CN113249738B - Novel water electrolysis hydrogen production system and operation method thereof - Google Patents
Novel water electrolysis hydrogen production system and operation method thereof Download PDFInfo
- Publication number
- CN113249738B CN113249738B CN202110595062.1A CN202110595062A CN113249738B CN 113249738 B CN113249738 B CN 113249738B CN 202110595062 A CN202110595062 A CN 202110595062A CN 113249738 B CN113249738 B CN 113249738B
- Authority
- CN
- China
- Prior art keywords
- electrolytic cell
- energy storage
- power
- storage module
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The invention provides a novel water electrolysis hydrogen production system and an operation method thereof, wherein the system comprises: the energy storage module is arranged, when the running state of the electrolytic cell is overload or sudden change of input power, the conversion module converts the voltage of an external power supply into the power supply voltage of the electrolytic cell and the charging voltage of the energy storage module, and the energy storage module is charged, so that the rapid energy storage advantage of the energy storage element is utilized, continuous overload and large-amplitude power climbing of the electrolytic cell are avoided, the conditions of instantaneous large-air-quantity fluctuation and continuous high potential are reduced, the durability of the electrolytic cell is improved, and the recovery of the trough state is promoted by utilizing a load reduction stage; and/or when the running state of the electrolytic cell is low load, the energy storage module discharges, and the conversion module converts the external power supply voltage and the discharge voltage of the energy storage module into the power supply voltage of the electrolytic cell, so that the problems that the hydrogen content in oxygen is increased, the energy consumption of a system is greatly increased and the like caused by the fact that the electrolytic cell runs at too low current density are avoided, the safe and stable running capability of electrolytic hydrogen production is guaranteed, and the utilization rate of the hydrogen production device is increased.
Description
Technical Field
The invention relates to the technical field of chemical engineering and control, in particular to a novel water electrolysis hydrogen production system and an operation method thereof.
Background
Hydrogen is a clean and efficient secondary energy source, cannot be directly obtained from the nature, and must be obtained through preparation. In the current hydrogen production route, carbon emission does not exist in the process of hydrogen production by water electrolysis, the process is simple, the method is an important hydrogen production way in the future, particularly, hydrogen production by using renewable energy power is realized, the method is a hydrogen production mode capable of realizing zero carbon emission in the whole period, the prepared hydrogen is stored, large-scale consumption of the renewable energy power can be realized, and the problem of unbalanced power supply and demand is solved. However, the prior art of hydrogen production by water electrolysis has problems in cooperation with renewable energy sources. Renewable energy power has randomness and volatility characteristics, power fluctuation of different types, different amplitudes and different frequencies can be brought, the electrolytic cell can operate under the working conditions of frequent start-stop, low load/overload, sudden power increase and the like, and if the working conditions are not controlled, the service life and the durability of the electrolytic cell can be influenced. For example, under the low-load working condition, the operating current density of the electrolytic cell is too low, the hydrogen production amount is limited, the hydrogen content in oxygen is high, potential hazards are brought to the safe operation of the cell, and meanwhile, under the low current density, the energy consumption of an auxiliary machine of the electrolytic hydrogen production device is large, and the energy consumption of a system is relatively high. Under the overload condition, the electrolytic cell operates at high current density, and the voltage is too high, so that the problems of catalyst falling, polar plate corrosion and the like can be caused, and the performance is attenuated. Under the conditions of sudden power increase and the like, rapid and large-scale power climbing generates a large amount of bubbles in a short time, so that reaction is hindered, pressure fluctuation is caused, and the series of problems of instability, even falling-off and the like of the catalyst are brought.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of poor fluctuation adaptability of the hydrogen production device in the prior art, thereby providing a novel water electrolysis hydrogen production system and an operation method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a novel system for producing hydrogen by electrolyzing water, including: the energy storage module, the conversion module and at least one electrolytic cell, wherein the first end of the conversion module is connected with an external power supply, and the second end of the conversion module is connected with the electrolytic cell; the energy storage module is connected with the third end of the conversion module, or the energy storage module is directly connected with the electrolytic cell; the energy storage module is arranged in the conversion module, or the conversion module and the energy storage module are two independent devices; the conversion module is used for realizing voltage conversion between the external power supply and the electrolytic bath and between the external power supply and the energy storage module respectively and/or between the energy storage module and the electrolytic bath; the energy storage module is used for absorbing redundant electric energy of an external power supply and/or providing additional electric energy for the electrolytic cell.
In one embodiment, when the energy storage module is connected with the third end of the conversion module, wherein when the operation state of the electrolytic cell is overload or sudden change of input power, the conversion module converts the voltage of the external power supply into the supply voltage of the electrolytic cell and the charging voltage of the energy storage module, and the energy storage module is charged; and/or when the running state of the electrolytic cell is low load, the energy storage module discharges, and the conversion module converts the voltage of the external power supply and the discharge voltage of the energy storage module into the power supply voltage of the electrolytic cell.
In one embodiment, when the energy storage module is directly connected with the electrolytic cell, wherein when the operation state of the electrolytic cell is overload or sudden change of input power, the conversion module converts the voltage of the external power supply into the supply voltage of the electrolytic cell and the charging voltage of the energy storage module, and the energy storage module is charged; and/or when the running state of the electrolytic cell is low load, the conversion module converts the voltage of the external power supply into the power supply voltage of the electrolytic cell, and the energy storage module discharges to provide additional electric energy for the electrolytic cell.
