Water electrolysis hydrogen production system and hydrogen production method

Abstract

The invention relates to the field of water electrolysis hydrogen production, in particular to a water electrolysis hydrogen production system. Comprising an electrolytic bath, a hydrogen heat exchanger, an oxygen heat exchanger, a hydrogen gas-liquid separator, an oxygen gas-liquid separator, a hydrogen purity detector and an oxygen purity detector, wherein the hydrogen heat exchanger and the oxygen heat exchanger are communicated with the electrolytic bath; the hydrogen gas-liquid separator is communicated with the hydrogen heat exchanger; the oxygen gas-liquid separator is communicated with the oxygen heat exchanger; the device comprises a hydrogen purity detector, an oxygen purity detector, a hydrogen storage tank communicated with the hydrogen purity detector, an oxygen storage tank communicated with the oxygen purity detector, a treatment box body for electrolyte to enter and internally provided with activated carbon to adsorb suspended solids and organic matters, and a precipitation tank communicated with the treatment box body and used for heating the electrolyte in the treatment box body, the resin tank is communicated with the settling tank and the electrolytic bath and is used for exchanging calcium and magnesium ions in the electrolyte, so that the electrolyte fed into the electrolytic bath is not easy to generate corresponding impurities in the electrolytic bath, and the influence on the efficiency of producing hydrogen by electrolyzing water is reduced.

Description

Technical Field

[0001] The present application relates to the field of water electrolysis hydrogen production, and in particular to a water electrolysis hydrogen production system and a hydrogen production method. Background Art

[0002] Hydrogen production by water electrolysis is an environmentally friendly and safe way to obtain hydrogen, a green energy source. There are many methods for hydrogen production by water electrolysis. Among them, AEM water electrolysis hydrogen production, that is, hydrogen production using anion exchange membrane, has the advantages of higher efficiency and smaller equipment size compared to general alkaline water electrolysis hydrogen production. At the same time, compared with PEM water electrolysis hydrogen production, that is, hydrogen production using proton exchange membrane, it has lower costs and broad development prospects in the future.

[0003] The existing AEM water electrolysis hydrogen production can use tap water or weak alkaline solution for electrolysis. The electrolyte is sent to the electrolytic cell for electrolysis. The generated hydrogen and oxygen are sent to the corresponding gas-liquid separators for separation, and then sent to the gas storage cylinder after the corresponding purity test. For example, an AEM water electrolysis hydrogen production integrated integrated device with announcement number CN220099216U.

[0004] Regarding the above-mentioned related technologies, although tap water or the weak alkaline solution prepared using it is low in cost and easy to use, it contains a certain amount of calcium and magnesium ions. If it is fed into the electrolytic cell for a long time, scale will form on the inner wall of the electrolytic cell and the electrodes, which will easily affect the efficiency of hydrogen production by electrolysis of water. Summary of the invention

[0005] In order to reduce the impact on the efficiency of hydrogen production by water electrolysis, the present application provides a water electrolysis hydrogen production system and a hydrogen production method.

[0006] In a first aspect, the present application provides a water electrolysis hydrogen production system that adopts the following technical solution.

[0007] A water electrolysis hydrogen production system comprises an electrolytic cell for electrolyzing water to form hydrogen and oxygen, a hydrogen heat exchanger connected to the electrolytic cell and cooling hydrogen and an oxygen heat exchanger for cooling oxygen, a hydrogen gas-liquid separator connected to the hydrogen heat exchanger to separate hydrogen from condensate, an oxygen gas-liquid separator connected to the oxygen heat exchanger to separate oxygen from condensate, a hydrogen purity detector connected to the hydrogen gas-liquid separator to detect the purity of hydrogen, an oxygen purity detector connected to the oxygen gas-liquid separator to detect the purity of oxygen, a hydrogen gas storage tank connected to the hydrogen purity detector to collect hydrogen, an oxygen gas storage tank connected to the oxygen purity detector to collect oxygen, a treatment box into which electrolyte enters and is provided with activated carbon to adsorb suspended matter and organic matter, a precipitation tank connected to the treatment box to heat the electrolyte inside, and a resin tank connected to the precipitation tank and the electrolytic cell to exchange calcium and magnesium ions in the electrolyte.

[0008] By adopting the above technical solution, before using tap water for electrolysis, the resin tank will remove calcium and magnesium ions in the tap water, and before the tap water enters the resin tank, the suspended matter and organic matter will be removed as much as possible, and the sedimentation tank can first remove most of the calcium and magnesium ions in the tap water, so as to reduce the frequency of stopping the electrolysis of water to replace the ion exchange resin in the resin tank, which helps to improve the efficiency of hydrogen production by electrolysis of water.

