A CaCO3 cross-seasonal heat storage system based on cascade heat storage and segmented application

Abstract

The present invention belongs to the technical field of cross-seasonal heat storage, and particularly relates to a CaCO₃ cross-seasonal heat storage system based on cascaded heat storage and segmented application, which includes a CaCO₃ calcination and decomposition device, a solar water heat storage device, and a mixed reaction heat release device; the CaCO₃ calcination device operates in the summer: the tower-type solar collector collects high-temperature heat, and the heat is introduced into the CaCO₃ calciner to decompose CaCO₃ into CaO and CO₂. Among them, the solid CaO is stored in the CaO storage device, and the high-temperature CO₂ gas generated by the calcination is introduced into the hierarchical heat storage device to store the high-temperature thermal energy in a cascaded manner, and then the CO₂ is stored; the solar water heat storage process occurs during the summer: the normal-temperature water at the bottom of the water-type heat storage device enters the vacuum tube solar collector, is heated to the heat storage temperature, and then returns to the top of the water-type heat storage device to complete the solar water heat storage process. The present invention combines solar heat collection technology, the thermal chemical reaction of calcium carbonate, and thermal energy storage technology, and can achieve the efficient utilization and storage of solar energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of cross-seasonal heat storage, and particularly relates to a CaCO3 cross-seasonal heat storage system based on cascaded heat storage and segmented application. Background Art

[0002] With the continuous growth of global energy demand and the increasing awareness of environmental protection, the development of renewable energy and efficient energy storage technologies has become increasingly important. Among various renewable energies, solar energy is a clean and infinitely available energy source, but its collection and storage have always been a challenge. Therefore, the development of an efficient and environmentally friendly solar energy storage technology has become a current research hotspot.

[0003] On the other hand, thermochemical reaction is a technology that converts thermal energy in chemical reactions into other forms of energy. Its greatest advantage is that it can store thermal energy and release it when needed. In thermochemical reactions, useful products can be prepared by utilizing the thermal effect of substances during the reaction process while storing energy.

[0004] Existing thermochemical heat storage mainly focuses on the liquid-solid phase thermochemical reactions of inorganic materials. Among hydroxide materials, compared with Mg(OH)2 (decomposition temperature is about 330 °C), the decomposition temperature of Ca(OH)2 is higher (400 - 600 °C), which is expected to increase the applicable temperature range of heat storage. Taking the CaO / Ca(OH)2 reaction as an example, there are problems such as material caking, and the temperature range for the reaction involving water vapor is 700 - 1000 °C. Among them, the reaction kinetics of MgO / MgCO3 is poor, and PbO / PbCO3 is toxic, which are restricted in large-scale research and application. While the heat storage density of the CaO / CaCO3 reaction can reach 0.39 kWh / kg (1 kWh = 3600000 J), it not only has broad application prospects in the concentrating solar power (CSP) system but also has advantages in the energy-coupled utilization of carbon dioxide capture.

[0005] Therefore, it is necessary for this application to provide a CaCO3 cross-seasonal heat storage system based on cascaded heat storage and segmented application to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0006] Based on the above deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a CaCO3 cross-seasonal heat storage system based on cascaded heat storage and segmented application. This system combines solar energy collection technology, the thermochemical reaction of calcium carbonate, and heat energy storage technology, and can achieve the efficient utilization and storage of solar energy, providing a new solution to solve the problems of solar energy storage and utilization.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A CaCO3 cross-seasonal heat storage system based on cascade heat storage and segmented application, comprising a CaCO3 calcination and decomposition device, a solar water heat storage device, and a hybrid reaction heat release device;

[0009] The CaCO3 calcination and decomposition device uses a tower-type solar collector to collect high-temperature heat, and passes it into a CaCO3 calciner to decompose CaCO3 into CaO and CO2; the high-temperature CO2 gas generated by calcination is passed into a hierarchical heat storage device to store the high-temperature heat energy in a cascade manner, and then the CO2 is stored;

[0010] The solar water heat storage device is used to send the normal-temperature water at the bottom of the water body heat storage device into a vacuum tube solar collector, heat it to the heat storage temperature, and then return it to the top of the water body heat storage device to complete the solar water heat storage;

[0011] The hybrid reaction heat release device is used to react CaO with the water generated by the solar water heat storage device to generate Ca(OH)2, realizing the first heat release of thermochemical energy, and then passing CO2 gas into the Ca(OH)2 solution to react to produce CaCO3, realizing the second heat release of thermochemical energy, and finally releasing the stored thermochemical energy, and transferring the heat to the water body during the heating season of users through indirect heat exchange to realize cross-season heating.

