Heat storage system

Abstract

The utility model discloses a kind of heat storage systems, the heat storage system, comprising: heat exchange loop;Multiple heat storage pools, multiple the heat storage pool is in parallel distribution in the heat exchange loop;First heat exchanger and second heat exchanger, the first heat exchanger is used to heat exchange with heat source loop, the second heat exchanger is used to heat exchange with user end loop;Wherein, multiple the heat storage pool in any one of it is adapted to with the first heat exchanger selectively series in the heat exchange loop, and multiple the heat storage pool in any one of it is adapted to with the second heat exchanger selectively series in the heat exchange loop.The heat storage system of the utility model embodiment can realize the heat storage and heat supply function of heat storage system, waste heat is recycled and utilized, and multiple heat storage pools are in parallel distribution in heat exchange loop, high and low temperature water can be avoided mixing, and it is beneficial to improve the efficiency of heat storage system.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a heat storage system. Background Technology

[0002] Currently, cross-seasonal heat storage methods include water-based heat storage. Water-based heat storage involves installing water distributors and water extractors at the bottom and top of the hot water storage tank, respectively, to achieve heat storage by utilizing the natural temperature stratification of the water. However, during the heat storage and release process, high and low temperature water can easily mix, reducing system efficiency and leaving room for improvement. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a thermal storage system that can realize both thermal storage and heating functions, recover and utilize waste heat, and avoid the mixing of high and low temperature water, thereby improving the efficiency of the thermal storage system.

[0004] A heat storage system according to an embodiment of the present invention includes: a heat exchange circuit; multiple hot water storage tanks, wherein the multiple hot water storage tanks are distributed in parallel in the heat exchange circuit; a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is used for heat exchange with a heat source circuit, and the second heat exchanger is used for heat exchange with a user-end circuit; wherein any one of the multiple hot water storage tanks is adapted to be selectively connected in series with the first heat exchanger in the heat exchange circuit, and any one of the multiple hot water storage tanks is adapted to be selectively connected in series with the second heat exchanger in the heat exchange circuit.

[0005] According to the embodiment of the present invention, the heat storage system selectively connects any one of multiple hot water storage tanks in series with a first heat exchanger in a heat exchange circuit. This allows water in the hot water storage tank to flow along the heat exchange circuit to the first heat exchanger to exchange heat with the heat source, thus recovering and storing waste heat. Alternatively, any one of the multiple hot water storage tanks can be selectively connected in series with a second heat exchanger in a heat exchange circuit. This allows water in the hot water storage tank to flow along the heat exchange circuit to the second heat exchanger to exchange heat with the user end, thus releasing the absorbed heat to the user end. This achieves the heat storage and heating functions of the heat storage system, recovers and utilizes waste heat, and avoids the mixing of high and low temperature water by distributing multiple hot water storage tanks in parallel in the heat exchange circuit, thereby improving the efficiency of the heat storage system.

[0006] According to some embodiments of the present invention, in a heat storage system, at least one of the plurality of hot water storage tanks is in an empty state and at least one is in a full state, and the water in the full hot water storage tank is adapted to flow to the empty hot water storage tank after passing through the first heat exchanger or the second heat exchanger.

[0007] According to some embodiments of the present invention, in the heat storage system, among the plurality of hot water storage tanks, the number of hot water storage tanks in an empty state is n1, and the number of hot water storage tanks in a full state is n2, and satisfies: n1≥1, n2≥2.

[0008] According to some embodiments of the present invention, each of the hot water storage tanks is provided with an inlet and an outlet, the inlet and the outlet being used to connect the hot water storage tanks to the heat exchange circuit respectively.

[0009] According to some embodiments of the present invention, the heat storage system includes an inlet valve at the inlet, which is adapted to selectively connect the hot water storage tank to the heat exchange circuit via the inlet valve; and an outlet valve at the outlet, which is adapted to selectively connect the hot water storage tank to the heat exchange circuit via the outlet valve.

[0010] The heat storage system according to some embodiments of the present invention further includes a supplementary heat source, which is distributed in parallel with the first heat exchanger in the heat exchange circuit; wherein, the heat exchange circuit is further provided with a first circulating pump distributed in series with the supplementary heat source, and / or the heat exchange circuit is further provided with a second circulating pump distributed in series with the first heat exchanger.

[0011] According to some embodiments of the present invention, the heat storage system further includes a third circulating pump in the heat exchange circuit, which is connected in series with the second heat exchanger in the heat exchange circuit.

[0012] According to some embodiments of the present invention, the supplementary heat source in the heat storage system is an electric boiler.

