Hydrogen production system based on aluminum-water reaction

Abstract

The utility model relates to a hydrogen production system based on aluminum-water reaction. Comprising a reaction assembly, a feeding assembly and a circulating assembly. The reaction assembly comprises a main reaction kettle and a secondary reactor; a discharge hole of the main reaction kettle is communicated with the secondary reactor through a discharge valve and a first sewage pump in sequence; a heat exchange tube is arranged in the main reaction kettle; and the secondary reactor is used for outputting a hydrogen product. The feeding assembly comprises an inert gas source and an aluminum-containing raw material. The feeding assembly is communicated to a feeding hole of the main reaction kettle through a first feeding channel. The circulating assembly comprises a water tank filled with circulating water, and the circulating water is configured to be capable of adjusting the temperature; the water tank is communicated to a feeding hole of the main reaction kettle through a second feeding channel; the water tank further communicates with two ends of the heat exchange tube. The double reaction kettles are arranged for cooperative operation, so that raw materials react more fully, and stable hydrogen flow supply is realized; the reaction rate is controlled through temperature, safety and reliability are achieved, and the energy utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production, in particular to a hydrogen production system based on aluminum-water reaction. Background Art

[0002] As a new type of clean energy, hydrogen plays a vital role in the decarbonization of the transportation sector. As the infrastructure for the construction of a hydrogen transportation network, hydrogen refueling stations are experiencing a growing demand. Existing hydrogen refueling stations often provide off-site hydrogen supply, relying on long-tube trailers for transportation. This poses safety risks, long loading and unloading times, and high operating costs. While integrated hydrogen refueling stations employing "distributed hydrogen production" and "on-site refueling equipment" to achieve integrated hydrogen production and refueling can address hydrogen storage and transportation issues and stabilize hydrogen costs, they require a stable hydrogen supply.

[0003] Currently, hydrogen production technologies include a variety of routes, including fossil fuel hydrogen production, industrial by-product hydrogen production, and renewable energy hydrogen production. Both fossil fuel hydrogen production and industrial by-product hydrogen production are associated with high carbon emissions, environmental pollution, and limited raw materials. Among renewable energy sources, hydrogen production from water electrolysis, methanol reforming, and ammonia decomposition often suffers from low efficiency and high production costs.

[0004] In recent years, the technology of hydrogen production from metallic aluminum has been developing continuously. Due to the advantages of aluminum element such as high content, wide source and low price, the industrial aluminum-based alloy controllable hydrogen technology has broad market prospects. However, the current hydrogen production from aluminum-water reaction still has problems such as insufficient reaction and difficult to control reaction rate. Utility Model Content

[0005] To this end, the technical problem to be solved by the present invention is to overcome the technical difficulties in the existing technology that the hydrogen production reaction of aluminum-water reaction is insufficient and the reaction rate is difficult to control, and to provide a hydrogen production system based on aluminum-water reaction, which can not only realize automatic and continuous hydrogen production to adapt to the needs of integrated hydrogen refueling stations, but also control the aluminum-water reaction rate to make the reaction sufficient and complete.

[0006] In order to solve the above technical problems, the utility model provides a hydrogen production system based on aluminum-water reaction, which includes:

[0007] A reaction assembly comprising a main reactor and a secondary reactor; the discharge port of the main reactor is connected to the secondary reactor via a discharge valve and a first sewage pump in sequence; a heat exchange tube is provided inside the main reactor; and the secondary reactor is used to output hydrogen products;

[0008] A feeding assembly, comprising an inert gas source and an aluminum-containing raw material; the feeding assembly is connected to the feed port of the main reactor through a first feeding channel;

[0009] A circulation component includes a water tank filled with circulating water, and the circulating water is configured to be able to adjust the temperature; the water tank is connected to the feed port of the main reactor through a second feeding channel; the water tank is also connected to both ends of the heat exchange tube, and a cooling pump is provided between the water tank and the heat exchange tube.

