CN217628657U - Hydrogen production system - Google Patents

Abstract

The application provides a hydrogen production system, at least two electrolytic cells are connected in series between the positive electrode and the negative electrode of the output end of a hydrogen production power supply, so that the number of the hydrogen production power supplies in the system can be reduced, and the corresponding equipment cost is saved; moreover, after the corresponding electrolytic cells are connected in series, the connection between the corresponding electrolytic cells and the anode and the cathode of the output end of the hydrogen production power supply is realized through the anode and cathode cables, so that the number of the cables connected between the electrolytic cells and the hydrogen production power supply is reduced, and the use cost of the cables in the system is reduced. In addition, the output voltage grade of the hydrogen production power supply is improved, the using number of cables is reduced, the transmission loss of the cables can be reduced, and the efficiency of the whole system is improved.

Description

Hydrogen production system

Technical Field

The application relates to the technical field of hydrogen production, in particular to a hydrogen production system.

Background

At present, the carbon peak reaching and carbon neutralization development targets are provided in China, and the carbon reduction process is further accelerated. Hydrogen is used as a zero-carbon energy carrier, plays an indispensable role in energy transformation, and particularly has great potential for generating green hydrogen by renewable energy.

However, in the present stage, the production cost of green hydrogen is much higher than that of grey hydrogen obtained from power grid, on one hand, the cost of electricity generated by new energy is higher, and on the other hand, the cost of hydrogen production equipment is relatively higher. And the high cost limits the wide popularization and application of large-scale hydrogen production by renewable energy sources.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides a hydrogen production system, which can reduce the cost of the whole hydrogen production system by modifying the system design.

In order to achieve the above purpose, the present application provides the following technical solutions:

the present application provides a hydrogen production system comprising: at least one hydrogen production power supply, at least two electrolysis baths and a post-treatment unit; wherein the content of the first and second substances,

at least two electrolytic tanks are connected in series between the anode and the cathode of the output end of the hydrogen production power supply;

and the gas outlets of the electrolytic cells are respectively connected into the post-treatment unit.

Optionally, the rated output voltage of the hydrogen production power supply is less than or equal to the sum of the rated input voltages of the electrolysis cells connected to the output end of the hydrogen production power supply;

the rated output current of the hydrogen production power supply is less than or equal to the minimum value of the rated input currents of the electrolytic cells connected with the output end of the hydrogen production power supply.

Optionally, the number of the hydrogen production power supplies is greater than 1, and the rated output parameters of the hydrogen production power supplies are the same.

Optionally, the number of the electrolytic cells connected to each hydrogen production power supply is 2.

Optionally, rated input parameters of the electrolysis cells connected to the same hydrogen production power supply are the same.

Optionally, the hydrogen production power supply is an AC/DC converter, and an input end of the AC/DC converter is connected to the wind power generation module or the power grid;

the hydrogen production power supply is a DC/DC converter, and the input end of the hydrogen production power supply is connected with the photovoltaic power generation module.

Optionally, the hydrogen gas outlets of the electrolytic cells are collected by a hydrogen gas transmission gas pipeline and then connected to the hydrogen gas access port of the post-processing unit;

and the oxygen gas outlets of the electrolytic cells are collected through an oxygen gas transmission pipeline and then are connected into the oxygen access port of the post-treatment unit.

Optionally, the post-processing unit includes: at least one post-processing device;

the gas outlets of the electrolysis baths connected with the same hydrogen production power supply are respectively merged into the same corresponding post-treatment device.

Optionally, the electrolytic cell is: an alkaline water electrolyzer, or a proton exchange membrane electrolyzer.

Optionally, the gas outlet mode of the electrolytic cell is end plate gas outlet.

According to the hydrogen production system, at least two electrolytic cells are connected in series between the positive electrode and the negative electrode of the output end of the hydrogen production power supply, so that the number of the hydrogen production power supplies in the system can be reduced, and the corresponding equipment cost is saved; moreover, after the corresponding electrolytic cells are connected in series, the connection between the corresponding electrolytic cells and the anode and the cathode of the output end of the hydrogen production power supply is realized through the anode and cathode cables, so that the number of the cables connected between the electrolytic cells and the hydrogen production power supply is reduced, and the use cost of the cables in the system is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art hydrogen production system;

FIG. 2 is a schematic diagram of a hydrogen production system provided by an embodiment of the present application;

FIG. 3a is a schematic diagram of the connection between the electrolyzer and the hydrogen production power supply in a hydrogen production system provided by the prior art;

FIG. 3b is a schematic diagram of the connection between the electrolyzer and the hydrogen production power source in the hydrogen production system provided by the embodiment of the present application;

FIG. 4 is a specific structural diagram of a hydrogen production system provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of another configuration of a hydrogen production system provided in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

At present, in the water electrolysis hydrogen production industry, the gas-liquid mixture (including H) output by all the electrolytic cells is generally ₂ Gas-liquid and O ₂ Gas-liquid) and then the post-treatment of unified gas-liquid separation is carried out, and the structure is shown in figure 1; the design scheme of the system expands the traditional mode that one electrolytic cell is provided with one set of gas-liquid treatment equipment into the mode that a plurality of electrolytic cells share one set of post-treatment equipmentThe method can effectively reduce the cost of the hydrogen production system.

