CN220413538U - Hydrogen production system - Google Patents

Abstract

The utility model discloses a hydrogen production system. The hydrogen production system comprises: an electrolytic cell and a gas purity detection bypass, the gas purity detection bypass being connected to the electrolytic cell; the gas purity detection bypass includes: a gas-liquid separation module and a purity detection module; the electrolytic tank is connected with the gas-liquid separation module through a first pipeline; the gas-liquid separation module is connected with the purity detection module through a second pipeline; the purity detection module is used for continuously detecting the hydrogen content in oxygen or the oxygen content in hydrogen of the sampling gas of the electrolytic cell. The technical scheme of the embodiment of the utility model can continuously sample and detect the purity of the gas at the outlet of the electrolytic cell, and is beneficial to improving the safety of the hydrogen production system.

Description

Hydrogen production system

Technical Field

The embodiment of the utility model relates to the technical field of hydrogen production by water electrolysis, in particular to a hydrogen production system.

Background

Hydrogen is regarded as an ideal energy carrier because of its advantages of green low carbon, high efficiency, storability, transportable, and the like. The method for producing hydrogen by electrolyzing water by utilizing renewable energy sources such as wind power generation, photovoltaic power generation and the like is one of important production modes of hydrogen in the future.

At present, the alkaline water electrolysis hydrogen production technology is mainly adopted at present because of the advantages of relatively mature technology, lower equipment manufacturing cost and the like. With the development of large-scale hydrogen production equipment, the hydrogen production system gradually adopts a plurality of electrolytic tanks to share one set of gas-liquid separation system. In the long-term operation process of the electrolytic tank, the membrane is easy to cause problems, so that the danger of explosion caused by mixing of hydrogen generated by electrolysis of water and oxygen exists, and therefore, the concentration of hydrogen in the oxygen of the gas at the outlet of the electrolytic tank needs to be detected. However, the existing hydrogen production system can only realize intermittent detection of the purity of the gas at the outlet of the electrolytic tank, so that the detection result of the gas at the outlet of the electrolytic tank is lagged, and certain potential safety hazard exists in the hydrogen production system.

Disclosure of Invention

The utility model provides a hydrogen production system, which is used for realizing continuous detection of gas at an outlet of an electrolytic cell in the hydrogen production system, obtaining a purity detection result with higher timeliness and improving the safety of the hydrogen production system.

According to an aspect of the present utility model, there is provided a hydrogen production system including: an electrolysis cell and a gas purity detection bypass connected to the electrolysis cell;

the gas purity detection bypass includes: a gas-liquid separation module and a purity detection module; the electrolytic tank is connected with the gas-liquid separation module through a first pipeline; the gas-liquid separation module is connected with the purity detection module through a second pipeline;

the purity detection module is used for continuously detecting the hydrogen content in oxygen or the hydrogen content in the sampling gas of the electrolytic tank

Oxygen content in hydrogen.

Optionally, the hydrogen production system further comprises: at least two electrolytic cells and at least two gas purity detection bypasses; wherein, each gas purity detection bypass is connected with each electrolytic tank in a one-to-one correspondence.

Optionally, the hydrogen production system further comprises: a gas cooling module;

each second pipeline is connected with the gas cooling module in a converging way, and the gas cooling module is used for cooling the sampling gas of each electrolytic tank.

Optionally, the gas cooling module comprises: a cold collector and at least two temperature detectors;

the input end of the cold collector is connected with a third pipeline, and a first switch valve is arranged on the third pipeline; the first switch valve is used for controlling the third pipeline to be conducted so as to inject cooling water into the cold collector;

the gas-liquid separation module is connected to the upstream of the first switch valve through a fourth pipeline, and the fourth pipeline is provided with a second switch valve; the second switch valve is used for controlling the fourth pipeline to be conducted so as to enable cooling water to be transmitted to the gas-liquid separation module;

each temperature detector is arranged on the corresponding second pipeline at the downstream of the cold collector in a one-to-one correspondence manner and is used for detecting the temperature of the sampling gas of the corresponding electrolytic tank.

