Water electrolysis hydrogen production and waste heat utilization system

Abstract

The invention provides a water electrolysis hydrogen production and waste heat utilization system, and relates to the technical field of hydrogen production systems, the water electrolysis hydrogen production and waste heat utilization system comprises a water electrolysis hydrogen production unit and a waste heat utilization unit, the water electrolysis hydrogen production unit comprises an electrolytic bath, a first gas-liquid separation device, a second gas-liquid separation device and a circulating pump, and the electrolytic bath is provided with a hydrogen outlet end and an oxygen outlet end; the oxygen outlet end is connected with the first gas-liquid separation device, and an oxygen outlet end and a first liquid outlet end are arranged in the first gas-liquid separation device; the waste heat utilization unit comprises a cooling device, a heat exchange device and a purification device, the cooling device is connected with the oxygen outlet end in the first gas-liquid separation device, the cooling device is connected with the heat exchange device through a first connecting pipe, and the heat exchange device is connected with the purification device through a second connecting pipe; according to the water electrolysis hydrogen production and waste heat utilization system, multiple treatment units are integrated, effective treatment of oxygen and impurities generated by the electrolytic bath is achieved, environmental pollution is reduced, the energy utilization efficiency is improved, and sustainable development is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production systems, and in particular to a water electrolysis hydrogen production and waste heat utilization system. Background Art

[0002] Hydrogen energy is regarded as the clean energy with the greatest development potential in this century due to its advantages such as wide source of raw materials, high calorific value, zero carbon emission and no pollution. Combining renewable energy generation with water electrolysis to produce hydrogen is one of the most popular research areas in water electrolysis to produce hydrogen. It can promote the consumption of renewable energy and provide a new research path to solve the problems of wind and solar power abandonment. In water electrolysis to produce hydrogen, electrolyzers are required to work.

[0003] The existing Chinese invention patent with publication number CN118207565A discloses a hydrogen production electrolyzer, including a plurality of electrolysis unit modules arranged in sequence, and insulating spacers are arranged between adjacent electrolysis unit modules. Each electrolysis unit module includes a main unit and an auxiliary component. The main component includes a positive electrode element and a negative electrode element. The positive electrode element and the negative electrode element are used to be connected to an external power supply. The main component also includes a medium inlet and a medium outlet. The medium inlet is used to be connected to an external electrolyte source, and the medium outlet is used to be connected to an external collecting mechanism.

[0004] However, in the above technical solution, the hydrogen produced by the electrolyzer can be collected and utilized in a timely manner, but the oxygen produced by the electrolyzer is often directly discharged into the environment. Since the high-temperature oxygen produced by the electrolyzer may carry different impurities, if these impurities are directly discharged into the environment without treatment, it will cause pollution to the environment and affect the air quality. Summary of the invention

[0005] Based on this, in order to solve the problem that the high-temperature oxygen produced by the electrolyzer may carry different impurities, if these impurities are directly discharged into the environment without treatment, it will pollute the environment and affect the air quality. An object of the present invention is to provide a water electrolysis hydrogen production and waste heat utilization system, and its specific technical scheme is as follows:

[0006] A water electrolysis hydrogen production and waste heat utilization system, comprising a water electrolysis hydrogen production unit and a waste heat utilization unit, wherein the water electrolysis hydrogen production unit comprises an electrolyzer, a first gas-liquid separation device, a second gas-liquid separation device and a circulation pump, wherein the electrolyzer is provided with a hydrogen outlet and an oxygen outlet, wherein the oxygen outlet is connected to the first gas-liquid separation device, and the hydrogen outlet is connected to the second gas-liquid separation device, wherein the first gas-liquid separation device is provided with an oxygen outlet and a first liquid outlet, wherein the second gas-liquid separation device is provided with a hydrogen outlet and a second liquid outlet, wherein the inlet of the circulation pump is respectively connected to the first liquid outlet and the second liquid outlet, and the outlet of the circulation pump is connected to the electrolyzer; wherein the waste heat utilization unit comprises a cooling device, a heat exchange device and a purification device, wherein the cooling device is connected to the oxygen outlet in the first gas-liquid separation device, wherein the cooling device is connected to the heat exchange device through a first connecting pipe, and wherein the heat exchange device is connected to the purification device through a second connecting pipe.

