A system and method for producing green methanol from biomass through magnesium-based solid-state hydrogen storage via solid-state hydrogen storage

Abstract

This invention discloses a system and method for producing green methanol from biomass gasification using magnesium-based solid-state hydrogen storage, belonging to the field of biomass gasification for green methanol production technology. The system includes: agricultural and forestry waste biomass raw materials, wind and solar new energy / fluctuating green electricity, a wide-power water electrolysis hydrogen production device, an atmospheric / medium-pressure pure oxygen buffer tank, a magnesium-based solid-state hydrogen storage device, an HT-TES (hydrogenation system), a biomass gasification furnace, a high-temperature steam generator, a high-temperature syngas waste heat exchanger, a syngas purification and methanol synthesis unit, and a liquid methanol product storage and transportation tank. This invention fully utilizes continuous and intermittent waste heat in a tiered manner, reducing the energy consumption of gasification and the electricity consumption of magnesium-based dehydrogenation; magnesium-based solid-state hydrogen storage reduces the safety costs and land occupation of high-pressure explosion-proof spherical tanks; it adapts to the fluctuating characteristics of green electricity, reducing waste electricity; it can relatively accurately control the C-H ratio of methanol synthesis, improving the purity and yield of the product, and has certain economic and engineering practicality.

Description

Technical Field

[0001] This invention belongs to the field of synergistic coupling technology of new energy and thermal power generation, specifically relating to a system and method for producing green methanol from biomass gasification using magnesium-based solid hydrogen storage. Background Technology

[0002] Carbon recycling technologies, exemplified by biomass gasification to methanol, are an important pathway to achieving carbon neutrality in the chemical industry. Traditional biomass gasification processes typically use air, pure oxygen, or steam as gasifying agents to convert agricultural and forestry waste into crude syngas, which is then purified and catalytically synthesized into methanol. However, these processes rely on fossil fuels to provide the heat and gasifying agents required for gasification, resulting in high carbon emission intensity. Furthermore, they require a continuous and stable supply of materials and energy, making them difficult to adapt to the volatile characteristics of renewable energy sources.

[0003] As an improvement, wind and solar energy-driven water electrolysis for hydrogen and oxygen production technology provides a zero-carbon raw material source for green methanol synthesis. However, wind and solar power output has significant intermittency and randomness. Directly driving the electrolysis unit will lead to drastic fluctuations in equipment load and reduced operating efficiency. Moreover, the intermittently produced green hydrogen and green oxygen cannot directly match the continuous production needs of biomass gasification and methanol synthesis, which can easily cause material supply and demand imbalance and poor system operation stability.

[0004] Furthermore, magnesium-based solid-state hydrogen storage technology, due to its high hydrogen storage density and good safety, is considered an effective solution for green hydrogen storage and buffering. However, its hydrogen absorption process releases a large amount of high-temperature heat energy, and the dehydrogenation process requires external heating. If this heat effect is not efficiently recovered and utilized, it will not only waste energy but also increase the external energy consumption of the dehydrogenation process. Although high-temperature molten salt thermal energy storage technology has achieved mature applications in the field of concentrated solar power (CSP) and can realize large-scale thermal energy storage and dispatch, a mature dispatch scheme has not yet been formed in the ternary coupling scenario of biomass gasification, solid-state hydrogen storage, and water electrolysis for hydrogen production. In addition, SOEC can efficiently electrolyze water to produce hydrogen at high temperatures and can utilize industrial waste heat or thermal energy from thermal storage systems to reduce power consumption, but its coupling mechanism with biomass gasification to methanol systems is still unclear. In summary, in the current biomass gasification coupled with green electricity to produce hydrogen and green methanol systems, the green electricity to produce hydrogen and oxygen cannot be continuously and stably supplied, which is incompatible with the continuous production needs of chemical industry, and the waste heat of the process is difficult to utilize effectively, which may cause unstable system operation and high energy consumption. Summary of the Invention

