CN115418655A - Water electrolysis hydrogen production system and hydrogen production method - Google Patents
Water electrolysis hydrogen production system and hydrogen production method Download PDFInfo
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- CN115418655A CN115418655A CN202211061214.0A CN202211061214A CN115418655A CN 115418655 A CN115418655 A CN 115418655A CN 202211061214 A CN202211061214 A CN 202211061214A CN 115418655 A CN115418655 A CN 115418655A
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- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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Abstract
The application discloses a hydrogen production system and a hydrogen production method by water electrolysis, which comprise the following steps: the system comprises an isolation transformer, a power electronic converter, a main control unit, a first electrolytic tank, a second electrolytic tank, an electrolyte circulating pump, a frequency converter, a hydrogen-liquid separation device, a hydrogen purification device, an electrolyte tank, a heat exchanger, a water charging system, a cooling system, an oxygen-liquid separation device, a first flow sensor, a second flow sensor, a first temperature acquisition module and a second temperature acquisition module. The application also discloses a hydrogen production method by electrolyzing water, which can realize the control of active power and reactive power and simultaneously provides a control method for the rapid temperature rise of the electrolytic cell. The method is favorable for reducing the manufacturing cost of the power electronic converter, reducing the cost of cables and the loss of the cables, and can realize the quick temperature rise starting of the electrolytic cell through control.
Description
Technical Field
The application belongs to the field of hydrogen production by water electrolysis in the field of hydrogen energy, and particularly relates to a system and a method for producing hydrogen by water electrolysis.
Background
In the existing water electrolysis hydrogen production technology, an electrolytic cell is formed by overlapping a plurality of small electrolytic cells, the larger the number of the small cells is, the higher the rated voltage is, but the electrolytic cell is limited by the whole weight and the manufacturing process, the number of the small cells of the electrolytic cell cannot be too large, and the area of a polar plate of the small cell needs to be increased to realize higher power level, so that higher current is needed to drive the electrolytic cell. The low voltage and large current lead to low efficiency of the hydrogen production power supply and high cost of the cable or copper bar.
The voltage of the small cell of the electrolytic cell is higher than that of the small cell of the electrolytic cell in a hot state, the current of the cold start process of the conventional electrolytic cell needs to be gradually increased in order to prevent overvoltage, the electrolyte can normally work after being heated to the optimal temperature, the start time is too long, and the requirement of quick start of a large-scale hydrogen production system cannot be met.
Disclosure of Invention
The application provides a water electrolysis hydrogen production system and a hydrogen production method, which can reduce the use amount of cables, improve the system efficiency and realize the quick start of the water electrolysis hydrogen production system.
In order to achieve the above purpose, the present application provides the following solutions:
a system for producing hydrogen by electrolyzing water, comprising: the system comprises an isolation transformer, a power electronic converter, a main control unit, a first electrolytic tank, a second electrolytic tank, an electrolyte circulating pump, a frequency converter, a hydrogen-liquid separation device, a hydrogen purification device, an electrolyte tank, a heat exchanger, a water charging system, a cooling system, an oxygen-liquid separation device, a first flow sensor, a second flow sensor, a first temperature acquisition module and a second temperature acquisition module;
the isolation transformer is connected with the power electronic converter and is used for voltage reduction and isolation;
the main control unit is used for receiving a hydrogen production quantity or hydrogen production power instruction and issuing a control instruction to the power electronic converter;
the first electrolytic tank and the second electrolytic tank are electrically connected in series, the anode of the first electrolytic tank is connected with the output anode of the power electronic converter, the cathode of the first electrolytic tank is connected with the anode of the second electrolytic tank, the connection point is grounded, and the cathode of the second electrolytic tank is connected with the output cathode of the power electronic converter; the liquid inlet of the first electrolytic tank, the hydrogen mixed liquid outlet and the oxygen mixed liquid outlet are all arranged at the negative electrode of the first electrolytic tank, and the liquid inlet of the second electrolytic tank, the hydrogen mixed liquid outlet and the oxygen mixed liquid outlet are all arranged at the positive electrode of the second electrolytic tank;
