Hydrogen purification system and hydrogen production equipment

Abstract

The utility model discloses a hydrogen purification system and hydrogen production equipment. The hydrogen purification system comprises a first tower body, a second tower body and a third tower body, a raw material inlet is formed in the first main flow path, and the first tower body, the second tower body and the third tower body are selectively communicated with the first main flow path; a finished product outlet is formed in the second main flow path, and the first tower body, the second tower body and the third tower body are selectively communicated with the second main flow path; and the first tower body, the second tower body and the third tower body selectively communicate with the heat exchange flow path, and the heat exchange flow path is used for exchanging heat with the first main flow path or exchanging heat with the second main flow path. Therefore, according to the hydrogen purification system disclosed by the utility model, heat loss can be avoided through heat exchange between the heat exchange flow path and the first main flow path or heat exchange between the heat exchange flow path and the second main flow path, so that the power consumption of the hydrogen purification system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production, in particular to a hydrogen purification system and hydrogen production equipment with the hydrogen purification system. Background Art

[0002] In the related art, a large amount of heat loss occurs during the operation of the existing hydrogen purification system, which results in high power consumption of the existing hydrogen purification system. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a hydrogen purification system to avoid heat loss and reduce the power consumption of the hydrogen purification system.

[0004] The hydrogen purification system according to the utility model comprises:

[0005] The first tower body, the second tower body and the third tower body;

[0006] A first main flow path is formed with a raw material inlet, and the first tower body, the second tower body and the third tower body are selectively connected to the first main flow path;

[0007] A second main flow path is formed with a finished product outlet, and the first tower body, the second tower body and the third tower body are selectively connected to the second main flow path;

[0008] The heat exchange flow path, the first tower body, the second tower body and the third tower body are selectively connected to the heat exchange flow path, the heat exchange flow path is used to exchange heat with the first main flow path, or the heat exchange flow path is used to exchange heat with the second main flow path.

[0009] According to the hydrogen purification system of the utility model, heat loss can be avoided by exchanging heat between the heat exchange flow path and the first main flow path or the second main flow path, so as to reduce the power consumption of the hydrogen purification system.

[0010] In some examples of the present invention, the hydrogen purification system further includes: at least one heat exchanger, and the heat exchange flow path exchanges heat with the first main flow path or the second main flow path through the heat exchanger.

[0011] In some examples of the present invention, the heat exchanger includes a first heat exchange channel and a second heat exchange channel, the first heat exchange channel is configured as part of the heat exchange flow path, and the second heat exchange channel is configured as part of the first main flow path or part of the heat exchange of the second main flow path.

[0012] In some examples of the present invention, both ends of the heat exchange flow path are selectively connected to the first tower body, the second tower body, and the second tower body.

[0013] In some examples of the present invention, the heat exchange flow path includes a first sub-heat exchange flow path and a second sub-heat exchange flow path, the first heat exchange flow path connects the first sub-heat exchange flow path and the second sub-heat exchange flow path, and one end of the first sub-heat exchange flow path away from the first heat exchange flow path and one end of the second sub-heat exchange flow path away from the first heat exchange flow path are selectively connected to the first tower body, the second tower body and the third tower body.

[0014] In some examples of the present invention, the hydrogen purification system further includes: a three-way valve having a first valve port, a second valve port, and a third valve port;

[0015] The first sub-heat exchange flow path includes sub-heat exchange flow segment 1 and sub-heat exchange flow segment 2, one end of sub-heat exchange flow segment 1 is selectively connected to the first tower body, the second tower body and the third tower body, the other end of sub-heat exchange flow segment 1 is connected to the first valve port, one end of sub-heat exchange flow segment 2 is connected to the second valve port, the other end of sub-heat exchange flow segment 2 is connected to the first heat exchange flow channel, and the third valve port is connected to the second sub-heat exchange flow path.

[0016] In some examples of the present invention, the hydrogen purification system also includes: a heater, which is arranged in the second sub-heat exchange flow path, the heater has a first port and a second port that are connected, the first heat exchange flow path is connected to the first port and the second valve port, and the second port is selectively connected to the first tower body, the second tower body and the third tower body.

[0017] In some examples of the present invention, the hydrogen purification system also includes: a third main flow path, both ends of which are selectively connected to the first tower body, the second tower body and the third tower body, and the third main flow path has a heat exchange device and a gas-liquid separator connected in series.

[0018] In some examples of the present invention, there are multiple heat exchangers, and the multiple heat exchangers include a first heat exchanger, a second heat exchanger, and a third heat exchanger;

[0019] The heat exchange flow path includes a connecting main path, one end of which selectively connects to the first branch, the second branch and the third branch, and the other end of which selectively connects to the fourth branch, the fifth branch and the sixth branch;

[0020] The first heat exchange flow channel of the first heat exchanger is configured as part of the first branch, and the first branch and the fourth branch are both selectively connected to the first tower body;

[0021] The first heat exchange flow channel of the second heat exchanger is configured as part of the second branch, and the second branch and the fifth branch are both selectively connected to the second tower body;

[0022] The first heat exchange flow channel of the third heat exchanger is configured as part of the third branch, and the third branch and the sixth branch are both selectively connected to the third tower body.

[0023] In some examples of the present invention, a hydrogen purification system includes a plurality of three-way valves, each of which has a first valve port, a second valve port, and a third valve port;

[0024] The second main flow path includes multiple sub-branch one and multiple sub-branch two, multiple three-way valves, multiple sub-branch one and multiple sub-branch two are connected one by one, multiple first valve ports are selectively connected to the finished product outlet, sub-branch one is connected between the corresponding second valve port and the second heat exchange channel of the corresponding heat exchanger, and sub-branch two is connected between the corresponding third valve port and the corresponding tower body.

[0025] In some examples of the present invention, the main communication path has a heat exchange device and a gas-liquid separator connected in series.

