Super-long-time energy storage system for converting solar energy into chemical energy

Abstract

The utility model relates to the technical field of solar energy storage, and discloses a super-long-time energy storage system for converting solar energy into chemical energy, which comprises a photovoltaic power generation device, a water electrolysis hydrogen production device, a hydrogenation methanol production device and a calcium-based energy storage device, the water electrolysis hydrogen production device uses the photovoltaic power generation device to generate electric energy to carry out water electrolysis reaction to generate hydrogen and oxygen, and the calcium-based energy storage device uses the water electrolysis hydrogen production device to generate hydrogen as fuel to calcine limestone to generate carbon dioxide and calcium oxide. The hydrogenation methanol production device uses the water electrolysis hydrogen production device to electrolyze water to produce hydrogen and the calcium-based energy storage device to produce carbon dioxide as raw materials to react to produce liquid methanol for storage, and the calcium-based energy storage device produces calcium oxide through calcination and produces calcium hydroxide as an energy storage substance; solar energy is converted into liquid methyl alcohol, calcium oxide and calcium hydroxide, long-time keeping of light energy is achieved, and meanwhile storage operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of solar energy storage, and more specifically to an ultra-long-term energy storage system for converting solar energy into chemical energy. Background Art

[0002] Solar energy refers to the thermal radiation energy of the sun, which is mainly manifested in what is often called sunlight. It is a renewable energy source. The development of solar photovoltaic power generation and the conversion and utilization of clean energy have far-reaching significance. The limitation of solar energy lies in the intermittent nature of solar radiation. There is a dilemma that it cannot generate stable electricity according to actual needs. Therefore, energy storage devices are needed to store the electricity generated by photovoltaic power generation. Common energy storage methods include phase change energy storage, solid energy storage, compressed air energy storage, pumped storage, battery energy storage, etc.

[0003] Deficiencies in existing technology: However, the existing technology is unable to achieve ultra-long-term storage and is inconvenient to transport. It can only be used near photovoltaic discharge stations and has high transportation costs. Therefore, this application provides an ultra-long-term energy storage system that converts solar energy into chemical energy to achieve ultra-long-term energy storage and support long-distance transportation. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an ultra-long-term energy storage system for converting solar energy into chemical energy, so as to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an ultra-long-term energy storage system for converting solar energy into chemical energy, comprising a photovoltaic power generation device, and also comprising: a water electrolysis hydrogen production device, a hydrogenation methanol production device and a calcium-based energy storage device. The water electrolysis hydrogen production device is connected to the photovoltaic power generation device via a wire, and uses the photovoltaic power generation device to generate electricity for water electrolysis reaction to produce hydrogen and oxygen. The calcium-based energy storage device is connected to the water electrolysis hydrogen production device via a conduit, and uses the hydrogen generated by the water electrolysis hydrogen production device as fuel to calcine limestone to produce carbon dioxide and calcium oxide. The hydrogenation methanol production device is connected to the water electrolysis hydrogen production device via a conduit, and uses the water electrolysis hydrogen production device to electrolyze water to generate hydrogen and the calcium-based energy storage device to generate carbon dioxide as raw materials to react and produce liquid methanol for storage. The calcium-based energy storage device generates heat by reacting the calcium oxide generated by calcination with water to heat water for residents to use, and produces calcium hydroxide as an energy storage material.

[0006] Furthermore, the photovoltaic power generation device includes a photovoltaic module, a battery pack, an electrical equipment and an inverter. The photovoltaic module is composed of solar cells connected in series through wires. The photovoltaic module wires are connected to the inverter to convert direct current into alternating current to power the electrical equipment. The photovoltaic module is connected to the battery pack through wires to store electrical energy and power the water electrolysis hydrogen production device.

[0007] Furthermore, the electrolysis water hydrogen production device includes an electrolyzer, a hydrogen storage tank, an oxygen purification device and an oxygen storage tank. The oxygen purification device is connected to the battery pack through a wire. An ion exchange membrane is provided at the center position inside the electrolyzer to divide the electrolyzer into a cathode and an anode. A water injection pipe is installed on the top of the electrolyzer. The air inlet of the oxygen purification device is connected to the anode of the electrolyzer through the oxygen purification device, and the air inlet of the hydrogen storage tank is connected to the cathode of the electrolyzer.

