Hydrogen purification system

Abstract

The application discloses a hydrogen purification system, and relates to the technical field of hydrogen purification.The hydrogen purification system comprises a gas-water separator, a plurality of drying towers and a first heating container, the gas-water separator is provided with a first water outlet, the plurality of drying towers comprise at least one regeneration tower, an air inlet flow path of the regeneration tower is provided with a first heater, the first heating container is provided with a water inlet and an evaporation outlet, the water inlet is communicated with the first water outlet, and a gas passing pipeline is arranged in the first heating container, and an air inlet of the gas passing pipeline is communicated with an air outlet of the regeneration tower.The technical scheme provided by the application aims to reduce the treatment cost of condensed water.

Description

Technical Field

[0001] This application relates to the field of hydrogen purification technology, and in particular to a hydrogen purification system. Background Technology

[0002] In hydrogen purification processes, condensate is generated after the feed gas is processed. In related technologies, this condensate is typically collected and discharged into a wastewater treatment system for centralized wastewater treatment, increasing investment in wastewater pipelines and treatment facilities. Utility Model Content

[0003] The main objective of this application is to propose a hydrogen purification system designed to reduce the cost of condensate treatment.

[0004] To achieve the above objectives, the hydrogen purification system proposed in this application includes: A gas-water separator, wherein the gas-water separator is provided with a first drain outlet; Multiple drying towers, the multiple drying towers including at least one regeneration tower, the inlet air passage of the regeneration tower being provided with a first heater; and A first heating container has a water inlet and an evaporation outlet. The water inlet is connected to a first drain outlet. An air passage is provided inside the first heating container, and the air inlet of the air passage is connected to the exhaust outlet of the regeneration tower.

[0005] In one embodiment, the first heating container is provided with a vent pipe on its exterior, and the vent pipe is connected to the evaporation outlet.

[0006] In one embodiment, the hydrogen purification system further includes a second heating container, and the first heating container also has a second drain outlet connected to the second heating container.

[0007] In one embodiment, the first heater is housed within the second heating container.

[0008] In one embodiment, the first heating container is provided with a level gauge, and a control valve is provided between the second drain outlet and the second heating container, the control valve being electrically connected to the level gauge.

[0009] In one embodiment, the hydrogen purification system further includes a deoxygenator, the exhaust port of which is connected to the drying tower, a heat exchanger is provided inside the deoxygenator, the heat exchanger is provided with a water passage, the inlet of which is connected to the first drain outlet, and the outlet of which is connected to the water inlet.

[0010] In one embodiment, the gas-water separator includes a first gas-water separator, and the hydrogen purification system further includes a second heater, wherein the first gas-water separator and the second heater are sequentially disposed upstream of the deoxygenator.

[0011] In one embodiment, the gas-water separator includes a second gas-water separator, and the hydrogen purification system further includes a first gas cooler. The first gas cooler and the second gas-water separator are sequentially arranged between the deoxygenator and the drying tower.

[0012] In one embodiment, the air inlet path of the plurality of drying towers includes a first branch and a second branch. The plurality of drying towers also include a first adsorption tower and a second adsorption tower. The first branch is connected to the air inlet of the first adsorption tower, the second branch is connected to the air inlet of the second adsorption tower, the exhaust port of the first adsorption tower is connected to the purification outlet, and the exhaust port of the second adsorption tower is connected to the air inlet of the first heater.

[0013] In one embodiment, the gas-water separator includes a third gas-water separator, and the hydrogen purification system further includes a second gas cooler. The second gas cooler and the third gas-water separator are sequentially arranged downstream of the gas pipeline, and the exhaust port of the third gas-water separator is connected to at least one of the first branch and the second branch.

[0014] In this technical solution, condensate enters the first heating container through the inlet. The gas, heated by the first heater, enters the regeneration tower. The gas exiting the regeneration tower still has a high temperature. When it passes through the gas passage in the first heating container, it heats the condensate entering the first heating container, causing it to evaporate. The resulting water vapor is discharged through the evaporation outlet, and trace impurities in the condensate are ultimately precipitated in solid form. Therefore, this application achieves highly efficient evaporation treatment of condensate by recovering the waste heat from the regeneration tower exhaust, significantly reducing wastewater treatment costs. Simultaneously, the condensate absorbs heat during evaporation, which also cools the high-temperature gas exiting the regeneration tower, further improving the overall energy utilization efficiency of the system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the hydrogen purification system provided in this application; Figure 2 This is a schematic diagram of another embodiment of the hydrogen purification system provided in this application.

