A heat storage and release integrated modular Ca(OH)2 / CaO chemical heat storage device

Abstract

This invention belongs to the field of renewable energy storage and industrial waste heat peak-shaving storage technology. It discloses a modular Ca(OH)2 / CaO chemical thermal storage device integrating heat storage and release, comprising: a shell, an insulation layer, a hot water storage tank, a CaO heat release section unit, a Ca(OH)2 material feeding section unit, a thermal storage section unit, a CaO material lifting and circulation section, a steam generation unit, a sensing and detection component, an actuator valve group, and a controller. The CaO heat release section unit, Ca(OH)2 material feeding section unit, thermal storage section unit, and CaO material lifting and circulation section are interconnected to form a closed material circulation channel. The invention also discloses a corresponding modular Ca(OH)2 / CaO chemical thermal storage method integrating heat storage and release, avoiding complex material transportation and heat exchange, improving energy utilization efficiency and system reliability, avoiding continuous energy waste, achieving cascade utilization and stable output of thermal energy, realizing in-situ regeneration of raw materials and system self-maintenance. The modular and containerized design of the device provides a mobile and rapidly deployable temporary heat source solution, expanding the application scenarios of chemical energy storage.

Description

Technical Field

[0001] This invention relates to the fields of renewable energy storage and industrial waste heat peak shaving and thermal storage technology, specifically to a modular Ca(OH)2 / CaO chemical thermal storage device that integrates thermal storage and heat release, particularly to a chemical thermal storage device based on the reversible gas-solid reaction of Ca(OH)2 / CaO, which is especially suitable for modular, integrated, and mobile high-temperature chemical thermal storage devices and their supporting thermal storage operation processes. Background Technology

[0002] As the global energy structure continues its transition to renewable energy, and with the large-scale grid connection of intermittent energy sources such as wind and solar power, the peak-valley load difference in the power grid continues to widen. Industrial plants, field work sites, and temporary projects all have a demand for stable heating and off-peak electricity storage for peak shaving. Thermal energy storage technology has become a core technological route for balancing energy supply and demand and improving the overall energy utilization rate. Existing thermal energy storage technologies are divided into three categories: sensible heat storage, latent heat storage, and chemical reversible heat storage. Among them, chemical heat storage has the potential for large-scale application due to its advantages such as high heat storage density per unit volume / unit mass, no heat loss during long-term storage at room temperature, and long medium cycle life.

[0003] Among numerous reversible chemical reaction thermal storage systems, the reaction equation for the Ca(OH)₂ / CaO gas-solid reversible reaction system is: Ca(OH)₂ The system utilizes the process of CaO + H₂O - ΔH, where the forward dehydration process absorbs heat to achieve heat storage and the reverse hydration process releases heat to achieve heat release. The raw material for this system is limestone calcination product, which has abundant domestic reserves and low procurement costs. The reaction operating temperature range is moderate, the medium is non-toxic and non-corrosive, and the equipment operation produces no pollutant emissions. It is a key research system in the field of medium- and high-temperature chemical thermal energy storage.

[0004] Existing engineered Ca(OH)2 / CaO chemical thermal storage devices generally adopt a separate, modular structure, with the thermal storage dehydration reactor and the heat release and rehydration reactor arranged independently, equipped with independent heat sources, independent heat exchange tanks, and two complete material conveying mechanisms. This structure has several inherent technical defects: (1) The system has low integration, a large number of equipment, a large overall footprint, and high initial investment costs. The two reactors require a bucket elevator and a sealed conveying pipeline to transfer CaO and Ca(OH)2 particles. The material transfer process is subject to particle wear and leakage risks. At the same time, the material conveying and heat transfer process across equipment generates significant heat loss, which directly reduces the overall energy utilization efficiency of the system. (2) The reaction process lacks intelligent collaborative monitoring and control methods. Relying solely on manual timed start and stop of the heat source, it is impossible to determine the end point of the heat storage and release reaction in real time. If the heat source supply is stopped in advance, the reaction will be incomplete and the heat storage capacity of the medium will not be fully released. If the heat source is continuously supplied until the reaction is completed, it will result in continuous ineffective heat input, causing waste of off-peak electricity and steam heat source, resulting in poor operating economy. (3) The heat output form is singular. The high-temperature reaction heat generated by the hydration reaction has no matching buffer heat storage unit. The heat is used as soon as it is produced, and it is impossible to achieve heat energy buffering and cascade utilization. The heating stability is poor under the scenario of heat load fluctuation. (4) The regeneration of the medium depends on external transfer and processing. The Ca(OH)2 generated after a single heat release needs to be manually transferred to the thermal storage reactor. It cannot be dehydrated and regenerated in situ. The long-term operation process is complicated and the maintenance workload is large. (5) The equipment is fixed and installed on-site, using a split assembly mode. It cannot be standardized for mass production or transported in whole vehicles, making it difficult to adapt to temporary and mobile heating scenarios such as temporary construction sites, field exploration, and emergency heating, thus limiting its application scenarios.

[0005] Existing technologies lack integrated Ca(OH)2 / CaO chemical thermal storage devices that can integrate thermal storage and exothermic reactions into a single device in a closed loop, with intelligent reaction endpoint determination, in-situ medium recycling and regeneration, and modular and mobile deployment. At the same time, there is a lack of complete closed-loop chemical thermal storage processes adapted to integrated devices. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing separate Ca(OH)2 / CaO chemical thermal storage equipment systems, such as complex systems, large heat loss during material transport and heat exchange, lack of intelligent reaction determination, inability to regenerate the medium in situ, poor deployment flexibility, and inability to buffer and store thermal energy. This invention provides a modular Ca(OH)2 / CaO chemical thermal storage device and a matching chemical thermal storage method that integrates thermal storage and heat release.

