Renewable energy electric power hydrogen ammonia energy storage system
Through the photothermal heat collection and heat storage system, the use of paraffin and molten salt to store heat in different temperature zones is solved, and the problem of high energy consumption in the preparation process of green hydrogen and chlorammonia is achieved, efficient utilization of clean energy and flexible heating of heat are achieved, and the efficiency of heating of clean energy is achieved, thereby improving the efficiency of heating and improving The production efficiency of hydrogen energy and ammonia gas.
Patent Information
- Application Number
- CN202411205258.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2024-12-10
AI Technical Summary
The existing technology has high energy consumption problems in the preparation of green hydrogen and chlorammonia, especially the traditional Haber-Bosch method synthesis of ammonia needs to be carried out under high temperature and high pressure, resulting in excessive energy consumption and the heat storage system cannot achieve different temperature zones. Heat storage and flexible release limit the effective utilization of clean energy.
The photothermal heat collection system and the photothermal heat storage system are used to store heat in the low-temperature and high-temperature zones through the filled bed heat storage tank. The heat in the low-temperature zone is stored separately through the filling bed heat storage tank. The heat conduction oil is used as the heat conduction carrier and provided to the electrolytic tank. The ammonia synthesis tower realizes heat heating in different temperature zones.
It improves the utilization rate of clean energy, achieves flexible heat release in different temperature zones, meets the heat needs of hydrogen production and ammonia production processes, reduces energy consumption, and improves the carbon emission efficiency of the zero-emission hydrogen energy production and the synthetic ammonia industry.
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Figure CN119101926A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of hydrogen and ammonia production, and in particular relates to a renewable energy electric power hydrogen and ammonia energy storage system. Background Art
[0002] The advantage of green hydrogen and green ammonia is that their production process has little impact on the environment. Green hydrogen is produced by electrolyzing water, using clean energy (such as wind energy and solar energy) to decompose water molecules to produce hydrogen and oxygen. This process does not produce carbon dioxide or other greenhouse gases, so it is considered an important part of future clean energy. The production of green ammonia is based on green hydrogen. First, green hydrogen produced by electrolyzing water reacts with nitrogen in the air under the action of a catalyst to produce ammonia. Since the entire process also relies on renewable energy, the production of green ammonia also has the characteristics of low carbon emissions. As an important chemical raw material and fertilizer, the green production method of ammonia will have a profound impact on agriculture and industry.
[0003] However, the high energy consumption in the preparation of green hydrogen and green ammonia poses a significant challenge in their utilization. The electrolysis temperature of alkaline electrolyzers is generally between 60°C and 80°C. This is because within this temperature range, the electrolyte has good conductivity and can effectively reduce the occurrence of side reactions. In order to maintain this temperature, the electrolyzer is usually equipped with a heating and cooling system. A large amount of electricity is usually consumed in this process.
[0004] The traditional Haber-Bosch process for synthesizing green ammonia requires high temperature and high pressure, usually around 400°C, which consumes a lot of energy.
[0005] Therefore, the organic combination of clean energy hydrogen production and the synthetic ammonia industry will help improve the utilization rate of clean energy, achieve zero-emission production and long-distance safe transportation of hydrogen, and reduce carbon emissions from the synthetic ammonia industry, which is of great strategic significance to the path of sustainable development.
[0006] The Chinese patent with the announcement number CN 217676838 U discloses a solar ammonia production system, which organically combines the use of solar energy with the synthetic ammonia industry and can help achieve the dual carbon goals. However, its heat storage system cannot store heat in different temperature zones, and thus cannot release heat in different temperature zones as needed to meet different reaction requirements, which to some extent restricts the effective use of clean energy. Summary of the invention
[0007] In view of this, the purpose of the present invention is to provide a renewable energy power hydrogen and ammonia energy storage system so that while realizing the organic combination of clean energy utilization and hydrogen and ammonia production industries, heat storage in different temperature zones can be achieved, and then heat in different temperature zones can be released as needed to meet the needs of hydrogen and ammonia production, thereby improving the effective utilization rate of clean energy.