[0008] Furthermore, the calcium-based energy storage device includes limestone calcining equipment, a calcium oxide digestion reactor and a rotary kiln, the hydrogenation methanol device includes a methanol reactor and a methanol storage tank, the feed port of the methanol storage tank is connected to the discharge port of the methanol reactor, the top of the limestone calcining equipment is provided with a limestone inlet, the air inlet of the limestone calcining equipment is connected to the air outlet of the hydrogen storage tank through a conduit, the air outlet of the limestone calcining equipment is connected to the air inlet of the methanol reactor through a conduit, the feed port of the methanol storage tank is connected to the discharge port of the hydrogen storage tank, a carbon dioxide purification device is provided between the methanol reactor and the limestone calcining equipment, the discharge port of the limestone calcining equipment is connected to the feed port of the calcium oxide digestion reactor through a conduit, the discharge port of the calcium oxide digestion reactor is connected to a screening device, the calcium-based energy storage device uses the limestone calcining equipment to generate hydrogen as fuel using the electrolytic water hydrogen production device to calcine limestone to produce carbon dioxide and calcium oxide, and the calcium-based energy storage device generates calcium hydroxide and heat by reacting calcium oxide with water in the calcium oxide digestion reactor.

[0009] Furthermore, the top air outlet of the calcium oxide digestion reactor is connected to a second fan, the air outlet of the second fan is connected to a second dust collector, the outlet of the second dust collector is connected to a first heat exchanger, the first heat exchanger is connected to a hot water storage tank through a conduit, and the water outlet of the hot water storage tank is connected to a user through a conduit.

[0010] Furthermore, the rotary kiln is divided into a preheating section and a reaction section. The waste outlet of the screening equipment is connected to the preheating section of the rotary kiln. The reaction section of the rotary kiln is connected to the discharge outlet of the limestone calcining equipment. The side of the rotary kiln is provided with a first fan, a first dust collector and a second heat exchanger. The rotary kiln is intermittent according to the duration of illumination. After a single reaction is completed, a large amount of residual heat energy of the material and equipment is replaced by the first fan, the first dust collector and the second heat exchanger, and converted into hot water for heating, thereby recovering heat to the greatest extent and reducing energy waste.

[0011] Furthermore, a first remote thermometer is provided on the top of the limestone calcining equipment, a flow meter and a regulating control valve are provided between the hydrogen storage tank and the limestone calcining equipment, and a second remote thermometer is provided between the user and the hot water storage tank.

[0012] The technical effects and advantages of this utility model are:

[0013] 1. This utility model converts solar energy into electrical energy through a photovoltaic power generation device. Part of this energy is converted into alternating current (AC) to power the hydrogenation-to-methanol unit and the calcium-based energy storage device, and part of this energy is converted into direct current (DC) for storage or to power the water electrolysis hydrogen production unit. The water electrolysis hydrogen production unit uses the DC power generated by the photovoltaic power generation device to electrolyze water to produce oxygen and hydrogen for storage. Part of the hydrogen provides feedstock for the hydrogenation-to-methanol unit and the calcium-based energy storage device. The calcium-based energy storage device uses the hydrogen generated by the water electrolysis hydrogen production unit as fuel to calcine limestone to produce calcium oxide, enabling storage across months or even years. When energy is needed, the material is fed into a calcium oxide digestion reactor to release heat, which is then collected by a heat recovery system and transmitted to the energy user, where calcium hydroxide is also collected. The screened, high-specific-surface-area calcium hydroxide product can be used in environmental protection industries such as desulfurization, garbage disposal plants, and wastewater treatment.

[0014] 2. This utility model uses a water electrolysis hydrogen production device to electrolyze water, partially producing hydrogen that is fed into a methanol reactor and combined with carbon dioxide produced by a limestone calcination device to synthesize methanol. This process transforms carbon dioxide into a combustible raw material, achieving zero carbon emissions while also converting hydrogen, a resource that is difficult to store and transport, into a low-carbon transportation fuel.

[0015] 3. This utility model generates a large amount of water vapor through the reaction of calcium oxide and water within the calcium oxide digestion reactor. A second fan draws this water vapor into a second dust collector for impurity removal before it enters the first heat exchanger for heat exchange. Some of this water vapor circulates through a conduit with the user for reuse or is sent to a hot water storage tank for storage. The rotary kiln operates intermittently depending on the duration of the light exposure. After a single reaction, the first fan, first dust collector, and second heat exchanger displace the remaining heat energy from the materials and equipment, converting it into hot water for heating. This maximizes heat recovery and minimizes energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic structural diagram of the calcium-based energy storage device of the present utility model;

[0018] Figure 3 It is a schematic diagram of the overall process structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the calcium-based energy storage process of the utility model.