[0005] This invention provides a system and method for producing green methanol from biomass gasification using magnesium-based solid-state hydrogen storage. The purpose is to solve the problems in current biomass gasification coupled with green electricity to produce hydrogen and green methanol systems, which have issues such as the inability to continuously and stably supply hydrogen and oxygen from green electricity, mismatch with the continuous production needs of chemical industries, and difficulty in effectively utilizing process waste heat, which may lead to unstable system operation and high energy consumption.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a system for producing green methanol from biomass gasification using magnesium-based solid-state hydrogen storage, comprising agricultural and forestry waste biomass feedstock, wind and solar renewable energy / fluctuation-based green electricity, a wide-power water electrolysis hydrogen production device, an atmospheric / medium-pressure pure oxygen buffer tank, a magnesium-based solid-state hydrogen storage device, an HT-TES (hydrogen-to-solid-state system), a biomass gasification furnace, a high-temperature steam generator, a high-temperature syngas waste heat exchanger, a syngas purification and methanol synthesis unit, and a liquid methanol finished product storage and transportation tank; wherein: Wind and solar renewable energy / fluctuating green electricity are used to drive a wide-power water electrolysis hydrogen production unit; the oxygen output end of the wide-power water electrolysis hydrogen production unit is connected to a biomass gasification furnace via an atmospheric / medium-pressure pure oxygen buffer tank, and the hydrogen output end is connected to a magnesium-based solid hydrogen storage device before being connected to a methanol synthesis unit; agricultural and forestry waste biomass raw materials are connected to the biomass gasification furnace; the crude syngas output end of the biomass gasification furnace is connected to the methanol synthesis unit after passing through a high-temperature syngas waste heat exchanger and a syngas washing and purification unit; the heat release ends of the high-temperature syngas waste heat exchanger and the magnesium-based solid hydrogen storage device are both connected to an HT-TES, and the heat release ends of the HT-TES are connected to a high-temperature steam generator and the magnesium-based solid hydrogen storage device, respectively, with the high-temperature steam generator connected to the biomass gasification furnace.

[0007] In some implementations, the wide-power water electrolysis hydrogen production unit is an intermittent operation unit, driven by wind and solar renewable energy / fluctuating green electricity to produce hydrogen and oxygen intermittently.

[0008] In some implementations, the atmospheric / medium pressure pure oxygen buffer tank is used to receive oxygen intermittently produced by a wide-power water electrolysis hydrogen production unit and to continuously supply oxygen to the biomass gasifier as a gasifying agent.

[0009] In some implementations, the magnesium-based solid-state hydrogen storage device releases thermal energy at a first preset temperature to the HT-TES during the hydrogen absorption phase, and during the dehydrogenation phase, the HT-TES provides thermal energy at a second preset temperature to drive the magnesium-based dehydrogenation.

[0010] Furthermore, the magnesium-based solid-state hydrogen storage device dehydrogenates and releases green hydrogen, which is used to adjust the carbon-hydrogen ratio of the feed gas required for the methanol synthesis unit.

[0011] In some implementations, the HT-TES serves as the plant's thermal energy dispatch center, used to store the sensible heat recovered by the high-temperature syngas waste heat exchanger and the heat released during the hydrogen absorption stage of the magnesium-based solid hydrogen storage device, and to continuously supply heat to the high-temperature steam generator and the magnesium-based solid hydrogen storage device.

[0012] In some embodiments, the high-temperature steam generator is continuously heated by the HT-TES, continuously supplying steam at a third preset temperature to the biomass gasifier.

[0013] In some embodiments, the biomass gasifier is used to receive agricultural and forestry waste biomass raw materials and oxygen supplied by an atmospheric / medium pressure pure oxygen buffer tank and water vapor supplied by a high-temperature steam generator, and continuously outputs crude syngas at a fourth preset temperature.

[0014] In some embodiments, the methanol synthesis unit is a green methanol continuous synthesis tower, and the synthesis gas washing and purification unit continuously supplies the washed and purified synthesis gas to the green methanol continuous synthesis tower; the crude methanol produced by the green methanol continuous synthesis tower is purified by distillation and then transported to the liquid methanol finished product storage and transportation tank for storage and transportation.

