Heat storage and transfer system based on flow state intermediary

Abstract

The utility model discloses a heat storage and heat transfer system, and particularly relates to a heat storage and heat transfer system based on a flow state intermediary, which comprises a heat exchange unit, the heat exchange unit comprises a low-temperature heat exchange unit and a high-temperature heat exchange unit, a motion path of the heat exchange unit is provided with a heat absorption space and a heat release space, and when the system runs, the heat absorption space is communicated with the heat release space. The low-temperature heat exchange unit is transferred from the first transfer system to the heat absorption space to exchange heat with a heat source, and the high-temperature heat exchange unit is transferred from the second transfer system to the heat release space to heat a heat load; wherein the total heat exchange amount of the heat exchange units transferred to the heat absorption space and the heat release space is matched with the heat exchange demand quantity of the corresponding device, and the heat exchange amount of each heat exchange unit is independently controllable. And based on flowing of the phase-change heat exchange unit, heat energy transmission is achieved, storage of high-energy-density heat energy is guaranteed, and the maintenance and use cost of phase-change heat exchange is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange systems, and in particular to a heat storage and heat transfer system based on a fluid medium. Background Art

[0002] As global energy demand continues to grow, the development and utilization of energy has been widely discussed and studied. At this stage, energy thermal management technology has become an important technical means to improve energy utilization. Thermal management technology controls and manages the generation, transmission, storage and utilization of heat, which can effectively improve energy utilization and reduce energy consumption.

[0003] In the field of molten salt heat storage and heat exchange, the following problems exist in practical applications:

[0004] (1) Liquid molten salt is corrosive to a certain extent. Especially in high temperature environments, molten salt may corrode metals and other materials in contact with it. This corrosiveness may have a negative impact on the long-term stable operation of the molten salt heat storage system. At present, the main method to prevent the corrosiveness of molten salt is to select specific materials to make heat storage tanks and apply anti-corrosion coatings on heat storage tanks and molten salt transmission equipment. Regular maintenance and monitoring are required, the initial processing and production costs are high, and the subsequent maintenance work is complicated and the cost remains high.

[0005] (2) Liquid molten salt is stored in a heat storage tank. When releasing heat, it is difficult to accurately manage the amount of liquid molten salt released in a high-temperature environment according to the required heat, which easily causes heat waste.

[0006] (3) The heat exchange unit is usually piled up in the tank or installed on the heating surface. When dust accumulation and blockage occur, inspection and maintenance are inconvenient. When the heat exchange unit is damaged due to corrosion or other reasons, it cannot be replaced online.

[0007] (4) If the heat source or heat load carries impurities or dust, the heat exchange unit will be washed for a long time, which may cause serious wear of the heat exchange surface and the risk of local rupture of the heat exchange surface. In addition, when the impurity or dust content is too high, it is easy to form accumulation in the gaps of the heat exchange unit, blocking the medium flow channel and causing a decrease in heat exchange efficiency. Utility Model Content

[0008] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a heat storage and heat transfer system based on a fluid medium to solve the current technical problems.

[0009] The technical solution adopted by the utility model to solve its technical problems is:

[0010] The utility model provides a heat storage and heat transfer system based on fluid medium, comprising: a heat exchange unit, wherein the heat exchange unit comprises a low-temperature heat exchange unit and a high-temperature heat exchange unit, a heat absorption space and a heat release space are arranged on the movement path of the heat exchange unit, when the system is running, the low-temperature heat exchange unit is transferred to the heat absorption space by a first transfer system to exchange heat with a heat source, and the high-temperature heat exchange unit is transferred to the heat release space by a second transfer system to heat a heat load; wherein the total heat exchange amount of the heat exchange units transferred to the heat absorption space and the heat release space is adapted to the heat exchange demand of the corresponding device, and the heat exchange amount of each of the heat exchange units is individually controllable.

[0011] Preferably, one or more features including grooves, holes and protrusions are added to the surface of the heat exchange unit.

[0012] Preferably, a heat source is provided in the heat absorbing space, and a heat load is provided in the heat releasing space. The heat source circulates in the heat absorbing space, and the heat load circulates in the heat releasing space.

[0013] Preferably, a transfer space is provided on the movement passage of the low-temperature heat exchange unit.

[0014] Preferably, a heat storage space for keeping the high-temperature heat exchange unit warm is provided on the movement passage of the high-temperature heat exchange unit.