[0017] Explanation of icon numbers: 100. Gas-liquid separator; 101. First drain outlet; 110. First gas-liquid separator; 120. Second gas-liquid separator; 130. Third gas-liquid separator; 200. Drying tower; 201. Regeneration tower; 202. First adsorption tower; 203. Second adsorption tower; 310. First heater; 320. Second heater; 400, First heating container; 401, Water inlet; 402, Evaporation outlet; 403, Second drain outlet; 410, Gas passage pipe; 420, Vent pipe; 430, Level gauge; 440, Control valve; 500. Second heating container; 600. Deaerator; 610. Heat exchanger; 710. First gas cooler; 720. Second gas cooler; 810, First branch; 820, Second branch; 830, Purification outlet.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Specific Implementation The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0022] This application proposes a hydrogen purification system.

[0023] Please see Figure 1 and Figure 2 In one embodiment of this application, the hydrogen purification system includes: Gas-water separator 100, wherein the gas-water separator 100 is provided with a first drain outlet 101; Multiple drying towers 200, each including at least one regeneration tower 201, the inlet flow path of which is provided with a first heater 310; and A first heating container 400 has a water inlet 401 and an evaporation outlet 402. The water inlet 401 is connected to the first drain outlet 101. An air passage 410 is provided inside the first heating container 400. The air inlet of the air passage 410 is connected to the exhaust outlet of the regeneration tower 201. The air passage 410 can be configured as a coil.

[0024] It is understandable that the condensate discharged from the first drain outlet 101 of the gas-water separator 100 is usually relatively clean, with the main components being desalinated water or process condensate with low impurity content. If it is directly treated as wastewater without being utilized as a resource, it will not only waste water resources, but also increase the transport load of the sewage pipe network and the construction and operation costs of sewage treatment facilities.

[0025] In this application's technical solution, condensate enters the first heating container 400 through inlet 401. Gas, heated by the first heater 310, enters the regeneration tower 201. The gas discharged from the regeneration tower 201 still has a high temperature. When it passes through the gas passage 410 within the first heating container 400, it heats the condensate entering the first heating container 400, causing it to evaporate. The resulting water vapor is discharged through the evaporation outlet 402. Trace impurities in the condensate ultimately precipitate out in solid form. Therefore, this application achieves efficient evaporation treatment of condensate by recovering the waste heat from the exhaust of the regeneration tower 201, significantly reducing the cost of condensate treatment. Simultaneously, the condensate absorbs heat during evaporation, which also cools the high-temperature gas discharged from the regeneration tower 201, further improving the overall energy utilization efficiency of the system.

[0026] In one embodiment, please refer to Figure 1 The first heating container 400 is provided with a vent pipe 420 on its exterior, which is connected to the evaporation outlet 402. In this way, water vapor can be guided to a suitable location for discharge through the vent pipe 420, for example, achieving high-point venting and preventing steam from accumulating locally. In other embodiments, the first heating container 400 can also be designed as an open structure, with the open portion serving as the evaporation outlet 402.

[0027] In one embodiment, please refer to Figure 1 The hydrogen purification system further includes a second heating container 500, and the first heating container 400 also has a second drain outlet 403, which is connected to the second heating container 500. Thus, when the condensate in the first heating container 400 fails to evaporate completely due to insufficient heat from the exhaust of the regeneration tower 201, the unevaporated condensate can flow into the second heating container 500 through the second drain outlet 403, where it is further heated and evaporated, ensuring that the condensate is thoroughly treated and achieving the goal of zero wastewater discharge from the system. The second heating container 500 can be configured as an open type, with its opening serving as the outlet for water vapor; alternatively, a conduit can be installed outside the second heating container 500 to guide the water vapor out. In other embodiments, an auxiliary heating device can also be installed inside the first heating container 400 to assist in heating the condensate and ensuring its complete evaporation.

[0028] In one embodiment, please refer to Figure 1The first heater 310 is housed within the second heating container 500. Thus, the heat dissipated by the first heater 310 during the heating of the regeneration gas can be directly used to heat the condensate in the second heating container 500, achieving secondary utilization of electrical or thermal energy, further improving the overall energy efficiency of the system, and reducing the need for additional heat sources. In other embodiments, the second heating container 500 can also be heated by an additional heating device.

