CN216403847U - Photo-thermal coupling thermochemical hydrogen production system - Google Patents

Abstract

The present application proposes a photothermal coupled thermochemical hydrogen production system, including a photothermal system, a heat storage system, a heat supply system and a thermochemical reaction system, wherein the photothermal system concentrating solar energy directly irradiates the heat storage in the heat storage system On the medium, the heat storage medium directly absorbs solar radiant energy, the heat supply system is set outside the thermochemical reaction system, and the heat supply system is used to supply heat to the thermochemical reaction system, through the use of light and heat The system and heat storage system convert solar radiation energy into heat energy, and then supply the heat energy to the thermochemical reaction system through the heat supply system for thermochemical hydrogen production. At the same time as the utilization of renewable energy, it also provides a method for the resource utilization of biomass waste. Compared with the photoelectric hydrogen production method, this method provides a resource-recycling means for absorbing biomass waste for areas with large biomass waste production.

Description

A Photothermal Coupled Thermochemical Hydrogen Production System

technical field

The present application relates to the technical field of thermochemical hydrogen production, in particular to a photothermal coupled thermochemical hydrogen production system.

Background technique

H2 is a kind of clean energy, which is of great significance for the realization of carbon emission reduction and carbon neutrality goals. At present, 90% of H2 comes from the reforming reaction of fossil fuels, but fossil fuels are not renewable, so it is particularly important to find alternatives to fossil energy. Biomass energy can replace fossil energy for hydrogen production, which is renewable and abundant. The potential of biomass energy will be as high as 500EJ per year after 2050. One of the effective ways to convert biomass energy into hydrogen energy is thermochemical hydrogen production, and thermal energy can be obtained from the photothermal system. Conversion of hydrogen energy.

SUMMARY OF THE INVENTION

The present application aims to solve one of the technical problems in the related art at least to a certain extent.

To this end, the purpose of this application is to propose a photothermal coupled thermochemical hydrogen production system, which converts solar radiation energy into thermal energy through a photothermal system and a thermal storage system, and then supplies the thermal energy to a thermochemical reaction system through a thermal supply system. Thermochemical hydrogen production, which uses renewable energy to generate heat and biomass thermochemical hydrogen production, not only realizes the utilization of renewable energy, but also provides a method for the recycling of biomass waste. Compared with the photoelectric hydrogen production method, this method provides a resource-recycling means for absorbing biomass waste for areas with large biomass waste production.

In order to achieve the above purpose, a photothermal coupled thermochemical hydrogen production system proposed in this application includes a photothermal system, a heat storage system, a heat supply system and a thermochemical reaction system. On the heat storage medium in the thermal system, the heat storage medium directly absorbs solar radiation energy, the heat supply system is set on the outside of the thermochemical reaction system, and the heat supply system is used to supply the thermochemical reaction system. For heat supply, the heat storage system and the heat supply system are bidirectionally connected to form a circulation flow path through a heat supply pipeline and a return pipeline, and the heat storage system is used to provide a high-temperature heat storage medium into the heat supply system, while collecting The low-temperature heat storage medium returned in the heat supply system.

Further, the photothermal system is one or more of a trough system, a Fresnel system, a disk system or a tower system.

Further, the thermochemical reaction system is one or more of a gasification furnace, a pyrolysis furnace, a vertical furnace, a horizontal furnace, a two-stage furnace, and a three-stage furnace.

Further, the upper end of the thermochemical reaction system has a feed port, and the feed port is used for inputting biomass or biomass waste.

Further, it also includes a gas purification system, the upper end of the thermochemical reaction system has a gas outlet, the gas purification system is communicated with the gas outlet of the thermochemical reaction system, and the gas purification system is used for the thermochemical reaction system. The gas produced by the reaction system is purified.

Further, the heat storage medium is one of molten carbonate, potassium chloride, sodium fluoride or sodium chloride.

Further, the temperature of the heat supply system is between 500°C and 800°C.

Additional aspects and advantages of the present application will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of a photothermal coupled thermochemical hydrogen production system proposed in an embodiment of the present application.

