A mobile low-temperature methanol water hydrogen production coupling SOFC power generation system
By employing low-temperature aqueous phase catalytic reforming and a five-layer coupling structure, the high energy consumption and low efficiency problems of methanol steam reforming for hydrogen production and coupled SOFC power generation systems have been solved, enabling direct power supply from high-purity hydrogen and efficient energy utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- MACAU UNIV OF SCI & TECH
- Filing Date
- 2026-03-24
- Publication Date
- 2026-06-05
AI Technical Summary
Existing methanol steam reforming hydrogen production and coupled SOFC power generation systems suffer from high energy consumption during feedstock gasification, numerous impurities in the produced gas that can easily poison the batteries, and low thermal utilization due to the independent operation of the batteries and modules.
By employing low-temperature aqueous phase catalytic reforming technology, an alkaline solution is introduced to absorb carbon dioxide, and a five-layer coupled structure is constructed for the cascade utilization of thermal energy. Combined with a heat exchange structure, waste heat is recovered, thereby achieving the co-production of hydrogen and electricity.
This reduces the heat energy consumption of the hydrogen production reaction, improves the purity of the produced gas, reduces additional separation and purification steps, and enhances the overall energy utilization efficiency of the system.
Smart Images
Figure CN122158618A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of reforming hydrogen production and fuel cell power generation technology, specifically a mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system. Background Technology
[0002] Hydrogen energy, as an energy medium with high energy density and clean characteristics, can effectively store and release energy when combined with distributed energy systems, making it a key approach to building new power systems. Among these, solid oxide fuel cell (SOFC) power generation systems, with their zero-emission and high energy conversion efficiency, have become an important technology for achieving low-carbon development. Traditional methods of producing hydrogen from coal, natural gas, and water electrolysis generally suffer from high energy consumption or poor sustainability. Methanol, through catalytic reforming at relatively low temperatures, produces hydrogen, demonstrating good potential as a stable hydrogen source for SOFC power generation systems.
[0003] However, existing methanol steam reforming hydrogen production and coupled SOFC power generation systems still have technical shortcomings in actual operation. In the early stages of the hydrogen production reaction, traditional methanol steam reforming processes require high-temperature evaporation and vaporization phase change treatment of the methanol-water feedstock, resulting in high initial heat energy consumption. Regarding the quality of the produced gas, the hydrogen concentration generated in traditional reforming processes is low, and the gaseous products contain large amounts of carbon monoxide and carbon dioxide. Directly introducing a mixed gas with a high concentration of carbon monoxide into the SOFC power generation system can lead to electrode poisoning and carbon buildup, affecting battery life and power generation efficiency, typically requiring additional gas separation and purification equipment. In terms of system thermal management, the existing reforming hydrogen production module and the heating module in the SOFC power generation system are mostly independent physical structures, lacking an effective energy cascade utilization and waste heat recovery integration mechanism, resulting in low overall system energy utilization efficiency. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system, which solves the problems of high energy consumption for raw material gasification, numerous impurities in the produced gas that easily poison the battery, and low thermal utilization rate due to independent modules in existing technologies.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] This invention provides a mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system, including a methanol-water proportioning module for preparing a feed liquid containing methanol, water and alkaline solution; and a high-pressure liquid phase pump feeding module for conveying the feed liquid.
[0007] The five-layer coupling structure is used to achieve the coordinated generation of hydrogen and electricity through thermal energy cascade utilization and to produce liquid products; the hydrogen buffer module is used to temporarily store and regulate the flow rate of the hydrogen; the alkali solution circulation and regeneration module is used to regenerate the liquid products to obtain the alkali solution; wherein, the five-layer coupling structure includes an aqueous phase catalytic reforming module, a methanol combustion heating module, and an SOFC power generation module.
[0008] The aqueous catalytic reforming module causes the feed liquid to undergo a catalytic reaction to generate hydrogen and the liquid product. The methanol combustion heating module provides heat energy to the aqueous catalytic reforming module and the SOFC power generation module. The SOFC power generation module receives the hydrogen and converts it into electrical energy.