[0007] The first aspect of the present invention is to provide a modular Ca(OH)2 / CaO chemical thermal storage device integrating thermal storage and release, characterized in that it comprises: a whole machine shell (29), a heat insulation layer, a hot water storage tank, a CaO heat release section unit (A), a Ca(OH)2 feeding section unit (B), a thermal storage section unit (C), a CaO feeding and circulation section (D), a steam generation unit, a sensing and detection component, an actuation valve group, and a controller (6); wherein: The CaO exothermic section (A), Ca(OH)2 feeding section (B), heat storage section (C), and CaO feeding and circulation section (D) are connected end to end to form a closed material circulation channel; The CaO exothermic section unit (A) consists of a cylindrical exothermic section cavity shell (22), a concentrically arranged hollow exothermic section feed auger (23), and an exothermic section feed motor (7); the hollow shaft of the hollow exothermic section feed auger (23) has steam delivery holes (26) evenly opened along the axial direction on its side wall; one end of the exothermic section feed auger (23) extends out of the exothermic section cavity shell (22) to connect to the exothermic section feed motor (7), and the other end is connected to the steam generator (20) via a pipeline; the exothermic section cavity shell (22) is completely submerged inside the water body of the hot water storage tank (21); an exothermic section exhaust pipe (3) connected to the atmosphere is opened at the end of the cavity. The Ca(OH)2 discharge section unit (B) connects the bottom of the heat release section and the inlet of the heat storage section. It consists of a Ca(OH)2 discharge pipe (28) and a Ca(OH)2 discharge section control valve (16) installed in the middle. The Ca(OH)2 discharge section control valve (16) is used to cut off the material falling channel and control the start and stop of the heat storage process. After the heat release is completed, the Ca(OH)2 generated falls into the heat storage section cavity by gravity. The thermal storage section unit (C) consists of a cylindrical thermal storage section cavity shell (12), a thermal storage section auger feeding device (13), a thermal storage section feeding motor (11), a spiral-wound thermal storage section electric heating tube (14), and a thermal storage section steam condenser tube (15). The thermal storage section auger feeding device (13), the thermal storage section electric heating tube (14), and the thermal storage section cavity shell (12) are arranged concentrically. The thermal storage section auger feeding device (13) pushes Ca(OH) 2. The particles are evenly spread throughout the cavity; the electric heating tube (14) of the heat storage section provides the reaction temperature and triggers the dehydration and decomposition of Ca(OH)2; the water vapor generated by the reaction is introduced into the spiral steam condenser tube (15) of the heat storage section, and the steam condenser tube (15) of the heat storage section is completely immersed in the interior of the hot water storage tank (21). The water vapor and the water in the hot water storage tank (21) exchange heat indirectly and condense into liquid water. The liquid water flows into the cold water collection pool (18) of the heat storage section for recycling and reuse. The CaO feeding circulation section (D) is located between the CaO exothermic section (A) and the heat storage section (C), and includes a CaO feeding channel (30), a CaO feeding section control valve (8), and a tubular chain wear-resistant hopper conveying mechanism (31). The CaO particles generated in the heat storage process are lifted to the inlet of the exothermic section through the tubular chain wear-resistant hopper conveying mechanism (31) to complete the medium circulation. The CaO feeding section control valve (8) is used to cut off the feeding channel and isolate the two reaction chambers. The actuator valve and sensor detection components are connected to the controller (6) via signal lines. The feed motor (7) of the heat release section and the feed motor (11) of the heat storage section are linked to the controller (6) via power supply lines.

[0008] Preferably, the steam generating unit includes a steam generator (20), a steam generator inlet valve (19), and an external inlet pipe (17); the inlet pipe (17) is divided into two water supply lines, one supplying water to the steam generator to prepare the steam required for the hydration reaction, and the other directly replenishing water to the hot water storage tank (21); the hot water storage tank (21) is equipped with a hot water storage tank safety valve (24), a hot water output pipe (2), and a hot water outlet valve (1) on its upper part; Preferably, the interior of the outer shell (29) is filled with aluminum silicate composite insulation cotton to form an insulation layer with a thickness of 80–150 mm, which covers the inner side of the heat release section cavity shell (22), the heat storage section cavity shell (12) and the outer shell (29) respectively, thereby reducing the heat loss of the equipment to the outside.

[0009] Preferably, the interior of the outer shell (29) is filled with aluminum silicate composite insulation cotton to form an insulation layer with a thickness of 80–150 mm, which covers the inner side of the heat release section cavity shell (22), the heat storage section cavity shell (12) and the outer shell (29) respectively, thereby reducing the heat loss of the equipment to the outside.

[0010] Preferably, the electric heating tube (14) of the heat storage section is an electric heating sleeve structure, which is spirally arranged around the outer periphery of the auger feeding device (13) of the heat storage section. The rated working temperature range of the heating tube is 400–600℃, and it is equipped with a temperature control protection module and a controller.

[0011] Preferably, the steam condenser tube (15) of the heat storage section is a 316L stainless steel spiral coil. The total heat exchange area of ​​the 316L stainless steel spiral coil is not less than the heat exchange requirement corresponding to the volume of the heat storage section cavity. The 316L stainless steel spiral coil is completely immersed in the water body of the hot water storage tank (21), and the water vapor exchanges heat and condenses indirectly with the water body of the hot water storage tank.

[0012] Preferably, the controller (6) has a built-in data acquisition module, a logic judgment module and an output drive module; the data acquisition module collects the detection values ​​of each temperature and pressure sensor in real time; the logic judgment module is configured with a reaction endpoint determination threshold, and outputs a shutdown command when the temperature and pressure data of the heat storage section continuously and stably reach the set time or the temperature and pressure of the heat release section and the water temperature of the hot water storage tank (21) reach the set threshold; the output drive module controls the opening and closing of each valve, the start and stop of the motor, the power supply of the heating pipe of the heat storage section, and the start and stop of the steam generator.

[0013] Preferably, the sensing and detection assembly fully covers both sections of the reaction chamber and the hot water storage tank (21), and consists of a temperature sensor (4) for the heat release section, a pressure sensor (5) for the heat release section, a temperature sensor (9) for the heat storage section, a pressure sensor (10) for the heat storage section, and a temperature sensor (27) for the hot water storage tank, for real-time acquisition of temperature and pressure data during the reaction process.

[0014] Preferably, the cold water collection tank (18) of the heat storage section is a closed pressurized water tank that collects the liquid water generated by condensation. The collection tank is reserved with a sewage outlet and a water supply interface, so as to be able to circulate and supply water to the steam generator.

