Organic liquid hydrogen storage, groove type photo-thermal and methanol synthesis integrated device

Abstract

The invention discloses an organic liquid hydrogen storage, groove type photo-thermal and methanol synthesis integrated device, and belongs to the technical field of liquid hydrogen storage. The device comprises a groove type photo-thermal subsystem, an organic liquid hydrogen storage subsystem and a hydrogen synthesis methanol and methanol hydrogen production subsystem, wherein the groove type photo-thermal subsystem comprises a heat conduction oil storage tank, the heat conduction oil storage tank is provided with two oil outlet pipelines, and the two oil outlet pipelines are respectively connected with the organic liquid hydrogen storage subsystem and the hydrogen synthesis methanol and methanol hydrogen production subsystem. According to the invention, heat storage type trough photo-thermal which can stably and continuously provide proper temperature is selected as a clean and green external heat source to provide heat for dehydrogenation and hydrogenation of organic liquid, so that a series of problems of mutual influence of electricity and hydrogen, mismatching of temperature, mismatching of starting time, mismatching of non-standard working conditions, intermittent fluctuation and the like are eliminated; the flexibility and the stability when the device deals with demand changes are enhanced, and energy efficiency optimization is achieved through flexible arrangement of heat consumption and hydrogen storage.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid hydrogen storage, and particularly relates to an integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis. Background Art

[0002] Hydrogenation and dehydrogenation of organic liquid hydrogen storage usually require an external heat source at 150 - 250°C. Most of the existing technical solutions couple organic liquid hydrogen storage with fuel cells, using the waste heat generated during the operation of the fuel cells to provide an external heat source for hydrogenation and dehydrogenation of organic liquid hydrogen storage; at the same time, using the hydrogen from organic liquid hydrogen storage to provide fuel for the fuel cells. However, such technical solutions have 4 disadvantages:

[0003] First, when organic liquid dehydrogenates, hydrogen can be generated and supplied to the fuel cell, and the waste heat of the fuel cell is then used for dehydrogenation, achieving coupling to a certain extent. However, in the scenario of hydrogen - electricity complementarity, when hydrogen is generally insufficient and electricity is in surplus, part of the hydrogen generated by organic liquid dehydrogenation is consumed by the fuel cell for power generation, and at this time, electricity is not needed, resulting in resource waste. Second, when organic liquid hydrogenates, external hydrogen and an external heat source are required. At this time, the fuel cell also needs external hydrogen to generate electricity, which can meet the scenario demand of surplus hydrogen and insufficient electricity, but part of the hydrogen to be stored is consumed, and the matching degree between the two is average. Third, the startup time, non - standard working conditions, etc. of the organic liquid dehydrogenation and hydrogenation reactors and the fuel cell are not considered. For example, after the organic liquid dehydrogenation reaches a certain flow rate, the fuel cell can start, and the fuel cell startup also takes time, and it takes more time to generate waste heat. Before that, organic liquid dehydrogenation still needs to rely on other external heat sources such as electric heating, resulting in deteriorated matching and reduced efficiency. When the organic liquid dehydrogenation, hydrogenation, or the fuel cell operates under non - standard working conditions, it will also deviate from the original matching, causing problems such as the need for other external heat sources or external hydrogen. Fourth, the waste heat temperature of commonly used fuel cells generally does not match the 150 - 250°C required for organic liquid dehydrogenation and hydrogenation. The waste heat temperature of a solid oxide fuel cell (SOFC) can reach 600°C, far exceeding the dehydrogenation and hydrogenation required temperature, resulting in waste of high - grade thermal energy; while the waste heat of an alkaline fuel cell (AFC) and a proton exchange membrane fuel cell (PEMFC) is only 50 - 100°C, which cannot meet the temperature requirements for organic liquid dehydrogenation and hydrogenation, and a higher - temperature external heat source is still needed.

