Alkaline water electrolysis hydrogen production system

Abstract

The application discloses a kind of alkaline water electrolysis hydrogen production systems, including electrolytic cell and with sequentially connected hydrogen separator, hydrogen lye circulating pump, hydrogen lye filter, hydrogen lye cooler equipment, which is composed of first circulating pipeline;Electrolytic cell and sequentially connected oxygen separator, oxygen lye circulating pump, oxygen lye filter, oxygen lye cooler equipment, which is composed of second circulating pipeline;Electrolytic cell is the main equipment of system, by left end plate, right end plate, left end baffle, left baffle unit, middle baffle, right baffle unit, right end baffle composition.Electrode unit is adopted by baffle unit Corrugated structure.Several superimposed baffle unit, membrane electrode assembly are composed of several hydrogen electrolysis chamber, oxygen electrolysis chamber.Hydrogen and oxygen are sent out of system by hydrogen condenser, oxygen condenser.Auxiliary device sends electrolyte into system by pipeline.The system is used to reduce the resistivity of electrolyte, avoid the phenomenon of serious uneven flow on full area of electrode.

Description

Technical Field

[0001] This invention relates to hydrogen production systems, and more specifically to an alkaline water electrolysis hydrogen production system. Background Technology

[0002] In hydrogen production via water electrolysis, baffles are required in the electrolyzer. When direct current passes through the electrolyzer, the electrolyte in the electrolysis chamber formed between the baffles is electrolyzed, producing oxygen at the anode and hydrogen at the cathode. Existing baffles are circular. Because the shortest distance between the inlet and outlet of the electrolysis chamber formed by adjacent circular baffles is radial, the radial flow rate of the electrolyte is relatively large, decreasing progressively closer to the circumference, resulting in significant velocity differences. Gas generated at the periphery is not easily carried away and tends to accumulate. This accumulated gas reduces the conductive area of ​​the electrolyte, causing uneven resistance between electrodes, increasing the resistance of the electrolysis chamber, and increasing power consumption. Moreover, the larger the baffle area, the more severe these problems become, hindering the development of larger-scale hydrogen production electrolyzers. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a method with high efficiency and a single-unit hydrogen production capacity exceeding 1000m³. 3 A large-scale electrolyzer with a capacity of [number] h can significantly reduce the production cost per unit of hydrogen and greatly improve production efficiency in an alkaline water electrolysis hydrogen production system.

[0004] An alkaline water electrolysis hydrogen production system of the present invention includes an electrolyzer, which comprises a left end plate and a right end plate arranged in parallel and spaced apart. The left end plate and the right end plate are fixedly connected by multiple tie bolts. Between the left end plate and the right end plate and installed sequentially from left to right are a left end partition, a left partition unit composed of several overlapping partition units, a middle partition, a right partition unit composed of several overlapping partition units, and a right end partition. The middle partition has a frame structure, and the positive transmission end welded to the middle partition is connected to the positive terminal of a power supply. The first negative transmission end welded to the left end partition and the second negative transmission end welded to the right end partition are respectively connected to the negative terminal of the power supply.

[0005] Each partition unit includes a partition frame, within which a partition core is welded; the partition core includes a corrugated plate structure; the partition unit, the middle partition, the left end partition, the right end partition, and the left and right end plates are rectangular;

[0006] A diaphragm electrode assembly is clamped between the left and right diaphragm units in two adjacent diaphragm units. The diaphragm electrode assembly consists of a cathode, a diaphragm, and an anode that are pressed together from left to right. The diaphragm electrode assembly divides the space between the two diaphragm units into two independent chambers. The chamber with the cathode is the hydrogen electrolysis chamber, and the chamber with the anode is the oxygen electrolysis chamber.

[0007] Oxygen-alkali inlets and hydrogen-alkali inlets are respectively opened on the front and rear sides of the lower part of the left and right partitions. Hydrogen-alkali outlets and oxygen-alkali outlets are respectively opened on the front and rear sides of the upper part of the left and right partitions. Hydrogen-alkali and oxygen-alkali guiding channels are respectively opened on the lower parts of the front and rear frames of all partition frames in the middle partition, the left partition unit, and the right partition unit. The lower horizontal frame of all partition frames of the plate unit has hydrogen alkali inlet channels and oxygen alkali inlet channels on the front and back sides respectively. The upper horizontal frame of all partition frames of the middle partition, the left partition unit, and the right partition unit has oxygen alkali outlet channels and hydrogen alkali outlet channels on the front and back sides respectively. The hydrogen alkali channels in the left partition unit and the middle partition are interconnected. The oxygen alkali channels are interconnected. The hydrogen alkali inlet channels and the oxygen alkali inlet channels are interconnected.

[0008] The hydrogen alkali solution guiding channels at the right partition unit and the middle partition are interconnected, the hydrogen alkali solution inlet channels are interconnected, the oxygen alkali solution guiding channels are interconnected, and the oxygen alkali solution inlet channels are interconnected.

[0009] The hydrogen-alkali solution guiding channel, hydrogen-alkali solution inlet channel, oxygen-alkali solution guiding channel, and oxygen-alkali solution inlet channel on the intermediate partition are all openings that communicate with the inner edge of the frame at corresponding positions of the intermediate partition; the hydrogen-alkali solution guiding cover and the oxygen-alkali solution guiding cover are respectively welded to the frame of the intermediate partition, and the hydrogen-alkali solution guiding channel and the hydrogen-alkali solution inlet channel on the intermediate partition are connected to the hydrogen-alkali solution guiding cover; the oxygen-alkali solution guiding channel and the oxygen-alkali solution inlet channel are connected to the oxygen-alkali solution guiding cover;

[0010] The hydrogen alkali solution inlet channel and the hydrogen alkali solution outlet channel on each partition unit are connected to the cathode chamber through a liquid passage opened on the partition frame, and the oxygen alkali solution inlet channel and the oxygen alkali solution outlet channel are connected to the anode chamber through a liquid passage opened on the partition frame.