[0026] The hydrogen production equipment according to the utility model comprises the above-mentioned hydrogen purification system.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a structural schematic diagram of a hydrogen purification system according to a first embodiment of the utility model;

[0030] Figure 2 is a schematic structural diagram of a first main flow path according to a first embodiment of the utility model;

[0031] Figure 3 is a schematic structural diagram of the second main flow path according to the first embodiment of the utility model;

[0032] Figure 4 It is a schematic structural diagram of a heat exchange flow path according to a first embodiment of the utility model;

[0033] Figure 5 is a schematic structural diagram of the third main flow path according to the first embodiment of the utility model;

[0034] Figure 6 is a structural schematic diagram of a hydrogen purification system according to a second embodiment of the utility model;

[0035] Figure 7 is a schematic structural diagram of a first main flow path according to a second embodiment of the utility model;

[0036] Figure 8 is a schematic structural diagram of a second main flow path according to a second embodiment of the utility model;

[0037] Fig. 9 is a schematic structural diagram of a heat exchange flow path according to a second embodiment of the utility model;

[0038] Fig.10 is a schematic structural diagram of a third main flow path according to a second embodiment of the utility model;

[0039] Fig.11 is a structural schematic diagram of a hydrogen purification system according to a third embodiment of the utility model;

[0040] Fig.12 is a schematic structural diagram of a first main flow path according to a third embodiment of the utility model;

[0041] Fig.13 is a schematic structural diagram of a second main flow path according to a third embodiment of the utility model;

[0042] Fig.14 It is a schematic structural diagram of a heat exchange flow path according to a third embodiment of the utility model.

[0043] Reference numerals:

[0044] Hydrogen purification system 100;

[0045] The first tower body 1a; the second tower body 1b; the third tower body 1c;

[0046] First main flow path 1; raw material inlet 10;

[0047] Second main flow path 2; finished product outlet 20;

[0048] Converging flow path 211;

[0049] Sub-branch 1 201; first sub-branch 1 201a; second sub-branch 1 201b; third sub-branch 1 201c;

[0050] Sub-branch 2 202; first sub-branch 2 202a; second sub-branch 2 202b; third sub-branch 2 202c;

[0051] Heat exchange flow path 3;

[0052] The first sub-heat exchange flow path 31; the sub-heat exchange flow section 1 31a; the sub-heat exchange flow section 2 31b;

[0053] The second sub-heat exchange flow path 32 is connected to the main flow path 33;

[0054] The first branch 33a; the second branch 33b; the third branch 33c;

[0055] The fourth branch 33d; the fifth branch 33e; the sixth branch 33f;

[0056] Heat exchanger 4; first heat exchanger 41; second heat exchanger 42; third heat exchanger 43;

[0057] Three-way valve 5; first valve port 5a; second valve port 5b; third valve port 5c;

[0058] A first three-way valve 51; a second three-way valve 52; a third three-way valve 53;

[0059] Heating device 60; heater 6; first port 6a; second port 6b;

[0060] The third main stream 7;

[0061] Heat exchange device 8; gas-liquid separator 9; deoxidation device 111; heat exchange device 112; separation device 113. DETAILED DESCRIPTION

[0062] The embodiments of the present invention 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 having 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 invention, and cannot be understood as limiting the present invention.

[0063] Reference below Figure 1-Figure 14 A hydrogen purification system 100 according to an embodiment of the present invention is described. The hydrogen purification system 100 can be applied to a hydrogen production device to enable the hydrogen production device to produce higher purity hydrogen.

[0064] Combination Figure 1 , Figure 6 and Fig.11 As shown, the hydrogen purification system 100 according to an embodiment of the utility model includes a first tower body 1a, a second tower body 1b, a third tower body 1c, a first main flow path 1, a second main flow path 2 and a heat exchange flow path 3. The first main flow path 1 is formed with a raw material inlet 10, and the first tower body 1a, the second tower body 1b and the third tower body 1c are selectively connected to the first main flow path 1. The second main flow path 2 is formed with a finished product outlet 20, and the first tower body 1a, the second tower body 1b and the third tower body 1c are selectively connected to the second main flow path 2. The first tower body 1a, the second tower body 1b and the third tower body 1c are selectively connected to the heat exchange flow path 3. The heat exchange flow path 3 is used to exchange heat with the first main flow path 1, or the heat exchange flow path 3 is used to exchange heat with the second main flow path 2.

[0065] Combination Figure 1 , Figure 6 and Fig.11As shown, in some embodiments of the utility model, the hydrogen purification system 100 is applied to a hydrogen production equipment as an example for explanation. The hydrogen purification system 100 is suitable for being connected to a crude hydrogen production system of the hydrogen production equipment. The crude hydrogen production system is used to electrolyze water to produce crude hydrogen. The raw material inlet 10 is suitable for being connected to a crude hydrogen outlet of the crude hydrogen production system, so that the crude hydrogen generated by the crude hydrogen production system flows into the hydrogen purification system 100 through the raw material inlet 10. The hydrogen purification system 100 purifies the crude hydrogen to generate high-purity hydrogen, thereby improving the hydrogen production quality of the hydrogen production equipment.

[0066] During the operation of the hydrogen purification system 100, the first tower body 1a, the second tower body 1b and the third tower body 1c can be switched according to the adsorption, regeneration and secondary adsorption cycles. For example, in the first working mode, when the first tower body 1a is in adsorption, the second tower body 1b is in regeneration, and the third tower body 1c is in secondary adsorption. After the first working mode is completed, it is switched to the second working mode. In the second working mode, the first tower body 1a is in secondary adsorption, the second tower body 1b is in adsorption, and the third tower body 1c is in regeneration. After the second working mode is completed, it is switched to the third working mode. In the third working mode, the first tower body 1a is in regeneration, the second tower body 1b is in secondary adsorption, and the third tower body 1c is in adsorption. For the convenience of explanation, combined with Figure 1 , Figure 6 and Fig.11 As shown, in some embodiments of the present invention, the hydrogen purification system 100 is described by taking the operation in the first operation mode as an example.

[0067] Combination Figure 2 , Figure 7 and Fig.12 As shown, in some embodiments of the present invention, the hydrogen purification system 100 further includes a deoxygenation device 111, a heat exchange device 112 and a separation device 113, wherein the deoxygenation device 111, the heat exchange device 112 and the separation device 113 are all arranged in the first main flow path 1 and close to the raw material inlet 10, wherein the heat exchange device 112 is arranged between the deoxygenation device 111 and the separation device 113, the heat exchange device 112 is arranged close to the raw material inlet 10, and the separation device 113 is arranged away from the raw material inlet 10.

