Heat storage device and heat supply system

Abstract

The invention discloses a heat storage device and a heat supply system, and relates to the technical field of heat supply. The flexible water storage bag is arranged at the bottom and / or the top of the vertical heat storage tank body and is used for storing water; the floating heat insulation plate is horizontally arranged above or below the flexible water storage bags or between the two flexible water storage bags, and the floating heat insulation plate moves in the vertical direction of the vertical heat storage tank body when the water amount of the flexible water storage bags changes. The floating heat insulation plate and the flexible water storage bag are arranged to form a hydraulic piston system, high-temperature water and low-temperature water in the heat storage tank are completely separated in a physical isolation mode, and the defects that a traditional heat storage tank is unstable in thermocline, low in heat charging and discharging speed and difficult to miniaturize are overcome.

Description

Technical Field

[0001] This application relates to the technical field of heating, and in particular to a heat storage device and a heating system. Background Technology

[0002] Against the backdrop of global efforts to address climate change and promote energy structure transformation, the penetration rate of renewable energy sources, such as photovoltaics and wind power, in the power grid is growing at an unprecedented rate. However, the inherent intermittency and volatility of these energy sources pose significant challenges to the stable operation of the power grid, and also lead to dramatic fluctuations in electricity market prices, with the peak-valley price gap widening continuously. Therefore, configuring energy storage devices at the energy consumption end (especially in heating systems) to improve the flexibility of system operation is of vital importance for reducing energy expenditures, enhancing the local consumption capacity of renewable energy, and ensuring energy security.

[0003] In the field of building heating, the current mainstream energy storage technologies and their applications have the following limitations: Electrochemical energy storage (such as lithium batteries): This technology is mainly used for power frequency regulation and peak shaving. If applied to heating, energy needs to undergo multiple conversions of "electrochemical-electricity-heat", resulting in significant energy loss and low overall efficiency. Its initial investment cost is extremely high, and the equipment is idle and cannot function during the non-heating season (which accounts for more than half of the year), which seriously affects its economic viability in heating scenarios.

[0004] Phase change material (PCM) energy storage: This technology offers high energy density, but its initial investment cost is also relatively high. A more critical challenge lies in its compatibility with modern low-temperature heating systems. For example, the highest outlet water temperature of an air source heat pump in winter is typically only 50-55℃. The outlet water temperature of the heat pump dictates that the phase change point of the PCM material cannot exceed this temperature (otherwise, efficient heat storage cannot be achieved using the latent heat of phase change). However, for most buildings in northern regions, the supply water temperature of the heating pipes on the coldest days is often higher than 50℃, meaning the phase change point of the PCM material cannot be lower than this temperature. To achieve "efficient heat exchange," a large temperature difference is required between the PCM material and the heat / cooling medium. However, the aforementioned two factors result in a very small temperature difference between the PCM material and the heat source (possibly only 1-5℃), leading to an extremely slow heat transfer rate. This makes it impossible to complete effective heat storage within a limited timeframe, thus limiting its application value.

[0005] Traditional sensible heat (water) thermal storage systems: This technology is also known as thermocentric water thermal storage systems. Using water as the medium, it is inexpensive, technologically mature, and perfectly compatible with heat sources such as low-temperature heat pumps. Its most common form utilizes the natural density difference of water to form a stable thermocentric layer (hot above, cold below) to achieve single-tank thermal storage. However, thermocentric layers have drawbacks such as instability, slow heat charging and discharging rates, and difficulty in miniaturization. Summary of the Invention

[0006] Therefore, the purpose of this application is to propose a heat storage device and a heating system. By setting up a floating heat insulation plate and a flexible water storage bag, a "hydraulic piston" system is formed. Through physical isolation, the high-temperature water and low-temperature water in the heat storage tank are completely separated, overcoming the shortcomings of traditional heat storage tanks such as unstable inclined temperature layer, slow heat charging and discharging rate, and difficulty in miniaturization.