[0011] One side of the oxygen-alkali inlet and the hydrogen-alkali inlet on the left and right partitions are respectively connected to the oxygen-alkali liquid guiding channel and the hydrogen-alkali liquid guiding channel on the nearest partition unit, and the other side is respectively connected to one end of the oxygen-alkali liquid inlet pipe and the hydrogen-alkali liquid inlet pipe. One side of the oxygen-alkali outlet and the hydrogen-alkali outlet on the left and right partitions are respectively connected to the oxygen-alkali liquid outlet channel and the hydrogen-alkali liquid outlet channel on the nearest partition unit. The other side of each oxygen-alkali liquid outlet and each hydrogen-alkali liquid outlet is respectively connected to one end of the oxygen-alkali liquid outlet pipeline and the hydrogen-alkali liquid outlet pipeline.

[0012] The other ends of the two hydrogen-alkali solution outlet pipelines are connected in sequence to a hydrogen separator, a hydrogen-alkali solution circulation pump, a hydrogen-alkali solution filter, a hydrogen-alkali solution cooler, and two hydrogen-alkali solution inlet pipelines via a first circulation pipeline. The outlet of the hydrogen separator is connected to a hydrogen condenser. The other ends of the two oxygen-alkali solution outlet pipelines are connected in sequence to an oxygen separator, an oxygen-alkali solution circulation pump, an oxygen-alkali solution filter, an oxygen-alkali solution cooler, and two oxygen-alkali solution inlet pipelines via a second circulation pipeline. The outlet of the oxygen separator is connected to an oxygen condenser. The bottom of the hydrogen separator is connected to the bottom of the oxygen separator via a pipeline and is connected to an auxiliary device.

[0013] The advantages of this invention are:

[0014] 1. Because the partition unit is corrugated, the channel formed after it is stacked with the diaphragm electrode assembly has good sealing performance, which can further increase the electrolyte flow rate and the electrolyte circulation rate in the electrolysis chamber is high, generally 15 to 30 times; thereby accelerating the rising speed of electrolyte and bubbles, reducing the gas content of the electrolyte; helping to reduce the concentration gradient of the electrolyte near the electrode to reduce the concentration polarization; and making the temperature of each electrolysis chamber more uniform, thereby reducing the resistivity of the electrolyte.

[0015] 2. By increasing the width of the partition frame, the number of bolts, the thickness of the end plate structure, and the use of high-performance sealing gaskets and supporting brackets in the middle partition, the working pressure of the electrolytic cell can reach 2.5 MPa, higher than the 1.6 MPa of existing large electrolytic cells.

[0016] Increasing the operating pressure of the electrolyzer and system can reduce the gas content in the electrolyte, thereby reducing its resistance. This solution increases the operating pressure to 2.5 MPa.

[0017] 3. By setting the spacing between the partition frames in the range of 10 to 30 mm, the resistance of the electrolyte is reduced.

[0018] 4. It ensures uniform electrolyte distribution across the cross-section of the electrolysis chamber and prevents lateral flow of electrolyte between channels.

[0019] 5. Compared with the existing circular electrolytic cell partition unit, the electrolyte flow path is uniform, avoiding the difference between the radial and circumferential paths of the electrolyte in the circular partition component, and avoiding the phenomenon of severe uneven liquid flow over the entire electrode area.

[0020] 6. The electrolyte channel has a triangular cross-section with peaks and valleys ranging from 45 to 135 degrees, providing the maximum contact area between the electrolyte and the positive and negative electrodes.

[0021] 7. The working voltage of the electrolysis chamber of the electrolytic cell will be lower than that of the existing electrolytic cell structure, saving energy, especially for large-scale equipment;

[0022] 8. The electrolytic cell has a high load flexibility, ranging from 50% to 120%;

[0023] 9. The single electrolyzer has a large hydrogen production capacity, reaching 630–6300 m³. 3 / h, and can even reach 10000m 3 / h, which can save on equipment investment costs;

[0024] 10. A support bracket is installed at the lower part of the partition plate in the middle of the electrolytic cell to overcome the sinking in the middle of the cell. For larger electrolytic cells, several support partition plates can be configured, the number of which is determined by the length of the electrolytic cell. This avoids sinking in the middle of the electrolytic cell, reduces the additional stress on the bolts caused by the sinking of the cell, reduces leakage of the sealing gaskets caused by sinking, and extends the maintenance cycle of the electrolytic cell.

[0025] 11. The electrolyte cooler adopts air cooling, which is suitable for areas with scarce water resources. Water cooling can also be selected.

[0026] 12. The main body of the electrolytic cell is made of carbon steel plated with nickel or nickel; the partition unit of the electrolytic cell is rectangular, which saves raw materials and can save 20% compared with the electrolytic cell with round partition.

[0027] 13. The end plate of the electrolytic cell adopts a plate-rib structure, which saves steel. In addition, since there are no electrolyte inlet and outlet pipelines on the end plate, the end plate does not need to undergo nickel plating; only conventional anti-corrosion treatment is required, saving processing costs such as electroplating.

[0028] 14. This unit has a high uptime. Multiple backup pipelines equipped with valves can be used to disconnect faulty equipment from the system, allowing for non-stop maintenance of the faulty equipment;

[0029] This structure is more suitable for the needs of photovoltaic and wind power generation plants, with a larger capacity per unit. Compared to existing units producing 1000m³ of hydrogen per unit... 3 Electrolytic cell equipment with a capacity of / h has high efficiency per unit, low investment, requires less manpower for management and operation, occupies less land, and saves water resources. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an alkaline water electrolysis hydrogen production system according to the present invention;

[0031] Figure 2-1 for Figure 1 Schematic diagram of the structure of electrolytic cell 1;

[0032] Figure 2-2 for Figure 2-1 A schematic diagram (AA) of the electrolytic cell structure is shown.