[0010] In one embodiment of the present invention, the secondary reactor includes a secondary reactor;

[0011] The feed port of the secondary reactor is connected to the discharge port of the main reactor;

[0012] The hydrogen production system also includes a slag discharge component, which includes a centrifuge and a sedimentation tank; the discharge port of the secondary reactor is connected to the inlet end of the centrifuge through a slag discharge valve and a second sewage pump in sequence, and the sedimentation tank is connected to the outlet end of the centrifuge.

[0013] In one embodiment of the present invention, the secondary reactor includes a plurality of sub-reactors;

[0014] The plurality of auxiliary reaction kettles are arranged in sequence, and adjacent auxiliary reaction kettles are connected to each other;

[0015] The hydrogen production system also includes a slag discharge component, which includes a centrifuge and a sedimentation tank; the discharge port of at least one of the secondary reactors in the secondary reactor is connected to the inlet end of the centrifuge through a slag discharge valve and a second sewage pump in sequence, and the sedimentation tank is connected to the outlet end of the centrifuge.

[0016] In one embodiment of the present invention, a return water pipe is further included, one end of the return water pipe is connected to the top of the sedimentation tank through a water pump, and the other end of the return water pipe is connected to the water tank.

[0017] In one embodiment of the present invention, the first feeding channel is provided with a feeding solenoid valve; a return air channel and a backflush channel are also provided between the feeding assembly and the main reactor, the return air channel is provided with a return air solenoid valve, and the backflush channel is provided with a backflush solenoid valve.

[0018] In one embodiment of the present invention, a purification component is further included; the purification component includes a demister and a buffer tank, one end of the demister is connected to the top of the main reactor and the top of the secondary reactor, and the other end of the demister is connected to the buffer tank.

[0019] In one embodiment of the present invention, the buffer tank is configured as a columnar structure, and the pipe of the demister for connecting the buffer tank abuts against the inner wall of the buffer tank and is tangent to the cross section of the buffer tank.

[0020] In one embodiment of the present invention, the main reactor and the secondary reactor of the secondary reactor both include a reactor body and a reaction cylinder. The reaction cylinder is arranged in the reactor body and is detachably connected to the reactor body. The material of the reaction cylinder is set to aluminum.

[0021] In one embodiment of the present invention, a reaction zone and the heat exchange tube are arranged inside the reaction cylinder of the main reactor; the heat exchange tube is arranged around the reaction zone; and mounting holes for fixing the heat exchange tube are provided on both the reaction cylinder and the reactor body.

[0022] In one embodiment of the present invention, the water tank is connected to an external water supply source; the circulation component further includes a refrigerator, and the refrigerator is connected to the water tank via a refrigeration pump.

[0023] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0024] The hydrogen production system based on aluminum-water reaction described in the utility model is provided with a main reactor and a secondary reactor, and a two-stage reaction space is provided in total for coordinated operation, which can not only make the raw materials react more fully and improve the utilization rate of aluminum-containing raw materials, but also avoid the single reactor being occupied for a long time, which affects the hydrogen production efficiency; it enables hydrogen to be continuously produced, realizes a stable hydrogen flow supply, and makes the reaction process more efficient.

[0025] The hydrogen production system based on aluminum-water reaction described in the utility model can control the feeding amount of raw materials and control the reaction rate by temperature, thereby avoiding excessive pressure in the kettle caused by too fast a reaction rate, reducing safety hazards, and having higher safety and reliability; in addition, the hydrogen production system can reasonably recycle the reaction raw materials and perform post-processing, is environmentally friendly, and has high energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the content of the utility model easier to understand, the utility model is further described in detail below based on the specific embodiments of the utility model in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 This is a schematic diagram of a hydrogen production system based on aluminum-water reaction in a preferred embodiment of the present invention;

[0028] Figure 2 This is a partially enlarged structural diagram of the main reactor in a preferred embodiment of the present utility model;

[0029] Figure 3 This is a schematic diagram of the structure in which the pipeline and the buffer tank abut against each other in a preferred embodiment of the present utility model;

[0030] Figure 4 This is a schematic diagram of the process flow of a hydrogen production system based on aluminum-water reaction in a preferred embodiment of the present utility model.