[0007] This application provides a heat storage device, which includes: a vertical heat storage tank; a flexible water storage bag placed at the bottom and / or top of the vertical heat storage tank for storing water; and a floating heat insulation plate horizontally placed above or below the flexible water storage bag or between two of the flexible water storage bags, wherein the floating heat insulation plate moves vertically along the vertical heat storage tank when the water volume in the flexible water storage bag changes.

[0008] For example, the heat storage device includes a first water outlet / inlet at the bottom and a second water outlet / inlet at the top, and the flexible water storage bag is sealed, with its interior communicating with the first water outlet / inlet and / or the second water outlet / inlet.

[0009] For example, the floating insulation board includes a load-bearing frame, an insulation core material, and a rigid outer shell. The thermal conductivity of the insulation core material is lower than the thermal conductivity threshold, and the overall density of the floating insulation board is greater than the density of water at a preset water temperature.

[0010] For example, the heat storage device further includes a guide rail arranged in the internal vertical direction of the vertical heat storage tank. The guide rail is connected to the floating heat insulation plate through a slider so that the floating heat insulation plate remains horizontal when it moves in the vertical direction.

[0011] For example, the edge of the floating heat insulation plate is provided with a sealing ring, which is in close contact with the inner wall of the vertical heat storage tank to prevent water convection above and below the floating heat insulation plate.

[0012] For example, the heat storage device further includes a position sensor for acquiring the position information of the floating heat insulation plate.

[0013] Another embodiment of this application provides a heating system, which includes: a heat storage device as described above; a heat source module and an energy load module; and a pipeline module connected to the heat storage device, wherein the heat storage device is connected to the main pipeline between the heat source module and the energy load module through the pipeline module.

[0014] For example, the heat storage device includes a first inlet / outlet at the bottom and a second inlet / outlet at the top. The main pipeline includes a main water supply pipeline and a main return water pipeline. The pipeline module includes a first valve, a second valve, a first water pump, and a second water pump. The inlet end of the first water pump is connected to the second inlet / outlet, and the outlet end of the first water pump is connected to the main water supply pipeline. The first valve is located on a branch parallel to the first water pump. The inlet end of the second water pump is connected to the first inlet / outlet, and the outlet end of the second water pump is connected to the main return water pipeline. The second valve is located on a branch parallel to the second water pump.

[0015] For example, when the heating system is in a heat storage state, the first water pump is turned off, the first valve is opened, the second water pump is turned on, and the second valve is closed, so that the hot water from the main water supply pipe enters the heat storage device through the first valve and the second outlet / inlet, and the low-temperature water from the heat storage device enters the main return water pipe through the first outlet / inlet and the second water pump.

[0016] For example, when the heating system is in a heat release state, the first water pump is turned on, the first valve is closed, the second water pump is turned off, and the second valve is turned on, so that the hot water of the heat storage device enters the main water supply pipe through the second outlet / inlet and the first water pump, and the low temperature water of the main return water pipe enters the heat storage device through the second valve and the first outlet / inlet.

[0017] For example, when the heating system is in a non-heat storage state and a non-heat release state, the first water pump is turned off, the first valve is turned off, the second water pump is turned off, and the second valve is turned off.

[0018] In the above embodiments, the heat storage device includes: a vertical heat storage tank; a flexible water storage bladder placed at the bottom and / or top of the vertical heat storage tank for storing water; and a floating insulation plate horizontally positioned above or below the flexible water storage bladder or between two flexible water storage bladders. The floating insulation plate moves vertically along the vertical direction of the vertical heat storage tank as the water volume in the flexible water storage bladder changes. This invention, by setting up a floating insulation plate and flexible water storage bladders, constitutes a "hydraulic piston" system, which completely separates the high-temperature water and low-temperature water in the heat storage tank through physical isolation, overcoming the shortcomings of traditional heat storage tanks such as unstable temperature gradient, slow heat charging and discharging rates, and difficulty in miniaturization. Attached Figure Description

[0019] Figure 1 A temperature diagram of a heat storage tank provided for related technical implementation methods; Figure 2A schematic diagram of the tank temperature when the water filling / draining rate is slow, provided for the implementation of related technologies; Figure 3 A schematic diagram of the tank temperature when the water filling / draining rate is relatively fast, provided for the implementation of related technologies; Figure 4 A schematic diagram of a heat storage device provided for an embodiment of this application; Figure 5 A schematic diagram of a heating system provided for an embodiment of this application. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of the 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 intended to explain this application, and should not be construed as limiting this application.