the first electrolytic tank and the second electrolytic tank are in a parallel connection structure on an electrolyte circulation loop, an electrolyte supply pipeline is divided into two branches, one branch supplies electrolyte to the first electrolytic tank, the other branch supplies electrolyte to the second electrolytic tank, a hydrogen mixed liquid outlet of the first electrolytic tank and a hydrogen mixed liquid outlet of the second electrolytic tank are converged together and connected with the hydrogen-liquid separation device, and an oxygen mixed liquid outlet of the first electrolytic tank and an oxygen mixed liquid outlet of the second electrolytic tank are converged together and connected with the oxygen-liquid separation device;
the frequency converter is connected with the electrolyte circulating pump and used for receiving a rotating speed instruction of the main control unit and controlling a motor of the electrolyte circulating pump to reach a given rotating speed value, and the frequency converter is used for adjusting the flow of electrolyte;
the electrolyte tank is connected with the heat exchanger, and the heat exchanger is used for realizing heat dissipation of the electrolyte; the heat exchanger is also connected with the water replenishing system, and the electrolyte tank is also connected with the cooling system;
the hydrogen purification device is connected with the hydrogen-liquid separation device;
the first flow sensor is arranged at an electrolyte water inlet of the first electrolytic tank and used for measuring the flow of the electrolyte of the first electrolytic tank, and the second flow sensor is arranged at an electrolyte water inlet of the second electrolytic tank and used for measuring the flow of the electrolyte of the second electrolytic tank;
the first temperature acquisition module is arranged at the hydrogen mixed liquid outlet of the first electrolytic tank and is used for measuring the temperature of the electrolyte outlet of the first electrolytic tank;
the second temperature acquisition module is installed the mixed liquid outlet of second electrolysis trough hydrogen, the second temperature acquisition module is used for measuring second electrolysis trough electrolyte outlet temperature.
Preferably, the input of the power electronic converter is three-phase alternating current, the output of the power electronic converter is direct current, the power electronic converter has 2 modes of output current closed-loop control and output constant-voltage current-limiting control, and the power electronic converter further has a reactive power regulation function of an input side.
Preferably, the main control unit comprises a first communication module, a second communication module, a third communication module and a signal acquisition module; the first communication module is communicated with the upper-layer energy management system and receives a hydrogen production amount or hydrogen production power instruction; the second communication module is communicated with the power electronic converter and gives the output current and the voltage amplitude limit value of the power electronic converter through communication; the third communication module is communicated with the frequency converter; the signal acquisition module acquires signals of first electrolytic tank voltage, second electrolytic tank voltage, output current of the power electronic converter, first electrolytic tank electrolyte flow, second electrolytic tank electrolyte flow, pressure and temperature.
Preferably, the power electronic converter includes: the system comprises an input side three-phase LC filter, a plurality of power electronic switches, a control board, a sampling board and a direct current filter capacitor bank.
Preferably, the control board is provided with a communication unit, communicates with the main control unit, receives a control command, and executes current closed-loop control and voltage closed-loop control.
Preferably, the sampling plate is used for collecting input voltage, input current, output voltage and output current.
Preferably, the first temperature acquisition module comprises a temperature sensor, an electrical isolation circuit, a communication circuit and a power supply circuit.
Preferably, the second temperature acquisition module comprises a temperature sensor, an electrical isolation circuit, a communication circuit and a power supply circuit.
A method for producing hydrogen by electrolyzing water, which is used for hydrogen production operation by using the system for producing hydrogen by electrolyzing water as claimed in any one of claims 1 to 8, and comprises the following steps:
acquiring an upper-layer energy management platform instruction, a first electrolytic tank voltage, a second electrolytic tank voltage, an output current of a power electronic converter, a first electrolytic tank electrolyte flow, a second electrolytic tank electrolyte flow, a first electrolytic tank temperature and a second electrolytic tank temperature;
judging whether the electrolyte in the electrolytic cell reaches the optimal temperature or not, and if not, executing rapid temperature rise control;
according to the active power or hydrogen production instruction, setting a set value of the output current of the power electronic converter, and simultaneously controlling the frequency converter to adjust the flow of the electrolyte so that the flow is matched with the current of the electrolytic cell;
and sending a corresponding reactive power value to the power electronic converter according to the reactive power instruction, and controlling and outputting corresponding reactive power by the power electronic converter.