[0015] This invention also provides a method for producing green methanol from biomass gasification using magnesium-based solid hydrogen storage, which is based on the above-mentioned system for producing green methanol from biomass gasification using magnesium-based solid hydrogen storage, and includes the following steps: S1. Utilize wind and solar new energy / fluctuating green electricity to drive the intermittent operation of a wide-power water electrolysis hydrogen production device to produce oxygen and green hydrogen through water electrolysis. S2. Oxygen is transported to an atmospheric / medium-pressure pure oxygen buffer tank for buffering, and then oxygen is continuously supplied to the biomass gasification furnace; green hydrogen is transported to a magnesium-based solid hydrogen storage device for hydrogen absorption and storage, and the heat energy released by the magnesium-based solid hydrogen storage device during the hydrogen absorption process is charged into HT-TES. S3. HT-TES is used to continuously heat the high-temperature steam generator, which generates steam and delivers it to the biomass gasification furnace; HT-TES is used to provide the heat energy required for dehydrogenation to the magnesium-based solid hydrogen storage device, which drives the magnesium-based solid hydrogen storage device to dehydrogenate, and the green hydrogen released by dehydrogenation is delivered to the green methanol continuous synthesis tower. S4. Agricultural and forestry waste biomass raw materials are continuously fed into the biomass gasification furnace, where they undergo continuous gasification reaction with supplied oxygen and water vapor to produce crude syngas. S5. The crude syngas is transported to the high-temperature syngas waste heat exchanger, where the sensible heat of the crude syngas is recovered and charged into the HT-TES. The cooled crude syngas is then transported to the syngas washing and purification unit to obtain washed and purified syngas, which is then transported to the green methanol continuous synthesis tower. S6. Green hydrogen and washed and purified syngas are continuously synthesized into methanol in a green methanol continuous synthesis tower. The crude methanol produced is purified by distillation and then transported to a liquid methanol product storage tank for storage.

[0016] Compared with existing technologies, the system and method for producing green methanol from biomass through magnesium-based solid hydrogen storage, as described in this invention, have the following advantages: This invention discloses a system for biomass gasification to produce green methanol using magnesium-based solid hydrogen storage. In situations with complex upstream wind, solar, and power generation or varying environmental conditions, the system's buffered equipment configuration allows the downstream gasifier and synthesis tower to operate at relatively full load and stably, similar to traditional chemical plants, thus extending catalyst life to some extent. This invention utilizes the reservoir effect of a high-temperature thermal storage hub to cascade and utilize both continuous and intermittent waste heat from the process, achieving zero energy consumption for gasification to produce steam and zero electricity consumption for magnesium-based dehydrogenation, resulting in superior overall energy efficiency. It eliminates the need for relatively expensive air separation oxygen production stations and electric heating boiler groups, and the magnesium-based solid hydrogen storage, to some extent, eliminates the safety costs and land occupation associated with high-pressure explosion-proof spherical tanks, making it more economical than traditional coal chemical processes and possessing significant practical value. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 This is a schematic diagram of the architecture of a magnesium-based solid hydrogen storage system for biomass gasification to produce green methanol, according to the present invention.

[0019] Among them, 100, agricultural and forestry waste biomass raw materials, 200, wind and solar new energy / fluctuating green electricity, 300, biomass gasification furnace, 400, HT-TES, 500, green methanol continuous synthesis tower, 600, liquid methanol finished product storage and transportation tank. 201. Wide-power water electrolysis hydrogen production unit; 202. Atmospheric / medium-pressure pure oxygen buffer tank; 301. High-temperature syngas waste heat exchanger; 302. Syngas scrubbing and purification unit; 401. High-temperature steam generator; 402. Magnesium-based solid hydrogen storage device. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] It should be noted that the apparatus and methods disclosed in the embodiments herein can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments herein. In this regard, each block in a flowchart or block diagram may represent a module, program, or part of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system to perform the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0024] In addition, the functional modules in the various embodiments of this article can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0025] like Figure 1 As shown, this invention provides a system for producing green methanol from biomass gasification using magnesium-based solid-state hydrogen storage, comprising: agricultural and forestry waste biomass feedstock 100; wind and solar new energy / fluctuating green electricity 200; a wide-power water electrolysis hydrogen production device 201; an atmospheric / medium-pressure pure oxygen buffer tank 202; a magnesium-based solid-state hydrogen storage device 402; an HT-TES 400; a biomass gasification furnace 300; a high-temperature steam generator 401; a high-temperature syngas waste heat exchanger 301; a syngas scrubbing and purification unit 302; and a methanol synthesis unit; wherein: The wind and solar new energy / fluctuating green electricity 200 is used to drive the wide-power water electrolysis hydrogen production device 201; the oxygen output end of the wide-power water electrolysis hydrogen production device 201 is connected to the biomass gasification furnace 300 via the atmospheric / medium pressure pure oxygen buffer tank 202, and the hydrogen output end is connected to the magnesium-based solid hydrogen storage device 402 and then to the methanol synthesis unit; agricultural and forestry waste biomass raw material 100 is connected to the biomass gasification furnace 300; the crude syngas output end of the biomass gasification furnace 300 is connected to the methanol synthesis unit via the high-temperature syngas waste heat exchanger 301 and the syngas washing and purification unit 302; the heat release ends of the high-temperature syngas waste heat exchanger 301 and the magnesium-based solid hydrogen storage device 402 are both connected to the HT-TES400, and the heat release ends of the HT-TES400 are connected to the high-temperature steam generator 401 and the magnesium-based solid hydrogen storage device 402 respectively, and the high-temperature steam generator 401 is connected to the biomass gasification furnace 300.