[0009] Optionally, two processing boxes are provided, and a COD sensor and a suspended matter sensor are provided at one side of the processing box connected to the sedimentation tank. The COD sensor and the suspended matter sensor are electrically connected to a controller. The water inlets of the two processing boxes are connected to the same water inlet three-way valve, and the water outlets of the two processing boxes are connected to the same water outlet three-way valve. The water inlet three-way valve and the water outlet three-way valve are electrically connected to the controller.

[0010] By adopting the above technical solution, when the activated carbon in the treatment box needs to be replaced, the water inlet three-way valve and the water outlet three-way valve can be switched, so that the high replacement frequency of the activated carbon will not easily cause a significant impact on the electrolysis of water to produce hydrogen.

[0011] Optionally, the upper portion of the precipitation tank is connected to an alkali adding tube for adding a mixed solution of carbonate and hydroxide, the precipitation tank is fixedly connected to a partition for allowing electrolyte to pass through from the lower portion, the bottom of the precipitation tank is connected to a ventilation pipe for introducing inert gas into the electrolyte, a plurality of air outlets are evenly arranged on the inner wall of the precipitation tank on a side of the partition away from the precipitation tank connected to the resin tank, the bottom of the partition is also formed with an air outlet for releasing inert gas toward the side of the partition facing the air outlet, and the ventilation pipe and the alkali adding tube are located on a side of the partition facing the precipitation tank connected to the processing box.

[0012] By adopting the above technical scheme, a certain amount of alkali solution, i.e., a mixed solution of carbonate and hydroxide, is added to the water, so that as many calcium and magnesium ions in the tap water as possible can form precipitates in the sedimentation tank. At the same time, the solution flows upward on the inner wall of the sedimentation tank and the partition toward the side where the alkali solution is added, driven by inert gas, so that the alkali solution and the tap water are more fully mixed. The partition can prevent the tap water and alkali solution that are not fully mixed from being easily discharged directly from the sedimentation tank, so that as many calcium and magnesium ions in the tap water as possible can form precipitates in the sedimentation tank.

[0013] Optionally, the sedimentation tank is detachably connected to a slag passing platform, the slag passing platform is formed with a slag passing cavity, the slag passing cavity is penetrated by a slag passing port for fine sediment to pass through, two mesh boxes for receiving sediment and blocking the sediment from passing through are placed in the slag passing cavity, and the bottom of the sedimentation tank is detachably connected to a tank door that can be opened to clean the sediment.

[0014] By adopting the above technical solution, the sediment at the bottom of the sedimentation tank enters the mesh box, so that the sediment can be cleaned without opening the tank door, thereby reducing the frequency of stopping the electrolysis of water to produce hydrogen for sediment cleaning.

[0015] Optionally, a vertical frame is provided around the sedimentation tank, the vertical frame is rotatably connected to a rotating frame, the vertical frame is provided with a rotating frame motor for driving the rotating frame to rotate, the rotating frame is detachably connected to four box-changing cylinders, the four box-changing cylinder power rods are detachably connected to four groups of box rods one by one, the four groups of box rods are detachably connected to four net boxes one by one, two net boxes are located in the sedimentation tank and the other two net boxes are located outside the sedimentation tank.

[0016] By adopting the above technical solution, the efficiency of taking out the net box is improved, and the amount of sediment in the slag passing chamber is reduced as much as possible, so that the net box can be put back into the slag passing chamber more smoothly.

[0017] Optionally, two heating pipes are provided in the slag passing platform, and the two heating pipes are connected to the hydrogen heat exchanger and the oxygen heat exchanger in a one-to-one correspondence.

[0018] By adopting the above technical solution, the temperature at the slag table and the mesh box is increased, so that the precipitate is formed at the slag table and the mesh box as much as possible, and the heat of the hydrogen and oxygen with a higher temperature sent out of the electrolytic cell can be used for heating, saving energy.

[0019] Optionally, a lower slag inclined surface is formed on the upper surface of the slag passing platform surrounding the slag passing cavity, the rotating frame is detachably connected to a descaling cylinder, the descaling cylinder power rod is detachably connected to an end rod, the end rod is rotatably connected to a cross rod, the end rod is provided with an end rod motor for driving the cross rod to rotate, the cross rod is plugged and slidably connected to a scraper rod, the end of the scraper rod is in contact with the lower slag inclined surface, a compression spring is detachably connected between the cross rod and the scraper rod to force the scraper rod away from the rotating shaft, the rotating frame is fixedly connected to a rod rail that can abut or be close to the upper surface of the sedimentation tank, and the end of the scraper rod can enter into the rod rail.