However, for the energy input source of the electrolytic cell, the prior art adopts one electrolytic cell and one hydrogen production power supply, and no scheme for controlling the cost from the hydrogen production power supply and a corresponding connecting cable is provided.

According to the system, the design of the system is changed, at least two electrolytic tanks are connected in series for use in a series connection mode, and the cost of a hydrogen production power supply and the cost of a corresponding connecting cable can be reduced, so that the overall cost of the hydrogen production system is reduced.

Specifically, as shown in fig. 2, the present application provides a hydrogen production system comprising: at least one hydrogen production power supply 101, at least two electrolysis cells 102 and a post-treatment unit 103; wherein:

at least two electrolytic tanks 102 are connected in series between the positive and negative electrodes (DC + and DC-) at the output end of the hydrogen production power supply 101; the number of the electrolysis cells 102 connected with the hydrogen production power supply 101 is not limited, and is only larger than 1, and the number is within the protection scope of the application.

In practice, the cells 102 in the system are vented from the end plates so that the cells 102 can be connected in series.

The gas outlet of each electrolytic cell 102 is respectively connected to a post-processing unit 103; in practical applications, each electrolytic cell 102 may share a set of post-treatment equipment for gas-liquid separation, i.e. the post-treatment unit 103 only includes a set of post-treatment devices (as shown in fig. 2); alternatively, each electrolytic cell 102 may be provided with its own corresponding post-treatment device; depending on the specific application environment, are all within the scope of the present application.

In the hydrogen production system provided by the embodiment, at least two electrolytic cells 102 are connected in series between the anode and the cathode of the output end of the hydrogen production power supply 101, so that the number of the hydrogen production power supplies 101 in the system can be reduced, and the corresponding equipment cost is saved.

It is worth to be noted that, according to the requirements of the design specifications of the hydrogen station, the peripheries of the electrolytic tanks and the corresponding hydrogen production equipment belong to explosion-proof areas, and the hydrogen production power supplies are generally designed to be non-explosion-proof, so that the hydrogen production power supplies need to be placed in the non-explosion-proof areas, which results in that very long connecting cables are required between each electrolytic tank and the corresponding hydrogen production power supplies (fig. 3a shows two electrolytic tanks as an example); furthermore, the cost of the cables is high, since the cells generally require a high input of current.

In the hydrogen production system provided by this embodiment, the corresponding electrolytic cell 102 is connected in series to the positive and negative electrodes of the output end of the corresponding hydrogen production power supply 101 through the positive and negative cables, so that the number of cables connected between the electrolytic cell 102 and the hydrogen production power supply 101 is reduced in this embodiment; fig. 3b also shows two electrolysis cells 102 as an example, and it can be seen that only two sets of cables are needed from the hydrogen production power source 101 to the two electrolysis cells 102 in the hydrogen production system provided by this embodiment, and the number of cables is half of that in the case shown in fig. 3 a; when the hydrogen production power supply 101 is provided with a larger number of electrolysis cells 102, the more cables can be saved, and the corresponding cost reduction range is larger. That is, the present embodiment can reduce the cable use cost in the system.

In addition, because the number of cables is reduced, the loss through each cable is correspondingly reduced in the hydrogen production system provided by the embodiment.

From the above, it can be seen that the present embodiment not only can reduce the cost of the hydrogen production system, but also can reduce the energy consumption of the system.

In practical applications, the electrolytic cell 102 may be an alkaline water electrolytic cell, or may also be a proton exchange membrane electrolytic cell, or may also be a similar hydrogen production process electrolytic cell, depending on the specific application environment, and is within the protection scope of the present application.

On the basis of the above embodiment, this embodiment provides a preferable solution, and referring to fig. 4, the hydrogen production system including 4 electrolytic cells is described as an example:

the anode of the output end of the hydrogen production power supply A is connected with the anode input end of the No. 1 electrolytic cell; the negative electrode end of the No. 1 electrolytic cell is connected with the positive electrode input end of the No. 2 electrolytic cell; the negative electrode end of the No. 2 electrolytic tank is connected with the negative electrode of the output end of the hydrogen power supply A.

The anode of the output end of the hydrogen production power supply B is connected with the anode input end of the 3# electrolytic cell; the negative electrode end of the No. 3 electrolytic cell is connected with the positive electrode input end of the No. 4 electrolytic cell; the negative electrode end of the No. 4 electrolytic cell is connected with the negative electrode of the output end of the hydrogen power supply B.