[0068] Combination Figure 1 and Figure 2 , Figure 6 and Figure 7 , Fig.11 and Fig.12As shown, in the process of crude hydrogen flowing into the first main flow path 1 through the raw material inlet 10 and flowing to the first tower body 1a, the crude hydrogen flows through the deoxidation device 111, the heat exchange device 112 and the separation device 113 in sequence. The deoxidation device 111 is used to remove the oxygen contained in the crude hydrogen to improve the purity of the hydrogen. It should be noted that in the process of the deoxidation device 111 deoxygenating the crude hydrogen, the deoxidation device 111 needs to heat the crude hydrogen to achieve the effect of eliminating oxygen. Therefore, the crude hydrogen discharged from the deoxidation device 111 has a relatively high temperature. In some embodiments, the temperature of the crude hydrogen discharged from the deoxidation device 111 is between 100 and 130°C.

[0069] After being deoxygenated by the deoxygenation device 111, the crude hydrogen flows through the heat exchange device 112 and the separation device 113 in sequence. The heat exchange device 112 is used to reduce the temperature of the crude hydrogen so that most of the water contained in the crude hydrogen can be liquefied, so that the separation device 113 can be used to separate the hydrogen and water in the crude hydrogen, further improve the purity of the crude hydrogen, and reduce the water content in the crude hydrogen.

[0070] After the crude hydrogen is discharged from the separation device 113, it flows into the first tower body 1a. The molecular sieve and other fillers in the first tower body 1a are used to absorb the moisture in the crude hydrogen. Molecular sieve is a kind of aluminosilicate compound with a cubic lattice. The molecular sieve has a uniform microporous structure. The diameter of its holes is uniform. These holes can adsorb molecules smaller than its diameter into the inside of the pore cavity, and have a preferential adsorption capacity for polar molecules and unsaturated molecules, so it can separate molecules with different polarity, different saturation, different molecular sizes and different boiling points, that is, it has the function of "sieving" molecules, so it is called molecular sieve. Molecular sieve has a very strong moisture absorption capacity (therefore it is widely used as a desiccant) and is used for gas purification. The moisture absorbed by the molecular sieve can be eliminated by heating before use to achieve the regeneration of the molecular sieve.

[0071] The crude hydrogen is purified by the first tower body 1a to generate finished hydrogen. In some embodiments, the Figure 3 and Figure 4 , Figure 8 and Fig. 9 As shown, part of the finished hydrogen is discharged from the finished product outlet 20 through the second main flow path 2, and another part of the finished hydrogen flows into the second tower body 1b through the heat exchange flow path 3. In other embodiments, combined with Fig.13 and Fig.14 As shown, part of the finished hydrogen is discharged from the finished product outlet 20 through the second main flow path 2, and another part of the finished hydrogen flows into the second tower body 1b through the second main flow path 2.

[0072] In some embodiments, in combination Figure 2 and Figure 4 , Figure 7 and Fig. 9As shown, the heat exchange flow path 3 exchanges heat with the first main flow path 1, wherein the area where the heat exchange flow path 3 exchanges heat with the first main flow path 1 is located between the deoxidation device 111 and the heat exchange device 112. According to some of the above embodiments, the crude hydrogen discharged from the deoxidation device 111 has a relatively high temperature. Therefore, the finished hydrogen in the heat exchange flow path 3 can absorb the heat of the crude hydrogen in the first main flow path 1 to increase the temperature of the finished hydrogen in the heat exchange flow path 3, so that the temperature of the finished hydrogen flowing into the second tower body 1b through the heat exchange flow path 3 is in a high temperature state.

[0073] During the operation of the second tower body 1b, it is necessary to increase the temperature inside the second tower body 1b to eliminate the moisture previously adsorbed by the molecular sieve and achieve the regeneration effect of the molecular sieve. In some embodiments, the hydrogen purification system 100 uses a heating device 60 to increase the temperature inside the second tower body 1b to regenerate the molecular sieve.

[0074] The finished hydrogen exchanges heat with the first main flow path 1 and flows into the second tower body 1b during the process of flowing through the heat exchange flow path 3. Since the temperature of the finished hydrogen flowing into the second tower body 1b is at a high temperature, the temperature of the molecular sieve in the second tower body 1b is heated by the temperature of the finished hydrogen during the process of flowing through the second tower body 1b, thereby reducing the power of the heating device 60. Therefore, according to the hydrogen purification system 100 of the embodiment of the utility model, the heat exchange flow path 3 is used to exchange heat with the first main flow path 1, which can avoid heat loss and reduce the power consumption of the hydrogen purification system 100.

[0075] When the finished hydrogen flows through the second tower body 1b, the moisture previously adsorbed by the molecular sieve is brought out, so that the finished hydrogen forms secondary crude hydrogen after flowing through the second tower body 1b. The secondary crude hydrogen is discharged from the second tower body 1b and flows into the third tower body 1c. The third tower body 1c performs adsorption treatment on the secondary crude hydrogen to purify the secondary crude hydrogen to form finished hydrogen. After that, the finished hydrogen is discharged from the third tower body 1c and flows along the second main flow path 2 to the finished product outlet 20.

[0076] In some embodiments, in combination Fig.13 and Fig.14 As shown, the heat exchange flow path 3 exchanges heat with the second main flow path 2, and part of the finished hydrogen discharged from the first tower body 1a flows into the second tower body 1b through the second main flow path 2. When the second tower body 1b is regenerated, the hydrogen purification system 100 uses a heating device 60 to increase the temperature in the second tower body 1b, so that the molecular sieve is regenerated. Secondary crude hydrogen is formed in the process of the finished hydrogen flowing through the second tower body 1b. After the secondary crude hydrogen is discharged from the second tower body 1b, it flows into the third tower body 1c along the heat exchange flow path 3. The third tower body 1c adsorbs the secondary crude hydrogen to purify the secondary crude hydrogen to form finished hydrogen. Then the finished hydrogen is discharged from the third tower body 1c and flows to the finished product outlet 20 along the second main flow path 2.

[0077] Since the temperature of the finished hydrogen flowing into the second tower body 1b along the second main flow path 2 is lower than the temperature of the secondary crude hydrogen discharged from the second tower body 1b, the finished hydrogen exchanges heat with the secondary crude hydrogen discharged from the second tower body 1b before flowing into the second tower body 1b along the second main flow path 2, thereby increasing the temperature of the finished hydrogen flowing into the second tower body 1b, and using the temperature of the finished hydrogen to heat the temperature of the molecular sieve in the second tower body 1b, thereby reducing the power of the heating device 60. Therefore, according to the hydrogen purification system 100 of the embodiment of the utility model, heat exchange between the heat exchange flow path 3 and the second main flow path 2 can be used to avoid heat loss, thereby reducing the power consumption of the hydrogen purification system 100.