[0015] Preferably, the heat exchange unit comprises an outer shell, in which a phase change material is encapsulated, and the outer shell is a spherical or spheroidal outer shell, wherein the spheroidal outer shell comprises an ellipsoidal outer shell and a polyhedral outer shell.

[0016] Preferably, the heat exchange capacity of each of the heat exchange units is the same, and the size of the heat exchange unit is not less than 25 mm.

[0017] Preferably, the heat absorption space has a heat source input port and a heat source output port for heat source circulation, and the heat source input port is below the heat source output port. The heat release space is provided with a heat load input port and a heat load output port for heat load circulation, and the heat load input port is below the heat load output port.

[0018] Preferably, the first transfer system and the second transfer system are connected to form a passage for circulation of the heat exchange unit.

[0019] Preferably, the first transfer system is open or semi-open, and the second transfer system is closed.

[0020] The beneficial effects of the utility model are:

[0021] Based on the flow of the phase change heat transfer unit, the transmission of thermal energy is achieved, which not only ensures the storage of high energy density thermal energy, but also reduces the maintenance and use costs of the phase change heat transfer unit.

[0022] By selecting a spherical or spherical-like outer shell, the contact time between the heat source and the heat load for circulation and sufficient heat exchange is solved, thereby improving the reliability of phase change process control.

[0023] Based on independently circulated heat exchange units, the three operating mode control methods of heat storage, heat release and heat storage and release in parallel are realized. It has flexible operation, good economy, high utilization rate, wide application range, and can be coupled with other energy systems to realize multiple functions. It has broad application prospects and value.

[0024] Increasing the heat storage space and transfer space, isolating the heat absorption space and the heat release space, improving the flexibility of the equipment, and independently controlling and optimizing the heat release and heat absorption processes to achieve precise control of energy utilization.

[0025] The heat absorption and heat release are two closed spaces respectively, which effectively avoids the transfer of excess impurities and ensures the purity of the medium.

[0026] As a separate system, the transfer system is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 It is a structural schematic diagram of a heat storage and heat transfer system based on a fluid medium according to an embodiment of the utility model;

[0029] Figure 2 It is a structural schematic diagram of a heat exchange unit of a heat storage and heat transfer system based on a fluid medium according to an embodiment of the utility model;

[0030] Figure 3 It is a coating structure of a heat exchange unit shell of a heat storage and heat transfer system based on a fluid medium in an embodiment of the utility model;

[0031] Figure 4 It is a schematic structural diagram of the shell of the ellipsoidal heat exchange unit of the heat storage and heat transfer system based on the fluid medium in the embodiment of the utility model;

[0032] Figure 5 It is a schematic cross-sectional structural diagram of the shell of the ellipsoidal heat exchange unit of the heat storage and heat transfer system based on the fluid medium according to the embodiment of the utility model;

[0033] Figure 6 It is a structural schematic diagram of the shell of the hole-groove sphere heat exchange unit of the heat storage and heat transfer system based on the fluid medium of the embodiment of the utility model;

[0034] Figure 7It is a schematic cross-sectional structural diagram of the shell of the hole groove sphere heat exchange unit of the heat storage and heat transfer system based on the fluid medium of the embodiment of the utility model;

[0035] Figure 8 It is a structural schematic diagram of a convex sphere heat exchange unit shell of a heat storage and heat transfer system based on a fluid medium in an embodiment of the utility model;

[0036] Fig. 9 It is a schematic cross-sectional structural diagram of the outer shell of the convex sphere heat exchange unit of the heat storage and heat transfer system based on the fluid medium of the embodiment of the utility model;

[0037] Fig.10 It is a structural schematic diagram of a polyhedron heat exchange unit shell of a heat storage and heat transfer system based on a fluid medium according to an embodiment of the utility model;

[0038] Fig.11 It is a schematic cross-sectional structural diagram of the shell of a polyhedron heat exchange unit of a heat storage and heat transfer system based on a fluid medium according to an embodiment of the utility model.

[0039] Description of Reference Numerals

[0040] exist Figure 1-Figure 11 In the figure, the shell 1; the phase change material 2; and the anti-corrosion coating 3. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] The utility model provides a heat storage and heat transfer system based on a fluid medium. The heat storage and heat transfer system based on a fluid medium realizes the control of the heat storage and heat transfer process through a plurality of heat exchange units with circulatory flow and fixed heat storage amount.