In one embodiment, when the energy storage module is disposed inside the conversion module and the energy storage module is connected to the third terminal of the conversion module, the conversion module includes: the energy storage device comprises a first DC-DC conversion link and a first AC-DC conversion link, wherein the input end of the first AC-DC conversion link is connected with an external power supply, the output end of the first AC-DC conversion link is connected with the input end of the first DC-DC conversion link and the energy storage module, and the output end of the first DC-DC conversion link is connected with the electrolytic cell.
In one embodiment, when the energy storage module and the conversion module are two independent devices, and the energy storage module is connected to the third terminal of the conversion module, the conversion module further includes: the energy storage device comprises a second DC-DC conversion link, a third DC-DC conversion link and a second AC-DC conversion link, wherein the input end of the second AC-DC conversion link is respectively connected with an external power supply, the output end of the second AC-DC conversion link is connected with the input end of the second DC-DC conversion link and the first end of the third DC-DC conversion link, the output end of the second DC-DC conversion link is connected with an electrolytic bath, and the second end of the third DC-DC conversion link is connected with an energy storage module.
In one embodiment, the novel system for producing hydrogen by electrolyzing water further comprises: the water circulation module is used for providing water for electrolysis for the electrolytic bath; the cooling module is connected with the second end of the water circulation module, and cooling water in the cooling module is subjected to heat replacement with the electrolytic bath and is subjected to heat replacement with the cooling module.
In one embodiment, the novel system for producing hydrogen by electrolyzing water further comprises: the oxygen module is connected with the second end of the electrolytic cell and is used for purifying and compressing oxygen output by electrolytic water of the electrolytic cell and then storing the oxygen; the hydrogen module is connected with the second end of the electrolytic cell and is used for purifying and compressing hydrogen output by electrolytic water of the electrolytic cell and then storing the hydrogen.
In a second aspect, an embodiment of the present invention provides an operation method of a novel hydrogen production system by water electrolysis, which is characterized in that, based on the hydrogen production system in the first aspect, the operation method includes: acquiring the output power and the output power change rate of an external power supply, and judging the running state of the electrolytic cell based on the output power and the output power change rate; based on the operation state of the electrolytic cell, the maximum hydrogen production amount is taken as an optimization target, the preset constraint condition is combined, and the external power supply is enabled to simultaneously supply power to the electrolytic cell and the energy storage module or the external power supply and the energy storage module are enabled to simultaneously supply power to the electrolytic cell by adjusting the operation power of the electrolytic cell and the operation power of the energy storage module.
In one embodiment, the operating conditions of the cell include: input power abrupt change, overload, underload.
In one embodiment, the process of determining the operating condition of the electrolytic cell as an abrupt change in input power comprises: and judging whether the output power change rate exceeds a preset change rate threshold value or not, and when the output power change rate is higher than the preset change rate threshold value, judging that the operation state of the electrolytic cell is input power mutation.
In one embodiment, the process of determining the operating condition of the electrolytic cell as being overloaded comprises: according to a staged power criterion, carrying out staged judgment on the output power: judging whether the output power is higher than a first preset power threshold and lower than a second preset power threshold, starting timing when the output power is higher than the first preset power threshold and lower than the second preset power threshold, and judging that the running state of the electrolytic cell is overload after the electrolytic cell runs for a preset time in an overload mode; or when the input power of the electrolytic cell is higher than a second preset power threshold value, judging that the running state of the electrolytic cell is overload; the first preset power threshold is smaller than the second preset power threshold.
In one embodiment, the process of determining the operating condition of the electrolytic cell as low load comprises: judging whether the output power is lower than a third preset power threshold value or not; and when the input power of the electrolytic cell is lower than a third preset power threshold value, judging that the running state of the electrolytic cell is low load, wherein the third preset power threshold value is smaller than the first preset power threshold value.
In one embodiment, when the operation state of the electrolytic cell is overload or sudden change of input power, the external power supply simultaneously supplies power to the electrolytic cell and the energy storage module; and/or when the running state of the electrolytic cell is low load, the external power supply and the energy storage module simultaneously supply power to the electrolytic cell.
In one embodiment, the preset constraints include: the operation power of the electrolytic cell is greater than or equal to a third preset power threshold, and the operation power of the electrolytic cell is less than or equal to a second preset power threshold; the operation power of the electrolytic cell is greater than a first preset power threshold value, and the duration time of the operation power of the electrolytic cell which is less than a second preset power threshold value is less than a preset time; the sum of the power of the energy storage module and the power of the electrolytic cell is less than or equal to the output power of the external power supply; the operation power of the electrolytic cell is greater than or equal to the minimum operation power, and the operation power of the electrolytic cell is less than or equal to the maximum operation power; the capacity of the energy storage module is greater than or equal to the minimum preset capacity threshold, and the capacity of the energy storage module is less than or equal to the maximum preset capacity threshold.
In one embodiment, the method for operating the novel water electrolysis hydrogen production system further comprises: when the hydrogen production system is started, the energy storage module discharges to preheat the electrolytic cell.
The technical scheme of the invention has the following advantages:
1. according to the novel water electrolysis hydrogen production system and the operation method thereof provided by the invention, the energy storage module is arranged, when the operation state of the electrolytic cell is overload or sudden change of input power, the voltage of the external power supply is converted into the power supply voltage of the electrolytic cell and the charging voltage of the energy storage module by the conversion module, and the energy storage module is charged, so that the rapid energy storage advantage of the energy storage element is utilized, the continuous overload and large-amplitude power climbing of the electrolytic cell are avoided, the conditions of instantaneous large air quantity fluctuation and continuous high potential are reduced, the durability of the electrolytic cell is improved, and the recovery of the trough state of the electrolytic cell is promoted by utilizing a load reduction stage; and/or when the running state of the electrolytic cell is low load, the energy storage module discharges, and the conversion module converts the voltage of the external power supply and the discharge voltage of the energy storage module into the power supply voltage of the electrolytic cell, so that the problems that the hydrogen content in oxygen is increased, the energy consumption of a system is greatly increased and the like caused by the fact that the electrolytic cell runs at low current density are solved, the safe and stable running capability of electrolytic hydrogen production is guaranteed, and the utilization rate of the hydrogen production device is increased.