[0029] In one embodiment, please refer to Figure 1 The first heating container 400 is equipped with a level gauge 430, and a control valve 440 is provided between the second drain outlet 403 and the second heating container 500. The control valve 440 is electrically connected to the level gauge 430. Thus, when the liquid level in the first heating container 400 reaches a preset high limit, the level gauge 430 triggers the control valve 440 to open, automatically draining excess condensate into the second heating container 500; when the liquid level drops to a low limit, the control valve 440 closes to prevent dry burning or ineffective drainage, thereby achieving automated and safe operation of the condensate treatment process. In other embodiments, the second drain outlet 403 can be set at a certain height, automatically draining into the second heating container 500 when the liquid level rises to that height.

[0030] In one embodiment, please refer to Figure 1 The hydrogen purification system also includes a deoxygenator 600, the exhaust port of which is connected to the drying tower 200. The deoxygenator 600 contains a heat exchanger 610, which has a water pipe (not shown). The inlet of the water pipe is connected to the first drain outlet 101, and the outlet is connected to the water inlet 401. Thus, the low-temperature condensate from the gas-liquid separator 100 flows through the heat exchanger 610 inside the deoxygenator 600 before entering the first heating container 400. The residual heat from the high-temperature hydrogen after the deoxygenation reaction preheats the condensate, reducing the energy consumption required for subsequent evaporation and providing preliminary cooling of the deoxygenated hydrogen, achieving bidirectional recovery and utilization of both cold and heat energy.

[0031] In one embodiment, please refer to Figure 1 The gas-liquid separator 100 includes a first gas-liquid separator 110, and the hydrogen purification system further includes a second heater 320. The first gas-liquid separator 110 and the second heater 320 are sequentially located upstream of the deoxidizer 600. Thus, the crude hydrogen discharged from the gas-liquid separator first passes through the first gas-liquid separator 110 to remove entrained liquid water, and then is heated by the second heater 320 before entering the deoxidizer 600. This avoids the deoxidation catalyst activity decreasing due to low-temperature gas and prevents moisture from entering the deoxidizer 600 and causing catalyst poisoning or bed blockage, ensuring the efficient and stable deoxidation reaction.

[0032] In one embodiment, please refer to Figure 1 The gas-liquid separator 100 includes a second gas-liquid separator 120, and the hydrogen purification system also includes a first gas cooler 710. The first gas cooler 710 and the second gas-liquid separator 120 are sequentially arranged between the deoxygenator 600 and the drying tower 200. Thus, the water vapor generated by the deoxygenation reaction, after flowing out with the hydrogen gas, is condensed into liquid water by the first gas cooler 710, and then separated by the second gas-liquid separator 120. This effectively prevents liquid water from entering the drying tower 200 and affecting the adsorbent performance. Simultaneously, this condensate is also passed into the first heating container 400 for evaporation, achieving centralized treatment of the condensate. Specifically, the condensate discharged from the second gas-liquid separator 120 also enters the water pipe in the heat exchanger 610, and generally exchanges heat with the gas in the deoxygenator 600, along with the condensate discharged from the first gas-liquid separator 110.

[0033] In one embodiment, please refer to Figure 2 The gas inlet paths of the plurality of drying towers 200 include a first branch 810 and a second branch 820. The plurality of drying towers 200 also include a first adsorption tower 202 and a second adsorption tower 203. The first branch 810 is connected to the inlet of the first adsorption tower 202, and the second branch 820 is connected to the inlet of the second adsorption tower 203. The exhaust port of the first adsorption tower 202 is connected to the purification outlet 830, and the exhaust port of the second adsorption tower 203 is connected to the inlet of the first heater 310. Specifically, the main portion of the raw material gas enters the first adsorption tower 202 via the first branch 810, is adsorbed, and then discharged through the purification outlet 830. The other portion of the raw material gas is diverted to the second adsorption tower 203 via the second branch 820, is adsorbed, and then enters the first heater 310 for heating. The heated gas then enters the regeneration tower 201 to regenerate the adsorbent material in the regeneration tower 201.

[0034] It is understood that there are at least three drying towers 200, with different drying towers 200 working alternately as adsorption towers and regeneration towers 201, in order to achieve continuous operation of the hydrogen purification process, periodic regeneration of the adsorbent, and stable and efficient operation of the system as a whole.

[0035] In one embodiment, please refer to Figure 2 The gas-water separator 100 includes a third gas-water separator 130, and the hydrogen purification system also includes a second gas cooler 720. The second gas cooler 720 and the third gas-water separator 130 are sequentially arranged downstream of the gas pipeline 410. The exhaust port of the third gas-water separator 130 is connected to at least one of the first branch 810 and the second branch 820.