[0033] Figure 3 for Figure 2-1Structural diagram of the left and middle partition unit;

[0034] Figure 4 for Figure 3 BB diagram of the middle partition;

[0035] Figure 5 for Figure 4 A schematic cross-sectional view of the structure with two partitions stacked together.

[0036] Figure 6 This is a schematic diagram of the structure of the hydrogen alkali solution guide cover and the oxygen alkali solution guide cover of the intermediate partition.

[0037] Figure 7-1 This is a structural diagram of a single-layer corrugated core plate;

[0038] Figure 7-2 yes Figure 7-1 A schematic diagram of the single-layer corrugated core plate shown;

[0039] Figure 8-1 Diagram of a single-layer straight corrugated plate partition core structure;

[0040] Figure 8-2 yes Figure 8-1 DD structure diagram of a single-layer straight corrugated plate partition core;

[0041] Figure 9-1 This is a diagram of the partition core structure, which combines corrugated plates and flat plates.

[0042] Figure 9-2 yes Figure 9-1 EE structure diagram of the partition core composed of corrugated plate and flat plate. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0044] As shown in the attached figure, an alkaline water electrolysis hydrogen production system of the present invention includes an electrolyzer 1, wherein the electrolyzer includes a left end plate 2-1 and a right end plate 2-2 arranged parallel to each other. Figure 2-1 As shown, between the left end plate 2-1 and the right end plate 2-2, and sequentially from left to right, are a left end partition 2-4, a left partition unit 2-6 composed of several overlapping partition units, a middle partition 2-8, a right partition unit 2-7 composed of several overlapping partition units, and a right end partition 2-5. The left end plate 2-1 and the right end plate 2-2 are fixedly connected by multiple tie bolts 2-3 to secure the left end partition 2-4, the left partition unit, the middle partition 2-8, the right partition unit, and the right end partition 2-5 between the left end plate 2-1 and the right end plate 2-2. The middle partition 2-8 has a frame structure.

[0045] Preferably, a support bracket 2-9 is provided at the bottom of the middle partition 2-8. More preferably, several support partitions 2-14 are provided at the left partition unit 2-6 and the right partition unit, respectively. The thickness of the middle partition 2-8 is typically 60-150 mm.

[0046] like Figure 2-1 As shown, the intermediate partition 2-8 is disposed between the left and right partitions, dividing the stacked partition units into left and right parts. One part is the left partition unit 2-6 stacked between the left partition 2-4 and the intermediate partition 2-8, and the other part is the right partition unit 2-7 stacked between the right partition 2-5 and the intermediate partition 2-8. The left and right partition units are mirror images of each other.

[0047] Preferably, sealing gaskets 4-9 are installed between all partition units and between each partition unit and the right-end partition 2-5, the middle partition 2-8, and the left-end partition 2-4 to prevent electrolyte leakage. The material is modified engineering plastic.

[0048] Due to the increasing size of electrolytic cells, their bodies are very long. For example, a 1000 m³ / h electrolytic cell is approximately 6 meters long and weighs over 60 tons. To prevent the middle of the electrolytic cell from sinking, a support bracket 2-9 is added to the bottom of the intermediate partition 2-8. For even larger electrolytic cells, a support partition 2-14 is installed, solving the problem of sagging in the middle after some operation. The support partitions, support brackets, and foundation are electrically isolated using insulating boards.

[0049] The preferred partition unit, middle partition, left end partition 2-4, right end partition 2-5, left end plate 2-1 and right end plate 2-2 are rectangular to save materials; of course, square, trapezoidal and other shapes can also be used.

[0050] like Figure 3 , 4 As shown, each partition unit includes a partition frame 3-1, within which a partition core 3-2 is welded. The partition core comprises a single-sided corrugated plate structure, such as... Figure 7-1 , 7-2 As shown in 8-1, 8-2; or as shown in Figure 9-1 , 9-2As shown, the partition core 3-2 includes a flat plate 9-3, on which a left corrugated plate structure 9-1 and a right corrugated plate structure 9-2 are respectively fixed. The left corrugated plate structure 9-1 and the right corrugated plate structure 9-2 are preferably fixed to the flat plate 9-3 by welding. The corrugated plate structure can be formed by die stamping or roll forming. The partition frame 3-1 can be made of nickel-plated carbon steel and formed by mechanical methods. The partition frame 3-1 is preferably 1.5-6m long, 1-4.5m wide, and 10-30mm thick. The partition core 3-2 is 1.4-5.5m long and 0.9-4m wide.

[0051] Preferably, the thickness of the sheet metal in the single-sided corrugated plate structure, the flat plate 9-3, the left corrugated plate structure 9-1, and the right corrugated plate structure 9-2 is 0.3 to 2 mm.