[0015] The second aspect of the present invention relates to a chemical thermal storage method for a modular Ca(OH)2 / CaO chemical thermal storage device integrating thermal storage and heat release, comprising a device water filling preparation step, a thermal storage dehydration reaction step, and a heat release synthesis reaction step, wherein the medium circulates in a closed loop within the device throughout the entire process without the need for external transfer, including: S1, Equipment water filling preparation process, including: the controller (6) opens the hot water outlet valve (1), pressurized water source is injected into the hot water storage tank (21) through the water inlet pipe (17), the temperature sensor (27) of the hot water storage tank monitors the water level and water temperature in real time, and when the hot water storage tank (21) is full of water, the controller (6) automatically closes the hot water outlet valve (1) to complete the pre-preparation for heat storage and heat release; S2, thermal storage reaction process, including: S201, the controller (6) opens the control valve (16) of the Ca(OH)2 discharge section, and the Ca(OH)2 particles generated by the hydration reaction fall into the heat storage section cavity through the Ca(OH)2 discharge pipe (28) by gravity; the controller (6) starts the heat storage section feeding motor (11), and drives the heat storage section auger feeding device (13) to push the Ca(OH)2 particles at a uniform speed to fill the inside of the heat storage section cavity. After the material is filled, the auger stops running. S202, the controller (6) connects the power supply to the heating tube (14) of the heat storage section, the heating tube (14) of the heat storage section heats the Ca(OH)2 inside the cavity to 400–600℃, triggering the reversible dehydration reaction Ca(OH)2→CaO+H2O, and the reaction generates water vapor; the water vapor is introduced into the steam condenser (15) of the heat storage section, and exchanges heat with the water in the hot water storage tank (21) to condense into liquid water, and the condensate flows into the cold water collection pool (18) of the heat storage section. S203, the temperature sensor (9) and pressure sensor (10) of the heat storage section continuously collect temperature and pressure data inside the cavity, and the controller (6) compares the data with the preset stable threshold in real time; when the temperature and pressure data values ​​are continuously and stably maintained for 10-30 minutes without significant fluctuations, it is determined that the heat storage dehydration reaction is complete; the controller (6) cuts off the power supply to the heating tube (14) of the heat storage section and closes the control valve (16) of the Ca(OH)2 discharge section, and the heat storage process ends; S3, exothermic reaction process: S301, the controller (6) opens the CaO lifting section control valve (8), starts the tubular chain wear-resistant hopper transmission mechanism (31), and lifts the CaO particles generated in the heat storage process to the inlet of the heat release section unit; simultaneously starts the heat release section feeding motor (7), and the hollow heat release section feeding auger (23) pushes the CaO particles along the inside of the heat release section cavity at a uniform speed; S302, the controller (6) opens the water inlet valve (19) of the steam generator, and the water inlet supplies water to the steam generator (20) and generates saturated steam. The steam is introduced into the interior of the hollow heat release section feed auger (23) and is evenly released into the cavity through the steam conveying hole (26) of the heat release section. The steam comes into contact with CaO particles and undergoes a hydration exothermic reaction CaO+H2O→Ca(OH)2. The heat released by the reaction is transferred to the water in the hot water storage tank (21) that is submerged in the heat release section cavity, and the water is heated to form hot water that can be supplied externally. S303, the temperature sensor (4) and pressure sensor (5) of the heat release section collect the temperature and pressure inside the heat release chamber in real time, and the temperature sensor (27) of the hot water storage tank monitors the hot water temperature; when the water temperature of the hot water storage tank (21) reaches the set heating temperature, or the temperature and pressure values ​​of the heat release section are continuously stable for 10–30 min, it is determined that the CaO hydration reaction is complete; the controller (6) stops the steam generator (20), the feed motor (7) of the heat release section, and the pipe chain wear-resistant hopper transmission mechanism (31) in sequence, and closes the control valve (8) of the CaO lifting section, and the heat release process ends; S4, cyclic switching, includes: after the exothermic process is completed, the Ca(OH)2 material generated automatically falls into the Ca(OH)2 feeding section, and the S2 heat storage reaction process is repeated to realize the in-situ regeneration and circulation of the reactants. No external replenishment and / or replacement of the heat storage medium is required throughout the process.

[0016] The beneficial effects of the method and system of the present invention are as follows: 1. High integration and internal circulation: The two processes of heat storage (Ca(OH)2 dehydration) and heat release (CaO hydration) are creatively integrated into a single device, avoiding the complex material transportation and heat exchange processes of traditional separate systems. This simplifies the system structure, reduces equipment costs and heat loss during transmission, and achieves closed-loop circulation of reactants within the device, thereby improving energy utilization efficiency and system reliability.

[0017] 2. Intelligent Control and Energy Efficiency: The system uses a dedicated controller to monitor reaction parameters (such as temperature and pressure) in real time, accurately determine the completion status of heat storage or exothermic reactions, and automatically cut off the supply of external steam or reaction heat sources. This intelligent control effectively avoids continuous energy waste, prevents "over-reaction" or "under-reaction," and ensures the economic efficiency and accuracy of the equipment's operation.

[0018] 3. Cascaded utilization and stable output of thermal energy: The heat generated by the exothermic reaction is efficiently stored in an integrated hot water tank. This design not only achieves the immediate recovery and storage of reaction heat energy, but also converts high-grade chemical reaction heat into a stable and easy-to-use form of hot water, which can be directly supplied to users or used for subsequent purposes, realizing the cascaded and efficient management of thermal energy.

[0019] 4. In-situ regeneration of raw materials and self-maintenance of the system: The device has the capability of in-situ regeneration of raw materials. After the exothermic process is completed, the system can start the next thermal storage cycle by connecting to inexpensive energy sources such as off-peak electricity without replacing or adding new reactants, thereby regenerating Ca(OH)2. This achieves self-renewal and recycling of the reaction system, greatly reducing the maintenance costs and operational complexity of long-term operation.

[0020] 5. Modular Design and Flexible Deployment: The modular and containerized design of the device enables standardized production, convenient transportation, and rapid installation and commissioning. Each module can be arbitrarily combined and expanded according to actual heat load requirements, making it particularly suitable for temporary construction sites, emergency heating, field operations, and other temporary heat-demanding locations. It provides a mobile and rapidly deployable "temporary heat source" solution, greatly expanding the application scenarios of chemical thermal storage technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of a modular Ca(OH)2 / CaO chemical thermal storage device that integrates thermal storage and heat release, provided by existing technology. Figure 2 This is a schematic cross-sectional view of a modular Ca(OH)2 / CaO chemical thermal storage device integrating thermal storage and heat release, provided according to an embodiment of the present invention.

[0023] Figure label: 1. Hot water outlet valve; 2. Hot water output pipeline; 3. Exhaust pipe of the heat release section; 4. Temperature sensor of the heat release section; 5. Pressure sensor of the heat release section; 6. Controller; 7. Feed motor of the heat release section; 8. Control valve of the CaO lifting section; 9. Temperature sensor of the heat storage section; 10. Pressure sensor of the heat storage section; 11. Feed motor of the heat storage section; 12. Outer shell of the heat storage section; 13. Screw feed device of the heat storage section; 14. Heating pipe of the heat storage section; 15. Steam condenser pipe of the heat storage section; 16. Control valve of the Ca(OH)2 discharge section; 17. Water inlet pipe; 18. Cold water collection of the heat storage section. 19. Steam generator inlet valve; 20. Steam generator; 21. Hot water storage tank; 22. Outer shell of the heat release section cavity; 23. Feed auger of the heat release section; 24. Safety valve of the hot water storage tank; 25. Aluminum silicate insulation layer; 26. Steam conveying hole of the heat release section; 27. Temperature sensor of the hot water storage tank; 28. Ca(OH)2 discharge pipe; 29. ​​Outer shell of the whole machine; 30. CaO lifting channel; 31. Pipe chain wear-resistant hopper transmission mechanism; A. CaO heat release section unit; B. Ca(OH)2 discharge section unit; C. Heat storage section unit; D. CaO lifting circulation section. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The following embodiments and application embodiments solve the technical problems, including: (1) Eliminate material transport and heat transfer losses across equipment caused by the split dual reactor structure, simplify system pipelines and transmission structure, and reduce equipment manufacturing costs and floor space. (2) To achieve automatic identification of the endpoint of heat storage and heat release reactions, avoid ineffective continuous supply of heat source, and reduce equipment operating energy consumption; (3) An integrated hot water buffer storage unit converts the chemical heat of reaction into stable and outputtable atmospheric pressure hot water, realizing the cascade buffering utilization of thermal energy; (4) It realizes the closed-loop circulation and in-situ regeneration of CaO and Ca(OH)2 media inside the equipment, eliminating the need for manual transfer and external replenishment of media, thus reducing the workload of operation and maintenance; (5) It adopts container modular integrated packaging, supports standardized production, whole vehicle transportation, and rapid installation, and can be expanded by parallel connection of multiple units, adapting to temporary, mobile, and variable load heating scenarios; (6) Provide complete heat storage and heat release cycle processes for integrated equipment, standardize key operating parameters such as temperature and pressure judgment thresholds, heating temperature, and reaction time, and ensure sufficient reaction and stable system operation. Example 1

