Online analysis monitoring system and water electrolysis hydrogen production system

Abstract

The utility model relates to the technical field of hydrogen production, and discloses an on-line analysis monitoring system and a water electrolysis hydrogen production system, the monitoring system comprises a plurality of sampling device pairs which are correspondingly arranged on outlet pipelines of a plurality of sets of electrolytic baths, each sampling device pair comprises two sampling devices, an inlet of one device is connected with a hydrogen outlet of one electrolytic bath, an outlet of the sampling device is connected with a hydrogen outlet header pipe, an inlet of the other device is connected with an oxygen outlet of the electrolytic bath, an outlet of the sampling device is connected with an oxygen outlet header pipe, and a sampling opening is formed in the sampling device; a plurality of sample gas treatment device pairs, each device pair comprising two sample gas treatment devices, each device being connected to a corresponding sampling device through a sampling port and being used for treating and monitoring sample gas; and the drained water collecting device is used for collecting drained water of each sample gas treatment device. According to the utility model, the operation condition of each set of electrolytic cells connected in parallel can be effectively monitored, and the fault of the electrolytic cells can be effectively positioned.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production technology, specifically to an online analysis and monitoring system and an electrolysis water hydrogen production system. Background Technology

[0002] Currently, large-scale hydrogen production stations combining water electrolysis with photovoltaic and wind power generation show significant development prospects. A single water electrolysis hydrogen production system can generally be divided into three units: the electrolyzer, the hydrogen production frame (gas-water separation), and the hydrogen purification unit. The hydrogen production frame unit is equipped with equipment such as circulating pumps and heat exchangers to establish the necessary water circulation for the electrolyzer's operation and to cool the electrolyzer. Furthermore, the hydrogen production frame can perform preliminary separation of the gas produced by the electrolyzer, with the separated water returned to the electrolyzer via a circulating pump within the system.

[0003] Existing technologies that use multiple electrolyzers sharing a single hydrogen production framework (gas-water separation) are economically viable. For example... Figure 1A As shown, for water electrolysis technologies with small single-cell scale, such as PEM (proton exchange membrane) electrolyzers, it is necessary to use multiple cells in parallel to share a single hydrogen production framework in order to control the cost of large-scale systems.

[0004] To ensure system safety, the hydrogen production framework needs to be equipped with online analyzers for oxygen in hydrogen and hydrogen in oxygen to monitor the operation of the electrolyzer and to stop the operation of the electrolyzer if the relevant parameters are too high. Figure 1A The online analyzer is installed on the outlet pipelines of the hydrogen and oxygen separators, and the sample gas obtained is a mixture of the gases produced by each electrolyzer. However, because the mixing of sample gases causes the gas produced by a single electrolyzer to be diluted by the gas produced by other electrolyzers, this configuration makes it impossible to pinpoint which electrolyzer is malfunctioning in the event of a fault. Furthermore, since the gas produced by the faulty electrolyzer is diluted by other electrolyzers, interlocking parameters (oxygen concentration in hydrogen, hydrogen concentration in oxygen) need to be significantly exceeded within the electrolyzer for it to be detected by the analyzer and trigger safety actions within the hydrogen production framework. In the event of a chain reaction, the gas in the faulty electrolyzer may have reached its explosive limit. Therefore, the existing analyzer setup poses certain safety hazards. Summary of the Invention

[0005] The purpose of this invention is to provide an online analysis and monitoring system and an electrolysis water hydrogen production system, which can independently sample, analyze and monitor the hydrogen and oxygen outlets of each electrolyzer, accurately monitor the operation of each parallel electrolyzer, and thus effectively locate electrolyzer faults. It is suitable for hydrogen production systems with multiple cells in parallel.