2. The novel system for producing hydrogen by electrolyzing water and the operation method thereof provided by the invention are characterized in that the output power is judged in stages according to a staged power criterion, when the output power of an external power supply is higher than a first preset power threshold and lower than a second preset power threshold, timing is started, the operation state of an electrolytic cell is judged to be overload after the electrolytic cell is overloaded and operated for a preset time, or when the input power of the electrolytic cell is higher than the second preset power threshold, the operation state of the electrolytic cell is judged to be overload, so that staged overload limitation on the electrolytic cell is realized.
3. According to the novel water electrolysis hydrogen production system and the operation method thereof provided by the invention, the energy storage module releases electric power in the starting process of the hydrogen production device and is used for preheating the water supply module in the electrolytic bath, so that the starting speed of the hydrogen production device is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1(a) and 1(b) are respectively a composition diagram of a specific example of a hydrogen production system provided by an embodiment of the invention;
fig. 2(a) and fig. 2(b) are respectively composition diagrams of a specific example of a transformation module according to an embodiment of the present invention;
fig. 3(a) and 3(b) are respectively a composition diagram of another specific example of a hydrogen production system provided by an embodiment of the invention;
fig. 4(a) and 4(b) are respectively a composition diagram of another specific example of the hydrogen production system provided by the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a novel water electrolysis hydrogen production system, which is applied to occasions of hydrogen production by electrolysis, and as shown in figure 1, the system comprises: the device comprises an energy storage module 1, a conversion module 2 and at least one electrolytic cell 3.
As shown in fig. 1(a), a first end of the conversion module 2 is connected to an external power supply, a second end of the conversion module 2 is connected to the electrolytic cell 3, and the energy storage module 1 is connected to a third end of the conversion module 2.
As shown in fig. 1(b), the first end of the conversion module 2 is connected to an external power source, the second end of the conversion module 2 is connected to the electrolytic cell 3, and the energy storage module 1 is directly connected to the electrolytic cell 3.
The external power supply of the embodiment of the invention can be stable power input or fluctuating power input, the fluctuating power input can be from a renewable energy generator (wind power or photovoltaic generator), the energy storage module 1 can realize rapid energy storage and release and can respond to power fluctuation brought by renewable energy power, the energy storage module 1 can be a super capacitor or a lithium battery or other energy storage modules 1, and simultaneously, the external power supply also comprises a necessary sensing device and a necessary power control device for controlling the charging/discharging power of the external power supply, and the external power supply is not limited herein.
The electrolytic cell 3 of the embodiment of the present invention may further include a monitoring sensor and a control element for material flow at the inlet and outlet of each electrolytic cell body, and the control element may control the operation state of the electrolytic cell 3, which is not limited herein.
When the energy storage module 1 is connected to the third end of the conversion module 2, optionally, the energy storage module 1 according to the embodiment of the present invention is disposed inside the conversion module 2, or the conversion module 2 and the energy storage module 1 are two independent devices, and the specific arrangement manner is as follows:
(1) when the energy storage module 1 is placed inside the conversion module 2, as shown in fig. 2(a), the conversion module 2 includes: the energy storage device comprises a first DC-DC conversion link 21 and a first AC-DC conversion link 22, wherein the input end of the first AC-DC conversion link 22 is connected with an external power supply, the output end of the first AC-DC conversion link 22 is connected with the input end of the first DC-DC conversion link 21 and the energy storage module 1, and the output end of the first DC-DC conversion link 21 is connected with the electrolytic cell 3.
(2) When the energy storage module 1 and the conversion module 2 are two independent devices and the external power supply is an ac power supply, as shown in fig. 2(b), the conversion module 2 includes: the energy storage device comprises a second DC-DC conversion link 23, a third DC-DC conversion link 24 and a second AC-DC conversion link 25, wherein the input end of the second AC-DC conversion link 25 is respectively connected with an external power supply, the output end of the second AC-DC conversion link 25 is respectively connected with the input end of the second DC-DC conversion link 23 and the first end of the third DC-DC conversion link 24, the output end of the second DC-DC conversion link 23 is connected with the electrolytic cell 3, and the second end of the third DC-DC conversion link 24 is connected with the energy storage module 1.
It should be noted that the first AC-DC conversion link 22 and the second AC-DC conversion link 25 in the embodiment of the present invention may be single-phase converters or three-phase converters, and the specific structure is determined according to the type of the external power source. In addition, fig. 2(a) and 2(b) are only exemplified by having one electrolytic cell 3, and when the hydrogen production system has at least two electrolytic cells 3, the modified structure of fig. 2(a) and 2(b) can be obtained according to fig. 1(a) and 1(b), and will not be described again.
The conversion module 2 of the embodiment of the invention is used for realizing the voltage conversion between the external power supply and the electrolytic tank 3 and between the external power supply and the energy storage module 1 respectively, and/or between the energy storage module 1 and the electrolytic tank 3; the energy storage module 1 is used for absorbing redundant electric energy of an external power supply and/or providing additional electric energy for the electrolytic cell 3.