Optionally, the purity detection module includes: a purity analyzer and a manual sampling interface;

the purity analyzer is connected to the second pipeline and is used for detecting the content of hydrogen in oxygen or the content of oxygen in hydrogen in the sampling gas of the corresponding electrolytic tank;

the manual sampling interface is connected between the purity analyzer and the input end of the purity detection module and is used for collecting sampling gas for external purity detection.

Optionally, a third switch valve is arranged between the temperature detector and the manual sampling interface;

and the third switch valve is used for controlling the sampling gas of the electrolytic tank to enter the purity analyzer for detection through the second pipeline when the temperature of the sampling gas of the electrolytic tank is lower than a temperature threshold value.

Optionally, a fifth pipeline is connected between the temperature detector on the second pipeline and the third switch valve, the fifth pipeline is connected to a deoxidized gas scrubber pipeline, and a fourth switch valve is arranged on the fifth pipeline;

the fourth switch valve is used for controlling cooling water to circulate to the oxygen scrubber through the fifth pipeline when the cooling water inflow of the cold collector is regulated.

Optionally, the hydrogen production system further comprises: a controller;

the controller is connected with each purity analyzer, and the controller is connected with each electrolytic tank; the controller is used for receiving the detection data transmitted by each purity analyzer and controlling the corresponding electrolytic tank to stop according to the detection data.

Optionally, the gas-liquid separation module includes: a gas-liquid separator and a liquid level gauge;

the liquid level meter is connected with the gas-liquid separator and is used for detecting the liquid level height inside the gas-liquid separator;

the gas-liquid separator is connected with an alkali liquor converging pipeline through a sixth pipeline, and a fifth switch valve is arranged on the sixth pipeline; and the fifth switch valve is used for controlling the sixth pipeline to be conducted when the liquid level of the gas-liquid separator reaches a liquid level threshold value so as to discharge the alkali liquor in the gas-liquid separator to the alkali liquor converging pipeline.

Optionally, the hydrogen production system further comprises: an alkali liquor transfer pump;

the alkali liquor transfer pump is connected to the alkali liquor collecting pipeline and is used for providing auxiliary power for alkali liquor so as to enable the alkali liquor to be collected into the oxygen scrubber.

Optionally, the hydrogen production system further comprises: a system purification module; the system purge module includes: a nitrogen displacement source;

the nitrogen replacement source is connected with the first pipeline through a seventh pipeline; the nitrogen displacement source is used for injecting nitrogen into the first pipeline through the seventh pipeline so as to remove air in the hydrogen production system.

In the hydrogen production system provided by the embodiment of the utility model, the electrolytic tank is connected with a gas purity detection bypass. The gas purity detection bypass comprises a gas-liquid separation module and a purity detection module. The electrolytic tank is connected with the gas-liquid separation module through a first pipeline, so that continuous sampling of gas generated by the electrolytic tank can be realized, and sampled gas is obtained. The sampling gas of the electrolytic tank is conveyed to the purity detection module through the second pipeline, so that the purity detection module can carry out timely and continuous purity detection on the sampling gas of the electrolytic tank, a purity detection result with higher timeliness is obtained, and the safety of the hydrogen production system is improved.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a hydrogen production system provided in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic diagram of yet another hydrogen production system provided in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic diagram of yet another hydrogen production system provided in accordance with an embodiment of the present utility model;

FIG. 4 is a schematic diagram of yet another hydrogen production system provided in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic diagram of yet another hydrogen production system provided in accordance with an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of yet another hydrogen production system provided in accordance with an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The embodiment of the utility model provides a hydrogen production system. FIG. 1 is a schematic diagram of a hydrogen production system according to an embodiment of the present utility model. As shown in fig. 1, the hydrogen production system 100 includes: an electrolytic cell 10 and a gas purity detection bypass 101, the gas purity detection bypass 101 being connected to the electrolytic cell 10.

The gas purity detection bypass 101 includes: a gas-liquid separation module 20 and a purity detection module 30; the electrolytic tank 10 is connected with the gas-liquid separation module 20 through a first pipeline 11; the gas-liquid separation module 20 is connected with the purity detection module 30 through a second pipeline 12; the purity detection module 30 is used to continuously detect the hydrogen content of the oxygen or the oxygen content of the hydrogen in the sample gas of the electrolytic cell 10.

