Hydrogen storage and discharge system for low saturated vapor pressure liquid hydrogen storage carrier

Abstract

The invention relates to the technical field of hydrogen storage and release, in particular to a hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier, which comprises a heat exchange unit, a feeding and discharging unit, a hydrogen storage unit, a hydrogen release unit and a separation unit, the heat exchange unit is connected with the hydrogen storage unit, the hydrogen desorption unit and the separation unit through pipelines and used for adjusting the temperature of materials in the units, and the feeding and discharging unit is connected with the hydrogen storage unit, the hydrogen desorption unit and the separation unit through pipelines and used for adjusting and controlling conveying of a hydrogen storage carrier and a hydrogen-rich carrier; according to the design scheme, the liquid organic hydrogen storage carrier with high saturated vapor pressure is selected, the hydrogen storage system with the low-pressure hydrogenation characteristic and the hydrogen desorption system with microwave heating serving as the only heat source are coupled, the higher energy utilization rate can be achieved, the high selectivity of the hydrogen desorption reaction process can be achieved, the separation and purification process is simplified, and the hydrogen desorption efficiency is improved. And high-purity hydrogen can be released at lower cost.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage and release technology, and in particular to a hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier. Background Technology

[0002] Hydrogen energy, as a clean, efficient, and abundant secondary energy source, has broad application prospects in transportation, energy storage, and industry. However, the large-scale application of hydrogen energy still faces significant challenges in storage and transportation. Against this backdrop, liquid organic hydrogen storage carrier technology has emerged. This technology achieves hydrogen storage and release through reversible hydrogenation / dehydrogenation reactions of unsaturated organic compounds (such as cyclic aromatic hydrocarbons). These carriers can exist in liquid form under near-room temperature and pressure conditions, possessing high volumetric hydrogen storage density and good safety characteristics. Furthermore, they can be transported using existing infrastructure, demonstrating strong engineering compatibility and application potential.

[0003] Despite this, the technology still faces several bottlenecks in practical system applications. First, the hydrogenation reaction typically requires high pressures of 3-5 MPa, leading to significant energy consumption for hydrogen compression. It also imposes stringent requirements on the reactor's pressure resistance and sealing performance, increasing system construction and maintenance costs. Second, during the dehydrogenation stage, the catalyst often generates alkane byproducts (such as methane and ethane) at concentrations exceeding 500 ppm. These byproducts, along with residual organic vapors, mix with the product hydrogen, posing a challenge to subsequent purification processes in removing multiple impurities. To meet the stringent requirements for hydrocarbon impurities in hydrogen for high-end applications such as fuel cells, complex multi-stage purification devices are necessary, further increasing system complexity and control difficulty, and hindering its large-scale development.

[0004] Microwave heating, as an emerging electrification technology, can selectively heat catalyst beds, featuring high energy utilization and the ability to eliminate cold zones in the bed, improve bed temperature distribution, and thus suppress side reactions. To simplify process operation and reduce separation costs, a new technology is proposed: using liquid organic hydrogen storage carriers with high saturated vapor pressure, and introducing low-pressure hydrogenation and microwave-heated dehydrogenation into the hydrogen storage and release system to overcome the difficulties encountered in the application of existing hydrogen storage and release systems. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the hydrogen storage and release systems for low saturated vapor pressure liquid hydrogen storage carriers, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier, which aims to solve the problems of high energy consumption, high requirements for reactor performance, system complexity, difficulty in control, high cost, and difficulty in maintenance of existing hydrogen storage and release systems.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier, the hydrogen storage and release system comprising a heat exchange unit and a feeding / discharging unit, a hydrogen storage unit, a hydrogen release unit, and a separation unit connected sequentially by pipelines. The heat exchange unit is connected to the hydrogen storage unit, the hydrogen release unit, and the separation unit by pipelines respectively to adjust the temperature of the material in each unit. The feeding / discharging unit is connected to the hydrogen storage unit, the hydrogen release unit, and the separation unit by pipelines respectively to regulate the transport of the hydrogen storage carrier and the hydrogen-rich carrier.

[0009] As a preferred embodiment of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to the present invention, the feeding and discharging unit includes a feeding module and a discharging module. The feeding module includes a carrier storage tank and a carrier delivery pump connected to the output end of the carrier storage tank. The discharging module includes a hydrogen-rich carrier storage tank and a hydrogen-rich carrier delivery pump connected to the output end of the hydrogen-rich carrier storage tank. The hydrogen storage carrier is introduced into the input end of the carrier storage tank.