[0009] The central layer of the five-layer coupling structure is the methanol combustion heating module, the outer layer of the five-layer coupling structure is two symmetrical aqueous phase catalytic reforming modules, and the middle layer between the outer layer and the central layer of the five-layer coupling structure is two symmetrical SOFC power generation modules.
[0010] The methanol-water ratio module, the high-pressure liquid phase pump feeding module, the aqueous phase catalytic reforming module, and the alkali circulation and regeneration module are sequentially connected by stainless steel pipelines for transporting liquids; the aqueous phase catalytic reforming module and the hydrogen buffer module are connected by stainless steel pipelines for transporting gases.
[0011] The aqueous catalytic reforming module includes a U-shaped coil reactor made of SUS316L material. The U-shaped coil reactor is filled with a nickel-magnesium-aluminum hydrotalcite reforming catalyst. The U-shaped coil reactor is equipped with thermocouples, a multi-stage temperature monitoring device, and a feedback instrument PID controller. The alkali in the feed solution is used to capture and absorb the carbon dioxide produced by the catalytic reaction in situ, generating carbonate and bicarbonate ions.
[0012] The liquid product contains carbonate ions, bicarbonate ions, and unreacted methanol. The unreacted methanol, after its content is detected, is recycled back to the methanol-water mixing module. The alkali recycling module contains a saturated calcium hydroxide solution. The carbonate and bicarbonate ions in the liquid product react with the saturated calcium hydroxide solution to generate insoluble calcium carbonate and the alkali solution.
[0013] The hydrogen buffer module includes a high-pressure hydrogen storage cylinder, a pressure monitoring system, and a flow control system. The methanol mass fraction in the feed liquid is 5-30 wt%, and the flow rate of the feed liquid is maintained at 0-5 mL / min.
[0014] The system also includes a heat exchange structure, which is installed on the delivery pipeline between the high-pressure liquid phase pump feeding module and the aqueous phase catalytic reforming module. The heat exchange structure utilizes the high-temperature exhaust gas from the methanol combustion heating module and the waste heat generated by the SOFC power generation module to preheat the feed liquid before it enters the aqueous phase catalytic reforming module.
[0015] The operating temperature of the aqueous catalytic reforming module is maintained at 200-250℃, the operating temperature of the methanol combustion heating module is maintained at 900-1100℃, and the operating temperature of the SOFC power generation module is maintained at 600-900℃. The alkaline solution includes one or more of sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, sodium carbonate aqueous solution, or potassium carbonate aqueous solution; the concentration of the alkaline solution in the feed liquid is maintained at 0-6.25 mol / L.
[0016] This invention provides a mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system. It has the following advantages:
[0017] 1. This invention employs a low-temperature aqueous phase catalytic reforming hydrogen production technology route, eliminating the need for the high-temperature conditions required by traditional steam reforming. Compared to traditional steam reforming, this process eliminates the need for pre-evaporation and vaporization phase change treatment of the methanol-water solution feedstock, directly reducing the heat energy consumption required for the reaction system to operate.
[0018] 2. This invention introduces an alkaline solution into the feedstock solution, simultaneously absorbing the carbon dioxide generated during the catalytic reforming reaction, thus driving the conversion of the intermediate product carbon monoxide towards hydrogen production. This improves the purity of the produced gas, significantly reduces the carbon monoxide concentration, and allows the produced gas to be directly used for SOFC power generation without requiring separation and purification equipment, thereby improving the efficiency of the system's hydrogen production and power generation integration. The alkaline solution after the reaction can be reprocessed and reused after being treated by a recycling module.
[0019] 3. This invention constructs a five-layer coupled structure consisting of central combustion heating, a middle-layer fuel cell power generation, and an outer-layer aqueous reforming reaction. This structure utilizes the high temperature at the center for cascaded heat transfer to the periphery, while simultaneously employing a heat exchange structure to recover waste heat from exhaust gases to preheat the feedstock liquid, achieving highly efficient energy utilization within the system. The overall system structure is compact, supports on-demand adjustment of the hydrogen and electricity supply ratio, and is suitable for applications such as distributed energy, off-grid power supply, and range extension for special equipment. Attached Figure Description
[0020] Figure 1 This is a system architecture diagram of the present invention;
[0021] Figure 2 This is a three-dimensional structural diagram of the system of the present invention;
[0022] Figure 3This is a schematic diagram of the five-layer coupling structure of the present invention.
