Thermochemical energy storage heat supply system with ejector and method

Abstract

The invention discloses a thermochemical energy storage heat supply system with an ejector and a method. The thermochemical energy storage heat supply system comprises a water storage tank, a water pump, an electric heater, a thermochemical reactor, a heat exchanger and the ejector. An outlet of the water storage tank is divided into three paths through the water pump, the first path is communicated with a shell side inlet of the thermochemical reactor through the electric heater, the second path is communicated with a pipe side inlet of the thermochemical reactor, the third path is communicated with an inlet of the heat exchanger, and a pipe side outlet of the thermochemical reactor is communicated with an inlet of the heat exchanger. An outlet of the heat exchanger is communicated with an inlet of the water storage tank and an inlet of the ejector, a shell side outlet of the thermochemical reactor is communicated with the inlet of the ejector, an outlet of the ejector is communicated with the inlet of the water storage tank, and by means of the system and method, the outward flowing speed of water vapor in the thermochemical reactor can be increased, and the utilization efficiency of energy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and relates to a thermochemical energy storage heating system with an ejector and a method thereof. Background Art

[0002] Thermochemical energy storage heating is a thermal energy storage and supply technology based on a chemical reaction process. Thermochemical energy storage heating uses reversible chemical reactions to store and release heat. In the endothermic reaction stage, chemical energy storage materials absorb heat and undergo chemical reactions, storing energy in the form of chemical energy in the products. When heat is needed, these products undergo a reverse reaction under appropriate conditions to release the stored heat. However, during use, the water vapor generated in the thermochemical reactor flows out slowly, resulting in reduced energy utilization efficiency. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a thermochemical energy storage heating system and method with an ejector, which can increase the outflow rate of water vapor in the thermochemical reactor and improve the energy utilization efficiency.

[0004] To achieve the above-mentioned purpose, the present invention discloses a thermochemical energy storage and heating system with an ejector, comprising a water storage tank, a water pump, an electric heater, a thermochemical reactor, a heat exchanger and an ejector;

[0005] The outlet of the water storage tank is divided into three routes through a water pump, wherein the first route is connected to the shell side inlet of the thermochemical reactor through an electric heater, the second route is connected to the tube side inlet of the thermochemical reactor, and the third route is connected to the inlet of the heat exchanger. The tube side outlet of the thermochemical reactor is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the inlet of the water storage tank and the inlet of the ejector, the shell side outlet of the thermochemical reactor is connected to the inlet of the ejector, and the outlet of the ejector is connected to the inlet of the water storage tank.

[0006] As a further improvement of the thermochemical energy storage heating system with ejector of the present invention,

[0007] Furthermore, a first regulating valve is provided on the third path.

[0008] Furthermore, the outlet of the heat exchanger is connected to the inlet of the water storage tank via a second regulating valve.

[0009] Furthermore, a third regulating valve is provided on the second path.

[0010] Furthermore, the outlet of the heat exchanger is connected to the inlet of the ejector via a first switching valve.

[0011] Furthermore, a second switching valve is provided at the tube-side outlet of the thermochemical reactor.

[0012] Furthermore, the thermochemical reactor is provided with an electric heating device.

[0013] Furthermore, the reaction medium in the thermochemical reactor is a calcium hydroxide / calcium oxide or magnesium hydroxide / magnesium oxide system.

[0014] Furthermore, a heat storage material is provided on the outer wall of the tube side in the thermochemical reactor.

[0015] The present invention discloses a thermochemical energy storage and heating method with an ejector, comprising the following steps:

[0016] During the heat storage process, the electric heating device of the thermochemical reactor is started to decompose the heat storage medium to generate water vapor, the water pump is started, the first regulating valve is opened, the second regulating valve is closed, the third regulating valve is opened, and the water vapor in the thermochemical reactor is ejected by the ejector using the feed water and sent to the water storage tank to heat the feed water;

[0017] During the heat release process, start the water pump, open the third regulating valve, close the ejector, close the first switch valve, open the second switch valve, start the electric heater, and part of the feed water is heated into steam through the electric heater and then enters the thermochemical reactor. The other part of the feed water passes through the third regulating valve into the thermochemical reactor and is heated, and then enters the heat exchanger.