Preferably, the rapid temperature rise control includes:
and (3) temperature judgment: the temperature of the first electrolytic tank is lower than the optimal working temperature and the temperature of the second electrolytic tank is lower than the optimal working temperature, and the rapid temperature control is carried out;
constant-voltage current-limiting control: the power electronic converter performs constant-voltage current-limiting control, at the moment, the output voltage is taken as a closed loop, the output voltage is controlled to be the rated voltage of the electrolytic cell, the current is not controlled when the current does not reach the rated current, and when the current reaches the rated current, the current is limited by controlling not to exceed the rated current;
electrolyte flow restriction control: giving a rotating speed instruction of a frequency converter, reducing the rotating speed of the electrolyte circulating pump, and controlling the flow to be k times of the normal flow, wherein k is less than 1,k, the value is changed, k is increased along with the increase of the temperature, and k =1 when the temperature reaches the optimal operating temperature point.
The beneficial effect of this application does:
1) Compared with the conventional water electrolysis hydrogen production scheme, the electrolysis baths are connected in series, the current is reduced by half under the same power, and the use amount of cables or copper bars is reduced by half;
2) The electrolyte circulation loops are connected in parallel, 2 electrolytic tanks share one set of electrolyte circulation system, hydrogen liquid separation device, oxygen liquid separation device, hydrogen purification device and other devices, and the initial investment is reduced;
3) The flow of the electrolyte is reduced by controlling in the starting process, and meanwhile, the power electronic converter adopts constant-voltage current-limiting control to realize the quick starting of the electrolytic cell from a cold state;
4) The voltage and the current of the first electrolytic cell and the second electrolytic cell are monitored in real time, and early warning can be carried out in advance when the electrolytic cells are aged or broken down.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings without any inventive exercise.
FIG. 1 is a schematic diagram of a system for producing hydrogen by electrolyzing water according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of a method for producing hydrogen by electrolyzing water according to the second embodiment of the present application;
fig. 3 is a schematic diagram of another hydrogen production by water electrolysis according to the third embodiment of the present application.
Description of the reference numerals
1. An isolation transformer; 2. a power electronic converter; 3. a main control unit; 4. a first electrolytic bath; 5. a second electrolytic tank; 6. an electrolyte circulating pump; 7. a frequency converter; 8. a hydrogen-liquid separation device; 9. a hydrogen purification device; 10. a hydrogen buffer tank; 11. an electrolyte tank; 12. a heat exchanger; 13. a water replenishing system; 14. a cooling system; 15. an oxygen-liquid separation device; 16. a current sensor; 17. a first voltage sensor; 18. a second voltage sensor; 19. a first flow sensor; 20. a second flow sensor; 21. a first temperature acquisition module; 22. and the second temperature acquisition module.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 1, for the purpose of providing a schematic diagram of an electrolyzed water system according to the present application, an electrolyzed water system comprises: the system comprises an isolation transformer 1, a power electronic converter 2, a main control unit 3, a first electrolytic tank 4, a second electrolytic tank 5, an electrolyte circulating pump 6, a frequency converter 7, a hydrogen-liquid separation device 8, a hydrogen purification device 9, a hydrogen buffer tank 10, an electrolyte tank 11, a heat exchanger 12, a water supplementing system 13, a cooling system 14, an oxygen-liquid separation device 15, a current sensor 16, a first voltage sensor 17, a second voltage sensor 18, a first flow sensor 19, a second flow sensor 20, a first temperature acquisition module 21 and a second temperature acquisition module 22.
The isolation transformer 1 reduces the input 35kV or 10kV to 500V-900V, and has the functions of reducing voltage and isolating, and in order to avoid circulating current, the low-voltage side of the isolation transformer 1 is not grounded.
The power electronic converter 2 has 2 modes of output current closed-loop control and output constant voltage current-limiting control, and also has a reactive power regulation function of an input side.
The first electrolytic tank 4 and the second electrolytic tank 5 are electrically connected in series, the voltage grade of the system is improved, the rated voltage after series connection can exceed 1000V, the anode of the first electrolytic tank 4 is connected with the output anode of the power electronic converter 2, the cathode of the first electrolytic tank 4 is connected with the anode of the second electrolytic tank 5, the connection point is connected with the ground, and the cathode of the second electrolytic tank 5 is connected with the output cathode of the power electronic converter 2.
The inlet of first electrolysis trough 4, the mixed liquid export of hydrogen, the mixed liquid export of oxygen all set up at the negative pole, and the inlet of second electrolysis trough 5, the mixed liquid export of hydrogen, the mixed liquid export of oxygen all set up at the positive pole, and at the during operation, the positive pole of 4 negative poles of first electrolysis trough and second electrolysis trough 5 all with earth equipotential, has avoided electrolyte circulation system to have the electric potential to take place the electric shock danger to ground.