[0052] As in the present invention Figure 7-1 , 7-2 The first embodiment shown and as follows Figure 8-1 , 8-2 In the second embodiment shown, when a single-sided corrugated plate structure is used, the distance W1 between adjacent wave crests of the single-sided corrugated plate structure in the first embodiment and the distance W2 between adjacent wave crests of the single-sided corrugated plate structure in the second embodiment are both 8-30 mm; the peak-valley height difference H1 of the single-sided corrugated plate structure in the first embodiment and the peak-valley height difference H2 of the single-sided corrugated plate structure in the second embodiment are both 8-30 mm; wherein the wave crests of the single-sided corrugated plate structure are continuously folded when projected onto the vertical plane. The parameters of the single-sided corrugated plate structure are set as follows: the tilt angle α1 formed by the crest and the vertical axis of the plate is 0 < α1 ≤ 45°; the interior angle α2 of the crest or trough formed along the vertical axis of the plate is > 90°; and the interior angle α3 of the crest or trough formed along the thickness direction of the plate is between 45° and 135°. Preferably, in the cross-sectional direction of the separator core, the corrugations of the single-sided corrugated plate structures on the two stacked separator cores are tilted in opposite directions, so that the crests of the two single-sided corrugated plate structures are opposite to each other and intersect to form a three-dimensional mesh structure. This allows the diaphragm electrode assembly between the two separator cores to be firmly clamped and positioned stably by the intersections of the three-dimensional mesh structure. When the crest of the single-sided corrugated plate structure is a continuous straight line shape projected onto the vertical plane, the interior angle α4 of the crest or trough formed along the thickness direction of the plate is between 45° and 135°.

[0053] As a third embodiment of the present invention, such as Figure 9-1 , 9-2As shown, when a left corrugated plate structure 9-1 and a right corrugated plate structure 9-2 are fixed on the left and right sidewalls of the plate respectively, the angle between the crests of the left corrugated plate structure 9-1 and the right corrugated plate structure 9-2 and the vertical axis of the plate is 0 < α5 ≤ 45°; the interior angle α6 of the crests or valleys formed along the thickness direction of the plate is 45° to 135°; the distance W3 between adjacent crests of the corrugations is 8 to 20 mm; and the peak-valley height difference H3 of the corrugations is 3 to 15 mm.

[0054] The single-sided corrugated plate structure, as well as the flat plate 9-3, the left corrugated plate structure 9-1, and the right corrugated plate structure 9-2, can be made of nickel-plated carbon steel or nickel plate. When nickel-plated carbon steel is used, the plating thickness is 40-120 μm, and the nickel metal layer is used to prevent corrosion. The left corrugated plate structure 9-1 and the right corrugated plate structure 9-2 can also be made of metal mesh pressed into a corrugated structure. The metal mesh is 4-30 mesh, and the wire diameter of the woven metal mesh is 1-0.2 mm.

[0055] In the three embodiments described above, a smaller inclination angle of the zigzag ripples is more conducive to the uniform distribution of the electrolyte and reduces the electrolyte flow resistance; a smaller distance between the peaks provides stronger support but increases the electrolyte flow resistance; a larger distance has the opposite effect. A smaller peak-to-valley height difference reduces electrolyte resistance, increases electrolyte flow velocity, lowers gas content, and increases electrolysis efficiency; too small a difference leads to increased gas content; a larger height difference has the opposite effect but results in lower gas content.

[0056] The single-sided corrugated plate structure in the first and second types significantly reduces manufacturing costs compared to the double-sided corrugated plate structure in the third type, saving both materials and processing fees. For example... Figure 8-1 , 8-2 The disadvantage of the second structure shown is that the corrugated plate structures on the two overlapping partition cores are arranged with their crests facing each other to form a support structure. This requires the two corrugated plates to have small processing errors and high positioning accuracy, which increases the manufacturing difficulty.

[0057] like Figure 5 As shown, a diaphragm electrode assembly is clamped between the left and right partition units of two adjacent partition units. The diaphragm electrode assembly consists of a cathode 4-4, a diaphragm 4-5, and an anode 4-6, which are sequentially pressed together. The diaphragm electrode assembly divides the space between the two partition units into two independent chambers. The chamber containing the cathode is the hydrogen electrolysis chamber 4-7, where the electrolyte flows and hydrogen gas is generated at the cathode 4-4. The chamber containing the anode is the oxygen electrolysis chamber 4-8, which generates oxygen gas. The electrolyte in the non-working space 4-1, formed by the left corrugated plate structure 9-1, the right corrugated plate structure, and the flat plate 9-3, merely flows through without product generation because the electrolyte does not contact the electrodes.

[0058] like Figure 2-1 , 2-2 As shown, oxygen-alkali inlets (oxygen-alkali inlet 2-10-1 on the left partition and oxygen-alkali inlet 2-10-2 on the right partition) and hydrogen-alkali inlets (hydrogen-alkali inlet 2-11-1 on the left partition and hydrogen-alkali inlet 2-11-2 on the right partition) are respectively opened on the front and rear sides of the lower part of the left partition 2-4 and the right partition 2-5. Hydrogen-alkali outlets (hydrogen-alkali outlet 2-13-1 on the left partition and hydrogen-alkali outlet 2-13-2 on the right partition) and oxygen-alkali outlets (oxygen-alkali outlet 2-12-1 on the left partition and oxygen-alkali outlet 2-12-2 on the right partition) are respectively opened on the front and rear sides of the upper part of the left partition 2-4 and the right partition 2-5. Figure 3 , 4 As shown, hydrogen alkali solution guiding channels 3-3 and oxygen alkali solution guiding channels 3-5 are respectively opened on the lower parts of the front and rear frames of all partition frames at the middle partition 2-8, left partition unit 2-6, and right partition unit. Hydrogen alkali solution inlet channels 3-4 and oxygen alkali solution inlet channels 3-6 are respectively opened on the front and rear sides of the lower horizontal frame of all partition frames at the middle partition 2-8, left partition unit 2-6, and right partition unit. Oxygen alkali solution outlet channels 3-8 and hydrogen alkali solution outlet channels 3-7 are respectively opened on the front and rear sides of the upper horizontal frame of all partition frames at the middle partition 2-8, left partition unit 2-6, and right partition unit. The hydrogen-alkali solution channels 3-3 on the left partition unit 2-6 and the middle partition 2-8 are interconnected, allowing the alkali solution to directly reach the hydrogen-alkali solution channel 3-3 on the middle partition 2-8; the oxygen-alkali solution channels 3-5 are interconnected, allowing the alkali solution to directly reach the oxygen-alkali solution channel 3-5 on the middle partition 2-8. The hydrogen-alkali solution inlet channels 3-4 and 3-6 are interconnected.