[0018] The present invention has the following beneficial effects:

[0019] During specific operation, the thermochemical energy storage and heating system and method with an ejector described in the present invention outputs feed water from a water storage tank, part of which enters the thermochemical reactor through a water pump, and part of which enters the ejector. The feed water is used to eject water vapor in the thermochemical reactor through the ejector and is sent into the water storage tank to heat the feed water, thereby accelerating the outflow rate of water vapor in the thermochemical reactor and improving energy utilization efficiency. The structure is simple and the practicability is extremely strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural diagram of the present invention.

[0022] Among them, 1 is a water storage tank, 2 is a water pump, 3 is a first regulating valve, 4 is a thermochemical reactor, 5 is an ejector, 6 is a heat exchanger, 7 is a second regulating valve, 8 is a first switching valve, 9 is a third regulating valve, 10 is an electric heater, and 11 is a second switching valve. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it is to be understood that the terms “include” and “comprise” 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 collections thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should be further understood that the term "and / or" as used in the present specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0027] It should be understood that although the terms "first," "second," and "third" may be used to describe preset ranges in embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are merely used to distinguish one preset range from another. For example, without departing from the scope of 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.

[0028] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0029] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0031] Example 1

[0032] refer to Figure 1 The thermochemical energy storage and heating system with an ejector described in the present invention includes a water storage tank 1, a water pump 2, an electric heater 10, a thermochemical reactor 4, a heat exchanger 6 and an ejector 5; the outlet of the water storage tank 1 is divided into three routes through the water pump 2, wherein the first route is connected to the shell side inlet of the thermochemical reactor 4 through the electric heater 10, the second route is connected to the tube side inlet of the thermochemical reactor 4, and the third route is connected to the inlet of the heat exchanger 6. The tube side outlet of the thermochemical reactor 4 is connected to the inlet of the heat exchanger 6, the outlet of the heat exchanger 6 is connected to the inlet of the water storage tank 1 and the inlet of the ejector 5, the shell side outlet of the thermochemical reactor 4 is connected to the inlet of the ejector 5, and the outlet of the ejector 5 is connected to the inlet of the water storage tank 1.

[0033] Example 2

[0034] refer to Figure 1The thermochemical energy storage and heating system with an ejector of the present invention includes a water storage tank 1, a water pump 2, a first regulating valve 3, a thermochemical reactor 4, an ejector 5, a heat exchanger 6, a second regulating valve 7, a first on-off valve 8, a third regulating valve 9, an electric heater 10 and a second on-off valve 11;

[0035] The outlet of the water storage tank 1 is divided into three routes through the water pump 2, wherein the first route is connected to the shell side inlet of the thermochemical reactor 4 through the electric heater 10, the second route is connected to the tube side inlet of the thermochemical reactor 4, and the third route is connected to the inlet of the heat exchanger 6. The tube side outlet of the thermochemical reactor 4 is connected to the inlet of the heat exchanger 6, the outlet of the heat exchanger 6 is connected to the inlet of the water storage tank 1 and the inlet of the ejector 5, the shell side outlet of the thermochemical reactor 4 is connected to the inlet of the ejector 5, and the outlet of the ejector 5 is connected to the inlet of the water storage tank 1.

[0036] As an embodiment of the present invention, a third regulating valve 9 is provided on the second path.

[0037] As an embodiment of the present invention, a first regulating valve 3 is provided on the third path.

[0038] As an embodiment of the present invention, a second switching valve 11 is provided at the tube-side outlet of the thermochemical reactor 4 .

[0039] As an embodiment of the present invention, the outlet of the heat exchanger 6 is connected to the inlet of the water storage tank 1 through the second regulating valve 7 .

[0040] As an embodiment of the present invention, the outlet of the heat exchanger 6 is connected to the inlet of the ejector 5 via the first switching valve 8 .

[0041] As an embodiment of the present invention, the reaction medium in the thermochemical reactor 4 is a calcium hydroxide / calcium oxide or magnesium hydroxide / magnesium oxide system.

[0042] As an embodiment of the present invention, an electric heating device is provided in the thermochemical reactor 4 .

[0043] As an embodiment of the present invention, a heat storage material is provided on the outer wall of the tube side of the thermochemical reactor 4 .

[0044] As an embodiment of the present invention, it also includes a controller, which is connected to the water pump 2, the first regulating valve 3, the ejector 5, the second regulating valve 7, the first switch valve 8, the third regulating valve 9, the electric heater 10 and the second switch valve 11, and the water pump 2, the first regulating valve 3, the ejector 5, the second regulating valve 7, the first switch valve 8, the third regulating valve 9, the electric heater 10 and the second switch valve 11 are controlled by the controller.