[0013] According to some embodiments of the present invention, the heat storage system has a first heat exchanger first flow path and a first heat exchanger second flow path. The first heat exchanger first flow path is adapted to selectively connect with any one of the plurality of heat storage tanks, and the first heat exchanger second flow path is adapted to be connected in series in a heat source circuit.

[0014] According to some embodiments of the present invention, the heat storage system includes a second heat exchanger having a first flow path and a second flow path. The first flow path is adapted to be selectively connected to any one of the plurality of hot water storage tanks, and the second flow path is adapted to be connected in series in a user-end circuit.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 The principle of the heat storage system according to the embodiments of this utility model. Figure 1 ;

[0018] Figure 2 The principle of the heat storage system according to the embodiments of this utility model. Figure 2 ;

[0019] Figure 3 The principle of the heat storage system according to the embodiments of this utility model. Figure 3 .

[0020] Figure label:

[0021] Thermal storage system 100,

[0022] Heat exchange circuit 1, first circulation pump 11, second circulation pump 12, third circulation pump 13,

[0023] Hot water storage tank 2, inlet 21, inlet valve 211, outlet 22, outlet valve 221, first hot water storage tank 23, second hot water storage tank 24, third hot water storage tank 25.

[0024] First heat exchanger 3, first flow path 31 of the first heat exchanger, second flow path 32 of the first heat exchanger

[0025] Second heat exchanger 4, first flow path 41 of the second heat exchanger, second flow path 42 of the second heat exchanger

[0026] Heat source circuit 5, user-end circuit 6, supplementary heat source 7, control valve 71.

[0027] Heating turbine 101, steam-water heat exchanger 102, absorption heat pump 103, condenser 104, fourth circulation pump 105, fifth circulation pump 106. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0031] The following is for reference. Figures 1-3 The thermal storage system 100 according to the present invention can realize the functions of thermal storage and heating, recover and utilize waste heat, and avoid mixing of high and low temperature water, which is conducive to improving the efficiency of the thermal storage system 100.

[0032] like Figures 1-3 As shown, a heat storage system 100 according to an embodiment of the present invention includes: a heat exchange circuit 1, multiple hot water storage tanks 2, a first heat exchanger 3, and a second heat exchanger 4.

[0033] Multiple hot water storage tanks 2 are connected in parallel in the heat exchange circuit 1; the first heat exchanger 3 is used to exchange heat with the heat source circuit 5, and the second heat exchanger 4 is used to exchange heat with the user-end circuit 6; wherein, any one of the multiple hot water storage tanks 2 is adapted to be selectively connected in series with the first heat exchanger 3 in the heat exchange circuit 1, and any one of the multiple hot water storage tanks 2 is adapted to be selectively connected in series with the second heat exchanger 4 in the heat exchange circuit 1.

[0034] Specifically, the hot water storage tank 2 has a large volume and can be used to store a large amount of water. The water in the hot water storage tank 2 can be used to exchange heat with the heat source, absorb heat from the heat source and store it, or exchange heat with the user end and release the stored heat to the user end, so as to realize the heat storage and heating functions of the heat storage system 100. Moreover, there are multiple hot water storage tanks 2, that is, the number of hot water storage tanks 2 can be two, three or more. In this way, the heat storage capacity of the heat storage system 100 can be increased by storing heat together through multiple hot water storage tanks 2. Furthermore, by distributing multiple hot water storage tanks 2 in parallel in the heat exchange loop 1, the water in each hot water storage tank 2 can flow along the heat exchange loop 1 to exchange heat with the heat source, absorb heat from the heat source and store it, or the water in each hot water storage tank 2 can flow along the heat exchange loop 1 to exchange heat with the user end and release the absorbed heat to the user end, which can improve the reliability of heat absorption and release.

[0035] Furthermore, each hot water storage tank 2 can be used independently for heat absorption or heat release, which can avoid interference between multiple hot water storage tanks 2 and the mixing of high and low temperature water, thus improving the efficiency of the heat storage system 100 and reducing the need for water distributors and water extractors, thereby reducing the installation cost of the heat storage system 100.

[0036] Furthermore, by selectively connecting any one of the multiple hot water storage tanks 2 in series with the first heat exchanger 3 in the heat exchange circuit 1, the first heat exchanger 3 can be connected in the heat exchange circuit 1. The first heat exchanger 3 can be selectively connected in series with any one of the multiple hot water storage tanks 2, so that the water in the hot water storage tank 2 connected in series with the first heat exchanger 3 can flow along the heat exchange circuit 1 to the first heat exchanger 3. The first heat exchanger 3 is used to exchange heat with the heat source circuit 5, that is, the first heat exchanger 3 is also connected to the heat source circuit 5. Thus, the water in the hot water storage tank 2 flowing to the first heat exchanger 3 can exchange heat with the heat source at this point, absorb the heat from the heat source and store it, so as to realize the heat storage function of the heat storage system 100.