[0023] The system includes: 1. Methanol-water ratio module; 2. High-pressure liquid phase pump feeding module; 3. Aqueous phase catalytic reforming module; 4. Methanol combustion heating module; 5. SOFC power generation module; 6. Hydrogen buffer module; and 7. Alkali solution recycling and regeneration module. Detailed Implementation
[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0025] Please see the appendix Figure 1 and attached Figure 2 This invention provides a mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system, including a methanol-water proportioning module 1, a high-pressure liquid phase pump feeding module 2, an aqueous phase catalytic reforming module 3, a methanol combustion heating module 4, an SOFC power generation module 5, a hydrogen buffer module 6, and an alkaline solution circulation and regeneration module 7.
[0026] The system is also linked with accessories such as gas-liquid separators, back pressure valves, pumps, blowers, flow meters, valves, and temperature controllers.
[0027] The aqueous catalytic reforming module 3, the methanol combustion heating module 4, and the SOFC power generation module 5 form a five-layer coupled structure. This five-layer coupled structure is used to achieve the coordinated generation of hydrogen and electricity through the cascade utilization of thermal energy, and to produce liquid products.
[0028] The methanol-water proportioning module 1, the high-pressure liquid phase pump feeding module 2, the aqueous phase catalytic reforming module 3, and the alkali solution circulation and regeneration module 7 are sequentially connected via stainless steel pipelines for transporting liquids. The aqueous phase catalytic reforming module 3 and the hydrogen buffer module 6 are connected via stainless steel pipelines for transporting gases.
[0029] The methanol-water mixing module 1 is used to prepare a feed liquid containing methanol, water, and alkaline solution. The high-pressure liquid phase pump feeding module 2 is used to transport the feed liquid, and pump the mixed feed liquid into the aqueous phase catalytic reforming module 3 for hydrogen production.
[0030] The methanol combustion heating module 4 provides the heat energy required for the reaction to the aqueous catalytic reforming module 3 and the SOFC power generation module 5. The aqueous catalytic reforming module 3 enables the feed liquid to undergo a catalytic reaction to produce hydrogen and liquid products.
[0031] After the products of the reforming reaction are separated by a gas-liquid separator, the produced hydrogen enters the hydrogen buffer module 6. The hydrogen buffer module 6 is used to temporarily store and regulate the flow rate of hydrogen. The hydrogen buffer module 6 supplies hydrogen to the SOFC power generation module 5 as needed.
[0032] SOFC power generation module 5 receives hydrogen and converts it into electrical energy for output, realizing the cogeneration of hydrogen and electricity. The liquid product obtained after gas-liquid separation enters alkali recycling module 7 for processing. Alkali recycling module 7 regenerates the liquid product to obtain alkali, which is then recycled.
[0033] In this embodiment, based on the continuous supply requirements of materials at the system's front end, the methanol-water proportioning module 1 is used to prepare a feedstock solution containing methanol, water, and alkali. In terms of specific structural layout, the methanol-water proportioning module 1 includes a water storage area, a methanol storage area 8, and an alkali storage area 9. The system's feedstocks are methanol and water, which are proportioned by the methanol-water proportioning module 1 and then mixed with alkali. To ensure the stable progress of the reforming hydrogen production reaction, the feedstock proportion of methanol and water is 5-30 wt%.
[0034] To complement the above material preparation process (i.e., to meet the requirements for in-situ carbon fixation in subsequent reactions), the alkaline solution includes one of the following: sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, sodium carbonate aqueous solution, or potassium carbonate aqueous solution. The concentration of the alkaline solution in the feed solution is maintained at 0-6.25 mol / L.
[0035] After the feed solution is prepared, the mixed feed solution is pumped into the aqueous catalytic reforming module 3 by the high-pressure liquid phase pump feeding module 2 for hydrogen production. The high-pressure liquid phase pump feeding module 2 is connected to the methanol-water proportioning module 1 via a stainless steel pipeline and is responsible for transporting the feed solution. As the power source for transportation, the flow rate of this module system is set to be maintained at 0-5 mL / min.