[0028] like Figure 1 As shown, this embodiment provides a modular Ca(OH)2 / CaO chemical thermal storage device integrating thermal storage and release, including: a complete shell, an insulation layer, a hot water storage tank, a CaO heat release section unit A, a Ca(OH)2 feeding section unit B, a thermal storage section unit C, a CaO feeding and circulation section D, a steam generation unit, a sensing and detection component, an actuator valve group, a drive motor group, and a controller 6; wherein: The outer shell 29 of the whole machine is filled with aluminum silicate composite insulation cotton to form an insulation layer. The CaO exothermic section unit A, Ca(OH)2 feeding section unit B, heat storage section unit C, and CaO feeding circulation section D are connected end to end to form a closed material circulation channel. The entire reaction process and material transfer are completed inside a single closed shell without the need for external conveying equipment. The CaO exothermic section unit A, as the core unit of the hydration exothermic reaction, consists of a cylindrical exothermic section cavity shell 22, a concentrically arranged hollow exothermic section feed auger 23, and an exothermic section feed motor 7. The hollow shaft of the hollow exothermic section feed auger 23 serves as a steam conveying channel, and the side wall is evenly opened with exothermic section steam conveying holes 26 along the axial direction, so that saturated water vapor can be evenly dispersed into the cavity to fully contact the CaO particles. One end of the exothermic section feed auger 23 extends out of the exothermic section cavity shell 22 to connect to the exothermic section feed motor 7, and the other end is connected to the steam generator 20. The exothermic section cavity shell 22 is completely immersed in the water body of the hot water storage tank 21, and the heat released by the reaction directly exchanges heat with the water body of the hot water storage tank 21. An exothermic section exhaust pipe 3 connected to the atmosphere is opened at the end of the cavity to balance the internal pressure of the cavity and discharge a small amount of uncondensed steam. The Ca(OH)2 discharge section unit B connects the bottom of the heat release section and the inlet of the heat storage section. It consists of a Ca(OH)2 discharge pipe 28 and a Ca(OH)2 discharge section control valve 16 installed in the middle. The Ca(OH)2 discharge section control valve 16 can completely cut off the material falling channel and realize the start and stop control of the heat storage process. After the heat release is completed, the Ca(OH)2 generated falls into the heat storage section cavity by gravity. The thermal storage section unit C, as the core unit of the dehydration thermal storage reaction, consists of a cylindrical thermal storage section cavity shell 12, a thermal storage section auger feeding device 13, a thermal storage section feeding motor 11, a spiral-shaped thermal storage section electric heating tube 14, and a 316L stainless steel spiral thermal storage section steam condenser tube 15. The thermal storage section auger feeding device 13, the thermal storage section electric heating tube 14, and the thermal storage section cavity shell 12 are arranged concentrically. The thermal storage section auger feeding device 13 pushes Ca(OH)2 particles to evenly spread throughout the cavity. The thermal storage section electric heating tube 14 provides a reaction temperature of 400–600℃, triggering the dehydration and decomposition of Ca(OH)2. The water vapor generated by the reaction is introduced into the spiral thermal storage section steam condenser tube 15. The thermal storage section steam condenser tube 15 is completely immersed in the interior of the hot water storage tank 21. The water vapor indirectly exchanges heat with the water in the hot water storage tank 21 and condenses into liquid water. The condensate is collected in the thermal storage section cold water collection pool 18 for recycling and reuse. The CaO feeding and circulation section D is arranged between the CaO exothermic section A and the heat storage section C, forming an upward channel for medium circulation. It includes a CaO feeding channel 30, a CaO feeding section control valve 8, and a lifting device (specifically a tubular chain wear-resistant hopper conveying mechanism 31). The CaO particles generated in the heat storage process are lifted to the inlet of the exothermic section via the tubular chain wear-resistant hopper conveying mechanism 31 to complete the medium circulation. The CaO feeding section control valve 8 is used to cut off the lifting channel and isolate the two reaction chambers. The steam generating unit includes a steam generator 20, a steam generator inlet valve 19, and an external inlet pipe 17. The inlet pipe 17 is divided into two water supply lines: one supplying water to the steam generator to prepare the steam required for the hydration reaction, and the other directly replenishing water to the hot water storage tank 21. The hot water storage tank 21 is equipped with a hot water storage tank safety valve 24, a hot water output pipe 2, and a hot water outlet valve 1, which can stably output atmospheric pressure hot water below 100℃ to users. The sensing and detection components fully cover the two reaction chambers and the hot water storage tank 21, including the temperature sensor 4 and pressure sensor 5 of the heat release section, the temperature sensor 9 of the heat storage section, the pressure sensor 10 of the heat storage section, and the temperature sensor 27 of the hot water storage tank, which collect temperature and pressure data of the reaction process in real time. All valves and sensors are connected to controller 6 via signal lines. The feed motor 7 in the exothermic section and the feed motor 11 in the heat storage section are linked to controller 6 via power supply lines. The controller has built-in data acquisition, logic judgment, and output drive modules. It presets the temperature and pressure stability threshold at the reaction endpoint and the heating temperature range. It can automatically determine the reaction completion status and cut off the heat source and stop the material conveying.

[0029] The entire unit adopts a containerized modular packaging, with a rated heat storage capacity of 50–500kWh per module. The outer wall of the module is equipped with standardized hoisting, water, and electrical interfaces. Multiple modules can be connected in parallel to match different heat loads. The inner side of the entire unit is covered with an 80–150mm thick aluminum silicate insulation layer to reduce the heat loss of the equipment.