[0020] The accompanying drawings are marked as follows: 1. Photovoltaic power generation device; 101. Photovoltaic module; 102. Battery pack; 103. Electrical equipment; 104. Inverter; 2. Water electrolysis hydrogen production device; 201. Electrolyzer; 202. Hydrogen storage tank; 203. Oxygen purification equipment; 204. Regulating control valve; 205. Flow meter; 206. Oxygen storage tank; 3. Hydrogenation methanol production device; 301. Methanol reactor; 302. Methanol storage tank; 4. Calcium-based energy storage device; 401. Limestone calcining equipment; 402. First remote thermometer; 403. Carbon dioxide purification equipment; 404. User; 405. Calcium oxide digestion reactor; 406. Rotary kiln; 407. First fan; 408. First dust collector; 409. Screening equipment; 410. Second fan; 411. Second dust collector; 412. First heat exchanger; 413. Hot water storage tank; 414. Second remote thermometer; 415. Second heat exchanger. DETAILED DESCRIPTION

[0021] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The ultra-long-term energy storage system for converting solar energy into chemical energy involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Reference Figures 1 to 4The utility model provides an ultra-long-term energy storage system for converting solar energy into chemical energy, comprising a photovoltaic power generation device 1, and further comprising: a water electrolysis hydrogen production device 2, a hydrogenation methanol production device 3 and a calcium-based energy storage device 4. The water electrolysis hydrogen production device 2 is connected to the photovoltaic power generation device 1 through a wire, and uses the photovoltaic power generation device 1 to generate electricity for water electrolysis reaction to generate hydrogen and oxygen. The calcium-based energy storage device 4 is connected to the water electrolysis hydrogen production device 2 through a conduit, and uses the hydrogen generated by the water electrolysis hydrogen production device 2 as fuel to calcine limestone to generate carbon dioxide and calcium oxide. The hydrogenation methanol production device 3 is connected to the water electrolysis hydrogen production device 2 through a conduit, and uses the water electrolysis hydrogen production device 2 to electrolyze water to generate hydrogen and the carbon dioxide generated by the calcium-based energy storage device 4 as raw materials to react and generate liquid methanol for storage. The calcium-based energy storage device 4 generates heat by reacting the calcium oxide generated by calcination with water to heat water for residents to use, and generates calcium hydroxide as an energy storage material. The water electrolysis hydrogen production device 2 and the hydrogenation methanol production device 3 The photovoltaic power generation device 1 is connected to the calcium-based energy storage device 4 through a conduit. The photovoltaic power generation device 1 converts solar energy into electrical energy, part of which is converted into alternating current to provide electrical energy for the hydrogenation to methanol device 3 and the calcium-based energy storage device 4, and part of which is converted into direct current for storage or to provide electrical energy for the electrolysis of water to hydrogen device 2. The electrolysis of water to hydrogen device 2 uses the direct current generated by the photovoltaic power generation device 1 to electrolyze water to produce oxygen and hydrogen for storage, part of which provides raw materials for the hydrogenation to methanol device 3 and the calcium-based energy storage device 4. The calcium-based energy storage device 4 uses the hydrogen produced by the electrolysis of water to hydrogen device 2 as fuel to calcine limestone to produce calcium oxide and carbon dioxide. The hydrogenation to methanol device 3 uses the carbon dioxide produced by the calcium-based energy storage device 4 and the hydrogen produced by the electrolysis of water to hydrogen device 2 as raw materials to react to produce liquid methanol for storage. At the same time, the calcium-based energy storage device 4 produces high-surface calcium hydroxide through the reaction of calcium oxide and water for storage, and at the same time, the heat generated during the reaction is transferred to the water through heat exchange for reuse.

[0023] Among them, the photovoltaic power generation device 1 includes a photovoltaic module 101, a battery pack 102, an electrical equipment 103 and an inverter 104. The photovoltaic module 101 is composed of solar cells connected in series through wires. The wires of the photovoltaic module 101 are connected to the inverter 104 to convert direct current into alternating current to power the electrical equipment 103. The photovoltaic module 101 is connected to the battery pack 102 through wires to store electrical energy and power the water electrolysis hydrogen production device 2.

