Device for iron-based circulation assisted water electrolysis hydrogen production

Abstract

The utility model relates to a device for producing hydrogen by electrolyzing water, in particular to a device for producing hydrogen by electrolyzing water through iron-based circulation assistance. The utility model aims to solve the problems of large electrolytic solution resistance, high equipment complexity and pipeline blockage in the existing water electrolysis technology. The utility model discloses a device for iron-based circulation assisted water electrolysis hydrogen production. The device comprises an electrolyte tank, an ion exchanger, a circulating pump, a transformer, a rectifier, an electrolytic bath, a first compressor, a second compressor, a high-pressure storage tank, a gas storage tank, a plurality of dryers, a cathode, an anode and a proton exchange membrane. According to the utility model, the design of the carbon powder dispensing electrode is adopted to replace the suspension state of coal slurry, and meanwhile, the one-step electrolysis design and the efficient circulation auxiliary module are combined, so that the solution resistance and the equipment complexity are obviously reduced, and the problem of pipeline blockage is solved; the iron-based circulating auxiliary water electrolysis hydrogen production device is efficient, low in power consumption, stable and reliable, and is suitable for large-scale industrial popularization.

Description

TECHNICAL FIELD

[0001] The utility model relates to a device for hydrogen production by electrolysis of water. BACKGROUND

[0002] Hydrogen energy, as a clean, efficient and sustainable secondary energy source, plays an important role in global energy transformation. Among them, water electrolysis for hydrogen production has attracted much attention due to its high hydrogen purity and no carbon emissions. However, traditional water electrolysis technology needs to overcome the high overpotential of water decomposition, resulting in high power consumption and difficulty in achieving low-cost and large-scale application. Therefore, in recent years, improved methods based on catalyst or auxiliary reaction have gradually attracted attention, such as iron-based cycle assisted water electrolysis for hydrogen production technology.

[0003] Iron-based cycle assisted water electrolysis technology uses the oxidation-reduction cycle of iron to oxidize Fe 2+ to Fe 3+ on the anode side, and reduce Fe 3+ to Fe 2+ on the cathode side, while hydrogen is produced by water decomposition. This technology can effectively reduce the overpotential of water electrolysis and reduce power consumption. However, there are still many bottlenecks in the practical application of existing technology:

[0004] 1. Limitations of traditional carbon source forms: In order to improve the oxidation reaction rate on the anode side, carbon materials are usually introduced as auxiliary reactants. Currently, coal slurry is commonly used as a carbon source. However, the suspension characteristics of coal slurry particles significantly increase the solution resistance, directly affecting the electrolysis efficiency. At the same time, the dispersion and flowability of coal slurry are insufficient, which can easily lead to pipe blockage and equipment wear, increasing the difficulty of operation and maintenance.

[0005] 2. Equipment complexity and power consumption: Existing iron-based cycle water electrolysis technology mostly uses a two-step design, which separately heats the carbon source system containing coal slurry and the iron-based system (Patent No. CN114134511A). This design not only increases the complexity of the device structure, but also increases the power consumption during system operation, especially for temperature control precision, which further increases the cost of equipment and the difficulty of operation.

[0006] 3. Low utilization efficiency of carbon source: A large amount of inorganic mineral components in coal slurry particles cannot directly participate in electrochemical reactions, resulting in low utilization efficiency of carbon source, and residues gradually depositing, affecting the long-term stability of the system. INVENTION CONTENTS

[0007] The utility model aims to solve the problems of large electrolysis solution resistance, high equipment complexity and pipe blockage in existing water electrolysis technology, and provides a device for iron-based cycle assisted water electrolysis for hydrogen production.

[0008] The utility model discloses in view of prior art's insufficient, develop a kind of more efficient, simple and easy to industrialization's iron-based cyclic auxiliary electrolytic water hydrogen production device, to reduce the power consumption and cost of electrolytic water, simplify equipment structure, avoid the problem of solution resistance increase and pipeline blockage caused by coal slurry, for realizing low power consumption, stable operation's electrolytic water hydrogen production provide technical support.

[0009] The utility model discloses one step method electrolysis design, through iron-based redox cycle assists water decomposition hydrogen production.

