A low-grade heat upgrading chemical heat storage system and a heat storage method

Abstract

The application relates to the technical field of chemical heat storage, in particular to a low-grade heat upgrading chemical heat storage system and a heat storage method, which comprises the following: a humidifying atomizer connected with a low-grade wastewater conveying pipe and a compressed air conveying pipe; a preheater connected with the humidifying atomizer; one end of a first packed bed module connected with the preheater through a second valve; one end of a second packed bed module connected with the preheater through a seventh valve; the other end of the second packed bed module connected with the other end of the first packed bed module through a fourth valve; the first packed bed module adapted to be used as an adsorption bed layer or a desorption bed layer, and correspondingly, the second packed bed module adapted to be used as a desorption bed layer or an adsorption bed layer. The first packed bed module and the second packed bed module are alternately used as the adsorption bed layer and the desorption bed layer respectively; the efficient continuous heat chemical reaction storage / release process is realized; the low-grade waste heat upgrading maximization is realized; and the defect of discontinuous heat chemical storage is solved.

Description

Technical Field

[0001] This invention relates to the field of chemical thermal storage technology, specifically to a low-grade thermal upgrading chemical thermal storage system and method. Background Technology

[0002] A large amount of low-grade thermal energy exists in the production processes of metallurgy, chemical industry, and textile products, as well as in the energy sector. For example, steel mills generate a significant amount of high-temperature, medium-temperature, and low-temperature waste heat, especially in the high-temperature slag cooling stage of current processes, which produces a large amount of low-grade slag water waste heat below 70 degrees Celsius, which needs to be efficiently utilized. Existing thermal storage technologies are mainly divided into three forms: sensible heat storage technology, latent heat storage technology, and thermochemical heat storage technology. Among them, sensible heat storage technology and latent heat storage technology have high temperature requirements for low-grade waste heat resources, making it difficult to achieve on-site utilization of low-grade waste heat resources. In comparison, while thermochemical thermal energy storage technology holds promise for reusing low-grade resources after temperature enhancement, it faces challenges. Thermochemical thermal energy storage is achieved through reversible thermochemical reactions: storing heat through endothermic forward reactions and releasing heat through exothermic reverse reactions. Both forward and reverse reactions have specific temperature requirements. These requirements mean that the working fluid temperature after the low-grade waste heat is enhanced by a single thermochemical thermal energy storage device remains in sensible heat form. This makes it difficult to achieve efficient and continuous thermochemical thermal energy storage / release processes, maximize the enhancement of low-grade waste heat, and address the discontinuity problem of thermochemical thermal energy storage. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the difficulty in achieving efficient and continuous thermochemical reaction heat storage / release process, as well as to maximize the quality improvement of low-grade waste heat and solve the defects of discontinuous thermochemical heat storage.

[0004] To achieve the above objectives, the present invention provides a low-grade thermal upgrading chemical thermal storage system, comprising:

[0005] Low-grade wastewater conveying pipes are suitable for introducing low-grade wastewater.

[0006] Compressed air delivery pipe, suitable for introducing air;

[0007] The humidifier atomizer is connected at one end to both the low-grade wastewater delivery pipe and the compressed air delivery pipe.

[0008] The preheater is connected to the humidifying atomizer;

[0009] The first packed bed module is connected to the preheater at one end via a second valve;

[0010] The second packed bed module is connected to the preheater at one end via the seventh valve; the other end of the second packed bed module is connected to the other end of the first packed bed module via the fourth valve.

[0011] The first packed bed module is adapted to serve as an adsorption bed or a desorption bed, and correspondingly, the second packed bed module is adapted to serve as a desorption bed or an adsorption bed.

[0012] The heat output pipe is connected to the first packed bed module through the third valve, and the heat output pipe is connected to the second packed bed module through the fifth valve.

[0013] Optionally, it also includes:

[0014] The eighth valve and heat exchanger are connected in sequence to the first packed bed module;

[0015] The second packed bed module is connected to the heat exchanger via a sixth valve;

[0016] The heat exchanger is equipped with a drain pipe.