[0024] Among them, the electrolysis water hydrogen production device 2 includes an electrolyzer 201, a hydrogen storage tank 202, an oxygen purification device 203 and an oxygen storage tank 206. The oxygen purification device 203 is connected to the battery pack 102 through a wire. An ion exchange membrane is provided at the center position of the electrolyzer 201 to divide the electrolyzer 201 into a cathode and an anode. A water injection pipe is installed on the top of the electrolyzer 201. The air inlet of the oxygen purification device 203 is connected to the anode of the electrolyzer 201 through the oxygen purification device 203, and the air inlet of the hydrogen storage tank 202 is connected to the cathode of the electrolyzer 201. The photovoltaic power generation device 1 generates direct current and enters the electrolyzer 201 to electrolyze water. The oxygen generated at the anode is removed by the oxygen purification device 203 and then enters the oxygen storage tank 206 for storage. The hydrogen generated at the cathode is sent to the hydrogen storage tank 202 for storage.

[0025] Among them, the calcium-based energy storage device 4 includes a limestone calcining device 401, a calcium oxide digestion reactor 405 and a rotary kiln 406, the hydrogenation methanol device 3 includes a methanol reactor 301 and a methanol storage tank 302, the feed port of the methanol storage tank 302 is connected to the discharge port of the methanol reactor 301, the top of the limestone calcining device 401 is provided with a limestone inlet, the limestone calcining device 401 and the rotary kiln 406 both adopt rotary calcining kilns, the air inlet of the limestone calcining device 401 is connected to the air outlet of the hydrogen storage tank 202 through a conduit, the air outlet of the limestone calcining device 401 is connected to the air inlet of the methanol reactor 301 through a conduit, the feed port of the methanol storage tank 302 is connected to the discharge port of the hydrogen storage tank 202, a carbon dioxide purification device 403 is provided between the methanol reactor 301 and the limestone calcining device 401, the discharge port of the limestone calcining device 401 is connected to the feed port of the calcium oxide digestion reactor 405 The discharge port of the calcium oxide digestion reactor 405 is connected to a screening device 409 through a conduit connection. The calcium-based energy storage device 4 uses the electrolytic water hydrogen production device 2 to generate hydrogen through the limestone calcining device 401 as fuel to calcine limestone to produce carbon dioxide and calcium oxide. The calcium-based energy storage device 4 reacts calcium oxide with water through the calcium oxide digestion reactor 405 to produce calcium hydroxide and generate heat. The limestone calcining equipment 401 is provided with a hydrogen burner and uses the hydrogen inside the hydrogen storage tank 202 as fuel to calcine the calcium carbonate added to the limestone calcining equipment 401 to produce carbon dioxide and calcium oxide, wherein the carbon dioxide is transported to the hydrogenation methanol production device 3, and the calcium oxide is added to the inside of the calcium oxide digestion reactor 405 to react with water to produce calcium hydroxide. The screening device 409 filters the calcium hydroxide, and the high-specific surface area calcium hydroxide is stored as a chemical product. The calcium-based energy storage device 4 transfers the heat to the water through heat exchange for reuse.

[0026] Among them, the top air outlet of the calcium oxide digestion reactor 405 is connected to the second fan 410, the air outlet of the second fan 410 is connected to the second dust collector 411, the outlet of the second dust collector 411 is connected to the first heat exchanger 412, the first heat exchanger 412 is connected to the hot water storage tank 413 through a conduit, and the water outlet of the hot water storage tank 413 is connected to the user 404 through a conduit. The calcium oxide inside the calcium oxide digestion reactor 405 reacts with water to produce a large amount of water vapor. The second fan 410 draws the water vapor into the second dust collector 411 for impurities removal and then enters the first heat exchanger 412 for heat exchange. Part of it circulates with the user 404 through the conduit for reuse, or is sent to the hot water storage tank 413 for storage.

[0027] Among them, the rotary kiln 406 is divided into a preheating section and a reaction section, the waste outlet of the screening equipment 409 is connected to the preheating section of the rotary kiln 406, and the reaction section of the rotary kiln 406 is connected to the discharge port of the limestone calcining equipment 401. The side of the rotary kiln 406 is provided with a first fan 407, a first dust collector 408 and a second heat exchanger 415. The rotary kiln 406 is intermittent according to the length of light exposure. After a single reaction is completed, a large amount of residual heat energy of the material and equipment is replaced by the first fan 407, the first dust collector 408 and the second heat exchanger 415, and converted into hot water for heating, so as to maximize heat recovery and reduce energy waste. The calcium oxide digestion reactor 405 re-calcines the calcium hydroxide that does not meet the use requirements after being filtered by the screening equipment 409 to produce calcium oxide, which is combined with the calcium oxide produced by the limestone calcining equipment 401 as a raw material for producing calcium hydroxide.

