Double-pump thermochemical energy storage heat supply system and method

Abstract

The invention discloses a double-pump thermochemical energy storage heat supply system and method. The double-pump thermochemical energy storage heat supply system comprises a water storage tank, an electric heater, a thermochemical reactor, a heat exchanger, a second water pump and an ejector. An outlet of the water storage tank is divided into three paths, 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, a pipe side outlet of the thermochemical reactor is communicated with an inlet of the heat exchanger, and the third path 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, an outlet of the water storage tank is communicated with an inlet of the ejector through the second water pump, a shell side outlet of the thermochemical reactor is communicated with the inlet of the ejector, and an outlet of the ejector is communicated with the inlet of the water storage tank. According to the system and method, the temperature of hot water at an inlet of the heat exchanger is stable in the heat absorption process, the heat exchange power is continuous, and meanwhile the temperature of hot working media entering the heat exchanger is stable in the heat release process.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and relates to a dual-pump thermochemical energy storage heating system and method. 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, the chemical energy storage material absorbs heat and undergoes a chemical reaction, storing the energy in the form of chemical energy in the product. When heat is needed, these products undergo a reverse reaction under appropriate conditions to release the stored heat. However, due to the uncontrollable heat storage and heat release processes of the thermochemical reactor, the temperature of the hot water at the heat exchanger inlet is unstable during the endothermic process, and the heat exchange power is discontinuous. At the same time, during the heat release process, the temperature of the hot working fluid entering the heat exchanger is unstable. 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 dual-pump thermochemical energy storage heating system and method. The system and method can stabilize the temperature of the hot water at the inlet of the heat exchanger during the heat absorption process and the heat exchange power is continuous. At the same time, during the heat release process, the temperature of the hot working medium entering the heat exchanger is stable.

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

[0005] The outlet of the water storage tank is divided into three routes, wherein the first route is connected to the shell side inlet of the thermochemical reactor through the electric heater, the second route is connected to the tube side inlet of the thermochemical reactor, the tube side outlet of the thermochemical reactor is connected to the inlet of the heat exchanger, the third route 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, the outlet of the water storage tank is connected to the inlet of the ejector through the second water pump, 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] A further improvement of the dual-pump thermochemical energy storage heating system of the present invention is:

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

[0008] Furthermore, a second regulating valve is provided on the second path.

[0009] Furthermore, a switch valve is provided at the tube-side outlet of the thermochemical reactor.

[0010] Furthermore, the reaction medium in the thermochemical reactor is a hydroxide system.

[0011] Furthermore, the thermochemical reactor is provided with an electric heating device.

[0012] Furthermore, heat storage material is arranged on the outer side of the tube in the thermochemical reactor.

[0013] Furthermore, it also includes a controller, which is connected to the electric heating device, the first water pump, the first regulating valve, the second water pump, the second regulating valve, the electric heater and the switch valve.

[0014] The present invention discloses a dual-pump thermochemical energy storage heating method, comprising the following steps:

[0015] During the heat storage process, the electric heating device in the thermochemical reactor is started to decompose the heat storage medium and generate water vapor. The second water pump is started to use the feed water to eject the water vapor in the thermochemical reactor. The mixed steam enters the water storage tank to heat the feed water. The first water pump is started, the first regulating valve is opened, the switch valve is closed, and the hot water enters the heat exchanger for heat exchange and cooling. The cooled feed water is returned to the water storage tank. By adjusting the feed water flow of the first water pump and the power of the electric heater, the temperature of the hot water entering the heat exchanger inlet is stabilized and the heat exchange power is continuously adjusted.

[0016] During the heat release process, the first water pump is started, the first regulating valve and the second regulating valve are opened, the electric heater is started, and part of the feed water enters the electric heater to generate reaction steam. The reaction steam enters the tube side of the thermochemical reactor to undergo an exothermic reaction. The other part of the feed water passes through the second regulating valve and enters the tube side of the thermochemical reactor to be heated. The heated feed water enters the heat exchanger. The temperature stability of the hot working medium entering the heat exchanger is achieved by regulating the flow rate of hot and cold feed water by adjusting the opening of the first regulating valve and the second regulating valve.