[0017] Optionally, it also includes:

[0018] The buffer tank is connected to both the third and fifth valves at one end, and to the heating output pipe at the other end.

[0019] Optionally, a first valve is provided between the preheater and the humidifying atomizer.

[0020] Optionally, the humidifying atomizer is a double-cone atomizing gas-liquid reactor.

[0021] Optionally, both the adsorption bed and the desorption bed are solid particle packed beds.

[0022] Optionally, the packing material of the solid particle packed bed is a molecular sieve.

[0023] This invention also provides a low-grade thermal upgrading chemical thermal storage method, utilizing the aforementioned low-grade thermal upgrading chemical thermal storage system, comprising the following steps:

[0024] S1. Start the preheater; open the second and fourth valves, and close the seventh, third, and fifth valves; the first packed bed module is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the second packed bed module is a desorption bed that turns the dry air into humid air.

[0025] S2. When the first packed bed module is saturated with adsorption, the preheater and the fourth valve are closed, and the third valve is opened. Atomized air enters the first packed bed module, carries away the adsorption heat, and supplies heat through the heat supply output pipe.

[0026] S3. Start the preheater; open the seventh valve and the fourth valve, and close the second valve, the third valve and the fifth valve; the second packed bed module is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the first packed bed module is a desorption bed that turns the dry air into humid air.

[0027] S4. When the second packed bed module is saturated with adsorption, close the preheater and the fourth valve, open the fifth valve, and atomized air enters the second packed bed module to carry away the adsorption heat and supply heat through the heat supply output pipe.

[0028] S5, Repeat steps S1-S4.

[0029] Optionally, the method further includes the following steps before step S1:

[0030] S0, The second packed bed module is a desorption bed saturated with adsorption humidity.

[0031] This invention also provides a low-grade thermal upgrading chemical thermal storage method, utilizing the aforementioned low-grade thermal upgrading chemical thermal storage system, comprising the following steps:

[0032] S11. Start the preheater; open the second and fourth valves, and close the seventh, third, fifth, and sixth valves; the first packed bed module is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the second packed bed module is a desorption bed that turns the dry air into humid air; open the sixth valve, and the humid air is discharged through the sixth valve and the heat exchanger;

[0033] S12. When the first packed bed module is saturated with adsorption, the preheater and the fourth valve are closed, the third valve is opened, and atomized air enters the first packed bed module to carry away the adsorption heat and supply heat through the heat supply output pipe.

[0034] S13. Start the preheater; open the seventh valve and the fourth valve, and close the second valve, the third valve, the fifth valve, and the eighth valve; the second packed bed module is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the first packed bed module is a desorption bed that turns the dry air into humid air; open the eighth valve, and the humid air is discharged through the eighth valve and the heat exchanger;

[0035] S14. When the second packed bed module is saturated with adsorption, close the preheater and the fourth valve, open the fifth valve, and atomized air enters the second packed bed module to carry away the adsorption heat and supply heat through the heat supply output pipe.

[0036] S15, Repeat steps S11-S14.

[0037] The technical solution of the present invention has the following advantages compared with the prior art:

[0038] 1. The low-grade thermal upgrading chemical thermal storage system provided by the present invention includes: a low-grade wastewater conveying pipe, suitable for introducing low-grade wastewater; a compressed air conveying pipe, suitable for introducing air; a humidifying atomizer, one end of which is connected to both the low-grade wastewater conveying pipe and the compressed air conveying pipe; a preheater, connected to the humidifying atomizer; a first packed bed module, one end of which is connected to the preheater via a second valve; a second packed bed module, one end of which is connected to the preheater via a seventh valve; the other end of the second packed bed module is connected to the other end of the first packed bed module via a fourth valve; the first packed bed module is suitable as an adsorption bed or a desorption bed, and correspondingly, the second packed bed module is suitable as... The application employs the above-mentioned technical solution, in which the first and second packed bed modules are used alternately as adsorption and desorption beds, respectively. This solves the problem of inefficient recovery and utilization of waste heat resources from low-grade wastewater, stabilizes and improves the quality of low-grade heat energy, and enhances the stability of circulating heating. It achieves efficient and continuous thermochemical reaction heat storage / release processes, maximizes the quality improvement of low-grade waste heat, and solves the defect of discontinuous thermochemical heat storage. Furthermore, it uses air and water as the direct working medium, ensuring safety and efficiency.