[0028] Among them, a first remote thermometer 402 is provided at the top of the limestone calcining equipment 401 to detect the internal temperature of the limestone calcining equipment 401 in real time. A flow meter 205 and a regulating control valve 204 are provided between the hydrogen storage tank 202 and the limestone calcining equipment 401. A second remote thermometer 414 is provided between the user 404 and the hot water storage tank 413. The opening of the regulating control valve 204 is adjusted by reading the flow meter 205 to control the flow of hydrogen entering the limestone calcining equipment 401, thereby controlling the temperature of the reaction section in the limestone calcining equipment 401 to be between 1000°C and 1200°C. In addition, the calcium content of the raw limestone, the reaction time and the amount of mixed catalyst are controlled to ensure that the reaction generates active calcium oxide.

[0029] The working principle of the present invention is as follows: in the light energy conversion stage, the photovoltaic modules 101 connected in series with wires receive sunlight and convert solar energy into electrical energy, part of which is converted into alternating current through the inverter 104 to power other devices, and part of the direct current is transmitted to the battery pack 102 for storage; in the electrical energy conversion stage, the direct current of the battery pack 102 enters the electrolytic cell 201 to electrolyze water, the oxygen generated by the anode is removed by the oxygen purification device 203 and then enters the oxygen storage tank 206 for storage, and the hydrogen generated by the cathode is sent to the hydrogen storage tank 202 for storage; in the chemical energy conversion stage, the flow meter 205 reads the readings. The opening of the regulating control valve 204 is adjusted so that the hydrogen in the hydrogen storage tank 202 enters the limestone calcining equipment 401 at a certain speed. The hydrogen burner of the limestone calcining equipment 401 is operated to heat the limestone calcining equipment 401 so that the temperature in the limestone calcining equipment 401 is between 1000°C and 1200°C. Limestone is poured into the limestone calcining equipment 401 through the top feed port, thereby calcining the limestone to produce carbon dioxide and calcium oxide. The carbon dioxide and part of the hydrogen in the hydrogen storage tank 202 enter the methanol reactor 301, and methanol is synthesized under the action of high temperature and catalyst. Liquid methanol is transported to the methanol storage tank 302 for storage. Calcium oxide is added to the calcium oxide digestion reactor 405 to react with water to produce calcium hydroxide. Screening equipment 409 filters the calcium hydroxide. High-specificity calcium hydroxide is stored as a chemical product. Calcium hydroxide that does not meet the use requirements after filtering by screening equipment 409 enters the calcium oxide digestion reactor 405 and is calcined again to produce calcium oxide. It is combined with calcium oxide produced by limestone calcination equipment 401 as a raw material for producing calcium hydroxide. Heat is recovered. Calcium oxide in the calcium oxide digestion reactor 405 reacts with water. A large amount of water vapor is generated. The second fan 410 draws the water vapor into the second dust collector 411 for impurities removal and then enters the first heat exchanger 412 for heat exchange. Part of it circulates with the user 404 through the conduit for reuse, or is sent to the hot water storage tank 413 for storage. The rotary kiln 406 is intermittent according to the length of the lighting. After a single reaction is completed, the first fan 407, the first dust collector 408 and the second heat exchanger 415 replace the large amount of residual heat energy of the materials and equipment and convert it into hot water for heating, thereby maximizing heat recovery and reducing energy waste.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ultra-long-term energy storage system for converting solar energy into chemical energy, comprising a photovoltaic power generation device (1), characterized in that: Also includes: A water electrolysis hydrogen production device (2), a hydrogenation methanol production device (3) and a calcium-based energy storage device (4), wherein the water electrolysis hydrogen production device (2) is connected to a photovoltaic power generation device (1) via a conductor, and uses the photovoltaic power generation device (1) to generate electricity for water electrolysis reaction to generate hydrogen and oxygen; the calcium-based energy storage device (4) is connected to the water electrolysis hydrogen production device (2) via a conduit, and uses the hydrogen generated by the water electrolysis hydrogen production device (2) as fuel to calcine limestone to generate carbon dioxide and calcium oxide; the hydrogenation methanol production device (3) is connected to the water electrolysis hydrogen production device (2) via a conduit, and uses the water electrolysis hydrogen production device (2) to electrolyze water to generate hydrogen and the calcium-based energy storage device (4) to generate carbon dioxide as raw materials to generate liquid methanol for storage; the calcium-based energy storage device (4) generates heat by reacting the calcium oxide generated by calcination with water to heat water for residents to use, and generates calcium hydroxide as an energy storage material.