[0031] Explanation of the reference numerals in the accompanying drawings in the specification: 11. Main reactor; 1101. Reactor body; 1102. Reaction cylinder; 1103. Heat exchange tube; 12. Auxiliary reactor; 13. Discharge valve; 14. First sewage pump; 21. Silo; 22. Feed solenoid valve; 23. Return air solenoid valve; 24. Backflush solenoid valve; 31. Water tank; 32. Cooling pump; 33. Freezer; 34. Refrigeration pump; 35. Water supply pump; 36. Water supply solenoid valve; 37. Automatic valve; 38. Manual valve; 41. Centrifuge; 42. Slag discharge valve; 43. Second sewage pump; 44. Sedimentation tank; 51. Suction pump; 52. Return water pipe; 61. Defoamer; 62. Buffer tank. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0033] Reference Figures 1 to 4 As shown, the utility model provides a hydrogen production system based on the aluminum-liquid reaction, including a reaction component, a feeding component, a circulation component, a purification component, a slag removal component, and a detection component. The feeding component controls the feeding speed, the reaction component and the circulation component are used to control the reaction speed and ensure the reaction proceeds fully, and the purification component and the slag removal component are used to improve the hydrogen purity and post-process by-products, so that hydrogen production can be carried out continuously.

[0034] The reaction of aluminum with water to produce hydrogen can be used as an effective means of hydrogen storage, with a hydrogen storage capacity of up to 11.1% (mass fraction). This makes it both a good hydrogen carrier and an ideal hydrogen storage medium for proton exchange membrane fuel cells. The inventors of this case have discovered that some existing continuous hydrogen production equipment uses non-woven fabrics to wrap the material, resulting in incomplete reactions, waste of raw materials, and high costs. Other equipment lacks slag removal, resulting in short continuous hydrogen production times and low output, making it difficult to promote and implement.

[0035] The hydrogen production system disclosed in the utility model can control the rate and reaction degree of hydrogen production from aluminum-water reaction, is more suitable for the needs of integrated hydrogen production and hydrogenation stations, and is easy to promote and use on a large scale; it also includes product post-processing and water circulation, and has a high degree of automation.

[0036] Specifically, refer to Figure 1As shown, the reaction assembly includes a main reactor 11 and a secondary reactor. The discharge port of the main reactor 11 is connected to the secondary reactor via a discharge valve 13 and a first sewage pump 14. This utility model has a two-stage reaction space. The main reactor 11 is used to load the raw materials for the aluminum-liquid reaction and rapidly produce hydrogen within the main reactor 11. The secondary reactor is used to perform a secondary reaction on the aluminum powder that has not fully reacted in the main reactor 11, shortening the overall reaction time and solving the problem of insufficient primary reaction.

[0037] In some embodiments, reference Figure 1 As shown, the secondary reactor includes a secondary reactor 12. The discharge port of the main reactor 11 is connected to the feed port of the secondary reactor 12 through a discharge valve 13 and a first sewage pump 14. The secondary reaction is carried out in the secondary reactor 12.

[0038] In some embodiments, the secondary reactor includes a plurality of sub-reactors; the plurality of sub-reactors are arranged in sequence, and adjacent sub-reactors are interconnected.

[0039] The feed port of one of the secondary reactors is communicated with the discharge port of the secondary reactor adjacent to one side; and the discharge port is communicated with the feed port of the secondary reactor adjacent to the other side.

[0040] The feed port of the secondary reactor at one end of the secondary reactor is used to receive unreacted aluminum powder from the main reactor 11. Multiple reactions are then performed sequentially in multiple secondary reactors, significantly improving raw material utilization, hydrogen production rate, and total hydrogen production. The number of secondary reactors in the secondary reactor can be two, three, four, or more.

[0041] Furthermore, the main reactor 11 and the auxiliary reactor 12 each include a reactor body 1101 and a reaction cylinder 1102. The reaction cylinder 1102 is arranged on the inner wall of the reactor body 1101 and is detachably connected to the reactor body 1101.

[0042] The reaction cylinder 1102 is made of aluminum-based material. Preferably, the reaction cylinder 1102 is made of pure aluminum. The reaction cylinder 1102 serves as an aluminum-based lining in the kettle 1101, thereby preventing carbon from precipitating from the stainless steel kettle 1101 and affecting the purity of hydrogen.