[0039] 2. The low-grade thermal upgrading chemical thermal storage system provided by the present invention further includes: an eighth valve and a heat exchanger connected in sequence to the first packed bed module; the second packed bed module is connected to the heat exchanger through a sixth valve; and an vent pipe is provided on the heat exchanger; the present application adopts the above technical solution to facilitate the reuse of the humid air after use through the heat exchanger and venting it.

[0040] 3. The low-grade thermal upgrading chemical thermal storage system provided by the present invention further includes: a buffer tank, one end of which is connected to both the third valve and the fifth valve, and the other end of which is connected to the heat supply output pipe; the present application adopts the above technical solution to temporarily store a certain amount of thermal energy through the buffer tank for convenient centralized utilization.

[0041] 4. The present invention provides a first valve between the preheater and the humidifying atomizer; the present application adopts the above technical solution, and the first valve facilitates the opening or closing of the low-grade heat upgrading chemical thermal storage system of the present application.

[0042] 5. The humidifying atomizer described in this invention is a double-cone atomizing gas-liquid reactor; this application adopts the above technical solution to improve the mixing and dispersion effect of low-grade wastewater in the air, which is beneficial to the rapid and complete progress of subsequent reactions.

[0043] 6. Both the adsorption bed and the desorption bed described in this invention are solid particle packed beds; this application adopts the above technical solution to increase the contact area of ​​the reaction and improve the reaction rate.

[0044] 7. The packing material of the solid particle packed bed described in this invention is a molecular sieve; this application adopts the above technical solution to improve the adsorption rate, regeneration times, crush resistance and anti-pollution ability.

[0045] 8. The low-grade thermal upgrading chemical thermal storage method provided by the present invention, utilizing the aforementioned low-grade thermal upgrading chemical thermal storage system, includes the following steps: S1. Turning on the preheater; opening the second and fourth valves, and closing the seventh, third, and fifth valves; the first packed bed module is an adsorption bed layer, which adsorbs water into heated atomized air and generates adsorption heat, turning humid air into dry air; the second packed bed module is a desorption bed layer, which turns dry air into humid air; S2. When the first packed bed module is saturated with adsorption, closing the preheater and the fourth valve, opening the third valve, allowing atomized air to enter the first packed bed module, carrying away the adsorption heat, and supplying heat through the heating output pipe; S3. Turning on the preheater; opening the seventh and fourth valves, and closing the second, third, and fifth valves; the second packed bed module is an adsorption bed layer, which adsorbs water into heated atomized air. The adsorption heat is generated, and the humid air becomes dry air; the first packed bed module is a desorption bed, which turns the dry air into humid air; S4, when the second packed bed module is saturated with adsorption, the preheater and the fourth valve are closed, the fifth valve is opened, and the atomized air enters the second packed bed module, carrying away the adsorption heat, and supplying heat through the heat supply output pipe; S5, the steps S1-S4 are repeated; This application adopts the above technical solution, in which the first packed bed module and the second packed bed module are used alternately as adsorption bed and desorption bed, respectively; it solves the problem of inefficient recovery and utilization of waste heat resources from low-grade wastewater, stabilizes and improves the quality of low-grade heat energy, and improves the stability of circulating heating; it realizes the efficient and continuous operation of the thermochemical reaction heat storage / release process, maximizes the quality improvement of low-grade waste heat and solves the defect of discontinuous thermochemical heat storage; at the same time, it uses air and water as direct working media, which is safe and efficient.