[0036] The pump body hardware structure and specific pressure regulation and control method of the high-pressure liquid phase pump feeding module 2 can be configured and selected by those skilled in the art according to the set flow rate and pressure parameters. Its fluid transportation and pressurization principle is a well-known technology in the field and will not be described in detail here.
[0037] In this embodiment, based on the design requirements of cascade utilization of thermal energy, the aqueous catalytic reforming module 3, the methanol combustion heating module 4, and the SOFC power generation module 5 are integrated into a five-layer coupled structure.
[0038] At the very center of the five-layer coupled structure is the methanol combustion layer, which serves as the initial heat source for the system. This layer is the methanol combustion heating module 4. Its basic operating logic is to provide the thermal energy required for the operation of the other two SOFC power generation modules 5 and the two aqueous catalytic reforming modules 3 by burning part of the methanol feedstock.
[0039] Inside the specific integrated cavity, methanol is injected and fully mixed with air introduced by the blower before entering the burner for combustion and heat release, with the combustion temperature maintained at 900-1100℃.
[0040] For the specific injector structure and ignition control unit inside the methanol combustion heating module 4, those skilled in the art can select them based on conventional burner design. The fuel atomization and combustion control mechanism is a well-known technology in the field and will not be described in detail here.
[0041] The middle layer of the five-layer coupling structure is the SOFC power generation module 5. In conjunction with the internal heat conduction path, this module has a plate-type structure. Due to its physical position close to the central combustion layer, this module directly absorbs radiation and conducts heat to maintain the temperature environment required for the electrochemical reaction, which is 600-900℃. For the specific material composition and micropore arrangement inside the plate-type solid oxide fuel cell (SOFC), those skilled in the art can refer to existing mature fuel cell technologies. Its electron and oxygen ion conduction mechanisms are well-known in the field and will not be elaborated upon here.
[0042] The outermost layer of the five-layer coupling structure is the aqueous reforming reaction coil, corresponding to aqueous catalytic reforming module 3. The aqueous reforming reaction coil adopts a U-shaped coil structure. Based on this shape, the system utilizes a coupled, disc-shaped microchannel reaction tube to achieve cascaded heat utilization. At the specific heat exchange surface, being on the outermost side, the coil exchanges heat with the high temperature generated by the SOFC power generation to ensure that the methanol-water solution reaches the temperature required for the catalytic reforming reaction, i.e., 200-250℃.
[0043] By integrating the system's overall thermal management network, the methanol-water solution exchanges heat with the waste gas generated by the SOFC power generation and the waste gas generated by methanol combustion before entering the reaction coil, thereby preheating the methanol-water solution. This heat exchange structure design effectively recovers waste heat. Furthermore, to control heat loss at the system boundaries, all pipe connections are insulated to ensure near-ideal reaction conditions.
[0044] See appendix Figure 3 In this embodiment, based on the continuous material transport process of the aforementioned system, the aqueous phase catalytic reforming module 3, which is located on the outer layer of the five-layer coupling structure, performs the aqueous phase reforming hydrogen production process.
[0045] To meet the actual corrosion resistance requirements of the process, the reaction tube of the aqueous catalytic reforming module 3 is made of corrosion-resistant SUS316L material. To accommodate the external cascade heat exchange requirements, the reaction tube adopts a U-shaped coil structure. Internally, the U-shaped coil reactor is filled with granular nickel-magnesium-aluminum hydrotalcite reforming catalyst to catalyze the aqueous reforming of methanol-water solution for hydrogen production.
[0046] To control the reaction conditions, heating units are attached to the outer wall of the reaction tube. The system uses high-precision thermocouples and a multi-segment temperature monitoring device to monitor the temperature inside the tube, combined with a feedback instrument PID controller for numerical display and parameter adjustment. Overall, the above hardware structure, along with the pressure monitoring system, flow control system, reactor programmed temperature rise system, and data collection and analysis system, works together to supervise and control, ensuring the high-efficiency and high-precision completion of the catalytic reaction. Based on the coordinated operation of these control units, the operating temperature of the aqueous catalytic reforming module 3 is maintained at 200-250 degrees Celsius.