[0030] Device Application Examples

[0031] This application example is a single-unit containerized modular integrated chemical thermal storage device with a rated thermal storage capacity of 200kWh. The standard dimensions of the external container are: 6000mm (length) × 2400mm (width) × 2600mm (height). The outer shell of the unit is 29mm thick and covered with 100mm thick aluminum silicate composite insulation cotton 25. The unit weighs approximately 7.2t and can be transported by road. The maximum heating power of a single module is 80kW, and the output hot water temperature range is 40–90℃.

[0032] (I) Key parameters of the CaO exothermic section unit (section A) The outer shell 22 of the heat release section cavity is made of 304 stainless steel cylinder with an inner diameter of 800mm and an effective length of 3200mm; the hollow heat release section feed auger 23 has a hollow shaft with an outer diameter of 120mm and a wall thickness of 8mm, and heat release section steam conveying holes 26 are opened at equal intervals along the auger axis, with a single hole diameter of 3mm and a spacing of 20mm between adjacent holes; the heat release section feed motor 7 has a rated power of 2.2kW, frequency conversion speed regulation, and a conveying rate of 0.8t / h; the outer shell of the heat release section cavity is completely submerged in the water body inside the hot water storage tank 21, with a submersion depth of 2100mm; the heat release section exhaust pipe 3 has a diameter of DN25 and is connected to the atmosphere to balance the cavity pressure; the heat release section temperature sensor 4 has a range of 0–300℃ and an accuracy of ±0.5℃; the heat release section pressure sensor 5 has a range of 0–0.3MPa and an accuracy of ±0.002MPa.

[0033] (II) Key parameters of Ca(OH)2 feeding section unit (section B) The Ca(OH)2 discharge pipe 28 has a diameter of DN150 and is arranged vertically. A pneumatic Ca(OH)2 discharge section control valve 16 is installed in the middle to completely cut off the discharge channel. The effective vertical height of the discharge pipe is 1100mm. The granular material falls naturally by gravity without any auxiliary conveying power.

[0034] (III) Key parameters of the thermal storage unit (Section C) The outer shell 12 of the thermal storage section cavity is a 304 stainless steel cylinder with an inner diameter of 800mm and an effective length of 3600mm; the auger feeding device 13 of the thermal storage section has an outer diameter of 700mm, and is equipped with a thermal storage section feeding motor 11 with a rated power of 3kW, frequency conversion speed regulation, and a conveying speed of 1t / h; the heating tube 14 of the thermal storage section is a spiral wound electric heating sleeve with a total heating power of 120kW, divided into 6 groups of independent temperature control, with an operating range of 400–600℃, and each group of heating tubes is equipped with an overheat protection temperature control switch; The hot section steam condenser 15 uses a φ32mm 316L stainless steel coil with a total length of 120m and a total heat exchange area of ​​12.06㎡, and is completely immersed in the hot water storage tank; the cold water collection tank 18 of the heat storage section has a volume of 0.8m³, is a closed pressurized design, and collects condensate to supply the circulating water for the steam generator; the temperature sensor 9 of the heat storage section has a range of 0–700℃ and an accuracy of ±1℃; the pressure sensor 10 of the heat storage section has a range of 0–0.5MPa and an accuracy of ±0.002MPa.

[0035] (iv) Key parameters of CaO feeding and circulation section (section D) The CaO feeding channel 30 has a cross-sectional size of 300mm×300mm and is equipped with a tubular chain conveyor mechanism 31. The hopper volume is 0.6L, the chain conveying speed is 0.15m / s, and the lifting rate is 0.75t / h. The CaO feeding section control valve 8 is a pneumatic gate valve, which completely isolates the heat release section and the heat storage section cavity.

[0036] (v) Steam generating unit and hot water storage tank The steam generator 20 has a rated evaporation capacity of 120 kg / h and a saturated steam temperature of 100℃; the steam generator inlet valve 19 and hot water outlet valve 1 are both DN40 pneumatic control valves; the hot water storage tank 21 has an effective volume of 12 m³, a design pressure of 0.12 MPa, and a matching hot water storage tank safety valve 24 with a set pressure of 0.15 MPa; the inlet pipe 17 is connected to a 0.3 MPa municipal pressurized water source; the hot water storage tank temperature sensor 27 has a range of 0–100℃ and an accuracy of ±0.3℃.

[0037] (vi) Hardware configuration of controller 6 The controller adopts a PLC programmable logic controller, equipped with a 16-channel analog signal acquisition module and a 24-channel digital signal output module; preset judgment thresholds: 15 minutes for temperature and pressure stability judgment during the heat storage process, and 12 minutes for temperature and pressure stability judgment during the heat release process; target temperature for heat storage heating is 520℃; set temperature for external hot water supply is 75℃; the controller has local touch screen display and remote 485 communication for uploading operating data. Example 2

[0038] This embodiment provides a chemical thermal storage method for the modular Ca(OH)2 / CaO chemical thermal storage device integrating thermal storage and release, as described in Embodiment 1. The method includes a water filling preparation process, a thermal storage dehydration reaction process, and a thermal release synthesis reaction process. The medium circulates in a closed loop within the device throughout the entire process, requiring no external transfer. Pre-filling: Automatically fills the hot water storage tank with heat exchange water, providing a heat exchange medium for heat buffering during the heat release stage and water vapor condensation during the heat storage stage; Thermal storage process: Ca(OH)2 particles are fed into the thermal storage chamber and heated at 400–600℃ to dehydrate and generate CaO. Water vapor is condensed and recovered through the built-in coil. The reaction is judged to be complete after the temperature and pressure are continuously stable for 10–30 minutes, and heating is automatically stopped. The heat release process: CaO particles are lifted into the heat release chamber, and water vapor is evenly introduced to generate hydration heat release. The heat heats the water in the hot water storage tank that is submerged in the chamber; once the water temperature reaches the standard or the temperature and pressure stabilize, the steam supply and material conveying are automatically stopped. Medium circulation: The Ca(OH)2 generated by heat release automatically falls back to the material drop section, which can directly start the next round of heat storage process, realizing in-situ regeneration of the medium and unlimited closed-loop circulation.