[0008] The present invention solves the above problems by the following technical means:
[0009] A renewable energy electric power hydrogen and ammonia energy storage system of the present invention comprises a photothermal heat collection system, a photothermal heat storage system, a clean energy electrolysis hydrogen production system and an ammonia synthesis tower. The photothermal heat storage system comprises a packed bed type heat storage tank. Two phase change materials for storing heat in different temperature zones are arranged in the packed bed type heat storage tank. The heat in the two different temperature zones is used for heating the electrolytic hydrogen reaction and the synthetic ammonia reaction respectively.
[0010] Furthermore, the clean energy electrolysis hydrogen production system includes a clean energy power generation system, a junction box and an energy storage battery assembly and an electrolyzer. The clean energy power generation system generates electricity using wind energy and / or electric energy. The clean energy power generation system is connected to the junction box and the energy storage battery assembly. The junction box and the energy storage battery assembly are connected to the electrolyzer, so that the current generated by the clean energy power generation system is supplied to the electrolyzer through the junction box and the energy storage battery, so that the electrolyzer generates hydrogen by electrolysis.
[0011] Furthermore, it also includes an air separator, a gas mixing container, a gas compression device and an ammonia cooling tower. The air separator separates air to produce nitrogen, the gas mixing container mixes hydrogen and nitrogen, the gas compression device compresses the mixed gas, and the compressed mixed gas passes through an ammonia synthesis tower to undergo a synthetic ammonia reaction, and the synthesized ammonia is cooled by the ammonia cooling tower.
[0012] Furthermore, the photothermal heat collection system is used to receive solar energy and generate heat. The heat generated by the photothermal heat collection system uses heat transfer oil as a heat conduction carrier and is stored in a filled bed type heat storage tank.
[0013] Furthermore, the heat in the low temperature zone stored in the packed bed type heat storage tank is transferred to the electrolyzer through the hydrogen production heat exchanger with thermal oil as the heat conduction carrier for heat supply in the electrolysis process; the heat in the high temperature zone stored in the packed bed type heat storage tank is transferred to the ammonia synthesis tower through the ammonia production heat exchanger with thermal oil as the heat conduction carrier for heat supply in the ammonia synthesis process.
[0014] Furthermore, it also includes a heat transfer oil supply circulation system, which includes a heat transfer oil storage tank and an oil pump. The heat transfer oil in the heat transfer oil storage tank is pumped by the oil pump to act as a heat conduction carrier, and the heat transfer oil after heat exchange flows back to the heat transfer oil storage tank to circulate.
[0015] Furthermore, the electrolytic cell is any one of an alkaline electrolytic cell and a proton exchange membrane electrolytic cell.
[0016] Furthermore, the solar thermal collection system adopts one or more of trough-type collection, dish-type collection or tower-type collection.
[0017] Furthermore, the low temperature zone phase change material in the packed bed type heat storage tank is paraffin.
[0018] Furthermore, the high temperature zone phase change material of the packed bed type heat storage tank is molten salt.
[0019] Beneficial effects of the present invention:
[0020] The renewable energy power hydrogen and ammonia energy storage system of the present application converts wind energy and solar energy into electrical energy through a clean energy power generation system, and converts solar energy into thermal energy using a photothermal collection system. The thermal energy is stored through the photothermal heat storage system, and heat storage in different temperature zones is achieved through a packed bed heat storage tank and phase change materials in different temperature zones. The thermal energy in different temperature zones is used to provide a high-temperature reaction environment for the ammonia synthesis tower and the electrolyzer respectively, and electric energy is used to electrolyze water to produce hydrogen. The hydrogen produced by electrolyzing water is provided to the ammonia synthesis tower as a reactant, thereby realizing the organic combination of clean energy utilization and hydrogen and ammonia production industries, and realizing heat storage in different temperature zones. Then, the heat in different temperature zones can be released as needed to meet the needs of hydrogen and ammonia production, thereby improving the effective utilization rate of clean energy. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;
[0023] Figure 2 Schematic diagram of the working process of the solar thermal energy storage system.