[0043] The system includes:

[0044] Heat absorption space: A closed space where the low-temperature heat exchange unit exchanges heat with the heat source. The space is provided with two ports for heat source input and output, which are used for the circulation of the heat source; the space also includes the heat exchange unit input and output ends, the input end is used to add the low-temperature heat exchange unit to the heat absorption space, and the output end is used to release the high-temperature heat exchange unit.

[0045] Heat release space: A closed space where a high-temperature heat exchange unit exchanges heat with a heat load. The heat release space has two ports, a heat load input and output, for the circulation of the heat load; it also includes a heat exchange unit input and output. The input is used to add a high-temperature heat exchange unit to the heat release space, and the output is used to release a low-temperature heat exchange unit.

[0046] Preferably, the heat source and heat load input ends are located below the output end, and the heat exchange unit input end is located above the output end. This is because the transfer system needs to transfer the heat exchange unit from below the heat absorption or heat release space, so the lower heat exchange unit needs to be a high-temperature or low-temperature heat exchange unit after the internal phase change material 2 completes the phase change. After the heat source or heat load is input from below, the first to contact the heat exchange is the lower heat exchange unit closest to the heat source or heat load input end. Compared with the upper heat exchange unit, the contact heat exchange time is longer and the temperature difference during contact is also greater.

[0047] The number of ports for heat source or heat load input and output can be selected based on the granularity, fluidity and desired flow effect of the heat source or heat load.

[0048] The first transfer system: between the heat release space and the heat absorption space, the low-temperature heat exchange unit is transferred from the heat release space to the heat absorption space, and a device such as a bucket lift or a belt that can transport solids can be selected. Optimally, the first transfer system can be open or semi-open, for example, the shell of the transport device has an opening, so that the heat exchange unit that is deformed or damaged can be observed and replaced.

[0049] Preferably, the first transfer system is provided with an input end and an output end, wherein the input end of the first transfer system is connected to the output end of the heat exchange unit of the heat release space, and the output end is connected to the input end of the heat exchange unit of the heat absorption space.

[0050] Second transfer system: between the heat absorption space and the heat release space, the high temperature heat exchange unit is transferred from the heat absorption space to the heat release space, and a device such as a bucket lift, a belt, etc. that can transport solids can be selected. Optimally, the transfer system is closed and has a heat preservation effect, such as wrapping the outer shell of the transport device with heat insulation cotton or other heat preservation materials.

[0051] Preferably, the second transfer system is provided with an input end and an output end, wherein the input end of the second transfer system is connected to the output end of the heat exchange unit of the heat absorption space, and the output end of the second transfer system is connected to the input end of the heat exchange unit of the heat release space.

[0052] Heat exchange unit: including high-temperature heat exchange unit and low-temperature heat exchange unit, and phase change material 2 encapsulated by spherical or spheroidal shell 1; different heat exchange units can circulate independently in heat absorption space, heat release space and other areas to store and release heat. The interior is filled with phase change material 2, and during the phase change process of phase change material 2, the substance changes from one phase to another, such as solid to liquid or liquid to gas. This phase change process is accompanied by the release or absorption of latent heat, so that the phase change material 2 can store or release a large amount of thermal energy with a small temperature change. Compared with traditional heat exchange technology, the advantages of heat exchange technology using phase change material 2 are its high energy density, high thermal conductivity and controllable temperature change range. The selection and design of phase change material 2 can be optimized according to the needs of specific applications to achieve the best thermal energy storage and transfer effect.

[0053] Preferably, the phase change material 2 encapsulated in each heat exchange unit has the same formula and has uniform mass and volume, so that the heat exchange capacity of the heat exchange unit is the same; or the phase change material 2 in the heat exchange unit has different formulas and masses, but different formulas are selected to fill different masses, which also makes the heat exchange capacity of each heat exchange unit the same.

[0054] The heat transfer capacity of the heat exchange unit and the size of the heat exchange unit are related to the formulation of the phase change material 2 and the quality of the filling, so that the heat transfer capacity of each heat exchange unit is controllable, which is convenient for system calculation and regulation.

[0055] When selecting the diameter of the shell 1 of the heat exchange unit, factors such as heat exchange amount and heat exchange area, heat exchange time, type and chemical composition of heat storage medium should be considered, and optimized to achieve the best performance. Based on comprehensive considerations, the diameter of the shell 1 should not be less than 25mm, and can be selected between 30mm and 150mm to meet the functional requirements of the system.