[0043] One end of the reaction cylinder 1102 is set as a closed end, and the other end is set as an open end. In some embodiments, the reaction cylinder 1102 is welded and fixed to the kettle body 1101. In some embodiments, the open end of the reaction cylinder 1102 is fixed to the kettle body 1101 through a flange.

[0044] After repeated use, when the aluminum-based reaction cylinder 1102 is worn out, it can be disassembled and replaced through the detachable connection between the reaction cylinder 1102 and the kettle body 1101, avoiding the overall replacement and maintenance of the reactor, reducing maintenance costs and improving production efficiency.

[0045] Further, refer to Figure 2 As shown, heat exchange tubes 1103 are installed within the reaction cylinder 1102 of the main reactor 11, which also includes a reaction zone. The heat exchange tubes 1103 are arranged around the reaction cylinder to form a hollow cylindrical shape. The interior of the cylindrical shape serves as the reaction zone, the primary location for the reaction between the aluminum-containing raw material and water. Although some aluminum-containing raw material may accumulate in the gaps between the heat exchange tubes 1103, since the reactants include liquid, the aluminum-containing raw material does not become excessively clogged and remains in continuous contact with the water participating in the reaction.

[0046] The heat exchange tube 1103 is in full contact with the reactants in the reaction cylinder 1102 , and circulating water with a relatively low temperature flows in the heat exchange tube 1103 to control the temperature of the reaction zone.

[0047] Since the continuous reaction of molten aluminum will release a large amount of heat, and the accuracy of temperature control directly affects the hydrogen production rate and reaction stability, the heat exchange tube 1103 is used to control the internal temperature of the main reactor to avoid excessive heat release caused by the violent reaction and cause safety accidents, while also preventing the temperature from being too low and affecting the hydrogen production efficiency.

[0048] Both ends of the heat exchange tube 1103 are connected to external circulation assemblies for water circulation. In some embodiments, the main reactor body 1101 and the reaction cylinder 1102 are both provided with mounting holes for securing the heat exchange tube 1103. The heat exchange tube 1103 is welded to these mounting holes. Disassembly of the reaction cylinder 1102 requires cutting the heat exchange tube 1103. In some embodiments, the ends of the main reactor body 1101 and the reaction cylinder 1102 are both provided with grooves for securing the heat exchange tube 1103, overcoming the inconvenience of assembly and disassembly associated with welding.

[0049] Specifically, the loading assembly includes a silo 21 , which contains an inert gas source and aluminum-containing raw materials.

[0050] Preferably, the inert gas source is a nitrogen source, which outputs nitrogen as positive pressure to push the aluminum powder raw material into the main reactor 11 to achieve uniform loading. In other embodiments, the inert gas source can also be set to other gas sources that meet the use requirements.

[0051] The aluminum-containing raw material is preferably a composite alloy of ordinary aluminum powder and additives. This is due to its abundant, affordable, and readily available resources, facilitating large-scale application. Furthermore, the aluminum powder and additives can be effectively separated after reacting with molten aluminum, allowing the low-melting-point metal in the additives to be recycled. Since most additives are water-soluble, hydrogen production using this "combination of additive and water" process is both easier and safer.

[0052] The feeding assembly is connected to the feeding port of the main reactor 11 through the first feeding channel. The first feeding channel is also provided with a feeding solenoid valve 22 for controlling the on and off of aluminum powder feeding.

[0053] Furthermore, a return air channel and a backflush channel are provided between the feeding assembly and the feeding port of the main reactor 11; wherein, the return air channel is controlled on and off by a return air solenoid valve 23, and the return air channel is used to return nitrogen to the nitrogen gas source; the backflush channel is controlled on and off by a backflush solenoid valve 24, and the backflush channel is used to backflush the pipe wall of the first feeding channel to prevent the raw materials from becoming compacted or sticky.

[0054] Specifically, refer to Figure 1 As shown, the circulation component includes a water tank 31 filled with circulating water. The water tank 31 is connected to an external water supply source to replenish the internal circulating water in a timely manner. When the aluminum-water reaction consumes some water, the water supply source supplies water to enable the reaction to proceed in a continuous cycle.