The energy storage module 1 of the embodiment of the invention can only charge energy, only discharge energy, or charge energy or discharge energy at the same time, and is specifically divided into the following three conditions:
(1) when the energy storage module 1 only realizes energy charging, only when the energy of the external power supply overshoots, the transformation module 2 converts the voltage of the external power supply into the power supply voltage of the energy storage module 1 and the electrolytic bath 3, and the energy storage module 1 charges energy to consume redundant electric energy of the external power supply.
Specifically, as shown in fig. 1(b), when the energy storage module 1 is directly connected to the electrolytic cell 3, and when the operation state of the electrolytic cell 3 is overload or sudden change of input power, the conversion module 2 converts the voltage of the external power supply into the supply voltage of the electrolytic cell 3 and the charging voltage of the energy storage module 1, the energy storage module 1 is charged to consume the redundant energy of the external power supply, and the conversion module 2 at this time may have an AC-DC link and a DC-DC link.
Specifically, when the energy storage module 1 is connected to the third end of the conversion module 2, wherein when the operation state of the electrolytic cell 3 is overload or sudden change of input power, the conversion module 2 converts the voltage of the external power supply into the supply voltage of the electrolytic cell 3 and the charging voltage of the energy storage module 1, and the energy storage module 1 is charged.
Specifically, when the conversion module 2 is in the circuit structure shown in fig. 2(a), and the operation state of the electrolytic cell 3 is overload or sudden change of input power, the first AC-DC conversion link 22 rectifies the external power into direct current, a part of the direct current supplies power to the electrolytic cell 3 after voltage conversion is performed through the first DC-DC conversion link 21, the other part of the direct current directly charges the energy storage module 1, and the energy storage module 1 consumes the redundant power of the external power.
Specifically, when the conversion module 2 is the circuit structure shown in fig. 2(b), and the operation state of the electrolytic cell 3 is overload or sudden change of input power, the second AC-DC conversion link 25 converts an alternating current power supply into a direct current, a part of the direct current supplies power to the electrolytic cell 3 after voltage conversion is performed by the second DC-DC conversion link 23, and the other part of the direct current charges the energy storage module 1 after voltage conversion is performed by the third DC-DC conversion link 24, and the energy storage module 1 consumes redundant power of an external power supply.
(2) When the energy storage module 1 realizes energy release and the energy storage module 1 is connected with the third end of the conversion module 2, only when the energy of the external power supply is too low and is not enough to maintain the electrolytic cell 3, the energy storage module 1 discharges, and the conversion module 2 converts the discharge voltage of the energy storage module 1 and the voltage of the external power supply into the supply voltage of the electrolytic cell 3.
Specifically, when the conversion module 2 is in the circuit structure shown in fig. 2(a) and the operation state of the electrolytic cell 3 is a low load, the first AC-DC conversion link 22 rectifies the external power supply into a direct current, the energy storage module 1 discharges, and the direct current and the discharge voltage of the energy storage module 1 are subjected to voltage conversion by the first DC-DC conversion link 21 and then supply power to the electrolytic cell 3.
Specifically, when the conversion module 2 has the circuit structure shown in fig. 2(b), the external power supply is an alternating current power supply, and the operation state of the electrolytic cell 3 is a low load, the first AC-DC conversion link 22 rectifies the external power supply into a direct current, the energy storage module 1 discharges electricity through the third DC-DC conversion link 24, and the direct current and the discharge voltage of the energy storage module 1 supply electricity to the electrolytic cell 3 after voltage conversion is performed through the first DC-DC conversion link 21.
(3) When the energy storage module 1 realizes energy release and the energy storage module 1 is directly connected with the electrolytic cell 3, only when the energy of the external power supply is too low and is not enough to maintain the electrolytic cell 3, the energy storage module 1 discharges, the voltage of the external power supply is converted into the power supply voltage of the electrolytic cell 3 by the conversion module 2, and the energy storage module 1 and the external power supply simultaneously supply power to the electrolytic cell 3.
Specifically, as shown in fig. 1(b), when the energy storage module 1 is directly connected to the electrolytic cell 3, and when the operation state of the electrolytic cell 3 is low load, the conversion module 2 still converts the external power voltage into the power supply voltage of the electrolytic cell 3, and in addition, the energy storage module 1 discharges to provide the rest of the electric energy for the electrolytic cell 3.
In one embodiment, the conversion module 2 converts the voltage of the external power supply into the supply voltage of the electrolytic cell 3 when the operation state of the electrolytic cell 3 is not in the conditions of overload, low load and sudden change of input power.
Specifically, as shown in fig. 1(b), when the energy storage module 1 is directly connected to the electrolytic cell 3 and the operation state of the electrolytic cell 3 is not under the conditions of overload, low load and sudden change of input power, the conversion module 2 converts the voltage of the external power supply into the power supply voltage of the electrolytic cell 3, and at this time, only the external power supply supplies power to the electrolytic cell 3.
Specifically, when the conversion module 2 has the circuit structure shown in fig. 2(a), and the operation state of the electrolytic cell 3 is not in the conditions of overload, low load, and sudden change of input power, the first AC-DC conversion link 22 converts the voltage of the external power supply into direct current, the energy storage module 1 does not charge or discharge, and only the direct current is subjected to voltage conversion by the first DC-DC conversion link 21 and then supplies power to the electrolytic cell 3.