[0046] 9. Before step S1, the present invention further includes: S0, the second packed bed module is a desorption bed layer with adsorption humidity saturation; the present application adopts the above technical solution to ensure that the second packed bed module has sufficient initial humidity.

[0047] 10. The low-grade thermal upgrading chemical thermal storage method provided by the present invention utilizes the aforementioned low-grade thermal upgrading chemical thermal storage system, comprising the following steps: S11, starting the preheater; opening the second and fourth valves, and closing the seventh, third, fifth, and sixth valves; the first packed bed module is an adsorption bed layer, which adsorbs water into heated atomized air and generates adsorption heat, turning humid air into dry air; the second packed bed module is a desorption bed layer, which turns dry air into humid air; opening the sixth valve, the humid air is discharged through the sixth valve and the heat exchanger; S12, when the first packed bed module is saturated with adsorption, closing the preheater and the fourth valve, opening the third valve, the atomized air enters the first packed bed module, carrying away the adsorption heat, and supplying heat through the heat supply output pipe; S13 1. Start the preheater; open the seventh and fourth valves, and close the second, third, fifth, and eighth valves; the second packed bed module is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the first packed bed module is a desorption bed that turns the dry air into humid air; open the eighth valve, and the humid air is discharged through the eighth valve and the heat exchanger; S14. When the second packed bed module is saturated with adsorption, close the preheater and the fourth valve, open the fifth valve, and the atomized air enters the second packed bed module, carrying away the adsorption heat and supplying heat through the heat supply output pipe; S15. Repeat steps S11-S14; This application adopts the above technical solution, which facilitates the reuse of the humid air after use through the heat exchanger and discharge. Attached Figure Description

[0048] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art 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.

[0049] Figure 1 This is a schematic diagram of the connection structure of the low-grade thermal upgrading chemical thermal storage system provided in an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Low-grade wastewater conveying pipe; 2. Compressed air conveying pipe; 3. Humidifier atomizer; 4. First valve; 5. Preheater; 6. Second valve; 7. First packed bed module; 8. Third valve; 9. Buffer tank; 10. Heat output pipe; 11. Fourth valve; 12. Fifth valve; 13. Second packed bed module; 14. Sixth valve; 15. Seventh valve; 16. Heat exchanger; 17. Eighth valve; 18. Drain pipe. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] like Figure 1 A specific embodiment of the low-grade thermal upgrading chemical thermal storage system shown includes: a low-grade wastewater conveying pipe 1, a humidifier atomizer 3, a first valve 4, a preheater 5, a second valve 6, a first packed bed module 7, a fourth valve 11, a second packed bed module 13, and a seventh valve 15 connected in sequence; a third valve 8, a buffer tank 9, and a heat supply output pipe 10 connected in sequence; an eighth valve 17, a heat exchanger 16, and a sixth valve 14 connected in sequence; and a compressed air conveying pipe 2 connected to the humidifier atomizer 3; specifically, the humidifier atomizer 3 is a double-cone atomizing gas-liquid reactor.

[0057] The low-grade wastewater conveying pipe 1 is suitable for introducing low-grade wastewater containing low-grade heat; the compressed air conveying pipe 2 is suitable for introducing air; one end of the first packed bed module 7 is connected to the preheater 5 through the second valve 6; one end of the second packed bed module 13 is connected to the preheater 5 through the seventh valve 15; the other end of the second packed bed module 13 is connected to the other end of the first packed bed module 7 through the fourth valve 11. The first packed bed module 7 is suitable as an adsorption bed or a desorption bed, and correspondingly, the second packed bed module 13 is suitable as a desorption bed or an adsorption bed. Specifically, both the adsorption bed and the desorption bed are solid particle packed beds. The filler material of the solid particle packed bed is a molecular sieve and a modified material. Specifically, the molecular sieve includes: type A molecular sieve, type X zeolite molecular sieve with a silicon-to-alumina ratio in the range of 1.0 to 1.5, sodium calcium exchange molecular sieve, sodium magnesium exchange molecular sieve, sodium barium exchange molecular sieve, sodium strontium exchange molecular sieve, hydrotalcite-coated molecular sieve, calcium aluminate-coated molecular sieve, and calcium aluminate-coated molecular sieve, etc. More specifically, the type A molecular sieve is a 3A molecular sieve. The heat output pipe 10 is connected to the first packed bed module 7 through the third valve 8, and the heat output pipe 10 is connected to the second packed bed module 13 through the fifth valve 12. The first packed bed module 7 is sequentially connected to the eighth valve 17 and the heat exchanger 16; the second packed bed module 13 is connected to the heat exchanger 16 through the sixth valve 14. An vent pipe 18 is provided on the heat exchanger 16. One end of the buffer tank 9 is connected to both the third valve 8 and the fifth valve 12, and the other end of the buffer tank 9 is connected to the heat supply output pipe 10.