[0010] As a preferred embodiment of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to the present invention, the hydrogen storage unit includes a hydrogenation reactor and a first gas-liquid separator. The input end of the hydrogenation reactor is connected to the output end of the carrier delivery pump via a pipeline, and its output end is connected to the input end of the first gas-liquid separator via a pipeline. The hydrogenation reactor is equipped with a heat exchange coil, and its inlet is connected to a hydrogen source. The gas phase output end of the first gas-liquid separator discharges purge gas, and its liquid phase output pipe is connected to the input end of the hydrogen-rich carrier storage tank via a pipeline.

[0011] As a preferred embodiment of the hydrogen storage and release system for a low-saturation vapor pressure liquid hydrogen storage carrier according to the present invention, wherein: the hydrogen release unit includes a dehydrogenation reactor, and the dehydrogenation reactor is a microwave-heated fixed-bed dehydrogenation reactor.

[0012] As a preferred embodiment of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to the present invention, the separation unit includes a second gas-liquid separator, a pre-compressor buffer tank, a circulating compressor, a post-compressor buffer tank, an adsorption column, and a carrier collection tank. The gas phase output end of the second gas-liquid separator is connected to the input end of the pre-compressor buffer tank via a pipeline, and its liquid phase output end is connected to the input end of the carrier collection tank via a pipeline. The gas phase output end of the pre-compressor buffer tank is sequentially connected to the circulating compressor and the post-compressor buffer tank via pipelines, and its liquid phase output end is connected to the input end of the carrier collection tank via a pipeline. The output end of the post-compressor buffer tank has three branches: the first branch outputs circulating hydrogen, the second branch outputs purge gas, and the third branch is connected to the adsorption column.

[0013] As a preferred embodiment of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to the present invention, wherein: the heat exchange unit includes an air cooler, an inlet and outlet heat exchanger, and a condenser; the air cooler is connected to the pipeline between the output end of the hydrogenation reactor and the input end of the first gas-liquid separator; the inlet and outlet heat exchanger is located at the output end of the hydrogen-rich carrier delivery pump and is connected to the dehydrogenation reactor and the second gas-liquid separator via pipeline; the condenser is connected to the pipeline between the gas phase output end of the second gas-liquid separator and the input end of the compressor pre-buffer tank.

[0014] As a preferred embodiment of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to the present invention, wherein: the inlet and outlet heat exchangers are connected to the output end of the hydrogen-rich carrier delivery pump through a first inlet, connected to the input end of the dehydrogenation reactor through a first output, connected to the output end of the dehydrogenation reactor through a second inlet, and connected to the input end of the second gas-liquid separator through a second output.

[0015] As a preferred embodiment of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier described in this invention, wherein: the circulating hydrogen output from the first branch of the compressor's rear buffer tank is connected to the first inlet of the inlet and outlet heat exchanger via a pipeline.

[0016] As a preferred embodiment of the hydrogen storage and release system for a low-saturation vapor pressure liquid hydrogen storage carrier described in this invention, it further includes a hydrogen utilization device connected to the output end of the adsorption column to receive and utilize pure hydrogen products.

[0017] As a preferred embodiment of the hydrogen storage and release system for a low-saturation vapor pressure liquid hydrogen storage carrier according to the present invention, the carrier output from the carrier collection tank is circulated into the carrier storage tank.

[0018] The beneficial effects of this invention are: This invention integrates low-pressure hydrogenation with microwave catalytic dehydrogenation technology, proposing an integrated solution to address bottlenecks such as high hydrogenation pressure, poor dehydrogenation selectivity, and complex purification processes. The system employs a low-pressure hydrogenation process, significantly reducing the energy consumption for hydrogen compression and the pressure requirements of the equipment. Microwave heating of the dehydrogenation reactor achieves efficient and uniform catalytic dehydrogenation, effectively suppressing the formation of alkane byproducts, improving hydrogen purity from the source, and simplifying subsequent purification processes.

[0019] Furthermore, this system has advantages such as low energy consumption, high hydrogen purity, simple operation, and good carrier cycle stability, making it suitable for distributed hydrogen energy storage and release scenarios and providing a reliable path for the large-scale application of liquid organic hydrogen storage technology. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a system framework diagram of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to the present invention.

[0021] Figure 2 This is an overall structural diagram of the hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to the present invention.