The first electrolytic tank 4 and the second electrolytic tank 5 are in a parallel structure on an electrolyte circulation loop, an electrolyte supply pipeline is divided into two branches, one branch supplies electrolyte to the first electrolytic tank 4, the other branch supplies electrolyte to the second electrolytic tank 5, each branch is provided with a flow sensor for measuring the flow of the electrolyte, a hydrogen mixed liquid outlet of the first electrolytic tank 4 and a hydrogen mixed liquid outlet of the second electrolytic tank 5 are converged together and connected with the hydrogen-liquid separation device 8, and an oxygen mixed liquid outlet of the first electrolytic tank 4 and an oxygen mixed liquid outlet of the second electrolytic tank 5 are converged together and connected with the oxygen-liquid separation device 15.
The current sensor 16 is connected in series with an output cable or copper bar of the power electronic converter 2 and is used for measuring output current;
the first voltage sensor 17 is connected with the first electrolytic tank 4 in parallel and is used for measuring the voltage of the first electrolytic tank 4; the second voltage sensor 18 is connected in parallel with the second electrolytic tank 5 for measuring the voltage of the second electrolytic tank 5.
The first flow sensor 19 is arranged at the electrolyte water inlet of the first electrolytic tank 4 and used for measuring the flow of the electrolyte of the first electrolytic tank 4, and the second flow sensor 20 is arranged at the electrolyte water inlet of the second electrolytic tank 5 and used for measuring the flow of the electrolyte of the second electrolytic tank 5.
The main control unit 3 comprises a first communication module, a second communication module, a third communication module and a signal acquisition module; the first communication module is communicated with the upper-layer energy management system and receives a hydrogen production amount or hydrogen production power instruction; the second communication module is communicated with the power electronic converter 2 and gives the output current and the voltage amplitude limit value of the power electronic converter through communication; the third communication module is communicated with the frequency converter 7; the signal acquisition module acquires signals of the voltage of the first electrolytic tank 4, the voltage of the second electrolytic tank 5, the output current of the power electronic converter 2, the electrolyte flow of the first electrolytic tank 4 and the electrolyte flow, pressure and temperature of the second electrolytic tank 5.
The power electronic converter 2 comprises: the system comprises an input side three-phase LC filter, a plurality of power electronic switches, a control board, a sampling board and a direct current filter capacitor bank. The control board is provided with a communication unit which is communicated with the main control unit, receives a control instruction, executes current closed-loop control and can limit the maximum output voltage. The sampling plate is used for collecting input voltage, input current, output voltage and output current; the power electronic converter 2 adopts a three-level topology, and the power electronic switch adopts an IGBT.
The first temperature acquisition module 21 comprises a temperature sensor, an electrical isolation circuit, a communication circuit and a power supply circuit, and the first temperature acquisition module 21 is installed at the hydrogen mixed liquid outlet of the first electrolytic tank and used for measuring the temperature of the electrolyte outlet of the first electrolytic tank 4; the second temperature acquisition module 22 comprises a temperature sensor, an electrical isolation circuit, a communication circuit and a power supply circuit, and is installed at the hydrogen mixed liquid outlet of the second electrolytic tank and used for measuring the electrolyte outlet temperature of the second electrolytic tank 5.
The output of the frequency converter 7 is connected with a motor of the electrolyte circulating pump 6, and the frequency converter 7 receives a rotating speed instruction of the main control unit 3 and controls the motor of the electrolyte circulating pump 6 to reach a given rotating speed value, so as to adjust the flow of the electrolyte.
The gas separated by the hydrogen-liquid separation device 8 enters a hydrogen purification device 9, and the separated liquid flows into an electrolyte tank 11. The liquid separated by the oxygen-liquid separating device 15 flows into the electrolytic tank 11. The electrolyte tank 11 stores the prepared electrolyte and is also provided with a water replenishing port connected with a water replenishing system 13.
The hydrogen purification device 9 is connected with the hydrogen-liquid separation device 8, the hydrogen purification device 9 mainly has the functions of further dehydrating, removing oxygen in the hydrogen, and feeding the purified hydrogen into the hydrogen buffer tank 10.
The heat exchanger 12 primarily functions to dissipate heat from the electrolyte and transfer the heat to the cooling system 14.