[0007] Furthermore, the cooling device includes a cooling box and a ventilation pipe, the ventilation pipe is arranged in the cooling box, the ventilation pipe is arranged in an S-shaped spiral, and the air outlet end of the ventilation pipe is connected to the heat exchange device through the first connecting pipe.

[0008] Furthermore, the heat exchange device includes a heat exchange box, a first spiral water pipe, a second spiral water pipe and a cooling water tank, the cooling device is connected to the heat exchange box through a first connecting pipe, the heat exchange box is connected to the purification device through a second connecting pipe, the first spiral water pipe and the second spiral water pipe are staggered in the heat exchange box, the cooling water tank is arranged on the top of the heat exchange box, the first spiral water pipe and the second spiral water pipe are connected to the cooling water tank, and the ends of the first spiral water pipe and the second spiral water pipe away from the cooling water tank both pass through the side wall of the heat exchange box.

[0009] Furthermore, the purification device includes a purification box, a purification rack, a purification structure and a movable cleaning mechanism, the purification rack is arranged in the purification box, the purification structure is installed on the purification rack, the movable cleaning mechanism is arranged on the purification box, and the heat exchange device is connected to the purification box through a second connecting pipe.

[0010] Furthermore, the purification structure includes a first filter, a second filter, an absorption bag and a fixed structure, the fixed structure is fixedly connected to the purification frame, the fixed structure is detachably connected to the purification box, the first filter is arranged at one end of the purification frame close to the first connecting tube, the second filter is arranged at one end of the purification frame away from the first connecting tube, and the absorption bag is arranged between the first filter and the second filter and arranged in the fixed structure.

[0011] Furthermore, the fixed structure includes a plurality of limit blocks, positioning members and sealing plates, each limit block is respectively arranged at the upper and lower ends of the purification frame and each limit block is symmetrical to each other, the absorption bag is arranged between the limit blocks, the purification frame is fixedly connected to the sealing plate, a positioning hole is arranged on the sealing plate, and the positioning member is detachably connected to the purification box through the positioning hole.

[0012] Furthermore, the movable cleaning mechanism includes a rotating motor, a main rotating rod, a movable belt, a secondary rotating rod, a first cleaning component and a second cleaning component, the output end of the rotating motor is connected to the main rotating rod, the end of the main rotating rod away from the rotating motor is connected to the movable belt, the end of the movable belt away from the main rotating rod is connected to the secondary rotating rod, the main rotating rod is provided with a first gear, the first cleaning component is provided with a second gear, the first gear is meshed with the second gear, the secondary rotating rod is provided with a third gear, the second cleaning component is provided with a fourth gear, the third gear is meshed with the fourth gear, and the purification frame is provided between the first cleaning component and the second cleaning component.

[0013] Furthermore, the first cleaning assembly includes a first connecting rotating rod and a first cleaning brush, the first connecting rotating rod is detachably connected to the first cleaning brush, and the second gear is provided at one end of the first connecting rotating rod away from the first cleaning brush.

[0014] Furthermore, the first cleaning brush includes a connecting seat, a connecting part, a clamping part and a plurality of bristles, the connecting seat is provided with a connecting hole, the connecting part is detachably connected to the connecting hole, one end of the connecting part is fixedly connected to the clamping part, the clamping part is fixedly connected to each bristle, the connecting seat is provided with a mounting hole, the first connecting rotating rod is detachably connected to the mounting hole, and the inclination angle of each bristle to the lower end of the clamping part is 25°-30°.