[0026] The system of this invention achieves efficient resource utilization of agricultural and forestry waste biomass raw materials 100 through a coupled integrated architecture, while reducing the raw material cost of methanol production. Based on the wide-power water electrolysis hydrogen production device 201, which is adapted to the power supply characteristics of wind and solar new energy / fluctuating green electricity 200, the fluctuating green electricity can be used for continuous chemical production. The magnesium-based solid hydrogen storage device 402 can suppress the intermittent fluctuations of the hydrogen process and ensure the continuous and stable hydrogen supply of the methanol synthesis unit. The high-temperature synthesis gas waste heat exchanger 301 and HT-TES400 work together to achieve centralized recovery of the sensible heat of crude synthesis gas and the heat release of hydrogen storage. Together with the high-temperature steam generator 401, a whole-plant heat energy circulation supply system is formed, eliminating the energy consumption and cost of independent heat sources. The atmospheric / medium-pressure pure oxygen buffer tank 202 connects intermittent oxygen production with continuous gasification oxygen supply. The biomass gasification furnace 300 works in conjunction with purification and synthesis to form a production chain from biomass raw materials to green methanol. The system of this invention has the advantages of efficient green electricity consumption, biomass carbon sequestration, cascade utilization of thermal energy, and continuous and stable operation. It has good green electricity adaptability, high thermal energy utilization rate, relatively stable raw material supply, and zero carbon or even negative carbon methanol products.

[0027] In some operating conditions, in the biomass gasification to green methanol system of magnesium-based solid hydrogen storage according to the present invention, the wide-power water electrolysis hydrogen production device 201 is an intermittent operation device, which is compatible with the power supply characteristics of wind and solar new energy / fluctuating green electricity 200. It can adapt to the intermittent fluctuations of green electricity without the need for additional voltage stabilization and regulation equipment, avoiding the waste of green electricity, protecting the wide-power water electrolysis hydrogen production device 201 from the impact of sudden voltage and current changes, and extending the service life of the equipment. The temporary storage and stabilization function of the atmospheric / medium pressure pure oxygen buffer tank 202 converts the oxygen intermittently produced by the wide-power water electrolysis hydrogen production device 201 into a continuous and stable gasifying agent to supply the biomass gasifier 300, so that the intermittent oxygen production and continuous gasification conditions can be matched, ensuring that the gasification reaction of the biomass gasifier 300 continues to proceed steadily, improving gasification efficiency and the stability of crude syngas production.

[0028] Furthermore, this invention utilizes the thermal energy linkage characteristics of the magnesium-based solid-state hydrogen storage device 402, which involves hydrogen absorption and exothermic release, and dehydrogenation and endothermic absorption, to enable thermal energy interaction between the magnesium-based solid-state hydrogen storage device 402 and the HT-TES400. The heat energy released during the hydrogen absorption stage is recovered and stored, and stable dehydrogenation is achieved using the stored heat energy during the dehydrogenation stage, eliminating the need for additional external heat energy to drive the dehydrogenation process. The green hydrogen produced by the magnesium-based solid-state hydrogen storage device 402 after dehydrogenation is used to adjust the carbon-hydrogen ratio of the feed gas in the methanol synthesis unit. This allows for precise control of the feed gas ratio according to the synthesis reaction requirements, avoiding low reaction efficiency caused by an imbalance in the carbon-hydrogen ratio of the synthesis gas, reducing ineffective byproducts, and improving the purity and yield of green methanol synthesis.