[0012] Further, the CaCO3 calcination and decomposition device includes a tower-type solar collector, a CaCO3 calciner, a CaO storage, a hierarchical heat storage device, a CO2 inlet valve, and a CO2 storage tank;

[0013] The outlet of the tower-type solar collector is connected to the inlet of the CaCO3 calciner, the first outlet of the CaCO3 calciner is connected to the inlet of the hierarchical heat storage device, the outlet of the hierarchical heat storage device is connected to the inlet of the CO2 storage tank, a CO2 inlet valve is provided between the hierarchical heat storage device and the CO2 storage tank, and the second outlet of the CaCO3 calciner is connected to the inlet of the CaO storage.

[0014] Further, the heat storage temperature of the hierarchical heat storage device is 50°C - 700°C.

[0015] Further, the solar water heat storage device includes a water body heat storage device, a vacuum tube solar collector, a first valve, a first water pump, and a second valve;

[0016] The first water outlet at the bottom of the water body heat storage device is connected to the water inlet of the vacuum tube solar collector through the second valve, the first water pump, and the water inlet of the vacuum tube solar collector; the water outlet of the vacuum tube solar collector is connected to the first water inlet at the top of the water body heat storage device through the first valve.

[0017] Furthermore, the hybrid reaction heat release device includes a third valve, a second water pump, a CaO storage tank, a hybrid reactor, a CaO reaction chamber, a Ca(OH)2 reaction chamber, a CO2 storage tank, a CO2 exhaust valve, a water body heat storage device, a third valve, a second water pump, a fourth valve, a CaCO3 filter, a fifth valve, a third water pump, a user-side water pump, a seventh valve, a user, and a CO2 booster;

[0018] The solid outlet of the CaO storage tank is connected to the solid inlet of the CaO reaction chamber of the hybrid reactor;

[0019] The second water outlet of the water body heat storage device is connected to the water inlet of the CaO reaction chamber of the hybrid reactor through a third valve and a second water pump; the water outlet of the CaO reaction chamber of the hybrid reactor is connected to the water inlet of the Ca(OH)2 reaction chamber of the hybrid reactor;

[0020] The water outlet of the Ca(OH)2 reaction chamber of the hybrid reactor is connected to the water inlet of the CaCO3 filter through a fourth valve, and the water outlet of the CaCO3 filter is connected to the second water inlet of the water body heat storage device through a fifth valve and a third water pump;

[0021] The gas outlet of the CO2 storage tank is connected to the gas inlet of the CO2 booster through a CO2 exhaust valve, and the gas outlet of the CO2 booster is connected to the gas inlet of the Ca(OH)2 reaction chamber of the hybrid reactor.

[0022] Furthermore, the bottom of the CaO reaction chamber of the hybrid reactor is respectively provided with stirring blades and an electric motor, and the stirring blades are connected to the electric motor.

[0023] The present invention also provides a heat storage method for a CaCO3 cross-seasonal heat storage system based on cascade heat storage and segmented application. The heat storage system as described above is adopted, including a CaCO3 calcination and decomposition process, a solar water body heat storage process, and a hybrid reaction heat release process;

[0024] The CaCO3 calcination and decomposition process includes: in the summer period, high-temperature heat is collected by a solar collector and introduced into a CaCO3 calciner (2) to decompose CaCO3 into CaO and CO2;

[0025] After calcination, the CaO solid therein is stored in a CaO storage device;

[0026] The high-temperature CO2 gas generated after calcination is introduced into a hierarchical heat storage device to store the high-temperature thermal energy in a cascade manner, and then enters the CO2 storage tank through a CO2 inlet valve to store the CO2.

[0027] Further, the solar water body heat storage process includes: during summer, the normal temperature water at the first water outlet of the water body type heat storage device enters the vacuum tube solar collector through the second valve and the first water pump, and is heated to the heat storage temperature by the vacuum tube solar collector;

[0028] The hot water heated to the heat storage temperature flows out from the water outlet of the vacuum tube solar collector, and enters the water body type heat storage device through the first valve from the first water inlet of the water body type heat storage device, completing the solar water body heat storage process.