[0056] Preferably, the heat exchange unit shell can be made of a material with high strength, good thermal conductivity, high temperature resistance, and certain corrosion resistance, such as ordinary carbon steel, stainless steel, polytetrafluoroethylene, etc.

[0057] Optimized, the heat exchange unit shell material can also be made of PPS alloy (polyphenylene sulfide alloy). PPS is a special engineering plastic with excellent physical and chemical properties. It has excellent performance in terms of high mechanical strength, high temperature resistance, high flame retardancy, corrosion resistance, high hardness, and thermal stability. PPS alloy can be made by blending or compounding with other polymers or fillers, while retaining the original performance and solving its shortcomings of fragility and low wear resistance.

[0058] Optimally, the components of the heat exchange medium and the phase change material 2 may cause corrosion to the heat exchange unit. In order to prevent corrosion, anti-corrosion coatings can be applied to the inner and outer walls of the heat exchange unit. For example, corrosion-resistant silicone coatings, arc spraying of rare earth alloys, epoxy glass coatings, etc.

[0059] Optimally, the shape of the shell 1 of the heat exchange unit may be, in addition to a sphere, an ellipsoid, a sphere with holes and grooves, a sphere with convex points, a polyhedron, etc.

[0060] Optimized, in order to ensure better use effect and increase the heat exchange area, the heat exchange unit can choose to add single or combined structural features such as grooves, holes, and convex points. Groove: The groove-like part of the heat exchange unit surface that is concave on the periphery and far from the circle and close to the center of the circle. Hole: The inner surface part of the heat exchange unit, which can be a special-shaped hole or a closed hole. Convex point: The raised point-like part on the surface of the heat exchange unit.

[0061] Heat source: that is, heat carrier, high-temperature medium, medium used to transfer heat to the low-temperature heat exchange unit, such as flue gas, steam, heat transfer oil, etc.

[0062] Heat load: that is, cold carrier, low-temperature medium, the medium used to absorb heat from the high-temperature heat exchange unit, such as air, water, etc.

[0063] Transfer space: A closed space used to place low-temperature heat exchange units.

[0064] Heat storage space: a closed space for storing high-temperature heat exchange units. The heat storage space is a heat preservation space. Even if the high-temperature heat exchange unit has been in the space for a long time, such as 12 hours, it can still maintain a high temperature so that the phase change material 2 in the heat exchange unit does not reach the temperature critical point of low-temperature phase change.

[0065] Among them, the heat exchange unit, the heat absorption space, and the heat source constitute a heat storage system of the heat exchange unit, and the heat load, the heat release space, and the heat exchange unit constitute a heat transfer system of the heat exchange unit.

[0066] The working principle of the heat storage and heat transfer system based on fluid medium is as follows:

[0067] For the heat storage process: the low-temperature heat exchange unit is transferred to the heat absorption space through the first transfer system, the heat carrier enters the heat absorption space from the heat source input end of the heat absorption space, and after fully contacting and exchanging heat with the low-temperature heat exchange unit in the heat absorption space, the cooled heat carrier is released from the heat source output end of the heat absorption space; after fully contacting and exchanging heat with the heat carrier, the phase change material 2 in the low-temperature heat exchange unit undergoes a phase change and becomes a high-temperature heat exchange unit to complete heat storage.

[0068] For the heat transfer process: the high-temperature heat exchange unit after completing heat storage is transferred to the heat release space through the second transfer system, and the cold carrier enters the heat release space from the heat load input end of the heat release space, and after fully contacting and exchanging heat with the high-temperature heat exchange units stacked in the heat release space, the heated cold carrier is released from the heat load output end of the heat release space; after fully contacting with the cold carrier, the phase change material 2 in the high-temperature heat exchange unit undergoes a phase change and becomes a low-temperature heat exchange unit to complete the heat transfer process.

[0069] The realization of the above two processes relies on the random stacking of heat exchange units with spheres or spheroidal shells 1 of the same diameter in a fixed space to form a stacked bed; since the heat exchange units are spheres or spheroids with the same shape and size, the stacked bed can ensure a minimum void ratio of 25.95%, and the voids are usually interconnected. Due to the large degree of distortion in the random stacking arrangement space, the flow path of the medium between the voids of the stacked bed heat exchange units is random and disordered. Sufficient flow channels are reserved for the heat source and heat load, extending the flow time. This improves the reliability of the phase change process control.