[0021] Traditional sensible heat (water) thermal storage system: This technology is also known as a thermocline water thermal storage system. Using water as the medium, this technology is low-cost, mature, and perfectly compatible with heat sources such as low-temperature heat pumps. Its most common form utilizes the natural density difference of water to form a stable "thermocline" (hot above, cold below) to achieve single-tank thermal storage. The state of the thermocline thermal storage tank is as follows... Figure 1 As shown, high-temperature water and low-temperature water are stored together, with a thermocline layer existing between them. However, this traditional technology has inherent drawbacks: 1) Conflict between structure and efficiency: To form a stable stratification, traditional thermocline storage tanks typically require a large height-to-diameter ratio, meaning the tank is tall and narrow, which places stringent requirements on installation space. The thermocline itself has a certain thickness (usually 0.5 to 1.0 meters), and this part of the hot and cold mixing zone is an ineffective volume, reducing the effective utilization rate of the storage tank.

[0022] 2) Limited operating rate: Thermoclimate is physically very fragile. When the water filling / draining rate is slow, a relatively stable thermoclimate can be formed, such as... Figure 2 The diagram shows the tank temperature when the filling / draining rate is slow; the redder the color, the higher the temperature. However, when the filling / draining rate is too fast, the thermocline will be disrupted, and the hot and cold water inside the tank will mix, such as... Figure 3 The diagram showing the tank temperature during rapid water filling / draining severely impacts heating quality. To prevent disturbances during filling / draining from disrupting stratification, the flow rate must be strictly controlled. This results in a slow heat storage / release rate, making it difficult to rapidly process energy, thus affecting its ability to participate in rapid grid response and capture short periods of low electricity prices.

[0023] 3) Limited application scale: Due to the inherent minimum thickness of the thermocline, traditional technologies are usually only suitable for large-scale thermal storage systems (tank heights of several meters or even tens of meters). For small-scale heating scenarios with a heating area of ​​only a few hundred or a few thousand square meters, if the tank height is only 1-2 meters, the thermocline will occupy most of the space, rendering it completely unusable.

[0024] Based on this, this application proposes a forced stratified floating piston heat storage device. Its core is a "hydraulic piston" system formed by setting floating heat insulation plates and flexible water storage bags in a heat storage tank. Through physical isolation, the high-temperature water and low-temperature water in the tank are completely separated, which solves the problems of high investment cost, poor technical matching, low operating efficiency, slow charging and discharging rate and limited application scale of existing heat storage technologies in heating applications.

[0025] Figure 4 This is a schematic diagram of a heat storage device according to an embodiment of this application.

[0026] As an example, such as Figure 4 As shown, the heat storage device includes: a vertical heat storage tank 101; a flexible water storage bag 102, which is placed at the bottom and / or top of the vertical heat storage tank 101 for storing water; and a floating heat insulation plate 103, which is horizontally placed above or below the flexible water storage bag 102 or between two flexible water storage bags 102. The floating heat insulation plate 103 moves vertically along the vertical direction of the vertical heat storage tank 101 when the water volume in the flexible water storage bag 102 changes.