[0047] For the underlying operating logic of the reactor programmed heating system and PID controller, those skilled in the art can configure the program according to conventional chemical automation control schemes. The signal acquisition and temperature closed-loop feedback regulation principle are well-known technologies in this field and will not be elaborated here.
[0048] Under set temperature and pressure conditions, methanol and water in the feed solution undergo a catalytic reaction on the surface of the nickel-magnesium-aluminum hydrotalcite reforming catalyst. The surface catalytic reaction equations involved are as follows:
[0049] ;
[0050] During the methanol-water phase reforming reaction to produce hydrogen, in conjunction with the above reaction formula, the alkali in the feed solution plays a role in in-situ absorption.
[0051] Specifically, the alkaline solution captures and absorbs the carbon dioxide produced by the system, generating carbonate and bicarbonate ions. Based on the principle of chemical equilibrium shift, simultaneously using the alkaline solution to absorb the generated carbon dioxide can shift the reaction pathway of the intermediate carbon monoxide towards hydrogen production, while inhibiting the methanation reaction.
[0052] The above-mentioned in-situ capture and absorption process with alkaline solution effectively promotes the conversion of the harmful intermediate carbon monoxide. Through this process, the final hydrogen concentration produced by the aqueous catalytic reforming module 3 reaches over 99%, while the carbon monoxide concentration in the gaseous products drops to below 0.5%.
[0053] Because it achieves near-zero emissions in the high-concentration hydrogen production process, the produced hydrogen does not require separation and purification processes to meet the standards for use in solid oxide fuel cells (SOFCs). This design avoids the need for additional separation and purification modules, and the high-quality hydrogen produced can directly supply power to SOFC power generation module 5, solving the problems of high-concentration carbon monoxide toxicity to the battery and carbon emissions during the reaction in subsequent SOFC power generation processes.
[0054] In this embodiment, after the catalytic reaction is completed in the aqueous catalytic reforming module 3, the generated product is in a gas-liquid mixed state. Based on the subsequent process requirement of independently processing the gas and liquid, the reaction product is introduced into a gas-liquid separator for physical separation via pipeline. After separation by the gas-liquid separator, the obtained liquid product enters the alkaline solution recycling module 7. At the same time, the hydrogen product obtained by separation (more than 99% purity) enters the hydrogen buffer module 6 for temporary storage.
[0055] The hydrogen buffer module 6 is mainly used for gas storage and pipeline pressure maintenance. Its main structure is a high-pressure resistant hydrogen storage cylinder. To meet the requirements for safe storage and precise supply of high-purity hydrogen, the hydrogen buffer module 6 is equipped with a pressure monitoring system and a flow control system.
[0056] Specifically, in the gas path actuator, the pipeline containing the hydrogen buffer module 6 is connected to a back pressure valve, a flow meter, and a control valve. These components work together to form a gas storage output circuit with pressure and flow control. Based on the actual operating conditions of the system, when the system's reforming hydrogen production exceeds the instantaneous power generation consumption, the excess hydrogen can be safely stored in a high-pressure hydrogen storage cylinder, thereby achieving physical buffering of the gas volume and stabilizing the system pressure.
[0057] Based on the aforementioned pressure and flow feedback regulation mechanism, the hydrogen buffer module 6 establishes a continuous gas delivery channel with the downstream energy-consuming unit. Based on the real-time demand of the terminal load, the system, through the flow control system of the hydrogen buffer module 6, supplies the temporarily stored hydrogen to the SOFC power generation module 5 for power generation as needed. As mentioned earlier, since the front-end hydrogen production process achieves near-zero emissions, the gas entering the hydrogen buffer module 6 already meets the standards for fuel cell use. Therefore, this gas can be directly supplied to the SOFC power generation module 5, realizing the cogeneration of hydrogen and electricity.
[0058] For the specific separation structure of the gas-liquid separator and the pressure-bearing material of the inner liner of the high-pressure hydrogen storage cylinder, those skilled in the art can configure and select according to conventional chemical separation specifications and high-pressure gas storage standards. Its physical gas-liquid separation mechanism and fluid storage safety design are well-known technologies in this field and will not be elaborated here.