[0039] Method Application Examples

[0040] Operational preparation: The heat output of the heat storage / heat release device of this invention is ultimately hot water below 100°C. After the chemical heat storage material CaO reacts with water to release heat, the heat is exchanged with the water in the storage tank 21, and the heat is temporarily stored in the storage tank 21 in the form of sensible heat. Therefore, before the device starts the heat release reaction, the storage tank 21 should be filled with water. Specifically, the water inlet pipe 17 is connected to a pressurized water source, the controller 6 sends a signal to open the hot water outlet valve 1 to start filling water, and after the water fills the storage tank 21, the hot water outlet valve 1 is closed. Thermal storage reaction: The product after the exothermic hydration reaction is Ca(OH)2. Controller 6 sends a signal to open the Ca(OH)2 discharge section control valve 16, opening discharge section B. Granular Ca(OH)2 continuously falls from discharge section B under gravity to thermal storage section C. The thermal storage section feed motor 11 drives the thermal storage section auger feed device 13 to rotate at a constant speed, pushing the Ca(OH)2 particles forward at a constant speed along the inner shell 12 of the thermal storage section cavity until it fills the entire cavity. Then, the thermal storage section auger feed device 13 stops operating, and controller 6 starts the thermal storage section heating tube 14 to heat the Ca(OH)2 in the thermal storage section C cavity to a reaction temperature of 400-600℃ and maintain it. Ca(OH)2 begins the dehydration reaction, absorbing heat (Ca(OH)2... The reaction CaO + H2O - ΔH produces water vapor, which is condensed into liquid water in the hot water storage tank 21 through the steam condenser pipe 15 of the heat storage section and flows into the cold water collection pool 18 of the heat storage section. When the temperature and pressure detected by the temperature sensor 9 and the pressure sensor 10 of the heat storage section tend to stabilize, the heat storage reaction is determined to be over. The controller 6 sends a signal to stop the power supply to the heating pipe 14 of the heat storage section and closes the control valve 16 of the Ca(OH)2 feeding section, and the heat storage process ends. Exothermic reaction: Controller 6 drives the CaO lifting section control valve 8 to open, the CaO lifting channel 30 is opened, the tubular chain or bucket lifting mechanism is started, and the exothermic section feeding motor 7 starts, driving the exothermic section feeding auger 23 to rotate, pushing the CaO conveyed by the lifting mechanism along the exothermic section cavity at a uniform speed; simultaneously, the steam generator inlet valve 19 is opened, the steam generator 20 is started, and steam is generated and introduced into the hollow shaft of the exothermic section feeding auger 23 through the pipeline, and is uniformly released from the steam delivery hole 26 in the exothermic section; when the steam mixes with the uniformly pushed CaO material, the exothermic reaction (CaO + H2O) begins. (Ca(OH)2+ΔH), because the exothermic section cavity is immersed in the hot water in the water storage tank 21, the water in the water storage tank 21 is continuously heated, and the heat is stored in the form of sensible heat; when the water temperature rises to the set temperature, the steam supply of the steam generator can be interrupted, and the exothermic reaction stops; or the temperature and pressure detected by the exothermic section temperature sensor 4 and the exothermic section pressure sensor 5 are stable, it can be judged that the CaO reaction is complete, the controller 6 sends a signal to stop the CaO delivery and steam supply, close the material lifting section control valve 8, and the exothermic reaction ends.

[0041] Based on the 200kWh integrated thermal storage device described in the application example, a complete thermal storage-heat release cycle process is executed. The medium is industrial-grade CaO / Ca(OH)2 particles with a particle size of 0.5–3mm. The total mass of the medium loaded in a single batch is 3.2t. The complete steps are as follows: S1. Equipment Water Filling Preparation Procedure The operator connects a 0.3MPa municipal pressurized water source to the inlet pipe 17. The controller 6 is powered on and initialized, and automatically outputs an open signal to the hot water outlet valve 1. The water source continuously fills the 12m³ hot water storage tank 21. The temperature sensor 27 of the hot water storage tank synchronously monitors the water level and temperature. When the tank is completely filled with water, the controller detects that the water temperature is stable and has not risen, and the water level has reached the upper limit. It then automatically closes the hot water outlet valve 1. The water filling process takes about 18 minutes, completing the preparatory work.

[0042] S2, Thermal storage dehydration reaction process (executed during off-peak electricity hours, energy storage during periods of low electricity prices). S201, the controller opens the control valve 16 of the Ca(OH)2 discharge section. The Ca(OH)2 particles generated in the previous heat release fall into the heat storage section cavity by gravity along the Ca(OH)2 discharge pipe 28. The controller starts the heat storage section feeding motor 11, which drives the heat storage section auger feeding device 13 to push the Ca(OH)2 particles evenly to the inside of the heat storage section cavity at a low speed of 0.8t / h. After running for about 40 minutes, the cavity is completely filled with the medium, and the controller stops the auger operation.

[0043] S202, the controller connects all 6 sets of power to the heating tubes 14 in the heat storage section. The heating tubes heat up to the set target temperature of 520℃ and maintain the temperature. Inside the cavity, Ca(OH)2 undergoes a reversible dehydration reaction: \(\ce{Ca(OH)2=CaO+H2O-ΔH}\). The reaction continuously generates water vapor, which is introduced into the steam condenser tube 15 in the heat storage section and indirectly exchanges heat with the room temperature water in the hot water storage tank. The water vapor condenses into liquid water and flows into the cold water collection tank 18 in the heat storage section by gravity for storage. The condensate can be recycled to supply water to the steam generator.

[0044] S203, the temperature sensor 9 of the heat storage section, and the pressure sensor 10 of the heat storage section continuously collect a set of temperature and pressure data every second and upload it to the controller. The controller compares the data with the internal preset stable threshold in real time. If the temperature fluctuation of the cavity is ≤±3℃ and the pressure fluctuation is ≤±0.003MPa for 15 consecutive minutes, it is determined that the Ca(OH)2 dehydration reaction is complete. The controller synchronously outputs a command to cut off the power supply to all heating tubes in the heat storage section and closes the control valve 16 of the Ca(OH)2 discharge section, thus ending the heat storage process. The total time for a single heat storage process is about 3.2 hours. The medium is completely converted into CaO, and the heat storage is completed.

[0045] S3, Hot water recombination reaction process (executed during peak electricity consumption periods and when heating is required). S301, the controller opens the CaO feeding section control valve 8 and starts the tubular chain transmission mechanism 31 to lift the CaO particles generated in the heat storage process to the feed port of the heat release section unit at a rate of 0.75t / h; the heat release section feed motor 7 is started simultaneously, and the hollow heat release section feed auger 23 pushes the CaO particles at a uniform speed to move slowly along the inside of the heat release section cavity, and the material forms a uniform material layer in the cavity.

[0046] S302, the controller opens the steam generator inlet valve 19, and the municipal water source supplies water to the steam generator 20. The generator produces 100℃ saturated steam. The steam is introduced into the hollow shaft of the feed auger 23 in the hollow exothermic section, and is evenly sprayed into the cavity through the 3mm steam delivery holes 26 distributed along the axial direction. The steam comes into full contact with the moving CaO particles and undergoes a hydration exothermic reaction: CaO + H2O. Ca(OH)2+ΔH; The outer shell of the heat release section is completely submerged in the water in the hot water storage tank, and the chemical heat released by the reaction is continuously transferred to the water in the tank, causing the water temperature to gradually increase.