[0027] For example, the vertical thermal storage tank 101 can be a steel atmospheric pressure vessel covered with an insulation layer for heat preservation. The vertical thermal storage tank 101 is used to simultaneously store hot water and cryogenic water, the capacities of which can vary according to specific heating demands. For example, when the system needs heat storage, the hot water capacity increases, and the cryogenic water capacity decreases. Conversely, when the system needs heat release, the hot water capacity decreases, and the cryogenic water capacity increases. A flexible water storage bag 102 is used to store cryogenic water and / or hot water. The flexible water storage bag 102 can be made of a highly durable, temperature-sensitive material (such as EPDM rubber). It is understood that the number of flexible water storage bags 102 can be one or two. If there is only one flexible water storage bag 102, it can be located at the bottom of the vertical thermal storage tank 101 for storing cryogenic water. It can also be located at the top of the vertical thermal storage tank 101 for storing hot water. Of course, two flexible water storage bags 102 can also be set, respectively at the bottom and top of the vertical heat storage tank 101, for storing low-temperature water and hot water respectively. Figure 4The example shown is a flexible water storage bag 102 located at the bottom of a vertical heat storage tank 101. Due to water temperature characteristics, the lower area of ​​the heat storage tank is usually designated as the low-temperature zone, and the upper area as the high-temperature zone.

[0028] For example, this application employs a rigid floating heat insulation plate 103 positioned above, below, or between two flexible water storage bags 102. It can be understood that if there is only one flexible water storage bag 102 located at the bottom of the vertical heat storage tank 101, the floating heat insulation plate 103 is positioned above it. If there is only one flexible water storage bag 102 located at the top of the vertical heat storage tank 101, the floating heat insulation plate 103 is positioned below it. If there are two flexible water storage bags 102, the floating heat insulation plate 103 is positioned between them. In other words, the floating heat insulation plate 103 is positioned between the high-temperature zone and the low-temperature zone to physically isolate heat transfer between them. It should be noted that the floating heat insulation plate 103 is placed horizontally inside the vertical heat storage tank 101. When the water volume in the flexible water storage bag 102 changes, the floating heat insulation plate 103 moves along the vertical direction of the vertical heat storage tank 101.

[0029] The thermal storage device of this application physically isolates the high-temperature zone and the low-temperature zone through a floating insulation plate 103, achieving complete separation of heat and cold. The physical isolation by the rigid insulation plate fundamentally eliminates the mixing of high-temperature and low-temperature water, ensuring a constant output water temperature and improving heating quality and heat source operating efficiency. Furthermore, the physical insulation plate compresses the 0.5-1.0 meter thick inclined temperature layer in traditional technologies to almost zero, significantly increasing the energy storage density and volume utilization rate of the storage tank. Due to the extremely stable layered structure, unaffected by flow velocity, the heating system using this thermal storage device allows for charging / releasing heat at much higher flow rates than traditional technologies, enabling more efficient utilization of off-peak electricity periods and possessing the potential to participate in rapid response scenarios such as grid ancillary services.

[0030] The heat storage device of this application is independent of the tank height, allowing the heat storage tank to be designed to be shorter and more compact (e.g., only 1 meter in height). This enables it not only to be used in large-scale centralized heating, but also to be revolutionaryly applied to small heating systems with a heating area of ​​only a few hundred or a few thousand square meters. It can be combined with small heat pumps, photovoltaics, solar thermal and other equipment to form a highly efficient low-carbon / zero-carbon distributed energy system.

[0031] As an example, such as Figure 4 As shown, the heat storage device includes a first outlet / inlet 104 at the bottom and a second outlet / inlet 105 at the top, and a flexible water storage bag 102 is sealed, the interior of which is in communication with the first outlet / inlet 104 and / or the second outlet / inlet 105.

[0032] It is understood that the flexible water storage bag 102 is sealed around the high temperature zone and / or low temperature zone, but the first water outlet / inlet 104 at the bottom and the second water outlet / inlet 105 at the top of the heat storage device can still be connected to the liquid inside the flexible water storage bag 102 through the flexible water storage bag 102 for water inlet or outlet.

[0033] As an example, the floating insulation board 103 includes a load-bearing frame, an insulation core material, and a rigid outer shell. The thermal conductivity of the insulation core material is lower than the thermal conductivity threshold, and the overall density of the floating insulation board 103 is greater than the density of water at a preset water temperature.

