying tower structure in the prior art;

[0020] Figure 2 This is a schematic diagram of the drying tower structure of this utility model.

[0021] In the diagram: 1. Tower shell; 11. Feed inlet; 12. Discharge outlet; 13. Temperature sensor one; 14. Temperature sensor two; 2. External pipe; 3. Heating element; 4. Air inlet; 5. Air outlet; 6. Heat-conducting mesh. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1:

[0024] This utility model relates to a hydrogen drying tower for a hydrogen production system, such as... Figure 2 As shown, it includes a tower shell 1 filled with palladium catalyst, an outer tube 2 extending axially through one end of the tower shell 1 into its shell, and a heating element 3 disposed in the outer tube 2.

[0025] The outer tube 2 is a hollow tubular structure with both ends connected. One end of the outer tube extends out of the tower shell 1, and a heating element mounting flange (not marked in the figure) is formed at its extended end. The heating element 3 is an electric heating tube that extends in a multi-segment spiral along the axial direction of the outer tube 2. It is sealed and inserted into the outer tube 2 through the heating element mounting flange to extend into the tower shell 1 to provide heat.

[0026] In this embodiment, the heating element 3 includes a first spiral heating section (not marked in the figure), a second spiral heating section (not marked in the figure), a third spiral heating section (not marked in the figure), and a fourth spiral heating section (not marked in the figure) connected in series along the extension direction of the outer tube 2. The heating power of the second and third spiral heating sections is less than that of the first and fourth spiral heating sections located at their ends, to compensate for the heat loss at both ends of the tower shell 1 and eliminate the axial temperature difference between the two ends inside the drying tower. It should be noted that the number of heating sections in the heating element 3 can be determined according to actual needs, such as a three-section type or other types with more heating sections.

[0027] Specifically, an air inlet 4 is provided around the periphery of the outer pipe 2 extending outside the tower shell 1, and an air outlet 5 is provided around the end of the tower shell 1 near the air inlet 4.

[0028] During operation, hydrogen gas discharged from the electrolytic cell continuously enters the outer tube 2 through the inlet 4 and exits from the end of the outer tube 2 into the interior of the tower shell 1. The operation of the heating element 3 inside the outer tube 2 heats the hydrogen gas inside the outer tube 2, and the temperature inside the entire tower shell 1 rises through heat transfer. During this process, water and oxygen in the hydrogen gas react with the palladium catalyst to generate water vapor, which is discharged from the outlet 5 along with the hydrogen gas into the next heat exchange process. Finally, the water vapor in the hydrogen gas is condensed and liquefied and discharged to obtain hydrogen gas with higher purity.

[0029] Furthermore, an inlet 11 and an outlet 12 are respectively provided on the two sides of the tower shell 1, which are connected to the interior. The palladium catalyst filled inside can be easily replaced by the inlet 11 and the outlet 12.

[0030] Furthermore, temperature sensor 13 and temperature sensor 214, which are connected to the interior of the tower shell 1, are respectively installed on the two sides of the tower shell 1. The temperature inside the tower can be easily detected by the installation of temperature sensor 13 and temperature sensor 214.

[0031] Example 2:

[0032] In order to further improve the heating uniformity in the drying tower, achieve efficient removal of oxygen and moisture, and improve the utilization rate of palladium catalyst, this embodiment provides a heat-conducting mesh 6 based on embodiment one.

[0033] The heat-conducting mesh 6 is fixedly sleeved on the periphery of the outer tube 2 and expands radially inside the tower shell 1. Multiple sets of heat-conducting mesh 6 can be sleeved at intervals on the periphery of the outer tube 2. The specific number of sets can be determined according to the actual length of the outer tube 2, and this application does not limit it.

[0034] In this embodiment, the heat-conducting mesh 6 is woven from interwoven heat-conducting materials, such as stainless steel wire or heat-conducting fiber. In order not to affect the replacement of palladium catalyst, the mesh density of the heat-conducting mesh 6 should be set to 3mm-10mm to facilitate the passage of palladium catalyst.

[0035] During use, the heat from the surface of the outer tube 2 can be quickly and evenly conducted to the palladium catalyst through the heat-conducting mesh 6. At the same time, it can further increase the contact area with hydrogen and palladium catalyst, so as to achieve better drying and dehydration of hydrogen, better heating of palladium catalyst, and evaporation and drainage during the regeneration stage.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydrogen drying tower for a hydrogen production system, comprising a tower shell (1), an outer peripheral pipe (2) extending axially through one end of the tower shell (1) into its interior, and a heating element (3) disposed within the outer peripheral pipe (2), characterized in that: The heating element (3) extends in a multi-segment spiral along the axial direction of the outer tube (2), and the heating power at both ends is greater than that at the center, so as to eliminate the axial temperature difference in the drying tower.

2. The hydrogen drying tower of the hydrogen production system according to claim 1, characterized in that: The heating element (3) is an electric heating tube, which includes a first spiral heating section, a second spiral heating section, a third spiral heating section and a fourth spiral heating section connected in series in the direction of extension of the outer tube (2).

3. The hydrogen drying tower of the hydrogen production system according to claim 1, characterized in that: The outer pipe (2) extends out of the tower shell (1) at one end away from the tower shell (1), and a heating element mounting flange is formed at its extended end.

4. The hydrogen drying tower of the hydrogen production system according to claim 3, characterized in that: An air inlet (4) is provided around the periphery of the outer pipe (2) extending out of the tower shell (1).

5. The hydrogen drying tower of the hydrogen production system according to claim 1, characterized in that: A feed inlet (11) and a discharge outlet (12) that connect to the interior are respectively provided on both sides of the tower shell (1).

6. The hydrogen drying tower of the hydrogen production system according to claim 1, characterized in that: Temperature sensor 1 (13) and temperature sensor 2 (14) connected to the interior are respectively provided on both sides of the tower shell (1).

7. The hydrogen drying tower of the hydrogen production system according to claim 4, characterized in that: An air outlet (5) is provided on the periphery of the end of the tower shell (1) near the air inlet (4).

8. The hydrogen drying tower of the hydrogen production system according to any one of claims 1-7, characterized in that: The periphery of the outer tube (2) is also connected to at least one set of spaced and radially extended heat-conducting meshes (6) to enhance radial heat conduction.

9. The hydrogen drying tower of the hydrogen production system according to claim 8, characterized in that: The mesh density of the heat-conducting mesh (6) is 3mm-10mm.

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