Hydrogen purification equipment and ammonia production system

Abstract

The utility model discloses hydrogen purification equipment and an ammonia production system, and relates to the technical field of hydrogen purification, and the hydrogen purification equipment comprises an air separation device, a hydrogen production device, a heat exchange part and a filtering part; the air separation device is provided with a refrigerant discharge pipe; the hydrogen production device is provided with a hydrogen discharge pipe; the heat exchange part is provided with a refrigerant inlet end, a hydrogen inlet end and a hydrogen outlet end, the refrigerant discharge pipe is communicated with the refrigerant inlet end, the hydrogen discharge pipe is communicated with the hydrogen inlet end, and a refrigerant discharged by the refrigerant discharge pipe and hydrogen discharged by the hydrogen discharge pipe can be subjected to heat exchange; the filter is provided with an inlet end and an outlet end which are mutually communicated; the inlet end is communicated with the hydrogen outlet end; according to the technical scheme, the utilization rate of hydrogen is increased.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen purification, and in particular to a hydrogen purification device and an ammonia synthesis system. Background Art

[0002] Using produced hydrogen to synthesize ammonia is an important method for consuming hydrogen. The current approach involves using an air separation unit to produce nitrogen and a water electrolysis unit to produce hydrogen. The two are then fed into an ammonia synthesis unit in a 1:3 ratio. However, low hydrogen production levels prevent efficient utilization. Utility Model Content

[0003] The main purpose of this application is to propose a hydrogen purification device and an ammonia production system, aiming to improve the utilization rate of hydrogen.

[0004] To achieve the above-mentioned objectives, the hydrogen purification equipment proposed in the present application includes an air separation unit, a hydrogen production unit, a heat exchange unit and a filter unit; the air separation unit has a refrigerant discharge pipe; the hydrogen production unit has a hydrogen discharge pipe; the heat exchange unit has a refrigerant inlet end, a hydrogen inlet end and a hydrogen outlet end, the refrigerant discharge pipe is connected to the refrigerant inlet end, the hydrogen discharge pipe is connected to the hydrogen inlet end, and can enable the refrigerant discharged from the refrigerant discharge pipe to exchange heat with the hydrogen discharged from the hydrogen discharge pipe; the filter has an inlet end and an outlet end that are connected to each other, and the inlet end is connected to the hydrogen outlet end.

[0005] In one embodiment, the refrigerant discharge pipe includes a liquid nitrogen discharge pipe, and the refrigerant inlet end and the hydrogen inlet end are both connected to the hydrogen outlet end.

[0006] In one embodiment, the refrigerant discharge pipe includes a liquid oxygen discharge pipe, the heat exchange portion includes a refrigerant flow pipe and a hydrogen flow pipe isolated from each other, the refrigerant flow pipe has the refrigerant inlet end, and the hydrogen flow pipe has the hydrogen inlet end and the hydrogen outlet end.

[0007] In one embodiment, the refrigerant discharge pipe is provided with a flow valve.

[0008] In one embodiment, there are at least two hydrogen outlet ports, each of which is connected to the filter;

[0009] And / or, at least two filters are provided, and each filter is connected to at least one hydrogen outlet port.

[0010] In one embodiment, the hydrogen production device includes an electrolysis device, a gas-liquid separator, and a deoxidation device that are connected in sequence, and the deoxidation device has the hydrogen exhaust pipe.

[0011] In one embodiment, the hydrogen purification equipment further includes a temperature swing adsorption drying device, and the temperature swing adsorption drying device is arranged in parallel with the heat exchange part.

[0012] In one embodiment, the hydrogen purification equipment further includes a first control valve, a second control valve, and a control unit. The first control valve is arranged between the deoxygenation device and the heat exchange part, and the second control valve is arranged between the deoxygenation device and the temperature swing adsorption drying device. The first control valve and the second control valve are both electrically connected to the control unit.

[0013] In one embodiment, a flow meter is provided at the rear end of the deoxidation device, and the flow meter is electrically connected to the control unit.

[0014] The present application also proposes an ammonia production system, comprising an ammonia synthesis device and the above-mentioned hydrogen purification equipment, wherein the outlet end of the filter is connected to the ammonia synthesis device.