[0029] In some operating conditions, in the biomass gasification to green methanol system using magnesium-based solid hydrogen storage of the present invention, the HT-TES400 serves as the plant's thermal energy dispatch center. It centrally collects the sensible heat recovered by the high-temperature syngas waste heat exchanger 301 and the hydrogen absorption and release heat from the magnesium-based solid hydrogen storage device 402, achieving centralized control and efficient dispatch of decentralized waste heat, avoiding heat loss and waste, and ensuring continuous and stable heating for the high-temperature steam generator 401 and the magnesium-based solid hydrogen storage device 402. The high-temperature steam generator 401 of the present invention continuously produces high-temperature steam using the HT-TES400, providing a stable gasification auxiliary medium for the biomass gasifier 300, optimizing the gasification reaction conditions, and improving the quality and production efficiency of the crude syngas.

[0030] Furthermore, the biomass gasifier 300 of this invention, combined with agricultural and forestry waste biomass raw material 100, oxygen, and high-temperature steam, can achieve efficient and continuous gasification, precisely control the output temperature of the crude syngas, and ensure stable operation of subsequent waste heat recovery and purification processes. This invention achieves continuous synthesis based on a green methanol continuous synthesis tower 500, and ensures the purity of the green methanol product meets standards through distillation purification and storage and transportation in a liquid methanol product storage and transportation tank 600.

[0031] This invention also provides a method for producing green methanol from biomass gasification using magnesium-based solid hydrogen storage, comprising the following steps: S1. Using wind and solar new energy / fluctuating green electricity 200 to drive the wide-power water electrolysis hydrogen production device 201 to operate intermittently, producing oxygen and green hydrogen by electrolysis of water; S2. Oxygen is delivered to atmospheric / medium pressure pure oxygen buffer tank 202 for buffering, and then oxygen is continuously supplied to biomass gasification furnace 300; green hydrogen is delivered to magnesium-based solid hydrogen storage device 402 for hydrogen absorption and storage, and the heat energy released by magnesium-based solid hydrogen storage device 402 during the hydrogen absorption process is charged into HT-TES400. S3. HT-TES400 continuously supplies heat to high-temperature steam generator 401, which generates steam and delivers it to biomass gasifier 300; HT-TES400 provides the thermal energy required for dehydrogenation to magnesium-based solid hydrogen storage device 402, driving the magnesium-based solid hydrogen storage device 402 to dehydrogenate, and the green hydrogen released by dehydrogenation is delivered to green methanol continuous synthesis tower 500. S4. Agricultural and forestry waste biomass raw material 100 is continuously fed into biomass gasifier 300, where it undergoes continuous gasification reaction with supplied oxygen and water vapor to produce crude syngas. S5. The crude syngas is transported to the high-temperature syngas waste heat exchanger 301, where the sensible heat of the crude syngas is recovered and charged into HT-TES400. The cooled crude syngas is then transported to the syngas washing and purification unit 302 to obtain washed and purified syngas, which is then transported to the green methanol continuous synthesis tower 500. S6. Green hydrogen and washed and purified syngas are continuously synthesized into methanol in a green methanol continuous synthesis tower 500. The crude methanol produced is purified by distillation and then transported to a liquid methanol finished product storage tank 600 for storage.

[0032] The present invention will be further described in detail below through some embodiments.

[0033] This invention discloses a system for producing green methanol from biomass gasification using magnesium-based solid-state hydrogen storage. By introducing a HT-TES (High-Temperature Thermal Energy Storage) 400, the system improves the temporal constraints on materials and heat, allowing green electricity, which is easily affected by the environment, to adapt to relatively stable chemical production. The oxygen generated intermittently from water electrolysis is first stored in an atmospheric / medium-pressure pure oxygen buffer tank 202, and then fed into the biomass gasifier 300 at an absolutely stable flow rate, replacing the air separation unit. The green hydrogen generated by electrolysis is buffered in the magnesium-based solid-state hydrogen storage device 402, and smoothly dehydrogenated when green electricity is unavailable, ensuring that the hydrogen-to-carbon ratio fed into the green methanol continuous synthesis tower 500 remains constant at the optimal feedstock ratio.