[0015] Furthermore, the second cleaning assembly includes a second connecting rod and a second cleaning brush, the second connecting rod is detachably connected to the second cleaning brush, and the fourth gear is provided at one end of the second connecting rod away from the first cleaning brush.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the water electrolysis hydrogen production and waste heat utilization system of the present invention further cools the waste heat of oxygen through a cooling device, which helps to reduce the content of water vapor and other volatile impurities carried in the oxygen. Subsequently, through further processing by a heat exchange device, the heat energy in the oxygen can be recovered and used for other purposes, while further reducing the waste heat temperature of the oxygen. Finally, the oxygen is deeply purified by a purification device to remove possible impurities such as solid particles, harmful gases, and odors, to ensure that the oxygen discharged into the environment meets environmental protection standards and reduce the negative impact on air quality; the water electrolysis hydrogen production and waste heat utilization system of the present invention integrates a variety of processing units to achieve effective processing of the oxygen and its impurities generated by the electrolyzer, reduce environmental pollution, improve energy utilization efficiency, and promote sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention may be further understood from the following description in conjunction with the accompanying drawings, in which the components are not necessarily drawn to scale, but emphasis is placed on illustrating the principles of the embodiments, and in different views, the same reference numerals designate corresponding parts.

[0018] Figure 1 It is a schematic flow chart of the system for producing hydrogen by electrolysis of water and utilizing waste heat according to the present invention;

[0019] Figure 2 is a structural schematic diagram of the waste heat utilization unit of the present invention;

[0020] Figure 3 is a front cross-sectional view of the waste heat utilization unit of the present invention;

[0021] Figure 4 is a front cross-sectional view of the heat exchange device of the present invention;

[0022] Figure 5 is a front cross-sectional view of the purification device of the present invention;

[0023] Figure 6 is a top cross-sectional view of the purification device of the present invention;

[0024] Figure 7 is a side cross-sectional view of the purification device of the present invention;

[0025] Figure 8 is a schematic structural diagram of the first cleaning brush of the present invention;

[0026] Fig. 9 It is a structural schematic diagram of the connecting seat of the present invention;

[0027] Fig.10 It is a schematic diagram of the combined structure of the connecting part, the clamping part and the bristles of the present invention.

[0028] Description of reference numerals:

[0029] 1. Electrolyzer; 2. First gas-liquid separation device; 3. Circulation pump; 4. Cooling device; 41. Cooling box; 42. Ventilation pipe; 5. Heat exchange device; 51. Heat exchange box; 52. First spiral water pipe; 53. Second spiral water pipe; 54. Cooling water tank; 6. Purification device; 61. Purification box; 62. Purification rack; 63. Purification structure; 631. First filter screen; 632. Second filter screen; 633. Absorption bag; 634. Fixed structure; 6341. Limit block; 6342. Positioning member; 6343. Sealing plate; 64. Movable cleaning mechanism; 641. Rotating motor; 642. Main rotating rod; 643 , movable belt; 644, auxiliary rotating rod; 645, first cleaning component; 6451, first connecting rotating rod; 6452, first cleaning brush; 64521, connecting seat; 64522, connecting part; 64523, clamping part; 64524, bristles; 64525, connecting hole; 64526, mounting hole; 646, second cleaning component; 6461, second connecting rotating rod; 6462, second cleaning brush; 647, first gear; 648, second gear; 649, third gear; 640, fourth gear; 65, dust box; 7, first connecting pipe; 8, second connecting pipe; 9, second gas-liquid separation device. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the adsorption scope of the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0034] like Figure 1-Figure 10 As shown, a water electrolysis hydrogen production and waste heat utilization system in one embodiment of the present invention includes a water electrolysis hydrogen production unit and a waste heat utilization unit, the water electrolysis hydrogen production unit includes an electrolyzer 1, a first gas-liquid separation device 2, a second gas-liquid separation device 9 and a circulation pump 3, the electrolyzer 1 is provided with a hydrogen outlet and an oxygen outlet, the oxygen outlet is connected to the first gas-liquid separation device 2, the hydrogen outlet is connected to the second gas-liquid separation device 9, the first gas-liquid separation device 2 is provided with an oxygen outlet and a first liquid outlet, the second gas-liquid separation device 9 is provided with an oxygen outlet. A hydrogen outlet and a second liquid outlet are provided, the inlet of the circulating pump 3 is connected to the first liquid outlet and the second liquid outlet respectively, the outlet of the circulating pump 3 is connected to the electrolyzer 1, and the circulating pump 3 is used to recycle the electrolyte exchanged out of the heat into the electrolyzer 1; the waste heat utilization unit includes a cooling device 4, a heat exchange device 5 and a purification device 6, the cooling device 4 is connected to the oxygen outlet in the first gas-liquid separation device 2, the cooling device 4 is connected to the heat exchange device 5 through the first connecting pipe 7, and the heat exchange device 5 is connected to the purification device 6 through the second connecting pipe 8. Further waste heat cooling of oxygen by the cooling device 4 helps to reduce the content of water vapor and other volatile impurities carried in the oxygen. Subsequently, further processing by the heat exchange device 5 can recover the heat energy in the oxygen and use it for other purposes, while further reducing the waste heat temperature of the oxygen. Finally, the oxygen is deeply purified by the purification device 6 to remove possible impurities such as solid particles, harmful gases and odors, to ensure that the oxygen discharged into the environment meets environmental protection standards and reduces the negative impact on air quality. In this embodiment, the first liquid outlet and the second liquid outlet are respectively connected to the electrolyte heat exchange equipment, and after the separated electrolyte is heat exchanged, the heat exchanged electrolyte is recirculated and pumped into the electrolytic cell 1 through the circulation pump 3.