[0020] By adopting the above technical solution, the sediment on the lower slag slope can be removed as much as possible, and the presence of the compression spring ensures that the rotation axis of the scraper rod can be tightly attached to the inner wall of the sedimentation tank even if it is inconsistent with the center line of the inner circle of the sedimentation tank. The rail rod allows the scraper rod to enter the sedimentation tank and move out of the sedimentation tank.

[0021] Optionally, each of the box rods is slidably connected to the inside with a group of two clamping rods, which are inserted into one end of the net box in an L shape, and two clamping rods in the same group that are far away from each other can be inserted into the net box so that the net box moves synchronously with the box rods, and the clamping rods are hinged with a driving part, and two adjacent driving parts are a group and hinged to each other. The upper part of the box rod is detachably connected with a power rod hinged to the clamping rod electric cylinder at the hinge of the two adjacent driving parts, and a clamping rod spring is provided between the two clamping rods in the same group to force the two clamping rods to move away from each other.

[0022] By adopting the above technical solution, after the mesh box is placed in the slag passing chamber, the box rod can be easily separated from the mesh box, and when the scraper rod scrapes off the sediment on the lower slag slope, the mesh box can receive it to a certain extent.

[0023] Optionally, the sedimentation tank is connected to the same circulation pipe at two positions on the side of the partition facing the gas outlet. The circulation pipe body is provided with a circulation pump that pumps the electrolyte at the bottom of the sedimentation tank to the top of the sedimentation tank, and the slag passing platform is located between the upper and lower ends of the circulation pipe.

[0024] By adopting the above technical solution, after the net box is taken out of the sedimentation tank, the circulation pipe circulates the solution at the bottom and upper part of the sedimentation tank, so that the liquid in the slag chamber flows from bottom to top, so that some sediment that is scraped off by the scraper rod and enters the slag chamber can be driven through the slag outlet, so that the position of the net box when it is subsequently put back into the slag chamber is not prone to deviation, and when the net box needs to be taken out of the sedimentation tank later, the box rod can smoothly correspond to the net box.

[0025] In a second aspect, the present application provides a method for producing hydrogen by electrolysis of water, which adopts the following technical solution.

[0026] A method for producing hydrogen by electrolysis of water, using the above-mentioned system for producing hydrogen by electrolysis of water, specifically comprises the following steps.

[0027] Step 1: Pump tap water into the treatment tank to remove suspended solids and organic matter in the water; Step 2: The tap water in the treatment box enters the precipitation tank so that most of the calcium and magnesium ions form precipitates and are configured into a weak alkaline electrolyte; Step 3, the electrolyte in the precipitation tank is sent into the resin tank to remove the remaining calcium and magnesium ions; Step 4, the electrolyte in the resin tank is fed into an electrolytic cell for electrolysis to generate hydrogen and oxygen at electrodes on both sides of the electrolytic cell respectively; Step 5, oxygen and hydrogen in the electrolyzer are respectively sent out for cooling; Step 6: The cooled hydrogen and oxygen are separated into gas and liquid respectively; Step 7: After the gas-liquid separation, the hydrogen and oxygen are stored separately after the purity is tested and meets the standards.

[0028] By adopting the above technical solution, calcium and magnesium ions, organic matter and suspended matter in tap water are removed before electrolysis of tap water, so that the maintenance frequency of the electrolytic cell is reduced, which helps to improve the efficiency of hydrogen production by electrolysis of water.