Specifically, when the conversion module 2 is in the circuit structure shown in fig. 2(b), the external power supply is a DC power supply, and the operation state of the electrolytic cell 3 is not under the conditions of overload, low load, and sudden change in input power, the voltage of the external power supply is converted into a DC power through the second AC-DC conversion link 25, the energy storage module 1 is neither charged nor discharged, and only the DC power is supplied to the electrolytic cell 3 after being subjected to voltage conversion by the second DC-DC conversion link 23.
In one embodiment, as shown in fig. 3(a) and 3(b), the novel system for producing hydrogen by electrolyzing water further comprises: the water circulation module 4 and the cooling module 5, wherein the first end of the water circulation module 4 is connected with the electrolytic cell 3, and the water circulation module 4 is used for providing water for electrolysis for the electrolytic cell 3; the cooling module 5 is connected with the second end of the water circulation module 4, and the cooling water in the cooling module 5 is thermally replaced with the electrolytic bath 3 and the cooling module 5.
Specifically, the water circulation module 4 can provide water for electrolysis and cooling for the electrolytic bath 3, and can comprise a heat exchanger, a water pump and a water tank, wherein the water pump can be a variable frequency water pump; the gas module may include a gas-liquid separator, a purification device, a gas compression device, a gas storage tank, and the like, and is not limited herein.
Since the electrolytic cell 3 generates electric heat during electrolysis, the water cooling module of the embodiment of the present invention further provides cooling water for the electrolytic cell 3 to perform heat exchange with the electrolytic cell 3, and at the same time, the water cooling module further performs heat exchange with the cooling module 5, and the cooling module 5 further replaces the electrolysis heat to the outside air or the heat using unit, wherein the cooling module 5 may include a water pump and a water tank, which is not limited herein.
In one embodiment, as shown in fig. 4(a) and 4(b), the novel system for producing hydrogen by electrolyzing water further comprises: the oxygen module 6 is connected with the second end of the electrolytic cell 3, and the oxygen module 6 is used for purifying and compressing the oxygen output by the electrolytic water of the electrolytic cell 3 and then storing the oxygen; the hydrogen module 7 is connected with the second end of the electrolytic cell 3, and the hydrogen module 7 is used for purifying and compressing the hydrogen output by the electrolytic cell 3.
Example 2
The embodiment of the invention provides an operation method of a novel water electrolysis hydrogen production system, which is based on the hydrogen production system of the embodiment 1 and comprises the following steps:
step S11: and acquiring the output power and the output power change rate of the external power supply, and judging the running state of the electrolytic cell based on the output power and the output power change rate.
The operation state of the electrolytic cell of the embodiment of the invention comprises the following steps: input power abrupt change, overload, underload.
Specifically, the process of determining the operation state of the electrolytic cell as the sudden change of the input power comprises the following steps: and judging whether the output power change rate of the external power supply exceeds a preset change rate threshold value or not, and judging that the operation state of the electrolytic cell is sudden input power change when the output power change rate of the external power supply is higher than the preset change rate threshold value.
Specifically, the process of determining the operation state of the electrolytic cell as the overload includes:
according to a staged power criterion, carrying out staged judgment on the output power: judging whether the output power is higher than a first preset power threshold and lower than a second preset power threshold, starting timing when the output power is higher than the first preset power threshold and lower than the second preset power threshold, and judging that the running state of the electrolytic cell is overload after the electrolytic cell runs for a preset time in an overload mode; or when the input power of the electrolytic cell is higher than a second preset power threshold value, judging the running state of the electrolytic cell to be overload.
Specifically, when judging whether the running state of the electrolytic cell is overload, the embodiment of the invention adopts an improved staged power criterion and combines the overload power of the electrolytic cell and the overload power duration as the overload criterion. Setting a first preset power threshold, a second preset power threshold and preset time, wherein the first preset power threshold is smaller than the second preset power threshold, when the output power of the external power supply exceeds the first preset power threshold and is smaller than the second preset power threshold, the electrolytic cell is in overload operation at the moment, timing is started, and when the electrolytic cell is in overload operation for the preset time, if the output power of the external power supply still exceeds the first preset power threshold and is smaller than the second preset power threshold, the operation state of the electrolytic cell is judged to be overload; or judging whether the input power exceeds a second preset power threshold, and judging the running state of the electrolytic cell as overload when the duration time that the input power of the electrolytic cell exceeds the first preset power threshold exceeds a preset time threshold or the input power exceeds the second preset power threshold.
Specifically, the process of determining the operation state of the electrolytic cell as the low load according to the embodiment of the invention comprises the following steps: judging whether the output power is lower than a third preset power threshold value or not; and when the input power of the electrolytic cell is lower than a third preset power threshold value, judging that the running state of the electrolytic cell is low load, wherein the third preset power threshold value is smaller than the first preset power threshold value.
Step S12: based on the operation state of the electrolytic cell, the maximum hydrogen production amount is taken as an optimization target, the preset constraint condition is combined, and the external power supply is enabled to simultaneously supply power to the electrolytic cell and the energy storage module or the external power supply and the energy storage module are enabled to simultaneously supply power to the electrolytic cell by adjusting the operation power of the electrolytic cell and the operation power of the energy storage module.
Specifically, after the electrolytic cell is started, only an external power supply supplies power to the electrolytic cell, and in the process of supplying power to the electrolytic cell by the external power supply, the embodiment of the invention monitors the running state of the electrolytic cell, divides the running state of the electrolytic cell into three conditions of overload, low load and sudden change of input power based on the output power and the change rate of the output power of the external power supply, starts an energy storage module to absorb redundant power when the running state of the electrolytic cell is overload or sudden change of the input power, reduces the load of the electrolytic cell, limits the overload power of the electrolytic cell and the duration of the overload power, and improves the durability of the electrolytic cell; and/or when the running state of the electrolytic cell is low load, starting the energy storage module to discharge, improving the input power of the electrolytic cell, and avoiding the problems of hydrogen content increase in oxygen, great increase of system energy consumption and the like caused by the fact that the electrolytic cell runs at too low current density.