[0022] Figure 3 This is a schematic diagram of the process flow for the hydrogen storage and release system of the low saturated vapor pressure liquid hydrogen storage carrier of the present invention. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0027] Reference Figures 1-3 According to one embodiment of the present invention, a hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier is provided. This hydrogen storage and release system is used for storing and releasing hydrogen from a low-saturated vapor pressure liquid organic hydrogen storage carrier. The system includes a heat exchange unit 100 and a feed / discharge unit 200, a hydrogen storage unit 300, a hydrogen release unit 400, and a separation unit 500 connected in sequence by pipelines. The heat exchange unit 100 is connected to the hydrogen storage unit 300, the hydrogen release unit 400, and the separation unit 500 respectively via pipelines. The feeding and discharging unit 200 is used to adjust the temperature of materials in each unit; it is connected to the hydrogen storage unit 300, the hydrogen release unit 400, and the separation unit 500 through pipelines, respectively, and is used to regulate the transportation of hydrogen storage carrier and hydrogen-rich carrier; the hydrogen storage unit 300 is used for the hydrogenation reaction of the hydrogen storage carrier to realize hydrogen storage; the hydrogen release unit 400 is used for the dehydrogenation reaction of the hydrogen-rich carrier to realize hydrogen release; the separation unit 500 is used to separate the gas and liquid of the hydrogen release reaction products and purify them to obtain pure hydrogen for use in hydrogen-using equipment.

[0028] Specifically, the infeed / outfeed unit 200 includes an infeed module 201 and an outfeed module 202. The infeed module 201 is used for conveying the hydrogen storage carrier to the hydrogen storage unit 300 for hydrogenation reaction. It specifically includes a carrier storage tank 201a and a carrier transfer pump 201b connected to the output end of the carrier storage tank 201a. The infeed end of the carrier storage tank 201a is connected to the hydrogen storage carrier. The outfeed module 202 is used for conveying the hydrogen-rich carrier to the hydrogen release unit 400 for hydrogen release reaction. It specifically includes a hydrogen-rich carrier storage tank 202a and a hydrogen-rich carrier transfer pump 202b connected to the output end of the hydrogen-rich carrier storage tank 202a.

[0029] It should be noted that the low saturated vapor pressure liquid hydrogen storage carrier in the carrier storage tank 201a is preferably one or more of benzyltoluene, dibenzyltoluene, dimethylpyridine, naphthalene, methylnaphthalene, and N-ethylcarbazole.

[0030] Furthermore, the hydrogen storage unit 300 includes a hydrogenation reactor 301 and a first gas-liquid separator 302. The input end of the hydrogenation reactor 301 is connected to the output end of the carrier delivery pump 201b via a pipeline, and its output end is connected to the input end of the first gas-liquid separator 302 via a pipeline. The hydrogenation reactor 301 is a slurry bed type hydrogenation reactor, which is equipped with a heat exchange coil P inside, using the circulating heat transfer oil in the coil to remove the heat released during the reaction. The input port of the hydrogenation reactor 301 is connected to a hydrogen source H. The gas phase output end of the first gas-liquid separator 302 discharges purge gas C, which is used to control the pressure of the gas pipeline system. Its liquid phase output end is connected to the input end of the hydrogen-rich carrier storage tank 202a via a pipeline, and the hydrogen-rich carrier is temporarily stored in the hydrogen-rich carrier storage tank 202a.

[0031] Preferably, the hydrogen source H is bubbled in from the bottom of the hydrogenation reactor 301, the operating temperature of the hydrogenation reactor 301 is 150~200℃, and the reaction pressure is 1.5~2.0MPa; the catalyst in the hydrogenation reactor 301 can be a NiCeZr catalyst.

[0032] Furthermore, the hydrogen release unit 400 mainly includes a dehydrogenation reactor 401. Specifically, the dehydrogenation reactor 401 is a fixed-bed dehydrogenation reactor heated by microwave. Preferably, the dehydrogenation reactor 401 has one or more microwave sources, which are installed in the middle of the outer shell of the dehydrogenation reactor 401 and evenly distributed circumferentially. Each microwave source includes a microwave generator and a waveguide, preferably a BJ26 rectangular waveguide, and the microwave frequency is preferably 2.45 GHz. The reactor center is a single-tube reaction tube, and the catalyst is packed in the reaction tube. Furthermore, a thermocouple is inserted through a temperature detection hole set at the top of the reactor to monitor the reaction temperature inside the reactor, so that the output power of the microwave source can be automatically adjusted according to the temperature change. As a preferred option, the microwave-heated fixed-bed dehydrogenation reactor operates at a temperature of 250~350℃ and a reaction pressure of 0.1~0.2MPa. The catalyst in the microwave-heated fixed-bed dehydrogenation reactor is a uniform mixture of Pt / Al2O3 catalyst and silicon carbide, with a mass mixing ratio of 1:1~1:5. The feed to the dehydrogenation reactor is a mixture of hydrogen gas and hydrogen-rich carrier vapor, and the hydrogen-to-oil ratio of hydrogen gas to hydrogen-rich carrier is in the range of 0~2.