[0078] Therefore, in summary of the above embodiments, the hydrogen purification system 100 according to the embodiment of the utility model can avoid heat loss by exchanging heat between the heat exchange flow path 3 and the first main flow path 1 or the second main flow path 2, so as to reduce the power consumption of the hydrogen purification system 100.

[0079] In some embodiments of the present invention, Figure 1 , Figure 6 and Fig.11 As shown, the hydrogen purification system 100 further includes at least one heat exchanger 4, such as Figure 1 and Figure 6 As shown, the hydrogen purification system 100 has a heat exchanger 4, such as Fig.11 As shown, the hydrogen purification system 100 has three heat exchangers 4, so that during the operation of the hydrogen purification system 100, the first tower body 1a, the second tower body 1b and the third tower body 1c can be switched according to the adsorption, regeneration and secondary adsorption cycles.

[0080] In some embodiments of the present invention, Figure 1 , Figure 6 and Fig.11 As shown, the heat exchange flow path 3 exchanges heat with the first main flow path 1 or the second main flow path 2 through the heat exchanger 4. The heat exchanger 4 includes a first heat exchange flow path and a second heat exchange flow path. The first heat exchange flow path is constructed as a part of the heat exchange flow path 3, and the second heat exchange flow path is constructed as a part of the first main flow path 1 or the part of the second main flow path 2 for heat exchange.

[0081] Combination Figure 2 and Figure 3 , Figure 7 and Fig. 9 As shown, the first heat exchange flow channel of the heat exchanger 4 is configured as part of the heat exchange flow path 3, and the second heat exchange flow channel of the heat exchanger 4 is configured as part of the first main flow path 1, wherein as Figure 2 and Figure 7 As shown, the second heat exchange flow channel is located between the deoxidation device 111 and the heat exchange device 112. The crude hydrogen discharged from the deoxidation device 111 is used to heat the finished hydrogen flowing into the second tower body 1b along the heat exchange flow path 3 to avoid heat loss and reduce the power consumption of the hydrogen purification system 100.

[0082] Combination Fig.13 and Fig.14 As shown, the first heat exchange flow channel of the heat exchanger 4 is configured as part of the heat exchange flow path 3, and the second heat exchange flow channel of the heat exchanger 4 is configured as part of the second main flow path 2, so that the secondary crude hydrogen flowing from the second tower body 1b to the third tower body 1c along the heat exchange flow path 3 is heat-exchanged with the finished hydrogen flowing from the first tower body 1a to the second tower body 1b along the second main flow path 2, thereby avoiding heat loss and reducing the power consumption of the hydrogen purification system 100.

[0083] In some embodiments of the present invention, Figure 4 , Fig. 9 and Fig.14 As shown, both ends of the heat exchange flow path 3 are selectively connected to the first tower body 1a, the second tower body 1b, and the second tower body 1b.

[0084] In some embodiments, Figure 4 and Fig. 9 As shown, when the hydrogen purification system 100 is in the first working mode, part of the finished hydrogen discharged from the first tower body 1a flows into the second tower body 1b along the heat exchange flow path 3; when the hydrogen purification system 100 is in the second working mode, part of the finished hydrogen discharged from the second tower body 1b flows into the third tower body 1c along the heat exchange flow path 3; when the hydrogen purification system 100 is in the third working mode, part of the finished hydrogen discharged from the third tower body 1c flows into the first tower body 1a along the heat exchange flow path 3.

[0085] In some embodiments, in combination Fig. 9 As shown, when the hydrogen purification system 100 is in the first working mode, the secondary crude hydrogen discharged from the second tower body 1b flows into the third tower body 1c along the heat exchange flow path 3; when the hydrogen purification system 100 is in the second working mode, the secondary crude hydrogen discharged from the third tower body 1c flows into the first tower body 1a along the heat exchange flow path 3; when the hydrogen purification system 100 is in the third working mode, the secondary crude hydrogen discharged from the first tower body 1a flows into the second tower body 1b along the heat exchange flow path 3.

[0086] Therefore, according to the heat exchange flow path 3 of the embodiment of the utility model, the first tower body 1a, the second tower body 1b and the third tower body 1c can be switched according to the adsorption, regeneration and secondary adsorption cycles, and the heat exchange flow path 3 can be ensured to exchange heat with the first main flow path 1 or the second main flow path 2 in the first working mode, the second working mode and the third working mode of the hydrogen purification system 100.

[0087] In some embodiments of the present invention, Figure 4 and Fig. 9As shown, the heat exchange flow path 3 includes a first sub-heat exchange flow path 31 and a second sub-heat exchange flow path 32, the first heat exchange flow path connects the first sub-heat exchange flow path 31 and the second sub-heat exchange flow path 32, and an end of the first sub-heat exchange flow path 31 away from the first heat exchange flow path and an end of the second sub-heat exchange flow path 32 away from the first heat exchange flow path are selectively connected to the first tower body 1a, the second tower body 1b and the third tower body 1c.

[0088] In some embodiments, Figure 4 and Fig. 9 As shown, the first sub-heat exchange flow path 31 and the second sub-heat exchange flow path 32 are respectively connected to the two ends of the first heat exchange flow channel of the heat exchanger 4, for example, in combination with Figure 1 and Figure 4 , Figure 6 and Fig. 9 As shown, when the hydrogen purification system 100 is in the first working mode, part of the finished hydrogen discharged from the first tower body 1a flows along the first sub-heat exchange flow path 31 to the first heat exchange flow channel, so that the finished hydrogen exchanges heat with the crude hydrogen in the second heat exchange flow channel to increase the temperature of the finished hydrogen in the heat exchange flow path 3, and then the finished hydrogen flowing through the first heat exchange flow channel flows into the second sub-heat exchange flow path 32, and flows into the second tower body 1b along the second sub-heat exchange flow path 32.