[0029] In summary, the present application includes at least the following beneficial effects: Before using tap water for electrolysis, the resin tank will remove calcium and magnesium ions from the tap water, and before the tap water enters the resin tank, suspended solids and organic matter will be removed as much as possible. The sedimentation tank can first remove most of the calcium and magnesium ions in the tap water to reduce the frequency of stopping the electrolysis of water to replace the ion exchange resin in the resin tank, which helps to improve the efficiency of hydrogen production by electrolysis of water. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a piping system for producing hydrogen by electrolysis of water in the present application; Figure 2 It is a system block diagram for switching the water inlet three-way valve and the water outlet three-way valve; Figure 3 It is a schematic diagram of the structure at the sedimentation tank; Figure 4 It is a structural schematic diagram of a scraper rod and a sedimentation tank in partial cross-section; Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0031] Explanation of the reference numerals: 1. electrolytic cell; 11. driving member; 12. electric cylinder for clamping rod; 13. spring for clamping rod; 14. circulation pipe; 15. circulation pump; 16. tank door; 2. hydrogen heat exchanger; 21. rotating frame motor; 22. compression spring; 23. end rod; 24. end rod motor; 25. rod rail; 26. heating pipe; 27. air outlet; 28. rotating frame; 29. ​​clamping rod; 3. oxygen heat exchanger; 31. slag lowering slope; 32. mesh box; 33. stand; 34. box changing cylinder; 35. box rod; 36. descaling gas Cylinder; 38. Crossbar; 39. Scraper; 4. Hydrogen gas-liquid separator; 41. Controller; 42. Water inlet three-way valve; 43. Water outlet three-way valve; 44. Alkali adding pipe; 45. Baffle; 46. Ventilation pipe; 47. Slag platform; 48. Slag cavity; 49. Slag outlet; 5. Oxygen gas-liquid separator; 51. Hydrogen purity detector; 52. Oxygen purity detector; 53. Hydrogen gas storage tank; 54. Oxygen gas storage tank; 55. Processing box; 56. Sedimentation tank; 57. Resin tank; 58. COD sensor; 59. Suspended matter sensor. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings.

[0033] The present application discloses a system for producing hydrogen by electrolysis of water. Figure 1, including an electrolytic cell 1 for electrolyzing tap water using an anion exchange membrane, and the two opposite sides of the electrolytic cell 1 are connected to a hydrogen heat exchanger 2 and an oxygen heat exchanger 3 in correspondence, so as to reduce the temperature of hydrogen and oxygen obtained by electrolysis for subsequent storage, and also to condense the gasified electrolyte. The hydrogen heat exchanger 2 is connected to a hydrogen gas-liquid separator 4, and the oxygen heat exchanger 3 is connected to an oxygen gas-liquid separator 5, so that both hydrogen and oxygen can be separated from the corresponding condensed electrolyte. The hydrogen gas-liquid separator 4 is connected to a hydrogen purity detector 51, and the oxygen gas-liquid separator 5 is connected to an oxygen purity detector 52, so as to perform real-time online detection of the purity of the corresponding hydrogen and oxygen delivered. The hydrogen purity detector 51 is connected to a hydrogen gas storage tank 53, and the oxygen purity detector 52 is connected to an oxygen gas storage tank 54, so as to store hydrogen and oxygen with qualified purity.

[0034] Reference Figure 1 and Figure 2 The water pipe is connected to a water inlet three-way valve 42 which can be a solenoid valve. Both ends of the water inlet three-way valve 42 away from the water pipe are connected to a treatment box 55. Activated carbon is placed in the treatment box 55 to remove suspended matter and organic matter in the tap water. The water outlets of the two processing boxes 55 are connected with the same water outlet three-way valve 43 which can be a solenoid valve. The inside of the processing box 55 is connected to the side of the water outlet three-way valve 43, and a COD sensor 58 and a suspended matter sensor 59 are detachably connected. The water inlet three-way valve 42, the water outlet three-way valve 43, the COD sensor 58 and the suspended matter sensor 59 are electrically connected with the controller 41. When the COD sensor 58 and the suspended matter sensor 59 detect that the concentration of suspended matter and organic matter in the tap water after activated carbon filtration exceeds the preset concentration threshold value in the controller 41, the water inlet three-way valve 42 and the water outlet three-way valve 43 are switched, and the corresponding sound and light alarm is activated for prompting. When the activated carbon is replaced, there is no need to stop the hydrogen production process, so that the activated carbon with a higher replacement frequency is not easy to have a significant impact on the efficiency of hydrogen production by electrolysis of water.

[0035] Reference Figure 1 and Figure 3, one end of the outlet three-way valve 43 away from the treatment box 55 is connected to a sedimentation tank 56, and the upper part of the sedimentation tank 56 is connected to an alkali adding pipe 44 for adding alkali solution, and the alkali solution can be a mixed solution of carbonate and hydroxide, such as a weak alkali solution composed of sodium carbonate and sodium hydroxide, so that calcium and magnesium ions in tap water are precipitated as much as possible in the sedimentation tank, and the alkali solution and tap water are mixed to form an electrolyte. And the vertical inner wall at the top of the sedimentation tank 56 is fixedly connected with a partition 45, and the liquid level in the sedimentation tank 56 is lower than the upper part of the partition 45, so that the liquid in the sedimentation tank 56 can only pass through the lower part of the partition 45, and the position of the sedimentation tank 56 connected to the outlet three-way valve 43 and the alkali adding pipe 44 is located at the upper part of the same side of the partition 45, and the opening of the sedimentation tank 56 for sending out the electrolyte is located at the upper part of the side of the partition 45 away from the alkali adding pipe 44 connected to the sedimentation tank 56, so that calcium and magnesium ions are precipitated in the sedimentation tank 56 as much as possible.