[0045] Example 3

[0046] refer to Figure 1 The thermochemical energy storage and heating method with an ejector of the present invention is implemented based on the thermochemical energy storage and heating system with an ejector. The thermochemical energy storage and heating system with an ejector includes a water storage tank 1, a water pump 2, a first regulating valve 3, a thermochemical reactor 4, an ejector 5, a heat exchanger 6, a second regulating valve 7, a first switch valve 8, a third regulating valve 9, an electric heater 10 and a second switch valve 11; the outlet of the water storage tank 1 is divided into three paths through the water pump 2, wherein the first path is connected to the shell side inlet of the thermochemical reactor 4 through the electric heater 10, the second path is connected to the tube side inlet of the thermochemical reactor 4, and the third path is connected to the tube side inlet of the thermochemical reactor 4. The three routes are connected to the inlet of the heat exchanger 6, the tube side outlet of the thermochemical reactor 4 is connected to the inlet of the heat exchanger 6, the outlet of the heat exchanger 6 is connected to the inlet of the water storage tank 1 and the inlet of the ejector 5, the shell side outlet of the thermochemical reactor 4 is connected to the inlet of the ejector 5, and the outlet of the ejector 5 is connected to the inlet of the water storage tank 1; a third regulating valve 9 is provided on the second route; a first regulating valve 3 is provided on the third route; a second switch valve 11 is provided at the tube side outlet of the thermochemical reactor 4; the outlet of the heat exchanger 6 is connected to the inlet of the water storage tank 1 via the second regulating valve 7; the outlet of the heat exchanger 6 is connected to the inlet of the ejector 5 via the first switch valve 8.

[0047] Specifically, the thermochemical energy storage and heating method with an ejector includes the following steps: during the heat storage process, starting the electric heating device of the thermochemical reactor 4 to decompose the heat storage medium and generate water vapor, starting the water pump 2, opening the first regulating valve 3, closing the second regulating valve 7, and opening the third regulating valve 9, using the feed water to eject the water vapor in the thermochemical reactor 4, and the mixed steam enters the water storage tank 1 to heat the feed water, and by changing the outlet flow f of the water pump 2 and the power W1 of the electric heating in the thermochemical reactor 4, the inlet water temperature of the hot water entering the heat exchanger 6 is stabilized, that is, W1 / f=aΔT, where a is the heat capacity of water and ΔT is the inlet and outlet temperature difference of the feed water in the heat exchanger 6. At this time, the inlet temperature of the hot water entering the heat exchanger 6 can be stabilized and the heat exchange power can be continuously adjusted.

[0048] During the heat release process, start the water pump 2, open the third regulating valve 9, close the ejector 5, close the first switch valve 8, open the second switch valve 11, start the electric heater 10, part of the feed water is heated to steam by the electric heater 10, and then enters the thermochemical reactor 4, and the other part of the feed water passes through the third regulating valve 9 into the thermochemical reactor 4 for heating, and then enters the heat exchanger 6. The temperature stability of the hot working medium entering the heat exchanger 6 can be achieved by regulating the flow rate of hot and cold feed water by adjusting the opening k1 of the first regulating valve 3 and the opening k2 of the third regulating valve 9, that is, the hot water power W2 entering the heat exchanger 4 = k1q1 + k2q2, where q1 = a1fTw + a2fTr, Tw is the temperature of the water storage tank 1, and Tr is the outlet hot water temperature of the thermochemical reactor 4.

[0049] It should be noted that the present invention has the following characteristics:

[0050] 1) The present invention can realize 24-hour heating with green electricity, and is suitable for heating scenarios and emergency protection scenarios.

[0051] 2) The present invention combines thermochemical energy storage, an ejector 5, and a water storage tank 1 to achieve an energy utilization efficiency exceeding 95%. In addition, the system forms a flexible flow network through valves and a water pump 2, reducing the number of related equipment.

[0052] 3) The present invention is a closed cycle and can be processed into a mobile heat source vehicle in a skid-mounted form.

[0053] 4) The present invention achieves stability of the heat exchange power in the heat exchanger 6 through the designed flow network.