[0004] There are multiple patents adopting such technical solutions. Some of these patents have been improved by adding devices or adjusting processes, but they have not solved the above four aspects of drawbacks and problems. For example, in the patents with publication numbers CN115441013A and CN116247239A, a comprehensive hydrogen storage and supply energy system based on organic liquid hydrogen storage and an operation method thereof, and a high-efficiency, safe and long-duration hydrogen fuel cell integrated energy system are respectively proposed. Among them, in CN115441013A, a solid oxide fuel cell is combined with organic liquid hydrogen storage, and the above-mentioned drawbacks still exist. On this basis, CN116247239A adds devices such as an electrolytic cell for hydrogen production, hydrogen storage, a heat pump, and heat storage. Some of the above-mentioned drawbacks are alleviated, but some problems become more serious due to the higher complexity of the system. In the patents with publication numbers CN115111055A and CN109850846B, an organic liquid dehydrogenation and hydrogen internal combustion engine coupling system and a self-heating organic liquid dehydrogenation hydrogen supply system and its application are respectively proposed, both of which use a hydrogen gas or hydrogen burner instead of a fuel cell, and the response time is faster. Drawback 1 and Drawback 2 still exist, Drawback 3 is alleviated, but Drawback 4, the waste of high-temperature heat, becomes more serious, and the energy efficiency of the combustion device is lower than that of the fuel cell. In the patent with publication number CN113540511A, an organic liquid integrated energy system with efficient heat recovery is proposed. This solution combines organic liquid hydrogen storage with a fuel cell and an absorption heat pump, alleviating Drawback 1 in the dehydrogenation process and Drawback 2 in the hydrogenation process, and alleviating Drawback 4 of temperature mismatch. However, Drawback 3, the start-up time and non-standard operating conditions, becomes more serious due to the more complex system. In addition, this solution also brings new drawbacks and problems. For example, when the power generation of the fuel cell is insufficient, external power is required to drive the absorption heat pump, and this external power could have been directly used for hydrogen production, so it does not conform to the original meaning of hydrogen storage.

[0005] In terms of other technical solutions, the external heat source for organic liquid dehydrogenation and hydrogenation usually adopts methods such as electric heating, consuming high-quality electric energy, and not utilizing solar thermal energy, especially the trough solar thermal energy with temperature matching as the external heat source. Most of the other technical solutions related to organic liquid hydrogen storage also adopt a single route of organic liquid hydrogen storage and do not use chemical routes such as conversion to ammonia and methanol for storage. Summary of the Invention

[0006] In view of the above problems, the present invention proposes an integrated device for organic liquid hydrogen storage, trough solar thermal energy, and methanol synthesis. The device includes a trough solar thermal subsystem, an organic liquid hydrogen storage subsystem, and a hydrogen synthesis methanol and methanol hydrogen production subsystem;

[0007] Among them, the trough solar thermal subsystem includes a heat transfer oil storage tank. The heat transfer oil storage tank is provided with two oil outlet pipelines, and the two oil outlet pipelines are respectively connected to the organic liquid hydrogen storage subsystem and the hydrogen synthesis methanol and methanol hydrogen production subsystem.

[0008] Furthermore, the trough solar thermal subsystem further includes a support, a reflector, and a heat collecting pipe;

[0009] The reflector is installed on the support. A heat transfer oil storage tank is arranged on one side of the support close to the organic liquid hydrogen storage subsystem. The inlet end of the heat transfer oil storage tank is connected to the heat collecting pipe. The reflector uses a linear parabolic mirror surface reflection to focus sunlight on the heat collecting pipe to heat the working medium for power generation.

[0010] Furthermore, the temperature of the heat transfer oil in the heat transfer oil storage tank is 200 - 350 °C.

[0011] Furthermore, the organic liquid hydrogen storage subsystem includes:

[0012] an organic liquid storage tank and a first heat exchanger supporting the organic liquid storage tank;

[0013] an organic hydrogen storage liquid storage tank and a second heat exchanger supporting the organic hydrogen storage liquid storage tank;

[0014] a hydrogenation reactor connected to the first heat exchanger and a dehydrogenation reactor connected to the second heat exchanger; the outlet end of the hydrogenation reactor is connected to the inlet end of the organic hydrogen storage liquid storage tank, and the outlet end of the dehydrogenation reactor is connected to the organic liquid storage tank;

[0015] and a first valve arranged between the organic liquid storage tank and the first heat exchanger and a second valve arranged between the organic hydrogen storage liquid storage tank and the second heat exchanger.

