Mobile heat supply system based on calcium-based thermochemical energy storage

Abstract

The invention discloses a movable heat supply system based on calcium-based thermochemical energy storage. The movable heat supply system comprises a centralized thermochemical energy storage unit and a movable thermochemical energy release unit. Wherein the centralized thermochemical energy storage unit drives a dehydration endothermic reaction of a calcium-based energy carrier through microwave heating, and electric energy is converted into chemical energy to be stored; and the mobile thermochemical energy release unit is used for receiving the energy carrier material with energy storage completed from the centralized thermochemical energy storage unit and transporting the energy carrier material, and driving the hydration exothermic reaction of the calcium-based energy carrier through atomization in a heat using scene, so that chemical energy is converted into heat energy for heat supply. Through the design of centralized energy storage and mobile energy release, centralized consumption of green electricity or valley electricity is achieved, energy is transported to a heat using scene in a mobile mode, green heat supply is achieved through release in a steam mode, and the problem of space-time mismatching of energy is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of thermochemical energy storage technology, and more specifically to a mobile heating system based on calcium-based thermochemical energy storage. Background Technology

[0002] Renewable energy sources, such as solar and wind power, are intermittent and unstable, resulting in a significant mismatch between peak power generation and peak energy consumption in time and space. This contradiction leads to substantial "wind and solar curtailment," wasting valuable green energy. Therefore, an efficient and low-cost technology is needed to enable large-scale and flexible utilization of green electricity and off-peak electricity, and to deliver energy to users on demand.

[0003] Thermal energy storage technology, especially thermochemical energy storage technology, is an effective way to solve the above problems due to its advantages such as high energy density, long storage period, and low heat loss. Among many thermochemical energy storage systems, the CaO / Ca(OH)2 system has become one of the most promising systems due to its wide availability of raw materials, low cost, non-toxicity, suitable reaction temperature, and high energy density (up to 104.4 kJ / mol). Using this system, electrical energy can be converted into stably stored chemical energy and released as heat when needed.

[0004] However, most existing thermochemical energy storage systems based on the CaO / Ca(OH)2 system are designed as stationary integrated devices. These systems typically couple the energy storage and release processes at the same location and within the same facility, which has the following inherent drawbacks: 1. Energy cannot be transferred spatially: The system is fixedly installed and cannot easily transport energy stored in location A (such as near a wind farm) to location B (such as a factory or residential area far from the power grid) for use. It cannot truly realize "energy transport" and limits its application in distributed heating scenarios.

[0005] 2. Dependence on Steam Source: The energy release process requires a continuous external steam source to drive the hydration reaction of CaO. For energy-consuming locations lacking a stable steam supply, the system needs to be equipped with additional steam-generating equipment, increasing the system's complexity and dependence on external conditions.

[0006] 3. Inflexible system deployment: Fixed large-scale equipment requires high investment and occupies a large area, and is not easy to deploy or relocate quickly according to changes in energy demand, resulting in poor flexibility.

[0007] Therefore, there is a need for a new type of thermochemical energy storage heating system that can spatially decouple the energy storage and release processes, has good mobility, and does not rely on external steam sources at the energy consumption site. Summary of the Invention

[0008] In order to overcome the defects existing in the prior art, the application provides a mobile heat supply system based on calcium-based thermochemical energy storage, which realizes centralized consumption of green electricity or valley electricity through centralized energy storage and mobile energy release, and transports energy to heat supply scenes in a mobile manner to release in the form of steam to realize green heat supply, thereby effectively solving the problem of time and space mismatch of energy.