Where the purity of the sample gas of the electrolytic cell 10 is detected to ensure the safety of the hydrogen production system, for example, when the sample gas is oxygen, the detection of the hydrogen content in the oxygen may be performed on the oxygen; when the sampling gas is hydrogen, the oxygen content in the hydrogen can be detected. In the embodiment of the utility model, the hydrogen production system is described by taking the sample gas as oxygen and detecting the hydrogen content in the oxygen of the oxygen as an example. After the electrolytic tank 10 is started, hydrogen and oxygen are respectively generated on two sides of a diaphragm inside the electrolytic tank 10 through an alkaline water electrolysis hydrogen production technology, the generated hydrogen is output to a hydrogen scrubber through a hydrogen main pipeline connected to an outlet of the electrolytic tank 10 for subsequent treatment, and the generated oxygen is output to the oxygen scrubber through an oxygen main pipeline 103 connected to the outlet of the electrolytic tank 10 for subsequent treatment. In fig. 1, only the main oxygen line 103 connected to the outlet of the electrolyzer 10 is shown to illustrate the technical effect of the hydrogen production system. One end of a first pipeline 11 between the gas-liquid separation module 20 and the electrolytic tank 10 in each gas purity detection bypass 101 is connected to the oxygen main pipeline 103, and the other end is connected to the input end of the gas-liquid separation module 20, so as to realize the effect of sampling a small amount of oxygen generated in the electrolytic tank 10. The first pipeline 11 may also be referred to as sampling pipeline, for example. In the embodiment of the present utility model, the effect of continuously sampling the oxygen generated by each electrolytic cell 10 can be achieved by the first pipeline 11 and the gas-liquid separation module 20 in the gas purity detection bypass 101 connected in one-to-one correspondence with each electrolytic cell 10.

The output end of the gas-liquid separation module 20 is connected with the purity detection module 30 through the second pipeline 12, so that the sample gas of the electrolytic tank 10 is washed and separated by the gas-liquid separation module 20 and then is output to the purity detection module 30, and the purity detection module 30 can timely and continuously detect the purity of the sample gas of the electrolytic tank 10. Illustratively, in an embodiment of the present utility model, the hydrogen production system 100 safety is improved by detecting the hydrogen content of the oxygen in the sampled gas to determine whether the membrane in the corresponding electrolyzer 10 is damaged, thereby shutting down the malfunctioning electrolyzer 10 for maintenance.

Illustratively, FIG. 2 is a schematic structural diagram of yet another hydrogen production system provided in accordance with an embodiment of the present utility model. As shown in fig. 2, the hydrogen production system 100 provided by the embodiment of the present utility model may further include at least two electrolytic tanks 10 and at least two gas purity detection bypasses 101, where each gas purity detection bypass 101 is connected to each electrolytic tank 10 in a one-to-one correspondence manner, so as to perform continuous purity detection on the sampled gas of the corresponding electrolytic tank 10. Each gas purity detection bypass 101 includes a gas-liquid separation module 20 and a purity detection module 30. Illustratively, the hydrogen production system 100 provided by the embodiment of the present utility model is illustrated as having a structure of four electrolytic cells 10 and four gas purity detection bypasses 101. A first pipeline 11 is connected between the gas-liquid separation module 20 and the electrolytic tank 10, and a second pipeline 12 is connected between the purity detection module 30 and the gas-liquid separation module 20. It should be noted that, in the drawings, the connection air paths of each electrolytic cell 10 and the gas-liquid separation module 20, the gas cooling module 40, and the purity detection module 30 are the same, and only in the drawings, reference numerals are added to the connection air path between one group of electrolytic cells 10 and the gas purity detection bypass 101 and the connection air path inside the gas purity detection bypass 101, and the rest air paths can refer to corresponding reference numerals, which will not be described in detail below. The hydrogen production system 100 with a plurality of electrolytic cells 10 can continuously obtain the sampling gas of the electrolytic cells 10 through the gas purity detection bypasses 101 correspondingly connected with the electrolytic cells 10 and perform purity detection on the sampling gas so as to ensure the safety of the hydrogen production system.