[0058] This invention also provides a low-grade thermal upgrading chemical thermal storage method, utilizing the aforementioned low-grade thermal upgrading chemical thermal storage system, comprising the following steps:

[0059] S0, the second packed bed module 13 is a desorption bed saturated with adsorption humidity.

[0060] S1. Start the preheater 5; open the second valve 6 and the fourth valve 11, and close the seventh valve 15, the third valve 8 and the fifth valve 12; the first packed bed module 7 is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the second packed bed module 13 is a desorption bed that turns the dry air into humid air.

[0061] S2. When the first packed bed module 7 is saturated with adsorption, the preheater 5 and the fourth valve 11 are closed, and the third valve 8 is opened. Atomized air enters the first packed bed module 7, carries away the adsorption heat, and supplies heat through the heat supply output pipe 10.

[0062] S3. Start the preheater 5; open the seventh valve 15 and the fourth valve 11, and close the second valve 6, the third valve 8 and the fifth valve 12; the second packed bed module 13 is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the first packed bed module 7 is a desorption bed that turns the dry air into humid air.

[0063] S4. When the second packed bed module 13 is saturated with adsorption, the preheater 5 and the fourth valve 11 are closed, and the fifth valve 12 is opened. Atomized air enters the second packed bed module 13, carries away the adsorption heat, and supplies heat through the heat supply output pipe 10.

[0064] S5, Repeat steps S1-S4.

[0065] This invention also provides a low-grade thermal upgrading chemical thermal storage method, utilizing the aforementioned low-grade thermal upgrading chemical thermal storage system, comprising the following steps:

[0066] S11. Start the preheater 5; open the second valve 6 and the fourth valve 11, and close the seventh valve 15, the third valve 8, the fifth valve 12 and the sixth valve 14; the first packed bed module 7 is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the second packed bed module 13 is a desorption bed that turns the dry air into humid air; open the sixth valve 14, and the humid air is discharged through the sixth valve 14 and the heat exchanger 16;

[0067] S12. When the first packed bed module 7 is saturated with adsorption, the preheater 5 and the fourth valve 11 are closed, and the third valve 8 is opened. Atomized air enters the first packed bed module 7, carries away the adsorption heat, and supplies heat through the heat supply output pipe 10.

[0068] S13. Start the preheater 5; open the seventh valve 15 and the fourth valve 11, and close the second valve 6, the third valve 8, the fifth valve 12 and the eighth valve 17; the second packed bed module 13 is an adsorption bed that adsorbs water into the heated atomized air and generates adsorption heat, turning the humid air into dry air; the first packed bed module 7 is a desorption bed that turns the dry air into humid air; open the eighth valve 17, and the humid air is discharged through the eighth valve 17 and the heat exchanger 16;

[0069] S14. When the second packed bed module 13 is saturated with adsorption, the preheater 5 and the fourth valve 11 are closed, and the fifth valve 12 is opened. Atomized air enters the second packed bed module 13, carries away the adsorption heat, and supplies heat through the heat supply output pipe 10.

[0070] S15, Repeat steps S11-S14.