[0037] Furthermore, any one of the multiple hot water storage tanks 2 can be selectively connected in series with the second heat exchanger 4 in the heat exchange loop 1. This allows the second heat exchanger 4 to be connected in the heat exchange loop 1 and selectively connected in series with any one of the multiple hot water storage tanks 2. Water in the hot water storage tank 2 connected in series with the second heat exchanger 4 can flow along the heat exchange loop 1 to the second heat exchanger 4. The second heat exchanger 4 is used to exchange heat with the user-end loop 6, meaning the second heat exchanger 4 is also connected to the user-end loop 6. This allows the water in the hot water storage tank 2 flowing to the second heat exchanger 4 to exchange heat with the user at this point, releasing the absorbed heat to the user to achieve the heating function of the heat storage system 100.

[0038] It should be noted that the heat source in this application can be waste heat from power plants, industrial systems, or solar energy systems, etc. The following description will take waste heat from power plant systems as an example. The user end can be a winter heating system in northern China, and the first heat exchanger 3 can be a plate heat exchanger. Plate heat exchangers are highly flexible, easy to maintain, have a wide range of applications, and have low operating costs. The second heat exchanger 4 can be a large temperature difference heat exchanger. Large temperature difference heat exchangers are energy-saving and environmentally friendly. They can significantly reduce the return water temperature while ensuring that the supply water temperature remains unchanged, which can increase the heat transfer by more than 60% and improve the overall energy efficiency by more than 35%. Therefore, the waste heat can be used for winter heating in northern China, which can realize the recovery and utilization of waste heat, reduce heating costs and installation costs, and improve the efficiency of the heat storage system 100%.

[0039] According to the embodiment of the present invention, the heat storage system 100 selectively connects any one of the multiple hot water storage tanks 2 in series with the first heat exchanger 3 in the heat exchange circuit 1, allowing the water in the hot water storage tank 2 to flow along the heat exchange circuit 1 to the first heat exchanger 3 to exchange heat with the heat source, thus recovering and storing waste heat. Alternatively, any one of the multiple hot water storage tanks 2 can be selectively connected in series with the second heat exchanger 4 in the heat exchange circuit 1, allowing the water in the hot water storage tank 2 to flow along the heat exchange circuit 1 to the second heat exchanger 4 to exchange heat with the user end, thus releasing the absorbed heat to the user end. This achieves the heat storage and heating functions of the heat storage system 100, recovers and utilizes waste heat, and the parallel distribution of the multiple hot water storage tanks 2 in the heat exchange circuit 1 avoids the mixing of high and low temperature water, improving the efficiency of the heat storage system 100.

[0040] In some embodiments, at least one of the plurality of hot water storage tanks 2 is in an empty state and at least one is in a full state, and the water in the hot water storage tank 2 in the full state is adapted to flow to the hot water storage tank 2 in the empty state after passing through the first heat exchanger 3 or the second heat exchanger 4.

[0041] Specifically, the water in the hot water storage tank 2 can flow along the heat exchange loop 1 to the first heat exchanger 3 to exchange heat with the heat source, or flow to the second heat exchanger 4 to exchange heat with the user end, so that at least one of the multiple hot water storage tanks 2 is in an empty state and at least one is in a full state. This ensures that the number of hot water storage tanks 2 in both empty and full states is at least one, which can be one, two, or three, etc., thus ensuring that there is always a hot water storage tank 2 in an empty state and a full state. This allows the water in the full hot water storage tank 2 to flow through the first heat exchanger 3 or the second heat exchanger 4 to the empty hot water storage tank 2.

[0042] In other words, water in the full-water hot water storage tank 2 can flow to the first heat exchanger 3, absorb heat at the first heat exchanger 3, and then enter the empty hot water storage tank 2. This process can achieve the storage of waste heat. Alternatively, water in the full-water hot water storage tank 2 can flow to the second heat exchanger 4, release heat at the second heat exchanger 4, and then enter the empty hot water storage tank 2. This process can achieve the release of heat. Thus, the heat storage system 100 can realize the functions of heat storage and heat supply, and can avoid the formation of a temperature gradient, effectively avoid the mixing of high and low temperature water, and improve the efficiency of the heat storage system 100. Moreover, the height of the hot water storage tank 2 is not limited, which can reduce the installation cost of the hot water storage tank 2.

[0043] In some embodiments, among the plurality of hot water storage tanks 2, the number of hot water storage tanks 2 in an empty state is n1, and the number of hot water storage tanks 2 in a full state is n2, and satisfies: n1≥1, n2≥2.