[0015] The air separation unit in the technical solution of the present application is provided with a refrigerant discharge pipe, the hydrogen production unit has a hydrogen discharge pipe, and the refrigerant connecting pipe is connected to the refrigerant inlet end, and the hydrogen discharge pipe is connected to the hydrogen inlet end, so that the hydrogen with water discharged from the hydrogen production unit and the refrigerant discharged from the air separation unit are heat exchanged in the heat exchange part, so that the refrigerant can cool the hydrogen with water and condense the water into solid ice, thereby facilitating the separation of hydrogen from solid ice. Furthermore, by providing a filter, it is convenient for the filter to filter out the solid ice, and by connecting the hydrogen outlet end to the inlet end of the filter, only the purified hydrogen passes through the inlet of the filter and is discharged from the outlet end of the filter, so that the arrangement is convenient for achieving hydrogen purification efficiency. In addition, such an arrangement makes it unnecessary to regenerate the drying tower during the hydrogen purification process, and there is no need to require the hydrogen production of the hydrogen production unit due to the regeneration of the drying tower, reducing the risk of wasting the hydrogen when the drying tower cannot be regenerated when the hydrogen production is low. The technical solution of the present application has no requirement for the production of hydrogen when the refrigerant and hydrogen are exchanged for heat. The purified hydrogen does not need to be regenerated in a drying tower or discharged, thereby improving the utilization rate of hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the connection structure of an embodiment of the hydrogen purification equipment and the ammonia synthesis device provided in this application;

[0018] Figure 2 This is a schematic diagram of the connection structure of another embodiment of the hydrogen purification equipment and the ammonia synthesis device provided by the present application;

[0019] Figure 3 This is a structural schematic diagram of an embodiment of the hydrogen production equipment provided in this application.

[0020] Description of Figure Numbers:

[0021] 100. Air separation unit; 101. Refrigerant discharge pipe;

[0022] 200, hydrogen production device; 201, hydrogen discharge pipe; 210, electrolysis device; 220, gas-liquid separator; 230, deoxidation device;

[0023] 300, heat exchange part; 301, refrigerant inlet; 302, hydrogen inlet; 303, hydrogen outlet;

[0024] 400, filter; 401, inlet end; 402, outlet end;

[0025] 500. Temperature-swing adsorption drying device;

[0026] 600, first control valve;

[0027] 700, second control valve;

[0028] 800, control unit;

[0029] 900. Ammonia synthesis unit.

[0030] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0032] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0034] Using the produced hydrogen to synthesize ammonia is an important means of consuming hydrogen. The current practice is to use an air separation unit to produce nitrogen, and a water electrolysis unit to produce hydrogen. The two are then fed into the ammonia synthesis unit for a reaction in a ratio of 1:3.

[0035] However, the hydrogen purification unit in a water electrolysis hydrogen production system typically uses a drying tower for purification. After a period of hydrogen purification, the drying tower reaches saturation, requiring some hydrogen to be heated and regenerated. However, when the electrolyzer is under low load, hydrogen production is low. This low-yield hydrogen cannot be regenerated after entering the drying tower, resulting in this hydrogen not being effectively utilized.

[0036] In order to improve the utilization rate of hydrogen, the present application proposes a hydrogen purification device.

[0037] In one embodiment of the present application, Figure 1 or Figure 2 As shown, the hydrogen purification equipment includes an air separation device 100, a hydrogen production device 200, a heat exchange part 300 and a filter part 400; the air separation device 100 has a refrigerant discharge pipe 101; the hydrogen production device 200 has a hydrogen discharge pipe 201; the heat exchange part 300 has a refrigerant inlet end 301, a hydrogen inlet end 302 and a hydrogen outlet end 303, the refrigerant discharge pipe 101 is connected to the refrigerant inlet end 301, the hydrogen discharge pipe 201 is connected to the hydrogen inlet end 302, and can enable the refrigerant discharged from the refrigerant discharge pipe 101 to exchange heat with the hydrogen discharged from the hydrogen discharge pipe 201; the filter 400 has an inlet end 401 and an outlet end 402 that are connected to each other, and the inlet end 401 is connected to the hydrogen outlet end 303.