2. The ultra-long-term energy storage system for converting solar energy into chemical energy according to claim 1, characterized in that: The photovoltaic power generation device (1) comprises a photovoltaic module (101), a battery pack (102), an electric device (103) and an inverter (104). The photovoltaic module (101) is composed of solar cells connected in series via wires. The photovoltaic module (101) is connected to the inverter (104) via wires to convert direct current into alternating current to supply power to the electric device (103). The photovoltaic module (101) is connected to the battery pack (102) via wires to store electrical energy and supply power to the water electrolysis hydrogen production device (2).

3. The ultra-long-term energy storage system for converting solar energy into chemical energy according to claim 2, characterized in that: The water electrolysis hydrogen production device (2) comprises an electrolytic cell (201), a hydrogen storage tank (202), an oxygen purification device (203) and an oxygen storage tank (206); the oxygen purification device (203) is connected to the battery pack (102) via a wire; an ion exchange membrane is provided at the center of the electrolytic cell (201) to divide the electrolytic cell (201) into a cathode and an anode; a water injection pipe is installed on the top of the electrolytic cell (201); the air inlet of the oxygen purification device (203) is connected to the anode of the electrolytic cell (201) via the oxygen purification device (203); and the air inlet of the hydrogen storage tank (202) is connected to the cathode of the electrolytic cell (201).

4. The ultra-long-term energy storage system for converting solar energy into chemical energy according to claim 3, characterized in that: The calcium-based energy storage device (4) includes a limestone calcining device (401), a calcium oxide digestion reactor (405) and a rotary kiln (406). The hydrogenation methanol device (3) includes a methanol reactor (301) and a methanol storage tank (302). The feed port of the methanol storage tank (302) is connected to the discharge port of the methanol reactor (301). The top of the limestone calcining device (401) is provided with a limestone inlet. The air inlet of the limestone calcining device (401) is connected to the air outlet of the hydrogen storage tank (202) through a conduit. The air outlet of the limestone calcining device (401) is connected to the air inlet of the methanol reactor (301) through a conduit. The feed port of the methanol storage tank (302) is connected to the air outlet of the hydrogen storage tank (202). The discharge port of the gas storage tank (202) is connected, a carbon dioxide purification device (403) is provided between the methanol reactor (301) and the limestone calcining device (401), the discharge port of the limestone calcining device (401) is connected to the feed port of the calcium oxide digestion reactor (405) through a conduit, and the discharge port of the calcium oxide digestion reactor (405) is connected to a screening device (409), the calcium-based energy storage device (4) generates hydrogen as fuel by using the electrolytic water hydrogen production device (2) through the limestone calcining device (401) to calcine limestone to generate carbon dioxide and calcium oxide, and the calcium-based energy storage device (4) generates calcium hydroxide and heat by reacting calcium oxide with water in the calcium oxide digestion reactor (405).

5. The ultra-long-term energy storage system for converting solar energy into chemical energy according to claim 4, characterized in that: The top air outlet of the calcium oxide digestion reactor (405) is connected to a second fan (410), the air outlet of the second fan (410) is connected to a second dust collector (411), the outlet of the second dust collector (411) is connected to a first heat exchanger (412), the first heat exchanger (412) is connected to a hot water storage tank (413) via a conduit, and the water outlet of the hot water storage tank (413) is connected to a user (404) via a conduit.

6. The ultra-long-term energy storage system for converting solar energy into chemical energy according to claim 5, characterized in that: The rotary kiln (406) is divided into a preheating section and a reaction section. The waste outlet of the screening device (409) is connected to the preheating section of the rotary kiln (406). The reaction section of the rotary kiln (406) is connected to the discharge port of the limestone calcining device (401). A first fan (407), a first dust collector (408) and a second heat exchanger (415) are provided on the side of the rotary kiln (406). The rotary kiln (406) is intermittent according to the duration of light exposure. After a single reaction is completed, a large amount of residual heat energy of the material and equipment is replaced by the first fan (407), the first dust collector (408) and the second heat exchanger (415) and converted into hot water for heating, thereby recovering heat to the greatest extent and reducing energy waste.

7. The ultra-long-term energy storage system for converting solar energy into chemical energy according to claim 5, characterized in that: A first remote thermometer (402) is provided at the top of the limestone calcining equipment (401), a flow meter (205) and a regulating control valve (204) are provided between the hydrogen storage tank (202) and the limestone calcining equipment (401), and a second remote thermometer (414) is provided between the user (404) and the hot water storage tank (413).

Images