[0036] Reference Figure 4 The inner wall of the sedimentation tank 56 is evenly formed with several air outlets 27 around its own vertical center line. The air outlet 27 is located on the side of the partition 45 facing the sedimentation tank 56 connected to the alkali adding tube 44. Several air outlets 27 are also formed on the vertical side of the bottom of the partition 45. The air outlet 27 is connected to a vent pipe 46. The vent pipe 46 is connected to an external compressor and a gas cylinder to deliver inert gas into the sedimentation tank 56, and the inert gas moves upward along the inner wall of the sedimentation tank 56 and the surface of the partition 45. On the one hand, it forces the solution in the sedimentation tank 56 located on the side of the partition 45 facing the alkali adding tube 44 to flow to a certain extent, thereby accelerating the mixing of the alkali solution and the tap water. At the same time, it can also speed up the flow rate of the solution on the inner wall and the partition of the sedimentation tank 56, so that it is not easy to form adherent precipitates on the surface.

[0037] Reference Figure 4A slag passing platform 47 is detachably connected to the bottom of the sedimentation tank 56, and a lower slag slope 31 is formed around the vertical center line of the sedimentation tank 56. The lower slag slope 31 is higher as it is farther away from the vertical center line of the sedimentation tank 56. A slag passing cavity 48 is provided at the center of the upper surface of the slag passing platform 47, and the vertical center line of the slag passing cavity 48 is consistent with the vertical center line of the sedimentation tank 56. A plurality of long slag passing openings 49 are formed through the bottom surface of the slag passing cavity 48, and two mesh boxes 32 can be placed in the slag passing cavity 48. The two mesh boxes 32 can be moved vertically upward to be taken out of the sedimentation tank 56, and an opening is provided at the bottom of the mesh box 32 for the solution to pass through. The slag platform 47 is connected to two heating pipes 26, which are arranged around the slag platform 47. The two heating pipes 26 are connected to the hydrogen heat exchanger 2 and the oxygen heat exchanger 3 in a one-to-one correspondence, so that the heat of the high-temperature hydrogen and oxygen sent from the electrolytic cell 1 can be used to heat the slag platform 47 and the mesh box 32, so that as much sediment as possible is generated on the lower slag slope 31 and the mesh box 32. In addition, the heating pipe 26 can also be provided with an electric heater to further heat the heat transfer fluid flowing to the slag platform 47, so that the temperature of the slag platform 47 and the mesh box 32 reaches a higher value.

[0038] Reference Figure 3 A stand 33 is placed on the ground around the sedimentation tank 56. A rotating frame 28 with a vertical axis of rotation is rotatably connected to the upper part of the stand 33. A rotating frame motor 21 for driving the rotating frame 28 to rotate is detachably connected to the upper part of the stand 33. A descaling cylinder 36 with a vertical power rod is detachably connected to the rotating frame 28. The bottom end of the power rod of the descaling cylinder 36 is detachably connected to the end rod 23. The end rod 23 is rotatably connected to a horizontal cross bar 38. The end rod motor 24 is detachably connected to the upper cavity of the end rod 23. The end rod motor 24 can drive the cross bar 38 to rotate via a reduction gear box. The cross bar 38 is plugged and slidably connected with a scraper rod 39 along its length direction. The end face of the scraper rod 39 can fit the lower slag slope 31. At the same time, a ball can be set on the end face of the scraper rod 39 so that the scraper rod 39 can move close to the inner wall of the sedimentation tank 56.

[0039] Reference Figure 4, a compression spring 22 is provided inside the scraper rod 39 to force the scraper rod 39 to be away from the cross bar 38, so that even if the rotation axis of the cross bar 38 is not consistent with the axis of the sedimentation tank 56, the scraper rod 39 can be well attached to the lower slag slope during the process of rotating around the axis of the cross bar 38. In addition, the rotating frame 28 is detachably connected to two vertical rod rails 25, and the scraper rod 39 can move vertically in the rod rails 25, so that when the rod rails 25 are close to the upper surface of the sedimentation tank 56, the scraper rod 39 can move vertically between the rod rails 25 and the inner wall of the sedimentation tank 56. In addition, when the net box 32 is placed in the slag chamber 48, the height of the highest point of the net box 32 is lower than the lowest point of the lower slag slope 31, so that the scraper rod 39 is not easy to collide with the net box 32. In addition, the scraper rod 39 enters the sedimentation tank 56 from the side of the partition 45 away from the gas outlet 27.