[0054] Example 4

[0055] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the thermochemical energy storage and heat supply method with an ejector are implemented. For example, the steps include: during the heat storage process, the hot water inlet temperature entering the heat exchanger 6 is stabilized by changing the opening of the second regulating valve 7 and the power of the electric heater in the thermochemical reactor 4; during the heat release process, the temperature of the hot working medium entering the heat exchanger 6 is stabilized by regulating the opening of the first regulating valve 3 and the third regulating valve 9 to control the flow rate of hot and cold water. The memory may include a memory, such as a high-speed random access memory, or may also include a non-volatile memory, such as at least one disk drive. The processor, network interface, and memory are interconnected via an internal bus, which may be an industrial standard architecture bus, a peripheral component interconnect standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the programs may include program code, and the program code includes computer operating instructions. The memory may include both memory and non-volatile memory, and provides instructions and data to the processor.

[0056] Example 5

[0057] A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the thermochemical energy storage and heat supply method with an ejector, including, for example: during the heat storage process, stabilizing the hot water inlet temperature entering the heat exchanger 6 by changing the opening of the second regulating valve 7 and the power of the electric heating in the thermochemical reactor 4; during the heat release process, stabilizing the temperature of the hot working medium entering the heat exchanger 6 can be achieved by regulating the hot and cold water flow rates by adjusting the opening of the first regulating valve 3 and the third regulating valve 9. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0058] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0059] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0060] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0061] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0062] Those skilled in the art will readily identify other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0063] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0064] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A thermochemical energy storage heating system with an ejector, characterized in that: It comprises a water storage tank (1), a water pump (2), an electric heater (10), a thermochemical reactor (4), a heat exchanger (6) and an ejector (5); The outlet of the water storage tank (1) is divided into three paths through the water pump (2), wherein the first path is connected to the shell side inlet of the thermochemical reactor (4) through the electric heater (10), the second path is connected to the tube side inlet of the thermochemical reactor (4), and the third path is connected to the inlet of the heat exchanger (6). The tube side outlet of the thermochemical reactor (4) is connected to the inlet of the heat exchanger (6), the outlet of the heat exchanger (6) is connected to the inlet of the water storage tank (1) and the inlet of the ejector (5), the shell side outlet of the thermochemical reactor (4) is connected to the inlet of the ejector (5), and the outlet of the ejector (5) is connected to the inlet of the water storage tank (1).

2. The thermochemical energy storage and heating system with ejector according to claim 1, characterized in that: The third path is provided with a first regulating valve (3).

3. The thermochemical energy storage heating system with ejector according to claim 2, characterized in that: The outlet of the heat exchanger (6) is connected to the inlet of the water storage tank (1) via a second regulating valve (7).

4. The thermochemical energy storage heating system with ejector according to claim 3 is characterized in that: A third regulating valve (9) is provided on the second path.

5. The thermochemical energy storage heating system with ejector according to claim 4, characterized in that: The outlet of the heat exchanger (6) is connected to the inlet of the ejector (5) via the first switching valve (8).

6. The thermochemical energy storage heating system with ejector according to claim 5, characterized in that: A second switching valve (11) is provided at the tube-side outlet of the thermochemical reactor (4).

7. The thermochemical energy storage heating system with ejector according to claim 1, characterized in that: The thermochemical reactor (4) is provided with an electric heating device.

8. The thermochemical energy storage and heating system with ejector according to claim 1, characterized in that: The reaction medium in the thermochemical reactor (4) is a calcium hydroxide / calcium oxide or magnesium hydroxide / magnesium oxide system.

9. The thermochemical energy storage heating system with ejector according to claim 1, characterized in that: Heat storage material is provided on the outer wall of the tube side of the thermochemical reactor (4).

10. A thermochemical energy storage heating method with an ejector, characterized in that: The thermochemical energy storage and heating system with an ejector according to claim 6 comprises the following steps: During the heat storage process, the electric heating device of the thermochemical reactor (4) is started to decompose the heat storage medium to generate water vapor, the water pump (2) is started, the first regulating valve (3) is opened, the second regulating valve (7) is closed, the third regulating valve (9) is opened, and the water vapor in the thermochemical reactor (4) is ejected by the ejector (5) using the feed water and sent to the water storage tank (1) to heat the feed water; During the heat release process, the water pump (2) is started, the third regulating valve (9) is opened, the ejector (5) is closed, the first switch valve (8) is closed, the second switch valve (11) is opened, and the electric heater (10) is started. Part of the feed water is heated to steam by the electric heater (10) and then enters the thermochemical reactor (4). The other part of the feed water enters the thermochemical reactor (4) through the third regulating valve (9) and is heated, and then enters the heat exchanger (6).

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