[0071] The main working process of the low-grade thermal upgrading chemical thermal storage system described in this application is briefly described below:

[0072] First, low-grade wastewater, serving as a heat source, is mixed and atomized with air in different proportions in humidifier 3. The first valve 4 opens, and the mixed humidified atomized air is preheated in preheater 5. It then passes through the second valve 6 into the first packed bed module 7, which serves as the adsorption bed. In the first packed bed module 7, the heated atomized air undergoes water adsorption, generating adsorption heat, and the humid air becomes dry air. At this time, the third valve 8 closes, and the fourth valve 11 opens. The dry air passes through the second packed bed module 13 (initialized as a desorption bed saturated with adsorption humidity). In the second packed bed module 13, the dry air removes water from the bed under low pressure, becoming humid air, and is then discharged through the sixth valve 14 and heat exchanger 16. After the first packed bed module 7 becomes saturated with adsorption, the preheater 5 closes, the third valve 8 opens, and the fourth valve 11 closes. The humid air enters the first packed bed module 7, carrying away the adsorption heat, and is then supplied with heat after the temperature is raised.

[0073] Then, the functions of the first packed bed module 7 and the second packed bed module 13 are interchanged. The first valve 4 is opened, and the mixed humidified atomized air is preheated in the preheater 5. It then enters the second packed bed module 13 through the seventh valve 15 (after the aforementioned process, the second packed bed module 13 has become an adsorption bed). In the second packed bed module 13, the pressurized atomized air undergoes water adsorption, generating adsorption heat, and the humid air becomes dry air. At this time, the fifth valve 12 is closed, and the fourth valve 11 is opened. The dry air passes through the first packed bed module 7 (after the aforementioned process, the first packed bed module 7 has become a desorption bed saturated with adsorption humidity). In the first packed bed module 7, the dry air carries water from the desorption bed, becoming humid air, and is then discharged through the eighth valve 17 and the heat exchanger 16. After the second packed bed module 13 becomes saturated with adsorption, the preheater 5 is closed, the fifth valve 12 is opened, and the fourth valve 11 is closed. The humid air enters the second packed bed module 13, carrying away the adsorption heat, and is then supplied with heat after the temperature is raised.

[0074] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A low grade heat upgrading chemical heat storage system, characterized by, The application relates to a low-grade wastewater heat recovery device. The device comprises: a low-grade wastewater conveying pipe (1) adapted to introduce low-grade wastewater; a compressed air conveying pipe (2) adapted to introduce air; a humidifying atomizer (3) connected with the low-grade wastewater conveying pipe (1) and the compressed air conveying pipe (2) at one end; a preheater (5) connected with the humidifying atomizer (3); a first packed bed module (7) connected with the preheater (5) at one end through a second valve (6); a second packed bed module (13) connected with the preheater (5) at one end through a seventh valve (15); the other end of the second packed bed module (13) is connected with the other end of the first packed bed module (7) through a fourth valve (11); the first packed bed module (7) is adapted to be an adsorption bed or a desorption bed, and correspondingly, the second packed bed module (13) is adapted to be a desorption bed or an adsorption bed; 2. The low-grade heat upgrading chemical storage system of claim 1, wherein, a heat supply output pipe (10) connected with the first packed bed module (7) through a third valve (8), and the heat supply output pipe (10) is connected with the second packed bed module (13) through a fifth valve (12). The device further comprises: an eighth valve (17) and a heat exchanger (16) connected with the first packed bed module (7) in sequence; the second packed bed module (13) is connected with the heat exchanger (16) through a sixth valve (14); 3. The low-grade heat upgrading chemical storage system of claim 1, wherein, an exhaust pipe (18) is arranged on the heat exchanger (16). The device further comprises:

4. The low-grade heat upgrading chemical storage system of claim 1, wherein, a buffer tank (9) connected with the third valve (8) and the fifth valve (12) at one end, and connected with the heat supply output pipe (10) at the other end.

5. The low-grade heat upgrading chemical heat storage system according to any one of claims 1 to 4, characterized in that, A first valve (4) is arranged between the preheater (5) and the humidifying atomizer (3).