[0047] S303, the temperature sensor 4 of the heat release section, and the pressure sensor 5 of the heat release section collect the internal temperature and pressure data of the cavity every second. The temperature sensor 27 of the hot water storage tank monitors the hot water temperature in real time. When the water temperature of the hot water storage tank rises to the set external supply temperature of 75℃, or the temperature and pressure values ​​of the heat release section remain stable without significant fluctuations for 12 minutes, it is determined that the CaO hydration reaction is complete. The controller outputs shutdown commands in sequence: stop the steam generator 20, shut down the feed motor 7 of the heat release section, stop the pipe chain conveyor 31, and close the control valve 8 of the CaO lifting section. The heat release process ends. The total time for a single heat release process is about 2.8 hours. The 75℃ hot water in the tank can be continuously supplied to the plant area for heating and process hot water through the hot water pipe 2 and the hot water outlet valve 1. After the heat release is completed, Ca(OH)2 particles are generated inside the cavity and automatically fall back to the Ca(OH)2 dropping section B without manual transfer.

[0048] S4, Cyclic Switching After the heat release process is completed, the equipment remains in standby mode. When the power grid enters the off-peak electricity period at night, the controller can automatically repeat the S2 heat storage reaction process. The Ca(OH)2 medium is dehydrated and regenerated in situ, realizing a continuous multi-round closed-loop cycle of heat storage and heat release without human intervention. No external replenishment or replacement of the heat storage medium is required throughout the process.

[0049] Example 3: Multi-module parallel expansion implementation For a large industrial park with a daily average heat load of 3000kWh, 15 standardized modular units with a capacity of 200kWh were selected and arranged in parallel. All hot water output pipelines of the modules are uniformly connected to the main heating header, and the water and power supply systems are shared. The controller is networked and can uniformly schedule the start and stop of heat storage and heat release of each module. The number of modules put into operation can be automatically adjusted according to the real-time heat load to achieve stable heating under variable load.

[0050] Device compatibility scenario description: The device in this embodiment can be directly applied to the following scenarios: 1. Industrial parks store off-peak electricity for heat at night and use it for industrial process hot water and factory heating during the day; 2. Temporary heating is not provided in mines and field exploration camps due to the lack of municipal heating networks; 3. Temporary heating at infrastructure construction sites during winter; 4. Photovoltaic and wind power are equipped with peak-shaving thermal storage to smooth out intermittent energy output fluctuations; 5. Low-temperature industrial waste heat recovery and storage in factories, and staggered utilization of waste heat.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular Ca(OH)2 / CaO chemical thermal storage device integrating heat storage and heat release, characterized in that, include: The machine casing (29), insulation layer, hot water storage tank, CaO heat release section unit (A), Ca(OH)2 feeding section unit (B), heat storage section unit (C), CaO feeding circulation section (D), steam generation unit, sensing and detection components, actuator valve group and controller (6); among which: The CaO exothermic section (A), Ca(OH)2 feeding section (B), heat storage section (C), and CaO feeding and circulation section (D) are connected end to end to form a closed material circulation channel; The CaO exothermic section unit (A) consists of a cylindrical exothermic section cavity shell (22), a concentrically arranged hollow exothermic section feed auger (23), and an exothermic section feed motor (7); the hollow shaft of the hollow exothermic section feed auger (23) has steam delivery holes (26) evenly opened along the axial direction on its side wall; one end of the exothermic section feed auger (23) extends out of the exothermic section cavity shell (22) to connect to the exothermic section feed motor (7), and the other end is connected to the steam generator (20) via a pipeline; the exothermic section cavity shell (22) is completely submerged inside the water body of the hot water storage tank (21); an exothermic section exhaust pipe (3) connected to the atmosphere is opened at the end of the cavity. The Ca(OH)2 discharge section unit (B) connects the bottom of the heat release section and the inlet of the heat storage section. It consists of a Ca(OH)2 discharge pipe (28) and a Ca(OH)2 discharge section control valve (16) installed in the middle. The Ca(OH)2 discharge section control valve (16) is used to cut off the material falling channel and control the start and stop of the heat storage process. After the heat release is completed, the Ca(OH)2 generated falls into the heat storage section cavity by gravity. The thermal storage section unit (C) consists of a cylindrical thermal storage section cavity shell (12), a thermal storage section auger feeding device (13), a thermal storage section feeding motor (11), a spiral-wound thermal storage section electric heating tube (14), and a thermal storage section steam condenser tube (15). The thermal storage section auger feeding device (13), the thermal storage section electric heating tube (14), and the thermal storage section cavity shell (12) are arranged concentrically. The thermal storage section auger feeding device (13) pushes Ca(OH) 2. The particles are evenly spread throughout the cavity; the electric heating tube (14) of the heat storage section provides the reaction temperature and triggers the dehydration and decomposition of Ca(OH)2; the water vapor generated by the reaction is introduced into the spiral steam condenser tube (15) of the heat storage section, and the steam condenser tube (15) of the heat storage section is completely immersed in the interior of the hot water storage tank (21). The water vapor and the water in the hot water storage tank (21) exchange heat indirectly and condense into liquid water. The liquid water flows into the cold water collection pool (18) of the heat storage section for recycling and reuse. The CaO feeding circulation section (D) is located between the CaO exothermic section (A) and the heat storage section (C), and includes a CaO feeding channel (30), a CaO feeding section control valve (8), and a tubular chain wear-resistant hopper conveying mechanism (31). The CaO particles generated in the heat storage process are lifted to the inlet of the exothermic section through the tubular chain wear-resistant hopper conveying mechanism (31) to complete the medium circulation. The CaO feeding section control valve (8) is used to cut off the feeding channel and isolate the two reaction chambers. The actuator valve and sensor detection components are connected to the controller (6) via signal lines. The feed motor (7) of the heat release section and the feed motor (11) of the heat storage section are linked to the controller (6) via power supply lines.

2. The modular Ca(OH)2 / CaO chemical thermal storage device integrating heat storage and release according to claim 1, characterized in that, The steam generating unit includes a steam generator (20), a steam generator inlet valve (19), and an external inlet pipe (17). The inlet pipe (17) is divided into two water supply lines: one supplying water to the steam generator to prepare the steam required for the hydration reaction, and the other supplying water directly to the hot water storage tank (21). The hot water storage tank (21) is equipped with a hot water storage tank safety valve (24), a hot water output pipeline (2), and a hot water outlet valve (1) on its upper part.

3. The modular Ca(OH)₂ / CaO chemical thermal storage device integrating heat storage and release according to claim 2, characterized in that, The interior of the outer shell (29) is filled with aluminum silicate composite insulation cotton to form an insulation layer with a thickness of 80–150 mm. The insulation layer covers the inner side of the heat release section cavity shell (22), the heat storage section cavity shell (12) and the outer shell (29) respectively, reducing the heat loss of the equipment to the outside.