[0035] As a preferred embodiment of the present invention, it may also have the following additional technical features: the cooling device 4 includes a cooling box 41 and a vent pipe 42, the vent pipe 42 is arranged in the cooling box 41, the vent pipe 42 is arranged in an S-shaped spiral, and the outlet end of the vent pipe 42 is connected to the heat exchange device 5 through the first connecting pipe 7, which prolongs the movement time of the high-temperature gas in the vent pipe 42. When the high-temperature gas enters the vent pipe 42, due to the increase in the tortuosity and length of the pipeline, the flow speed of the high-temperature gas in the pipe will be relatively slowed down, thereby increasing the contact time and area with the vent pipe 42 and the air in the cooling box 41. During the contact process, the high-temperature gas will transfer heat to the vent pipe 42 and the surrounding air to achieve preliminary cooling. This cooling method is a combination of natural convection and radiation cooling, does not require additional energy consumption, and has a significant energy-saving effect. After the initial cooling, the temperature and heat of the high-temperature gas are effectively reduced, and then enters the first connecting pipe 7 through the outlet end of the vent pipe 42, and continues to flow to the purification device 6. In the purification device 6, the high-temperature gas is first further processed and purified to remove it, preparing for the subsequent waste heat recovery process.

[0036] As a preferred embodiment of the present invention, it may also have the following additional technical features: the heat exchange device 5 includes a heat exchange box 51, a first spiral water pipe 52, a second spiral water pipe 53 and a cooling water tank 54, the cooling device 4 is connected to the heat exchange box 51 through the first connecting pipe 7, the heat exchange box 51 is connected to the purification device 6 through the second connecting pipe 8, the cooling water tank 54 is arranged on the top of the heat exchange box 51, the first spiral water pipe 52 and the second spiral water pipe 53 are connected to the cooling water tank 54, and the ends of the first spiral water pipe 52 and the second spiral water pipe 53 away from the cooling water tank 54 both penetrate the side wall of the heat exchange box 51. The heat exchange box 51 provides a closed space, so that the first spiral water pipe 52 and the second spiral water pipe 53 can perform heat exchange in this space. The first spiral water pipe 52 and the second spiral water pipe 53 are the core components of the heat exchange device 5, which are staggered in the heat exchange box 51 to form a complex heat exchange network, which increases the area for high-temperature gas to perform heat exchange in different directions. The spiral design increases the length and surface area of ​​the water pipe, thereby improving the heat exchange efficiency. When the high-temperature gas contacts the first spiral water pipe 52 and the second spiral water pipe 53, its heat will be transferred to the water in the water pipe, and the water in the first spiral water pipe 52 and the second spiral water pipe 53 will be discharged after the heat is transferred, thereby heating the water to a certain temperature.