In the hydrogen production system 100 provided by the embodiment of the utility model, the electrolytic tank 10 is connected with a gas purity detection bypass 101. The gas purity detection bypass 101 includes a gas-liquid separation module 20 and a purity detection module 30. The electrolytic tank 10 is connected with the gas-liquid separation module 20 through the first pipeline 11, so that continuous sampling of the gas generated by the electrolytic tank 10 can be realized, and the sampled gas can be obtained. The sampled gas of the electrolytic tank 10 is conveyed to the purity detection module 30 through the second pipeline 12, so that the purity detection module 30 can perform timely and continuous purity detection on the sampled gas of the electrolytic tank 10, thereby obtaining a purity detection result with higher timeliness and improving the safety of the hydrogen production system 100.

Optionally, fig. 3 is a schematic structural diagram of yet another hydrogen production system provided in an embodiment of the present utility model. In addition to the above embodiments, as shown in fig. 3, the hydrogen production system further includes: a gas cooling module 40.

Each second line 12 is connected in a collective manner to a gas cooling module 40, the gas cooling module 40 being adapted to cool the sampled gas of each cell 10.

Illustratively, the second lines 12 in each gas purity detection bypass 101 are all collected at the gas cooling module 40, i.e., one end of all second lines 12 is connected to the output of the corresponding gas-liquid separation module 20, and after collection at the gas cooling module 40, the other end of all second lines 12 is connected to the input X of the corresponding purity detection module 30. By collecting the second pipelines 12 in all the gas purity detection bypasses 101 at the gas cooling module 40, the gas cooling module 40 can intensively cool the sampled gas of all the electrolytic cells 10 so as to reduce the temperature of the sampled gas of each electrolytic cell 10 to meet the detection requirement and then output the temperature to the purity detection module 30 for detecting the hydrogen content in oxygen, thereby reducing the cost investment of equipment such as a separate cooling pipeline, a valve and the like for each gas purity detection bypass 101.

Optionally, fig. 4 is a schematic structural diagram of yet another hydrogen production system provided in an embodiment of the present utility model. On the basis of the above embodiment, as shown in fig. 4, the gas cooling module 40 includes: a cold collector 41 and at least two temperature detectors 42.

The input end of the cold collector 41 is connected with a third pipeline 13, and a first switch valve 21 is arranged on the third pipeline 13; the first switching valve 21 is used to control the third line 13 to be turned on to inject cooling water into the cold collector 41.

The gas-liquid separation module 20 is connected upstream of the first on-off valve 21 through a fourth line 14, the fourth line 14 being provided with a second on-off valve 22; the second switch valve 22 is used for controlling the fourth pipeline 14 to be conducted so as to enable the cooling water to be transmitted to the gas-liquid separation module 20.

Each of the temperature detectors 42 is provided on the corresponding second line 12 downstream of the cold collector 41 in a one-to-one correspondence for detecting the temperature of the sampled gas of the corresponding electrolytic cell 10.

The input end of the cold collector 41 is connected to a third pipeline 13, and the on/off of the third pipeline 13 can be controlled by a first switch valve 21 arranged on the third pipeline 13, so that when the third pipeline 13 is on, cooling water is controlled to be input into the cold collector 41 through the third pipeline 13. The cold collector 41 performs concentrated cooling on the sampled gas output by each gas-liquid separation module 20, and the cooled sampled gas is still output from the corresponding second pipeline 12 to the gas cooling module 40. The temperature of the sampled gas is detected by respective temperature detectors 42 provided downstream of the cold collector 41 to obtain the temperature of the sampled gas of each of the electrolytic cells 10 after cooling. For example, the temperature detector 42 may be an online thermometer, and the temperature of the sampled gas may be acquired in time after the temperature data of the sampled gas is acquired.

In addition, the cooling water may be injected into the gas-liquid separation module 20 through the fourth line 14, and the fourth line 14 is connected upstream of the first switching valve 21, so that the state of the first switching valve 21 does not affect the injection of the cooling water into the gas-liquid separation module 20. The fourth pipeline 14 is provided with a second switch valve 22, and the cooling water is controlled to be injected into the gas-liquid separation module 20 through the second switch valve 22. That is, whether or not the cooling water is injected into the cold collector 41, the second switch valve 22 is controlled to be turned on, so that the cooling water is injected into the gas-liquid separation module 20, and the gas-liquid separation module 20 washes and separates the sampling gas.