6. The low-grade heat upgrading chemical heat storage system according to any one of claims 1 to 4, characterized in that, The humidifying atomizer (3) is a double-cone atomizing gas-liquid reactor.

7. The low-grade heat upgrading chemical storage system of claim 6, wherein, The adsorption bed and the desorption bed are both solid particle packed beds.

8. A low-grade heat upgrading chemical heat storage method, using the low-grade heat upgrading chemical heat storage system according to any one of claims 1-7, characterized in that, The packing of the solid particle packed bed is molecular sieve. The device comprises the following steps: S1, the preheater (5) is started; the second valve (6) and the fourth valve (11) are opened, and the seventh valve (15), the third valve (8) and the fifth valve (12) are closed; the first packed bed module (7) is an adsorption bed, water adsorption is carried out on the atomized air after heating, and adsorption heat is generated, and the wet air becomes dry air; the second packed bed module (13) is a desorption bed, and the dry air becomes humid air; S2, when the first packed bed module (7) is saturated, the preheater (5) and the fourth valve (11) are closed, and the third valve (8) is opened; the atomized air enters the first packed bed module (7), and the adsorption heat is taken away, and heat is supplied through the heat supply output pipe (10); S3, the preheater (5) is started; the seventh valve (15) and the fourth valve (11) are opened, and the second valve (6), the third valve (8) and the fifth valve (12) are closed; the second packed bed module (13) is an adsorption bed, water adsorption is carried out on the atomized air after heating, and adsorption heat is generated, and the wet air becomes dry air; the first packed bed module (7) is a desorption bed, and the dry air becomes humid air. S4, when the second packed bed module (13) is saturated, the preheater (5) and the fourth valve (11) are closed, the fifth valve (12) is opened, the atomized air enters the second packed bed module (13) to take away the adsorption heat, and the heat is supplied through the heat supply output pipe (10); S5, the steps S1-S4 are repeated.

9. The low-grade heat upgrading chemical heat storage method according to claim 8, characterized in that, Before the step S1, the following steps are further included: S0, the second packed bed module (13) is a desorption bed layer saturated with humidity.

10. A low-grade heat upgrading chemical heat storage method using the low-grade heat upgrading chemical heat storage system according to claim 2, characterized by, The following steps are included: S11, the preheater (5) is opened; the second valve (6) and the fourth valve (11) are opened, and the seventh valve (15), the third valve (8), the fifth valve (12) and the sixth valve (14) are closed; the first packed bed module (7) is an adsorption bed layer, the water adsorption is performed on the heated atomized air, and the adsorption heat is generated, and the wet air becomes dry air; the second packed bed module (13) is a desorption bed layer, and the dry air becomes the wet air; The sixth valve (14) is opened, and the wet air is discharged through the sixth valve (14) and the heat exchanger (16); S12, when the first packed bed module (7) is saturated, the preheater (5) and the fourth valve (11) are closed, the third valve (8) is opened, the atomized air enters the first packed bed module (7) to take away the adsorption heat, and the heat is supplied through the heat supply output pipe (10); S13, the preheater (5) is opened; the seventh valve (15) and the fourth valve (11) are opened, and the second valve (6), the third valve (8), the fifth valve (12) and the eighth valve (17) are closed; the second packed bed module (13) is an adsorption bed layer, the water adsorption is performed on the heated atomized air, and the adsorption heat is generated, and the wet air becomes dry air; the first packed bed module (7) is a desorption bed layer, and the dry air becomes the wet air; The eighth valve (17) is opened, and the wet air is discharged through the eighth valve (17) and the heat exchanger (16); S14, when the second packed bed module (13) is saturated, the preheater (5) and the fourth valve (11) are closed, the fifth valve (12) is opened, the atomized air enters the second packed bed module (13) to take away the adsorption heat, and the heat is supplied through the heat supply output pipe (10); S15, the steps S11-S14 are repeated.

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