[0024] Reference numerals:
[0025] 1. Combiner box and energy storage battery assembly; 2. Clean energy power generation system; 3. Solar thermal collection system; 4. Solar thermal heat storage system; 5. Electrolyzer; 6. Air separator; 7. Gas mixing container; 8. Gas compression device; 9. Ammonia synthesis tower; 10. Ammonia cooler; 11. Thermal oil storage tank; 12. Packed bed heat storage tank; 13. Ammonia production heat exchanger; 14. Hydrogen production heat exchanger; 15. Oil pump; 16. Electric heating device. DETAILED DESCRIPTION
[0026] The present invention is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present invention will become clearer and more specific. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.
[0027] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0029] like Figure 1 to Figure 2 As shown, an embodiment of the present invention discloses a renewable energy power hydrogen and ammonia energy storage system, including a photothermal heat collection system 3, a photothermal heat storage system 4, a clean energy electrolysis hydrogen production system and an ammonia synthesis tower 9, wherein the photothermal heat storage system includes a packed bed type heat storage tank 12, wherein the packed bed type heat storage tank is provided with two phase change materials for storing heat in different temperature zones, and the heat in the two different temperature zones is respectively used for environmental heating of the electrolytic hydrogen reaction and the synthetic ammonia reaction.
[0030] The clean energy electrolysis hydrogen production system includes a clean energy power generation system 2, a junction box and energy storage battery assembly 1 and an electrolyzer 5. The clean energy power generation system generates electricity using wind energy and / or electric energy. The clean energy power generation system is connected to the junction box and the energy storage battery assembly. The junction box and the energy storage battery assembly are connected to the electrolyzer so that the current generated by the clean energy power generation system is supplied to the electrolyzer through the junction box and the energy storage battery, so that the electrolyzer generates hydrogen by electrolysis.
[0031] It also includes an air separator 6, a gas mixing container 7, a gas compression device 8 and an ammonia cooling tower 10. The air separator separates air to produce nitrogen, the gas mixing container mixes hydrogen and nitrogen, the gas compression device compresses the mixed gas, and the compressed mixed gas passes through an ammonia synthesis tower to undergo a synthetic ammonia reaction, and the synthesized ammonia is cooled by the ammonia cooling tower.
[0032] The photothermal heat collection system is used to receive solar energy and generate heat. The heat generated by the photothermal heat collection system uses heat transfer oil as a heat conduction carrier and is stored in a filled bed type heat storage tank.
[0033] The heat in the low temperature zone stored in the packed bed type heat storage tank is transferred to the electrolyzer through the hydrogen production heat exchanger 14 with heat transfer oil as the heat conduction carrier for heat supply in the electrolysis process; the heat in the high temperature zone stored in the packed bed type heat storage tank is transferred to the ammonia synthesis tower through the ammonia production heat exchanger 13 with heat transfer oil as the heat conduction carrier for heat supply in the ammonia synthesis process.
[0034] It also includes a heat transfer oil supply circulation system, which includes a heat transfer oil storage tank 11 and an oil pump 15. The heat transfer oil in the heat transfer oil storage tank is pumped by the oil pump to act as a heat transfer carrier. The heat transfer oil after heat exchange flows back to the heat transfer oil storage tank to circulate.
[0035] The electrolyzer is any one of an alkaline electrolyzer and a proton exchange membrane electrolyzer. In this embodiment, the electrolyzer is an alkaline electrolyzer, the electrolyte in the electrolyzer is a 30% potassium hydroxide solution or includes a proton exchange membrane, the working temperature of the electrolyzer is 70-90°C, and the clean energy power generation system can provide electricity for the electrolysis of the electrolyzer, so that the hydrogen generated after the electrolysis of the electrolyzer can be supplied to the ammonia synthesis tower for reaction to prepare ammonia, and the oxygen obtained by electrolysis can be directly discharged or sold at the price of pure oxygen after separation and purification.
[0036] The solar thermal collection system has a heat collection method of one or more of trough heat collection, dish heat collection or tower heat collection.
[0037] The low temperature phase change material in the packed bed heat storage tank is paraffin, and the phase change temperature is about 60° C. The high temperature phase change material in the packed bed heat storage tank is molten salt, and its phase change temperature is above 400° C. In some embodiments, the molten salt can be one or more of molten carbonate, potassium chloride, sodium fluoride or sodium chloride.