[0089] In some embodiments of the present invention, Figure 1 and Figure 4 , Figure 6 and Fig. 9 As shown, the hydrogen purification system 100 further includes a three-way valve 5, which has a first valve port 5a, a second valve port 5b and a third valve port 5c. The first sub-heat exchange flow path 31 includes a sub-heat exchange flow segment 1 31a and a sub-heat exchange flow segment 2 31b, one end of the sub-heat exchange flow segment 1 31a is selectively connected to the first tower body 1a, the second tower body 1b and the third tower body 1c, the other end of the sub-heat exchange flow segment 1 31a is connected to the first valve port 5a, one end of the sub-heat exchange flow segment 2 31b is connected to the second valve port 5b, the other end of the sub-heat exchange flow segment 2 31b is connected to the first heat exchange flow channel, and the third valve port 5c is connected to the second sub-heat exchange flow path 32.

[0090] In some embodiments, in combination Figure 1 and Figure 4 , Figure 6 and Fig. 9As shown, the second tower body 1b is regenerated in the first working mode, and in the next mode (i.e., the second working mode), the second tower body 1b is adsorbed. Since the temperature of the molecular sieve in the second tower body 1b must be kept at a low temperature when the second tower body 1b is adsorbed, the molecular sieve in the second tower body 1b must be cooled before switching from the first working mode to the second working mode. Therefore, by setting a three-way valve 5, the second tower body 1b is purged with the finished hydrogen with a lower temperature discharged from the first tower body 1a, so as to achieve the effect of cooling the molecular sieve in the second tower body 1b.

[0091] In some embodiments, in combination Figure 1 and Figure 4 , Figure 6 and Fig. 9 As shown, in the heat exchange mode of the first working mode, the first valve port 5a and the second valve port 5b of the three-way valve 5 are in a connected state, and the first valve port 5a and the third valve port 5c are in a disconnected state, thereby, the finished hydrogen discharged from the first tower body 1a flows into the three-way valve 5 along the sub-heat exchange flow segment 1 31a, and then the finished hydrogen is discharged from the three-way valve 5 through the second valve port 5b and flows into the sub-heat exchange flow segment 2 31b, that is, the first sub-heat exchange flow path 31 is in a fully conductive state, and the finished hydrogen flows through the heat exchanger 4 during the process of flowing from the first sub-heat exchange flow path 31 to the second sub-heat exchange flow path 32, so that the finished hydrogen in the heat exchange flow path 3 exchanges heat with the crude hydrogen in the first main flow path 1, so as to increase the temperature of the finished hydrogen in the heat exchange flow path 3, and use the temperature of the finished hydrogen to heat the temperature of the molecular sieve in the second tower body 1b, thereby reducing the power of the heating device 60, avoiding heat loss of the hydrogen purification system 100 and reducing the power consumption of the hydrogen purification system 100.

[0092] Combination Figure 1 and Figure 4 , Figure 6 and Fig. 9 As shown, in the purge mode of the first working mode, the first valve port 5a and the second valve port 5b of the three-way valve 5 are in a disconnected state, and the first valve port 5a and the third valve port 5c are in a connected state, so that the sub-heat exchange flow segment 1 31a is disconnected from the sub-heat exchange flow segment 2 31b, that is, the first sub-heat exchange flow path 31 is in an incompletely connected state, thereby preventing the finished hydrogen from flowing through the heat exchanger 4 and exchanging heat with the first main flow path 1, thereby ensuring that the finished hydrogen flowing into the second tower body 1b along the heat exchange flow path 3 is in a low-temperature state.

[0093] During the flow of the finished hydrogen along the heat exchange path 3, the first valve port 5a is connected with the third valve port 5c, so that the sub-heat exchange flow section 1 31a is connected with the second sub-heat exchange path 32. After the finished hydrogen is discharged from the third valve port 5c of the three-way valve 5, it flows into the second tower body 1b along the second sub-heat exchange path 32, so that the low-temperature finished hydrogen purges the inside of the second tower body 1b, thereby reducing the temperature inside the second tower body 1b to a suitable temperature, so that the second tower body 1b can be adsorbed in the second working mode.

[0094] Therefore, according to the hydrogen purification system 100 of the embodiment of the utility model, by providing the three-way valve 5, the first working mode has not only the heat exchange mode but also the purge mode, so that before the hydrogen purification system 100 switches to the second working mode, the purge mode of the first working mode is used to quickly reduce the temperature in the second tower body 1b to a suitable temperature, so that the hydrogen purification system 100 can quickly switch from the first working mode to the second working mode, thereby improving the working efficiency of the hydrogen purification system 100, and because part of the finished hydrogen discharged from the first tower body 1a is used to cool the molecular sieve in the second tower body 1b, there is no need to additionally set up a cooling device for cooling the molecular sieve in the second tower body 1b, thereby reducing the number of devices of the hydrogen purification system 100 and reducing the cost of the hydrogen purification system 100.

[0095] It should be noted that in some of the above embodiments, the heat exchange mode and the purge mode are explained only in the first working mode, but the present invention is not limited to this. The second working mode and the third working mode both have corresponding heat exchange mode and purge mode, which will not be repeated here.

[0096] In some embodiments of the present invention, Figure 6 and Fig. 9 As shown, the hydrogen purification system 100 may further include a heater 6, which may be the heating device 60 mentioned in some of the above embodiments. The heater 6 is arranged in the second sub-heat exchange flow path 32, and the heater 6 has a first port 6a and a second port 6b that are connected. The first heat exchange flow path is connected to the first port 6a and the second valve port 5b, and the second port 6b is selectively connected to the first tower body 1a, the second tower body 1b and the third tower body 1c.

[0097] In some embodiments, in combination Figure 6 and Fig. 9 As shown, when the hydrogen purification system 100 is in the heat exchange mode of the first working mode, the finished hydrogen flows through the first heat exchange channel of the heat exchanger 4 along the heat exchange channel 3, and the finished hydrogen flowing through the first heat exchange channel exchanges heat with the crude hydrogen flowing through the first heat exchange channel to increase the temperature of the finished hydrogen, and then the finished hydrogen flows to the heater 6 along the second sub-heat exchange channel 32, and the finished hydrogen flows into the heater 6 from the first port 6a, and the heater 6 works to heat the finished hydrogen in the heater 6, so that the temperature of the finished hydrogen in the heater 6 is further increased, and the finished hydrogen is discharged from the heater 6 from the second port 6b after secondary heating by the heater 6, and then the finished hydrogen flows into the second tower body 1b through the second sub-heat exchange channel 32, and the second tower body 1b is heated by the high temperature of the finished hydrogen, so as to achieve the effect of regenerating the molecular sieve and other fillers in the second tower body 1b.