Example two
As shown in fig. 2, a method for producing hydrogen by electrolyzing water provided by the present application comprises the following steps:
executing and acquiring an upper energy management platform instruction: starting and stopping instructions, active power or hydrogen production instructions and reactive power instructions; the first electrolytic bath voltage, the second electrolytic bath voltage, the output current of the power electronic converter, the electrolyte flow of the first electrolytic bath, the electrolyte flow of the second electrolytic bath, the temperature of the first electrolytic bath and the temperature of the second electrolytic bath;
judging whether the electrolyte in the electrolytic cell reaches the optimal temperature or not, and if not, executing rapid temperature rise control;
1) And (3) temperature judgment: the temperature of the first electrolytic tank is lower than the optimal working temperature and the temperature of the second electrolytic tank is lower than the optimal working temperature, and the rapid temperature control is carried out;
2) Constant-voltage current-limiting control: the power electronic converter performs constant voltage current limiting control, the output voltage is taken as a closed loop at the moment, the output voltage is controlled to be the rated voltage of the electrolytic cell, and the current is not controlled but the current is limited to be not more than the rated current at the moment;
3) Limiting the flow of the electrolyte: giving a rotating speed instruction of a frequency converter, reducing the rotating speed of the electrolyte circulating pump, and controlling the normal flow of which the flow is k times, wherein k < 1,k is a variable value, k is increased along with the increase of the temperature, and when the temperature reaches the nearest operating temperature point k =1.
According to the active power or hydrogen production instruction, setting a set value of the output current of the power electronic converter, and simultaneously controlling the frequency converter to adjust the flow of the electrolyte so that the flow is matched with the current of the electrolytic cell;
according to the reactive instruction, a corresponding reactive value is issued to the power electronic converter, and the power electronic converter controls and outputs corresponding reactive power;
and fault detection and protection, namely judging whether the system state is normal according to the acquired signals, and executing shutdown protection if the system state is abnormal.
The fault detection and protection comprises: the method comprises the following steps of detecting and protecting voltage unbalance of a first electrolytic tank and a second electrolytic tank, over-voltage protection of the first electrolytic tank, over-voltage protection of the second electrolytic tank, over-current detection and protection, under-current detection and protection, hydrogen leakage detection and protection, temperature unbalance detection and protection and electrolyte flow unbalance detection and protection; the voltage unbalance detection and protection of the first electrolytic tank and the second electrolytic tank means that when the absolute value of the voltage difference between the voltage detected by the first voltage sensor and the voltage detected by the second voltage sensor exceeds a preset protection limit value, protection is triggered, and the shutdown operation is automatically executed; the temperature imbalance detection and protection means that when the absolute value of the difference between the temperature detected by the first temperature acquisition module and the temperature detected by the second temperature acquisition module exceeds a preset protection limit value, protection is triggered, and shutdown operation is automatically executed; the electrolyte flow imbalance detection and protection means that when the absolute value of the difference between the flow detected by the first flow sensor and the flow detected by the second flow sensor exceeds a preset protection limit value, protection is triggered, and the shutdown operation is automatically executed.
EXAMPLE III
As shown in fig. 3, the double split transformer 1 reduces the high voltage (35 kV or 10 kV) to the low voltage, and its output has two sets of windings, which are respectively connected to the first power electronic converter 2 and the second power electronic converter 322, and the first power electronic converter 2 and the second power electronic converter 322 respectively control a set of electrolytic cells connected in series.
In the present embodiment, the electrolyte circulation circuits of first electrolytic bath 4, second electrolytic bath 5, third electrolytic bath 324 and fourth electrolytic bath 325 are connected in parallel, and share one auxiliary system 31, and the auxiliary system 31 includes: the device comprises a frequency converter 7, an electrolyte circulating pump 6, a heat exchanger 12, an electrolyte tank 11, a water replenishing system 13, a hydrogen-liquid separating device 8, a hydrogen purifying device 9, a hydrogen buffer tank 10, an oxygen-liquid separating device 15 and a cooling system 14.
The first power electronic converter 2 and the second power electronic converter 322 share one main control unit 3, and the main control unit 3 receives an instruction of an upper energy management system and respectively issues a control instruction to the two power electronic converters.
In this embodiment the first power electronic converter 2 and the second power electronic converter 322 can be activated individually to control the operation of the connected electrolysis cells.