[0010] A kind of device for iron-based cyclic auxiliary electrolytic water hydrogen production, including electrolyte tank 2, ion exchanger 3, circulating pump 4, transformer 5, rectifier 6, electrolytic cell 7, first compressor 8, second compressor 9, high-pressure storage tank 11, gas storage tank 12, multiple dryers 13, cathode 15, anode 16 and proton exchange membrane 17;

[0011] The electrolytic cell 7 is provided with the proton exchange membrane 17;Proton exchange membrane 17 divides electrolytic cell 7 into anode area and cathode area;Anode 16 is arranged in anode area, and cathode 15 is arranged in cathode area;Anode 16 is connected with the positive pole of rectifier 6, and cathode 15 is connected with the negative pole of rectifier 6;The rectifier 6 is electrically connected with transformer 5;

[0012] Water supply pipe and tail gas discharge pipe are connected with electrolyte tank 2 respectively;Electrolyte tank 2 is connected with electrolytic cell 7 by ion exchanger 3 and circulating pump 4;Electrolytic cell 7 is connected with gas storage tank 12 by multiple dryers 13;Gas storage tank 12 is connected with high-pressure storage tank 11 by first compressor 8 and second compressor 9.

[0013] In the utility model, anode area is used for carrying out the reaction of iron (II) oxidation to iron (III), and the surface of anode 16 is drop-coated with carbon powder for participating in auxiliary reaction;Cathode area is used for reducing iron (III) to iron (II) and generating hydrogen gas;

[0014] In the utility model, ion exchanger 3 and circulating pump 4 constitute a circulating system, and circulating pump 4 is connected with the anode area and the cathode area of electrolytic cell 7 for promoting electrolyte circulation;Ion exchanger 3 is used for adjusting the ion composition of electrolyte to maintain the efficiency of electrochemical reaction;

[0015] In the utility model, high-pressure storage tank 11 and gas storage tank 12 constitute a gas storage system for collecting and storing high-purity hydrogen gas after treatment;

[0016] The utility model discloses a second condenser 10, third condenser 14, dryer 13, first compressor 8 and second compressor 9 constitute hydrogen treatment system, hydrogen treatment system is used for condensing and drying treatment to hydrogen that electrolytic tank 7 cathode area exports to obtain high purity hydrogen, and first compressor 8 and second compressor 9 are located in gas storage system, are used for pressurizing to the hydrogen after processing to deliver or high pressure storage.

[0017] The utility model discloses a transformer 5 and rectifier 6 constitute power supply system, transformer 5 be used for adjusting input voltage, rectifier 6 be used for converting alternating current into direct current, provide stable power supply for electrolytic tank 7.

[0018] The utility model discloses electrolyte tank 2 constitutes water supply system, is used to provide water source as the part of electrolyte to circulation system.

[0019] The utility model discloses the advantages of:

[0020] The utility model discloses device uses carbon powder to replace traditional coal slurry, significantly optimizes the solution characteristics in electrolytic process, and the high efficiency and stability of device are realized through the following technical schemes:

[0021] 1, electrolytic tank 7 structure design:

[0022] Electrolytic tank 7 is the core component of the device, is used to complete iron-based redox reaction and water decomposition reaction, and Fe 2+ Is oxidized to Fe 3+ In anode side, carbon powder participates in the reaction to generate byproduct, and Fe 3+ Is reduced to Fe 2+ And releases hydrogen gas, unlike traditional coal slurry as carbon source, the device directly drops and coats carbon powder on the electrode surface, which significantly reduces the solution resistance, improves the electrolysis efficiency, and avoids the risk of pipeline blockage caused by suspended particles.

[0023] 2, simplified circulation system:

[0024] The device maintains the circulation of electrolyte and the conversion of iron-based ions through ion exchanger 3 and circulating pump 4, compared with the traditional two-step electrolysis method that requires heating different systems separately, the device adopts one-step design, only needs to heat a single system, not only reduces the complexity of the equipment and power consumption, but also reduces heat loss and improves the overall efficiency of the device.

[0025] 3, auxiliary module optimization:

[0026] After hydrogen production, condensation and drying treatment, hydrogen is collected by gas storage tank 12 and stored in high pressure storage tank 11, the cooperation of the dryer and the condensing device ensures the high purity output of hydrogen, and further reduces the power consumption.

[0027] 4. Selection of working solution:

[0028] The device uses water as an electrolyte, replacing the traditional coal slurry system; the low resistance characteristics of water significantly improve the conductivity of the reaction system, reducing the voltage loss of the electrolysis process; through the efficient synergistic effect of the iron-based redox cycle, the decomposition efficiency of water is further improved.