[0044] Specifically, the number of hot water storage tanks 2 in both the vacant and full states is at least one. The number of vacant hot water storage tanks 2 can be set to n1, where n1≥1. This allows for one, two, or three vacant hot water storage tanks 2 among multiple hot water storage tanks 2, ensuring that there is always a vacant hot water storage tank 2 to hold the water after heat exchange, thus improving the reliability of the heat storage system 100. Simultaneously, the number of full hot water storage tanks 2 can be set to n2, where n2≥2. This allows for two, three, or four full hot water storage tanks 2 among multiple hot water storage tanks 2, ensuring that there is always a full hot water storage tank 2 to hold the water before heat exchange, thus improving the reliability of the heat storage system 100. Furthermore, having at least two full hot water storage tanks 2 increases the number of full hot water storage tanks 2, thereby improving the heat storage capacity and efficiency of the heat storage system 100.

[0045] For example, such as Figures 1-3 As shown, there is one empty hot water storage tank 2 and two full hot water storage tanks 2. This ensures that there is always an empty hot water storage tank 2 to hold the water after heat exchange, and that there is always a full hot water storage tank 2 to hold the water before heat exchange. This improves the reliability of the heat storage system 100 and increases the heat storage capacity of the heat storage system 100. It should be noted that the number of empty hot water storage tanks 2 and the number of full hot water storage tanks 2 are not limited to those described in this embodiment and can be flexibly set according to specific circumstances.

[0046] In some embodiments, each hot water storage tank 2 is provided with an inlet 21 and an outlet 22, which are used to connect the hot water storage tank 2 to the heat exchange circuit 1 respectively.

[0047] Specifically, each hot water storage tank 2 is equipped with an inlet 21 and an outlet 22, both of which are connected to the outside. The inlet 21 and outlet 22 are used to connect the hot water storage tank 2 to the heat exchange circuit 1, respectively. When the outlet 22 is connected to the heat exchange circuit 1, water from the hot water storage tank 2 enters the heat exchange circuit 1 through the outlet 22 and flows along the heat exchange circuit 1 towards… The first heat exchanger 3 or the second heat exchanger 4 absorbs or releases heat. When the inlet 21 is connected to the hot water storage tank 2, the high-temperature water or low-temperature water that has absorbed or released heat at the first heat exchanger 3 or the second heat exchanger 4 can flow along the heat exchange circuit 1 to the hot water storage tank 2 and enter the hot water storage tank 2 through the inlet 21. Thus, the storage or release of heat can be realized, thereby realizing the heat storage or heating function of the heat storage system 100.

[0048] It should be noted that the inlet 21 and outlet 22 of each hot water storage tank 2 are not simultaneously connected to the heat exchange circuit 1, so as to prevent the water flowing out of the hot water storage tank 2 from flowing back to the hot water storage tank 2 along the heat exchange circuit 1, thereby avoiding the mixing of high and low temperature water and improving the efficiency of the heat storage system 100.

[0049] In some embodiments, an inlet valve 211 is provided at the inlet 21, and the inlet 21 is adapted to selectively connect the hot water storage tank 2 to the heat exchange circuit 1 through the inlet valve 211; an outlet valve 221 is provided at the outlet 22, and the outlet 22 is adapted to selectively connect the hot water storage tank 2 to the heat exchange circuit 1 through the outlet valve 221.

[0050] Specifically, the hot water storage tank 2 can be connected to the heat exchange circuit 1 through the inlet 21. An inlet valve 211 is provided at the inlet 21. The inlet valve 211 can be opened or closed so that the inlet 21 can selectively connect the hot water storage tank 2 to the heat exchange circuit 1. That is, the inlet valve 211 can be used to control the connection or disconnection between the inlet 21 and the heat exchange circuit 1. Furthermore, when the inlet valve 211 is open, the inlet 21 is connected to the heat exchange circuit 1, and the water after heat exchange can enter the hot water storage tank 2 through the inlet 21. When the inlet valve 211 is closed, the inlet 21 is disconnected from the heat exchange circuit 1, and the water after heat exchange cannot enter the hot water storage tank 2 through the inlet 21. Thus, the hot water storage tank 2 can be selectively connected to the heat exchange circuit 1 through the inlet valve 211 to avoid the mixing of high and low temperature water.