[0040] Reference Figure 4 and Figure 5 The rotating frame 28 is detachably connected with two groups of two box-changing cylinders 34 in each group. The bottom end of the power rod of each box-changing cylinder 34 can be detachably connected with a group of box rods 35. Each group of box rods 35 can be provided with four, and each group of box rods 35 can correspond to a mesh box 32. A group of two clamping rods 29 are slidably connected in the horizontal direction in each box rod 35. The bottom ends of the clamping rods 29 are L-shaped, and the bottom horizontal sections of the two clamping rods 29 in the same group are far away from each other, so that when the two clamping rods 29 in the same group are close to each other, the two clamping rods 29 can be inserted into the upper surface of the mesh box 32 in the vertical direction; when the two clamping rods 29 in the same group are far away from each other, the bottom horizontal section of the clamping rod 29 can be inserted into the mesh box 32 in the horizontal direction, so that the mesh box 32 can move with the clamping rods 29. Several clamping rod springs 13 are evenly distributed between the two clamping rods 29 in the same group in the vertical direction. The clamping rod springs 13 force the two clamping rods 29 in the same group to move away from each other more smoothly. At the same time, the upper ends of the two clamping rods 29 in the same group are hinged with driving parts 11, and the ends of the two driving parts 11 away from the clamping rods 29 are hinged. The hinge axes at both ends of the driving parts 11 are horizontal and perpendicular to the moving direction of the clamping rods 29. The upper part of each box rod 35 can be detachably connected with a clamping rod electric cylinder 12 with a vertical power rod. The bottom end of the power rod of the clamping rod electric cylinder 12 is hinged to the upper end of the driving part 11, so that the clamping rod electric cylinder 12 can drive the corresponding two clamping rods 29 to move closer or farther away, so as to take the net box 32 out of or put it into the sedimentation tank 56 to remove the sediment.

[0041] Reference Figure 3 and Figure 4A circulation pipe 14 is connected between the upper and lower parts of the sedimentation tank 56. The circulation pipe 14 is detachably connected to a circulation pump 15. The circulation pump 15 delivers the solution in the lower part of the sedimentation tank 56 to the upper part of the sedimentation tank 56. The height of the slag platform 47 is located between the heights of the upper and lower ends of the circulation pipe 14 connected to the sedimentation tank 56, so that after the net box 32 is removed from the sedimentation tank 56, there will be some sediment scraped off by the scraper rod 39 in the slag chamber 48. For this reason, the circulation pump 15 is operated to make the solution in the slag chamber 48 have a relatively obvious flow from top to bottom, so as to bring the sediment from the slag port 49 to the bottom of the sedimentation tank 56, so that the new net box 32 can be smoothly put back into the slag chamber 48. In addition, a tank door 16 is detachably connected to the bottom of the sedimentation tank 56. The tank door 16 is opened to remove the sediment accumulated at the bottom of the sedimentation tank 56.

[0042] Reference Figure 1 The upper water outlet of the sedimentation tank 56 away from the water outlet three-way valve 43 is connected to a resin tank 57, and the resin tank 57 is filled with ion exchange resin, so that even if some calcium and magnesium ions are contained in the electrolyte sent out from the sedimentation tank 56, they will be replaced by the ion exchange resin, so that the calcium and magnesium ions in the electrolyte sent into the electrolytic cell 1 can be removed as fully as possible, and the replacement frequency of the ion exchange resin in the resin tank 57 can also be reduced.

[0043] The implementation principle of the water electrolysis hydrogen production system of the embodiment of the present application is as follows: the tap water first passes through the treatment box 55, the sedimentation tank 56 and the resin tank 57 in sequence to remove organic matter, suspended matter and calcium and magnesium ions in the tap water as much as possible, and then the electrolyte prepared with tap water is electrolyzed in the electrolytic cell 1 to generate hydrogen and oxygen, and the hydrogen and oxygen are then cooled, gas-liquid separated and purity tested respectively, and finally the qualified hydrogen and oxygen are stored respectively.

[0044] The embodiment of the present application also discloses a method for producing hydrogen by electrolysis of water, which specifically includes the following steps.