[0038] The air separation unit 100 is an industrial device used to separate the various gas components in air and produce air components such as oxygen, nitrogen, and argon. The air separation unit 100 has a refrigerant discharge pipe 101, which can be liquid nitrogen or liquid oxygen. The hydrogen production unit 200 has a hydrogen discharge pipe 201, which is used to discharge water-laden hydrogen. The heat exchange section 300 includes a refrigerant inlet 301 and a hydrogen inlet 302. The refrigerant discharge pipe 101 connects to the refrigerant inlet 301, and the hydrogen discharge pipe 201 connects to the hydrogen inlet 302. The refrigerant discharged from the refrigerant discharge pipe 101 and the hydrogen discharged from the hydrogen discharge pipe 201 both enter the heat exchange section 300 and exchange heat within the heat exchange section 300. This converts the water in the hydrogen into solid ice under the cooling effect of the refrigerant, facilitating the separation of the hydrogen from the solid water. Specifically, after the hydrogen with water enters the heat exchange part 300 and the refrigerant enters the heat exchange part 300, they can flow in different pipelines respectively. For example, the refrigerant inlet end 301 and the hydrogen inlet end 302 are independent of each other, and only the hydrogen inlet end 302 is connected to the hydrogen outlet end 303, while the refrigerant inlet end 301 is not connected to the hydrogen inlet end 302 and the hydrogen outlet end 303, so that the hydrogen with water only exchanges heat with the refrigerant, and the hydrogen and the refrigerant will not be mixed, thereby ensuring the purity of the hydrogen. Of course, if the refrigerant is a compound required for subsequent synthesis with hydrogen, for example, when the compound is ammonia and the refrigerant is nitrogen, and the volume ratio of the refrigerant to the hydrogen is 1:3, the flow pipeline in the heat exchange section 300 can also be the same pipeline as the flow pipeline of the hydrogen in the heat exchange section 300, for example, the refrigerant inlet end 301 and the hydrogen inlet end 302 are the same inlet end, or the refrigerant inlet end 301 and the hydrogen inlet end 302 are arranged in parallel, but are both connected to the hydrogen outlet end 303. At this time, the refrigerant and hydrogen are mixed in advance to form the subsequent required compound. The heat exchange section 300 can also have a refrigerant outlet end, which can be connected to a synthesis device that uses the refrigerant to synthesize other mixtures, or connected to another heat exchange device for heat exchange, and circulate into the heat exchange section 300 again after heat exchange in the other heat exchange device.

[0039] Furthermore, by setting up a filter 400, solid ice can be filtered, that is, to block solid water and not allow solid water to pass through the filter 400. In addition, the filter 400 has an inlet end 401 and an outlet end 402 that are interconnected. The inlet end 401 is connected to the hydrogen outlet end 303, so that the filter 400 can allow hydrogen that has been filtered out of water to pass through, thereby achieving a better hydrogen purification effect. In the hydrogen purification process of the technical solution of the present application, since the refrigerant discharge pipe 101 of the air separation unit 100 is constantly discharging refrigerant from the refrigerant discharge pipe 101, it exchanges heat with hydrogen in the heat exchange part 300 to obtain pure hydrogen. There is no risk of consuming energy for regeneration after the hydrogen reaches a protective state after purification for a period of time. In addition, the hydrogen purification process in the technical solution of the present application does not require the hydrogen production of the hydrogen production system, thereby overcoming the problem of discharging this part of hydrogen due to the low hydrogen production and the inability to regenerate the drying tower, thereby improving the utilization rate of hydrogen.