[0034] The system of this invention is equipped with a high-temperature molten salt thermal storage system operating at 250℃ to 450℃, serving as a heat storage tank for the entire plant, enabling on-demand heat storage and retrieval. Specifically: the 800-1000℃ crude syngas continuously discharged from the biomass gasifier 300 is continuously fed into the HT-TES with high-grade heat of 390-450℃ through a heat exchanger; the magnesium-based hydrogen storage intermittently feeds the HT-TES with reaction heat of 350℃ during hydrogen absorption. The HT-TES continuously supplies heat to the steam generator, ensuring that the gasifier obtains a constant flow rate of 200-300℃ high-temperature steam; when there is no wind or solar power and the magnesium-based hydrogen storage needs dehydrogenation, the HT-TES intermittently outputs a high-temperature heat source of 390℃ to the magnesium-based hydrogen storage tank to drive the dehydrogenation reaction.

[0035] In summary, this invention provides a magnesium-based solid-state hydrogen storage system for biomass gasification to produce green methanol. By coupling magnesium-based solid-state hydrogen storage with biomass gasification to produce green methanol, it offers certain environmental benefits and industrial applicability. By using agricultural and forestry waste biomass as a raw material and integrating wind and solar new energy / fluctuating green electricity, a wide-power water electrolysis hydrogen production device, a magnesium-based solid-state hydrogen storage device, and an HT-TES thermal energy dispatch module, the system improves the applicability of fluctuating green electricity to continuous chemical production conditions through the synergy of green electricity hydrogen production, hydrogen storage and voltage stabilization, biomass gasification, and methanol synthesis. This invention transforms agricultural and forestry waste into valuable resources, combining it with green electricity to produce zero-carbon / negative-carbon methanol, thus enhancing environmental friendliness. By using HT-TES to collect waste heat from synthesis gas and release heat from hydrogen storage, the entire plant achieves self-sufficiency in heat energy, reducing energy consumption from external heat sources. Based on atmospheric / medium-pressure pure oxygen buffer tanks and magnesium-based solid-state hydrogen storage devices, this invention achieves a stable supply of gas and heat, ensuring continuous operation of the gasification and synthesis processes. The wide-power electrolysis device is adapted to the fluctuating characteristics of green electricity, reducing waste and allowing for relatively precise control of the carbon-hydrogen ratio in methanol synthesis, improving product purity and yield, resulting in superior economic efficiency and engineering practicality.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Anyone skilled in the art can readily implement the present invention according to the description and above. Any modifications, alterations, or equivalent variations made using the technical content disclosed above are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A system for producing green methanol from biomass gasification using magnesium-based solid-state hydrogen storage, characterized in that, This includes agricultural and forestry waste biomass feedstock (100), wind and solar new energy / fluctuating green electricity (200), a wide-power water electrolysis hydrogen production unit (201), an atmospheric / medium-pressure pure oxygen buffer tank (202), a magnesium-based solid hydrogen storage unit (402), an HT-TES (400), a biomass gasification furnace (300), a high-temperature steam generator (401), a high-temperature syngas waste heat exchanger (301), a syngas scrubbing and purification unit (302), and a methanol synthesis unit; among which: The wind and solar new energy / fluctuating green electricity (200) is used to drive the wide-power water electrolysis hydrogen production device (201); the oxygen output end of the wide-power water electrolysis hydrogen production device (201) is connected to the biomass gasification furnace (300) via the atmospheric / medium pressure pure oxygen buffer tank (202), and the hydrogen output end is connected to the magnesium-based solid hydrogen storage device (402) and then to the methanol synthesis unit; the agricultural and forestry waste biomass raw material (100) is connected to the biomass gasification furnace (300); the crude syngas output end of the biomass gasification furnace (300) The gas is connected to the methanol synthesis unit after passing through the high-temperature syngas waste heat exchanger (301) and the syngas washing and purification unit (302). The heat release ends of the high-temperature syngas waste heat exchanger (301) and the magnesium-based solid hydrogen storage device (402) are both connected to the HT-TES (400). The heat release ends of the HT-TES (400) are respectively connected to the high-temperature steam generator (401) and the magnesium-based solid hydrogen storage device (402). The high-temperature steam generator (401) is connected to the biomass gasification furnace (300).

2. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 1, characterized in that, The wide-power water electrolysis hydrogen production device (201) is an intermittent operation device, driven by the wind and solar new energy / fluctuating green electricity (200) to produce hydrogen and oxygen intermittently.

3. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 1, characterized in that, The atmospheric / medium pressure pure oxygen buffer tank (202) is used to receive oxygen intermittently produced by the wide power water electrolysis hydrogen production device (201) and to continuously supply oxygen to the biomass gasifier (300) as a gasifying agent.

4. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 1, characterized in that, The magnesium-based solid hydrogen storage device (402) releases thermal energy at a first preset temperature to the HT-TES (400) during the hydrogen absorption stage, and during the dehydrogenation stage, the HT-TES (400) provides thermal energy at a second preset temperature to drive magnesium-based dehydrogenation.

5. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 4, characterized in that, The magnesium-based solid hydrogen storage device (402) dehydrogenates and releases green hydrogen, which is used to adjust the carbon-hydrogen ratio of the feed gas required for the methanol synthesis unit.

6. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 1, characterized in that, The HT-TES (400) is the plant's thermal energy dispatch center, used to store the sensible heat recovered by the high-temperature syngas waste heat exchanger (301) and the heat released during the hydrogen absorption stage of the magnesium-based solid hydrogen storage device (402), and to continuously supply heat to the high-temperature steam generator (401) and the magnesium-based solid hydrogen storage device (402).

7. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 1, characterized in that, The high-temperature steam generator (401) is continuously heated by HT-TES (400) and continuously supplies steam at a third preset temperature to the biomass gasifier (300).

8. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 1, characterized in that, The biomass gasifier (300) is used to receive oxygen supplied by agricultural and forestry waste biomass raw material (100) and atmospheric / medium pressure pure oxygen buffer tank (202) and water vapor supplied by high temperature water vapor generator (401), and continuously output crude syngas at a fourth preset temperature.

9. The system for biomass gasification to produce green methanol based on magnesium-based solid hydrogen storage according to claim 1, characterized in that, The methanol synthesis unit includes a green methanol continuous synthesis tower (500). The synthesis gas washing and purification unit (302) continuously supplies washed and purified synthesis gas to the green methanol continuous synthesis tower (500). The crude methanol produced by the green methanol continuous synthesis tower (500) is purified by distillation and then transported to the liquid methanol finished product storage and transportation tank (600) for storage and transportation.

10. A method for producing green methanol from biomass gasification using magnesium-based solid-state hydrogen storage, characterized in that, The system for producing green methanol from biomass gasification based on magnesium-based solid hydrogen storage as described in any one of claims 1-9 includes the following steps: S1. Using wind and solar new energy / fluctuating green electricity (200) to drive the wide power water electrolysis hydrogen production device (201) to operate intermittently, and electrolyze water to produce oxygen and green hydrogen; S2. Oxygen is transported to an atmospheric / medium pressure pure oxygen buffer tank (202) for buffering, and then oxygen is continuously supplied to a biomass gasifier (300); green hydrogen is transported to a magnesium-based solid hydrogen storage device (402) for hydrogen absorption and storage, and the heat energy released by the magnesium-based solid hydrogen storage device (402) during the hydrogen absorption process is charged into HT-TES (400). S3. HT-TES (400) is used to continuously heat the high-temperature steam generator (401), which generates steam and delivers it to the biomass gasifier (300); HT-TES (400) is used to provide the thermal energy required for dehydrogenation to the magnesium-based solid hydrogen storage device (402), which drives the magnesium-based solid hydrogen storage device (402) to dehydrogenate, and the green hydrogen released by dehydrogenation is delivered to the green methanol continuous synthesis tower (500). S4. Agricultural and forestry waste biomass raw materials (100) are continuously fed into the biomass gasifier (300) and continuously gasified with the supplied oxygen and water vapor in the biomass gasifier (300) to produce crude syngas. S5. The crude syngas is transported to the high-temperature syngas waste heat exchanger (301), where the sensible heat of the crude syngas is recovered and charged into HT-TES (400). The cooled crude syngas is then transported to the syngas washing and purification unit (302) to obtain washed and purified syngas, which is then transported to the green methanol continuous synthesis tower (500). S6. Green hydrogen and washed and purified syngas are continuously synthesized into methanol in a green methanol continuous synthesis tower (500). The crude methanol produced is purified by distillation and then transported to a liquid methanol finished product storage tank (600) for storage.

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