[0016] Furthermore, the first heat exchanger is provided with two outlet ends and two inlet ends;

[0017] One of the outlet ends of the first heat exchanger is connected to the inlet end of the hydrogenation reactor, and the other outlet end is connected to the inlet end of the second heat exchanger;

[0018] One of the inlet ends of the first heat exchanger is connected to the liquid outlet pipeline of the organic liquid storage tank, and the other inlet end is connected to the oil outlet pipeline of the heat transfer oil storage tank. The first valve is arranged on the liquid outlet pipeline of the organic liquid storage tank.

[0019] Furthermore, the second heat exchanger is provided with two outlet ends and two inlet ends;

[0020] One of the outlet ends of the second heat exchanger is connected to the inlet end of the dehydrogenation reactor, and the other outlet end is connected to the heat transfer oil storage tank;

[0021] One inlet end of the second heat exchanger is connected to the liquid outlet pipeline of the organic hydrogen storage liquid storage tank, the second valve is arranged on the liquid outlet pipeline of the organic hydrogen storage liquid storage tank, and the other inlet end is connected to one outlet end of the first heat exchanger.

[0022] Furthermore, the hydrogen synthesis of methanol and methanol-to-hydrogen subsystem includes:

[0023] A methanol synthesis reactor and a third heat exchanger supporting the methanol reactor;

[0024] A methanol-to-hydrogen reactor and a fourth heat exchanger supporting the methanol-to-hydrogen reactor;

[0025] And a third valve arranged in front of the inlet end of the third heat exchanger and a fourth valve arranged in front of the inlet end of the fourth heat exchanger.

[0026] Furthermore, the third heat exchanger is provided with two outlet ends and two inlet ends;

[0027] One outlet end of the third heat exchanger is connected to the methanol synthesis reactor, and the other outlet end is connected to the inlet end of the fourth heat exchanger;

[0028] One inlet end of the third heat exchanger is connected to the oil outlet pipeline of the heat transfer oil storage tank, and the other inlet end is used for introducing carbon dioxide and hydrogen, and the third valve is arranged in front of the inlet end for introducing carbon dioxide and hydrogen.

[0029] Furthermore, the fourth heat exchanger is provided with two inlet ends and two outlet ends;

[0030] One outlet end of the fourth heat exchanger is connected to the methanol-to-hydrogen reactor, and the other outlet end is connected to the heat transfer oil storage tank;

[0031] One inlet end of the fourth heat exchanger is connected to the outlet end of the third heat exchanger, and the other water outlet end is used for introducing water, and the fourth valve is arranged in front of the inlet end for introducing water.

[0032] Furthermore, the hydrogen synthesis of methanol and methanol-to-hydrogen subsystem further includes a methanol storage tank;

[0033] The methanol storage tank is connected to the outlet end of the methanol synthesis reactor, and the outlet end of the methanol storage tank is connected to the fourth heat exchanger.

[0034] Advantages of the present invention:

[0035] The integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis proposed by the present invention breaks the combination of waste heat dehydrogenation and hydrogenation of hydrogen fuel cells and organic liquid hydrogen storage with mismatched heat source temperatures. Instead, a heat storage type trough solar thermal power generation that can stably and continuously provide an appropriate temperature is selected as a clean and green external heat source to provide heat for the dehydrogenation and hydrogenation of organic liquids, eliminating a series of problems such as the mutual influence between electricity and hydrogen, temperature mismatch, start-up time mismatch, off-standard working condition mismatch, and intermittent fluctuations. Moreover, starting from the principle of temperature matching required for the reaction, the present invention selects hydrogen synthesis of methanol and methanol reforming for hydrogen production as another channel for heat utilization of trough solar thermal power generation and another channel for hydrogen storage, strengthening the flexibility and stability of the present invention in response to demand changes, and optimizing the energy efficiency through flexible arrangement of heat utilization and hydrogen storage. At the same time, the integrated device proposed by the present invention is simple and efficient, realizing the coordinated utilization of two channels of heat sources and the coordinated storage of two channels of hydrogen energy. It has good expandability, and the temperature can adapt to common organic liquid hydrogen storage. Subsequently, it can also be connected to electrolyzers, fuel cells, heat pumps, chemical processes, etc. to further expand its functions and application scenarios, with great practical application capabilities.