[0037] As a preferred embodiment of the present invention, it may also have the following additional technical features: the purification device 6 includes a purification box 61, a purification rack 62, a purification structure 63 and a movable cleaning mechanism 64, the purification rack 62 is arranged in the purification box 61, the purification structure 63 is installed on the purification rack 62, the movable cleaning mechanism 64 is arranged on the purification box 61, and the heat exchange device 5 is connected to the purification box 61 through the second connecting pipe 8. The purification box 61 is the main container of the purification process, which provides the necessary sealing and protection to ensure that the purification process is carried out in a safe and stable environment; the purification rack 62 is arranged in the purification box 61, which is used to support and fix the purification structure 63 to ensure the effectiveness and stability of the purification process; the purification structure 63 is used to remove impurities, particulate matter and odors in high-temperature gas; the movable cleaning mechanism 64 is used to clean the purification structure 63 to prevent blockage or reduce the purification efficiency.

[0038] As a preferred embodiment of the present invention, it may also have the following additional technical features: the purification structure 63 includes a first filter screen 631, a second filter screen 632, an absorption bag 633 and a fixed structure 634, the fixed structure 634 is fixedly connected to the purification frame 62, and the fixed structure 634 is detachably connected to the purification box 61. The first filter screen 631 is arranged at one end of the purification frame 62 close to the first connecting pipe 7. As a preliminary filtering layer, the first filter screen 631 can intercept larger particles and prevent them from entering the subsequent purification link, thereby reducing the burden of subsequent filtering components. The second filter screen 632 is arranged at one end of the purification frame 62 away from the first connecting pipe 7 to further remove tiny particles and suspended matter in the oxygen. The absorption bag 633 is arranged between the first filter 631 and the second filter 632 and in the fixed structure 634, and is used to absorb the electrolyte and water vapor contained in the oxygen and absorb the odor that may be generated. In this embodiment, the mesh diameter of the first filter 631 is larger than the mesh diameter of the second filter 632, and the outer end diameter of the purification frame 62 is equal to the inner end diameter of the purification box 61, which helps to ensure that the purification frame 62 is firmly installed in the purification box 61, while reducing the leakage and resistance of the gas during the flow process. Through the multiple filtering mechanisms of the first filter 631, the second filter 632 and the absorption bag 633, and the close cooperation between the purification frame 62 and the purification box 61, efficient purification of high-temperature gas is achieved.

[0039] As a preferred embodiment of the present invention, it may also have the following additional technical features: the fixed structure 634 includes a plurality of limit blocks 6341, a positioning member 6342 and a sealing plate 6343, each of the limit blocks 6341 is respectively arranged at the upper and lower ends of the purification rack 62 and each of the limit blocks 6341 is symmetrical to each other, and the absorption bag 633 is arranged between each of the limit blocks 6341 to ensure that the absorption bag 633 can be stably maintained inside the purification rack 62. At the same time, the space between the limit blocks 6341 provides an installation position for the absorption bag 633, so that the absorption bag 633 can achieve the best filtering effect, the purification rack 62 is fixedly connected to the sealing plate 6343, and a positioning hole is arranged on the sealing plate 6343. The positioning member 6342 passes through the positioning hole and is detachably connected to the purification box 61. When it is necessary to clean or replace the first filter 631, the absorption bag 633 and the second filter 632, it is only necessary to loosen the connection between the positioning member 6342 and the purification box 61.