[0029] Further, the hybrid reaction heat release process includes: during the heating season, the second water outlet of the water body type heat storage device is opened, and the stored hot water body flows into the CaO reaction chamber of the hybrid reactor through the third valve and the second water pump; at the same time, the CaO solid in the CaO storage tank is added into the CaO reaction chamber of the hybrid reactor, and the CaO solid reacts with water to generate Ca(OH)2 solution. Meanwhile, the electric motor drives the stirring blades to fully stir the solution, and after sufficient reaction, the first heat release occurs to increase the temperature of the water body; the generated Ca(OH)2 solution after reaction enters the reaction chamber of Ca(OH)2 of the hybrid reactor from the right channel;

[0030] Through the CO2 supercharger, CO2 gas is introduced into the reaction chamber of Ca(OH)2 of the hybrid reactor, so that CO2 reacts with Ca(OH)2 to produce CaCO3 for the second heat release, and the reaction water body is heated to the heating temperature through two heat releases;

[0031] The sixth valve and the seventh valve are opened, and the user side water pump is started. The user side return water absorbs heat from the hybrid reactor through indirect heat exchange, and the temperature rises to the heating temperature for supplying heating to users;

[0032] The unreacted water at the bottom of the hybrid reactor enters the CaCO3 filter through the fourth valve, the fifth valve and the third water pump to remove the CaCO3 particles in the water, and then returns to the water body type heat storage device to wait for use in the next heating season.

[0033] Therefore, compared with the prior art, a CaCO3 seasonal heat storage system based on cascade heat storage and segmented application provided by the present invention has at least the following beneficial effects:

[0034] 1. The present invention utilizes solar heat collection technology, reversible thermochemical reaction of calcium carbonate and thermal energy hierarchical storage technology to achieve efficient utilization and storage of solar energy.

[0035] 2. The present invention adopts the technical scheme of cascade heat storage and segmented application, making the storage and utilization of energy more efficient.

[0036] 3. The present invention utilizes the thermochemical reaction of CaCO3, releasing heat through two chemical reactions, avoiding high-temperature conditions, and achieving secondary heat release of thermochemical energy.

[0037] 4. The present invention utilizes an efficient and environmentally friendly energy storage method, which can effectively solve the problems of solar energy storage and utilization.

[0038] The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following is a detailed description in conjunction with preferred embodiments and accompanied by drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0040] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 It is a schematic diagram of the structure of the mixing reactor in the present invention.

[0042] In the figure:

[0043] 1 - Tower solar collector, 2 - CaCO3 calciner, 3 - CaO storage, 4 - Mixing reactor, 4 - 1 - CaO reaction chamber, 4 - 2 - Ca(OH)2 reaction chamber, 5 - Hierarchical heat storage, 6 - CO2 inlet valve, 7 - CO2 storage tank, 8 - CO2 exhaust valve, 9 - Vacuum tube solar collector, 10 - First valve, 11 - First water pump, 12 - Second valve, 13 - Water body heat storage, 14 - Third valve, 15 - Second water pump, 16 - Fourth valve, 17 - CaCO3 filter, 18 - Fifth valve, 19 - Third water pump, 20 - Sixth valve, 21 - User-side water pump, 22 - Seventh valve, 23 - User, 24 - CO2 booster, 25 - Stirring blade, 26 - Motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The following will describe in detail the specific embodiments of the present invention in conjunction with the drawings. As a part of this specification, the principles of the present invention are illustrated through embodiments, and other aspects, features, and advantages of the present invention will become clear at a glance through this detailed description. In the accompanying drawings referred to, the same or similar components in different figures are denoted by the same reference numerals.