[0098] In some embodiments, Figure 1 and Fig.11 As shown, the hydrogen purification system 100 may include a plurality of heating devices 60, which are integrated in the corresponding first tower body 1a, the second tower body 1b and the third tower body 1c, so that when the first tower body 1a, the second tower body 1b or the third tower body 1c is regenerated, the corresponding heating devices 60 work to heat the temperature inside the first tower body 1a, the temperature inside the second tower body 1b or the temperature inside the third tower body 1c.

[0099] In some embodiments of the present invention, Figure 1 and Figure 5 , Figure 6 and Fig.10 As shown, the hydrogen purification system 100 may further include a third main flow path 7, both ends of which are selectively connected to the first tower body 1a, the second tower body 1b and the third tower body 1c, and the third main flow path 7 has a heat exchange device 8 and a gas-liquid separator 9 connected in series.

[0100] In some embodiments, in combination Figure 1 and Figure 5 , Figure 6 and Fig.10 As shown, when the hydrogen purification system 100 is in the first working mode, the secondary crude hydrogen discharged from the second tower body 1b flows into the third main flow path 7, and in the process of the secondary crude hydrogen flowing through the third main flow path 7, the secondary crude hydrogen flows through the heat exchange device 8 and the gas-liquid separator 9 arranged in the third main flow path 7 in sequence. The heat exchange device 8 is used to reduce the temperature of the secondary crude hydrogen so that most of the water contained in the secondary crude hydrogen is liquefied, so that the gas-liquid separator 9 can be used to separate the hydrogen and water in the secondary crude hydrogen, further improve the purity of the secondary crude hydrogen, and reduce the water content in the secondary crude hydrogen.

[0101] The secondary crude hydrogen treated by the gas-liquid separator 9 flows into the third tower body 1c along the third main flow path 7, and is adsorbed by the third tower body 1c to form finished hydrogen. After the finished hydrogen is discharged from the third tower body 1c, it flows to the finished product outlet 20 along the second main flow path 2.

[0102] It should be noted that in some of the above embodiments, only the first working mode is used for explanation, but the present invention is not limited to this. The working processes of the second working mode and the third working mode are similar to the first working mode and will not be repeated here.

[0103] In some embodiments of the present invention, Figure 11-Figure 14As shown, the heat exchanger 4 can be multiple, and the multiple heat exchangers 4 include a first heat exchanger 41, a second heat exchanger 42 and a third heat exchanger 43. The heat exchange flow path 3 includes a connecting main path 33, one end of the connecting main path 33 selectively connects the first branch 33a, the second branch 33b and the third branch 33c, and the other end of the connecting main path 33 selectively connects the fourth branch 33d, the fifth branch 33e and the sixth branch 33f. The first heat exchange flow path of the first heat exchanger 41 is configured as a first The first heat exchange channel of the second heat exchanger 42 is configured as part of the second branch 33b, and the second branch 33b and the fifth branch 33e are selectively connected to the second tower body 1b. The first heat exchange channel of the third heat exchanger 43 is configured as part of the third branch 33c, and the third branch 33c and the sixth branch 33f are selectively connected to the third tower body 1c.

[0104] In some embodiments, in combination Fig.11 and Fig.14 As shown, in the first working mode, the secondary crude hydrogen discharged from the second tower body 1b flows into the connecting main path 33 through the second branch 33b, and the secondary crude hydrogen flows through the first heat exchange channel of the second heat exchanger 42 during the process of flowing through the second branch 33b, so that the secondary crude hydrogen exchanges heat with the finished hydrogen that is about to flow into the second tower body 1b, so that the temperature of the finished hydrogen that is about to flow into the second tower body 1b is increased, and then the secondary crude hydrogen flows into the connecting main path 33 and flows to the sixth branch 33f through the connecting main path 33, so that the secondary crude hydrogen flows into the third tower body 1c.

[0105] In some embodiments of the present invention, Fig.11 and Fig.14 As shown, the main communication path 33 has a heat exchange device 8 and a gas-liquid separator 9 connected in series. In the first working mode, during the flow of the secondary crude hydrogen from the second tower body 1b to the third tower body 1c along the heat exchange flow path 3, the secondary crude hydrogen flows through the heat exchange device 8 and the gas-liquid separator 9 in sequence. The heat exchange device 8 is used to reduce the temperature of the secondary crude hydrogen so that most of the water contained in the secondary crude hydrogen is liquefied, so that the gas-liquid separator 9 can be used to separate the hydrogen and water in the secondary crude hydrogen, further improve the purity of the secondary crude hydrogen, and reduce the water content in the secondary crude hydrogen.

[0106] The secondary crude hydrogen treated by the gas-liquid separator 9 flows into the third tower body 1c along the third main flow path 7, and is adsorbed by the third tower body 1c to form finished hydrogen. After the finished hydrogen is discharged from the third tower body 1c, it flows to the finished product outlet 20 along the second main flow path 2.

[0107] It should be noted that in some of the above embodiments, only the first working mode is used for explanation, but the present invention is not limited to this. The working processes of the second working mode and the third working mode are similar to the first working mode and will not be repeated here.

[0108] In some embodiments of the present invention, Fig.11 and Fig.13 As shown, the hydrogen purification system 100 includes a plurality of three-way valves 5, the three-way valves 5 have a first valve port 5a, a second valve port 5b and a third valve port 5c, the second main flow path 2 includes a plurality of sub-branch one 201 and a plurality of sub-branch two 202, the plurality of three-way valves 5, the plurality of sub-branch one 201 and the plurality of sub-branch two 202 are respectively connected in a one-to-one correspondence, the plurality of first valve ports 5a are selectively connected to the finished product outlet 20, the sub-branch one 201 is connected between the corresponding second valve port 5b and the second heat exchange flow channel of the corresponding heat exchanger 4, and the sub-branch two 202 is connected between the corresponding third valve port 5c and the corresponding tower body.