[0029] In summary, the present utility model discloses a carbon powder drop coating electrode design, which replaces the suspended state of coal slurry, and combines one-step electrolysis design and efficient cycle auxiliary module, significantly reducing solution resistance and equipment complexity, solving the problem of pipeline blockage, and providing an efficient, low-power, stable and reliable iron-based cycle auxiliary electrolytic water hydrogen production device suitable for large-scale industrialization.

[0030] System operation, the device uses iron-based redox cycle assisted electrolytic water hydrogen production technology, and the path and operation process of water from raw material to hydrogen production in the device are as follows:

[0031] 1. Water supply:

[0032] When the system is running, water enters the device from the outside through the water supply pipe; after water supply, the water is introduced into the electrolyte circulation system, and the electrolyte (iron-based solution) and carbon powder together form the working solution, which enters the electrolytic tank 7 for reaction;

[0033] 2. Reaction in the electrolytic tank:

[0034] In the electrolytic tank 7, the reaction on the anode side oxidizes Fe2+ in water to Fe3+, and carbon powder participates in the oxidation reaction to generate by-products; Fe3+ on the cathode side is reduced to Fe2+ and hydrogen gas is generated; in this process, part of the water is decomposed into hydrogen gas and oxidation by-products;

[0035] 3. Circulation of electrolyte:

[0036] The working solution of the electrolytic tank 7 flows into the ion exchanger through the circulating pump, and ion exchange is carried out to balance the electrochemical performance and reaction efficiency of the solution, and then returns to the electrolytic tank 7 to realize continuous circulation; the entire circulation system takes the iron-based redox reaction as the core to maintain the activity and stability of the solution, and at the same time, there is no need to replace the electrolyte, reducing the operating cost;

[0037] 4. Collection and treatment of hydrogen gas:

[0038] The hydrogen gas generated in the electrolysis process is output from the cathode side of the electrolytic tank 7, first cooled by the condenser to remove water vapor; then further remove residual moisture through the dryer to ensure high purity of hydrogen gas; finally, the hydrogen gas is stored in the gas tank 12 or high-pressure tank 11 for subsequent use or transportation;

[0039] 5. Tail gas treatment:

[0040] The tail gas discharge pipe is externally provided with a first condenser 1, and the condensation of the tail gas has the following effects: ① recovering water in the anode reaction to maintain stable electrolyte level; and ② cooling the tail gas to reduce the thermal load of the equipment or the environment.

[0041] 6. Water recycling:

[0042] In the electrolysis reaction and hydrogen condensation process, part of the water is consumed, and the remaining water is recycled into the circulation system through the condensing recovery device; the entire device takes water as the core medium to maintain efficient use and good circulation of water resources in the system.

[0043] Through the above steps, the device realizes the complete path of water from supply to participation in electrolysis and then recycling; at the same time, the decomposition of water is assisted by the iron-based redox reaction, which not only improves the electrolysis efficiency but also reduces the power consumption, ensuring long-term stable operation of the device. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A structural schematic diagram of the device for iron-based cyclic auxiliary electrolysis water hydrogen production. DETAILED DESCRIPTION

[0045] Embodiment I: The device for iron-based cyclic auxiliary electrolysis water hydrogen production includes an electrolyte tank 2, an ion exchanger 3, a circulating pump 4, a transformer 5, a rectifier 6, an electrolytic cell 7, a first compressor 8, a second compressor 9, a high-pressure storage tank 11, a gas storage tank 12, a plurality of dryers 13, a cathode 15, an anode 16, and a proton exchange membrane 17.

[0046] The electrolytic cell 7 is internally provided with the proton exchange membrane 17; the proton exchange membrane 17 separates the electrolytic cell 7 into an anode area and a cathode area; the anode 16 is arranged in the anode area, and the cathode 15 is arranged in the cathode area; the anode 16 is connected with the positive electrode of the rectifier 6, and the cathode 15 is connected with the negative electrode of the rectifier 6; and the rectifier 6 is electrically connected with the transformer 5.

[0047] The water supply pipe and the tail gas discharge pipe are respectively connected with the electrolyte tank 2; the electrolyte tank 2 is connected with the electrolytic cell 7 through the ion exchanger 3 and the circulating pump 4; the electrolytic cell 7 is connected with the gas storage tank 12 through the plurality of dryers 13; and the gas storage tank 12 is connected with the high-pressure storage tank 11 through the first compressor 8 and the second compressor 9.