[0033] The separation unit 500 includes a second gas-liquid separator 501, a pre-compressor buffer tank 502, a circulating compressor 503, a post-compressor buffer tank 504, an adsorption column 505, and a carrier collection tank 506. Specifically, the second gas-liquid separator 501 is used for gas-liquid separation of hydrogen products. Its gas phase output is connected to the input of the pre-compressor buffer tank 502 via a pipeline, and its liquid phase output is connected to the input of the carrier collection tank 506 via a pipeline. The gas phase output of the pre-compressor buffer tank 502 is connected sequentially to the circulating compressor 503 and the post-compressor buffer tank 504 via pipelines, and its liquid phase output is connected to the input of the carrier collection tank 506 via a pipeline. The hydrogen storage carrier output from the carrier collection tank 506 is circulated into the carrier storage tank 201a for reuse.

[0034] The compressor's post-buffer tank 504 outputs three branches: the first branch outputs recirculated hydrogen, the second branch outputs purge gas, and the third branch outputs pure hydrogen product, which is connected to the adsorption column 505 to further remove organic carrier vapor before being output for reuse. It should be noted that the recirculated hydrogen output from the first branch is connected to the first inlet of the inlet / outlet heat exchanger 102 via a pipeline to recycle the raw material and improve utilization efficiency.

[0035] Preferably, the output pressure of the circulating compressor 503 is 0.2~1MPa; the adsorption material packed in the adsorption column 505 is one or more of activated carbon, alumina, and molecular sieve adsorbent, and the working pressure of the adsorption column 505 is 0.2~1MPa.

[0036] The heat exchange unit 100 includes an air cooler 101, an inlet / outlet heat exchanger 102, and a condenser 103. Specifically, the air cooler 101 is connected to the pipeline between the output end of the hydrogenation reactor 301 and the input end of the first gas-liquid separator 302, and is used to cool the output of the hydrogenation reactor 301. The inlet / outlet heat exchanger 102 is located at the output end of the hydrogen-rich carrier transfer pump 202b and is connected to the dehydrogenation reactor 401 and the second gas-liquid separator 501 through pipelines. The inlet / outlet heat exchanger 102 is connected to the output end of the hydrogen-rich carrier transfer pump 202b through a first input port, to the input end of the dehydrogenation reactor 401 through a first output port, to the output end of the dehydrogenation reactor 401 through a second input port, and to the input end of the second gas-liquid separator 501 through a second output port. Here, the cold stream from the inlet and outlet heat exchanger 102 serves as the inlet material of the dehydrogenation reactor 401, and the hot stream serves as the outlet material of the dehydrogenation reactor 401, so as to realize the recovery and reuse of reaction energy; the condenser 103 is connected to the pipeline between the gas phase output end of the second gas-liquid separator 501 and the input end of the compressor front buffer tank 502, and is used to cool the hydrogen products separated by the second gas-liquid separator 501.

[0037] Furthermore, the hydrogen storage and dispensing system of this solution may also include a hydrogen utilization device 600, which is connected to the output end of the adsorption column 505 to receive and utilize pure hydrogen products. Preferably, the hydrogen utilization device 600 is a hydrogen fuel cell 601, which is used to directly output electrical energy to supply power to electrical equipment.

[0038] Example

[0039] Reference Figures 1-3 In one embodiment of the present invention, a hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier is used to conduct hydrogen storage and release experiments.

[0040] In this embodiment, the low-saturated vapor pressure liquid hydrogen storage carrier used is benzyltoluene.

[0041] Furthermore, the dehydrogenation reactor 401 is a microwave-heated fixed-bed dehydrogenation reactor with a pentahedral hollow column structure and five microwave sources evenly distributed circumferentially. The reactor is filled with a uniformly mixed Pt / Al2O3 catalyst and silicon carbide in a mass ratio of 1:1.

[0042] Furthermore, the adsorption material packed in the adsorption column 505 is commercially available activated carbon.

[0043] Based on the hydrogen storage and release system in the embodiments, the hydrogen storage process and the hydrogen release process are described in detail.