Detailed ways

The following describes in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but should not be construed as a limitation on the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

FIG. 1 is a schematic structural diagram of a photothermal coupled thermochemical hydrogen production system proposed in an embodiment of the present application.

Referring to Figure 1, a photothermal coupled thermochemical hydrogen production system includes a photothermal system 1, a heat storage system 2, a heat supply system 3 and a thermochemical reaction system 4. The heat storage system 2 can be a calciner, and the injection into the calciner The heat storage medium realizes the conversion of light energy and heat energy through the phase change of the heat storage medium. The solar thermal system 1 concentrating solar energy directly irradiates the heat storage medium in the thermal storage system, and the thermal storage medium directly absorbs solar radiation energy. Specifically, the solar thermal system 1 can be arranged around the thermal storage system 2. , the sunlight is uniformly focused and irradiated onto the heat storage medium in the heat storage system 2, so that the solar photons directly interact with the heat storage medium to directly heat the reactant particles, and the heat storage medium can capture and absorb solar radiation energy in the full spectrum. The solar body absorbs, converts the solar energy into thermal energy, and drives the thermochemical reaction, thereby converting the solar energy into chemical energy. The heat supply system 3 is set on the outside of the thermochemical reaction system 4, and the heat supply system 3 is used to supply heat to the thermochemical reaction system 4. When the high temperature heat storage medium flows into the heat supply system 3, The high-temperature heat storage medium directly heats the thermochemical reaction system 4 through the outer side wall of the thermochemical reaction system 4, so that the temperature in the thermochemical reaction system 4 rises rapidly, and a thermochemical reaction occurs. The heat storage system 2 and the heat supply system 3 are connected bidirectionally through a heat supply pipe and a return pipe to form a circulation flow path. The first interface and the second interface, specifically, the heating pipeline is connected to the first interface, the return pipeline is connected to the second interface, and the high-temperature heat storage medium is injected into the heat supply system and flows out from the upper end of the heat supply system, prolonging the high temperature The residence time of the heat storage medium in the heat supply system can fully heat the thermochemical reaction system and help the thermochemical reaction in the thermochemical reaction system to occur. The heat storage system 2 is used to provide a high-temperature heat storage medium to the heat supply system 3, and at the same time collect the low-temperature heat storage medium returned from the heat supply system 3, and the heat storage medium continuously flows in the circulation flow path for a continuous period of time. Continuously provide heat for the thermochemical reaction system to realize the conversion of light energy and heat energy.

The photothermal system 1 is one or more of a trough system, a Fresnel system, a disc system or a tower system. The specific form of the photothermal system 1 can be determined according to the site and user requirements. This application This is not limited, as long as the solar energy can be effectively collected.

The thermochemical reaction system 4 is one or more of a gasification furnace, a pyrolysis furnace, a vertical furnace, a horizontal furnace, a two-stage furnace, and a three-stage furnace. The specific form of the thermochemical reaction system 4 can be based on The site and user requirements are determined, which is not limited in this application, as long as the biomass can be fully converted. In this embodiment, it is preferably a pyrolysis furnace.

The upper end of the thermochemical reaction system 4 has a feed port, and the feed port is used to input biomass or biomass waste. It is worth noting that the reaction material biomass and the catalyst are input at the same time, which can absorb the thermochemical reaction in time. The CO2 is converted into carbonate complexes, which can achieve the goal of carbon emission reduction in the process of thermochemical hydrogen production.

A photothermal coupled thermochemical hydrogen production system further includes a gas purification system 5, the upper end of the thermochemical reaction system 4 has an air outlet, and the gas purification system 5 is communicated with the air outlet of the thermochemical reaction system 4, so The gas purification system 5 is used to purify the gas produced by the thermochemical reaction system 4 . The purification method can be one or more of pressure swing adsorption, temperature swing adsorption, membrane separation method and metal hydride method. Correspondingly, the gas purification system can be a pressure swing adsorption hydrogen production device, a low temperature adsorption hydrogen production industrial device, a membrane One or more of the separation method hydrogen production device and the ultrapure hydrogen extraction device with metal hydride. The purified hydrogen can be used in one or more of proton exchange membrane fuel cell power generation systems, solid oxide fuel cell power generation systems, molten carbonate fuel cell power generation systems, and phosphoric acid fuel cell power generation systems.