Optionally, fig. 5 is a schematic structural diagram of yet another hydrogen production system provided in an embodiment of the present utility model. On the basis of the above embodiments, as shown in fig. 5, the purity detection module 30 includes: a purity analyzer 31 and a manual sampling interface 32.

A purity analyzer 31 is connected to the second line 12 for detecting the hydrogen content in oxygen or the oxygen content in hydrogen in the sample gas of the electrolytic cell 10; a manual sampling interface 32 is connected between the purity analyzer 31 and the input X of the purity detection module 30 for collecting sampled gas for external purity detection.

Illustratively, a third on-off valve 23 is disposed between each temperature detector 42 and the manual sampling interface 32; the third switch valve 23 is used for controlling the sample gas of the corresponding electrolytic cell 10 to enter the purity analyzer 31 for detection through the second pipeline 12 when the temperature of the sample gas of the corresponding electrolytic cell 10 is lower than the temperature threshold. Illustratively, in an embodiment of the present utility model, the purity analyzer 31 is a hydrogen-in-oxygen analyzer for detecting the purity of the oxygen sampling gas obtained from the electrolyzer 10. The purity analyzer 31 is connected downstream of the temperature detector 42, and is configured to control the third switch valve 23 to be turned on when the temperature of the sampled gas obtained by the temperature detector 42 meets the detection requirement, so that the sampled gas is transmitted to the purity analyzer 31 to detect the hydrogen content in oxygen. Wherein, whether the temperature of the sampling gas meets the detection requirement can be judged according to the first temperature threshold value and the second temperature threshold value. For example, if the first temperature threshold is smaller than the second temperature threshold, and the temperature of the sampled gas detected by the temperature detector 42 is smaller than the first temperature threshold, it indicates that the temperature of the sampled gas meets the detection requirement, and the sampled gas may be input into the purity analyzer 31 for purity detection. If the temperature of the sampled gas detected by the temperature detector 42 is greater than the first temperature threshold and less than the second temperature threshold, the temperature of the sampled gas is analyzed for a detection period. If the temperature of the sampling gas continuously rises in a period of detection time, the temperature of the sampling gas is higher, and the sampling gas needs to be continuously cooled; if the temperature of the sampled gas does not continuously rise within a period of detection time, the temperature of the sampled gas may be reduced, or the temperature of the sampled gas fluctuates around the temperature value detected for the first time, which indicates that there may be false detection of the temperature value detected for the first time, and the temperature of the sampled gas satisfies the detection requirement, and the purity detection may be performed. If the temperature of the sampled gas detected by the temperature detector 42 is greater than the second temperature threshold, then this indicates that the temperature is too high and cooling is continued. The first temperature threshold and the second temperature threshold may be set by the user according to actual needs, which is not limited herein.

The manual sampling interface 32 is arranged between the third switch valve 23 and the purity analyzer 31, and can provide an interface for a user to manually obtain the sampling gas after the cold collector 41 cools the temperature of the sampling gas to meet the detection requirement, so that the sampling gas is sent to an external purity detection device for detecting the hydrogen content in oxygen when the purity analyzer 31 detects deviation or failure; or the sampling gas can be detected again by using the external purity detection equipment in addition to the detection by using the purity analyzer 31, and the two detection results obtained by the purity analyzer 31 and the external purity detection equipment are comprehensively analyzed, so that a more accurate detection result of the hydrogen content in oxygen is obtained, and the safety of the hydrogen production system 100 is further improved.

Optionally, with continued reference to fig. 5, based on the above embodiments, a fifth line 15 is connected between the temperature detector 42 on the second line 12 and the third switch valve 23, the fifth line 15 is connected to the deoxidized gas scrubber line 101, and a fourth switch valve 24 is provided on the fifth line 15.

The fourth switching valve 24 is used to control the circulation of cooling water to the oxygen scrubber through the fifth line 15 when the inflow of cooling water to the cold trap 41 is adjusted.