[0017] A further improvement of the dual-pump thermochemical energy storage heating method of the present invention is:

[0018] Furthermore, it also includes a controller, which is connected to the electric heating device, the first water pump, the first regulating valve, the second water pump, the second regulating valve, the electric heater and the switch valve.

[0019] The present invention has the following beneficial effects:

[0020] In the specific operation of the dual-pump thermochemical energy storage heating system and method described in the present invention, during the heat storage process, the water supply flow rate of the first water pump and the power of the electric heater are adjusted to stabilize the temperature of the hot water entering the heat exchanger inlet and the heat exchange power is continuously adjusted; during the heat release process, the temperature stability of the hot working medium entering the heat exchanger is achieved by regulating the opening of the first regulating valve and the second regulating valve to control the hot and cold water supply flow rates. The operation is simple, convenient and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 It is a structural diagram of the present invention.

[0023] Among them, 1 is a water storage tank, 2 is the first water pump, 3 is the first regulating valve, 4 is a heat exchanger, 5 is a thermochemical reactor, 6 is the second water pump, 7 is an ejector, 8 is the second regulating valve, 9 is an electric heater, and 10 is a switch valve. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Example 1

[0033] refer to Figure 1This embodiment discloses a dual-pump thermochemical energy storage and heating system, including a water storage tank 1, an electric heater 9, a thermochemical reactor 5, a heat exchanger 4, a second water pump 6 and an ejector 7; the outlet of the water storage tank 1 is divided into three routes, wherein the first route is connected to the shell side inlet of the thermochemical reactor 5 through the electric heater 9, the second route is connected to the tube side inlet of the thermochemical reactor 5, the tube side outlet of the thermochemical reactor 5 is connected to the inlet of the heat exchanger 4, the third route is connected to the inlet of the heat exchanger 4, the outlet of the heat exchanger 4 is connected to the inlet of the water storage tank 1, the outlet of the water storage tank 1 is connected to the inlet of the ejector 7 through the second water pump 6, the shell side outlet of the thermochemical reactor 5 is connected to the inlet of the ejector 7, and the outlet of the ejector 7 is connected to the inlet of the water storage tank 1.

[0034] Example 2

[0035] refer to Figure 1 The dual-pump thermochemical energy storage and heating system of the present invention includes a water storage tank 1, a first water pump 2, a first regulating valve 3, a heat exchanger 4, a thermochemical reactor 5, a second water pump 6, an ejector 7, a second regulating valve 8, an electric heater 9 and a switch valve 10;

[0036] The outlet of the water storage tank 1 is divided into three routes, wherein the first route is connected to the shell side inlet of the thermochemical reactor 5 through the electric heater 9, the second route is connected to the tube side inlet of the thermochemical reactor 5, the tube side outlet of the thermochemical reactor 5 is connected to the inlet of the heat exchanger 4, the third route is connected to the inlet of the heat exchanger 4, the outlet of the heat exchanger 4 is connected to the inlet of the water storage tank 1, the outlet of the water storage tank 1 is connected to the inlet of the ejector 7 through the second water pump 6, the shell side outlet of the thermochemical reactor 5 is connected to the inlet of the ejector 7, and the outlet of the ejector 7 is connected to the inlet of the water storage tank 1.

[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 regulating valve 8 is provided on the second path.

[0039] As an embodiment of the present invention, a switch valve 10 is provided at the tube-side outlet of the thermochemical reactor 5 .

[0040] As an embodiment of the present invention, the reaction medium in the thermochemical reactor 5 is a hydroxide system.

[0041] As an embodiment of the present invention, an electric heating device is provided in the thermochemical reactor 5 .

[0042] As an embodiment of the present invention, a heat storage material is arranged on the outer side of the tube side of the thermochemical reactor 5 .

[0043] As an implementation of the present invention, this embodiment further includes a controller, which is connected to the electric heating device, the first water pump 2, the first regulating valve 3, the second water pump 6, the second regulating valve 8, the electric heater 9 and the switch valve 10.