Assuming that the rated input parameters of the electrolytic cells connected to the same hydrogen production power supply are the same, namely, the rated input voltage and the rated input current of the two electrolytic cells connected in series in fig. 4 are respectively and correspondingly the same, when the hydrogen production power supplies a and B output power, the input power of the 1# electrolytic cell and the 2# electrolytic cell is the same and is half of the output power of the hydrogen production power supply a; the 3# electrolytic cell and the 4# electrolytic cell have the same input power and are half of the output power of the hydrogen production power supply B.

Because a mode of connecting the double electrolytic cells in series is adopted, the rated output voltage of the hydrogen production power supply A is the sum of the rated input voltage of the No. 1 electrolytic cell and the rated input voltage of the No. 2 electrolytic cell; similarly, the rated output voltage of the hydrogen production power supply B is the sum of the rated input voltage of the 3# electrolytic cell and the rated input voltage of the 4# electrolytic cell. The rated output current of the hydrogen production power supply is the same as the rated input current of the electrolytic cell connected in series with the hydrogen production power supply.

It should be noted that, in practical application, the rated input parameters of the two electrolysis cells connected in series may also be different, so that the rated output voltage of the hydrogen production power supply should not be greater than the sum of the rated input voltages of the two electrolysis cells connected in series, and the rated output current of the hydrogen production power supply should not be greater than the rated input current of the smaller one of the two electrolysis cells.

Namely, the rated output voltage of the hydrogen production power supply is less than or equal to the sum of the rated input voltages of all electrolytic tanks connected with the output end of the hydrogen production power supply; the rated output current of the hydrogen production power supply is less than or equal to the minimum value of the rated input currents of all the electrolytic tanks connected with the output end of the hydrogen production power supply; the rated output parameters of the hydrogen production power supply are set according to the specific application environment, and are all within the protection scope of the application.

In addition, in practical application, when the number of the hydrogen production power supplies is more than 1, the rated output parameters of the hydrogen production power supplies can be the same or different; the rated output parameters of the hydrogen production power supplies are the same, so that the large-scale setting of the hydrogen production stations is facilitated; the rated output parameters of the hydrogen production power supplies are different, so that the actual conditions of the hydrogen production station can be better met, for example, when the number of the electrolytic cells in the hydrogen production station cannot be evenly distributed to the hydrogen production power supplies, the rated output parameters of the individual hydrogen production power supplies can be allowed to be different; therefore, the rated output parameter setting of each hydrogen production power supply is not limited, and the rated output parameters are determined according to the specific application environment and are within the protection range of the application.

In addition, in the actual operation process, the input power of each hydrogen production power supply is scheduled by the upper controller, and the scheduling power received by the hydrogen production power supply A and the hydrogen production power supply B can be the same or different, and is determined according to the actual situation and is within the protection scope of the application.

In the scheme shown in fig. 4, two electrolytic tanks are connected in series and connected with a hydrogen production power supply, the level of the direct-current voltage output by the hydrogen production power supply is improved, the number of the hydrogen production power supplies in the whole system is reduced, and the cost of the hydrogen production power supplies in the whole system is reduced.

It should be noted that fig. 4 only shows 4 electrolytic cells in the system as an example, and in practical application, the electrolytic cells can be expanded to N electrolytic cells, where N is an integer greater than 4; at this time, the number of the hydrogen production power supplies can still be half of that of the electrolysis bath, namely the number of the electrolysis bath is 2 times of that of the hydrogen production power supplies, but the invention is not limited to this, and each hydrogen production power supply can also be connected with more electrolysis baths; even the number of the electrolytic cells connected with each hydrogen production power supply can be different, and as mentioned above, each hydrogen production power supply can be connected with a corresponding number of electrolytic cells according to the condition of the rated output parameter of the power supply.

In addition, in the embodiment, the electrolytic tanks are used in series, so that connecting cables between the hydrogen production power supply and the electrolytic tanks can be reduced, and the use cost of cables of the whole system is reduced. Meanwhile, the output voltage grade of the hydrogen production power supply is improved, the using number of cables is reduced, the transmission loss of the cables can be reduced, and the efficiency of the whole system is improved.

On the basis of the above-mentioned embodiment, each electrolytic cell 102 may share one set of post-treatment equipment for gas-liquid separation, i.e. the post-treatment unit 103 may only include one set of post-treatment equipment (as shown in fig. 2 and 4), and in this case:

the hydrogen gas outlet of each electrolytic cell 102 is connected to the hydrogen gas access port of the post-processing unit 103 after being collected by a hydrogen gas transmission gas pipeline; and the oxygen gas outlet of each electrolytic cell 102 is connected to the oxygen gas access port of the post-treatment unit 103 after being collected by the oxygen gas transmission pipeline.