[0040] As a preferred embodiment of the present invention, it may also have the following additional technical features: the movable cleaning mechanism 64 includes a rotating motor 641, a main rotating rod 642, a movable belt 643, a secondary rotating rod 644, a first cleaning component 645 and a second cleaning component 646, the output end of the rotating motor 641 is connected to the main rotating rod 642, the end of the main rotating rod 642 away from the rotating motor 641 is connected to the movable belt 643, the end of the movable belt 643 away from the main rotating rod 642 is connected to the secondary rotating rod 644, a first gear 647 is provided on the main rotating rod 642, a second gear 648 is provided on the first cleaning component 645, the first gear 647 is meshed with the second gear 648, and a third gear is provided on the secondary rotating rod 644. 649, a fourth gear 640 is provided on the second cleaning component 646, the third gear 649 is meshed with the fourth gear 640, the purification frame 62 is arranged between the first cleaning component 645 and the second cleaning component 646, when the rotating motor 641 is started, the main rotating rod 642 is driven to rotate, when the main rotating rod 642 rotates, through the gear transmission, the first cleaning component 645 starts to clean along the set trajectory, similarly, the main rotating rod 642 is connected to the auxiliary rotating rod 644 through the movable belt 643, forming a basic transmission system, so that the third gear 649 on the auxiliary rotating rod 644 is meshed with the fourth gear 640 on the second cleaning component 646, driving the second cleaning component 646 to clean. In this embodiment, the first filter 631 and the second filter 632 will gradually accumulate some tiny impurities, particulate matter and residues during long-term use. The first cleaning component 645 is used to clean the first filter 631, and the second cleaning component 646 is used to clean the second filter 632. Regular cleaning can remove these accumulations and keep the filters clean and unobstructed, thereby extending their service life. At the same time, a detachable dust box 65 is provided at the bottom of the purification box 61, and the dust box 65 is arranged below the first cleaning component 645 and the second cleaning component 646.

[0041] As a preferred embodiment of the present invention, it may also have the following additional technical features: the first cleaning assembly 645 includes a first connecting rod 6451 and a first cleaning brush 6452, the first connecting rod 6451 is detachably connected to the first cleaning brush 6452, and a second gear 648 is provided at one end of the first connecting rod 6451 away from the first cleaning brush 6452. Since the first cleaning brush 6452 is in direct contact with the purification rack 62 and cleans by rotating motion, it can effectively remove various impurities attached to the first filter 631. At the same time, due to the detachable connection design between the first connecting rod 6451 and the first cleaning brush 6452, the operator can adjust the position and angle of the cleaning brush as needed to achieve the best cleaning effect.

[0042] As a preferred embodiment of the present invention, it may also have the following additional technical features: the first cleaning brush 6452 includes a connecting seat 64521, a connecting portion 64522, a clamping portion 64523 and a plurality of bristles 64524, the connecting seat 64521 is provided with a connecting hole 64525, the connecting portion 64522 is detachably connected to the connecting hole 64525, one end of the connecting portion 64522 is fixedly connected to the clamping portion 64523, the clamping portion 64523 is fixedly connected to each bristle 64524, the connecting seat 64521 is provided with a mounting hole 64526, The first connecting rod 6451 is detachably connected to the mounting hole 64526, and the inclination angle between each bristle 64524 and the lower end of the clamping portion 64523 is 25°-30°. Within this angle range, it can ensure that the bristles 64524 can fully contact the surface of the purification frame 62 during rotation, and can also reduce the wear and tear of the bristles 64524 and the increase in energy consumption caused by excessively large angles. In this embodiment, the connecting seat 64521 is responsible for fixing the cleaning brush as a whole on the first connecting rod 6451, so that the cleaning brush can be easily removed when it needs to be replaced or cleaned. At the same time, a mounting hole 64526 is also provided on the connecting seat 64521, which is used for detachable connection with the first connecting rotating rod 6451, further enhancing the flexibility and maintainability of the cleaning brush. The connecting part 64522 ensures the stability of the cleaning brush during rotation. The clamping part 64523 is the key part for fixing each bristle 64524, and has a plurality of fine grooves for firmly fixing the bristles 64524 thereon. The bristles 64524 are the core part of the cleaning brush, which directly contacts the purification frame 62 and removes attached impurities.

[0043] As a preferred embodiment of the present invention, it may also have the following additional technical features: the second cleaning component 646 includes a second connecting rod 6461 and a second cleaning brush 6462, the second connecting rod 6461 and the second cleaning brush 6462 are detachably connected, and a fourth gear 640 is provided at one end of the second connecting rod 6461 away from the first cleaning brush 6452. In this embodiment, the second cleaning brush 6462 has the same structure as the first cleaning brush 6452, which will not be described in detail here. Since the second cleaning brush 6462 is in direct contact with the purification frame 62 and cleans by rotating motion, it can effectively remove various impurities attached to the second filter 632. At the same time, due to the detachable connection design between the second connecting rod 6461 and the second cleaning brush 6462, the operator can adjust the position and angle of the cleaning brush as needed to achieve the best cleaning effect.