[0006] To achieve the above objectives, the first aspect of this utility model provides an online analysis and monitoring system for a water electrolysis hydrogen production system with multiple electrolyzers connected in parallel. The online analysis and monitoring system includes: multiple sampling device pairs, correspondingly arranged on the outlet pipelines of the multiple electrolyzers. Each sampling device pair includes: two sampling devices, wherein the inlet of one sampling device is connected to the hydrogen outlet of one electrolyzer, and this sampling device is provided with a sampling port; the outlet of this sampling device is connected to the hydrogen outlet main pipe; and the inlet of the other sampling device is connected to the oxygen outlet of the same electrolyzer. The device is equipped with a sampling port, the outlet of which is connected to the oxygen outlet main pipe; multiple sample gas processing device pairs, each sample gas processing device pair including two sample gas processing devices, each sample gas processing device being connected to the corresponding sampling device via the sampling port, for processing and monitoring the sample gas obtained through the sampling port, wherein each sample gas processing device includes: a pressure reducing valve, a heat exchange water distributor, a dryer, a filter and a monitoring device connected in sequence via pipelines; and a drainage collection device connected to the drain outlet of the heat exchange water distributor in each sample gas processing device, for collecting the drainage of each sample gas processing device.

[0007] Preferably, the sampling device includes: a first connecting pipe, the inlet of which is connected to the hydrogen outlet or the oxygen outlet; a horizontal pipe, the inlet of which is connected to the outlet of the first connecting pipe, wherein the horizontal pipe is provided with the sampling port, and the sampling port is connected to the pressure reducing valve in the sample gas processing device; and a second connecting pipe, the inlet of which is connected to the outlet of the horizontal pipe, and the outlet of which is connected to the hydrogen outlet main pipe or the oxygen outlet main pipe, wherein the outlet of the second connecting pipe is located above the hydrogen outlet main pipe or the oxygen outlet main pipe.

[0008] Preferably, the diameter of the first connecting pipe is expanded to the diameter of the hydrogen outlet main pipe or the oxygen outlet main pipe, while the diameter of the horizontal pipe remains unchanged.

[0009] Preferably, the horizontal pipe includes: a first horizontal pipe with its diameter expanded to the diameter of the hydrogen outlet main pipe or the oxygen outlet main pipe; and a second horizontal pipe connected to the outlet of the first horizontal pipe and having a length greater than or equal to a preset length.

[0010] Preferably, the heat exchange distributor contains a heat exchanger.

[0011] Preferably, the heat exchanger is a coiled tube heat exchanger or a shell-and-tube heat exchanger.

[0012] Preferably, the heat exchange water distributor is provided with an overflow port or a drain valve.

[0013] Preferably, the heat exchange distributor is equipped with a vent needle valve and a drain needle valve.

[0014] Preferably, the drainage collection device includes a drainage tank and a drainage pump connected in sequence by pipes.

[0015] The second aspect of this utility model provides a water electrolysis hydrogen production system comprising multiple sets of electrolyzers connected in parallel, the system including: multiple sets of electrolyzers connected in parallel; a single gas-liquid separation and treatment device; and an online analysis and monitoring system for the water electrolysis hydrogen production system. Through the above technical solution, this utility model creatively sets up multiple sampling device pairs, multiple sample gas treatment device pairs, and a drainage collection device. Specifically, the multiple sampling device pairs are correspondingly arranged on the outlet pipelines of the multiple sets of electrolyzers. The inlet of one sampling device in each pair is connected to the hydrogen outlet of one set of electrolyzers, and this sampling device is provided with a sampling port. The outlet of this sampling device is connected to the main hydrogen outlet pipe. The inlet of the other sampling device in each pair is connected to the oxygen outlet of the same set of electrolyzers, and this sampling device is provided with a sampling port. The outlet of this sampling device is connected to the main oxygen outlet pipe. Each sample gas processing unit includes two sample gas processing devices, each connected to a corresponding sampling device via a sampling port, for processing and monitoring the sample gas obtained through the sampling port. A drainage collection device is connected to the drain outlet of the heat exchange water separator in each sample gas processing unit to collect the drainage from each unit. This invention allows for independent sampling, analysis, and monitoring of the hydrogen and oxygen outlets of each electrolyzer, enabling precise and effective monitoring of the operation of parallel electrolyzers, and is suitable for multi-cell parallel hydrogen production systems.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1A and Figure 1B This is a schematic diagram of an existing online sampling system for hydrogen production via water electrolysis;

[0019] Figure 2 This is a schematic diagram of the structure of an online analysis and monitoring system for a water electrolysis hydrogen production system with multiple electrolyzers connected in parallel, according to an embodiment of this utility model.