[0045] Refer to Figure 1 - Figure 2, where solid lines represent the aqueous solution pipeline, CO2 gas pipeline, and CaO pipeline, and arrows represent the flow direction. A CaCO3 seasonal heat storage system based on cascaded heat storage and segmented application includes a CaCO3 calcination and decomposition device, a solar water heat storage device, and a hybrid reaction heat release device;

[0046] The CaCO3 calcination and decomposition device uses a tower-type solar collector 1 to collect high-temperature heat, and passes it into a CaCO3 calciner 2 to decompose CaCO3 into CaO and CO2; the high-temperature CO2 gas generated by the calcination is passed into a hierarchical heat storage device to store the high-temperature heat in a cascaded manner, and then the CO2 is stored;

[0047] The solar water heat storage device is used to let the normal-temperature water at the bottom of the water body heat storage device 13 enter the vacuum tube solar collector 9, be heated to the heat storage temperature, and then return to the top of the water body heat storage device 13 to complete the solar water heat storage;

[0048] The hybrid reaction heat release device is used to react CaO with the water generated by the solar water heat storage device to generate Ca(OH)2, realizing the first heat release of thermochemical energy, and then passing CO2 gas into the Ca(OH)2 solution to react to produce CaCO3, realizing the second heat release of thermochemical energy, and finally releasing the stored thermochemical energy, and transferring the heat to the water body in the user's heating season through indirect heat exchange to realize seasonal heating.

[0049] In an optional embodiment, the CaCO3 calcination and decomposition device includes a tower-type solar collector 1, a CaCO3 calciner 2, a CaO storage 3, a hierarchical heat storage device 5, a CO2 inlet valve 6, and a CO2 storage tank 7;

[0050] The outlet of the tower-type solar collector 1 is connected to the inlet of the CaCO3 calciner 2, the first outlet of the CaCO3 calciner 2 is connected to the inlet of the hierarchical heat storage device 5, the outlet of the hierarchical heat storage device 5 is connected to the inlet of the CO2 storage tank 7, a CO2 inlet valve 6 is provided between the hierarchical heat storage device 5 and the CO2 storage tank 7, and the second outlet of the CaCO3 calciner 2 is connected to the inlet of the CaO storage 3.

[0051] In the above embodiment, the high-temperature calcination temperature in the CaCO3 calciner 2 is 800 - 900 °C, and the calcination is carried out in batches.

[0052] In the above embodiment, the heat storage temperature of the hierarchical heat storage device 5 is 50 °C - 700 °C. Here, the hierarchical heat storage device 5 is divided into five levels of heat storage, and the heat storage temperatures are, from high to low in turn, 700 °C, 500 °C, 300 °C, 100 °C, 50 °C; and the heat in the hierarchical heat storage device 5 can be used as a mobile heat source; among them, the CO2 storage tank 7 is stored at normal temperature and pressure.

[0053] In an alternative embodiment, the solar water heat storage device includes a water body heat storage device 13, a vacuum tube solar collector 9, a first valve 10, a first water pump 11, and a second valve 12;

[0054] The first water outlet at the bottom of the water body heat storage device 13 is connected to the water inlet of the vacuum tube solar collector 9 through the second valve 12, the first water pump 11; the water outlet of the vacuum tube solar collector 9 is connected to the first water inlet at the top of the water body heat storage device 13 through the first valve 10.

[0055] In the above embodiment, the temperature of the normal temperature water is 25 °C, and the temperature reaches 60 °C after being heated by the vacuum tube solar collector 9.

[0056] In the above embodiment, through temperature detection, the stored hot water body will be continuously heated to ensure that the average temperature of the stored hot water body is about 50 °C.

[0057] In an alternative embodiment, the hybrid reaction heat release device includes a third valve 14, a second water pump 15, a CaO storage tank 3, a mixing reactor 4, a CaO reaction chamber 4-1, a Ca(OH)2 reaction chamber 4-2, a CO2 storage tank 7, a CO2 exhaust valve 8, a water body heat storage device 13, a third valve 14, a second water pump 15, a fourth valve 16, a CaCO3 filter 17, a fifth valve 18, a third water pump 19, a sixth valve 20, a user-side water pump 21, a seventh valve 22, a user 23, and a CO2 booster 24;

[0058] The solid outlet of the CaO storage tank 3 is connected to the solid inlet of the CaO reaction chamber 4-1 of the mixing reactor 4;

[0059] The second water outlet of the water body heat storage device 13 is connected to the water inlet of the CaO reaction chamber 4-1 of the mixing reactor 4 through the third valve 14 and the second water pump 15; the water outlet of the CaO reaction chamber 4-1 of the mixing reactor 4 is connected to the water inlet of the Ca(OH)2 reaction chamber 4-2 of the mixing reactor 4;

[0060] The water outlet of the Ca(OH)2 reaction chamber 4-2 of the mixing reactor 4 is connected to the water inlet of the CaCO3 filter 17 through the fourth valve 16, and the water outlet of the CaCO3 filter 17 is connected to the second water inlet of the water body heat storage device 13 through the fifth valve 18 and the third water pump 19;

[0061] The gas outlet of the CO2 storage tank 7 is connected to the gas inlet of the CO2 booster 24 through the CO2 exhaust valve 8, and the gas outlet of the CO2 booster 24 is connected to the gas inlet of the Ca(OH)2 reaction chamber 4-2 of the mixing reactor 4.