[0070] In the heat storage and transfer process of this scheme, the low-temperature heat exchange unit stores heat and becomes a high-temperature heat exchange unit, and the high-temperature heat exchange unit releases heat and becomes a low-temperature heat exchange unit. In these two processes, the changes in the material state of the phase change material 2 in the heat exchange unit are opposite. For example, when the low-temperature heat exchange unit stores heat and becomes a high-temperature heat exchange unit, the phase change material 2 in the heat exchange unit will gradually change from solid to liquid, absorbing and storing heat; and when the high-temperature heat exchange unit releases heat and becomes a low-temperature heat exchange unit, the phase change material 2 in the heat exchange unit will gradually change from liquid to solid, releasing and transferring the stored heat.

[0071] Optimized, this solution can set up a heat storage space and a transfer space. After the heat exchange unit completes heat storage in the heat absorption space and becomes a high-temperature heat exchange unit, it is transferred to the heat storage space by the transfer system for heat preservation. When heat is needed, it is transferred to the corresponding number of high-temperature heat exchange units in the heat release space for heat transfer according to the load demand of the heat load. Conversely, when the high-temperature heat exchange unit completes heat release in the heat release space and becomes a low-temperature heat exchange unit, it is transferred to the transfer space by the transfer system. When there is a demand for external energy input, it is transferred to the corresponding number of low-temperature heat exchange units in the heat absorption space for heat storage according to the load demand of the heat source. This solution is a deep decoupling of the heat release space and the heat absorption space, realizing independent control and optimization of the heat release and heat absorption processes, and improving energy utilization efficiency.

[0072] In the optimization scheme, the heat storage space is an insulation space. Even if the high-temperature heat exchange unit is in the space for a long time, such as 12 hours, it can still maintain a high temperature so that the phase change material 2 in the heat exchange unit does not reach the temperature critical point of the low-temperature phase change.

[0073] Specifically, the fluid-based heat storage and heat transfer system has three operating modes:

[0074] Heat storage mode: The heat exchange unit is transported to the heat absorption space through the transfer system to store heat and then transferred to the heat storage space for heat preservation, thus realizing energy storage. It is suitable for working conditions with external energy input but no energy demand.

[0075] Heat release mode: The heat exchange unit is transported to the heat release space through the transfer system for heat transfer and then transferred to (the transfer space is cooled naturally), thus realizing the release of energy. It is suitable for working conditions with no external energy input and simple heat extraction.

[0076] Heat storage and release parallel mode: The heat exchange unit is transported to the heat absorption space through the transfer system to store heat, then transferred to the transfer system to transport to the heat storage space for heat preservation, then transferred to the transfer system to transport to the heat release space for heat transfer, then transferred to the transfer system to transport to the transit space, and then transferred to the transfer system to transport to the heat release space for heat storage. This cycle realizes the simultaneous storage and release of energy and the reuse of the heat exchange unit. It is suitable for working conditions where there is a need for simultaneous energy storage and use, or a need to stabilize the output of unstable energy sources.

[0077] Specific application: The heat source is high-temperature flue gas. The heat comes from the flue gas after passing through the economizer in the boiler system. When the high-temperature flue gas enters the heat absorption space and fully contacts the low-temperature heat exchange unit, its heat is transferred to the low-temperature heat exchange unit. The phase change material 2 in the low-temperature heat exchange unit undergoes a phase change, completes the heat storage process, and is transformed into a high-temperature heat exchange unit. After heat exchange, the high-temperature flue gas will be introduced into the dust removal equipment for further processing. The transfer system calculates and controls the rate of the transfer heat exchange unit according to the temperature, flow rate and other data monitored by the air input and output sensors of the heat release space, so that the heat exchange of the transferred heat exchange unit matches the heat exchange required by the heat load. The air enters the heat release space and fully contacts the high-temperature heat exchange unit for heat exchange. The phase change material 2 in the high-temperature heat exchange unit releases heat after phase change and is transformed into a low-temperature heat exchange unit. The heated air continuously flows into the boiler system. The heated air flows into the boiler system, which helps the ignition of the fuel, stabilizes the combustion and improves the combustion efficiency. Correspondingly, the low-temperature heat exchange unit is continuously transferred to the heat absorption space for heat exchange by the transfer system according to the rate and quantity calculated by the temperature, flow rate and other data monitored by the sensor device at the flue gas input and output end of the heat absorption space. The transfer system device is semi-open, and an opening is added at a suitable position on the device as an equipment observation window to facilitate the observation of the status of the heat exchange unit at any time, and to replace the heat exchange unit that is severely worn and deformed when necessary. This cycle process adopts a heat storage and release parallel mode, which releases heat while storing heat, which not only reduces the exhaust temperature of the boiler, but also effectively utilizes the waste heat of the boiler flue gas, thereby improving energy utilization.