[0048] Embodiment II: The difference between this embodiment and embodiment I is that the surface of the anode 16 is drop-coated with carbon powder, thereby replacing the traditional coal slurry as the carbon source. The other steps are the same as those of embodiment I.

[0049] Specific implementation three: the difference between this embodiment and one or two of the specific implementation is that the tail gas discharge pipe is provided with a first condenser 1. The other steps are the same as those of specific implementation one or two.

[0050] Specific implementation four: the difference between this embodiment and one to three of the specific implementation is that the electrolytic tank 7 and the dryer 13 are communicated with a third condenser 14 outside the pipeline, which is used to cool hydrogen and recover water. The other steps are the same as those of specific implementation one to three.

[0051] Specific implementation five: the difference between this embodiment and one to four of the specific implementation is that the second condenser 10 is provided outside the pipeline connecting the gas storage tank 12 and the high-pressure storage tank 11, which is used to cool hydrogen and recover water. The other steps are the same as those of specific implementation one to four.

[0052] Specific implementation six: the difference between this embodiment and one to five of the specific implementation is that the electrolytic tank 7 is filled with electrolyte, and the electrolyte contains Fe 2+ ions. The other steps are the same as those of specific implementation one to five.

[0053] Specific implementation seven: the difference between this embodiment and one to six of the specific implementation is that the number of dryers 13 is two, and the two dryers are connected in series; the dryer 13 is used to further remove residual moisture to improve the purity of hydrogen. The other steps are the same as those of specific implementation one to six.

[0054] Specific implementation eight: the difference between this embodiment and one to seven of the specific implementation is that the high-pressure storage tank 11 and the gas storage tank 12 are both provided with pressure regulating valves. The other steps are the same as those of specific implementation one to seven.

[0055] Specific implementation nine: the difference between this embodiment and one to eight of the specific implementation is that the material of the electrolytic tank 7 is titanium metal or stainless steel with titanium coating, to adapt to the acidic working environment of the iron-based redox cycle system. The other steps are the same as those of specific implementation one to eight.

Claims

1. A device for iron-based cycle-assisted water electrolysis to produce hydrogen, characterized in that The device comprises an electrolyte tank (2), an ion exchanger (3), a circulation pump (4), a transformer (5), a rectifier (6), an electrolytic cell (7), a first compressor (8), a second compressor (9), a high-pressure storage tank (11), a gas storage tank (12), a plurality of dryers (13), a cathode (15), an anode (16) and a proton exchange membrane (17); A proton exchange membrane (17) is provided in the electrolytic cell (7); the proton exchange membrane (17) divides the electrolytic cell (7) into an anode region and a cathode region; the anode (16) is provided in the anode region, and the cathode (15) is provided in the cathode region; the anode (16) is connected to the positive electrode of the rectifier (6), and the cathode (15) is connected to the negative electrode of the rectifier (6); the rectifier (6) is electrically connected to the transformer (5); The water supply pipe and the tail gas discharge pipe are respectively connected to the electrolyte tank (2); the electrolyte tank (2) is connected to the electrolytic cell (7) through the ion exchanger (3) and the circulation pump (4); the electrolytic cell (7) is connected to the gas storage tank (12) through multiple dryers (13); the gas storage tank (12) is connected to the high-pressure storage tank (11) through the first compressor (8) and the second compressor (9).

2. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that The surface of the anode (16) is drop-coated with carbon powder.

3. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that A first condenser (1) is provided outside the tail gas discharge pipe.

4. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that A third condenser (14) is provided outside the pipeline communicating between the electrolytic cell (7) and the dryer (13).

5. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that A second condenser (10) is provided outside the pipeline connecting the gas storage tank (12) and the high-pressure storage tank (11).

6. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that The electrolytic tank (7) is filled with an electrolyte containing Fe 2+ ion.

7. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that The number of the dryers (13) is 2, and the two dryers are arranged in series.

8. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that The high-pressure storage tank (11) and the gas storage tank (12) are both provided with pressure regulating valves.

9. The device for producing hydrogen by iron-based cycle-assisted water electrolysis according to claim 1, characterized in that The material of the electrolytic cell (7) is titanium metal or stainless steel containing a titanium coating.

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