[0044] Example 3

[0045] refer to Figure 1 This embodiment discloses a dual-pump thermochemical energy storage and heating method, which is implemented based on the dual-pump thermochemical energy storage and heating system. The dual-pump thermochemical energy storage and heating system includes a water storage tank 1, an electric heater 9, a thermochemical reactor 5, a heat exchanger 4, a second water pump 6, and an ejector 7. The outlet of the water storage tank 1 is divided into three routes, wherein the first route is connected to the shell side inlet of the thermochemical reactor 5 through the electric heater 9, the second route is connected to the tube side inlet of the thermochemical reactor 5, and the tube side outlet of the thermochemical reactor 5 is connected to the heat exchanger 4. The inlet of the thermochemical reactor 5 is connected, the third road is connected with the inlet of the heat exchanger 4, the outlet of the heat exchanger 4 is connected with the inlet of the water tank 1, the outlet of the water tank 1 is connected with the inlet of the ejector 7 via the second water pump 6, the shell side outlet of the thermochemical reactor 5 is connected with the inlet of the ejector 7, and the outlet of the ejector 7 is connected with the inlet of the water tank 1; the third road is provided with a first regulating valve 3; the second road is provided with a second regulating valve 8; the tube side outlet of the thermochemical reactor 5 is provided with a switch valve 10; the thermochemical reactor 5 is provided with an electric heating device.

[0046] Specifically, the dual-pump thermochemical energy storage heating method includes the following steps:

[0047] During the heat storage process, the electric heating device in the thermochemical reactor 5 is started to decompose the heat storage medium and generate water vapor. The second water pump 6 is started and the water vapor in the thermochemical reactor 5 is ejected by the feed water. The mixed steam enters the water storage tank 1 to heat the feed water. When the temperature Tw of the water storage tank is higher than the set value T1, the first water pump 2 is started, the first regulating valve 3 is opened, the switch valve 10 is closed, and the hot water enters the heat exchanger 4 for heat exchange and cooling. The cooled feed water returns to the water storage tank 1. The feed water flow rate f of the first water pump 2 and the power W1 of the electric heater 9 are adjusted, where W1 / f=aΔT, where a is the heat capacity of water and ΔT is the temperature difference between the inlet and outlet of the feed water in the heat exchanger 4. At this time, the temperature of the hot water entering the inlet of the heat exchanger 4 can be stabilized and the heat exchange power can be continuously adjusted.

[0048] During the heat release process, the electric heating device in the thermochemical reactor 5 is turned off, the first water pump 2 is started, the first regulating valve 3 and the second regulating valve 8 are opened, and the electric heater 9 is started. Part of the feed water enters the electric heater 9 to generate reaction steam, and the reaction steam enters the tube side of the thermochemical reactor 5 to undergo an exothermic reaction. The other part of the feed water enters the tube side of the thermochemical reactor 5 through the second regulating valve 8 and is heated. The heated feed water enters the heat exchanger 4. The temperature stability of the hot working medium entering the heat exchanger 4 is 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 second regulating valve 8, that is, the hot water power W2 of the heat exchanger 4 = k1q1 + k2q2, where q1 = afTw + afTr, and Tr is the hot water temperature at the outlet of the thermochemical reactor.

[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 is a closed cycle and can be processed into a mobile heat source vehicle in a skid-mounted form.

[0052] 3) The present invention achieves stable hot water temperature at the inlet of heat exchanger 4 and continuous regulation of heat exchange power through the designed two pumps and flow network, meeting the requirements of scenarios requiring stable hot water temperature.

[0053] Example 4

[0054] A computer device comprises 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 dual-pump thermochemical energy storage heating method are implemented, including: during the heat storage process, stabilizing the hot water temperature entering the heat exchanger 4 and continuously adjusting the heat exchange power by adjusting the water flow rate of the first water pump 2 and the power of the electric heater 9; during the heat release process, stabilizing the temperature of the hot working medium entering the heat exchanger 4 by regulating the hot and cold water flow rates by adjusting the openings of the first regulating valve 3 and the second regulating valve 8. The memory may include internal memory, such as high-speed random access memory, or may also include 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, or the like. The bus may be classified as an address bus, a data bus, a control bus, or the like. The memory is used to store programs. Specifically, the programs may include program code, which includes computer operating instructions. The memory may include internal memory and non-volatile memory, and provides instructions and data to the processor.