[0009] In order to achieve the above-mentioned purpose, the technical scheme adopted by the application is: A mobile heat supply system based on calcium-based thermochemical energy storage, comprising a centralized thermochemical energy storage unit and a mobile thermochemical energy release unit. The centralized thermochemical energy storage unit utilizes microwave heating to drive the dehydration reaction of calcium-based energy carriers, converts electrical energy into chemical energy for storage. The mobile thermochemical energy release unit performs hydration reaction with atomized water and calcium-based energy carriers to release stored chemical energy in the form of heat energy and high-grade steam. The mobile thermochemical energy release unit is used to receive energy-stored carrier materials from the centralized thermochemical energy storage unit and transport them. The centralized thermochemical energy storage unit is deployed in green electricity-rich areas of wind power and photovoltaic power or power grid nodes with abundant valley electricity supply, uses its cheap electricity to drive the microwave heating reactor to convert Ca(OH)2 into CaO, and realizes large-scale centralized storage of electrical energy. The mobile thermochemical energy release unit is used to load energy-stored CaO, transport it to heat supply places far from power plants and residential areas by road, release heat energy and generate steam through hydration reaction on site, realize the decoupling of "centralized storage of electrical energy" and "dispersed supply of heat energy" in time and space, and effectively match the time and space mismatch between renewable energy power generation and heat demand.

[0010] The centralized thermochemical energy storage unit comprises calcium-based energy carrier materials based on a CaO / Ca(OH)2 system, a stock bin for storing the calcium-based energy carrier materials, and a microwave heating reactor for heating and decomposing Ca(OH)2 from the stock bin; the stock bin is located directly above the microwave heating reactor, and the two are connected through a feeding gate; the calcium-based energy carrier materials are stored in the stock bin and can fall into the microwave heating reactor through the feeding gate under the action of gravity.

[0011] The calcium-based energy carrier materials are CaO / Ca(OH)2 system particles, which are prepared into particles with high specific surface area and porous structure through freeze-drying and granulation process, have a particle size range of 1-5 mm, a porosity of not less than 60%, and can be doped with silicon carbide heat conduction enhancer and structure stabilizer to improve their heat transfer performance and cycle stability.

[0012] The center of the bin is provided with finned tube type condensing heat exchange pipe, the inlet of which is connected with the outlet of the steam exhaust pipe of the microwave heating reactor through a pipeline, and the outlet is connected with an external condensate water collection or discharge system.

[0013] The microwave heating reactor comprises a steam exhaust pipe, a microwave generator, a feeding gate and a discharging gate. The feeding gate is installed between the outlet of the bin bottom and the feeding port of the microwave heating reactor top, and the discharging gate is installed between the outlet of the microwave heating reactor bottom and the feeding port of the top of the packed bed reaction cavity of the mobile thermal chemical energy release unit, so as to realize the sealed transfer of the material.

[0014] The steam exhaust pipe is uniformly arranged along the side wall of the microwave heating reactor, and a plurality of parallel pipes penetrate the inside of the reactor, so as to ensure that the high-temperature steam generated in the reaction can be quickly and uniformly discharged, and the local pressure is prevented from being too high. A high-temperature resistant and microwave transparent ceramic or quartz material reaction container or tray is placed in the microwave heating reactor, which is used to carry the calcium-based energy carrier material and is provided with a thermocouple and a pressure sensor for monitoring the reaction state. The output product of the microwave heating reactor is high-temperature CaO particles and high-temperature water vapor, wherein the CaO is output to the mobile thermal chemical energy release unit through the discharging gate, and the water vapor is output to the condensing heat exchange pipe through the steam exhaust pipe.