Although the present application has been described in connection with some embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the present application is limited only by the accompanying claims. Additionally, although individual features may be included in different claims, these may possibly advantageously be combined, and the inclusion in different claims does not imply that a combination of features is not feasible and/or advantageous. The order of features in the claims does not imply any specific order in which the features must be worked. Furthermore, in the claims, the word "comprising" does not exclude other elements, and the terms "a" or "an" do not exclude a plurality. Reference signs in the claims are provided merely as a clarifying example and shall not be construed as limiting the scope of the claims in any way.
The above-described embodiments are merely illustrative of the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the design spirit of the present application should fall within the protection scope defined by the claims of the present application.
Claims (10)
1. A system for producing hydrogen by electrolyzing water, comprising: the system comprises an isolation transformer, a power electronic converter, a main control unit, a first electrolytic tank, a second electrolytic tank, an electrolyte circulating pump, a frequency converter, a hydrogen-liquid separation device, a hydrogen purification device, an electrolyte tank, a heat exchanger, a water replenishing system, a cooling system, an oxygen-liquid separation device, a first flow sensor, a second flow sensor, a first temperature acquisition module and a second temperature acquisition module;
the isolation transformer is connected with the power electronic converter and is used for voltage reduction and isolation;
the main control unit is used for receiving a hydrogen production quantity or hydrogen production power instruction and issuing a control instruction to the power electronic converter;
the first electrolytic tank and the second electrolytic tank are electrically connected in series, the anode of the first electrolytic tank is connected with the output anode of the power electronic converter, the cathode of the first electrolytic tank is connected with the anode of the second electrolytic tank, the connection point is connected with the ground, and the cathode of the second electrolytic tank is connected with the output cathode of the power electronic converter; the liquid inlet, the hydrogen mixed liquid outlet and the oxygen mixed liquid outlet of the first electrolytic tank are all arranged at the negative electrode of the first electrolytic tank, and the liquid inlet, the hydrogen mixed liquid outlet and the oxygen mixed liquid outlet of the second electrolytic tank are all arranged at the positive electrode of the second electrolytic tank;
the first electrolytic tank and the second electrolytic tank are in a parallel connection structure on an electrolyte circulation loop, an electrolyte supply pipeline is divided into two branches, one branch supplies electrolyte to the first electrolytic tank, the other branch supplies electrolyte to the second electrolytic tank, a hydrogen mixed liquid outlet of the first electrolytic tank and a hydrogen mixed liquid outlet of the second electrolytic tank are converged together and connected with the hydrogen-liquid separation device, and an oxygen mixed liquid outlet of the first electrolytic tank and an oxygen mixed liquid outlet of the second electrolytic tank are converged together and connected with the oxygen-liquid separation device;
the frequency converter is connected with the electrolyte circulating pump and used for receiving a rotating speed instruction of the main control unit and controlling a motor of the electrolyte circulating pump to reach a given rotating speed value, and the frequency converter is used for adjusting the flow of electrolyte;
the electrolyte tank is connected with the heat exchanger, and the heat exchanger is used for realizing heat dissipation of the electrolyte; the heat exchanger is also connected with the water replenishing system, and the electrolyte tank is also connected with the cooling system;
the hydrogen purification device is connected with the hydrogen-liquid separation device;
the first flow sensor is arranged at the electrolyte water inlet of the first electrolytic tank and used for measuring the flow of the electrolyte of the first electrolytic tank, and the second flow sensor is arranged at the electrolyte water inlet of the second electrolytic tank and used for measuring the flow of the electrolyte of the second electrolytic tank;
the first temperature acquisition module is arranged at the hydrogen mixed liquid outlet of the first electrolytic tank and is used for measuring the electrolyte outlet temperature of the first electrolytic tank;
the second temperature acquisition module is installed the mixed liquid outlet of second electrolysis trough hydrogen, the second temperature acquisition module is used for measuring second electrolysis trough electrolyte outlet temperature.
2. The system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein the power electronic converter has 2 modes of output current closed-loop control and output constant voltage current-limiting control, and has reactive power regulation function at the input side.
3. The system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein the main control unit comprises a first communication module, a second communication module, a third communication module and a signal acquisition module; the first communication module is communicated with the upper-layer energy management system and receives a hydrogen production amount or hydrogen production power instruction; the second communication module is communicated with the power electronic converter and gives the output current and the voltage amplitude limit value of the power electronic converter through communication; the third communication module is communicated with the frequency converter; the signal acquisition module acquires a first electrolytic tank voltage, a second electrolytic tank voltage, the output current of the power electronic converter, the electrolyte flow of the first electrolytic tank, the electrolyte flow of the second electrolytic tank, pressure and temperature signals.