[0109] In some embodiments, in combination Fig.11 and Fig.13 As shown, the multiple three-way valves 5 may include a first three-way valve 51, a second three-way valve 52 and a third three-way valve 53, the multiple sub-branches 201 may include a first sub-branch 201a, a second sub-branch 201b and a third sub-branch 201c, the multiple sub-branch 202 may include a first sub-branch 202a, a second sub-branch 202b and a third sub-branch 202c, the second main flow path 2 may also include a converging flow path 211, one end of the converging flow path 211 is formed with a finished product outlet 20, the other end of the converging flow path 211 is connected to the first valve port 5a of the first three-way valve 51, the first valve port 5a of the second three-way valve 52 and the first valve port 5a of the third three-way valve 53, and the other end of the converging flow path 211 can also be selectively connected to the first tower body 1a, the second tower body 1b and the third tower body 1c respectively.

[0110] like Fig.13 As shown, one end of the first sub-branch 201a is connected to the second valve port 5b of the first three-way valve 51, and the other end of the first sub-branch 201a is connected to the second heat exchange channel of the first heat exchanger 41, so that when the first valve port 5a of the first three-way valve 51 is connected to the second valve port 5b, the converging flow path 211 is connected to the first tower body 1a through the first three-way valve 51 and the first heat exchanger 41.

[0111] like Fig.13As shown, one end of the second sub-branch 201b is connected to the second valve port 5b of the second three-way valve 52, and the other end of the second sub-branch 201b is connected to the second heat exchange channel of the second heat exchanger 42, so that when the first valve port 5a of the second three-way valve 52 is connected to the second valve port 5b thereof, the converging flow path 211 is connected to the second tower body 1b through the second three-way valve 52 and the second heat exchanger 42.

[0112] like Fig.13 As shown, one end of the third sub-branch 201c is connected to the second valve port 5b of the third three-way valve 53, and the other end of the third sub-branch 201c is connected to the second heat exchange channel of the third heat exchanger 43, so that when the first valve port 5a of the third three-way valve 53 is connected to the second valve port 5b thereof, the converging flow path 211 is connected to the third tower body 1c through the third three-way valve 53 and the third heat exchanger 43.

[0113] like Fig.13 As shown, one end of the first sub-branch 202a is connected to the third valve port 5c of the first three-way valve 51, and the other end of the first sub-branch 202a is connected to the second heat exchange channel of the first heat exchanger 41, so that when the first valve port 5a of the first three-way valve 51 is connected to the third valve port 5c thereof, the converging flow path 211 is connected to the first tower body 1a through the first three-way valve 51 to avoid the first heat exchanger 41.

[0114] like Fig.13 As shown, one end of the second sub-branch 202b is connected to the third valve port 5c of the second three-way valve 52, and the other end of the second sub-branch 202b is connected to the second heat exchange channel of the second heat exchanger 42, so that when the first valve port 5a of the second three-way valve 52 is connected to the third valve port 5c thereof, the converging flow path 211 is connected to the second tower body 1b through the second three-way valve 52 to avoid the second heat exchanger 42.

[0115] like Fig.13 As shown, one end of the third sub-branch 202c is connected to the third valve port 5c of the third three-way valve 53, and the other end of the third sub-branch 202c is connected to the second heat exchange channel of the third heat exchanger 43, so that when the first valve port 5a of the third three-way valve 53 is connected to the third valve port 5c thereof, the converging flow path 211 is connected to the third tower body 1c through the third three-way valve 53 to avoid the third heat exchanger 43.

[0116] In some embodiments, Fig.11As shown, the second tower body 1b is regenerated in the first working mode, and in the next mode (i.e., the second working mode), the second tower body 1b is adsorbed. Since the temperature in the second tower body 1b needs to be kept at a low temperature when the second tower body 1b is adsorbed, the molecular sieve in the second tower body 1b needs to be cooled before switching from the first working mode to the second working mode. Therefore, by setting a three-way valve 5, the second tower body 1b is purged with the finished hydrogen with a lower temperature discharged from the first tower body 1a, so as to achieve the effect of cooling the molecular sieve in the second tower body 1b.

[0117] In some embodiments, in combination Figure 11-Figure 14 As shown, the hydrogen purification system 100 is in the first working mode as an example for explanation. During the heat exchange mode operation of the first working mode, the first main flow path 1 is connected to the first tower body 1a, and the first main flow path 1 is not connected to the second tower body 1b and the third tower body 1c, so that the crude hydrogen flows into the first tower body 1a along the first main flow path 1 for purification.

[0118] The first valve port 5a of the first three-way valve 51 is connected with its third valve port 5c, and the first valve port 5a of the first three-way valve 51 is disconnected from its second valve port 5b, so that the pure hydrogen discharged from the first tower body 1a flows along the first sub-branch 2 202a and into the converging flow path 211 through the first three-way valve 51, and then part of the pure hydrogen flows to the finished product outlet 20 through the converging flow path 211, and the other part flows into the second three-way valve 52 along the converging flow path 211.

[0119] At this time, the first valve port 5a of the second three-way valve 52 is connected to its second valve port 5b, and the first valve port 5a of the second three-way valve 52 is disconnected from its third valve port 5c, so that the pure hydrogen flowing from the converging flow path 211 to the second tower body 1b flows through the second sub-branch 201b through the second heat exchange flow channel of the second heat exchanger 42, so that the pure hydrogen flows into the second tower body 1b. In the process of the pure hydrogen flowing through the second heat exchange flow channel of the second heat exchanger 42, the pure hydrogen exchanges heat with the secondary crude hydrogen discharged from the second tower body 1b and flowing through the first heat exchange flow channel of the second heat exchanger 42, so as to increase the temperature of the pure hydrogen, avoid heat loss, and reduce the power consumption of the hydrogen purification system 100.

[0120] Then, the secondary crude hydrogen flows along the second branch 33b of the second sub-heat exchange flow path 32 into the connecting main path 33, and flows into the sixth branch 33f through the connecting main path 33, so that the secondary crude hydrogen flows into the third tower body 1c, and the third tower body 1c purifies the secondary crude hydrogen. In the third three-way valve 53, the first valve port 5a of the third three-way valve 53 is not connected with its second valve port 5b and the third valve port 5c, so that the pure hydrogen discharged from the third tower body 1c flows into the converging flow path 211 and flows to the finished product outlet 20.