[0062] In the above embodiments, stirring blades 25 and a motor 26 are respectively provided at the bottom of the CaO reaction chamber 4-1 of the mixing reactor 4, and the stirring blades 25 are connected to the motor 26; here, the motor 26 drives the stirring blades 25 to fully stir CaO and water, so that they react fully.

[0063] In the above embodiments, the pressure at the outlet of the CO2 supercharger 24 is about 3 atmospheres. CO2 enters the Ca(OH)2 reaction chamber 4-2 of the mixing reactor 4 in the form of a jet and reacts fully with the Ca(OH)2 solution.

[0064] In the above embodiments, the inlet water temperature of the mixing reactor 4 is 45°C, the temperature of the CaO reaction chamber 4-1 of the mixing reactor 4 is maintained at 60°C, and the temperature of the Ca(OH)2 reaction chamber 4-2 of the mixing reactor 4 is maintained at 65°C.

[0065] In the above embodiments, the user absorbs heat from the mixing reactor 4 by means of indirect heat exchange. In the indirect heat exchange, the inlet temperature of the heat medium is 40°C, the outlet temperature is 60°C, and the heat exchange efficiency is about 80% - 90%.

[0066] In an alternative embodiment, a heat storage method for a CaCO3 seasonal heat storage system based on cascaded heat storage and segmented application uses the heat storage system as described above, including the CaCO3 calcination and decomposition process, the solar water body heat storage process, and the mixing reaction heat release process;

[0067] The CaCO3 calcination and decomposition process includes: in the summer period, using the solar collector 1 to collect high-temperature heat, and introducing it into the CaCO3 calciner 2 to decompose CaCO3 into CaO and CO2;

[0068] After calcination, the CaO solid therein is stored in the CaO storage 3;

[0069] The high-temperature CO2 gas generated after calcination is introduced into the hierarchical heat storage 5 to store the high-temperature heat in a cascaded manner, and then enters the CO2 storage tank 7 through the CO2 inlet valve 6 to store the CO2.

[0070] Among them, the solar water body heat storage process includes: during the summer, the normal-temperature water at the first water outlet of the water body heat storage 13 enters the vacuum tube solar collector 9 through the second valve 12 and the first water pump 11, and is heated to the heat storage temperature by the vacuum tube solar collector 9;

[0071] The hot water heated to the heat storage temperature flows out from the water outlet of the vacuum tube solar collector 9 and enters the water body heat storage 13 through the first valve 10 from the first water inlet of the water body heat storage 13, completing the solar water body heat storage process.

[0072] Among them, the exothermic process of the hybrid reaction includes: during the heating season, the second water outlet of the water body type heat storage device 13 is opened, and the stored hot water flows into the CaO reaction chamber 4-1 of the hybrid reactor 4 through the third valve 14 and the second water pump 15; at the same time, the CaO solid in the CaO storage tank 3 is added into the CaO reaction chamber 4-1 of the hybrid reactor 4, so that the CaO solid reacts with water to generate a Ca(OH)2 solution. At the same time, the motor 26 drives the stirring blade 25 to fully stir the solution. After sufficient reaction, the first heat release occurs to increase the temperature of the water body; the generated Ca(OH)2 solution after the reaction enters the reaction chamber 4-2 of Ca(OH)2 in the hybrid reactor through the right channel;

[0073] Through the CO2 supercharger, CO2 gas is introduced into the reaction chamber 4-2 of Ca(OH)2 in the hybrid reactor, so that CO2 reacts with Ca(OH)2 to produce CaCO3 for the second heat release. Through the two heat releases, the reaction water body is heated to the heating temperature;

[0074] Open the sixth valve 20 and the seventh valve 22, start the user-side water pump 21, and the user-side return water absorbs heat from the hybrid reactor 4 through indirect heat exchange, and the temperature rises to the heating temperature and is supplied to the user 23 for heating;

[0075] The unreacted water at the bottom of the hybrid reactor 4 enters the CaCO3 filter 17 through the fourth valve 16, the fifth valve 18 and the third water pump 19 to remove the CaCO3 particles in the water, and then returns to the water body type heat storage device 13 to wait for use in the next heating season.