[0020] Figure 3This is a schematic diagram of the sampling section of an online analysis and monitoring system for a water electrolysis hydrogen production system with multiple electrolyzers connected in parallel, provided in one embodiment of this utility model.

[0021] Figure 4 This is a schematic diagram of the sampling section pipeline of an online analysis and monitoring system for an electrolytic water hydrogen production system with multiple electrolyzers connected in parallel, provided in one embodiment of this utility model.

[0022] Figure 5 This is a schematic diagram of the sampling gas treatment section of an online analysis and monitoring system for an electrolytic water hydrogen production system with multiple electrolyzers connected in parallel, according to an embodiment of this utility model; and

[0023] Figure 6 This is a schematic diagram of the drainage collection section of an online analysis and monitoring system for an electrolytic water hydrogen production system with multiple electrolyzers connected in parallel, according to an embodiment of this utility model. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0025] Figure 2 This is a schematic diagram of the structure of an online analysis and monitoring system for a water electrolysis hydrogen production system with multiple electrolyzers connected in parallel, according to an embodiment of this utility model. Figure 2 As shown, the online analysis and monitoring system includes: multiple sampling device pairs (e.g., first sampling device pair B1, second sampling device pair B2, ..., Nth sampling device pair BN); multiple sample gas processing device pairs (e.g., first sample gas processing device pair C1, second sample gas processing device pair C2, ..., Nth sample gas processing device pair CN); and a drainage collection device 300.

[0026] The following sections will explain and illustrate each of the above embodiments.

[0027] like Figure 2 As shown, the multiple sampling device pairs (e.g., first sampling device pair B1, second sampling device pair B2, ..., Nth sampling device pair BN) are correspondingly arranged on the outlet pipelines of the multiple sets of electrolytic cells (e.g., first set of electrolytic cells A1, second set of electrolytic cells A2, ..., Nth set of electrolytic cells AN). That is, each sampling device pair is arranged on the outlet pipeline of the corresponding set of parallel electrolytic cells.

[0028] Each sampling device pair includes two sampling devices (e.g., sampling device 100). The inlet of one sampling device 100 is connected to the hydrogen outlet of an electrolyzer; this sampling device 100 is equipped with a sampling port 50; and its outlet is connected to the hydrogen outlet manifold. The inlet of the other sampling device 100 is connected to the oxygen outlet of the same electrolyzer; this sampling device 100 is equipped with a sampling port 50; and its outlet is connected to the oxygen outlet manifold.

[0029] In this embodiment, a sampling device (i.e., a sampling section) is installed on the outlet pipeline of the electrolyzer. One sampling section is installed at the hydrogen outlet and one at the oxygen outlet, meaning each electrolyzer has two sampling sections for hydrogen and oxygen.

[0030] like Figure 2 As shown, each of the plurality of sample gas processing device pairs (e.g., the first sample gas processing device pair C1, the second sample gas processing device pair C2, ... the Nth sample gas processing device pair CN) includes two sample gas processing devices 200. Each sample gas processing device 200 is connected to a corresponding sampling device 100 via the sampling port 50 for processing and monitoring the sample gas acquired through the sampling port 50.

[0031] Each sample gas processing device 200 includes: a pressure reducing valve vv1, a heat exchange water distributor V1, a dryer v2, a filter F1, and a monitoring device D1, which are connected in sequence by pipelines.

[0032] Specifically, the pressure reducing valve may be a self-operated pressure reducing valve.

[0033] Sample gas processing device (i.e., sample gas processing section) reference Figure 5 The sample gas is introduced into the system through a sampling tube and first depressurized to a slightly positive pressure via a pressure reducing valve vv1. After depressurization, the sample gas passes through a heat exchanger v1 to separate any condensate it carries. The heat exchanger within v1 cools the sample gas with chilled water. The condensate generated during cooling is collected in v1 by gravity. The liquid in v1 can be discharged through an overflow port or drained through a bottom drain valve. After cooling, the sample gas is sent to a dryer v2 via a top pipeline, processed by a filter F1, and finally delivered to a monitoring device D1 (e.g., an online analyzer) for analysis.

[0034] The drainage collection device 300 is connected to the drain outlet of the heat exchange water distributor in each sample gas treatment device 200, and is used to collect the drainage from each sample gas treatment device.