[0059] The hydrogen alkali solution guiding channels 3-3 at the right partition unit 2-7 and the middle partition 2-8 are interconnected, the hydrogen alkali solution inlet channels 3-4 are interconnected, the oxygen alkali solution guiding channels 3-5 are interconnected, and the oxygen alkali solution inlet channels 3-6 are interconnected.

[0060] like Figure 6As shown, the hydrogen-alkali solution guiding channel 3-3, hydrogen-alkali solution inlet channel 3-4, oxygen-alkali solution guiding channel 3-5, and oxygen-alkali solution inlet channel 3-6 on the intermediate partition 2-8 are all openings communicating with the inner edges of their respective frame frames of the intermediate partition 2-8. The hydrogen-alkali solution guiding cover 5-1 and the oxygen-alkali solution guiding cover 5-2 are respectively welded to the frame of the intermediate partition 2-8. The hydrogen-alkali solution guiding channel 3-3 and the hydrogen-alkali solution inlet channel 3-4 on the intermediate partition are connected to the hydrogen-alkali solution guiding cover 5-1, allowing the hydrogen-alkali solution to enter the hydrogen-alkali solution guiding cover 5-1 from the hydrogen-alkali solution guiding channel 3-3 and then flow into the hydrogen-alkali solution inlet channel 3-4; the oxygen-alkali solution guiding channel 3-5 and the oxygen-alkali solution inlet channel 3-6 are connected to the oxygen-alkali solution guiding cover 5-2, allowing the oxygen-alkali solution to enter the oxygen-alkali solution guiding cover 5-2 from the oxygen-alkali solution guiding channel 3-5 and then flow into the oxygen-alkali solution inlet channel 3-6.

[0061] The hydrogen alkali solution inlet channel 3-4 and hydrogen alkali solution outlet channel 3-7 on each partition unit are connected to the cathode chamber through liquid passages opened on the partition frame, and the oxygen alkali solution inlet channel 3-6 and oxygen alkali solution outlet channel 3-8 are connected to the anode chamber through liquid passages opened on the partition frame.

[0062] The oxygen-alkali inlet and hydrogen-alkali inlet on the left-end partition 2-4 and right-end partition 2-5, respectively, are connected on one side to the oxygen-alkali liquid guiding channel 3-5 and hydrogen-alkali liquid guiding channel 3-3 on the nearest partition unit, and on the other side to the oxygen-alkali liquid inlet pipe (e.g., Figure 1 As shown, the first oxygen-alkali inlet pipe 16-1, which is connected to the oxygen-alkali liquid guiding channel 3-5 of the left partition unit, the second oxygen-alkali inlet pipe 16-2, which is connected to the oxygen-alkali liquid guiding channel of the right partition unit, and the hydrogen-alkali liquid inlet pipe (as shown) Figure 1 As shown, one end of the first hydrogen alkali inlet pipe 13-1 and the second hydrogen alkali inlet pipe 13-2 are connected. The oxygen alkali outlets (oxygen alkali outlet 2-12-1 on the left side of the partition plate and oxygen alkali outlet 2-12-2 on the right side of the partition plate) and the hydrogen alkali outlets (hydrogen alkali outlet 2-13-1 on the left side of the partition plate and hydrogen alkali outlet 2-13-2 on the right side of the partition plate) on the left side of the partition plate 2-4 and the right side of the partition plate 2-5 are respectively connected to the oxygen alkali outlet channel 3-8 and the hydrogen alkali outlet channel 3-8 on the nearest partition plate unit. The outlet channels 3-7 are connected, and the other side of each of the oxygen alkali outlets and each hydrogen alkali outlet is respectively connected to one end of the oxygen alkali outlet pipeline (the first oxygen alkali outlet pipeline 14-1 connected to the oxygen alkali outlet of the left partition unit, and the second oxygen alkali outlet pipeline 14-2 connected to the oxygen alkali outlet of the right partition unit) and one end of the hydrogen alkali outlet pipeline (the first hydrogen alkali outlet pipeline 15-1 connected to the hydrogen alkali outlet of the left partition unit, and the second hydrogen alkali outlet pipeline 15-2 connected to the hydrogen alkali outlet of the right partition unit).

[0063] The other ends of the two hydrogen-alkali solution outlet pipelines are connected in sequence to the hydrogen separator 3, the hydrogen-alkali solution circulation pump 5, the hydrogen-alkali solution filter 7, the hydrogen-alkali solution cooler 9, and the two hydrogen-alkali solution inlet pipelines via the first circulation pipeline. The outlet of the hydrogen separator 3 is connected to the hydrogen condenser 11.

[0064] The other ends of the two oxygen-alkali solution outlet pipelines are connected in sequence to the oxygen separator 2, the oxygen-alkali solution circulation pump 4, the oxygen-alkali solution filter 6, the oxygen-alkali solution cooler 8, and the two oxygen-alkali solution inlet pipelines via the second circulation pipeline. The outlet of the oxygen separator 2 is connected to the oxygen condenser 12.

[0065] The bottom of the hydrogen separator 3 is connected to the bottom of the oxygen separator 2 via a pipeline 18, and is also connected to an auxiliary device 17 from which electrolyte is replenished. Preferably, the hydrogen-alkali cooler 9 and the oxygen-alkali cooler 8 use air as a cooling source.