[0038] It is understandable that since the process of preparing ammonia requires raw materials hydrogen and nitrogen, as well as high-temperature heating, the solar thermal collection system absorbs solar energy to generate heat, and the excess heat can be collected by the solar thermal storage system. Phase change materials in different temperature zones can be used to supply heat to different temperature zones. On the one hand, it can be supplied to the electrolyzer for heating, and on the other hand, it can be supplied to the ammonia synthesis tower for heating.
[0039] In some embodiments, the solar thermal heat storage system can control the heat exchange of the thermal oil by using valves, and can directly supply solar energy to the preparation of hydrogen and ammonia during the day, while continuing the preparation process of hydrogen and ammonia through the solar thermal heat storage system at night.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.
Claims
1. A renewable energy power hydrogen and ammonia energy storage system, Features: It includes a photothermal heat collection system, a photothermal heat storage system, a clean energy electrolysis hydrogen production system and an ammonia synthesis tower. The photothermal heat storage system includes a packed bed heat storage tank. Two phase change materials for storing heat in different temperature zones are arranged in the packed bed heat storage tank. The heat in the two different temperature zones is used for heating the hydrogen electrolysis reaction and the ammonia synthesis reaction respectively.
2. The renewable energy power hydrogen and ammonia energy storage system according to claim 1, Features: The clean energy electrolysis hydrogen production system includes a clean energy power generation system, a junction box and an energy storage battery assembly and an electrolyzer. The clean energy power generation system generates electricity using wind energy and / or electric energy. The clean energy power generation system is connected to the junction box and the energy storage battery assembly. The junction box and the energy storage battery assembly are connected to the electrolyzer, so that the current generated by the clean energy power generation system is supplied to the electrolyzer through the junction box and the energy storage battery, so that the electrolyzer generates hydrogen by electrolysis.
3. The renewable energy power hydrogen and ammonia energy storage system according to claim 2, Features: It also includes an air separator, a gas mixing container, a gas compression device and an ammonia cooling tower. The air separator separates air to produce nitrogen, the gas mixing container mixes hydrogen and nitrogen, the gas compression device compresses the mixed gas, and the compressed mixed gas passes through an ammonia synthesis tower to undergo a synthetic ammonia reaction, and the synthesized ammonia is cooled by the ammonia cooling tower.
4. The renewable energy power hydrogen and ammonia energy storage system according to claim 3, Features: The photothermal heat collection system is used to receive solar energy and generate heat. The heat generated by the photothermal heat collection system uses heat transfer oil as a heat conduction carrier and is stored in a filled bed type heat storage tank.
5. The renewable energy power hydrogen and ammonia energy storage system according to claim 4, Features: The heat in the low temperature zone stored in the packed bed type heat storage tank is transferred to the electrolyzer through the hydrogen production heat exchanger with heat transfer oil as the heat conduction carrier for heat supply in the electrolysis process; the heat in the high temperature zone stored in the packed bed type heat storage tank is transferred to the ammonia synthesis tower through the ammonia production heat exchanger with heat transfer oil as the heat conduction carrier for heat supply in the ammonia synthesis process.
6. The renewable energy power hydrogen and ammonia energy storage system according to claim 5, Features: It also includes a heat transfer oil supply circulation system, which includes a heat transfer oil storage tank and an oil pump. The heat transfer oil in the heat transfer oil storage tank is pumped by the oil pump to act as a heat conduction carrier, and the heat transfer oil after heat exchange flows back to the heat transfer oil storage tank to circulate.
7. The renewable energy power hydrogen and ammonia energy storage system according to claim 6, Features: The electrolytic cell is any one of an alkaline electrolytic cell and a proton exchange membrane electrolytic cell.
8. The renewable energy power hydrogen and ammonia energy storage system according to claim 7, Features: The solar thermal collection system has a heat collection method of one or more of trough heat collection, dish heat collection or tower heat collection.
9. The renewable energy power hydrogen and ammonia energy storage system according to claim 8, Features: The low temperature phase change material in the packed bed type heat storage tank is paraffin.
10. The renewable energy power hydrogen and ammonia energy storage system according to claim 9, It is characterized by: The high temperature zone phase change material of the packed bed type heat storage tank is molten salt.