[0045] Step 1, pumping tap water into the treatment box 55 to remove suspended solids and organic matter in the water; Step 2: The tap water in the treatment box 55 enters the precipitation tank 56 so that most of the calcium and magnesium ions form precipitates and are configured into a weak alkaline electrolyte; Step 3, the electrolyte in the precipitation tank 56 is sent to the resin tank 57 to remove the remaining calcium and magnesium ions; Step 4, the electrolyte in the resin tank 57 is fed into the electrolytic cell 1 for electrolysis to generate hydrogen and oxygen at the electrodes on both sides of the electrolytic cell 1 respectively; Step 5, oxygen and hydrogen in the electrolytic cell 1 are respectively sent out for cooling; Step 6: The cooled hydrogen and oxygen are separated into gas and liquid respectively; Step 7: After the gas-liquid separation, the hydrogen and oxygen are stored separately after the purity is tested and meets the standards.

[0046] The implementation principle of the method for producing hydrogen by electrolysis of water in an embodiment of the present application is: first, the suspended matter, organic matter and as much calcium and magnesium ions as possible in the tap water are fully removed, and then the residual calcium and magnesium ions are fully removed by ion exchange resin. While ensuring that the electrolyte sent to the electrolytic cell 1 is not prone to contain calcium and magnesium ions, there is no need to replace the ion exchange resin in the resin tank 57 at a high frequency.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water electrolysis hydrogen production system, characterized in that: The invention comprises an electrolytic cell (1) for electrolyzing water to form hydrogen and oxygen, a hydrogen heat exchanger (2) connected to the electrolytic cell (1) and for cooling hydrogen, and an oxygen heat exchanger (3) for cooling oxygen, a hydrogen gas-liquid separator (4) connected to the hydrogen heat exchanger (2) and for separating hydrogen from condensate, an oxygen gas-liquid separator (5) connected to the oxygen heat exchanger (3) and for separating oxygen from condensate, a hydrogen purity detector (51) connected to the hydrogen gas-liquid separator (4) and for detecting the purity of hydrogen, and a hydrogen gas-liquid separator (5) connected to the oxygen gas-liquid separator (5) and for detecting the purity of hydrogen. An oxygen purity detector (52) for detecting oxygen purity, a hydrogen storage tank (53) connected to the hydrogen purity detector (51) for collecting hydrogen, an oxygen storage tank (54) connected to the oxygen purity detector (52) for collecting oxygen, a treatment box (55) for allowing electrolyte to enter and having activated carbon therein for adsorbing suspended matter and organic matter, a precipitation tank (56) connected to the treatment box (55) for heating the electrolyte inside, and a resin tank (57) connected to the precipitation tank (56) and the electrolytic cell (1) for exchanging calcium and magnesium ions in the electrolyte.

2. A water electrolysis hydrogen production system according to claim 1, characterized in that: Two treatment boxes (55) are provided. A COD sensor (58) and a suspended matter sensor (59) are provided at one side of the treatment box (55) that is connected to the sedimentation tank (56). The COD sensor (58) and the suspended matter sensor (59) are electrically connected to a controller (41). The water inlets of the two treatment boxes (55) are connected to a common water inlet three-way valve (42). The water outlets of the two treatment boxes (55) are connected to a common water outlet three-way valve (43). The water inlet three-way valve (42) and the water outlet three-way valve (43) are electrically connected to the controller (41).

3. A water electrolysis hydrogen production system according to claim 1, characterized in that: The upper part of the precipitation tank (56) is connected to an alkali adding pipe (44) for adding a mixed solution of carbonate and hydroxide. The precipitation tank (56) is fixedly connected to a partition (45) through which electrolyte passes from the lower part. The bottom of the precipitation tank (56) is connected to a vent pipe (46) for feeding inert gas into the electrolyte. The inner wall of the precipitation tank (56) is located on a side of the partition (45) away from the precipitation tank (56) connected to the resin tank (57) and is evenly provided with a plurality of gas outlets (27). The bottom of the partition (45) is also formed with a gas outlet (27) for releasing inert gas from the side of the partition (45) facing the gas outlet (27). The vent pipe (46) and the alkali adding pipe (44) are located on a side of the partition (45) facing the precipitation tank (56) connected to the processing box (55).