[0076] In an embodiment of the present invention, the tower solar collector 1 is used to collect high-temperature heat. Through calculation, about 60% is used for the hierarchical heat storage device, about 30% is used for user heating, and about 10% of the heat is dissipated. In the solar water body heat storage process, 60% of the heat is used for user heating and 40% of the heat is dissipated.

[0077] In summary, the present invention combines solar heat collection technology, the thermochemical reaction of calcium carbonate and heat energy storage technology, can realize the efficient utilization and storage of solar energy, and provides a new solution for solving the problems of solar energy storage and utilization.

[0078] The above is the preferred implementation manner of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and changes can still be made, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A CaCO3 cross-seasonal heat storage system based on cascade heat storage and segmented application, characterized in that, It includes a CaCO3 calcination and decomposition device, a solar water body heat storage device, and a hybrid reaction heat release device; For the CaCO3 calcination and decomposition device, a tower-type solar collector (1) is used to collect high-temperature heat, which is introduced into a CaCO3 calciner (2) to decompose CaCO3 into CaO and CO2; the high-temperature CO2 gas generated by the calcination is introduced into a hierarchical heat storage device to store the high-temperature heat in a stepped manner, and then the CO2 is stored; The solar water body heat storage device is used to send the normal-temperature water at the bottom of the water body heat storage device (13) into a vacuum tube solar collector (9), heat it to the heat storage temperature, and then return it to the top of the water body heat storage device (13) to complete the solar water body heat storage; The hybrid reaction heat release device is used to react CaO with the water generated by the solar water body heat storage device to generate Ca(OH)2, realizing the first heat release of thermochemical energy, and then introducing CO2 gas into the Ca(OH)2 solution to react to produce CaCO3, realizing the second heat release of thermochemical energy, finally releasing the stored thermochemical energy, and transferring the heat to the water body of the user during the heating season through indirect heat exchange to achieve cross-season heating; The CaCO3 calcination and decomposition device includes a tower-type solar collector (1), a CaCO3 calciner (2), a CaO storage tank (3), a hierarchical heat storage device (5), a CO2 inlet valve (6), and a CO2 storage tank (7); The outlet of the tower-type solar collector (1) is connected to the inlet of the CaCO3 calciner (2), the first outlet of the CaCO3 calciner (2) is connected to the inlet of the hierarchical heat storage device (5), the outlet of the hierarchical heat storage device (5) is connected to the inlet of the CO2 storage tank (7), a CO2 inlet valve (6) is provided between the hierarchical heat storage device (5) and the CO2 storage tank (7), and the second outlet of the CaCO3 calciner (2) is connected to the inlet of the CaO storage tank (3); The heat storage temperature of the hierarchical heat storage device (5) is 50°C - 700°C; The hybrid reaction heat release device includes a hybrid reactor (4), a CaO reaction chamber (4-1), a Ca(OH)2 reaction chamber (4-2), a CO2 exhaust valve (8), a fourth valve (16), a CaCO3 filter (17), a fifth valve (18), a third water pump (19), a sixth valve (20), a user-side water pump (21), a seventh valve (22), a user (23), and a CO2 booster (24); The solid outlet of the CaO storage tank (3) is connected to the solid inlet of the CaO reaction chamber (4-1) of the hybrid reactor (4); The second water outlet of the water body heat storage device (13) is connected to the water inlet of the CaO reaction chamber (4-1) of the hybrid reactor (4) through a third valve (14) and a second water pump (15); the water outlet of the CaO reaction chamber (4-1) of the hybrid reactor (4) is connected to the water inlet of the Ca(OH)2 reaction chamber (4-2) of the hybrid reactor (4); The water outlet of the Ca(OH)2 reaction chamber (4-2) of the mixing reactor (4) is connected to the water inlet of the CaCO3 filter (17) through the fourth valve (16), and the water outlet of the CaCO3 filter (17) is connected to the second water inlet of the water body heat storage device (13) through the fifth valve (18) and the third water pump (19); The gas outlet of the CO2 storage tank (7) is connected to the gas inlet of the CO2 booster (24) through the CO2 exhaust valve (8), and the gas outlet of the CO2 booster (24) is connected to the gas inlet of the Ca(OH)2 reaction chamber (4-2) of the mixing reactor (4).