[0051] Meanwhile, a water outlet valve 221 is provided at the water outlet 22. The water outlet valve 221 can be opened or closed so that the water outlet 22 can selectively connect the hot water storage tank 2 to the heat exchange circuit 1. That is, the water outlet valve 221 can be used to control the connection or disconnection between the water outlet 22 and the heat exchange circuit 1. Furthermore, when the water outlet valve 221 is open, the water outlet 22 is connected to the heat exchange circuit 1, and the water in the hot water storage tank 2 can enter the heat exchange circuit 1 through the water outlet 22 for heat exchange. When the water outlet valve 221 is closed, the water outlet 22 is disconnected from the heat exchange circuit 1, and the water in the hot water storage tank 2 cannot enter the heat exchange circuit 1 through the water outlet 22. Thus, the water outlet valve 221 can selectively connect the hot water storage tank 2 to the heat exchange circuit 1, further avoiding the mixing of high and low temperature water.

[0052] In some embodiments, the thermal storage system 100 further includes a supplementary heat source 7, which is distributed in parallel with the first heat exchanger 3 in the heat exchange circuit 1; wherein the heat exchange circuit 1 is further provided with a first circulating pump 11 distributed in series with the supplementary heat source 7, and / or the heat exchange circuit 1 is further provided with a second circulating pump 12 distributed in series with the first heat exchanger 3.

[0053] Specifically, the thermal storage system 100 can be used to recover and store waste heat for heating in winter. The thermal storage system 100 also includes a supplementary heat source 7, which is used to heat water to supplement the waste heat of the power plant system when it is insufficient, ensuring the reliability of heating using the heat stored in the thermal storage system 100. The supplementary heat source 7 is connected in parallel with the first heat exchanger 3 in the heat exchange loop 1, meaning that both the supplementary heat source 7 and the power plant system can be connected to the heat exchange loop 1 independently. Thus, when storing heat, the power plant system can be connected to the heat exchange loop 1 first for heat storage. When the waste heat of the power plant system is insufficient, the supplementary heat source 7 can be connected to the heat exchange loop 1 to store the waste heat of the power plant system and the heat from the supplementary heat source 7 simultaneously, thereby meeting the heat storage requirements and improving the reliability of the thermal storage system 100.

[0054] The heat exchange circuit 1 is also equipped with a first circulation pump 11 connected in series with the supplementary heat source 7. The first circulation pump 11 is used to overcome the resistance of water flow in the pipe. By connecting the first circulation pump 11 in series with the supplementary heat source 7, it can be ensured that the high-temperature water after heat exchange with the supplementary heat source 7 can smoothly enter the heat exchange circuit 1 and then smoothly enter the hot water storage tank 2 for heat storage. The heat exchange circuit 1 is also equipped with a second circulation pump 12 connected in series with the first heat exchanger 3. The second circulation pump 12 is used to overcome the resistance of water flow in the pipe. By connecting the second circulation pump 12 in series with the first heat exchanger 3, it can be ensured that the high-temperature water after heat exchange with the power plant system can smoothly enter the heat exchange circuit 1 and then smoothly enter the hot water storage tank 2 for heat storage, thereby improving the reliability of the heat storage system 100 for heat storage.

[0055] And, it should be noted that, such as Figures 1-2 As shown, a control valve 71 is provided between the supplementary heat source 7 and the heat exchange circuit 1. The control valve 71 is used to control the on / off connection between the supplementary heat source 7 and the heat exchange circuit 1. When the waste heat of the power plant system is insufficient, the control valve 71 is opened to connect the supplementary heat source 7 and the heat exchange circuit 1, so that the supplementary heat source 7 can be used for heat supplementation. When the waste heat of the power plant system is sufficient, the control valve 71 is closed to disconnect the supplementary heat source 7 from the heat exchange circuit 1 to avoid heat waste.

[0056] In some embodiments, a third circulating pump 13 is further provided in the heat exchange circuit 1, and the third circulating pump 13 is distributed in series with the second heat exchanger 4 in the heat exchange circuit 1.

[0057] Specifically, a third circulation pump 13 is also provided in the heat exchange circuit 1. The third circulation pump 13 is used to overcome the resistance of water flow in the pipe. By setting the third circulation pump 13 in the heat exchange circuit 1, the reliability of water flow in the heat exchange circuit 1 can be ensured. Furthermore, by connecting the third circulation pump 13 in series with the second heat exchanger 4, the high-temperature water in the hot water storage tank 2 can be ensured to smoothly enter the heat exchange circuit 1 and then smoothly flow to the second heat exchanger 4 to exchange heat with the user end, so as to release heat to the user end, thereby improving the reliability of the heat storage system 100 in providing heat.

[0058] And, it should be noted that, in cases such as Figures 1-3 In the embodiment shown, a fourth circulation pump 105 is provided in the heat source circuit 5 to ensure the reliability of water flow in the heat source circuit 5, thereby improving the reliability of heat storage system 100 in heat storage. A fifth circulation pump 106 is provided in the user end circuit 6 to ensure the reliability of water flow in the user end circuit 6, thereby improving the reliability of heat storage system 100 in heat supply.