[0035] The condensate separated by the cooling water distributors in each sample gas treatment section is collected and sent to the drainage collection device (i.e., the drainage collection section). After being collected in the drainage collection section by a collection tank, it is pumped back to the electrolytic water system for recycling.

[0036] The system in this embodiment includes a sampling section, a sample gas processing section, and a drainage collection section. Unlike the sampling locations in commonly available hydrogen production framework (gas-liquid separation) equipment, this system has sampling sections installed on the hydrogen and oxygen pipelines at the outlet of each parallel electrolyzer. The sampling sections improve the flow pattern of the gas-liquid two-phase flow and deliver the collected sample gas to the sample gas processing section. In the sample gas processing section, the sample gas undergoes pressure reduction, cooling, water separation, drying, and filtration before being sent to a monitoring device (e.g., an online analyzer). The sample gas processed in the sample gas processing section meets the inlet requirements of various analyzers on the market and can be installed in various electrolytic water hydrogen production systems. The condensate generated during the sample gas cooling and water separation process is collected in the drainage collection section and recycled back to the electrolytic water system.

[0037] like Figure 4 As shown, the sampling device 100 includes: a first connecting pipe 110, the inlet of which is connected to the hydrogen outlet or the oxygen outlet; and a horizontal pipe 120, the inlet of which is connected to the outlet of the first connecting pipe 110. The horizontal pipe 120 is provided with a sampling port 50, which is connected to a pressure reducing valve (e.g., in the sample gas processing device). Figure 5 The system is connected to a pressure reducing valve (vv1) in the middle; and a second connecting pipe 130, the inlet of which is connected to the outlet of the horizontal pipe 120, and the outlet of which is connected to a hydrogen outlet main pipe or an oxygen outlet main pipe, wherein the outlet of the second connecting pipe 130 is located above the hydrogen outlet main pipe or the oxygen outlet main pipe.

[0038] In this embodiment, the outlet of the second connecting pipe is located above the main pipe, which makes the hydrogen or oxygen sample gas drier.

[0039] For the sampling device, the sampling device (e.g., the sampling section) needs to expand the pipe diameter to the main pipe diameter, and the branch pipe after the expansion of the sampling section should not be reduced in diameter and should be connected to the top of the main pipe. The following describes two embodiments. In one embodiment, the diameter is expanded through the first connecting pipe 110, while the diameters of the horizontal pipe 120 and the second connecting pipe 130 remain unchanged (both are the same as the main pipe diameter); in another embodiment, the diameter is mainly expanded through the horizontal pipe 120, while the diameter of the second connecting pipe 130 remains unchanged, and the first connecting pipe 110 can be appropriately expanded or not expanded depending on the actual situation (its inlet is...). Figure 3 (The diameters of the hydrogen outlets 3a and 3b or the oxygen outlets 4a and 4b are the same).

[0040] In one embodiment, the diameter of the first connecting pipe 110 is expanded to the diameter of the hydrogen outlet main pipe or the oxygen outlet main pipe, while the diameter of the horizontal pipe 120 remains unchanged.

[0041] The sampling section is set up as shown in Figure 4. The sampling port is located at the top of the horizontal pipe 120 of the sampling section to minimize the water content in the sample gas. The sample gas from each sampling section is sent to a separate sample gas treatment section to ensure that each sample gas is treated independently and is not cross-contaminated.

[0042] In another embodiment, the horizontal pipe 120 includes: a first horizontal pipe with its diameter expanded to the diameter of the hydrogen outlet main pipe or the oxygen outlet main pipe; and a second horizontal pipe connected to the outlet of the first horizontal pipe and having a length greater than or equal to a preset length.

[0043] For systems with long horizontal pipes in the transverse direction of the branch pipes, the sampling section can be expanded at the horizontal pipe. However, a sufficient length of horizontal pipe section must be reserved to ensure manifold stability, and the sampling port should be set at the manifold stable pipe section (e.g., at any position after a predetermined length proportion of the horizontal pipe section), which is not shown in the figure.

[0044] The sampling section in the above embodiments can improve the flow pattern of the gas-liquid two-phase flow and send the obtained sample gas to the sample gas processing section.