[0044] Because the electrolytic cell 1 and its connecting pipes and other equipment materials may release some impurities under high temperature, high pressure or specific chemical environment, these impurities may be carried by oxygen, so there will be a large amount of impurities in the oxygen discharged from the external environment. The working principle of the water electrolysis hydrogen production and waste heat utilization system of this embodiment is as follows: First, oxygen enters the cooling device 4, and the cooling device 4 is provided with a cooling box 41 and a vent pipe 42. The vent pipe 42 is arranged in an S-shaped spiral in the cooling box 41 to increase the residence time and heat exchange area of ​​the oxygen in the cooling box 41; then the oxygen enters the heat exchange device 5, and when the oxygen passes through the heat exchange box 51, the remaining heat is absorbed by the cooling medium in the first spiral water pipe 52 and the second spiral water pipe 53, and the cooling medium then transfers the heat to the cold water in the cooling water tank 54 to achieve the transfer and recovery of the remaining heat. The cooled oxygen is discharged through the second connecting pipe 8, and the cooling medium that has absorbed the heat is discharged from the first spiral water pipe 52. And discharged from the water outlet of the second spiral water pipe 53 for subsequent use; then, the oxygen enters the purification device 6 and first passes through the first filter 631 to filter out larger particles, and then passes through the absorption bag 633 to further remove tiny particles, impurities and odors. The second filter 632 is used as a secondary filter to ensure the cleanliness of the oxygen flowing out of the purification box 61; the movable cleaning mechanism 64 is started regularly or on demand, and the main rotating rod 642 and the auxiliary rotating rod 644 are driven to rotate by the rotating motor 641, thereby driving the first cleaning component 645 and the second cleaning component 646 to move on the purification frame 62, cleaning impurities and particles attached to the first filter 631 and the second filter 632 to maintain the purification efficiency.

[0045] The water electrolysis hydrogen production and waste heat utilization system of the present embodiment has a reasonable structural design and is easy to use. This structure can also be used for other equipment with similar usage requirements. In the present embodiment, the water electrolysis hydrogen production and waste heat utilization system integrates a variety of processing units to achieve effective treatment of the oxygen and impurities generated by the electrolytic cell 1, reduce environmental pollution, improve energy utilization efficiency, and promote sustainable development.

[0046] In the description of the above embodiments, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, "several" and "multiple" mean more than one, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" and "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0047] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction between the combinations of these technical features, they should be considered to be within the scope recorded in this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A system for producing hydrogen by electrolysis of water and utilizing waste heat, characterized in that: include: A water electrolysis hydrogen production unit, the water electrolysis hydrogen production unit comprising an electrolyzer, a first gas-liquid separation device, a second gas-liquid separation device and a circulation pump, the electrolyzer is provided with a hydrogen outlet and an oxygen outlet, the oxygen outlet is connected to the first gas-liquid separation device, the hydrogen outlet is connected to the second gas-liquid separation device, the first gas-liquid separation device is provided with an oxygen outlet and a first liquid outlet, the second gas-liquid separation device is provided with a hydrogen outlet and a second liquid outlet, the inlet of the circulation pump is respectively connected to the first liquid outlet and the second liquid outlet, and the outlet of the circulation pump is connected to the electrolyzer; A waste heat utilization unit, the waste heat utilization unit includes a cooling device, a heat exchange device and a purification device, the cooling device is connected to the oxygen outlet end of the first gas-liquid separation device, the cooling device is connected to the heat exchange device through a first connecting pipe, and the heat exchange device is connected to the purification device through a second connecting pipe.

2. The water electrolysis hydrogen production and waste heat utilization system according to claim 1, characterized in that: The cooling device comprises a cooling box and a ventilation pipe, wherein the ventilation pipe is arranged in the cooling box, the ventilation pipe is arranged in an S-shaped spiral, and the air outlet end of the ventilation pipe is connected to the heat exchange device through the first connecting pipe.