[0055] In some embodiments, the water tank 31 is connected to an external tap water interface as a water supply source, and an automatic valve 37 and a manual valve 38 are provided in parallel between the water tank 31 and the tap water interface, so that the control of the water tank 31 is more reliable and the water storage is more flexible.

[0056] The circulating water in the water tank 31 acts as a raw material in the aluminum-liquid reaction. The water tank 31 is connected to the feed port of the main reactor 11 via a second feeding channel, where it reacts with the aluminum powder fed through the first feeding channel. The second feeding channel is equipped with a water supply pump 35 to control water pumping, and a water supply solenoid valve 36 and a shutoff valve to control on / off.

[0057] The circulating water in the water tank 31 is used as cooling water for the heat exchange tube 1103 in the main reactor 11. The water tank 31 is connected to both ends of the heat exchange tube 1103. A cooling pump 32 is provided between the water tank 31 and the heat exchange tube 1103 to extract the circulating water at a lower temperature as cooling water.

[0058] It should be noted that the reaction heat effect in the hydrogen production system disclosed in the present invention is large. In some embodiments, the heat generated by the reaction can also participate in cogeneration of heat and power. Compared with the large amount of electricity consumed by electrolysis of water to produce hydrogen, the energy utilization rate of the aluminum-water reaction is higher.

[0059] Furthermore, the circulation assembly includes a refrigerator 33, which is connected to the interior of the water tank 31 via a refrigeration pump 34. The water in the water tank 31 is configured to be temperature-regulated by the refrigerator 33. When the temperature of the main reactor 11 is too high, the circulating water flows through the heat exchange tube 1103 to absorb the reaction heat within the main reactor 11. After absorbing the heat, the temperature rises and the water flows back into the water tank 31. At this time, the refrigerator 33 and refrigeration pump 34 can control the temperature of the circulating water in the water tank 31, allowing heat exchange in the heat exchange tube 1103 to continue.

[0060] Specifically, refer to Figure 1 As shown, the purification assembly includes a demister 61, one end of which is connected to the main reactor 11 and the secondary reactor. The hydrogen products produced by the primary reaction in the main reactor 11 and the secondary reaction in the secondary reactor will rise to the top due to their low density. Therefore, the demister 61 is connected to the top of the main reactor 11 and the top of the secondary reactor to collect the gas products and remove moisture and some powdery particles in the hydrogen.

[0061] It should be noted that when the secondary reactor includes one or more auxiliary reactors 12, since each auxiliary reactor 12 reacts to produce hydrogen products, the top of each auxiliary reactor 12 is connected to the purification component for outputting gas.

[0062] Specifically, the purification assembly further includes a buffer tank 62, and the other end of the demister 61 is connected to the buffer tank 62. Figure 2 As shown, the buffer tank 62 is configured as a columnar structure, and the pipe of the demister 61 used to connect the buffer tank 62 abuts against the inner wall of the buffer tank 62 and is tangent to the cross section of the buffer tank 62 .

[0063] The hydrogen purified by the demister 61 enters the buffer tank 62. Since the pipeline abuts against the inner wall of the buffer tank 62, the hydrogen airflow will spiral upward along the wall in the buffer tank 62. The tiny particles entrained in the rising process of the airflow will fall to the bottom of the buffer tank 62, and the hydrogen product will be further purified by the airflow route setting.

[0064] It should be noted that, in order to better separate the tiny particles in the airflow and allow them to fall along the wall, it is preferred that the pipe be tangent to the cross-section of the buffer tank 62 to achieve a better purification effect. However, in some embodiments, to reduce the difficulty of processing and control processing costs, the pipe used by the demister 61 to connect to the buffer tank 62 can also be set to abut the inner wall of the buffer tank 62, and the length of the pipe inside the buffer tank can be as short as possible, so that the separation and purification effect is as close to a tangent setting as possible.

[0065] Specifically, refer to Figure 1As shown, the slag discharge assembly is used to discharge and recycle the by-product aluminum hydroxide produced by the reaction. The reactants in the main reactor 11 are transferred to the secondary reactor, so the slag discharge assembly is connected to the secondary reactor for by-product treatment.