4. The system for producing hydrogen by electrolyzing water as claimed in claim 2, wherein said power electronic converter comprises: the system comprises an input side three-phase LC filter, a plurality of power electronic switches, a control board, a sampling board and a direct current filter capacitor bank.
5. The system for producing hydrogen through electrolysis of water as claimed in claim 4, wherein the control board is provided with a communication unit which is communicated with the main control unit, receives control commands and executes current closed-loop control and voltage closed-loop control.
6. The system for producing hydrogen through electrolyzing water as claimed in claim 4, wherein the sampling plate is used for collecting input voltage, input current, output voltage and output current.
7. The system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein the first temperature collecting module comprises a temperature sensor, an electrical isolation circuit, a communication circuit and a power supply circuit.
8. The system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein the second temperature collecting module comprises a temperature sensor, an electrical isolation circuit, a communication circuit and a power supply circuit.
9. A method for producing hydrogen by electrolyzing water, which is used for hydrogen production operation by using the system for producing hydrogen by electrolyzing water as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:
acquiring an upper-layer energy management platform instruction, a first electrolytic tank voltage, a second electrolytic tank voltage, an output current of a power electronic converter, a first electrolytic tank electrolyte flow, a second electrolytic tank electrolyte flow, a first electrolytic tank temperature and a second electrolytic tank temperature;
judging whether the electrolyte in the electrolytic cell reaches the optimal temperature or not, and if not, executing rapid temperature rise control;
according to the active power or hydrogen production instruction, setting a set value of the output current of the power electronic converter, and simultaneously controlling the frequency converter to adjust the flow of the electrolyte so that the flow is matched with the current of the electrolytic cell;
and sending a corresponding reactive power value to the power electronic converter according to the reactive power instruction, and controlling and outputting corresponding reactive power by the power electronic converter.
10. A method for producing hydrogen by electrolyzing water according to claim 9, wherein said rapid temperature rise control comprises:
and (3) temperature judgment: the temperature of the first electrolytic tank is lower than the optimal working temperature and the temperature of the second electrolytic tank is lower than the optimal working temperature, and the rapid temperature control is carried out;
constant-voltage current-limiting control: the power electronic converter performs constant-voltage current-limiting control, at the moment, the output voltage is taken as a closed loop, the output voltage is controlled to be the rated voltage of the electrolytic cell, the current is not controlled when the current does not reach the rated current, and when the current reaches the rated current, the current is limited by controlling not to exceed the rated current;
electrolyte flow restriction control: and giving a rotating speed instruction of a frequency converter, reducing the rotating speed of the electrolyte circulating pump, and controlling the normal flow of which the flow is k times, wherein k < 1,k is a variable value, k is increased along with the increase of the temperature, and k =1 when the temperature reaches an optimal operating temperature point.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115572990A (en) * | 2022-12-09 | 2023-01-06 | 长春吉电氢能有限公司 | Hydrogen production system and control method thereof |
| CN116377464A (en) * | 2023-04-21 | 2023-07-04 | 绍兴西爱西尔数控科技有限公司 | Circulating water-cooled safety explosion-proof electrolytic tank set |
| CN117967511A (en) * | 2024-04-01 | 2024-05-03 | 上海勘测设计研究院有限公司 | Hydrogen-production offshore wind power system adapting to randomness and intermittence of fan power generation |
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2022
- 2022-08-31 CN CN202211061214.0A patent/CN115418655A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115572990A (en) * | 2022-12-09 | 2023-01-06 | 长春吉电氢能有限公司 | Hydrogen production system and control method thereof |
| CN115572990B (en) * | 2022-12-09 | 2023-03-10 | 长春吉电氢能有限公司 | Hydrogen production system and control method thereof |
| CN116377464A (en) * | 2023-04-21 | 2023-07-04 | 绍兴西爱西尔数控科技有限公司 | Circulating water-cooled safety explosion-proof electrolytic tank set |
| CN116377464B (en) * | 2023-04-21 | 2023-12-29 | 绍兴西爱西尔数控科技有限公司 | Circulating water-cooled safety explosion-proof electrolytic tank set |
| CN117967511A (en) * | 2024-04-01 | 2024-05-03 | 上海勘测设计研究院有限公司 | Hydrogen-production offshore wind power system adapting to randomness and intermittence of fan power generation |
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