The direction of the sampled gas cooled by the cold collector 41 in the second pipeline 12 can be controlled by controlling the conducting state of the fourth switch valve 24 on the fifth pipeline 15. For example, if the third switch valve 23 is turned on and the fourth switch valve 24 is turned off, the sampled gas in the second pipeline 12 is cooled by the cold collector 41 and then is transmitted to the purity analyzer 31 for purity detection; if the third switch valve 23 is turned off and the fourth switch valve 24 is turned on, the sampled gas in the second pipeline 12 is cooled by the cold collector 41 and then is transmitted to the deoxidized gas scrubber pipeline 101 through the fifth pipeline 15, and is converged to the oxygen scrubber for subsequent circulation treatment. Wherein fig. 5 of an embodiment of the present utility model does not show the system after the sample analysis portion of hydrogen production system 100, and therefore, the oxygen scrubber is not shown.

It should be noted that, the case where the third switch valve 23 is turned off and the fourth switch valve 24 is turned on is often applied to a scenario where the amount of cooling water in the cold collector 41 is adjusted before the hydrogen production system 100 is first used, so that the temperature of the sampled gas after being cooled by the cold collector 41 meets the detection requirement. Therefore, when the cooling water amount of the cold collector 41 is adjusted, the sampled gas in the second line 12 can be converged by the fourth switch valve 24 to the deoxidized gas scrubber line 101 through the fifth line 15, and finally output to the oxygen scrubber. And continuously detecting the temperature of the sampling gas in the process of conveying the sampling gas, regulating the cooling water quantity in the cold collector 41 according to the temperature data of the sampling gas until the cooling water quantity in the cold collector 41 can reduce the temperature of the sampling gas to meet the purity detection requirement, and closing the fourth switch valve 24. The sampling gas used in adjusting the cooling water amount in the cold collector 41 may be oxygen generated by the electrolytic cell 10 without failure, that is, oxygen having a hydrogen content of zero or a hydrogen content of oxygen within an allowable safety range, so that the safety of the entire hydrogen production system 100 during the adjustment process may be ensured.

Optionally, with continued reference to fig. 5, in accordance with the above embodiments, the hydrogen production system 100 further includes: and a controller 50. The controller 50 is connected to each purity analyzer 31, and the controller 50 is connected to each electrolytic cell 10; the controller 50 is used for receiving the detection data transmitted by each purity analyzer 31 and controlling the corresponding electrolytic cell 10 to stop according to the detection data.

The controller 50 is illustratively connected to each purity analyzer 31 and each electrolyzer 10 by a wired connection to effect signal transmission. Wherein the wired connection between the controller 50 and each cell 10 is not shown in fig. 5. After the purity detection data of the sample gas of each electrolytic cell 10 is detected by each purity analyzer 31, each purity detection data is transmitted to the controller 50. The purity detection data of the sampled gas of the corresponding electrolytic cell 10 is analyzed by the controller 50, and if the hydrogen content in the oxygen exceeds the content threshold value according to certain purity detection data, the electrolytic cell 10 corresponding to the purity detection data is indicated to be in fault. For example, the threshold value of the hydrogen content in oxygen may be set by the user according to the actual safety requirements, without limitation. Accordingly, the controller 50 may transmit a control signal to the corresponding malfunctioning cell 10 according to the analysis result of the purity detection data to control the cell 10 to be stopped and to wait for maintenance. By analyzing the purity detection data obtained by continuously sampling and continuously detecting the sampled gas, the safety of hydrogen production system 100 is effectively improved.

Alternatively, FIG. 6 is a schematic structural diagram of yet another hydrogen production system provided by an embodiment of the present utility model. On the basis of the above embodiments, as shown in fig. 6, the gas-liquid separation module 20 includes: a gas-liquid separator 21 and a level gauge 22.

The liquid level meter 22 is connected to the gas-liquid separator 21 and is used for detecting the liquid level inside the gas-liquid separator 21; the gas-liquid separator 21 is connected with an alkali liquor confluence pipeline 102 through a sixth pipeline 16, and a fifth switch valve 25 is arranged on the sixth pipeline 16; the fifth switch valve 25 is used for controlling the sixth pipeline 16 to be conducted when the liquid level of the gas-liquid separator 21 reaches the liquid level threshold value, so as to discharge the alkali liquor in the gas-liquid separator 21 to the alkali liquor confluence pipeline 102.