[0066] It should be noted that when the secondary reactor includes a secondary reactor 12, Figure 1 As shown, the discharge port of the secondary reactor 12 is connected to the slag discharge assembly.

[0067] When a secondary reactor includes multiple secondary reactors, the discharge port of each secondary reactor can be connected to an adjacent secondary reactor to transfer excess reaction materials, or it can be connected to a slag discharge assembly to discharge waste residue. The discharge port of at least one secondary reactor in the secondary reactor must be connected to a slag discharge assembly.

[0068] The specific number and position of the connection between the auxiliary reactor and the slag discharge component can be set according to the actual demand for hydrogen production, and then according to the reaction process and slag discharge requirements, without limitation thereto.

[0069] Next, the slag discharge assembly includes a centrifuge 41. The discharge port of at least one secondary reactor in the secondary reactor is connected to the inlet of the centrifuge 41. A second sewage pump 43 is provided for extracting waste, and a slag discharge solenoid valve is provided for on-off control. Centrifuge 41 separates slag from liquid through centrifugal operation. Solid waste can be directly centrifuged by the centrifuge 41 and separated at the outlet, where it is processed to produce high-purity aluminum hydroxide.

[0070] The slag discharge assembly also includes a sedimentation tank 44, which is connected to the outlet of the centrifuge 41 and is used to further sediment the wastewater and separate the solid particles. The chemical equation of the aluminum-water reaction is as follows:

[0071] 2Al+6H2O→2Al(OH)3+3H2

[0072] The hydrogen produced by the reaction is collected by the purification component, and the remaining substances are unreacted aluminum powder, aluminum hydroxide and water. Therefore, the supernatant after further sedimentation in the sedimentation tank 44 is pure water, which can participate in the next aluminum-water reaction to produce hydrogen.

[0073] In order to make the remaining water of the reaction be recycled, refer to Figure 1 As shown, the hydrogen production system disclosed in the present invention also includes a return water pipe 52, one end of the return water pipe 52 is connected to the top of the sedimentation tank 44 through a water pump 51 for extracting the supernatant liquid, and the other end of the return water pipe 52 is connected to the water tank 31 to use the remaining pure water from the reaction as a supplement to the circulating water, thereby realizing the secondary recycling of the reaction water.

[0074] Specifically, the hydrogen production system also includes a detection assembly (not shown), which is configured as an integrated control cabinet to instantly monitor and control the operation of the loading assembly, reaction assembly, and other components. The detection assembly includes various electronic controllers, sensor interfaces, displays, and alarm devices.

[0075] The detection component includes at least a temperature sensor and a pressure sensor; the display screen of the detection component is used to display the real-time temperature, pressure, liquid flow and hydrogen purity parameters in the main reactor 11 and the auxiliary reactor 12 and save historical data records.

[0076] The control end of the detection component is connected to at least the loading component and the reaction component. It is used to automatically adjust the operating parameters of each component and the opening and closing of each valve according to the set process flow, ensuring the stability and efficiency of the aluminum-liquid reaction. Of course, the valves and operating parameters in the hydrogen production system can also be manually intervened and adjusted through the detection component.

[0077] Based on the detection of operating data such as temperature and pressure, the detection component can also provide prompts and warnings in situations such as over-temperature, over-pressure or abnormal flow, and set up an emergency stop device that can be manually controlled to protect the safety of equipment operation and the operating environment.

[0078] In some embodiments, the main reactor 11 and the auxiliary reactor 12 are also provided with pressure gauges; the two groups of reactors are also provided with mechanical pressure relief components to prevent the reactor body from cracking and exploding when overpressure occurs, which is safe and reliable.

[0079] The working principle of the hydrogen production system based on aluminum-water reaction disclosed in this utility model is as follows:

[0080] Reference Figure 3 As shown, the working process of the hydrogen production system includes hydrogen preparation, slag liquid treatment and water circulation, and hydrogen collection and purification are performed simultaneously.