[0078] The heat source is heat produced based on solar energy (the medium circulating in the collector pipe, such as heat transfer oil, air, etc.). Through the focusing effect of the solar concentrator, the sunlight is irradiated on the medium circulating in the collector pipe with high intensity. This process will cause the temperature of the medium to rise rapidly, thereby transforming into a high-temperature medium. When the high-temperature medium is input into the heat absorption space of this system and fully contacts the low-temperature heat exchange unit in the heat absorption space, its heat is transferred to the low-temperature heat exchange unit. The phase change material 2 in the low-temperature heat exchange unit undergoes a phase change, completes the heat storage process, and transforms into a high-temperature heat exchange unit. After the heat exchange process, the cooled high-temperature medium will flow back into the collector pipe and continue to participate in the cycle. The transfer system can continuously transfer the high-temperature heat exchange unit to the heat storage space for insulation at a pre-calculated and formulated rate. When the number of high-temperature heat exchange units is small, insulation is directly performed in the transfer system. The surface of the transfer system device is wrapped with a layer of insulation cotton or coated with insulation paint to reduce the thermal conductivity and increase the thermal resistance, thereby achieving the effect of thermal insulation. When there is energy demand, the transfer system is started again to transfer the high-temperature heat exchange unit to the heat release space, and the low-temperature medium is introduced into the heat release space so that it is fully in contact with the high-temperature heat exchange unit and heat exchange is carried out. After the phase change material 2 in the high-temperature heat exchange unit releases heat through the phase change process, it will be transformed into a low-temperature heat exchange unit. The heated low-temperature medium (depending on the actual working scene, the medium for heat exchange with the high-temperature heat exchange unit in the heat release space may also be different) will continue to flow into the device with energy demand to provide it with the required thermal energy. This process adopts two modes of heat storage and heat release, storing heat when there is energy input and releasing heat when there is energy output demand. For example, the solar energy collected during the day is stored and released when needed (such as at night or on rainy days) to optimize energy utilization.

[0079] The heat source is heat generated based on wind power (a medium heated by methods such as converting electrical energy into thermal energy, generating thermal energy using a heat pump, or direct heat conversion). The heated high-temperature medium transfers heat to the low-temperature heat exchange unit through a heat absorber, and the phase change material 2 in the low-temperature heat exchange unit completes the phase change and becomes a high-temperature heat exchange unit. These high-temperature heat exchange units can store thermal energy and release it when needed, thereby realizing the transformation from fluctuating energy to stable energy.

[0080] Especially in the process of wind power generation, the generator converts wind energy into electrical energy. Then, the electrical energy is further converted into thermal energy, which is used to heat the medium and transfer heat to the heat exchange unit. The temperature of the thermal energy converted from this electrical energy can reach above 900°C, so that the energy storage temperature is maintained at a high level, thereby improving the energy storage efficiency. In this way, although an energy conversion process is added, the energy can be stored in a high-grade form, thereby improving the exergy efficiency. Since high-grade energy storage means more efficient utilization, we can more effectively apply this energy to application systems that require high energy density.

[0081] The heat source comes from the power generation unit. When the power generation unit needs to quickly adjust the peak, the high-temperature and high-pressure steam from the main steam bypass, the heating surface of the power generation unit or its outlet, or the high-pressure and medium-pressure cylinder of the steam turbine enters the heat absorption space to exchange heat with the low-temperature heat exchange unit. The cooled high-temperature and high-pressure steam returns to the condenser, realizing the energy storage of high-temperature and high-pressure steam. This process also ensures the rapid, stable and economic peak adjustment of the power generation system.

[0082] More specifically, the power generation unit is a thermal power generation unit, and the gas output from the heat load output end of the heat release space of the system of the utility model is used as a part of the combustion wind of the thermal power generation unit. The application coupled with the power generation unit is that the heat released by the high-temperature heat exchange unit in the heat release space can be used in the power generation system, for example, the medium flowing through the heat release space is air used for boiler combustion organization or boiler feed water.