[0059] In some embodiments, the supplementary heat source 7 is configured as an electric boiler.

[0060] Specifically, the supplementary heat source 7 is used to heat water to supplement the power plant system when the waste heat is insufficient, ensuring the reliability of heating using the heat storage system 100. The supplementary heat source 7 can be constructed as an electric boiler. The electric boiler uses electricity as its energy source, which can reduce the dependence on traditional fossil fuels. It can be turned on or off at any time, which can improve the convenience of use. In addition, the electric boiler has high thermal efficiency and strong adjustability, allowing users to flexibly adjust the power, temperature and running time of the electric boiler according to actual needs, effectively avoiding unnecessary energy waste.

[0061] It should be noted that in actual design, the user end can also be directly heated by the supplementary heat source 7, and the supplementary heat source 7 can also be constructed as a high-temperature air source heat pump or a gas boiler, etc.

[0062] In some embodiments, the first heat exchanger 3 has a first heat exchanger first flow path 31 and a first heat exchanger second flow path 32. The first heat exchanger first flow path 31 is adapted to be selectively connected to any one of the plurality of hot water storage tanks 2, and the first heat exchanger second flow path 32 is adapted to be connected in series in the heat source circuit 5.

[0063] Specifically, the first heat exchanger 3 has a first flow path 31 and a second flow path 32. The water in the first flow path 31 and the second flow path 32 can exchange heat. The first flow path 31 of the first heat exchanger can be selectively connected to any one of the multiple hot water storage tanks 2. That is, one of the hot water storage tanks 2 can be selectively connected to the first flow path 31 of the first heat exchanger through the heat exchange loop 1, so that the water in the hot water storage tank 2 connected to the first flow path 31 can flow along the heat exchange loop 1 to the first flow path 32 of the first heat exchanger. By connecting the power plant system to the second flow path 32 of the first heat exchanger in series with the heat source circuit 5, water carrying the waste heat of the power plant system can flow along the heat source circuit 5 to the second flow path 32 of the first heat exchanger. This allows the water in the hot water storage tank 2 flowing to the first flow path 31 of the first heat exchanger to exchange heat with the water carrying the waste heat of the power plant system flowing to the second flow path 32 of the first heat exchanger, absorbing heat for storage, thus realizing the heat storage function of the heat storage system 100.

[0064] In some embodiments, the second heat exchanger 4 has a first flow path 41 and a second flow path 42. The first flow path 41 is adapted to be selectively connected to any one of the plurality of hot water storage tanks 2, and the second flow path 42 is adapted to be connected in series in the user-end circuit 6.

[0065] Specifically, the second heat exchanger 4 has a first flow path 41 and a second flow path 42. Water in the first flow path 41 and the second flow path 42 can exchange heat. The first flow path 41 can be selectively connected to any one of the multiple hot water storage tanks 2. This means that one of the hot water storage tanks 2 can be selectively connected to the first flow path 41 through a heat exchange loop 1, allowing the high-temperature water in the hot water storage tank 2 connected to the first flow path 41 to flow along the heat exchange loop 1 to the second flow path 42. The first flow path 41 of the two heat exchangers is connected in series with the second flow path 42 of the second heat exchanger in the user-end loop 6. This allows the user end to be connected to the second flow path 42 of the second heat exchanger through the user-end loop 6. This enables the water at the user end to flow along the user-end loop 6 to the second flow path 42 of the second heat exchanger. As a result, the high-temperature water in the hot water storage tank 2 flowing to the first flow path 41 of the second heat exchanger can exchange heat with the water at the user end flowing to the second flow path 42 of the second heat exchanger, releasing the stored heat to the user and thus realizing the heating function of the heat storage system 100.

[0066] And, it should be noted that, such as Figures 1-2 As shown, the two full-water hot water storage tanks 2 are the first hot water storage tank 23 and the second hot water storage tank 24, respectively, and the initial temperature of the water in the first hot water storage tank 23 and the second hot water storage tank 24 is T1. The empty hot water storage tank 2 is the third hot water storage tank 25. The specific process of the heat storage system 100 for heat storage is as follows: the first hot water storage tank 23 is connected to the first heat exchanger 3 through the corresponding outlet valve 221, and the third hot water storage tank 25 is connected to the first heat exchanger 3 through the corresponding inlet valve 211. The remaining inlet valves 211 and outlet valves 221 are closed, so that the water with temperature T1 in the first hot water storage tank 23 can flow to the first heat exchanger 3 to exchange with the heat source. After heat exchange and absorption, the temperature rises to T2 and flows to the third hot water storage tank 25 for storage. When all the water in the first hot water storage tank 23 has flowed out, the first hot water storage tank 23 is empty and the third hot water storage tank 25 is full. If there is still residual heat in the power plant system, the second hot water storage tank 24 can be connected to the first heat exchanger 3 through the corresponding outlet valve 221, and the first hot water storage tank 23 can be connected to the first heat exchanger 3 through the corresponding inlet valve 211. The remaining inlet valves 211 and outlet valves 221 are closed, so that the water in the second hot water storage tank 24 can exchange heat with the heat source at the first heat exchanger 3 and then enter the first hot water storage tank 23, thereby completing the heat storage process.