The heat storage medium is one of molten carbonate, potassium chloride, sodium fluoride or sodium chloride. In this embodiment, it is preferably molten carbonate, which has good heat storage capacity and can be used with high efficiency. , High energy density storage of solar energy.

The temperature of the heat supply system 3 is between 500°C and 800°C. The better temperature conditions are improved for the thermochemical reaction of the thermochemical reaction system 4, and the gas production efficiency is higher.

A photothermal coupled thermochemical hydrogen production method, applied to the above-mentioned photothermal coupled thermochemical hydrogen production system, comprises the following steps:

The solar energy is converted into thermal energy by the solar thermal system 1 and stored in the thermal storage medium of the thermal storage system 2;

Pump the heat storage medium in the heat storage system 2 into the heat supply system 3;

The thermochemical reaction system 4 is heated by using the heat supply system 3 as a heat source, and the biomass in the thermochemical reaction system 4 undergoes thermochemical reaction and produces gas.

The thermochemical reaction is an alkali thermal reaction. The gas product after the alkali-thermal reaction does not contain carbon oxides, which can achieve the goal of carbon emission reduction in the process of thermochemical hydrogen production.

In the alkali-thermal reaction, the catalyst is an alkali metal hydroxide. In the alkali-thermal reaction, the alkali catalyst can be the first main group alkali metal hydroxide represented by sodium hydroxide, or the second main group alkali metal hydroxide represented by calcium hydroxide, and the activity of the catalyst is high, Has high catalytic efficiency.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are only used for the purpose of description, and should not be construed as indicating or implying relative importance. Also, in the description of this application, unless otherwise specified, "plurality" means two or more.

Any description of a process or method in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing a specified logical function or step of the process , and the scope of the preferred embodiments of the present application includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present application belong.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (7)

1. The photo-thermal coupling thermochemical hydrogen production system is characterized by comprising a photo-thermal system, a heat storage system, a heat supply system and a thermochemical reaction system, wherein the photo-thermal system concentrates solar energy and directly irradiates the heat storage medium in the heat storage system, the heat storage medium directly absorbs solar radiation energy, the heat supply system is sleeved outside the thermochemical reaction system, the heat supply system is used for supplying heat to the thermochemical reaction system, the heat storage system and the heat supply system are connected in a bidirectional mode through a heat supply pipeline and a backflow pipeline to form a circulation flow path, and the heat storage system is used for supplying a high-temperature heat storage medium to the heat supply system and collecting a low-temperature heat storage medium which flows back in the heat supply system.

2. The system for photothermal coupling thermochemical hydrogen production of claim 1 wherein the photothermal system is one or more of a trough system, a fresnel system, a tray system, or a tower system.

3. The photo-thermal coupling thermochemical hydrogen production system of claim 1 wherein the thermochemical reaction system is one or more of a gasification furnace, a pyrolysis furnace, a vertical furnace, a horizontal furnace, a two-stage furnace, and a three-stage furnace.

4. The photo-thermal coupling thermochemical hydrogen production system of claim 1 wherein the thermochemical reaction system has a feed inlet at an upper end for inputting biomass or biomass waste.

5. The photo-thermal coupling thermochemical hydrogen production system of claim 1 further comprising a gas purification system, said thermochemical reaction system having a gas outlet at an upper end, said gas purification system being in communication with the gas outlet of said thermochemical reaction system, said gas purification system being configured to purify the gas produced by said thermochemical reaction system.

6. The system of claim 1, wherein the heat storage medium is one of a molten carbonate, potassium chloride, sodium fluoride, or sodium chloride.

7. The photo-thermal coupled thermochemical hydrogen production system of claim 1 wherein the temperature of the heat supply system is between 500 ℃ and 800 ℃.

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