[0034] For example, the floating insulation panel 103 is a sandwich composite structure, comprising a load-bearing frame, an insulating core material, and a rigid outer shell. The thermal conductivity of the insulating core material is below a thermal conductivity threshold; the lower the thermal conductivity of the insulating core material, the better the insulation effect. For example, rigid polyurethane or aerogel can be used as the insulating core material with low thermal conductivity. The rigid outer shell can be, for example, made of stainless steel. The overall density of the floating insulation panel is greater than the density of water at a preset water temperature, which can be 4°C. For example, the overall density of the floating insulation panel 103 is designed to be slightly greater than the density of water at 4°C to ensure that it can always stably "lay flat" above the flexible water storage bag 102.

[0035] As an example, the heat storage device also includes a guide rail arranged vertically inside the vertical heat storage tank 101. The guide rail is connected to the floating heat insulation plate 103 by a slider so that the floating heat insulation plate remains horizontal when it moves vertically.

[0036] For example, guide rails can be vertically arranged on the inner wall of the vertical heat storage tank 101. The number of guide rails is not limited. The guide rails are used to assist the vertical movement of 103. Preferably, the number of guide rails can be set to 4, 8, etc., and they are evenly arranged on the inner wall of the vertical heat storage tank 101. The guide rails can be made of stainless steel. The edge of the floating heat insulation plate 103 is equipped with a low-friction slider (such as PTFE), which cooperates with the guide rails to ensure that the floating heat insulation plate 103 remains horizontal and does not jam during vertical movement.

[0037] As an example, the edge of the floating insulation plate 103 is provided with a sealing ring, which is in close contact with the inner wall of the vertical heat storage tank 101 to prevent water convection above and below the floating insulation plate 103.

[0038] For example, multiple sealing rings can be provided on the edge of the floating heat insulation plate 103. The sealing rings can be flexible scraper-type sealing rings, which are closely attached to the inner wall of the vertical heat storage tank 101 when the floating heat insulation plate 103 moves up and down, forming a dynamic seal to prevent water from flowing through the gaps in the wall between the floating heat insulation plate 103 and the water above and below the floating heat insulation plate 103.

[0039] As an example, the heat storage device also includes a position sensor 106, which is used to acquire position information of the floating insulation plate 103.

[0040] For example. As Figure 4 As shown, a position sensor 106 can be installed on the top of the vertical heat storage tank 101. The position sensor 106 can be a non-contact ranging device (such as a laser or ultrasonic level gauge) to monitor the vertical position of the floating insulation plate 103 in real time. Of course, the position of the position sensor 106 is not limited to the top of the vertical heat storage tank 101; it can also be installed at other locations on the vertical heat storage tank 101, as long as it can obtain the position information of the floating insulation plate 103.

[0041] The thermal storage device of this application can achieve accurate thermal storage state (SOC) measurement. By directly measuring the position of the floating insulation plate through a position sensor, the volume of cold / hot water can be accurately determined, realizing real-time and accurate measurement of stored energy and providing a reliable data foundation for upper-level optimization scheduling strategies.

[0042] This application also proposes a heating system.

[0043] As an example, such as Figure 5 As shown, the heating system includes: the aforementioned heat storage device; a heat source module and an energy load module; and a pipeline module connected to the heat storage device. The heat storage device is connected to the main pipeline between the heat source module and the energy load module through the pipeline module.

[0044] For example, a heat storage device is typically installed between a heat source module and an energy load module. The heat source module can be understood as a module that heats water, such as multiple heat pumps. The energy load module can be understood as the object being heated, such as various buildings. The heat storage device is used to store and release heat according to specific circumstances.

[0045] As an example, such as Figure 5 As shown, the heat storage device includes a first outlet / inlet at the bottom and a second outlet / inlet at the top. The main pipeline includes a main water supply pipeline and a main return pipeline. The pipeline module includes a first valve 1', a second valve 2, a first water pump 1, and a second water pump 2'. The inlet end of the first water pump 1 is connected to the second outlet / inlet, and the outlet end of the first water pump 1 is connected to the main water supply pipeline. The first valve 1' is located on a branch parallel to the first water pump 1. The inlet end of the second water pump 2' is connected to the first outlet / inlet, and the outlet end of the second water pump 2' is connected to the main return pipeline. The second valve 2 is located on a branch parallel to the second water pump.