[0067] When the waste heat of the power plant system is sufficient, the supplementary heat source 7 is closed, the first circulation pump 11 and the control valve 71 are closed. When the waste heat of the power plant system is insufficient, the supplementary heat source 7 is turned on, the first circulation pump 11 and the control valve 71 are turned on, and the water in the hot water storage tank 2 can absorb heat from the supplementary heat source 7 for storage.

[0068] After the heat storage process is completed, the first hot water storage tank 23 and the third hot water storage tank 25 are full of water at a temperature of T2, while the second hot water storage tank 24 is empty. The specific process of the heat storage system 100 supplying heat is as follows: The first hot water storage tank 23 is connected to the second heat exchanger 4 through the corresponding outlet valve 221, and the second hot water storage tank 24 is connected to the second heat exchanger 4 through the corresponding inlet valve 211. The remaining inlet valves 211 and outlet valves 221 are closed, allowing the water at temperature T2 in the first hot water storage tank 23 to flow to the second heat exchanger 4 to exchange heat with the user and release heat. The temperature then drops to T1 and flows to the second hot water storage tank 24. After all the water in the first hot water storage tank 23 has flowed out, the first hot water storage tank 23 is empty and the second hot water storage tank 24 is full. Then, the third hot water storage tank 25 is connected to the second heat exchanger 4 through the corresponding outlet valve 221, and the first hot water storage tank 23 is connected to the second heat exchanger 4 through the corresponding inlet valve 211. The remaining inlet valves 211 and outlet valves 221 are closed, so that the water in the third hot water storage tank 25 can exchange heat with the user end and then enter the first hot water storage tank 23, thereby completing the heating process.

[0069] During the heating season, the power plant system stops storing heat and the supplementary heat source 7 is shut down, which ensures the reliability of the heat storage system 100 in providing heat.

[0070] Moreover, such as Figures 1-2 As shown, the power plant system includes a heating turbine 101, a steam-water heat exchanger 102, an absorption heat pump 103, and a condenser 104. The heating turbine 101 is used to convert steam into exhaust steam. The steam-water heat exchanger 102 and the absorption heat pump 103 are used to allow steam that has not been converted into exhaust steam to exchange heat with water in the heat source circuit 5. The condenser 104 is used to allow exhaust steam to exchange heat with water in the heat source circuit 5, thereby allowing the water in the heat source circuit 5 to absorb heat and release the heat to the water in the hot water storage tank 2 at the first heat exchanger 3 for storage.

[0071] The absorption heat pump 103 includes a generator, a condenser, an evaporator, an absorber, and a solution heat exchanger. Its working principle is as follows: Under negative pressure, the lithium bromide solution is heated by a heat source in the generator, releasing refrigerant vapor and becoming concentrated. The refrigerant vapor carries heat into the condenser, where it is condensed into a liquid state by the hot water in the heat source loop 5, releasing heat as latent heat to the hot water. The hot water is then reheated. The liquid refrigerant flows from the condenser into the evaporator's water pan. Under the action of the refrigerant pump, water drips from the top of the evaporator in a vacuum environment and continuously vaporizes, absorbing heat from the heat source. In loop 5, the heat from the hot water is converted into refrigerant vapor carrying residual heat. This low-pressure refrigerant vapor, formed in the evaporator, enters the absorber via a baffle plate. The lithium bromide solution from the generator drips onto the top of the absorber and continuously absorbs the low-pressure refrigerant vapor, releasing its latent and sensible heat to the hot water in loop 5. This initial heating of the hot water, combined with two heating processes, enhances the heat storage capacity of the heat storage system 100. Furthermore, to optimize temperature distribution, the concentrated and dilute lithium bromide solutions undergo a heat exchange at the solution heat exchanger, improving the overall efficiency. The absorption heat pump 103 can also be an electric heat pump, a water source heat pump, or a ground source heat pump.