Specifically, when the operation state of the electrolytic cell is any one of overload, low load and sudden change of input power, in the process of adjusting the power of the energy storage module and the electrolytic cell, the capacity of the energy storage module cannot be infinite but is limited to a certain extent, so that the wind and light fluctuation power prediction method is added to predict the future output power, and the power distribution of the energy storage module and the electrolytic cell is performed by taking the maximum hydrogen production amount shown in the formula (1) as an optimization target and combining the preset constraint condition shown in the formula (2).
In the formula (1), N is the number of the electrolytic cells, f is the maximum hydrogen production amount, Pe t Ee is the hydrogen production energy consumption per unit of hydrogen production by electrolysis (the power consumption per unit of hydrogen production is marked by kWh/Nm) 3 ) And the characteristics of different hydrogen production and electrolysis devices are different along with the change of hydrogen production power.
In the formula (2), PL is a third predetermined power threshold, PHH is a second predetermined power threshold, P s For the current moment of the energy storage module power, P t For the output power of an external power supply, T t For the overload operation time of the electrolyzer, T is a preset time, P min For minimum operating power of the cell, P max For maximum operating power, SOC, of the cell min For minimum preset capacity threshold, SOC, of energy storage module max For minimum preset capacity threshold, SOC, of energy storage module t The capacity of the energy storage module at the current moment.
Specifically, PL. ltoreq.Pe t PHH is less than or equal to the running power of the electrolytic cell and is greater than or equal to a third preset power threshold, and the running power of the electrolytic cell is less than or equal to a second preset power threshold; t is t T is more than or equal to T, the running power of the electrolytic cell is larger than a first preset power threshold value, the duration time of the running power of the electrolytic cell smaller than a second preset power threshold value is smaller than the preset time, and the overload running time of the electrolytic cell is smaller than the preset time; p e +P s ≤P t Indicating that the sum of the power of the energy storage module and the power of the electrolytic cell at the current moment is less than or equal toThe output power of an external power supply; p min ≤SOC t ≤P max The operation power of the electrolytic cell at the current moment is larger than or equal to the minimum operation power, and the operation power of the electrolytic cell is smaller than or equal to the maximum operation power; SOC min ≤SOC t ≤SOC max The capacity of the energy storage module is larger than or equal to the minimum preset capacity threshold, and the capacity of the energy storage module is smaller than or equal to the maximum preset capacity threshold.
In formula (2), when the external power supply simultaneously supplies power to the energy storage module and the electrolytic cell, P is e 、P s 、P t Both are positive values, when the external power supply and the energy storage module simultaneously supply power to the electrolytic cell, P is e 、P t Are all positive values, P s Is negative.
In the embodiment of the invention, when the operation state of the electrolytic cell is not overload, low load and power sudden change, the conversion module converts the voltage of the external power supply into the power supply voltage of the electrolytic cell, namely when the output power of the external power supply is normal, only the external power supply supplies power to the electrolytic cell.
In a specific embodiment, the operation method of the novel water electrolysis hydrogen production system further comprises the following steps:
when the hydrogen production system is started, the energy storage module discharges to preheat the electrolytic cell, so that the starting speed of the whole hydrogen production device is increased.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (11)
1. A novel system for producing hydrogen by electrolyzing water is characterized by comprising: an energy storage module, a conversion module and at least one electrolytic cell, wherein,
the first end of the conversion module is connected with an external power supply, and the second end of the conversion module is connected with the electrolytic cell; the energy storage module is connected with the third end of the conversion module, or the energy storage module is directly connected with the electrolytic cell; the energy storage module is arranged in the conversion module, or the conversion module and the energy storage module are two independent devices;
the conversion module is used for realizing voltage conversion between an external power supply and the electrolytic bath and between the external power supply and the energy storage module respectively and/or between the energy storage module and the electrolytic bath;
the energy storage module is used for consuming redundant electric energy of the external power supply and/or providing additional electric energy for the electrolytic cell;
when the energy storage module is arranged in the conversion module and the energy storage module is connected with the third end of the conversion module, the conversion module comprises: the energy storage device comprises a first DC-DC conversion link and a first AC-DC conversion link, wherein the input end of the first AC-DC conversion link is connected with the external power supply, the output end of the first AC-DC conversion link is connected with the input end of the first DC-DC conversion link and the energy storage module, and the output end of the first DC-DC conversion link is connected with an electrolytic bath;
when the energy storage module and the conversion module are two independent devices and the energy storage module is connected with the third end of the conversion module, the conversion module further comprises: the energy storage device comprises a second DC-DC conversion link, a third DC-DC conversion link and a second AC-DC conversion link, wherein the input end of the second AC-DC conversion link is respectively connected with the external power supply, the output end of the second AC-DC conversion link is connected with the input end of the second DC-DC conversion link and the first end of the third DC-DC conversion link, the output end of the second DC-DC conversion link is connected with the electrolytic bath, and the second end of the third DC-DC conversion link is connected with the energy storage module;
when the energy storage module is directly connected with an electrolytic cell, wherein when the running state of the electrolytic cell is overload or sudden change of input power, the conversion module converts the voltage of the external power supply into the power supply voltage of the electrolytic cell and the charging voltage of the energy storage module, and the energy storage module is charged; and/or when the running state of the electrolytic cell is low load, the conversion module converts the voltage of the external power supply into the power supply voltage of the electrolytic cell, and the energy storage module discharges to provide additional electric energy for the electrolytic cell.