Wherein, the cooling water is injected into the gas-liquid separator 21 in the form of spray, and the sample gas of the corresponding electrolytic cell 10 inputted into the gas-liquid separator 21 is washed to remove alkali. After the washing is finished, the sampling gas is separated from the alkali liquor. The sampled gas is output from the output of the gas-liquid separator 21 to the second line 12, and the lye is pre-stored in the gas-liquid separator 21. The gas-liquid separator 21 is also connected with a liquid level meter 22, and the liquid level meter 22 can detect the liquid level of the alkali liquor in the gas-liquid separator 21 and compare with a liquid level threshold value to control the liquid level in the gas-liquid separator 21. For example, the liquid level threshold may be set by the user according to actual needs, without limitation. The liquid level meter 22 may be a remote transmission liquid level meter, and transmits the liquid level data to a user side after acquiring the liquid level height data in the gas-liquid separator 21, so that the user can adjust the liquid level height in the gas-liquid separator 21 in time, and the liquid level in the gas-liquid separator 21 is prevented from being too high.

The gas-liquid separator 21 is connected to the sixth pipeline 16, and the alkali liquor in the gas-liquid separator 21 can be controlled to be discharged from the sixth pipeline 16 by adjusting the conduction state of the fifth switch valve 25 provided on the sixth pipeline 16. Illustratively, when the level gauge 22 detects that the liquid level inside the gas-liquid separator 21 reaches the liquid level threshold, the level gauge 22 instructs the user to open the fifth switch valve 25, to allow the lye in the gas-liquid separator 21 to be converged to the lye converging line 102 through the sixth line 16 until the liquid level in the gas-liquid separator 21 reaches a lower liquid level, and to close the fifth switch valve 25.

Optionally, with continued reference to fig. 6, based on the above embodiments, the hydrogen production system 100 further includes: lye transfer pump 60.

The lye transfer pump 60 is connected to a lye confluence line 102 for providing auxiliary power to the lye for confluence to the oxygen scrubber.

Wherein, the alkali liquor discharged from the gas-liquid separator 21 can be transferred to the oxygen scrubber by utilizing the gravity of the alkali liquor by the alkali liquor converging line 102. Since the arrangement of the lye confluence line 102 may have a certain height difference with respect to the gas-liquid separator 21, the lye discharged from the gas-liquid separator 21 cannot be output to the oxygen scrubber by using its own gravity, and thus, auxiliary power can be provided for lye transmission by the lye transfer pump 60. The lye transfer pump 60 is disposed downstream of the connection point of each sixth pipeline 16 and the lye confluence pipeline 102, so as to provide auxiliary power for the lye discharged from each gas-liquid separator 21, and confluence the lye into the oxygen scrubber.

Optionally, with continued reference to fig. 6, based on the above embodiments, the hydrogen production system 100 further includes: a system purge module 70. The system purge module includes 70: the nitrogen gas replaces source 71.

The nitrogen gas replacement source 71 is connected to the first line 11 through the seventh line 17; nitrogen displacement source 71 is used to inject nitrogen into first line 11 via seventh line 17 to purge air from hydrogen production system 100.

Specifically, before starting up the electrolytic tank 10, the system purification module 70 outputs inert gas to the hydrogen production system 100 through the first pipeline 11 to exhaust air in each device and pipeline in the hydrogen production system 100, so as to facilitate reducing the detection result of the air in the system on the hydrogen content in the oxygen of the sampling gas, and improve the detection accuracy.

Before the electrolytic tank 10 is started, the nitrogen gas substitution source 71 outputs nitrogen gas, the fourth switching valve 24 is adjusted to the on state, and the second switching valve 22, the third switching valve 23, the fifth switching valve 25, and the sixth switching valve 26 are adjusted to the off state. The sixth switching valve 26 is a valve disposed on the first pipeline 11, and is used for controlling the sampled gas obtained by each electrolytic cell 10 to be transmitted to the corresponding gas-liquid separator 21. The nitrogen is transferred to the first pipeline 11 through the seventh pipeline 17, enters the gas-liquid separator 21, is transferred to the second pipeline 12, is finally converged to the deoxidized gas scrubber pipeline through the fifth pipeline 15, and is output to the oxygen scrubber, so that the main gas transmission path in the hydrogen production system 100 is purified, and the accuracy of the purity detection result is improved.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (11)

1. A hydrogen production system, comprising: an electrolysis cell and a gas purity detection bypass connected to the electrolysis cell;

the gas purity detection bypass includes: a gas-liquid separation module and a purity detection module; the electrolytic tank is connected with the gas-liquid separation module through a first pipeline; the gas-liquid separation module is connected with the purity detection module through a second pipeline;

the purity detection module is used for continuously detecting the content of hydrogen in oxygen or the content of oxygen in hydrogen in the sampling gas of the electrolytic tank.