[0066] Preferably, a spare pipeline equipped with a valve is connected between the first and second circulation pipelines located at the inlets of the hydrogen-alkali circulation pump 5 and the oxygen-alkali circulation pump 4, between the first and second circulation pipelines located at the outlets of the hydrogen-alkali circulation pump 5 and the oxygen-alkali circulation pump 4, between the first and second circulation pipelines located at the inlets of the hydrogen-alkali cooler 9 and the oxygen-alkali cooler, and between the first and second circulation pipelines located at the outlets of the hydrogen-alkali cooler 9 and the oxygen-alkali cooler. The valves are normally closed. If any equipment malfunctions, the valve on the spare pipeline can be opened, and the valve on the malfunctioning equipment can be closed, ensuring the system can continue to operate.

[0067] For example, if the oxygen-alkali solution circulation pump 4 malfunctions, the oxygen electrolyte cannot be delivered to the oxygen-alkali solution filter 6. In this case, open the valves on the backup lines 10-1 and 10-2, and close the inlet and outlet valves of the oxygen-alkali solution circulation pump 4. The electrolyte from the oxygen separator 2 will then flow through the backup line 10-1 to merge with the electrolyte from the oxygen separator 2 and enter the hydrogen-alkali solution circulation pump 5. A portion of the electrolyte will then flow through the backup line 10-2 back into the oxygen-alkali solution filter 6. This allows the unit to operate normally, but the load is reduced by half.

[0068] The purpose of backup pipelines is to ensure the continuous operation of the entire unit and to minimize the impact of equipment failure on the entire unit.

[0069] The working process of this device is illustrated below using the flow process of hydrogen-alkali solution as an example:

[0070] The hydrogen-alkali solution enters sequentially through the second hydrogen-alkali solution inlet pipe 13-2 into the second hydrogen-alkali solution inlet 2-11-2, the hydrogen-alkali solution guiding channels on the partition frames of all right partition units, and then connects to the hydrogen-alkali solution inlet channel 3-4 on the middle partition 2-8 via the hydrogen-alkali solution guiding channel 3-3. It then connects to the hydrogen-alkali solution inlet channel 3-4 at the right partition unit 2-7. Simultaneously, each hydrogen-alkali solution inlet channel 3-4 connects to a liquid-passing tank on the same partition frame. The electrolyte enters the hydrogen electrolysis chamber at the right partition unit 2-7 through the liquid-passing tank. One end of the second hydrogen-alkali solution outlet 2-13-2 on the right partition is connected to... Figure 1 The second hydrogen alkali solution outlet pipeline 15-2 is connected, and the other end of the second hydrogen alkali solution outlet 2-13-2 is connected to the second hydrogen alkali solution outlet channel 3-7. The hydrogen alkali solution outlet channel 3-7 on each partition frame is connected to the hydrogen electrolysis chamber through the liquid passage opened on the same partition frame. The hydrogen gas and electrolyte in the hydrogen electrolysis chamber at the right partition unit 2-7 flow out to the hydrogen alkali solution outlet channel 3-7 through the liquid passage.

[0071] like Figure 1 As shown, the electrolyte on the cathode side of the electrolytic cell 1 flows out of the first hydrogen-alkali solution outlet 2-13-1 and the second hydrogen-alkali solution outlet 2-13-2, and enters the hydrogen separator 3 through the first hydrogen-alkali solution outlet pipeline 15-1 and the second hydrogen-alkali solution outlet pipeline 15-2. The electrolyte that has separated hydrogen gas passes sequentially through the hydrogen-alkali solution circulation pump 5, the hydrogen-alkali solution filter 7, the hydrogen-alkali solution cooler 9, and the first hydrogen-alkali solution inlet pipeline 13-1 and the second hydrogen-alkali solution inlet pipeline 13-2 into the cathode side of the electrolytic cell 1. The electrolyte flows into the hydrogen-alkali solution inlet 2-11-1 on the left end partition and the hydrogen-alkali solution inlet 2-11-2 on the right end partition. The hydrogen gas separated by the hydrogen separator 3 is discharged from the system through the hydrogen condenser 11.

[0072] The electrolyte on the anode side flows out of the oxygen-alkali solution outlets 2-12-1 on the left and right sides of the partition plate and enters the oxygen separator 2 through the first oxygen-alkali solution outlet pipeline 14-1 and the second oxygen-alkali solution outlet pipeline 14-2. The electrolyte that has separated oxygen passes sequentially through the oxygen-alkali solution circulation pump 4, the oxygen-alkali solution filter 6, the oxygen-alkali solution cooler 8, and the first oxygen-alkali solution inlet pipeline 16-1 and the second oxygen-alkali solution inlet pipeline 16-2 into the anode side of the electrolytic cell 1. The electrolyte flows into the oxygen-alkali solution inlet 2-10-1 on the left and right sides of the partition plate. The oxygen separated by the oxygen separator 2 is discharged from the system through the outlet of the oxygen condenser 12.

[0073] The working process of this device is as follows:

[0074] Raw material water and auxiliary materials such as potassium hydroxide are prepared into electrolyte by auxiliary device 17 and charged into this system; power supply device 19 sends direct current (or direct current obtained by transformer and rectification of alternating current) to the electrolytic cell via positive electrode power supply bus 21 and connects it to the positive power supply terminal 2-16 welded on the middle partition 2-8; negative electrodes 22 and 20 are divided into two paths and connected to the first negative power supply terminal 2-17-1 welded on the left partition 2-4 and the second negative power supply terminal 2-17-2 welded on the right partition, respectively.