2. The novel system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein when the energy storage module is connected to the third end of the conversion module,
when the running state of the electrolytic cell is overload or sudden change of input power, the conversion module converts the voltage of the external power supply into the power supply voltage of the electrolytic cell and the charging voltage of the energy storage module, and the energy storage module is charged;
and/or when the running state of the electrolytic cell is low load, the energy storage module discharges, and the conversion module converts the voltage of the external power supply and the discharge voltage of the energy storage module into the power supply voltage of the electrolytic cell.
3. The novel system for producing hydrogen by electrolyzing water as claimed in claim 1, further comprising: a water circulation module and a cooling module, wherein,
the first end of the water circulation module is connected with the electrolytic tank, and the water circulation module is used for providing water for electrolysis for the electrolytic tank;
the cooling module is connected with the second end of the water circulation module, and cooling water in the cooling module is subjected to heat replacement with the electrolytic cell and is subjected to heat replacement with the cooling module.
4. The novel system for producing hydrogen by electrolyzing water as claimed in claim 1, further comprising: an oxygen module and a hydrogen module, wherein,
the oxygen module is connected with the second end of the electrolytic cell and is used for purifying, compressing and storing oxygen output by the electrolytic cell electrolyzed water;
the hydrogen module is connected with the second end of the electrolytic cell and is used for purifying and compressing hydrogen output by electrolytic water of the electrolytic cell and then storing the hydrogen.
5. A novel operation method of a water electrolysis hydrogen production system is characterized in that the operation method is based on the hydrogen production system of any one of claims 1 to 4 and comprises the following steps:
acquiring the output power and the output power change rate of an external power supply, and judging the running state of the electrolytic cell based on the output power and the output power change rate;
based on the operation state of the electrolytic cell, taking the maximum hydrogen production amount as an optimization target, combining preset constraint conditions, and adjusting the operation power of the electrolytic cell and the operation power of the energy storage module to enable the external power supply to simultaneously supply power to the electrolytic cell and the energy storage module, or enable the external power supply and the energy storage module to simultaneously supply power to the electrolytic cell;
the maximum hydrogen production amount calculation formula is as follows:
wherein N is the number of the electrolytic cells, f is the maximum hydrogen production amount, Pe t Ee is the power of the electrolytic cell at the current moment, and Ee is the hydrogen production energy consumption of the unit of electrolytic hydrogen production;
the preset constraint conditions comprise: the operation power of the electrolytic cell is greater than or equal to a third preset power threshold, and the operation power of the electrolytic cell is less than or equal to a second preset power threshold; the operation power of the electrolytic cell is greater than a first preset power threshold value, and the duration time of the operation power of the electrolytic cell which is less than a second preset power threshold value is less than a preset time; the sum of the power of the energy storage module and the power of the electrolytic cell is less than or equal to the output power of the external power supply; the operation power of the electrolytic cell is greater than or equal to the minimum operation power, and the operation power of the electrolytic cell is less than or equal to the maximum operation power; the capacity of the energy storage module is greater than or equal to a minimum preset capacity threshold value, and the capacity of the energy storage module is less than or equal to a maximum preset capacity threshold value;
the first preset power threshold is smaller than the second preset power threshold, and the third preset power threshold is smaller than the first preset power threshold.
6. The operation method of the novel water electrolysis hydrogen production system according to claim 5, wherein the operation state of the electrolytic cell comprises: input power abrupt change, overload, underload.
7. The operation method of the novel water electrolysis hydrogen production system according to claim 6, wherein the step of judging the operation state of the electrolytic cell as the sudden change of the input power comprises the following steps:
and judging whether the output power change rate exceeds a preset change rate threshold value or not, and judging that the operation state of the electrolytic cell is input power sudden change when the output power change rate is higher than the preset change rate threshold value.
8. The operation method of the novel water electrolysis hydrogen production system according to claim 6, wherein the process of judging the operation state of the electrolytic cell as overload comprises the following steps:
according to a staged power criterion, performing staged judgment on the output power:
judging whether the output power is higher than a first preset power threshold and lower than a second preset power threshold, starting timing when the output power is higher than the first preset power threshold and lower than the second preset power threshold, and judging that the running state of the electrolytic cell is overload after the electrolytic cell runs for a preset time in an overload mode; or when the input power of the electrolytic cell is higher than a second preset power threshold value, judging that the running state of the electrolytic cell is overload.
9. The operation method of the novel water electrolysis hydrogen production system according to claim 8, wherein the process of judging the operation state of the electrolytic cell as low load comprises the following steps:
judging whether the output power is lower than a third preset power threshold value or not;
and when the input power of the electrolytic cell is lower than a third preset power threshold value, judging that the running state of the electrolytic cell is low load.
10. The operation method of the novel water electrolysis hydrogen production system according to claim 6,
when the running state of the electrolytic cell is overload or sudden change of input power, the external power supply simultaneously supplies power to the electrolytic cell and the energy storage module;
and/or when the running state of the electrolytic cell is low load, the external power supply and the energy storage module simultaneously supply power to the electrolytic cell.