[0015] The mobile thermal chemical energy release unit comprises a trailer head and an atomization heat release reactor pulled by the trailer head. The atomization heat release reactor is used to carry the energy-stored CaO energy carrier material, and a hydration reaction occurs between the atomized water and the CaO, so that heat energy is released, and steam is generated through the internal heat exchange equipment to realize the heating function. The atomization heat release reactor comprises a packed bed reaction cavity for accommodating CaO from the microwave heating reactor, an atomizer for providing atomized water into the packed bed reaction cavity, and a boiling heat exchange pipe, an air heat exchanger and a fan for taking heat from the packed bed reaction cavity. The outlet of the fan is connected with the tube side inlet of the air heat exchanger, the tube side outlet of the air heat exchanger is connected with the air inlet of the atomizer, and the outlet of the atomizer is connected with the packed bed reaction cavity, so as to form an air flow and atomized water conveying path. A running method of a mobile heating system based on calcium-based thermal chemical energy storage, comprising the following steps. For the energy storage process, open the feed gate of the microwave heating reactor and close the discharge gate, close the feed gate when the Ca(OH)2 calcium-based energy carrier material in the material bin falls and fills the microwave heating reactor, use green electricity or valley electricity generated by photovoltaic or wind power to drive the microwave generator to generate microwaves with a frequency of 2.45GHz, and efficiently heat the Ca(OH)2 calcium-based energy carrier material to above 500 DEG C, drive the Ca(OH)2 to decompose and absorb heat, produce CaO and steam, and store heat energy in the form of chemical energy, thereby realizing the energy storage process; When the reaction is completed, open the discharge gate and pour the CaO calcium-based energy carrier material into the accumulation bed reaction cavity of the atomization heat release reactor; in the above energy storage process, the high-temperature steam generated by the decomposition of Ca(OH)2 is condensed by the steam discharge pipe into the condensation heat exchange pipe, and the released heat is used to preheat the Ca(OH)2 calcium-based energy carrier material in the material bin; For the energy release process, use a fan to drive air to be heated to above 150 DEG C by the air heat exchanger and then pass through the atomizer to carry mist droplets; From the hot water scene, respectively into the atomizer and the boiling heat exchange pipe, the water entering the atomizer is atomized into mist droplets at room temperature and carried into the accumulation bed reaction cavity by the air flow, driving the CaO calcium-based energy carrier material to occur hydration exothermic reaction, producing Ca(OH)2, and releasing chemical energy in the form of heat energy, thereby realizing the energy release process; the water entering the boiling heat exchange pipe absorbs the released heat energy to generate steam, which is used to meet the heat demand; in the above energy release process, the air flowing through the accumulation bed reaction cavity without participating in the reaction is preheated by the air heat exchanger and then discharged into the environment.

[0016] The beneficial effects of the present application are: 1、The present application adopts a calcium-based thermochemical energy storage system CaO / Ca(OH)2, which has the characteristics of high reaction enthalpy, easy-to-obtain raw materials, low cost, non-toxicity, harmlessness, high storage safety, etc., and can realize high-density, safe, large-scale and low-cost energy storage.

[0017] 2、Through the separate design of the centralized energy storage unit and the mobile energy release unit, the time and space transfer of energy is realized, the green electricity and valley electricity are effectively absorbed, and according to the demand, the energy is transported to the places where heat energy is needed, such as factories and residential areas, to release energy for users to use, thereby expanding the application scenarios.

[0018] 3、In the energy storage process, the product steam is used to preheat the material in the material bin through the condensation heat exchange pipe, effectively recovering the heat energy in the steam and improving the energy efficiency of the system; in the energy release process, atomized water is used to enhance the reaction efficiency, without the need for an external steam source, thereby avoiding dependence on the external environment.

[0019] 4、The system structure is compact and mobile, and can be flexibly transported through a trailer head, and is suitable for various heat supply scenarios, such as industrial steam supply and house heating.

[0020] 5. By adjusting the rotation speed of the fan and the opening degree of the water inlet valve of the atomizer, the air and water amounts participating in the reaction can be accurately controlled, and the controlled steam of different temperatures can be output for use, and the use and scene are various. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A schematic diagram of a mobile heat supply system based on calcium-based thermochemical energy storage is provided.

[0022] Figure 2 A schematic diagram of a mobile heat supply system based on calcium-based thermochemical energy storage in an energy storage process is provided.

[0023] Figure 3 A schematic diagram of a mobile heat supply system based on calcium-based thermochemical energy storage in an energy release process is provided.

[0024] REFERENCE NUMERALS: Centralized thermochemical energy storage unit 1, mobile thermochemical energy release unit 2, calcium-based energy carrier material 3, stock bin 4, microwave heating reactor 5, condensation heat exchange pipe 6, steam discharge pipe 7, microwave generator 8, feeding gate 9, discharging gate 10, atomization heat release reactor 11, trailer head 12, atomizer 13, air heat exchanger 14, fan 15, boiling heat exchange pipe 16, stacked bed reaction cavity 17. DETAILED DESCRIPTION

[0025] The application will be further described in detail below with reference to the drawings.

[0026] A mobile heat supply system based on calcium-based thermochemical energy storage, comprising a centralized thermochemical energy storage unit 1 and a mobile thermochemical energy release unit 2; The centralized thermochemical energy storage unit 1 utilizes microwave heating to drive the dehydration reaction of calcium-based energy carriers, converts electrical energy into chemical energy for storage; The mobile thermochemical energy release unit 2 performs hydration reaction with atomized water and calcium-based energy carriers, releases the stored chemical energy in the form of heat energy and high-grade steam; The centralized thermochemical energy storage unit 1 is arranged in a green electricity-rich area or a power grid node with abundant valley electricity supply, and the mobile thermochemical energy release unit 2 can be transported to an energy demand site, so that the energy storage process and the energy release process are performed at different times and in different places; The centralized thermochemical energy storage unit 1 comprises calcium-based energy carrier material 3 based on CaO / Ca(OH)2 system, stock bin 4, microwave heating reactor 5; The stock bin 4 is internally provided with a condensation heat exchange pipe 6; The microwave heating reactor 5 includes a steam exhaust pipe 7, a microwave generator 8, a feeding gate 9, and a discharging gate 10. The bunker 4 is made of heat insulation material and internally provided with finned coil type condensing heat exchange pipes 6. The microwave heating reactor 5 is externally provided with a heat insulation layer, the microwave generator 8, the feeding gate 9 at the top, the discharging gate 10 at the bottom, and the steam exhaust pipe 7 at the sidewall. The outlet of the steam exhaust pipe 7 is connected to the inlet of the condensing heat exchange pipes 6 in the bunker 4 through a high-temperature resistant pipe. The calcium-based energy carrier material 3 is CaO / Ca(OH)2 system particles with a particle size of 1-5 mm, preferably prepared by freeze-drying and granulation process, and can be doped with <30 wt% of heat-conducting reinforcing materials to enhance the heat transfer performance and mechanical strength and prevent breakage and pulverization during loading, unloading and transportation.

[0027] The outlet of the steam exhaust pipe 7 is connected to the inlet of the condensing heat exchange pipes 6, so that the high-temperature steam generated by the dehydration reaction can be introduced into the condensing heat exchange pipes 6. The mobile thermochemical energy release unit 2 includes an atomization exothermic reactor 11 and a trailer head 12 carrying the reactor. The atomization exothermic reactor 11 includes an atomizer 13, an air heat exchanger 14, a fan 15, a boiling heat exchange pipe 16, and a packed bed reaction cavity 17. The outlet of the fan 15 is connected to the inlet of the tube side of the air heat exchanger 14 for preheating, the outlet of the tube side of the air heat exchanger 14 is connected to the air inlet of the atomizer 13, and the outlet of the atomizer 13 is connected to the packed bed reaction cavity 17, forming an air flow and atomized water transport path. The boiling heat exchange pipe 16 is embedded in the reaction cavity 17, the water inlet of which is connected to an external water source, and the steam outlet is used to output process steam.

[0028] The feeding gate 9 is connected to the bottom outlet of the bunker 4 and the top inlet of the microwave heating reactor 5, respectively, for controlling the supply of calcium-based energy carrier material 3 from the bunker 4 to the microwave heating reactor 5. The discharging gate 10 is connected to the bottom outlet of the microwave heating reactor 5 and the top inlet of the packed bed reaction cavity 17 of the mobile thermochemical energy release unit 2, respectively, for controlling the transfer of the reacted CaO energy carrier material to the mobile unit. The atomizer 13 is provided with an independent water inlet for connecting to an external water source; the boiling heat exchange pipe 16 is provided with a water inlet and a steam outlet for connecting to water and outputting steam, respectively.

[0029] A method for operating a mobile heat supply system based on calcium-based thermochemical energy storage, including an energy storage process and an energy release process. The energy storage process: the system is deployed in a green electricity-rich area near a wind farm or photovoltaic power station. For example, Figure 2As shown, the feed gate 9 of the microwave heating reactor 5 is opened, while its discharge gate 10 is closed. The Ca(OH)2-based energy carrier material 3, which is at ambient temperature and mainly composed of Ca(OH)2, in the silo 4 falls into and fills the microwave heating reactor 5 under the action of gravity. Subsequently, the feed gate 9 is closed, so that the reactor forms a closed reaction space. The microwave generator 8 in the microwave heating reactor 5 is driven to work by using green electricity such as photovoltaic electricity or wind power electricity or valley electricity of the power grid. The microwave energy can penetrate the energy carrier material and heat the whole material quickly and uniformly. In this stage, the material starts to rise in temperature from the initial ambient temperature (for example, 20°C), and the process converts electrical energy into sensible heat stored in the energy carrier material.

[0030] When the temperature of the energy carrier material rises to its dehydration reaction condition (for example, about 505°C), the Ca(OH)2begins to decompose: Ca(OH)2→ CaO + H2O (endothermic). This reaction absorbs a large amount of energy and converts electrical energy into chemical energy stored in the generated CaO, while generating high-temperature and high-pressure superheated steam.

[0031] The high-temperature superheated steam generated by the dehydration reaction is introduced into the condensation heat exchange pipe 6 in the silo 4 through the steam discharge pipe 7. The steam is condensed into water in the condensation heat exchange pipe 6, releasing a large amount of latent heat of vaporization, which is used to preheat the Ca(OH)2energy carrier material at ambient temperature in the silo 4 that has not participated in the reaction, effectively improving the overall energy efficiency of the system. When the dehydration reaction is fully completed, the discharge gate 10 of the microwave heating reactor 5 is opened. The CaO energy carrier material generated by the reaction in a high-temperature state is transferred to the accumulation bed reaction cavity 17 of the mobile thermochemical energy release unit 2, and the discharge gate 10 is closed. At this point, the energy storage process is completed, electrical energy has been efficiently converted into chemical energy and stored in the CaO material, and has been loaded into the mobile unit, ready for transportation. The mobile thermochemical energy release unit 2 has become a “battery” full of chemical energy, which can be towed by the trailer head 12 to any area with heating needs.

[0032] The energy release process: the mobile thermochemical energy release unit 2 is transported to the factory, residential area, or other heating site and is docked.

[0033] First, the mobile thermochemical energy release unit 2 loaded with CaO carriers is transported to the heating site and is deployed ready for use; for example, Figure 3As shown, the energy release program is started, the fan 15 is started, and the air is driven to flow through the air heat exchanger 14 to be preheated and then sent to the atomizer 13; at the same time, water is taken from the heat use scene, a part of the water is sent to the atomizer 13 and carried by the air flow in the atomizer 13 to form a uniform atomized water-air two-phase flow; the two-phase flow enters the packed bed reaction cavity 17 and fully contacts with CaO energy carrier particles therein to drive the hydration exothermic reaction to proceed rapidly: CaO + H2O → Ca(OH)2 (exothermic), so as to release the stored chemical energy in the form of heat energy; the reaction releases a large amount of chemical reaction heat, and the temperature of the packed bed region rapidly rises to above 400℃.

[0034] Another part of the water is introduced into the boiling heat exchange pipe 16 buried in the packed bed reaction cavity 17 to absorb the huge heat energy released by the hydration reaction, and is rapidly heated and generates saturated or superheated steam, which is output from the steam outlet and directly used to meet various heat demand; by adjusting the air volume of the fan 15 and the water inlet amount of the atomizer 13, By adjusting the rotating speed of the fan 15 and the water inlet valve opening degree of the atomizer 13, the air amount and the water amount participating in the reaction can be accurately controlled, so that the hydration reaction rate and the system heat supply power can be flexibly and accurately adjusted to meet different load demands.

[0035] When it is monitored that the temperature of the packed bed significantly decreases or the steam generation capacity weakens to a set threshold value, it is indicated that the current round of energy release process is basically completed. At this time, the energy carrier material in the atomization heat release reactor 11 has been mainly converted into Ca(OH)2, which can be returned to the centralized energy storage unit 1 with the moving unit to start a new round of energy storage cycle.

[0036] At this time, the energy storage and energy release processes are completed, and efficient energy storage and flexible supply are realized.

[0037] The application is especially suitable for centralized energy storage consumption of green electricity or valley electricity such as photovoltaic electricity and wind power, and transports energy to the heat use scene in a moving way to realize green heat supply in the form of steam.

Claims

1. A mobile heat supply system based on calcium-based thermochemical energy storage, characterized in that, The centralized thermo-chemical energy storage unit (1) and the mobile thermo-chemical energy release unit (2); The centralized thermo-chemical energy storage unit (1) uses microwave heating to drive the dehydration reaction of calcium-based energy carrier, converting electrical energy into chemical energy for storage. The mobile thermo-chemical energy release unit (2) is used to receive the energy-stored carrier material from the centralized thermo-chemical energy storage unit (1) and transport it.

2. A mobile heat supply system based on calcium-based thermochemical energy storage according to claim 1, characterized in that, The centralized thermo-chemical energy storage unit (1) is deployed in a green electricity-rich area or a power grid node with abundant valley electricity supply, using electrical energy to drive the microwave heating reactor (5) to convert Ca(OH)2 into CaO, realizing large-scale centralized storage of electrical energy. The mobile thermo-chemical energy release unit (2) is used to load the energy-stored CaO and transport it to a location far from the power heating site. The mobile thermo-chemical energy release unit (2) uses atomized water to hydrate with CaO, releasing the stored chemical energy in the form of heat energy and high-grade steam. The release of heat energy and the production of steam through hydration reaction on site realize the decoupling of "centralized storage of electrical energy" and "dispersed supply of heat energy" in time and space, effectively matching the temporal and spatial mismatch between renewable energy generation and heating demand.

3. A mobile heat supply system based on calcium-based thermochemical energy storage according to claim 1, characterized in that, The centralized thermo-chemical energy storage unit (1) includes calcium-based energy carrier material (3) based on CaO / Ca(OH)2 system, a bin (4) for storing the calcium-based energy carrier material (3), and a microwave heating reactor (5) for heating and decomposing Ca(OH)2 from the bin (4); the bin (4) is located directly above the microwave heating reactor (5), and the two are connected through a feeding gate (9); the calcium-based energy carrier material (3) is stored in the bin (4) and can fall into the microwave heating reactor (5) through the feeding gate (9) under the action of gravity.

4. A mobile heat supply system based on calcium-based thermochemical energy storage according to claim 3, characterized in that, The calcium-based energy carrier material (3) is CaO / Ca(OH)2 system particles, which are prepared into particles with high specific surface area and porous structure through freeze-drying and granulation process, with particle size range of 1-5mm and porosity not less than 60%.

5. A mobile heat supply system based on calcium-based thermochemical energy storage according to claim 3, characterized in that, The bin (4) is provided with finned tube type condensing heat exchange pipe (6) at the center position, the inlet of the condensing heat exchange pipe (6) is connected with the outlet of the steam discharge pipe (7) of the microwave heating reactor (5) through a pipeline, and the outlet of the condensing heat exchange pipe (6) is connected to an external condensate water collection or discharge system.

6. A mobile heat supply system based on calcium-based thermochemical energy storage according to claim 3, characterized in that, The microwave heating reactor (5) includes a steam discharge pipe (7), a microwave generator (8), a feeding gate (9), and a discharging gate (10); The feeding gate (9) is installed between the bottom outlet of the bin (4) and the top feeding port of the microwave heating reactor (5); the discharging gate (10) is installed between the bottom outlet of the microwave heating reactor (5) and the top feeding port of the packed bed reaction chamber (17) of the mobile thermo-chemical energy release unit (2), realizing sealed transfer of materials.

7. A mobile heat supply system based on calcium-based thermochemical energy storage according to claim 6, characterized in that, The steam discharge pipe (7) is uniformly arranged along the side wall of the microwave heating reactor (5), with multiple pipes penetrating through the inside of the reactor, ensuring that the high-temperature steam generated in the reaction can be quickly and uniformly discharged, avoiding excessive local pressure. The microwave heating reactor (5) is internally provided with a reaction container or tray made of ceramic or quartz material which is resistant to high temperature and transparent to microwaves, for carrying the calcium-based energy carrier material (3), and is provided with a thermocouple and a pressure sensor for monitoring the reaction state; the output product of the microwave heating reactor (5) is high-temperature CaO particles and high-temperature water vapor, wherein the CaO is output to the mobile thermal chemical energy release unit (2) through the discharge gate (10), and the water vapor is output to the condensing heat exchange pipe (6) through the steam discharge pipe (7).

8. A mobile heat supply system based on calcium-based thermochemical energy storage according to claim 7, characterized in that, The mobile thermal chemical energy release unit (2) includes a trailer head (12) and an atomized heat release reactor (11) towed by the trailer head (12); the atomized heat release reactor (11) is used for carrying the CaO energy carrier material which has stored energy, and carries out hydration reaction with atomized water to release heat energy, and generates steam through internal heat exchange equipment to realize the heating function; The atomized heat release reactor (11) includes a packed bed reaction cavity (17) for accommodating CaO from the microwave heating reactor (5), an atomizer (13) for providing atomized water into the packed bed reaction cavity (17), and a boiling heat exchange pipe (16), an air heat exchanger (14), and a fan (15) for taking heat from the packed bed reaction cavity (17); The outlet of the fan (15) is connected with the tube side inlet of the air heat exchanger (14), the tube side outlet of the air heat exchanger (14) is connected with the air inlet of the atomizer (13), and the outlet of the atomizer (13) is connected with the packed bed reaction cavity (17), forming an air flow and atomized water delivery path.

9. Method for operating a mobile heat supply system based on calcium-based thermochemical energy storage according to any one of claims 6 to 8, characterized in that The method comprises the following steps: For the energy storage process, the feed gate (9) of the microwave heating reactor (5) is opened and the discharge gate (10) is closed, when the Ca(OH)2 calcium-based energy carrier material (3) in the material bin (4) falls and fills the microwave heating reactor (5), the feed gate (9) is closed, the microwave generator (8) is driven by green electricity or valley electricity of photovoltaic or wind power to generate microwaves with a frequency of 2.45 GHz, the Ca(OH)2 calcium-based energy carrier material (3) is efficiently heated to above 500℃, the Ca(OH)2 is driven to decompose and absorb heat, CaO and steam are generated, and heat energy is stored in the form of chemical energy, thereby realizing the energy storage process; When the reaction is completed, the discharge gate (10) is opened, and the CaO calcium-based energy carrier material (3) is poured into the packed bed reaction cavity (17) of the atomized heat release reactor (11); in the above energy storage process, the high-temperature product steam released by the decomposition of Ca(OH)2 enters the condensing heat exchange pipe (6) through the steam discharge pipe (7) to condense, and the released heat is used to preheat the Ca(OH)2 calcium-based energy carrier material (3) in the material bin (4); For the energy release process, the fan (15) is used to drive air to be heated to above 150℃ through the air heat exchanger (14) and carry mist droplets through the atomizer (13); The water taken from the hot scene enters the atomizer (13) and the boiling heat exchange pipe (16) respectively, the water entering the atomizer (13) is atomized to form mist droplets at normal temperature and is carried into the accumulation bed reaction cavity (17) by the air flow, drives the CaO calcium-based energy carrier material (3) to occur hydration exothermic reaction, generates Ca(OH)2, and releases chemical energy in the form of heat energy, so that the energy release process is realized; the water entering the boiling heat exchange pipe (16) absorbs the released heat energy to generate steam, which is used to meet the heat demand; in the above energy release process, the air flowing through the accumulation bed reaction cavity (17) and not participating in the reaction enters the air heat exchanger (14) for air preheating and is discharged into the environment.

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