[0075] Under the influence of direct current, the electrolyte undergoes electrolysis at both the positive and negative electrodes, generating hydrogen at the negative electrode and oxygen at the positive electrode. The generated hydrogen, along with the electrolyte, enters the first circulation pipeline via the first hydrogen-alkali solution outlet pipeline 15-1 and the second hydrogen-alkali solution outlet pipeline 15-2. It then passes through a hydrogen separator 3, is pressurized by a hydrogen-alkali solution circulation pump 5, is filtered by a hydrogen-alkali solution filter 7 to remove mechanical impurities, and is cooled by a hydrogen-alkali solution cooler 9. The resulting electrolyte is then fed into the electrolytic cell 1 via the first hydrogen-alkali solution inlet pipeline 13-1 and the second hydrogen-alkali solution inlet pipeline 13-2. Similarly, the generated oxygen, along with the electrolyte, enters the second circulation pipeline via the first oxygen-alkali solution outlet pipeline 14-1 and the second oxygen-alkali solution outlet pipeline 14-2. It then passes through an oxygen separator 2, is pressurized by an oxygen-alkali solution circulation pump 4, is filtered by an oxygen-alkali solution filter 6 to remove mechanical impurities, and is cooled by an oxygen-alkali solution cooler 8. The resulting electrolyte is then fed into the electrolytic cell 1 via the first oxygen-alkali solution inlet pipeline 16-1 and the second oxygen-alkali solution inlet pipeline 16-2.

[0076] The generated hydrogen and oxygen are discharged from the outlets of hydrogen separator 3 and oxygen separator 2, respectively, and after water vapor is removed and the temperature is lowered by hydrogen condenser 11 and oxygen condenser 12, they are sent out as products.

[0077] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific functions and working processes described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and these all fall within the scope of protection of the present invention.

Claims

1. An alkaline water electrolysis hydrogen production system, characterized in that: Applicable to photovoltaic and wind power generation plants, including an electrolytic cell (1), wherein the electrolytic cell includes a left end plate (2-1) and a right end plate (2-2) arranged parallel to each other, and the left end plate and the right end plate are fixedly connected by multiple tie bolts. The feature is that: between the left end plate and the right end plate and from left to right, a left end partition plate (2-4), a left partition plate unit (2-6) composed of several partition plate units stacked together, a middle partition plate (2-8), a right partition plate unit (2-7) composed of several partition plate units stacked together, and a right end partition plate (2-5) are installed in sequence. The middle partition plate is a frame structure, and the positive transmission end (2-16) welded to the middle partition plate is connected to the positive terminal of the power supply; the first negative transmission end welded to the left end partition plate and the second negative transmission end welded to the right end partition plate are respectively connected to the negative terminal of the power supply. Each partition unit includes a partition frame (3-1), and a partition core (3-2) is welded inside the partition frame; the partition core (3-2) includes a corrugated plate structure; the partition unit, the middle partition, the left end partition, the right end partition, and the left end plate and the right end plate are rectangular; A diaphragm electrode assembly is clamped between the left and right partition units of two adjacent partition units. The diaphragm electrode assembly consists of a cathode (4-4), a diaphragm (4-5), and an anode (4-6) that are pressed together from left to right. The diaphragm electrode assembly divides the space between the two partition units into two independent chambers. The chamber containing the cathode is the hydrogen electrolysis chamber (4-7), and the chamber containing the anode is the oxygen electrolysis chamber (4-8). The electrolyte includes raw water and auxiliary material potassium hydroxide. Oxygen alkali inlets and hydrogen alkali inlets are respectively opened on the front and rear sides of the lower part of the left partition (2-4) and right partition (2-5). Hydrogen alkali outlets and oxygen alkali outlets are respectively opened on the front and rear sides of the upper part of the left and right partitions. Hydrogen alkali guide channels (3-3) and oxygen alkali guide channels (3-5) are respectively opened on the lower parts of the front and rear frames of all partition frames at the middle partition (2-8), the left partition unit (2-6), and the right partition unit. The lower horizontal frame of all partition frames of the plate unit has hydrogen alkali inlet channels (3-4) and oxygen alkali inlet channels (3-6) on the front and rear sides respectively. The upper horizontal frame of all partition frames at the middle partition (2-8), the left partition unit (2-6), and the right partition unit has oxygen alkali outlet channels (3-8) and hydrogen alkali outlet channels (3-7) on the front and rear sides respectively. The hydrogen alkali channels at the left partition unit and the middle partition are interconnected; the oxygen alkali channels are interconnected; the hydrogen alkali inlet channels are interconnected; and the oxygen alkali inlet channels are interconnected. The hydrogen alkali solution guiding channels at the right partition unit and the middle partition are interconnected, the hydrogen alkali solution inlet channels are interconnected, the oxygen alkali solution guiding channels are interconnected, and the oxygen alkali solution inlet channels are interconnected. The hydrogen-alkali solution guiding channel, hydrogen-alkali solution inlet channel, oxygen-alkali solution guiding channel, and oxygen-alkali solution inlet channel on the intermediate partition are all openings that communicate with the inner edge of the frame at corresponding positions of the intermediate partition; the hydrogen-alkali solution guiding cover (5-1) and the oxygen-alkali solution guiding cover (5-2) are respectively welded to the frame of the intermediate partition, and the hydrogen-alkali solution guiding channel and the hydrogen-alkali solution inlet channel on the intermediate partition are connected to the hydrogen-alkali solution guiding cover; the oxygen-alkali solution guiding channel and the oxygen-alkali solution inlet channel are connected to the oxygen-alkali solution guiding cover; The hydrogen alkali solution inlet channel and the hydrogen alkali solution outlet channel on each partition unit are connected to the cathode chamber through a liquid passage opened on the partition frame, and the oxygen alkali solution inlet channel and the oxygen alkali solution outlet channel are connected to the anode chamber through a liquid passage opened on the partition frame. One side of the oxygen-alkali inlet and the hydrogen-alkali inlet on the left and right partitions are respectively connected to the oxygen-alkali liquid guiding channel and the hydrogen-alkali liquid guiding channel on the nearest partition unit, and the other side is respectively connected to one end of the oxygen-alkali liquid inlet pipe and the hydrogen-alkali liquid inlet pipe. One side of the oxygen-alkali outlet and the hydrogen-alkali outlet on the left and right partitions are respectively connected to the oxygen-alkali liquid outlet channel and the hydrogen-alkali liquid outlet channel on the nearest partition unit. The other side of each oxygen-alkali liquid outlet and each hydrogen-alkali liquid outlet is respectively connected to one end of the oxygen-alkali liquid outlet pipeline and the hydrogen-alkali liquid outlet pipeline. The other ends of the two hydrogen-alkali solution outlet pipelines are connected in sequence to the hydrogen separator (3), hydrogen-alkali solution circulation pump (5), hydrogen-alkali solution filter (7), hydrogen-alkali solution cooler (9), and two hydrogen-alkali solution inlet pipelines via the first circulation pipeline. The outlet of the hydrogen separator is connected to the hydrogen condenser (11). The other ends of the two oxygen-alkali solution outlet pipelines are connected in sequence to the oxygen separator (2), oxygen-alkali solution circulation pump (4), oxygen-alkali solution filter (6), oxygen-alkali solution cooler (8), and two oxygen-alkali solution inlet pipelines via the second circulation pipeline. The outlet of the oxygen separator is connected to the oxygen condenser (12). The bottom of the hydrogen separator is connected to the bottom of the oxygen separator via a pipeline and is connected to the auxiliary device. The hydrogen-alkali solution cooler and the oxygen-alkali solution cooler use air as the cold source.

2. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The corrugated plate structure is a single-sided corrugated plate structure, and the partition unit, middle partition, left end partition, right end partition, left end plate and right end plate are rectangular.

3. The alkaline water electrolysis hydrogen production system according to claim 2, characterized in that: The distance between adjacent wave crests of the single-sided corrugated plate structure is 8 to 30 mm, and the height difference between the peaks and valleys of the corrugations is 8 to 30 mm.

4. The alkaline water electrolysis hydrogen production system according to claim 3, characterized in that: When the crests of a single-sided corrugated plate structure are projected onto a vertical plane as continuous broken lines, the parameters of the single-sided corrugated plate structure are set as follows: the tilt angle α1 formed by the crest and the vertical axis of the plate is 0 < α1 ≤ 45°, the interior angle α2 of the crest or trough formed along the vertical axis of the plate is > 90 degrees, and the interior angle α3 of the crest or trough formed along the thickness direction of the plate is between 45° and 135°.

5. The alkaline water electrolysis hydrogen production system according to claim 3, characterized in that: When the crests of a single-sided corrugated plate structure are projected onto a vertical plane as continuous straight lines, the interior angle α4 of the crests or troughs formed along the thickness direction of the plate is 45° to 135°.

6. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that: In the cross-sectional direction of the partition core, the corrugations of the single-sided corrugated plate structures on the two partition cores stacked on the left and right are inclined in opposite directions, so that the peaks of the two single-sided corrugated plate structures are opposite to each other and intersect to form a three-dimensional mesh structure.

7. The alkaline water electrolysis hydrogen production system according to claim 2, characterized in that: The partition core also includes a flat plate (9-3), and the corrugated plate structure includes a left corrugated plate structure (9-1) and a right corrugated plate structure (9-2). The left corrugated plate structure (9-1) and the right corrugated plate structure (9-2) are respectively fixed on the left and right side walls of the flat plate. The partition unit, the middle partition, the left end partition, the right end partition, the left end plate, and the right end plate are rectangular.

8. The alkaline water electrolysis hydrogen production system according to claim 7, characterized in that: The angle between the crest of the corrugated plate structure on the left and the vertical axis of the plate is 0 < α5 ≤ 45°; the interior angle of the crest or trough formed along the thickness direction of the plate is 45° to 135°; the distance between adjacent crests of the corrugations is 8 to 20 mm; and the height difference between the crests and troughs of the corrugations is 3 to 15 mm.

9. The alkaline water electrolysis hydrogen production system according to claim 7, characterized in that: The single-sided corrugated plate structure, as well as the flat plate, the left corrugated plate structure, and the right corrugated plate structure, are made of nickel-plated carbon steel plates or nickel plates. When nickel-plated carbon steel is used, the coating thickness is 40-120μm. If the left corrugated plate structure and the right corrugated plate structure are made of metal mesh pressed into a corrugated structure, the metal mesh is 4-30 mesh, and the wire diameter of the woven metal mesh is 1-0.2mm.

10. The alkaline water electrolysis hydrogen production system according to claim 7 or 8, characterized in that: A spare pipeline equipped with a valve is connected between the first and second circulation pipelines located at the inlets of the hydrogen alkali circulation pump and the oxygen alkali circulation pump, between the first and second circulation pipelines located at the outlets of the hydrogen alkali circulation pump and the oxygen alkali circulation pump, between the first and second circulation pipelines located at the inlets of the hydrogen alkali cooler and the oxygen alkali cooler, and between the first and second circulation pipelines located at the outlets of the hydrogen alkali cooler and the oxygen alkali cooler. A support bracket is provided at the bottom of the middle partition, and several support partitions are provided at the left and right partition units respectively; sealing gaskets are installed between all partition units and between partition units and the right, middle, and left partitions; the thickness of the middle partition is 60-150mm; the length of the partition frame is 1.5-6m, the width is 1-4.5m, and the thickness is 10-30mm; the length of the partition core is 1.4-5.5m and the width is 0.9-4m; the thickness of the plates in the single-sided corrugated plate structure, flat plate, left-side corrugated plate structure, and right-side corrugated plate structure is 0.3-2mm.

Images