[0059] In this embodiment, after the physical separation process is completed in the gas-liquid separator, the obtained liquid product is transported to the alkaline solution circulation and regeneration module 7 via pipeline for processing. Based on the in-situ carbon fixation mechanism of the front-end aqueous phase catalytic reforming reaction, the liquid product is specifically an aqueous solution containing carbonate, bicarbonate, and unreacted methanol.
[0060] For the unreacted methanol in the aqueous solution product, the system establishes a circulation branch through pipelines. Specifically, after the content of unreacted methanol is detected, it is recycled back to methanol-water mixing module 1, thereby improving the utilization efficiency of methanol.
[0061] To restore the activity of the absorbent, the alkali solution circulation regeneration module 7 is equipped with... Saturated solution. During fluid mixing, carbonate and bicarbonate ions react with... The saturated solution reacts to produce insoluble calcium carbonate and a corresponding alkaline solution. The chemical reaction equations involved in this regeneration process are as follows:
[0062] ;
[0063] ;
[0064] As the above reaction proceeds, the product enters the solid-liquid separation stage. Calcium carbonate can be collected and used in the building materials, food, and other industries.
[0065] Meanwhile, the generated alkaline solution can be recycled after concentration adjustment. For the specific precipitation purification and fluid transport structure inside the alkaline solution recycling module 7, those skilled in the art can configure and select it according to conventional chemical solid-liquid separation standards. Its liquid component detection and separation mechanism are well-known technologies in the field and will not be elaborated upon here.
[0066] In this embodiment, to ensure the stability of the entire device, the mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system provided by the present invention is equipped with temperature sensors at corresponding locations in the operating pipeline and reaction system to monitor various parameters in real time, so as to ensure the efficient and stable operation of the system.
[0067] In this embodiment, for the control of the core reaction area, combined with the specific pipeline physical layout, a heating unit is attached to the outer wall of the pipeline. Regarding data acquisition and feedback adjustment, the system employs high-precision thermocouples to perform multi-segment temperature monitoring, combined with PID control and display using feedback instruments.
[0068] Based on the aforementioned temperature monitoring loop, this control unit collaborates with the pressure monitoring system, flow control system, reactor programmed temperature rise system, and data collection and analysis system for monitoring and control. In this embodiment, through data interaction and coordinated intervention between multiple systems, the system relies on closed-loop logic to reduce operating condition fluctuations, thereby ensuring the high-efficiency and high-precision completion of the catalytic reaction.
[0069] In this embodiment, at the physical structure level, to further maintain the established thermodynamic environment, all pipe connections are insulated. This passive thermal management design effectively reduces heat loss during fluid transport across regions, ensuring near-ideal reaction conditions in this embodiment.
[0070] For the specific model selection of high-precision thermocouples, and the structure of the internal sensor transmitters of pressure monitoring systems and flow control systems, those skilled in the art can configure and select them according to conventional chemical process automation control specifications. The acquisition and conversion of underlying signals and the PID closed-loop calculation mechanism are well-known technologies in this field and will not be elaborated here.
[0071] In a specific application embodiment, the system uses methanol and water as raw materials, which are prepared in a ratio of 10 wt% by the methanol-water mixing module 2 as needed. The prepared mixture is then thoroughly mixed with a 3.125 mol / L potassium hydroxide alkaline solution, wherein the molar ratio of potassium hydroxide to methanol is controlled at 1:2. This mixed raw material solution is then pumped into the aqueous phase catalytic reforming module 3 by the high-pressure liquid phase pump feeding module 1 for hydrogen production. The system maintains a reaction flow rate of 0.05 mL / min and a pipeline reaction pressure of 3 MPa.
[0072] Under this operating condition, the actual reaction temperature of the aqueous catalytic reforming module 3 is controlled at 230℃. In the methanol combustion heating module 4, the actual combustion temperature of the methanol-air mixture is around 900℃, and the methanol required for combustion heating accounts for 31.9% of the total methanol consumption of the system. The actual reaction temperature of the SOFC power generation module 5 is maintained at 750℃.