[0044] The principle of the hydrogen storage process is as follows: The hydrogen storage carrier, benzyltoluene, is transported from carrier storage tank 201a to the inlet of hydrogenation reactor 301 by carrier transfer pump 201b. Fresh hydrogen gas is bubbled into hydrogenation reactor 301 from the bottom by hydrogen source H. The heat of reaction is removed by circulating heat transfer oil in heat exchange coil P. After the reaction, the liquid overflows into air cooler 101 and is cooled to 60°C. It then enters the first gas-liquid separator 302. The liquid phase in the first gas-liquid separator 302 is the hydrogenation product, namely the hydrogen-rich carrier, dodecahydrobenzyltoluene, which enters hydrogen-rich carrier storage tank 202a; the gas phase is the purge gas controlled by the system pressure. The hydrogenation reaction temperature is 180°C, the reaction pressure is 1.6 MPa, the molar flow ratio of hydrogen to benzyltoluene feed is 6, and the volume residence time of benzyltoluene is 2 hours, achieving a benzyltoluene hydrogenation conversion rate of greater than 90%.

[0045] The principle of the hydrogen release process is as follows: the hydrogen-rich carrier, dodecahydrobenzyltoluene, is transported from the hydrogen-rich carrier storage tank 202a by the hydrogen-rich carrier transfer pump 202b, mixed with circulating hydrogen, and then enters the inlet and outlet heat exchanger 102 for heat recovery. After preheating, it enters the dehydrogenation reactor 401. The microwave reactor has a microwave input power of 2.5 kW, a dehydrogenation reaction temperature of 300℃, a reaction pressure of 0.1 MPa, a molar flow ratio of circulating hydrogen to dodecahydrobenzyltoluene feed of 0.88, and a mass hourly space velocity (HSV) of dodecahydrobenzyltoluene in the reactor of 6 h⁻¹. -1It achieves a dehydrogenation conversion rate of more than 99% for dodecylbenzyltoluene, a methane byproduct of less than 100 ppm, and a hydrogen release rate of more than 2 gH2 / min.

[0046] The product gas from the outlet of the dehydrogenation reactor 401 enters the inlet and outlet heat exchanger 102 for initial cooling, and then enters the second gas-liquid separator 501. The gaseous outlet stream from the second gas-liquid separator 501 enters the condenser 103 for cooling to 10°C, and then enters the compressor pre-buffer tank 502. The gaseous outlet stream from the compressor pre-buffer tank 502 enters the circulating compressor 503 for pressurization to 0.2 MPa, and then enters the compressor post-buffer tank 504. The first branch of the compressor post-buffer tank 504 is the inlet of the circulating hydrogen into the cold stream inlet of the inlet and outlet heat exchanger 102, i.e., the first input port; the second branch is the purge gas used to control the system pressure; and the third branch is the product pure hydrogen, with a hydrogen purity greater than 99.99% and a hydrogen yield greater than 99%. For the purpose of protecting the hydrogen-using equipment 600, the pure hydrogen product is further deodorized by the adsorption column 505 to remove organic carrier vapor, and then enters the hydrogen fuel cell (in the hydrogen-using equipment 600) to generate electricity to supply other electrical equipment. The liquid phase outlet streams from the second gas-liquid separator 501 and the compressor front buffer tank 502 enter the carrier collection tank 506, and the carrier returns from the carrier collection tank 506 to the carrier storage tank 201a.

[0047] In summary, this proposal presents a hydrogen storage and release system for low-saturated vapor pressure liquid hydrogen storage carriers. This system integrates low-pressure hydrogenation and microwave catalytic dehydrogenation, allowing for independent operation of the hydrogen storage and release processes, or coordinated operation to achieve continuous recycling of the carrier. The system significantly reduces hydrogen compression energy consumption and equipment pressure requirements through low-pressure hydrogenation. The microwave-heated dehydrogenation reactor effectively overcomes the problems of uneven temperature distribution and low thermal efficiency associated with traditional heat conduction methods, improving the dehydrogenation reaction rate and selectivity while significantly suppressing side reactions. While ensuring high purity of the output hydrogen, the system greatly simplifies the purification process, reduces equipment costs and operational complexity, and improves hydrogen yield and the cycling stability of the hydrogen storage carrier. This system boasts advantages such as low energy consumption, compact structure, and strong controllability, making it suitable for distributed hydrogen storage and mobile hydrogen supply scenarios, and providing a reliable path for the practical application and large-scale promotion of liquid organic hydrogen storage technology.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier, characterized in that: include, A heat exchange unit (100) is connected in sequence to an inlet / outlet unit (200), a hydrogen storage unit (300), a hydrogen release unit (400), and a separation unit (500) via pipelines. The heat exchange unit (100) is connected to the hydrogen storage unit (300), the hydrogen release unit (400), and the separation unit (500) via pipelines to adjust the temperature of the material in each unit. The inlet / outlet unit (200) is connected to the hydrogen storage unit (300), the hydrogen release unit (400), and the separation unit (500) via pipelines to regulate the transport of the hydrogen storage carrier and the hydrogen-rich carrier.

2. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to claim 1, characterized in that: The feeding and discharging unit (200) includes a feeding module (201) and a discharging module (202). The feeding module (201) includes a carrier storage tank (201a) and a carrier transfer pump (201b) connected to the output end of the carrier storage tank (201a). The discharging module (202) includes a hydrogen-rich carrier storage tank (202a) and a hydrogen-rich carrier transfer pump (202b) connected to the output end of the hydrogen-rich carrier storage tank (202a). The hydrogen storage carrier is introduced into the input end of the carrier storage tank (201a).

3. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to claim 2, characterized in that: The hydrogen storage unit (300) includes a hydrogenation reactor (301) and a first gas-liquid separator (302). The input end of the hydrogenation reactor (301) is connected to the output end of the carrier delivery pump (201b) through a pipeline, and its output end is connected to the input end of the first gas-liquid separator (302) through a pipeline. The hydrogenation reactor (301) is equipped with a heat exchange coil (P), and its inlet is connected to a hydrogen source (H). The gas phase output end of the first gas-liquid separator (302) discharges purge gas, and its liquid phase output pipe is connected to the input end of the hydrogen-rich carrier storage tank (202a) through a pipeline.

4. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to claim 3, characterized in that: The hydrogen release unit (400) includes a dehydrogenation reactor (401), which is a fixed-bed dehydrogenation reactor heated by microwave.

5. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to claim 4, characterized in that: The separation unit (500) includes a second gas-liquid separator (501), a compressor pre-buffer tank (502), a circulating compressor (503), a compressor post-buffer tank (504), an adsorption column (505), and a carrier collection tank (506). The gas phase output end of the second gas-liquid separator (501) is connected to the input end of the compressor front buffer tank (502) through a pipeline, and its liquid phase output end is connected to the input end of the carrier collection tank (506) through a pipeline. The gas phase output end of the compressor front buffer tank (502) is connected to the circulating compressor (503) and the compressor rear buffer tank (504) in sequence through pipelines, and its liquid phase output end is connected to the input end of the carrier collection tank (506) through pipelines. The compressor's rear buffer tank (504) has three output branches: the first branch outputs circulating hydrogen, the second branch outputs purge gas, and the third branch is connected to the adsorption column (505).

6. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to claim 5, characterized in that: The heat exchange unit (100) includes an air cooler (101), an inlet and outlet heat exchanger (102), and a condenser (103). The air cooler (101) is connected to the pipeline between the output end of the hydrogenation reactor (301) and the input end of the first gas-liquid separator (302); The inlet and outlet heat exchanger (102) is located at the output end of the hydrogen-rich carrier transfer pump (202b) and is connected to the dehydrogenation reactor (401) and the second gas-liquid separator (501) via pipelines. The condenser (103) is connected to the pipeline between the gas phase output end of the second gas-liquid separator (501) and the input end of the compressor front buffer tank (502).

7. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to claim 6, characterized in that: The inlet and outlet heat exchanger (102) is connected to the output end of the hydrogen-rich carrier transfer pump (202b) through the first inlet port, to the input end of the dehydrogenation reactor (401) through the first output port, to the output end of the dehydrogenation reactor (401) through the second inlet port, and to the input end of the second gas-liquid separator (501) through the second output port.

8. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to claim 6 or 7, characterized in that: The circulating hydrogen output from the first branch of the compressor rear buffer tank (504) is connected to the first inlet of the inlet and outlet heat exchanger (102) through a pipeline.

9. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to any one of claims 5 to 7, characterized in that: It also includes a hydrogen-using device (600) connected to the output end of the adsorption column (505) to receive and utilize pure hydrogen products.

10. The hydrogen storage and release system for a low-saturated vapor pressure liquid hydrogen storage carrier according to any one of claims 5 to 7, characterized in that: The carrier output from the carrier collection tank (506) is cyclically fed into the carrier storage tank (201a).

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