[0083] Technical Effects

[0084] The heat exchange unit independently encapsulates the phase change material 2 through the shell 1, realizes independent circulation in the heat absorption space and the heat release space, is easy to detect, repair and replace, and reduces the difficulty and cost of maintenance.

[0085] The phase change material 2 encapsulated in each heat exchange unit has the same formula and quality, so that the heat absorption and heat release of each heat exchange unit are consistent. The heat storage value of the heat exchange unit is fixed. When releasing heat, the number of heat exchange units required can be accurately calculated according to the heat demand, reducing heat energy waste and improving the accuracy of heat energy management.

[0086] The heat exchange capacity of each heat exchange unit is individually controllable, which facilitates the calculation and control of the usage of the heat exchange unit, so that the input or output heat can be stably controlled within a relatively precise range, matching the heat exchange capacity required by the heat load, and achieving effective control and optimal utilization of energy.

[0087] The heat exchange unit housing 1 is made of a sphere or a spherical shape, which is conducive to identifying damage, easy to clean, and convenient to separate from the medium. At the same time, the heat source and heat load are circulated, ensuring that the heat exchange unit is in full contact with them for heat exchange. In addition, the heat exchange units at the bottom of the heat absorption space and the heat release space are continuously rotated out, so that the heat exchange units previously located at the upper layer are closer to the heat source or heat load input port, further enhancing the heat exchange effect.

[0088] The heat source and heat load enter from the bottom of the heat absorption space and the heat release space respectively, and then are output from the top of the space, which can effectively control the heat exchange units at the bottom of the heat absorption and heat release spaces to exchange heat first, while the heat exchange units at the top have sufficient heat exchange time, thereby improving the heat exchange efficiency of the system.

[0089] The flow of heat exchange units realizes the transmission of thermal energy and heat in two closed spaces, effectively avoiding the transfer of excess impurities and ensuring the purity of the medium.

[0090] The flow circulation of the heat exchange unit is realized through the transfer system. In addition, the transfer system is a separate system with strong expandability.

[0091] Increase heat storage space and transfer space to isolate the heat release space from the heat absorption space, thereby achieving independent control and optimization of the heat release and heat absorption processes and improving energy utilization efficiency.

[0092] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat storage and heat transfer system based on fluid medium, comprising: A heat exchange unit, characterized in that: the heat exchange unit comprises a low-temperature heat exchange unit and a high-temperature heat exchange unit, and a heat absorption space and a heat release space are arranged on the movement path of the heat exchange unit. When the system is running, the low-temperature heat exchange unit is transferred by the first transfer system to the heat absorption space to exchange heat with the heat source, and the high-temperature heat exchange unit is transferred by the second transfer system to the heat release space to heat the heat load; wherein the total heat exchange amount of the heat exchange units transferred to the heat absorption space and the heat release space is adapted to the heat exchange demand of the corresponding device, and the heat exchange amount of each of the heat exchange units is individually controllable.

2. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: One or more features including grooves, holes and convex points are added to the surface of the heat exchange unit.

3. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: A heat source is arranged in the heat absorption space, and a heat load is arranged in the heat release space. The heat source circulates in the heat absorption space, and the heat load circulates in the heat release space.

4. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: A transfer space is provided on the movement passage of the low-temperature heat exchange unit.

5. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: A heat storage space for keeping the high-temperature heat exchange unit warm is provided on the movement passage of the high-temperature heat exchange unit.

6. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: The heat exchange unit comprises an outer shell, in which a phase change material is encapsulated, and the outer shell is a spherical or spheroidal outer shell, wherein the spheroidal outer shell comprises an ellipsoidal outer shell and a polyhedral outer shell.

7. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: The heat exchange capacity of each heat exchange unit is the same, and the size of the heat exchange unit is not less than 25mm.

8. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: The heat absorbing space has a heat source input port and a heat source output port for heat source circulation, and the heat source input port is below the heat source output port. The heat releasing space is provided with a heat load input port and a heat load output port for heat load circulation, and the heat load input port is below the heat load output port.

9. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: The first transfer system and the second transfer system are connected to form a passage for the heat exchange unit to circulate.

10. The heat storage and heat transfer system based on fluid medium according to claim 1, characterized in that: The first transfer system is open or semi-open, and the second transfer system is closed.

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