[0072] Additionally, an absorption heat pump is installed in user-side loop 6. The absorption heat pump includes an evaporator, absorber, generator, condenser, solution heat exchanger, and plate heat exchanger. Primary network water flowing from the plate heat exchanger enters the evaporator, flows within the evaporator's heat transfer tubes, and exchanges heat with refrigerant water sprayed under vacuum outside the pipes. The refrigerant water absorbs residual heat from the pipes and evaporates, spraying concentrated lithium bromide solution onto the outside of the absorber's heat transfer tubes. This absorbs the refrigerant vapor generated by the evaporator, becoming a dilute solution. The absorbed heat is carried away by secondary network water flowing within the heat transfer tubes, increasing the temperature of the secondary network water. The dilute solution from the absorber is heated and concentrated into a concentrated solution by the primary network water in the generator, simultaneously generating a large amount of refrigerant. Steam enters the condenser, and secondary network water from the absorber enters the condenser's heat transfer tubes. Absorbing the heat from the refrigerant steam outside the tubes, the temperature is raised again before entering the user-end loop 6. The refrigerant steam releases heat and condenses into refrigerant water, which then re-enters the evaporator to absorb heat from the primary network water after heat exchange with the plate heat exchanger. The dilute solution from the absorber and the concentrated solution from the generator exchange heat in a solution heat exchanger to increase the temperature of the solution entering the generator and reduce the generator's high-grade heat energy consumption. The secondary network return water exchanges heat with the primary network water from the generator in a plate heat exchanger. The secondary network supply water, after heat exchange, enters the user-end loop 6, and the primary network water from the plate heat exchanger enters the evaporator to release heat. Furthermore, the absorption heat pump can also be an ammonia-water absorption heat pump.

[0073] The absorption heat pump 103 in the power plant system and the absorption heat pump in the user-end circuit 6 both have a solution pump and a refrigerant pump. The solution pump is used to transport lithium bromide solution, and the refrigerant pump is used to transport refrigerant.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A thermal storage system, characterized in that, include: Heat exchange circuit; Multiple hot water storage tanks are connected in parallel in the heat exchange circuit; A first heat exchanger and a second heat exchanger, wherein the first heat exchanger is used to exchange heat with the heat source circuit and the second heat exchanger is used to exchange heat with the user-end circuit. Among them, any one of the plurality of hot water storage tanks is adapted to be selectively connected in series with the first heat exchanger in the heat exchange circuit, and any one of the plurality of hot water storage tanks is adapted to be selectively connected in series with the second heat exchanger in the heat exchange circuit.

2. The thermal storage system according to claim 1, characterized in that, At least one of the plurality of hot water storage tanks is in an empty state and at least one is in a full state, and the water in the full hot water storage tank is adapted to flow to the empty hot water storage tank after passing through the first heat exchanger or the second heat exchanger.

3. The thermal storage system according to claim 2, characterized in that, Of the multiple hot water storage tanks, n1 is in an empty state and n2 is in a full state, satisfying the following conditions: n1≥1, n2≥2.

4. The thermal storage system according to claim 1, characterized in that, Each of the hot water storage tanks is provided with an inlet and an outlet, which are used to connect the hot water storage tank to the heat exchange circuit respectively.

5. The thermal storage system according to claim 4, characterized in that, The inlet is equipped with an inlet valve, and the inlet is adapted to selectively connect the hot water storage tank to the heat exchange circuit through the inlet valve; A water outlet valve is provided at the water outlet, and the water outlet is adapted to selectively connect the hot water storage tank to the heat exchange circuit through the water outlet valve.

6. The thermal storage system according to claim 1, characterized in that, It also includes a supplementary heat source, which is connected in parallel with the first heat exchanger and distributed in the heat exchange circuit; The heat exchange circuit is further provided with a first circulating pump connected in series with the supplementary heat source, and / or the heat exchange circuit is further provided with a second circulating pump connected in series with the first heat exchanger.

7. The thermal storage system according to claim 6, characterized in that, The heat exchange circuit is also equipped with a third circulating pump, which is connected in series with the second heat exchanger in the heat exchange circuit.

8. The thermal storage system according to claim 6, characterized in that, The supplementary heat source is an electric boiler.

9. The thermal storage system according to claim 1, characterized in that, The first heat exchanger has a first flow path and a second flow path. The first flow path is adapted to be selectively connected to any one of the plurality of hot water storage tanks, and the second flow path is adapted to be connected in series in a heat source circuit.

10. The thermal storage system according to claim 1, characterized in that, The second heat exchanger has a first flow path and a second flow path. The first flow path is adapted to be selectively connected to any one of the plurality of hot water storage tanks, and the second flow path is adapted to be connected in series in the user-end circuit.

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