[0036] Other features and advantages of the present invention will be described in the following specification, and in part, will be obvious from the specification, or can be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 The connection diagram of an integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis proposed by the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0040] The present invention provides an integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis, which uses the trough solar thermal power generation of a supporting storage tank to provide an external heat source with temperature matching and stable supply for the dehydrogenation, hydrogenation of organic liquids, and the two-way conversion of hydrogen and methanol, realizing the dual-channel utilization of the heat source and the dual-channel storage of hydrogen energy. The device mainly includes a trough solar thermal subsystem, an organic liquid hydrogen storage subsystem, and a hydrogen synthesis methanol and methanol-to-hydrogen subsystem.

[0041] As Figure 1 shown, among them, the trough solar thermal subsystem consists of a support, a reflector, a heat collecting pipe, and a heat transfer oil storage tank. The reflector is installed on the support, and a heat transfer oil storage tank is arranged on one side of the support close to the organic liquid hydrogen storage subsystem. The inlet end of the heat transfer oil storage tank is connected to the heat collecting pipe. The reflector uses a linear parabolic mirror surface to reflect sunlight and focus it on the heat collecting pipe to heat the working medium for power generation. The mirror surface of the reflector uses an automatic tracking system to track sunlight. In the present invention, the temperature of the heat transfer oil in the heat transfer oil storage tank is 200 - 350 °C, which can store heat to reduce intermittency and be used for night power generation.

[0042] The organic liquid hydrogen storage subsystem includes an organic liquid storage tank and its supporting first heat exchanger, an organic hydrogen storage liquid storage tank and its supporting second heat exchanger, a hydrogenation reactor, a dehydrogenation reactor, pumps, valves, etc. The organic liquid storage tank is connected to the first heat exchanger through an outlet pipeline. The outlet end of the first heat exchanger is connected to the hydrogenation reactor, and a first valve is arranged on the outlet pipeline connecting the organic liquid storage tank and the first heat exchanger. The organic hydrogen storage liquid storage tank is connected to the second heat exchanger through an outlet pipeline. The outlet end of the second heat exchanger is connected to the dehydrogenation reactor, and a second valve is arranged on the outlet pipeline connecting the organic hydrogen storage liquid storage tank and the second heat exchanger. The heat transfer oil storage tank is provided with two outlet pipelines. One outlet pipeline is connected to the first heat exchanger to transport heat transfer oil to the first heat exchanger, and the other outlet pipeline is connected to the third heat exchanger to transport heat transfer oil to the third heat exchanger. The outlet end of the hydrogenation reactor is connected to the inlet end of the organic hydrogen storage liquid storage tank, and the outlet end of the dehydrogenation reactor is connected to the inlet end of the organic liquid storage tank.

[0043] In the present invention, liquid organic substances such as olefins, alkynes, or aromatic hydrocarbons are used as hydrogen storage carriers to realize hydrogenation reactions and dehydrogenation reactions under the action of catalysts and temperature conditions. The reaction process of organic liquid hydrogen storage is reversible, with a high hydrogen storage density, reaching 55 - 60 g / L, and the reversible hydrogen storage capacity can reach 5.5 - 7 wt%. Moreover, it is safe and convenient for storage and transportation, suitable for long-distance transportation, and can also utilize existing infrastructure such as pipelines and gas stations.

[0044] In the present invention, when it is necessary to release the stored hydrogen, only the first valve between the organic liquid storage tank and the first heat exchanger needs to be opened, and the organic liquid in the organic liquid storage tank is transported to the first heat exchanger to exchange heat with the heat transfer oil in the first heat exchanger. When the temperature reaches the temperature required for hydrogenation (150 - 250 °C), the organic liquid is transported to the hydrogenation reactor to contact and react with hydrogen to form an organic hydrogen storage liquid, which is then sent to the organic hydrogen storage liquid storage tank.

[0045] When it is necessary to release hydrogen, the second valve between the organic hydrogen storage liquid storage tank and the second heat exchanger is opened, and the organic hydrogen storage liquid is transported to the second heat exchanger to exchange heat with the heat transfer oil in the second heat exchanger. When the temperature reaches the temperature required for dehydrogenation (150 - 250 °C), the organic hydrogen storage liquid is transported to the dehydrogenation reactor to generate and output hydrogen, and is restored to an organic liquid, which is then transported to the organic liquid storage tank.