4. The modular Ca(OH)₂ / CaO chemical thermal storage device integrating heat storage and release according to claim 3, characterized in that, The interior of the outer shell (29) is filled with aluminum silicate composite insulation cotton to form an insulation layer with a thickness of 80–150 mm. The insulation layer covers the inner side of the heat release section cavity shell (22), the heat storage section cavity shell (12) and the outer shell (29) respectively, reducing the heat loss of the equipment to the outside.

5. A modular Ca(OH)₂ / CaO chemical thermal storage device integrating thermal storage and heat release according to claim 4, characterized in that, The electric heating tube (14) of the heat storage section is an electric heating sleeve structure. The electric heating sleeve structure is arranged spirally around the outer periphery of the auger feeding device (13) of the heat storage section. The rated working temperature range of the heating tube is 400–600℃. It is equipped with a temperature control protection module and a controller.

6. A modular Ca(OH)₂ / CaO chemical thermal storage device integrating thermal storage and heat release according to claim 5, characterized in that, The steam condenser tube (15) of the heat storage section is a 316L stainless steel spiral coil. The total heat exchange area of ​​the 316L stainless steel spiral coil is not less than the heat exchange requirement corresponding to the volume of the heat storage section cavity. The 316L stainless steel spiral coil is completely immersed in the water body inside the hot water storage tank (21), and the water vapor exchanges heat and condenses indirectly with the water body of the hot water storage tank.

7. A modular Ca(OH)₂ / CaO chemical thermal storage device integrating thermal storage and heat release according to claim 6, characterized in that, The controller (6) has a built-in data acquisition module, logic judgment module and output drive module; the data acquisition module collects the detection values ​​of each temperature and pressure sensor in real time; the logic judgment module is configured with a reaction endpoint judgment threshold, and outputs a shutdown command when the temperature and pressure data of the heat storage section continuously and stably reach the set time or the temperature and pressure of the heat release section and the water temperature of the hot water tank (21) reach the set threshold; the output drive module controls the opening and closing of each valve, the start and stop of the motor, the power supply of the heating pipe of the heat storage section, and the start and stop of the steam generator.

8. A modular Ca(OH)2 / CaO chemical thermal storage device integrating thermal storage and heat release according to claim 7, characterized in that, The sensing and detection assembly fully covers the two reaction chambers and the hot water storage tank (21), and consists of a temperature sensor (4) for the heat release section, a pressure sensor (5) for the heat release section, a temperature sensor (9) for the heat storage section, a pressure sensor (10) for the heat storage section, and a temperature sensor (27) for the hot water storage tank, and is used to collect temperature and pressure data of the reaction process in real time.

9. A modular Ca(OH)₂ / CaO chemical thermal storage device integrating thermal storage and heat release according to claim 8, characterized in that, The cold water collection tank (18) of the heat storage section is a closed pressurized water tank that collects the liquid water generated by condensation. The collection tank is reserved with a sewage outlet and a water supply interface, so that it can circulate and supply water to the steam generator.

10. A chemical thermal storage method for a modular Ca(OH)2 / CaO chemical thermal storage device integrating thermal storage and heat release as described in any one of claims 1-9, comprising: S1, Equipment water filling preparation process, including: the controller (6) opens the hot water outlet valve (1), pressurized water source is injected into the hot water storage tank (21) through the water inlet pipe (17), the temperature sensor (27) of the hot water storage tank monitors the water level and water temperature in real time, and when the hot water storage tank (21) is full of water, the controller (6) automatically closes the hot water outlet valve (1) to complete the pre-preparation for heat storage and heat release; S2, thermal storage reaction process, including: S201, the controller (6) opens the control valve (16) of the Ca(OH)2 discharge section, and the Ca(OH)2 particles generated by the hydration reaction fall into the heat storage section cavity through the Ca(OH)2 discharge pipe (28) by gravity; the controller (6) starts the heat storage section feeding motor (11), and drives the heat storage section auger feeding device (13) to push the Ca(OH)2 particles at a uniform speed to fill the inside of the heat storage section cavity. After the material is filled, the auger stops running. S202, the controller (6) connects the power supply to the heating tube (14) of the heat storage section, the heating tube (14) of the heat storage section heats the Ca(OH)2 inside the cavity to 400–600℃, triggering the reversible dehydration reaction Ca(OH)2→CaO+H2O, and the reaction generates water vapor; the water vapor is introduced into the steam condenser (15) of the heat storage section, and exchanges heat with the water in the hot water storage tank (21) to condense into liquid water, and the condensate flows into the cold water collection pool (18) of the heat storage section. S203, the temperature sensor (9) and pressure sensor (10) of the heat storage section continuously collect temperature and pressure data inside the cavity, and the controller (6) compares the data with the preset stable threshold in real time; when the temperature and pressure data values ​​are continuously and stably maintained for 10-30 minutes without significant fluctuations, it is determined that the heat storage dehydration reaction is complete; the controller (6) cuts off the power supply to the heating tube (14) of the heat storage section and closes the control valve (16) of the Ca(OH)2 discharge section, and the heat storage process ends; S3, exothermic reaction process: S301, the controller (6) opens the CaO lifting section control valve (8), starts the tubular chain wear-resistant hopper transmission mechanism (31), and lifts the CaO particles generated in the heat storage process to the inlet of the heat release section unit; simultaneously starts the heat release section feeding motor (7), and the hollow heat release section feeding auger (23) pushes the CaO particles along the inside of the heat release section cavity at a uniform speed; S302, the controller (6) opens the water inlet valve (19) of the steam generator, and the water inlet supplies water to the steam generator (20) and generates saturated steam. The steam is introduced into the interior of the hollow heat release section feed auger (23) and is evenly released into the cavity through the steam conveying hole (26) of the heat release section. The steam comes into contact with CaO particles and undergoes a hydration exothermic reaction CaO+H2O→Ca(OH)2. The heat released by the reaction is transferred to the water in the hot water storage tank (21) that is submerged in the heat release section cavity, and the water is heated to form hot water that can be supplied externally. S303, the temperature sensor (4) and pressure sensor (5) of the heat release section collect the temperature and pressure inside the heat release chamber in real time, and the temperature sensor (27) of the hot water storage tank monitors the hot water temperature; when the water temperature of the hot water storage tank (21) reaches the set heating temperature, or the temperature and pressure values ​​of the heat release section are continuously stable for 10–30 min, it is determined that the CaO hydration reaction is complete; the controller (6) stops the steam generator (20), the feed motor (7) of the heat release section, and the pipe chain wear-resistant hopper transmission mechanism (31) in sequence, and closes the control valve (8) of the CaO lifting section, and the heat release process ends; S4, cyclic switching, includes: after the exothermic process is completed, the Ca(OH)2 material generated automatically falls into the Ca(OH)2 feeding section, and the S2 heat storage reaction process is repeated to realize the in-situ regeneration and circulation of the reactants. No external replenishment and / or replacement of the heat storage medium is required throughout the process.

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