[0046] For example, the heat storage device includes a first inlet / outlet at the bottom and a second inlet / outlet at the top. The inlet and outlet of low-temperature water are used as the first inlet / outlet, and the inlet and outlet of high-temperature water are used as the second inlet / outlet. A first water pump 1 and a first valve 1' are disposed between the second inlet / outlet of the heat storage device and the main water supply pipe, for regulating the hot water in the main water supply pipe and the hot water in the heat storage device. A second water pump 2' and a second valve 2 are disposed between the first inlet / outlet of the heat storage device and the main return water pipe, for regulating the low-temperature water in the main return water pipe and the low-temperature water below the heat storage device.

[0047] As an example, when the heating system is in a heat storage state, the first water pump 1 is closed, the first valve 1' is opened, the second water pump 2' is opened, and the second valve 2 is closed, so that the hot water from the main water supply pipe enters the heat storage device through the first valve 1' and the second outlet / inlet, and the low-temperature water from the heat storage device enters the main return water pipe through the first outlet / inlet and the second water pump 2'.

[0048] For example, the system can perform heat storage operation during off-peak hours when electricity prices are low. At this time, the heating system is in a heat storage state. The first water pump 1 is closed, the first valve 1' is open, the second water pump 2' is open, and the second valve 2 is closed. Low-temperature water flows into the main return water pipe through the second water pump 2'. The heat source module (such as a heat pump) starts, heating the low-temperature water (or system return water) from the heat storage module, and then flows through the main supply water pipe and the first valve 1' into the hot water area above the heat storage device, i.e., into the space above the floating insulation plate. As high-temperature water is continuously injected, the volume of the high-temperature water increases, pushing the floating insulation plate downwards smoothly. Simultaneously, low-temperature water in the flexible water storage bag below is drawn out by the second water pump 2' through the first inlet / outlet and sent back to the heat source module for heating. This process continues until the floating insulation plate moves to the bottom of the tank, completing heat storage.

[0049] As an example, when the heating system is in the heat release state, the first water pump 1 is turned on, the first valve 1' is closed, the second water pump 2' is closed, and the second valve 2 is turned on, so that the hot water of the heat storage device enters the main water supply pipe through the second outlet / inlet and the first water pump 1, and the low temperature water of the main return water pipe enters the heat storage device through the second valve 2 and the first outlet / inlet.

[0050] For example, during peak electricity price periods, the heat source module may be shut down or operating at low load, and the heating system may perform a heat release operation. At this time, the heating system is in a heat release state. The first water pump 1 is opened, the first valve 1' is closed, the second water pump 2' is closed, and the second valve 2 is opened. Low-temperature return water from the main return pipe enters the low-temperature flexible water storage bladder below the heat storage device through the second valve 2 and the first inlet / outlet at the bottom of the tank, causing it to expand. The expansion force of the low-temperature flexible water storage bladder pushes the floating insulation plate upwards smoothly, while simultaneously drawing the high-temperature water above the floating insulation plate out through the second inlet / outlet at the top of the tank by the first water pump 1, into the main water supply pipeline, and sent to the energy load module (e.g., the building) to meet its heating needs. This process continues until the floating insulation plate moves to the top of the tank, completing the heat release.

[0051] As an example, when the heating system is in a non-heat storage and non-heat release state, the first water pump is shut off, the first valve is shut off, the second water pump is shut off, and the second valve is shut off.

[0052] For example, if the system is neither in a heat storage state nor a heat release state, then the first water pump 1 is closed, the first valve 1' is closed, the second water pump 2' is closed, and the second valve 2 is closed. In other words, at this time, the heat storage device is not invoked for auxiliary heating or heat storage, and the heat pump module is used to directly heat the energy load module.

[0053] The heating system proposed in this application eliminates the height of the heat storage tank as a key factor limiting its performance. For a heat storage requirement with a total volume of 18.84 m³, traditional technology might require a tank with a diameter of 2 meters and a height of about 6 meters, while this application can use a tank with a diameter of 3.5 meters and a height of only 2 meters, greatly reducing the height requirements for installation space. This allows it to be easily installed in the basement, equipment floor, or podium of a building, laying the foundation for the widespread application of miniaturized, distributed low-carbon / zero-carbon heating systems (such as a "photovoltaic / heat pump + heat storage" system serving an office building or a small community).