[0073] Theoretical calculations have verified that the entire system can stably produce 150.55L of high-purity hydrogen after consuming 1kg of methanol feedstock. Under the operating conditions of the SOFC power generation module 5 with a power generation efficiency of 60% and a rated power of 5kW, the system can equivalently output [hydrogen]. Based on this low-temperature reforming and thermal energy cascade utilization architecture, the overall power generation efficiency of the system is 60.51% higher than that of the traditional methanol steam reforming method, and it supports flexible adjustment of the system's hydrogen supply and power supply ratio according to demand requirements.
Claims
1. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system, characterized in that, include: Methanol-water ratio module (1), which is used to prepare raw material liquid containing methanol, water and alkaline solution; High-pressure liquid phase pump feeding module (2), which is used to transport the raw material liquid; A five-layer coupling structure is used to achieve the coordinated generation of hydrogen and electricity through the cascade utilization of thermal energy, and to produce liquid products; A hydrogen buffer module (6) is used to temporarily store and regulate the flow rate of the hydrogen. Alkali recycling module (7), which is used to regenerate the liquid product to obtain the alkali solution; The five-layer coupling structure includes an aqueous catalytic reforming module (3), a methanol combustion heating module (4), and an SOFC power generation module (5).
2. The mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, The aqueous phase catalytic reforming module (3) is used to catalytically react the feed liquid to generate hydrogen and the liquid product; The methanol combustion heating module (4) is used to provide thermal energy for the aqueous catalytic reforming module (3) and the SOFC power generation module (5); The SOFC power generation module (5) is used to receive the hydrogen and convert it into electrical energy.
3. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, The central layer of the five-layer coupling structure is the methanol combustion heating module (4). The outer layer of the five-layer coupling structure is a two-layer symmetrical aqueous catalytic reforming module (3); The middle layer between the outer layer and the central layer of the five-layer coupling structure is a two-layer symmetrical SOFC power generation module (5).
4. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, The methanol-water ratio module (1), the high-pressure liquid phase pump feeding module (2), the aqueous phase catalytic reforming module (3), and the alkali solution circulation and regeneration module (7) are connected in sequence through stainless steel pipelines for transporting liquids; The aqueous catalytic reforming module (3) and the hydrogen buffer module (6) are connected by stainless steel pipelines for transporting gas.
5. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, The aqueous phase catalytic reforming module (3) includes a U-shaped coil reactor made of SUS316L material. The U-shaped coil reactor is filled with nickel-magnesium-aluminum hydrotalcite reforming catalyst. The U-shaped coil reactor is equipped with thermocouples, multi-stage temperature monitoring devices and feedback instrument PID controllers. The alkali in the feed solution is used to capture and absorb carbon dioxide produced by the catalytic reaction in situ and generate carbonate and bicarbonate ions.
6. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 5, characterized in that, The liquid product contains carbonate, bicarbonate and unreacted methanol. The unreacted methanol is recycled to the methanol-water ratio module (1) after its content is detected. The alkaline solution recycling module (7) is equipped with a calcium hydroxide saturated solution. The carbonate and bicarbonate ions in the liquid product react with the calcium hydroxide saturated solution to generate calcium carbonate and the alkaline solution.
7. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, The hydrogen buffer module (6) includes a high-pressure hydrogen storage cylinder, a pressure monitoring system, and a flow control system; The methanol content in the feed liquid is 5-30 wt%, and the flow rate of the feed liquid is maintained at 0-5 mL / min.
8. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, It also includes a heat exchange structure, which is installed on the conveying pipeline between the high-pressure liquid phase pump feeding module (2) and the aqueous phase catalytic reforming module (3); The heat exchange structure uses the high-temperature exhaust gas discharged from the methanol combustion heating module (4) and the waste heat generated by the SOFC power generation module (5) to preheat the feed liquid before it enters the aqueous catalytic reforming module (3).
9. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, The working temperature of the aqueous catalytic reforming module (3) is maintained at 200-250℃, the working temperature of the methanol combustion heating module (4) is maintained at 900-1100℃, and the working temperature of the SOFC power generation module (5) is maintained at 600-900℃.
10. A mobile low-temperature methanol-water hydrogen production coupled SOFC power generation system according to claim 1, characterized in that, The alkaline solution includes one or more of the following: sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, sodium carbonate aqueous solution, or potassium carbonate aqueous solution; The concentration of alkali in the raw material solution is maintained at 0-6.25 mol / L.