4. A water electrolysis hydrogen production system according to claim 3, characterized in that: The sedimentation tank (56) is detachably connected to a slag-passing platform (47), the slag-passing platform (47) is formed with a slag-passing cavity (48), the slag-passing cavity (48) is penetrated by a slag-passing opening (49) for fine sediment to pass through, two net boxes (32) for receiving sediment and blocking the sediment from passing through are placed in the slag-passing cavity (48), and the bottom of the sedimentation tank (56) is detachably connected to a tank door (16) that can be opened to clean the sediment.

5. A water electrolysis hydrogen production system according to claim 4, characterized in that: A stand (33) is provided around the sedimentation tank (56), the stand (33) is rotatably connected to a rotating frame (28), the stand (33) is provided with a rotating frame motor (21) for driving the rotating frame (28) to rotate, the rotating frame (28) is detachably connected to four box-changing cylinders (34), the power rods of the four box-changing cylinders (34) are detachably connected to four groups of box rods (35) in a one-to-one correspondence, the four groups of box rods (35) are detachably connected to four net boxes (32) in a one-to-one correspondence, two net boxes (32) are located in the sedimentation tank (56) and the other two net boxes (32) are located outside the sedimentation tank (56).

6. A water electrolysis hydrogen production system according to claim 4, characterized in that: Two heating pipes (26) are arranged in the slag passing platform (47), and the two heating pipes (26) are connected to the hydrogen heat exchanger (2) and the oxygen heat exchanger (3) in a one-to-one correspondence.

7. A water electrolysis hydrogen production system according to claim 5, characterized in that: The upper surface of the slag passing platform (47) is formed with a lower slag inclined surface (31) surrounding the slag passing cavity (48); the rotating frame (28) is detachably connected to a descaling cylinder (36); a power rod of the descaling cylinder (36) is detachably connected to an end rod (23); the end rod (23) is rotatably connected to a cross rod (38); the end rod (23) is provided with an end rod motor (24) for driving the cross rod (38) to rotate; the cross rod (38) is plugged and slidably connected to a scraper rod (39); an end of the scraper rod (39) is in contact with the lower slag inclined surface (31); a compression spring (22) for forcing the scraper rod (39) to move away from the rotating shaft (37) is detachably connected between the cross rod (38) and the scraper rod (39); a rod rail (25) capable of abutting or being close to an upper surface of a sedimentation tank (56) is fixedly connected to the rotating frame (28); an end of the scraper rod (39) can enter into the rod rail (25).

8. A water electrolysis hydrogen production system according to claim 7, characterized in that: Each of the box rods (35) is slidably connected to a group of two clamping rods (29) inside, the clamping rod (29) is inserted into one end of the net box (32) in an L shape, and two clamping rods (29) in the same group that are separated from each other can be inserted into the net box (32) so that the net box (32) moves synchronously with the box rod (35), the clamping rod (29) is hinged with a driving member (11), two adjacent driving members (11) form a group and are hinged to each other, the upper part of the box rod (35) is detachably connected with a power rod hinged to a clamping rod electric cylinder (12) at the hinge of the two adjacent driving members (11), and a clamping rod spring (13) for forcing the two clamping rods to move away from each other is provided between the two clamping rods (29) in the same group.

9. A water electrolysis hydrogen production system according to claim 7, characterized in that: The sedimentation tank (56) is connected to a common circulation pipe (14) at two positions on the side of the partition (45) facing the gas outlet (27). The circulation pipe (14) is provided with a circulation pump (15) for pumping electrolyte at the bottom of the sedimentation tank (56) to the top of the sedimentation tank (56). The slag platform (47) is located between the upper and lower ends of the circulation pipe (14).

10. A method for producing hydrogen by electrolysis of water, used in a system for producing hydrogen by electrolysis of water as claimed in any one of claims 1 to 9, characterized in that: The specific steps include: Step 1, pumping tap water into the treatment box (55) to remove suspended matter and organic matter in the water; Step 2: The tap water in the treatment box (55) enters the precipitation tank (56) so that most of the calcium and magnesium ions form precipitates and are configured into a weak alkaline electrolyte; Step 3, the electrolyte in the precipitation tank (56) is sent into the resin tank (57) to remove the remaining calcium and magnesium ions; Step 4, the electrolyte in the resin tank (57) is fed into the electrolytic cell (1) for electrolysis to generate hydrogen and oxygen at electrodes on both sides of the electrolytic cell (1); Step 5, oxygen and hydrogen in the electrolytic cell (1) are respectively sent out for cooling; Step 6: The cooled hydrogen and oxygen are separated into gas and liquid respectively; Step 7: After the gas-liquid separation, the hydrogen and oxygen are stored separately after the purity is tested and meets the standards.

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