[0046] The hydrogen synthesis of methanol and methanol-to-hydrogen subsystem includes a methanol storage tank, a synthesis methanol reactor and a third heat exchanger of the synthesis methanol reactor, a methanol-to-hydrogen reactor and a fourth heat exchanger supporting the methanol-to-hydrogen reactor, pumps, valves, etc. The third heat exchanger is provided with two inlet ends and two outlet ends. One of the inlet ends is connected to one of the outlet ends of the heat transfer oil storage tank, and the other inlet end is used for introducing carbon dioxide and hydrogen, and a third valve is provided at this inlet end; one of the outlet ends is connected to the synthesis methanol reactor, and the other outlet end is connected to the fourth heat exchanger supporting the methanol-to-hydrogen reactor. The fourth heat exchanger is also provided with two inlet ends and two outlet ends. One of the outlet ends is connected to the methanol-to-hydrogen reactor, and the other outlet end is connected to the heat transfer oil storage tank; the remaining inlet end is used for introducing water, and a fourth valve is provided at this inlet section. The outlet end of the synthesis methanol reactor is connected to the methanol storage tank, and the outlet end of the methanol storage tank is connected to the fourth heat exchanger, and a fourth valve is provided between the outlet end of the methanol storage tank and the inlet end of the fourth heat exchanger.

[0047] It should be noted that methanol is an important chemical product and raw material, and is also an energy source and vehicle fuel with excellent performance. Since the synthesis of methanol from hydrogen and methanol-to-hydrogen are relatively simple, methanol is considered a liquid, normal temperature, normal pressure, and long-term storage method for hydrogen energy. For the synthesis of methanol from hydrogen, the mainstream process is the one-step method. Hydrogen and carbon dioxide react under the action of a metal catalyst at a temperature of 250 - 300 °C and a pressure of 5 - 10 MPa to produce methanol and water, which are then separated and rectified to produce methanol. For methanol-to-hydrogen, generally, methanol and water are mixed and heated to vaporize, and then enter the reforming reactor. At a temperature of 230 - 280 °C and a pressure of 1 - 5 MPa, under the action of a catalyst, the methanol cracking reaction (1) and the carbon monoxide shift reaction (2) occur to generate hydrogen and carbon dioxide, and the total reaction equation is (3). The generated H 2 and CO 2, After separation by pressure swing adsorption (PSA), high-purity hydrogen can be obtained.

[0048] CH 3 OH → CO + 2H 2 (1)

[0049] H 2 O + CO → CO 2 + H 2 (2)

[0050] CH 3 OH + H 2 O → CO 2 + 3H 2 (3)

[0051] In the present invention, when hydrogen needs to be synthesized into methanol for hydrogen storage, the third valve is directly opened, and hydrogen and carbon dioxide enter the third heat exchanger to exchange heat with heat transfer oil. When the temperature required for hydrogen synthesis into methanol (250 - 300 °C) is reached, it is transported to the methanol synthesis reactor, where methanol is produced and sent to the methanol storage tank, and the produced water is discharged.

[0052] When methanol needs to be reformed to produce hydrogen for hydrogen release, the fourth valve for inputting methanol into the methanol storage tank is directly opened, and methanol and water enter the fourth heat exchanger to exchange heat with heat transfer oil. When the temperature required for methanol reforming to produce hydrogen (230 - 280 °C) is reached, it is transported to the methanol reforming reactor, where hydrogen and carbon dioxide are produced, and hydrogen is separated.

[0053] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated device for organic liquid hydrogen storage, trough solar thermal energy, and methanol synthesis, characterized in that, the device includes a trough solar thermal subsystem, an organic liquid hydrogen storage subsystem, and a hydrogen synthesis methanol and methanol reforming for hydrogen production subsystem; wherein, in the trough solar thermal subsystem, there is a heat transfer oil storage tank, and the heat transfer oil storage tank is provided with two oil outlet pipelines, and the two oil outlet pipelines are respectively connected to the organic liquid hydrogen storage subsystem and the hydrogen synthesis methanol and methanol reforming for hydrogen production subsystem.

2. The integrated device for organic liquid hydrogen storage, trough solar thermal energy, and methanol synthesis according to claim 1, characterized in that, the trough solar thermal subsystem further includes a support, a reflector, and a heat collection tube; the reflector is installed on the support, and on the side of the support close to the organic liquid hydrogen storage subsystem, there is a heat transfer oil storage tank, and the inlet end of the heat transfer oil storage tank is connected to the heat collection tube; the reflector adopts a linear parabolic mirror surface reflection to focus sunlight on the heat collection tube to heat the working medium for power generation.