[0054] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this application, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0055] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0056] In the description of this application, the references to terms such as "one embodiment," "some embodiments," "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 this application. In this application, 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.

[0057] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0058] Furthermore, the terms "first," "second," etc., used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this application can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this application, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly and specifically defined in the embodiments.

[0059] In this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0060] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A heat storage device, characterized in that, The heat storage device includes: Vertical thermal storage tank; A flexible water storage bag is placed at the bottom and / or top of the vertical heat storage tank for storing water; A floating heat insulation plate is horizontally positioned above or below the flexible water storage bladder or between two of the flexible water storage bladders. The floating heat insulation plate moves vertically along the vertical heat storage tank when the water volume in the flexible water storage bladder changes.

2. The heat storage device according to claim 1, characterized in that, The heat storage device includes a first water outlet / inlet at the bottom and a second water outlet / inlet at the top. The flexible water storage bag is sealed, and its interior is connected to the first water outlet / inlet and / or the second water outlet / inlet.

3. The heat storage device according to claim 1, characterized in that, The floating insulation board includes a load-bearing frame, an insulation core material, and a rigid outer shell. The thermal conductivity of the insulation core material is lower than the thermal conductivity threshold, and the overall density of the floating insulation board is greater than the density of water at a preset water temperature.

4. The heat storage device according to claim 1, characterized in that, The heat storage device also includes a guide rail arranged vertically inside the vertical heat storage tank. The guide rail is connected to the floating heat insulation plate via a slider so that the floating heat insulation plate remains horizontal when it moves vertically.

5. The heat storage device according to claim 1, characterized in that, The floating heat insulation plate is provided with a sealing ring at its edge, and the sealing ring is in close contact with the inner wall of the vertical heat storage tank to prevent water convection above and below the floating heat insulation plate.

6. The heat storage device according to claim 1, characterized in that, The heat storage device also includes a position sensor, which is used to obtain the position information of the floating heat insulation plate.

7. A heating system, characterized in that, The heating system includes: The heat storage device according to any one of claims 1-6; Heat source module and energy load module; A pipeline module connected to the heat storage device, wherein the heat storage device is connected to the main pipeline between the heat source module and the energy load module through the pipeline module.

8. The heating system according to claim 7, characterized in that, The heat storage device includes a first inlet / outlet at the bottom and a second inlet / outlet at the top; the main pipeline includes a main water supply pipeline and a main return water pipeline; and the pipeline module includes a first valve, a second valve, a first water pump, and a second water pump. The inlet of the first water pump is connected to the second outlet / inlet, the outlet of the first water pump is connected to the main water supply pipeline, the first valve is located on a branch parallel to the first water pump, the inlet of the second water pump is connected to the first outlet / inlet, the outlet of the second water pump is connected to the main return water pipeline, and the second valve is located on a branch parallel to the second water pump.

9. The heating system according to claim 8, characterized in that, When the heating system is in a heat storage state, the first water pump is turned off, the first valve is opened, the second water pump is turned on, and the second valve is closed, so that the hot water from the main water supply pipe enters the heat storage device through the first valve and the second outlet / inlet, and the low-temperature water from the heat storage device enters the main return water pipe through the first outlet / inlet and the second water pump.

10. The heating system according to claim 8, characterized in that, When the heating system is in a heat release state, the first water pump is turned on, the first valve is closed, the second water pump is turned off, and the second valve is turned on, so that the hot water of the heat storage device enters the main water supply pipeline through the second outlet / inlet and the first water pump, and the low temperature water of the main return water pipeline enters the heat storage device through the second valve and the first outlet / inlet.

11. The heating system according to claim 8, characterized in that, When the heating system is in a non-heat storage and non-heat release state, the first water pump is shut off, the first valve is shut off, the second water pump is shut off, and the second valve is shut off.

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