[0081] Hydrogen production

[0082] The aluminum-containing raw materials required for the reaction are placed into the loading assembly. The detection assembly sets the raw material dosage ratio and simultaneously controls the opening of the water supply solenoid valve 36. The water supply pump 35 operates, pumping a fixed amount of circulating water from the water tank 31 into the main reactor 11. Once the pure water is fully injected, the water supply pump 35 and water supply solenoid valve 36 automatically close, severing the connection between the main reactor 11 and the water tank 31.

[0083] The feeding solenoid valve 22 automatically opens, the return air solenoid valve 23 opens, and the back-blowing solenoid valve 24 closes; the nitrogen-coated aluminum powder enters the silo 21. Thereafter, the feeding solenoid valve 22 closes, and the positive-pressure nitrogen used for feeding returns to the nitrogen source through the return air channel, and then the return air solenoid valve 23 closes.

[0084] Aluminum powder and water react inside the main reactor 11 to produce hydrogen and aluminum hydroxide, and at the same time generate a large amount of reaction heat.

[0085] The temperature sensor detects the temperature inside the main reactor 11. When the temperature inside the reactor reaches the upper limit of the preset temperature range, the cooling pump 32 is activated. Cooler circulating water is pumped into the heat exchange tube 1103 as cooling water. As the cooling water flows through the spirally curved heat exchange tube 1103, it quickly removes the heat generated in the reactor, lowering the temperature inside the main reactor 11.

[0086] When the temperature in the reactor reaches the lower limit of the preset temperature range, the cooling pump 32 stops pumping. By controlling the temperature of the main reactor 11, the hydrogen production rate in the reactor is kept within a suitable controllable range, avoiding a low reaction rate that prolongs the reaction time and increases the production cost, and also avoiding safety accidents caused by excessively high temperature and excessive hydrogen production rate.

[0087] After the aluminum liquid in the main reactor 11 reacts for a period of time and the hydrogen production rate slows down, the first sewage pump 14 is turned on to transfer the slurry in the main reactor 11 to the secondary reactor for further reaction, and the main reactor 11 is emptied.

[0088] During hydrogen production in main reactor 11, a purification assembly is always connected to collect and purify the hydrogen that rises to the upper layer. Once the slurry in main reactor 11 has been completely transferred, the hydrogen collection pipe in main reactor 11 is closed. The backflush solenoid valve 24 is opened to backflush the walls of the first feed channel to prevent raw material from caking. The return air solenoid valve 23 is then opened to recover nitrogen.

[0089] The slurry continues to react in the secondary reactor while being defoamed and purified by the purification component and collected in a buffer.

[0090] After the loading, reaction preparation, collection, slurry transfer, and backflushing processes in the main reactor 11 are completed, the loading can be repeated again to continuously produce hydrogen.

[0091] Slag and liquid treatment

[0092] After the slurry in the secondary reactor has reacted completely, the discharge valve 42 and the second sewage pump 43 are opened to transfer the slurry to the centrifuge 41. When the pressure in the secondary reactor 12 drops below the set value, the discharge valve 42 and the second sewage pump 43 are closed. The centrifuge 41 centrifuges the aluminum hydroxide slurry that cannot participate in the reaction, removes the solid waste, and the sewage enters the sedimentation tank for sedimentation.

[0093] water cycle

[0094] First, the water circulation includes the cooling water entering the heat exchange tube 1103 and circulating between the main reactor 11 and the water tank 31, and being cooled and temperature-controlled by the refrigerator 33 in the water tank 31.

[0095] Secondly, the circulating water from the water tank 31 enters the main reactor 11 through the second feeding channel and participates in the reaction. After the reaction, it is transferred to the secondary reactor along with the solids. After the slag liquid is treated and settled in the sedimentation tank, it returns to the water tank 31 through the return pipe 52 to participate in the next reaction. The circulating water consumed by the aluminum-liquid reaction is replenished from the water supply source.

[0096] The hydrogen production system disclosed in this utility model sequentially produces hydrogen, discharges slag, and circulates water, all while performing purification, based on a detection component, achieving automated, continuous hydrogen production. When used in an integrated hydrogen production and refueling station, the hydrogen production system eliminates the costs of compressing, storing, and transporting hydrogen, completely resolving the challenges of long-distance transportation and high costs associated with green hydrogen.