3. The integrated device for organic liquid hydrogen storage, trough solar thermal energy, and methanol synthesis according to claim 1, characterized in that, the temperature of the heat transfer oil in the heat transfer oil storage tank is 200 - 350 °C.

4. The integrated device for organic liquid hydrogen storage, trough solar thermal energy, and methanol synthesis according to claim 1, characterized in that, the organic liquid hydrogen storage subsystem includes: an organic liquid storage tank and a first heat exchanger supporting the organic liquid storage tank; an organic hydrogen storage liquid storage tank and a second heat exchanger supporting the organic hydrogen storage liquid storage tank; a hydrogenation reactor connected to the first heat exchanger and a dehydrogenation reactor connected to the second heat exchanger; the outlet end of the hydrogenation reactor is connected to the inlet end of the organic hydrogen storage liquid storage tank, and the outlet end of the dehydrogenation reactor is connected to the organic liquid storage tank; and a first valve provided between the organic liquid storage tank and the first heat exchanger and a second valve provided between the organic hydrogen storage liquid storage tank and the second heat exchanger.

5. The integrated device for organic liquid hydrogen storage, trough solar thermal energy, and methanol synthesis according to claim 4, characterized in that, the first heat exchanger is provided with two outlet ends and two inlet ends; one of the outlet ends of the first heat exchanger is connected to the inlet end of the hydrogenation reactor, and the other outlet end is connected to the inlet end of the second heat exchanger; one of the inlet ends of the first heat exchanger is connected to the liquid outlet pipeline of the organic liquid storage tank, and the other inlet end is connected to the oil outlet pipeline of the heat transfer oil storage tank, and the first valve is provided on the liquid outlet pipeline of the organic liquid storage tank.

6. The integrated device for organic liquid hydrogen storage, trough solar thermal energy, and methanol synthesis according to claim 4, characterized in that, the second heat exchanger is provided with two outlet ends and two inlet ends; one of the outlet ends of the second heat exchanger is connected to the inlet end of the dehydrogenation reactor, and the other outlet end is connected to the heat transfer oil storage tank; one of the inlet ends of the second heat exchanger is connected to the liquid outlet pipeline of the organic hydrogen storage liquid storage tank, the second valve is provided on the liquid outlet pipeline of the organic hydrogen storage liquid storage tank, and the other inlet end is connected to one of the outlet ends of the first heat exchanger.

7. The integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis according to claim 1, characterized in that, the hydrogen synthesis of methanol and methanol reforming to hydrogen subsystem comprises: a methanol synthesis reactor and a third heat exchanger supporting the methanol reactor; a methanol reforming to hydrogen reactor and a fourth heat exchanger supporting the methanol reforming to hydrogen reactor; and a third valve provided in front of the inlet end of the third heat exchanger and a fourth valve provided in front of the inlet end of the fourth heat exchanger.

8. The integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis according to claim 7, characterized in that, the third heat exchanger is provided with two outlet ends and two inlet ends; one of the outlet ends of the third heat exchanger is connected to the methanol synthesis reactor, and the other outlet end is connected to the inlet end of the fourth heat exchanger; one of the inlet ends of the third heat exchanger is connected to the oil outlet pipeline of the heat transfer oil storage tank, and the other inlet end is used for introducing carbon dioxide and hydrogen, and the third valve is provided in front of the inlet end for introducing carbon dioxide and hydrogen.

9. The integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis according to claim 7, characterized in that, the fourth heat exchanger is provided with two inlet ends and two outlet ends; one of the outlet ends of the fourth heat exchanger is connected to the methanol reforming to hydrogen reactor, and the other outlet end is connected to the heat transfer oil storage tank; one of the inlet ends of the fourth heat exchanger is connected to the outlet end of the third heat exchanger, and the other water outlet end is used for introducing water, and the fourth valve is provided in front of the inlet end for introducing water.

10. The integrated device for organic liquid hydrogen storage, trough solar thermal power generation, and methanol synthesis according to any one of claims 7-9, characterized in that, the hydrogen synthesis of methanol and methanol reforming to hydrogen subsystem further comprises a methanol storage tank; the methanol storage tank is connected to the outlet end of the methanol synthesis reactor, and the outlet end of the methanol storage tank is connected to the fourth heat exchanger.

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