[0055] Example 5

[0056] A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the dual-pump thermochemical energy storage heating method, including: during the heat storage process, stabilizing the hot water temperature at the inlet of the heat exchanger 4 and continuously adjusting the heat exchange power by adjusting the water flow rate of the first water pump 2 and the power of the electric heater 9; during the heat release process, stabilizing the temperature of the hot working medium entering the heat exchanger 4 by regulating the hot and cold water flow rates by adjusting the opening of the first regulating valve 3 and the second regulating valve 8. 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 dual-pump thermochemical energy storage heating system, characterized in that: It comprises a water storage tank (1), an electric heater (9), a thermochemical reactor (5), a heat exchanger (4), a second water pump (6) and an ejector (7); The outlet of the water storage tank (1) is divided into three routes, wherein the first route is connected to the shell side inlet of the thermochemical reactor (5) via the electric heater (9), the second route is connected to the tube side inlet of the thermochemical reactor (5), the tube side outlet of the thermochemical reactor (5) is connected to the inlet of the heat exchanger (4), the third route is connected to the inlet of the heat exchanger (4), the outlet of the heat exchanger (4) is connected to the inlet of the water storage tank (1), the outlet of the water storage tank (1) is connected to the inlet of the ejector (7) via the second water pump (6), the shell side outlet of the thermochemical reactor (5) is connected to the inlet of the ejector (7), and the outlet of the ejector (7) is connected to the inlet of the water storage tank (1).

2. The dual-pump thermochemical energy storage heating system according to claim 1, characterized in that: A first regulating valve (3) is provided on the third path.

3. The dual-pump thermochemical energy storage heating system according to claim 2, characterized in that: A second regulating valve (8) is provided on the second path.

4. The dual-pump thermochemical energy storage heating system according to claim 3, characterized in that: A switch valve (10) is provided at the tube side outlet of the thermochemical reactor (5).

5. The dual-pump thermochemical energy storage heating system according to claim 1, characterized in that: The reaction medium in the thermochemical reactor (5) is a hydroxide system.

6. The dual-pump thermochemical energy storage heating system according to claim 4, characterized in that: The thermochemical reactor (5) is provided with an electric heating device.

7. The dual-pump thermochemical energy storage heating system according to claim 1, characterized in that: Heat storage material is arranged on the outer side of the tube in the thermochemical reactor (5).

8. The dual-pump thermochemical energy storage heating system according to claim 1, characterized in that: It also includes a controller connected to the electric heating device, the first water pump (2), the first regulating valve (3), the second water pump (6), the second regulating valve (8), the electric heater (9) and the switch valve (10).

9. A dual-pump thermochemical energy storage heating method, characterized in that: The dual-pump thermochemical energy storage heating system according to claim 6 comprises the following steps: During the heat storage process, the electric heating device in the thermochemical reactor (5) is started to decompose the heat storage medium and generate water vapor. The second water pump (6) is started to use the feed water to eject the water vapor in the thermochemical reactor (5). The mixed steam enters the water storage tank (1) to heat the feed water. The first water pump (2) is started, the first regulating valve (3) is opened, the switch valve (10) is closed, and the hot water enters the heat exchanger (4) for heat exchange and cooling. The cooled feed water returns to the water storage tank (1). By adjusting the feed water flow of the first water pump (2) and the power of the electric heater (9), the temperature of the hot water entering the heat exchanger (4) is stabilized and the heat exchange power is continuously adjusted. During the heat release process, the first water pump (2) is started, the first regulating valve (3) and the second regulating valve (8) are opened, and the electric heater (9) is started. Part of the feed water enters the electric heater (9) to generate reaction steam, and the reaction steam enters the tube side of the thermochemical reactor (5) to generate an exothermic reaction. Another part of the feed water passes through the second regulating valve (8) and enters the tube side of the thermochemical reactor (5) to be heated. The heated feed water enters the heat exchanger (4). The temperature stability of the hot working medium entering the heat exchanger (4) is achieved by regulating the opening of the first regulating valve (3) and the second regulating valve (8) to control the flow rate of hot and cold feed water.

10. The dual-pump thermochemical energy storage heating method according to claim 9, characterized in that: It also includes a controller connected to the electric heating device, the first water pump (2), the first regulating valve (3), the second water pump (6), the second regulating valve (8), the electric heater (9) and the switch valve (10).

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