[0121] In some embodiments, in combination Figure 11-Figure 14As shown, in the process of switching from the heat exchange mode of the first working mode to the purge mode of the first working mode, the first valve port 5a of the second three-way valve 52 is switched from being connected with its second valve port 5b to being connected with its third valve port 5c, so that the pure hydrogen flowing from the converging flow path 211 to the second tower body 1b flows into the second tower body 1b through the second sub-branch 202b, so as to avoid the pure hydrogen flowing through the second heat exchange flow channel of the second heat exchanger 42, so that the low-temperature pure hydrogen can purge and cool the molecular sieve in the second tower body 1b, so that the temperature of the molecular sieve in the second tower body 1b is reduced to a suitable temperature, so that the second tower body 1b can be adsorbed in the second working mode.

[0122] It should be noted that in some of the above embodiments, only the first working mode is used for explanation, but the present invention is not limited to this. The working processes of the second working mode and the third working mode are similar to the first working mode and will not be repeated here.

[0123] The hydrogen production equipment according to the embodiment of the utility model includes the hydrogen purification system 100 of the above embodiment. In some embodiments, the hydrogen purification system 100 is suitable for connecting with the crude hydrogen production system of the hydrogen production equipment. The crude hydrogen production system is used to electrolyze water to produce crude hydrogen. The raw material inlet 10 is suitable for connecting with the crude hydrogen outlet of the crude hydrogen production system, so that the crude hydrogen generated by the crude hydrogen production system flows into the hydrogen purification system 100 through the raw material inlet 10. The hydrogen purification system 100 purifies the crude hydrogen to generate high-purity hydrogen and improve the hydrogen production quality of the hydrogen production equipment. It should be noted that the features and advantages described above for the hydrogen purification system 100 are also applicable to the hydrogen production equipment and will not be repeated here.

[0124] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0125] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydrogen purification system, characterized in that: include: The first tower body, the second tower body and the third tower body; A first main flow path, wherein the first main flow path is formed with a raw material inlet, and the first tower body, the second tower body and the third tower body are selectively connected to the first main flow path; A second main flow path, wherein the second main flow path is formed with a finished product outlet, and the first tower body, the second tower body and the third tower body are selectively connected to the second main flow path; A heat exchange flow path, wherein the first tower body, the second tower body and the third tower body are selectively connected to the heat exchange flow path, and the heat exchange flow path is used for exchanging heat with the first main flow path, or the heat exchange flow path is used for exchanging heat with the second main flow path.

2. The hydrogen purification system according to claim 1, characterized in that: Also includes: At least one heat exchanger, the heat exchange flow path exchanges heat with the first main flow path or the second main flow path through the heat exchanger.

3. The hydrogen purification system according to claim 2, characterized in that: The heat exchanger includes a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is configured as a part of the heat exchange flow path, and the second heat exchange channel is configured as a part of the first main flow path or a part of the heat exchange of the second main flow path.

4. The hydrogen purification system according to claim 3, characterized in that: Both ends of the heat exchange flow path are selectively connected to the first tower body, the second tower body, and the second tower body.

5. The hydrogen purification system according to claim 4, characterized in that: The heat exchange flow path includes a first sub-heat exchange flow path and a second sub-heat exchange flow path. The first heat exchange flow path connects the first sub-heat exchange flow path and the second sub-heat exchange flow path, and an end of the first sub-heat exchange flow path away from the first heat exchange flow path and an end of the second sub-heat exchange flow path away from the first heat exchange flow path are selectively connected to the first tower body, the second tower body and the third tower body.

6. The hydrogen purification system according to claim 5, characterized in that: Also includes: A three-way valve, the three-way valve having a first valve port, a second valve port and a third valve port; The first sub-heat exchange flow path includes sub-heat exchange flow segment 1 and sub-heat exchange flow segment 2, one end of the sub-heat exchange flow segment 1 is selectively connected to the first tower body, the second tower body and the third tower body, the other end of the sub-heat exchange flow segment 1 is connected to the first valve port, one end of the sub-heat exchange flow segment 2 is connected to the second valve port, the other end of the sub-heat exchange flow segment 2 is connected to the first heat exchange flow channel, and the third valve port is connected to the second sub-heat exchange flow path.

7. The hydrogen purification system according to claim 6, characterized in that: Also includes: A heater is arranged in the second sub-heat exchange flow path, the heater has a first port and a second port that are connected, the first heat exchange flow path is connected to the first port and the second valve port, and the second port is selectively connected to the first tower body, the second tower body and the third tower body.

8. The hydrogen purification system according to claim 4, characterized in that: It also includes: a third main flow path, both ends of which are selectively connected to the first tower body, the second tower body and the third tower body, and the third main flow path has a heat exchange device and a gas-liquid separator connected in series.

9. The hydrogen purification system according to claim 3, characterized in that: There are multiple heat exchangers, and the multiple heat exchangers include a first heat exchanger, a second heat exchanger and a third heat exchanger; The heat exchange flow path includes a connecting main path, one end of which selectively connects the first branch, the second branch and the third branch, and the other end of which selectively connects the fourth branch, the fifth branch and the sixth branch; The first heat exchange flow channel of the first heat exchanger is configured as part of the first branch, and the first branch and the fourth branch are both selectively connected to the first tower body; The first heat exchange flow channel of the second heat exchanger is configured as part of the second branch, and the second branch and the fifth branch are both selectively connected to the second tower body; The first heat exchange channel of the third heat exchanger is configured as a part of the third branch, and the third branch and the sixth branch are both selectively connected to the third tower body.

10. The hydrogen purification system according to claim 9, characterized in that: A plurality of three-way valves are included, each of which has a first valve port, a second valve port and a third valve port; The second main flow path includes multiple sub-branch one and multiple sub-branch two, multiple three-way valves, multiple sub-branch one and multiple sub-branch two are connected one by one, multiple first valve ports are selectively connected to the finished product outlet, the sub-branch one is connected between the corresponding second valve port and the second heat exchange flow channel of the corresponding heat exchanger, and the sub-branch two is connected between the corresponding third valve port and the corresponding tower body.

11. The hydrogen purification system according to claim 9, characterized in that: The main communication path has a heat exchange device and a gas-liquid separator connected in series.

12. A hydrogen production device, characterized in that: A hydrogen purification system comprising the hydrogen purification system according to any one of claims 1 to 11.

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