[0040] In the present application, the air separation unit 100 is provided with a refrigerant discharge pipe 101, the hydrogen production unit 200 is provided with a hydrogen discharge pipe 201, and the refrigerant connecting pipe is connected to the refrigerant inlet end 301, and the hydrogen discharge pipe 201 is connected to the hydrogen inlet end 302, thereby allowing the water-containing hydrogen discharged from the hydrogen production unit 200 to exchange heat with the refrigerant discharged from the air separation unit 100 in the heat exchange unit 300, so that the refrigerant can cool the water-containing hydrogen and cause the water to condense into solid ice, thereby facilitating the separation of hydrogen from the solid ice. Furthermore, by providing a filter 400, it is convenient for the filter 400 to filter out the solid ice. By connecting the hydrogen outlet end 303 to the inlet end 401 of the filter 400, only the purified hydrogen passes through the inlet of the filter 400 and is discharged from the outlet end 402 of the filter 400. Such a configuration facilitates achieving hydrogen purification efficiency. Furthermore, this arrangement eliminates the need for drying tower regeneration during the hydrogen purification process, and eliminates any requirement for hydrogen production capacity of the hydrogen production apparatus 200 due to drying tower regeneration. This reduces the risk of wasting hydrogen when the drying tower cannot be regenerated when hydrogen production is low. In this application, there is no requirement for hydrogen production during heat exchange between the refrigerant and hydrogen. Purified hydrogen does not need to be regenerated in the drying tower or discharged, thereby improving hydrogen utilization.

[0041] In one embodiment of the present application, Figure 1 As shown, the refrigerant discharge pipe 101 includes a liquid nitrogen discharge pipe, and the refrigerant inlet end 301 and the hydrogen inlet end 302 are both connected to the hydrogen outlet end 303 .

[0042] When the refrigerant discharge pipe 101 is a liquid nitrogen discharge pipe, in this embodiment, by connecting the refrigerant inlet end 301 and the hydrogen inlet end 302 to the hydrogen outlet end 303, the refrigerant is mixed with the hydrogen after entering the heat exchange portion 300, so that the effect of synthesizing ammonia is achieved directly in the process of purifying the hydrogen after passing through the filter 400. Specifically, the refrigerant inlet end 301 and the hydrogen inlet end 302 can share the same inlet end, that is, the refrigerant inlet end 301 is also the hydrogen inlet end 302. Alternatively, the refrigerant inlet end 301 and the hydrogen inlet end 302 are two different inlet ends, and the two inlet ends are arranged in parallel, as long as it can be ensured that the refrigerant inlet end 301 and the hydrogen inlet end 302 are both connected to the hydrogen outlet end 303.

[0043] In another embodiment of the present application, Figure 2 As shown, the refrigerant discharge pipe 101 includes a liquid oxygen discharge pipe, and the heat exchange part 300 includes a refrigerant flow pipe and a hydrogen flow pipe isolated from each other. The refrigerant flow pipe has a refrigerant inlet end 301, and the hydrogen flow pipe has a hydrogen inlet end 302 and a hydrogen outlet end 303.

[0044] By isolating the refrigerant flow pipe and the hydrogen flow pipe from each other, the refrigerant in the heat exchange part 300 only exchanges heat with the hydrogen without mixing with each other. In addition, while condensing and solidifying the moisture in the hydrogen to separate it from the hydrogen, the risk of explosion caused by mixing of hydrogen and oxygen can be avoided.

[0045] Of course, based on the solution that the refrigerant discharge pipe 101 includes a liquid nitrogen discharge pipe, the refrigerant inlet end 301 may also be disconnected from the hydrogen inlet end 302 and the hydrogen outlet end 303 .

[0046] In the embodiment of the present application, the refrigerant discharge pipe 101 is provided with a flow valve (not shown).

[0047] By setting a flow valve in the refrigerant discharge pipe 101, when the refrigerant is liquid nitrogen, the discharge amount of liquid nitrogen can be controlled according to the ratio of nitrogen to hydrogen during ammonia synthesis. For example, the volume of liquid nitrogen and hydrogen can be controlled in a ratio of 1:3 to control the flow rate of liquid nitrogen into the heat exchange part 300.

[0048] Of course, when the refrigerant is liquid oxygen or other substances, the flow valve can also control the flow of liquid oxygen or other substances to control the flow of the refrigerant entering the heat exchange part 300, thereby controlling the heat exchange efficiency between the refrigerant and the hydrogen.

[0049] In the embodiments of the present application, Figure 1 or Figure 2 As shown, there are at least two hydrogen outlet ports 303 , and each hydrogen outlet port 303 is connected to the filter 400 .

[0050] By providing at least two hydrogen outlet ports 303 , each of which is in communication with the filter 400 , the filter 400 can filter more solid ice per unit time, thereby improving the hydrogen purification efficiency.