2. The hydrogen production system of claim 1, further comprising: at least two electrolytic cells and at least two gas purity detection bypasses; wherein, each gas purity detection bypass is connected with each electrolytic tank in a one-to-one correspondence.

3. The hydrogen production system of claim 2, further comprising: a gas cooling module;

each second pipeline is connected with the gas cooling module in a converging way, and the gas cooling module is used for cooling the sampling gas of each electrolytic tank.

4. The hydrogen production system of claim 3, wherein the gas cooling module comprises: a cold collector and at least two temperature detectors;

the input end of the cold collector is connected with a third pipeline, and a first switch valve is arranged on the third pipeline; the first switch valve is used for controlling the third pipeline to be conducted so as to inject cooling water into the cold collector;

the gas-liquid separation module is connected to the upstream of the first switch valve through a fourth pipeline, and the fourth pipeline is provided with a second switch valve; the second switch valve is used for controlling the fourth pipeline to be conducted so as to enable cooling water to be transmitted to the gas-liquid separation module;

each temperature detector is arranged on the corresponding second pipeline at the downstream of the cold collector in a one-to-one correspondence manner and is used for detecting the temperature of the sampling gas of the corresponding electrolytic tank.

5. The hydrogen production system of claim 4, wherein the purity detection module comprises: a purity analyzer and a manual sampling interface;

the purity analyzer is connected to the second pipeline and is used for detecting the hydrogen content in oxygen or the oxygen content in hydrogen of the sampling gas of the electrolytic tank;

the manual sampling interface is connected between the purity analyzer and the input end of the purity detection module and is used for collecting sampling gas for external purity detection.

6. The hydrogen production system of claim 5, wherein a third on-off valve is disposed between the thermometer and the manual sampling interface;

and the third switch valve is used for controlling the sampling gas of the electrolytic tank to enter the purity analyzer for detection through the second pipeline when the temperature of the sampling gas of the electrolytic tank is lower than a temperature threshold value.

7. The hydrogen production system of claim 6, wherein,

a fifth pipeline is connected between the temperature detector on the second pipeline and the third switch valve, the fifth pipeline is connected to an oxygen scrubber pipeline, and a fourth switch valve is arranged on the fifth pipeline;

the fourth switch valve is used for controlling cooling water to circulate to the oxygen scrubber through the fifth pipeline when the cooling water inflow of the cold collector is regulated.

8. The hydrogen production system of claim 5, further comprising: a controller;

the controller is connected with each purity analyzer, and the controller is connected with each electrolytic tank; the controller is used for receiving the detection data transmitted by each purity analyzer and controlling the corresponding electrolytic tank to stop according to the detection data.

9. The hydrogen production system of claim 1, wherein the gas-liquid separation module comprises: a gas-liquid separator and a liquid level gauge;

the liquid level meter is connected with the gas-liquid separator and is used for detecting the liquid level height inside the gas-liquid separator;

the gas-liquid separator is connected with an alkali liquor converging pipeline through a sixth pipeline, and a fifth switch valve is arranged on the sixth pipeline; and the fifth switch valve is used for controlling the sixth pipeline to be conducted when the liquid level of the gas-liquid separator reaches a liquid level threshold value so as to discharge the alkali liquor in the gas-liquid separator to the alkali liquor converging pipeline.

10. The hydrogen production system of claim 9, further comprising: an alkali liquor transfer pump;

the alkali liquor transfer pump is connected to the alkali liquor collecting pipeline and is used for providing auxiliary power for alkali liquor so as to enable the alkali liquor to be collected into the oxygen scrubber.

11. The hydrogen production system of claim 1, further comprising: a system purification module; the system purge module includes: a nitrogen displacement source;

the nitrogen replacement source is connected with the first pipeline through a seventh pipeline; the nitrogen displacement source is used for injecting nitrogen into the first pipeline through the seventh pipeline so as to remove air in the hydrogen production system.