[0045] In one embodiment, the heat exchanger V1 is equipped with a heat exchanger E1, such as... Figure 5 As shown.

[0046] The heat exchanger E1 can be a coiled tube heat exchanger or a shell-and-tube heat exchanger. That is to say, the internal heat exchanger currently uses a coiled tube heat exchanger, which can be changed to a shell-and-tube heat exchanger or other types of heat exchange equipment according to actual needs.

[0047] In one embodiment, the heat exchange water distributor V1 is provided with an overflow port or a drain valve.

[0048] In other words, the drainage of the heat exchanger V1 can be done by overflow, or it can be changed to a drain valve (such as a regulating valve) for level control according to actual needs. That is, the level gauge remotely controls the bottom drain regulating valve of the equipment.

[0049] In one embodiment, the heat exchange water distributor V1 is equipped with a vent needle valve and a drain needle valve.

[0050] like Figure 5 As shown, a vent needle valve vv2 is installed on the top pipeline of the heat exchanger V1 for venting the sample gas. The dried sample gas is filtered to remove impurities and then sent to the online analyzer for analysis. A drain needle valve vv3 is connected to the bottom of the heat exchanger V1 via pipe 15.

[0051] In one embodiment, the drainage collection device includes a drainage tank V3 and a drainage pump P1 connected in sequence by pipes, such as... Figure 6 As shown.

[0052] Among them, drainage tank V3 is an atmospheric pressure device. Its liquid level is controlled by a remote signal transmitted from a level gauge to control the frequency of the bottom drainage pump (that is, the frequency of the drainage pump is controlled by adjusting the frequency converter VFD through the level control LT), thereby adjusting the water output of the equipment to ensure a stable liquid level. The drained water can be sent to the electrolytic water system for recycling.

[0053] The drainage collection section collects the drainage from each sample gas processing section, including a drainage tank V3 and a drainage pump P1. Specifically, the drainage from each sample gas processing section is collected through pipe 17 and sent to the drainage tank V3; the drainage tank is connected to the drainage pump P1 through pipe 18; and the drainage pump P1 is connected to the hydrogen production system through pipe 19.

[0054] One embodiment of this utility model provides an online analysis and monitoring system for a water electrolysis hydrogen production system with multiple electrolyzers connected in parallel, including a sampling section (such as...). Figure 3 Sampling devices a1, a2, b1, b2... and sample gas processing section (e.g.) Figure 5 As shown), drainage collection section (such as...) Figure 6 (As shown).

[0055] like Figure 3 As shown, sampling sections are located on the outlet pipelines of the electrolyzer (e.g., pipelines 3a, 4a, 3b, 4b, ...). Each electrolyzer has one sampling section at both its hydrogen and oxygen outlets. Each sampling section corresponds to a sample gas processing section. The sampling sections are connected to the hydrogen outlet main pipe 7 or the oxygen outlet main pipe 8 via pipelines (e.g., pipelines 5a, 6a, 5b, 5b, ...).

[0056] like Figure 5 As shown, the sample gas processing section includes: a pressure reducing valve vv1 (e.g., a self-regulating pressure reducing valve), a heat exchanger distributor V1, a venting needle valve vv2, a drain needle valve vv3, a dryer V2, and a filter F1. The heat exchanger distributor contains a heat exchanger E1. The sample gas is delivered to the sample gas processing section via pipe 9 and connected to the pressure reducing valve vv1; the pressure reducing valve vv1 is connected to the heat exchanger distributor V1 via pipe 10, where the sample gas is cooled and separated into water; the bottom of the heat exchanger distributor V1 is connected to the drain needle valve vv3 via pipe 15, and the drained gas is delivered to the drain collection section via a pipe at the bottom, while the top is connected to the venting needle valve vv2 via pipe 16; the top outlet of the heat exchanger distributor V1 is connected to the dryer V2 via pipe 11; the dryer V2 is connected to the filter F1 via pipe 12 to remove impurities; the filter F1 delivers the gas to the monitoring device D1 (e.g., an analyzer) via pipe 13 for online analysis.