2. The CaCO3 seasonal heat storage system based on cascade heat storage and segmented application according to claim 1, wherein The solar water heat storage device includes a water body heat storage device (13), a vacuum tube solar collector (9), a first valve (10), a first water pump (11) and a second valve (12); The first water outlet at the bottom of the water body heat storage device (13) is connected to the water inlet of the vacuum tube solar collector (9) through the second valve (12) and the first water pump (11); the water outlet of the vacuum tube solar collector (9) is connected to the first water inlet at the top of the water body heat storage device (13) through the first valve (10).

3. The CaCO3 seasonal heat storage system based on cascade heat storage and segmented application as claimed in claim 1, wherein The bottom of the CaO reaction chamber (4-1) of the mixing reactor (4) is respectively provided with stirring blades (25) and a motor (26), and the stirring blades (25) are connected to the motor (26).

4. A heat storage method for a CaCO3 seasonal heat storage system based on cascade heat storage and segmented application, using the heat storage system described in any one of claims 1-3, characterized in that, It includes the CaCO3 calcination and decomposition process, the solar water heat storage process and the mixing reaction heat release process; The CaCO3 calcination and decomposition process includes: in the summer period, using the tower solar collector (1) to collect high-temperature heat, and introducing it into the CaCO3 calciner (2) to decompose CaCO3 into CaO and CO2; After calcination, the CaO solid is stored in the CaO storage tank (3); The high-temperature CO2 gas generated after calcination is introduced into the hierarchical heat storage device (5) to store the high-temperature heat in a cascaded manner, and then enters the CO2 storage tank (7) through the CO2 inlet valve (6) to store CO2.

5. The heat storage method of a CaCO3 seasonal heat storage system based on cascade heat storage and segmented application according to claim 4, characterized in that, The solar water heat storage process includes: during the summer, the normal-temperature water at the first water outlet of the water body heat storage device (13) enters the vacuum tube solar collector (9) through the second valve (12) and the first water pump (11), and is heated to the heat storage temperature by the vacuum tube solar collector (9); The hot water heated to the heat storage temperature flows out from the water outlet of the vacuum tube solar collector (9), and flows into the water body heat storage device (13) through the first water inlet of the water body heat storage device (13) through the first valve (10), completing the solar water heat storage process.

6. The heat storage method of a CaCO3 seasonal heat storage system based on cascade heat storage and segmented application according to claim 5, characterized in that, The exothermic process of the hybrid reaction includes: during the heating season, the second outlet of the water-based heat storage device (13) is opened, and the stored hot water flows into the CaO reaction chamber (4-1) of the hybrid reactor (4) through the third valve (14) and the second water pump (15); at the same time, the CaO solid in the CaO storage tank (3) is added into the CaO reaction chamber (4-1) of the hybrid reactor (4), so that the CaO solid reacts with water to generate a Ca(OH)2 solution. Meanwhile, the motor (26) drives the stirring blades (25) to fully stir the solution. After sufficient reaction, the first exotherm occurs to raise the temperature of the water body; the generated Ca(OH)2 solution enters the reaction chamber (4-2) of Ca(OH)2 in the hybrid reactor through the right channel; Through the CO2 supercharger, CO2 gas is introduced into the reaction chamber (4-2) of Ca(OH)2 in the hybrid reactor, so that CO2 reacts with Ca(OH)2 to produce CaCO3 for the second exotherm. Through the two exotherms, the reaction water body is heated to the heating temperature; Open the sixth valve (20) and the seventh valve (22), start the user-side water pump (21), and the user-side return water absorbs heat from the hybrid reactor (4) through indirect heat exchange, and the temperature rises to the heating temperature and is supplied to the user (23) for heating; The unreacted water at the bottom of the hybrid reactor (4) enters the CaCO3 filter (17) through the fourth valve (16), the fifth valve (18) and the third water pump (19) to remove the CaCO3 particles in the water, and then returns to the water-based heat storage device (13) to wait for continued use in the next heating season.

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