[0051] In the embodiments of the present application, Figure 1 or Figure 2 As shown, at least two filters 400 are provided, and each filter 400 is connected to at least one hydrogen outlet port 303 .

[0052] By providing at least two filters 400 , each filter 400 being connected to at least the hydrogen outlet 303 , the filtering efficiency of solid ice of the same mass is improved, thereby improving the purification efficiency of hydrogen.

[0053] In the embodiments of the present application, Figure 3 As shown, the hydrogen production device 200 includes an electrolysis device 210 , a gas-liquid separator 220 , and a deoxidation device 230 that are connected in sequence. The deoxidation device 230 has a hydrogen exhaust pipe 201 .

[0054] By providing an electrolysis device 210, the electrolysis device 210 can electrolyze the electrolyte to form hydrogen and oxygen. It is understood that the hydrogen generated by the electrolysis device 210 will be mixed with a small amount of water and oxygen. By providing a gas-liquid separator 220 at the rear end of the electrolysis device 210, the hydrogen mixed with a small amount of water and oxygen can be initially dried. By providing a deoxygenation device 230 at the rear end of the gas-liquid separator 220, the oxygen in the hydrogen can be filtered, so that the hydrogen discharge pipe 201 of the deoxygenation device 230 discharges hydrogen with a smaller amount of water. This portion of hydrogen is then passed into the heat exchange unit 300 for heat exchange with the refrigerant, thereby achieving a secondary drying effect of the hydrogen and achieving a better hydrogen purification effect.

[0055] In the embodiments of the present application, Figure 3 As shown, the hydrogen purification equipment further includes a temperature swing adsorption drying device 500 , which is arranged in parallel with the heat exchange part 300 .

[0056] By including a temperature swing adsorption drying device 500 in the hydrogen purification equipment and arranging it in parallel with the heat exchange unit 300, hydrogen can be passed into the temperature swing adsorption drying device 500 when the heat exchange unit 300 fails or the air separation unit 100 is not operating, thereby purifying the hydrogen discharged from the deoxygenator 230. Furthermore, when hydrogen production is high, hydrogen can be directly passed into the temperature swing adsorption drying device 500 for drying, thereby reducing the frequency of use of the air separation unit 100 and increasing the number of hydrogen purification paths.

[0057] Furthermore, if Figure 3 As shown, the hydrogen purification equipment also includes a first control valve 600, a second control valve 700 and a control unit 800. The first control valve 600 is arranged between the deoxygenation device 230 and the heat exchange part 300, and the second control valve 700 is arranged between the deoxygenation device 230 and the temperature swing adsorption drying device 500. The first control valve 600 and the second control valve 700 are both electrically connected to the control unit 800.

[0058] By disposing a first control valve 600 between the deoxygenator 230 and the heat exchange section 300, and a second control valve 700 between the deoxygenator 230 and the temperature swing adsorption drying device 500, and both the first control valve 600 and the second control valve 700 being electrically connected to the control unit 800, the control unit 800 can control only the first control valve 600 to open, thereby allowing hydrogen to pass into the heat exchange section 300 for heat exchange with the refrigerant, and then solidifying the water in the hydrogen into ice through the filter 400 and filtering out the ice, thereby achieving a hydrogen purification effect. Alternatively, the control unit 800 can control only the second control valve 700 to open, thereby allowing hydrogen to pass into the temperature swing adsorption drying device 500, where the water in the hydrogen is absorbed, thereby achieving a hydrogen purification effect. Alternatively, the control unit 800 can control the first control valve 600 and the second control valve 700 to be open, so that a part of the hydrogen enters the heat exchange part 300 to exchange heat with the refrigerant, and the water in the hydrogen is solidified into ice through the filter 400 and the ice is filtered out to achieve the effect of purifying the hydrogen. The other part of the hydrogen passes into the temperature swing adsorption drying device 500, and the water in the hydrogen is absorbed by the temperature swing adsorption drying device 500 to achieve the effect of purifying the hydrogen.

[0059] In the embodiment of the present application, a flow meter (not shown) is provided at the rear end of the deoxidation device 230 , and the flow meter is electrically connected to the control unit 800 .