[0057] like Figure 6As shown, the drainage collection section collects the drainage from each sample gas processing section and is equipped with the capability to send the drainage for recycling. It includes a drainage tank V3 and a drainage pump P1. Specifically, the drainage from each sample gas processing section is collected and sent to the drainage tank V3 via pipe 17; the drainage tank is connected to the drainage pump P1 via pipe 18; and the drainage pump P1 is connected to the hydrogen production system via pipe 19.

[0058] The present invention will be further illustrated by the following embodiments, but the present invention is not limited thereto.

[0059] Example 1

[0060] This embodiment provides an online analysis and monitoring system for a water electrolysis hydrogen production system with multiple electrolyzers connected in parallel. For example... Figure 3-6 As shown. Sample gas is collected through sampling sections a1, a2, b1, and b2 and then sent to pressure reducing valve vv1 in the sample gas processing section. After pressure reduction, the sample gas is sent to heat exchanger / water separator V1 via pipeline 10. The sample gas is cooled and separated into water inside heat exchanger / water separator V1. The drained gas is sent to the drain collection unit via a pipeline at the bottom. After cooling, the sample gas is sent to dryer V2 via top pipeline 11; after dehydration in dryer V2, the sample gas is sent to filter F1 via pipeline 12 to remove impurities, and finally sent to the analyzer for online analysis via pipeline 13.

[0061] The drainage collection section collects the drainage from each sample gas processing section. The drainage is collected and sent to the drainage tank V3 via pipe 17. The drainage tank is connected to the drainage pump P1 via pipe 18. The drainage pump P1 is connected to the hydrogen production system for recovery via pipe 19.

[0062] Comparative Example 1

[0063] like Figure 1A or Figure 1B The diagram shows an online sampling system for hydrogen production via water electrolysis. It performs online sampling of crude hydrogen gas or crude sample gas, and includes a pressure reducing valve vv1, a dryer V2, and a filter F1.

[0064] The sample gas sampling port is directly located on the upper part or outlet pipeline of the hydrogen or oxygen separator V4. After the sample gas is depressurized by the pressure reducing valve vv1 in pipeline 21, it is sent to the dryer V2 through pipeline 22. After being dehydrated in the dryer V2, the sample gas is sent to the filter F1 through pipeline 23 to remove impurities, and finally sent to the analyzer for online analysis through pipeline 24.

[0065] A comparison of Example 1 and Comparative Example 1 revealed that Comparative Example 1, by sampling at the hydrogen or oxygen separator, obtained a mixed gas of the gases produced by each electrolyzer. Sampling at this point makes it impossible to pinpoint which electrolyzer is malfunctioning if an anomaly is detected. Furthermore, the mixing of the sample gases dilutes the gas produced by a single electrolyzer, making it difficult to troubleshoot an anomaly in a single cell. Compared to Example 1, Comparative Example 1 cannot locate the malfunctioning electrolyzer in the event of a fault, and therefore is not suitable for systems with multiple cells connected in parallel.

[0066] In summary, this utility model creatively provides multiple sampling device pairs, multiple sample gas processing device pairs, and a drainage collection device. The multiple sampling device pairs are correspondingly arranged on the outlet pipelines of the multiple electrolytic cells. In each sampling device pair, the inlet of one sampling device is connected to the hydrogen outlet of one electrolytic cell, and this sampling device is equipped with a sampling port. The outlet of this sampling device is connected to the main hydrogen outlet pipe. The inlet of the other sampling device is connected to the oxygen outlet of the same electrolytic cell, and this sampling device is equipped with a sampling port. The outlet of this sampling device is connected to the main oxygen outlet pipe. Each sample gas processing device pair includes two sample gas processing devices, each of which is connected to the corresponding sampling device via the sampling port, for processing and monitoring the sample gas obtained through the sampling port. The drainage collection device is connected to the drain outlet of the heat exchange water separator in each sample gas processing device, for collecting the drainage from each sample gas processing device. This invention allows for independent sampling, analysis, and monitoring of the hydrogen and oxygen outlets of each electrolyzer, enabling precise and effective monitoring of the operation of each parallel electrolyzer. It is suitable for hydrogen production systems with multiple cells connected in parallel.