3. The water electrolysis hydrogen production and waste heat utilization system according to claim 1, characterized in that: The heat exchange device includes a heat exchange box, a first spiral water pipe, a second spiral water pipe and a cooling water tank. The cooling device is connected to the heat exchange box through a first connecting pipe, and the heat exchange box is connected to the purification device through a second connecting pipe. The first spiral water pipe and the second spiral water pipe are staggered in the heat exchange box. The cooling water tank is arranged on the top of the heat exchange box. The first spiral water pipe and the second spiral water pipe are connected to the cooling water tank. The ends of the first spiral water pipe and the second spiral water pipe away from the cooling water tank both pass through the side wall of the heat exchange box.

4. The water electrolysis hydrogen production and waste heat utilization system according to claim 1, characterized in that: The purification device includes a purification box, a purification rack, a purification structure and a movable cleaning mechanism. The purification rack is arranged in the purification box, the purification structure is installed on the purification rack, the movable cleaning mechanism is arranged on the purification box, and the heat exchange device is connected to the purification box through a second connecting pipe.

5. The water electrolysis hydrogen production and waste heat utilization system according to claim 4, characterized in that: The purification structure includes a first filter, a second filter, an absorption bag and a fixed structure, wherein the fixed structure is fixedly connected to the purification frame, and the fixed structure is detachably connected to the purification box, the first filter is arranged at one end of the purification frame close to the first connecting tube, the second filter is arranged at one end of the purification frame away from the first connecting tube, and the absorption bag is arranged between the first filter and the second filter and in the fixed structure.

6. The water electrolysis hydrogen production and waste heat utilization system according to claim 5, characterized in that: The fixing structure includes a plurality of limit blocks, a positioning rod and a positioning cover, wherein the limit blocks are respectively arranged at the upper and lower ends of the purification frame and are symmetrical to each other, the absorption bag is arranged between the limit blocks, the purification frame is fixedly connected to the positioning cover, a positioning hole is arranged on the positioning cover, and the positioning rod passes through the positioning hole and is detachably connected to the purification box.

7. The water electrolysis hydrogen production and waste heat utilization system according to claim 4, characterized in that: The movable cleaning mechanism includes a rotating motor, a main rotating rod, a movable belt, a secondary rotating rod, a first cleaning component and a second cleaning component. The output end of the rotating motor is connected to the main rotating rod, the end of the main rotating rod away from the rotating motor is connected to the movable belt, the end of the movable belt away from the main rotating rod is connected to the secondary rotating rod, the main rotating rod is provided with a first gear, the first cleaning component is provided with a second gear, the first gear is meshed with the second gear, the secondary rotating rod is provided with a third gear, the second cleaning component is provided with a fourth gear, the third gear is meshed with the fourth gear, and the purification frame is provided between the first cleaning component and the second cleaning component.

8. The water electrolysis hydrogen production and waste heat utilization system according to claim 7, characterized in that: The first cleaning assembly includes a first connecting rotating rod and a first cleaning brush. The first connecting rotating rod is detachably connected to the first cleaning brush. The second gear is disposed at one end of the first connecting rotating rod away from the first cleaning brush.

9. The water electrolysis hydrogen production and waste heat utilization system according to claim 8, characterized in that: The first cleaning brush includes a connecting seat, a connecting part, a clamping part and a plurality of bristles. The connecting seat is provided with a connecting hole. The connecting part is detachably connected to the connecting hole. One end of the connecting part is fixedly connected to the clamping part. The clamping part is fixedly connected to each bristle. The connecting seat is provided with a mounting hole. The first connecting rotating rod is detachably connected to the mounting hole. The inclination angle of each bristle to the lower end of the clamping part is 25°-30°.

10. The water electrolysis hydrogen production and waste heat utilization system according to claim 7, characterized in that: The second cleaning assembly includes a second connecting rod and a second cleaning brush, the second connecting rod is detachably connected to the second cleaning brush, and the fourth gear is disposed at one end of the second connecting rod away from the first cleaning brush.

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