[0097] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0098] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0099] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0100] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0101] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0102] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may be subject to various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. The above embodiments are merely examples for clear explanation and are not limitations on the implementation methods. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present utility model.

Claims

1. A hydrogen production system based on aluminum-water reaction, characterized in that: include, A reaction assembly comprising a main reactor and a secondary reactor; the discharge port of the main reactor is connected to the secondary reactor via a discharge valve and a first sewage pump in sequence; a heat exchange tube is provided inside the main reactor; and the secondary reactor is used to output hydrogen products; A feeding assembly, comprising an inert gas source and an aluminum-containing raw material; the feeding assembly is connected to the feed port of the main reactor through a first feeding channel; A circulation component includes a water tank filled with circulating water, and the circulating water is configured to be able to adjust the temperature; the water tank is connected to the feed port of the main reactor through a second feeding channel; the water tank is also connected to both ends of the heat exchange tube, and a cooling pump is provided between the water tank and the heat exchange tube.

2. The hydrogen production system based on aluminum-water reaction according to claim 1 is characterized in that: The secondary reactor includes a secondary reactor; The feed port of the secondary reactor is connected to the discharge port of the main reactor; The hydrogen production system also includes a slag discharge component, which includes a centrifuge and a sedimentation tank; the discharge port of the secondary reactor is connected to the inlet end of the centrifuge through a slag discharge valve and a second sewage pump in sequence, and the sedimentation tank is connected to the outlet end of the centrifuge.

3. The hydrogen production system based on aluminum-water reaction according to claim 1, characterized in that: The secondary reactor includes a plurality of sub-reactors; The plurality of auxiliary reaction kettles are arranged in sequence, and adjacent auxiliary reaction kettles are connected to each other; The hydrogen production system also includes a slag discharge component, which includes a centrifuge and a sedimentation tank; the discharge port of at least one of the secondary reactors in the secondary reactor is connected to the inlet end of the centrifuge through a slag discharge valve and a second sewage pump in sequence, and the sedimentation tank is connected to the outlet end of the centrifuge.

4. The hydrogen production system based on aluminum-water reaction according to claim 2 or 3, characterized in that: It also includes a return water pipe, one end of which is connected to the top of the sedimentation tank through a water pump, and the other end of the return water pipe is connected to the water tank.

5. The hydrogen production system based on aluminum-water reaction according to claim 1, characterized in that: The first feeding channel is provided with a feeding solenoid valve; a return air channel and a backflush channel are also provided between the feeding assembly and the main reactor, the return air channel is provided with a return air solenoid valve, and the backflush channel is provided with a backflush solenoid valve.

6. The hydrogen production system based on aluminum-water reaction according to claim 1, characterized in that: It also includes a purification component; the purification component includes a demister and a buffer tank, one end of the demister is connected to the top of the main reactor and the top of the secondary reactor, and the other end of the demister is connected to the buffer tank.

7. The hydrogen production system based on aluminum-water reaction according to claim 6, characterized in that: The buffer tank is configured as a columnar structure, and the pipe of the demister for connecting the buffer tank abuts against the inner wall of the buffer tank and is tangent to the cross section of the buffer tank.

8. The hydrogen production system based on aluminum-water reaction according to claim 1, characterized in that: The main reactor and the secondary reactor of the secondary reactor both include a reactor body and a reaction cylinder. The reaction cylinder is disposed in the reactor body and is detachably connected to the reactor body. The material of the reaction cylinder is aluminum.

9. The hydrogen production system based on aluminum-water reaction according to claim 8, characterized in that: A reaction zone and the heat exchange tube are arranged inside the reaction cylinder of the main reactor; the heat exchange tube is arranged around the reaction zone; and mounting holes for fixing the heat exchange tube are provided on both the reaction cylinder and the reactor body.

10. The hydrogen production system based on aluminum-water reaction according to claim 1, characterized in that: The water tank is connected to an external water supply source; the circulation component also includes a refrigerator, and the refrigerator is connected to the water tank via a refrigeration pump.

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