[0067] One embodiment of this utility model provides a water electrolysis hydrogen production system with multiple sets of electrolyzers connected in parallel. The water electrolysis hydrogen production system includes: multiple sets of electrolyzers connected in parallel; a single gas-liquid separation and treatment device; and an online analysis and monitoring system for the water electrolysis hydrogen production system with multiple sets of electrolyzers connected in parallel.

[0068] Among them, multiple sets of electrolytic cells connected in parallel share a single gas-liquid separation and treatment device.

[0069] This embodiment independently samples, analyzes, and monitors the hydrogen and oxygen outlets of each electrolyzer, enabling precise and effective monitoring of the operation of each parallel electrolyzer. This allows for effective location of electrolyzer faults and avoids various safety hazards associated with existing analyzers, making it suitable for hydrogen production systems with multiple cells in parallel.

[0070] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0072] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0073] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. An online analysis and monitoring system for a water electrolysis hydrogen production system consisting of multiple electrolyzers connected in parallel, characterized in that, The online analysis and monitoring system includes: Multiple sampling device pairs are correspondingly installed on the outlet pipelines of the multiple electrolytic cells, wherein each sampling device pair includes: two sampling devices. One sampling device has its inlet connected to the hydrogen outlet of an electrolytic cell, and the sampling device is equipped with a sampling port. The outlet of the sampling device is connected to the hydrogen outlet main pipe. The other sampling device has its inlet connected to the oxygen outlet of the electrolytic cell, and the other sampling device is equipped with a sampling port. The outlet of the sampling device is connected to the oxygen outlet main pipe. Multiple sample gas processing device pairs, each sample gas processing device pair including two sample gas processing devices, each sample gas processing device being connected to a corresponding sampling device via the sampling port, for processing and monitoring the sample gas acquired through the sampling port, wherein each sample gas processing device includes: a pressure reducing valve, a heat exchange water distributor, a dryer, a filter, and a monitoring device connected sequentially via pipelines; and A drainage collection device is connected to the drain outlet of the heat exchange water distributor in each sample gas treatment device, and is used to collect the drainage from each sample gas treatment device.

2. The online analysis and monitoring system according to claim 1, characterized in that, The sampling device includes: A first connecting pipe, the inlet of which is connected to the hydrogen outlet or the oxygen outlet; A horizontal pipe, the inlet of which is connected to the outlet of the first connecting pipe, wherein the horizontal pipe is provided with a sampling port, and the sampling port is connected to a pressure reducing valve in the sample gas processing device; and The second connecting pipe has its inlet connected to the outlet of the horizontal pipe and its outlet connected to the hydrogen outlet main or the oxygen outlet main, wherein the outlet of the second connecting pipe is located above the hydrogen outlet main or the oxygen outlet main.

3. The online analysis and monitoring system according to claim 2, characterized in that, The diameter of the first connecting pipe is expanded to the diameter of the hydrogen outlet main pipe or the oxygen outlet main pipe, while the diameter of the horizontal pipe remains unchanged.

4. The online analysis and monitoring system according to claim 2, characterized in that, The horizontal pipe includes: The first horizontal pipe, whose diameter is expanded to the diameter of the hydrogen outlet main or the oxygen outlet main; and The second horizontal pipe is connected to the outlet of the first horizontal pipe and has a length greater than or equal to a preset length.

5. The online analysis and monitoring system according to claim 1, characterized in that, The heat exchanger is installed inside the heat exchange water distributor.

6. The online analysis and monitoring system according to claim 5, characterized in that, The heat exchanger is a coiled tube heat exchanger or a shell-and-tube heat exchanger.

7. The online analysis and monitoring system according to claim 1, characterized in that, The heat exchange water distributor is equipped with an overflow port or a drain valve.

8. The online analysis and monitoring system according to claim 1, characterized in that, The heat exchange water distributor is equipped with a vent needle valve and a drain needle valve.

9. The online analysis and monitoring system according to claim 1, characterized in that, The drainage collection device includes a drainage tank and a drainage pump connected in sequence by pipes.

10. A water electrolysis hydrogen production system, wherein the water electrolysis hydrogen production system is used for multiple electrolyzers connected in parallel, characterized in that, The water electrolysis hydrogen production system includes: Multiple electrolytic cells connected in parallel; A single gas-liquid separation and processing unit; and The online analysis and monitoring system according to any one of claims 1-9.

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