Taking the structure shown in fig. 4 as an example, hydrogen gas, liquid, and oxygen gas, liquid, and gas output from 4 electrolytic cells are collected by corresponding gas pipelines, and then enter a gas-liquid separation device in a post-treatment unit to perform gas-liquid separation and subsequent processes.

Taking two electrolytic tanks connected in series as an example, in the structure shown in fig. 4, the whole system shares one set of post-treatment device; however, in practical engineering application, two series-connected electrolytic tanks can be independently connected with one set of post-treatment device, and the whole system can comprise a plurality of sets of post-treatment devices; that is, each electrolytic cell 102 may be equipped with its own corresponding post-treatment device, as shown in fig. 5 (which is illustrated on the basis of fig. 2), in which case:

the post-processing unit 103 includes: at least one post-processing device 301; the gas outlets of the electrolytic cells 102 connected with the same hydrogen production power supply 101 are respectively merged into the same corresponding post-treatment device 301 for gas-liquid separation and subsequent processes.

Of course, in practical applications, each electrolytic cell 102 may be equipped with a corresponding post-treatment device, depending on the specific application environment, and all such devices are within the scope of the present application.

On the basis of the above embodiment, the input end of each hydrogen production power supply 101 in the hydrogen production system can be connected with new energy power or a power grid.

For example, when the energy input end of the hydrogen production power supply 101 is connected to the wind power generation module or the power grid, the hydrogen production power supply 101 is specifically an AC/DC converter, and the topology structure thereof is not limited, and various implementation forms in the prior art can be referred to.

When the energy input end of the hydrogen production power supply 101 is connected with the photovoltaic power generation module, the hydrogen production power supply 101 is specifically a DC/DC converter, the topological structure of which is not limited, and the prior art is also referred to.

That is, the hydrogen production system provided by the application can be applied to the environment of producing hydrogen by using renewable energy sources, and is also applicable to the traditional stable power grid hydrogen production.

The same and similar parts among the various embodiments in this specification can be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, the system or system embodiments, which are substantially similar to the method embodiments, are described in a relatively simple manner, and reference may be made to some descriptions of the method embodiments for relevant points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement without inventive effort.

Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the above description of the disclosed embodiments, the features described in the embodiments may be interchanged or combined with each other to enable those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A hydrogen production system, comprising: at least one hydrogen production power supply, at least two electrolytic tanks and a post-treatment unit; wherein the content of the first and second substances,

at least two electrolytic tanks are connected in series between the anode and the cathode of the output end of the hydrogen production power supply;

and the gas outlets of the electrolytic cells are respectively connected into the post-treatment unit.

2. The hydrogen production system as claimed in claim 1, wherein the rated output voltage of the hydrogen production power supply is less than or equal to the sum of the rated input voltages of the electrolytic cells connected with the output end of the hydrogen production power supply;

the rated output current of the hydrogen production power supply is less than or equal to the minimum value of the rated input currents of the electrolytic cells connected with the output end of the hydrogen production power supply.

3. The hydrogen production system of claim 1, wherein the number of hydrogen production power sources is greater than 1, and the rated output parameters of each hydrogen production power source are the same.

4. The hydrogen generation system of claim 3, wherein the number of electrolysis cells to which each hydrogen generation power source is connected is 2.

5. The system for producing hydrogen of claim 1, wherein rated input parameters of each of the electrolysis cells connected to the same hydrogen production power supply are the same.

6. The hydrogen production system according to any one of claims 1 to 5, wherein the hydrogen production power supply is an AC/DC converter, and the input end of the AC/DC converter is connected with a wind power generation module or a power grid;

the hydrogen production power supply is a DC/DC converter, and the input end of the hydrogen production power supply is connected with the photovoltaic power generation module.

7. The hydrogen production system according to any one of claims 1 to 5, wherein the hydrogen gas outlets of the electrolysis cells are collected by a hydrogen gas transmission gas pipeline and then are connected to a hydrogen gas access port of the post-treatment unit;

and the oxygen gas outlets of the electrolytic cells are collected through an oxygen gas transmission pipeline and then are connected into the oxygen access port of the post-treatment unit.

8. The hydrogen generation system according to any one of claims 1 to 5, wherein the post-treatment unit comprises: at least one post-processing device;

the gas outlets of the electrolysis baths connected with the same hydrogen production power supply are respectively merged into the same corresponding post-treatment device.

9. The hydrogen generation system of any of claims 1 to 5, wherein the electrolysis cell is: an alkaline water electrolyzer, or a proton exchange membrane electrolyzer.

10. The hydrogen production system according to any one of claims 1 to 5, wherein the outlet means of the electrolytic cell is end plate outlet.

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