[0036] Thus, the gas discharged from the first heating container 400 is first cooled by the second gas cooler 720, causing the trace amounts of water vapor entrained in it to condense and precipitate. This condensate is then separated by the third gas-water separator 130. The condensate discharged from the third gas-water separator 130 also flows into the water pipe, and together with the condensate discharged from the first and second gas-water separators 120, flows through the heat exchanger 610 in the deaerator 600 for preheating. It can be understood that the condensate discharged from gas-water separators 100 located elsewhere in the system can also be centrally introduced into this heat exchange loop in the same manner, achieving unified recovery of condensate and cascaded energy utilization throughout the system.

[0037] Furthermore, the exhaust port of the third gas-water separator 130 is connected to one of the first branch 810 and the second branch 820, so that the regenerated exhaust gas after cooling and dehydration can be used as a supplementary gas source to be reinjected into the main process flow. For example, when the cleanliness of the exhaust gas meets the requirements, it can be introduced into the first branch 810, mixed with the raw material gas, and then enter the first adsorption tower 202 for final purification and output; or in a specific operating mode, it can be introduced into the second branch 820 for pre-purging, pressurization, or auxiliary regeneration of the second adsorption tower 203, thereby improving the hydrogen recovery rate and reducing the consumption of product hydrogen.

[0038] The above description is merely an exemplary embodiment of this application and does not limit the scope of protection of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A hydrogen purification system, characterized in that, include: A gas-water separator (100) is provided with a first drain outlet (101); A plurality of drying towers (200), the plurality of drying towers (200) including at least one regeneration tower (201), the inlet flow path of the regeneration tower (201) being provided with a first heater (310); and A first heating container (400) has a water inlet (401) and an evaporation outlet (402). The water inlet (401) is connected to the first drain outlet (101). An air passage (410) is provided inside the first heating container (400). The air inlet of the air passage (410) is connected to the exhaust outlet of the regeneration tower (201).

2. The hydrogen purification system as described in claim 1, characterized in that, The first heating container (400) is provided with a vent pipe (420) on its exterior, and the vent pipe (420) is connected to the evaporation outlet (402).

3. The hydrogen purification system as described in claim 1, characterized in that, The hydrogen purification system further includes a second heating container (500), and the first heating container (400) also has a second drain outlet (403), which is connected to the second heating container (500).

4. The hydrogen purification system as described in claim 3, characterized in that, The first heater (310) is housed within the second heating container (500).

5. The hydrogen purification system as described in claim 3, characterized in that, The first heating container (400) is equipped with a level gauge (430), and a control valve (440) is provided between the second drain outlet (403) and the second heating container (500), and the control valve (440) is electrically connected to the level gauge (430).

6. The hydrogen purification system as described in claim 1, characterized in that, The hydrogen purification system also includes a deoxygenator (600), the exhaust port of which is connected to the drying tower (200). The deoxygenator (600) is equipped with a heat exchanger (610), which is provided with a water pipe. The inlet of the water pipe is connected to the first drain outlet (101), and the outlet of the water pipe is connected to the water inlet (401).

7. The hydrogen purification system as described in claim 6, characterized in that, The gas-water separator (100) includes a first gas-water separator (110), and the hydrogen purification system further includes a second heater (320). The first gas-water separator (110) and the second heater (320) are sequentially located upstream of the deoxygenator (600).

8. The hydrogen purification system as described in claim 6, characterized in that, The gas-water separator (100) includes a second gas-water separator (120), and the hydrogen purification system further includes a first gas cooler (710). The first gas cooler (710) and the second gas-water separator (120) are sequentially arranged between the deoxygenator (600) and the drying tower (200).

9. The hydrogen purification system according to any one of claims 1 to 7, characterized in that, The air inlet paths of the plurality of drying towers (200) include a first branch (810) and a second branch (820). The plurality of drying towers (200) also include a first adsorption tower (202) and a second adsorption tower (203). The first branch (810) is connected to the air inlet of the first adsorption tower (202), the second branch (820) is connected to the air inlet of the second adsorption tower (203), the exhaust port of the first adsorption tower (202) is connected to the purification outlet (830), and the exhaust port of the second adsorption tower (203) is connected to the air inlet of the first heater (310).

10. The hydrogen purification system as described in claim 9, characterized in that, The gas-water separator (100) includes a third gas-water separator (130), and the hydrogen purification system further includes a second gas cooler (720). The second gas cooler (720) and the third gas-water separator (130) are sequentially arranged downstream of the gas pipeline (410). The exhaust port of the third gas-water separator (130) is connected to at least one of the first branch (810) and the second branch (820).

Images