[0060] By providing a flow meter at the rear end of the deoxygenator 230, the flow rate of hydrogen currently discharged through the deoxygenator 230 can be detected by the flow meter. By electrically connecting the flow meter to the control unit 800, the control unit 800 can control the opening of the first control valve 600 and / or the second control valve 700 according to the hydrogen flow rate provided by the flow meter. For example, if the flow meter detects that the flow rate of hydrogen is small, the hydrogen with a small output can be allowed to enter the heat exchange part 300 for heat exchange and be purified by the filter 400, thereby facilitating the improvement of the utilization rate of hydrogen. When the flow meter detects that the flow rate of hydrogen is large, the hydrogen with a large output can be allowed to enter the temperature swing adsorption drying device 500 to absorb moisture in the hydrogen, thereby achieving a hydrogen purification effect.

[0061] This application also proposes an ammonia production system, such as Figure 1 or Figure 2As shown, the ammonia production system includes an ammonia synthesis unit 900 and a hydrogen purification device. The specific structure of the hydrogen purification device is similar to that of the above-mentioned embodiments. Since the present ammonia production system utilizes all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and therefore will not be described in detail here. Specifically, the outlet end 402 of the filter 400 is connected to the ammonia synthesis unit 900.

[0062] The above description is merely an exemplary embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A hydrogen purification device, characterized in that: include: An air separation unit having a refrigerant discharge pipe; A hydrogen production device, wherein the hydrogen production device has a hydrogen discharge pipe; a heat exchange portion, the heat exchange portion having a refrigerant inlet end, a hydrogen inlet end, and a hydrogen outlet end, the refrigerant discharge pipe and the hydrogen discharge pipe both being connected to the refrigerant inlet end, the hydrogen discharge pipe being connected to the hydrogen inlet end, and capable of heat exchange between the refrigerant discharged from the refrigerant discharge pipe and the hydrogen discharged from the hydrogen discharge pipe; as well as The filter has an inlet end and an outlet end which are communicated with each other, and the inlet end is communicated with the hydrogen outlet end.

2. The hydrogen purification equipment according to claim 1, characterized in that: The refrigerant discharge pipe includes a liquid nitrogen discharge pipe, and the refrigerant inlet end and the hydrogen inlet end are both connected to the hydrogen outlet end.

3. The hydrogen purification equipment according to claim 1, characterized in that: The refrigerant discharge pipe includes a liquid oxygen discharge pipe, and the heat exchange part includes a refrigerant flow pipe and a hydrogen flow pipe isolated from each other. The refrigerant flow pipe has the refrigerant inlet end, and the hydrogen flow pipe has the hydrogen inlet end and the hydrogen outlet end.

4. The hydrogen purification equipment according to claim 1, characterized in that: The refrigerant discharge pipe is provided with a flow valve.

5. The hydrogen purification equipment according to claim 1, characterized in that: There are at least two hydrogen outlet ports, each of which is connected to the filter; And / or, at least two filters are provided, and each filter is connected to at least one hydrogen outlet port.

6. The hydrogen purification equipment according to any one of claims 1 to 5, characterized in that: The hydrogen production device includes an electrolysis device, a gas-liquid separator, and a deoxidation device that are connected in sequence, and the deoxidation device has the hydrogen exhaust pipe.

7. The hydrogen purification equipment according to claim 6, characterized in that: The hydrogen purification equipment further includes a temperature swing adsorption drying device, which is arranged in parallel with the heat exchange part.

8. The hydrogen purification equipment according to claim 7, characterized in that: The hydrogen purification equipment also includes a first control valve, a second control valve and a control unit. The first control valve is arranged between the deoxygenation device and the heat exchange part, and the second control valve is arranged between the deoxygenation device and the temperature swing adsorption drying device. The first control valve and the second control valve are both electrically connected to the control unit.

9. The hydrogen purification equipment according to claim 8, characterized in that: A flow meter is provided at the rear end of the deoxidation device, and the flow meter is electrically connected to the control unit.

10. An ammonia production system, characterized in that: It comprises an ammonia synthesis device and the hydrogen purification equipment according to any one of claims 1 to 9, wherein the outlet end of the filter is connected to the ammonia synthesis device.

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