11. The method of operating a novel system for producing hydrogen by electrolyzing water as claimed in claim 6, further comprising:
when the hydrogen production system is started, the energy storage module discharges to preheat the electrolytic cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110595062.1A CN113249738B (en) | 2021-05-28 | 2021-05-28 | Novel water electrolysis hydrogen production system and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110595062.1A CN113249738B (en) | 2021-05-28 | 2021-05-28 | Novel water electrolysis hydrogen production system and operation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113249738A CN113249738A (en) | 2021-08-13 |
| CN113249738B true CN113249738B (en) | 2022-08-05 |
Family
ID=77185269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110595062.1A Active CN113249738B (en) | 2021-05-28 | 2021-05-28 | Novel water electrolysis hydrogen production system and operation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113249738B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675889A (en) * | 2021-08-31 | 2021-11-19 | 河北建投新能源有限公司 | Multi-terminal direct-current microgrid hydrogen production control method based on energy storage regulation |
| CN113690938A (en) * | 2021-08-31 | 2021-11-23 | 河北建投新能源有限公司 | Hydrogen production system control method based on power model prediction |
| CN113839403B (en) * | 2021-10-13 | 2024-04-16 | 河北建投新能源有限公司 | Energy storage hydrogen production control method and device, storage medium and electronic equipment |
| CN114086203A (en) * | 2021-11-19 | 2022-02-25 | 中国华能集团清洁能源技术研究院有限公司 | Intermittent and fluctuating electrolysis hydrogen production control method |
| CN114752944A (en) * | 2021-12-29 | 2022-07-15 | 苏氢氢能科技(浙江)有限公司 | Novel hydrogen production system by electrolyzing water |
| CN114790558A (en) * | 2022-04-29 | 2022-07-26 | 阳光氢能科技有限公司 | New energy hydrogen production system and switching control method thereof |
| WO2023207201A1 (en) * | 2022-04-29 | 2023-11-02 | 阳光氢能科技有限公司 | New energy hydrogen production system and control method therefor |
| CN114752950A (en) * | 2022-05-16 | 2022-07-15 | 中国标准化研究院 | Wave type power input hydrogen production method and device by electrolyzing water |
| CN114934281A (en) * | 2022-05-31 | 2022-08-23 | 同济大学 | Hybrid hydrogen production system coupled with electrochemical power supply and control method thereof |
| CN115094433A (en) * | 2022-05-31 | 2022-09-23 | 同济大学 | Hybrid hydrogen production system for coupling electrochemical power supply and super capacitor and control method |
| CN115016416A (en) * | 2022-06-21 | 2022-09-06 | 烟台东德实业有限公司 | Clean energy-based zero-carbon factory control system and method |
| CN115882497A (en) * | 2022-11-01 | 2023-03-31 | 双良节能系统股份有限公司 | Green electricity hydrogen production system, method and device and medium thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103994B (en) * | 2020-08-25 | 2022-04-01 | 同济大学 | Layered coordination control method and device for wind-hydrogen coupling system based on MPC |
| CN112481637A (en) * | 2020-11-10 | 2021-03-12 | 安徽伯华氢能源科技有限公司 | Water electrolysis hydrogen production system for fluctuating power supply and control strategy thereof |
| CN112593249A (en) * | 2020-12-18 | 2021-04-02 | 广东电网有限责任公司中山供电局 | New energy hydrogen production platform |
-
2021
- 2021-05-28 CN CN202110595062.1A patent/CN113249738B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113249738A (en) | 2021-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113249738B (en) | Novel water electrolysis hydrogen production system and operation method thereof | |
| CN1845417B (en) | Hybrid energy-storage device for elevator and its controlling method | |
| CN112481637A (en) | Water electrolysis hydrogen production system for fluctuating power supply and control strategy thereof | |
| CN211872097U (en) | Wide-power water electrolysis hydrogen production system | |
| CN1704868A (en) | Electronic apparatus system, fuel cell unit and power supply control method | |
| CN114024327B (en) | Renewable energy source based power generation multifunctional complementary control system and method | |
| CN109572487B (en) | Shutdown control method of fuel cell hybrid power system | |
| CN209313452U (en) | A kind of high efficiency high safety wind power hydrogen production peak-frequency regulation system | |
| KR20190049021A (en) | Renewable energy storage system and operating method thereof | |
| CN114908365B (en) | Off-grid photovoltaic hydrogen production system control method | |
| CN114204606A (en) | Wind-hydrogen-storage system operation mode design method | |
| CN114351164A (en) | Modular water electrolysis hydrogen production system and control method thereof | |
| CN115882515A (en) | Micro-grid system for cooperating multi-type electrolytic hydrogen production and energy storage battery and operation method | |
| CN113832475B (en) | Hydrogen production system by renewable energy sources | |
| CN205489554U (en) | Millet power supply system is filled out in peak clipping based on methanol -water reformation hydrogen manufacturing power generation system | |
| CN102496961A (en) | Direct-current-bus-based wind-solar independent power grid system | |
| CN113452044B (en) | Wind power photovoltaic power grid dispatching method of hydrogen-containing and liquid metal battery hybrid energy storage system | |
| CN113949054A (en) | Power grid autonomous system and method | |
| CN105811443A (en) | Peak shaving and load shifting power supply system and method based on methanol water reforming hydrogen generation power generation system | |
| CN112779549A (en) | Megawatt power station and control method thereof | |
| CN116231167B (en) | Distributed liquid cooling energy storage system | |
| CN113549954B (en) | Electrolytic hydrogen production system device and control method thereof | |
| CN215440698U (en) | Renewable energy electric power water electrolysis hydrogen production system | |
| CN214590632U (en) | Combined energy consumption power generation system | |
| CN215817549U (en) | Wind-solar combined stable water electrolysis hydrogen production system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |