Double-medium thermochemical energy storage system and method

Abstract

The invention discloses a double-medium thermochemical energy storage system and method. The double-medium thermochemical energy storage system comprises a first regulating valve, a gas storage tank, a thermochemical reactor, a fan, a steam pocket, a water feeding pump and a circulating water pump, the first regulating valve is communicated with an inlet of the gas storage tank through the fan and the electric heater, an outlet of the gas storage tank is communicated with an inlet of a heat exchange tube in the thermochemical reactor, an outlet of the heat exchange tube in the thermochemical reactor is divided into two paths, one path is communicated with an inlet of the fan, and the other path is communicated with a shell side inlet of the steam pocket; a bottom outlet on the shell side of the steam drum is communicated with an inlet of the circulating water pump after being combined with an outlet of the water feeding pump through a pipeline, an outlet of the circulating water pump is communicated with an inlet of a heat exchange pipe in the thermal chemical reactor, a shell side outlet of the thermal chemical reactor is communicated with the pipe side of the steam drum, and a pipe side inlet of the thermal chemical reactor is communicated with a drainage pipe. According to the system and the method, the heat exchange efficiency of the thermochemical reactor can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermochemical energy storage, and relates to a dual-medium thermochemical energy storage system and method. Background Art

[0002] During the actual operation of a thermochemical reactor, we often face a rather intractable problem, that is, the poor thermal conductivity of the materials inside the thermochemical reactor. This characteristic of the materials themselves greatly limits the heat exchange efficiency during the heat storage and heat release processes of the thermochemical reactor.

[0003] In the design of traditional thermochemical reactors, the heat storage process usually relies on electric heating rods to achieve. As a common heating method, the working principle of electric heating rods is to convert electrical energy into heat energy, thereby heating and raising the temperature of the materials in the reactor to complete the heat storage operation. However, the function of electric heating rods is relatively single, and it can only play the role of heating and heat storage, and cannot play a role during the heat release process.

[0004] Correspondingly, during the heat release process, traditional thermochemical reactors generally use heat exchange tubes to transfer the heat released by the materials. Due to its specific structure and material, the heat exchange tube can achieve heat exchange to a certain extent, conduct the heat generated by the materials in the reactor to the outside to meet the heat utilization or emission requirements of subsequent processes. However, similarly, the heat exchange tube also has limitations in function. It mainly focuses on heat transfer during heat release and cannot participate in the work during the heat storage stage.

[0005] This design method of relying on electric heating rods for heat storage, heat exchange tubes for heat release, and the two cannot be used interchangeably brings a significant drawback, that is, the heat exchange areas during both the heat storage and heat release processes are very limited. During heat storage, since heat transfer only relies on the limited area around the electric heating rods, the diffusion and storage speed of heat in the materials are slow, making it difficult to complete the heat storage task quickly and efficiently; while during heat release, the heat exchange area of the heat exchange tube is limited, resulting in the heat released by the materials not being transferred out in a timely and sufficient manner, easily causing heat accumulation in the reactor, which not only affects the heat release efficiency but may also have an adverse impact on the safe operation of the reactor, thus leading to a low heat exchange efficiency of the thermochemical reactor. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a dual-medium thermochemical energy storage system and method, which can improve the heat exchange efficiency of the thermochemical reactor.

[0007] To achieve the above purpose, the present invention discloses a dual-medium thermochemical energy storage system, including a first regulating valve, a gas storage tank, a thermochemical reactor, a blower, a steam drum, a feed water pump, and a circulating water pump;

[0008] The first regulating valve is connected to the inlet of the gas storage tank through a fan and an electric heater. The outlet of the gas storage tank is connected to the inlet of the heat exchange tubes in the thermal chemical reactor. The outlet of the heat exchange tubes in the thermal chemical reactor is divided into two paths. One path is connected to the inlet of the fan, and the other path is connected to the inlet of the shell side of the steam drum. The bottom outlet of the shell side of the steam drum and the outlet of the feed water pump are connected to the inlet of the circulating water pump through a pipe and a combined pipe. The outlet of the circulating water pump is connected to the inlet of the heat exchange tubes in the thermal chemical reactor. The shell side outlet of the thermal chemical reactor is connected to the tube side of the steam drum. The inlet of the tube side of the thermal chemical reactor is connected with a drain pipe, and a drain valve is provided on the drain pipe.

[0009] The further improvement of the dual-medium thermal chemical energy storage system of the present invention lies in:

[0010] Further, the outlet of the gas storage tank is connected to the inlet of the heat exchange tubes in the thermal chemical reactor through a second regulating valve.

[0011] Further, the outlet of the heat exchange tubes in the thermal chemical reactor is divided into two paths. One path is connected to the inlet of the fan through a first switching valve, and the other path is connected to the inlet of the shell side of the steam drum through a fourth switching valve.

[0012] Further, the shell side outlet of the thermal chemical reactor is connected to the tube side of the steam drum through a second switching valve and a third switching valve.

[0013] Further, the shell side outlet of the steam drum is connected to a fourth regulating valve.

[0014] Further, the shell side outlet of the steam drum is connected to the pipe between the second switching valve and the third switching valve through a third regulating valve.

[0015] Further, the thermal chemical reactor is a shell-and-tube type thermal chemical reactor.

[0016] The present invention discloses a dual-medium thermal chemical energy storage method, which includes the following steps:

[0017] Heat storage process: Open the first regulating valve, start the fan and the electric heater. The high-temperature gas first enters the gas storage tank for pressure boosting. When the pressure is greater than the set value P1, then open the second regulating valve and the first switching valve, close the fourth switching valve and the drain valve. The high-temperature gas enters the heat exchange tubes in the thermal chemical reactor to release heat, and the low-temperature gas after heat release returns to the inlet of the fan for circulation; Open the second switching valve and the third switching valve. The decomposed steam in the thermal chemical reactor enters the tube side of the steam drum and is discharged after condensation. During the heat storage process, the second regulating valve is used to control the pressure of the gas storage tank and the air intake into the heat exchange tubes in the thermal chemical reactor;

[0018] Heat release process: Close the second regulating valve, drain valve, first switching valve and third switching valve, open the fourth switching valve, start the circulating water pump, the circulating water enters the heat exchange tubes in the thermochemical reactor, and the generated steam enters the steam drum. When the pressure P1 in the steam drum is greater than the set value, open the fourth regulating valve. When the material temperature T1 in the thermochemical reactor is less than the set value Tb, open the third regulating valve. Part of the steam in the steam drum enters the thermochemical reactor to react with the material and release heat. When the material temperature in the thermochemical reactor is lower than the set value Tc, or the steam generated by the thermochemical reactor cannot meet the user's demand, the heat release stops;

[0019] A further improvement of the dual-medium thermochemical energy storage method described in the present invention lies in:

[0020] Furthermore, during the heat storage process, set the material temperature in the thermochemical reactor as T1. When T1 is greater than the set value Ta, it is considered that the heat storage is completed. At this time, the system heat storage Q = a1m1ΔT1 + m1h + a2m2ΔT2, where a1 is the specific heat of the material in the thermochemical reactor, m1 is the mass of the material in the thermochemical reactor, h is the chemical heat of the material, a2 is the specific heat of the hot water in the steam drum, m2 is the mass of the hot water in the steam drum, and T2 is the temperature of the hot water in the steam drum.

[0021] Furthermore, during the heat release process, the opening degree of the third regulating valve is inversely proportional to the material temperature rising rate, a3 / k1 = dT1 / dt, where a3 is the proportionality coefficient and k1 is the opening degree of the third regulating valve.

[0022] The present invention has the following beneficial effects:

[0023] When the dual-medium thermochemical energy storage system and method described in the present invention are specifically operated, during the heat storage process, start the fan and the electric heater. The high-temperature gas first enters the gas storage tank for pressure boosting, and then enters the heat exchange tubes in the thermochemical reactor to release heat. The low-temperature gas after heat release returns to the inlet of the fan for circulation; during the heat release process, start the circulating water pump, the circulating water enters the heat exchange tubes in the thermochemical reactor, and the generated steam enters the steam drum. That is, the high-temperature gas passes through the heat exchange tubes during the heat storage process, and water passes through during the heat release process, which greatly increases the heat exchange area of the overall reactor and further improves the heat exchange power, with extremely strong practicability. Description of the Drawings

[0024] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 It is the process flow chart of the method of the present invention.

[0026] Among them, 1 is the first regulating valve, 2 is the fan, 3 is the electric heater, 4 is the gas storage tank, 5 is the second regulating valve, 6 is the thermal chemical reactor, 6.1 is the heat exchange tube, 7 is the first switching valve, 8 is the second switching valve, 9 is the third switching valve, 10 is the steam drum, 11 is the third regulating valve, 12 is the circulating water pump, 13 is the fourth switching valve, 14 is the fourth regulating valve, 15 is the feed water pump, and 16 is the drain valve. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "including" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0029] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0030] It should be further understood that the term " / " used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the preceding and following related objects.

[0031] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0032] Depending on the context, as used herein, the word "if" can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)".

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components in the descriptions and shown in the accompanying drawings of the present invention herein can be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear illustration, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can additionally design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0035] As is well known, a thermal chemical reactor is a device for implementing a specific chemical reaction process. It uses thermal energy to drive chemical reactions and is widely used in multiple fields such as chemical industry, energy, and environmental protection. The following is a detailed introduction to the thermal chemical reactor: The thermal chemical reactor provides the necessary heat and reaction environment to cause the raw materials to undergo chemical reactions under certain conditions to produce the desired products. Its principle generally involves the transfer and utilization of thermal energy to accelerate or promote the progress of chemical reactions.

[0036] The main types include kettle reactors, tubular reactors, tower reactors, fixed-bed reactors and fluidized-bed reactors. Among them, kettle reactor: Structure: It is mainly composed of a stirrer, a tank body, a jacket, a discharge pipe, a manhole, a shaft seal, a transmission device and a support, etc. Application: Widely used in organic chemical production and fine chemical production, suitable for homogeneous reactions such as esterification reaction and saponification reaction, as well as multiphase reactions such as liquid-phase, liquid-liquid phase, liquid-solid phase, gas-liquid-solid phase, etc. Characteristics: Wide applicable temperature and pressure ranges, strong adaptability, and large operating flexibility. Tubular reactor: Structure: It can be divided into single-tube and multi-tube types. Among the multi-tubes, there are two forms: multi-tube parallel connection and multi-tube series connection. Application: More used in continuous reactions, such as cracking of petroleum hydrocarbons to produce ethylene and propylene, synthesis of vinyl chloride, synthesis of ethylene oxide, etc. Characteristics: Less backmixing. When the flow rate is low, the flow pattern of the fluid in the tube is close to that of an ideal fluid.

[0037] Example 1

[0038] Reference Figure 1 , for the dual-medium thermochemical energy storage system of the present invention, it includes a first regulating valve 1, a gas storage tank 4, a thermochemical reactor 6, a fan 2, a steam drum 10, a feed water pump 15 and a circulating water pump 12; the first regulating valve 1 is connected to the inlet of the gas storage tank 4 through the fan 2 and an electric heater 3, the outlet of the gas storage tank 4 is connected to the inlet of the heat exchange tube 6.1 in the thermochemical reactor 6, the outlet of the heat exchange tube 6.1 in the thermochemical reactor 6 is divided into two paths, one path is connected to the inlet of the fan 2, and the other path is connected to the shell-side inlet of the steam drum 10. The bottom outlet of the shell side of the steam drum 10 and the outlet of the feed water pump 15 are combined through a pipeline and then connected to the inlet of the circulating water pump 12. The outlet of the circulating water pump 12 is connected to the inlet of the heat exchange tube 6.1 in the thermochemical reactor 6. The shell-side outlet of the thermochemical reactor 6 is connected to the tube side of the steam drum 10. The tube-side inlet of the thermochemical reactor 6 is connected to a drain pipe, and a drain valve 16 is provided on the drain pipe.

[0039] Example 2

[0040] Reference Figure 1 , to further improve this application, the dual-medium thermochemical energy storage system of the present invention includes a first regulating valve 1, a fan 2, an electric heater 3, a gas storage tank 4, a second regulating valve 5, a thermochemical reactor 6, a heat exchange tube 6.1, a first switching valve 7, a second switching valve 8, a third switching valve 9, a steam drum 10, a third regulating valve 11, a circulating water pump 12, a fourth switching valve 13, a fourth regulating valve 14, a feed water pump 15 and a drain valve 16;

[0041] The first regulating valve 1 is connected to the inlet of the gas storage tank 4 through the fan 2 and the electric heater 3. The outlet of the gas storage tank 4 is connected to the inlet of the heat exchange tube 6.1 in the thermal chemical reactor 6 through the second regulating valve 5. The outlet of the heat exchange tube 6.1 in the thermal chemical reactor 6 is divided into two paths. One path is connected to the inlet of the fan 2 through the first switching valve 7, and the other path is connected to the shell side inlet of the steam drum 10 through the fourth switching valve 13. The bottom outlet of the shell side of the steam drum 10 and the outlet of the feed water pump 15 are connected to the inlet of the circulating water pump 12 through a pipe and then merged. The outlet of the circulating water pump 12 is connected to the inlet of the heat exchange tube 6.1 in the thermal chemical reactor 6. The shell side outlet of the thermal chemical reactor 6 is connected to the tube side of the steam drum 10 through the second switching valve 8 and the third switching valve 9. The shell side outlet of the steam drum 10 is connected to the fourth regulating valve 14. The shell side outlet of the steam drum 10 is connected to the pipe between the second switching valve 8 and the third switching valve 9 through the third regulating valve 11. A drain pipe is connected to the tube side inlet of the thermal chemical reactor 6, and a drain valve 16 is provided on the drain pipe.

[0042] In addition, this embodiment further includes a controller. Specifically, the controller is connected to the first regulating valve 1, the fan 2, the electric heater 3, the second regulating valve 5, the first switching valve 7, the second switching valve 8, the third switching valve 9, the steam drum 10, the third regulating valve 11, the circulating water pump 12, the fourth switching valve 13, the fourth regulating valve 14, the feed water pump 15, and the drain valve 16.

[0043] Embodiment III

[0044] The present invention discloses a dual-medium thermochemical energy storage method, which is realized based on the dual-medium thermochemical energy storage system. The dual-medium thermochemical energy storage system includes a first regulating valve 1, a fan 2, an electric heater 3, a gas storage tank 4, a second regulating valve 5, a thermal chemical reactor 6, a heat exchange tube 6.1, a first switching valve 7, a second switching valve 8, a third switching valve 9, a steam drum 10, a third regulating valve 11, a circulating water pump 12, a fourth switching valve 13, a fourth regulating valve 14, a feed water pump 15, and a drain valve 16. The specific connection relationship is as shown in Embodiment II.

[0045] Specifically, the dual-medium thermochemical energy storage method includes the following steps:

[0046] Heat storage process: Open the first regulating valve 1, start the fan 2 and the electric heater 3. The high-temperature gas first enters the gas storage tank 4 to boost the pressure. When the pressure is greater than the set value P1, open the second regulating valve 5 and the first switching valve 7, close the fourth switching valve 13 and the drain valve 16. The high-temperature gas enters the heat exchange tubes 6.1 in the thermochemical reactor 6 to release heat. The low-temperature gas after heat release returns to the inlet of the fan 2 for circulation. Open the second switching valve 8 and the third switching valve 9. The steam decomposed in the thermochemical reactor 6 enters the tube side of the steam drum 10 and is discharged after condensation. During the heat storage process, use the second regulating valve 5 to control the pressure of the gas storage tank 4 and the air intake volume into the heat exchange tubes 6.1 in the thermochemical reactor 6. Set the material temperature in the thermochemical reactor 6 as T1. When T1 is greater than the set value Ta, it is considered that the heat storage is completed. At this time, the system heat storage Q = a1m1ΔT1 + m1h + a2m2ΔT2, where a1 is the specific heat of the material in the thermochemical reactor 6, m1 is the mass of the material in the thermochemical reactor 6, h is the chemical heat of the material, a2 is the specific heat of the hot water in the steam drum 10, m2 is the mass of the hot water in the steam drum 10, and T2 is the temperature of the hot water in the steam drum 10;

[0047] Heat release process: Close the second regulating valve 5, the drain valve 16, the first switching valve 7 and the third switching valve 9. Open the fourth switching valve 13 and start the circulating water pump 12. The circulating water enters the heat exchange tubes 6.1 in the thermochemical reactor 6, and the generated steam enters the steam drum 10. When the pressure P1 of the steam drum 10 is greater than the set value, open the fourth regulating valve 14. When the material temperature T1 in the thermochemical reactor 6 is less than the set value Tb, open the third regulating valve 11. Part of the steam in the steam drum 10 enters the thermochemical reactor 6 to react with the material and release heat. The opening degree of the third regulating valve 11 is inversely proportional to the material temperature rising rate, that is, a3 / k1 = dT1 / dt, where a3 is the proportionality coefficient and k1 is the opening degree of the third regulating valve 11. When the material temperature in the thermochemical reactor 6 is lower than the set value Tc, or the steam generated by the thermochemical reactor 6 cannot meet the user's demand, the heat release stops;

[0048] During the heat release process, the water level of the steam drum 10 is adjusted by the feed water pump 15. When the water level of the steam drum 10 is lower than the set value, start the feed water pump 15 to supplement the water level in the steam drum 10 to normal.

[0049] After the heat release process is completed, to avoid the hot air heat exchange of the stored water in the heat exchange tubes 6.1 in the thermochemical reactor 6 during the heat storage process, open the drain valve 16 to discharge the stored water in the heat exchange tubes 6.1.

[0050] It should be noted that the present invention designs a partition type thermochemical reactor 6. The high-temperature gas flows through the heat exchange tubes 6.1 during the heat storage process, and water flows through during the heat release process, which greatly increases the heat exchange area of the overall reactor and further improves the heat exchange power;

[0051] In addition, heat exchange tubes 6.1 are arranged inside the steam drum 10 of the present invention to recover the steam energy released during the heat storage process, thereby improving the utilization efficiency of heat. In addition, during the heat release process, the steam drum 10 serves as both a pressure stabilizing device and a reaction gas source for the thermal chemical reactor 6.

[0052] After considering the specification and the disclosure of the invention, those skilled in the art will readily conceive of other embodiments of the present invention. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0053] It should be understood that the present invention is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

[0054] The above are only the preferred embodiments of the present invention, and do not impose any limitation on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A dual-medium thermochemical energy storage system, characterized in that It includes a first regulating valve (1), a gas storage tank (4), a thermal chemical reactor (6), a fan (2), a steam drum (10), a feed water pump (15) and a circulating water pump (12); The first regulating valve (1) is connected to the inlet of the gas storage tank (4) via the fan (2) and an electric heater (3). The outlet of the gas storage tank (4) is connected to the inlet of the heat exchange tube (6.1) in the thermal chemical reactor (6). The outlet of the heat exchange tube (6.1) in the thermal chemical reactor (6) is divided into two paths. One path is connected to the inlet of the fan (2), and the other path is connected to the shell side inlet of the steam drum (10). The bottom outlet of the shell side of the steam drum (10) and the outlet of the feed water pump (15) are combined through a pipeline and then connected to the inlet of the circulating water pump (12). The outlet of the circulating water pump (12) is connected to the inlet of the heat exchange tube (6.1) in the thermal chemical reactor (6). The shell side outlet of the thermal chemical reactor (6) is connected to the tube side of the steam drum (10). The tube side inlet of the thermal chemical reactor (6) is connected to a drain pipe, and a drain valve (16) is provided on the drain pipe.

2. The dual-medium thermochemical energy storage system according to claim 1, wherein The outlet of the gas storage tank (4) is connected to the inlet of the heat exchange tube (6.1) in the thermal chemical reactor (6) via a second regulating valve (5).

3. The dual-medium thermochemical energy storage system according to claim 2, wherein The outlet of the heat exchange tube (6.1) in the thermal chemical reactor (6) is divided into two paths. One path is connected to the inlet of the fan (2) via a first switching valve (7), and the other path is connected to the shell side inlet of the steam drum (10) via a fourth switching valve (13).

4. The dual-medium thermochemical energy storage system according to claim 3, characterized in that, The shell side outlet of the thermal chemical reactor (6) is connected to the tube side of the steam drum (10) via a second switching valve (8) and a third switching valve (9).

5. The dual-medium thermochemical energy storage system according to claim 4, characterized in that, It further includes a fourth regulating valve (14), and the shell side outlet of the steam drum (10) is connected to the fourth regulating valve (14).

6. The dual-medium thermochemical energy storage system according to claim 5, wherein The shell side outlet of the steam drum (10) is connected to the pipeline between the second switching valve (8) and the third switching valve (9) via a third regulating valve (11).

7. The dual-medium thermochemical energy storage system according to claim 1, wherein The thermal chemical reactor (6) is a shell-and-tube thermal chemical reactor.

8. A dual-medium thermochemical energy storage method, characterized in that, Based on the dual-medium thermal chemical energy storage system described in claim 6, it includes the following steps: Heat storage process: Open the first regulating valve (1), start the fan (2) and the electric heater (3). The high-temperature gas first enters the gas storage tank (4) for pressure boosting. When the pressure is greater than the set value P1, then open the second regulating valve (5) and the first switching valve (7), close the fourth switching valve (13) and the drain valve (16). The high-temperature gas enters the heat exchange tube (6.1) in the thermal chemical reactor (6) to release heat, and the low-temperature gas after heat release returns to the inlet of the fan (2) for circulation. Open the second switching valve (8) and the third switching valve (9). The decomposed steam in the thermal chemical reactor (6) enters the tube side of the steam drum (10), condenses and then is discharged. During the heat storage process, use the second regulating valve (5) to control the pressure of the gas storage tank (4) and the air intake into the heat exchange tube (6.1) in the thermal chemical reactor (6); Heat release process: Close the second regulating valve (5), drain valve (16), first switching valve (7) and third switching valve (9), open the fourth switching valve (13), start the circulating water pump (12), the circulating water enters the heat exchange tubes (6.1) in the thermochemical reactor (6), and the generated steam enters the steam drum (10). When the pressure P1 of the steam drum (10) is greater than the set value, open the fourth regulating valve (14). When the material temperature T1 in the thermochemical reactor (6) is less than the set value Tb, open the third regulating valve (11). Part of the steam in the steam drum (10) enters the thermochemical reactor (6) to react with the material and release heat. When the material temperature in the thermochemical reactor (6) is lower than the set value Tc, or the steam generated by the thermochemical reactor (6) cannot meet the user's demand, the heat release stops.

9. The dual-medium thermochemical energy storage method according to claim 8, wherein, During the heat storage process, set the material temperature in the thermochemical reactor (6) as T1. When T1 is greater than the set value Ta, it is considered that the heat storage is completed. At this time, the system heat storage Q = a1m1ΔT1 + m1h + a2m2ΔT2, where a1 is the specific heat of the material in the thermochemical reactor (6), m1 is the mass of the material in the thermochemical reactor (6), h is the chemical heat of the material, a2 is the specific heat of the hot water in the steam drum (10), m2 is the mass of the hot water in the steam drum (10), and T2 is the temperature of the hot water in the steam drum (10).

10. The dual-medium thermochemical energy storage method according to claim 8, characterized in that, During the heat release process, the opening degree of the third regulating valve (11) is inversely proportional to the material temperature rising rate, a3 / k1 = dT1 / dt, where a3 is the proportionality coefficient and k1 is the opening degree of the third regulating valve (11).

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