Thermoelectricity hierarchical combined storage and combination system

Abstract

The invention discloses a thermoelectric hierarchical combined storage and utilization system which comprises a heating device, a first heat storage device, a second heat storage device and a heat exchange device, the first heat storage device comprises a first heat storage bin, one end of the first heat storage bin is communicated with the heating device, heat storage particles are arranged in the heat storage bin, and the second heat storage device comprises a second heat storage bin. Energy storage plates are longitudinally arranged in the second heat storage bin at intervals, the energy storage plates are filled with phase change heat storage media, one end of the second heat storage bin communicates with the other end of the first heat storage device, the other end of the second heat storage device communicates with the heating device, and one end of the heat exchange device communicates with the heating device; and the other end is communicated with the other end of the second heat storage bin. Therefore, according to the thermoelectric hierarchical combined storage and utilization system, hierarchical heat storage can be achieved, high-grade heat and medium-low-grade heat are fully utilized, the heat storage efficiency is improved, meanwhile, multi-category and multi-source energy sources or heat sources can be coupled, and fluctuating green electricity or waste heat is converted into heat energy to be stored; and when the energy is used, the heat energy stored in the phase change heat storage medium is released, so that the gap between intermittent energy and continuous requirements is filled up.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a thermal-electric cascade storage combined system. BACKGROUND

[0002] New energy electric heat conversion is a technology that converts new energy electric energy into heat energy for industrial production. Through the use of solar energy, wind energy or other renewable energy power generation, the generated electric energy is converted into heat energy through electric heat conversion technology. The electric energy is converted into heat energy to provide sufficient heat energy for industrial applications. This makes the industrial field able to rely on stable heat energy supply, while improving the utilization efficiency of new energy, and providing strong support for the transformation and upgrading of energy structure.

[0003] Due to the instability and intermittency of these new energy power generation, it is difficult to meet the stable heat energy demand of industry. Therefore, the characteristics of energy storage technology can bridge the gap between intermittent supply and continuous demand of energy, thereby gradually attracting people's high attention. Based on heat storage technology, the fluctuation problem of renewable energy power generation can be well solved. Unstable electric energy is converted into stable heat energy for storage to realize smooth output of energy, thereby improving the reliability and predictability of renewable energy. Secondly, heat storage technology can also improve energy utilization efficiency. Through the storage and flexible heating of heat energy, the energy utilization structure is optimized, and the energy consumption cost is reduced.

[0004] At present, in the heat storage technology, the research results of various heat storage materials are in full bloom, but the use mode of the heat storage system based on the heat storage medium is very single. These devices or systems are often limited to the same use scene, often causing high construction cost and repeated construction problems. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a thermal-electric cascade storage combined system.

[0006] The thermal-electric cascade storage combined system according to an embodiment of the present application comprises: a heating device, one side of the heating device is provided with an air inlet, and the other side is provided with an air outlet; a first heat storage device, the first heat storage device comprises a first heat storage bin, one end of the first heat storage bin is in communication with the air outlet, and the heat storage bin is provided with heat storage particles; a second heat storage device, the second heat storage device comprises a second heat storage bin, energy storage plates are longitudinally spaced in the second heat storage bin, the energy storage plates are filled with phase change heat storage medium, one end of the second heat storage bin is in communication with the other end of the first heat storage device, and the other end of the second heat storage device is in communication with the air inlet; A heat exchange device, one end of the heat exchange device being in communication with one end of the first heat storage device, and the other end of the heat exchange device being in communication with the other end of the second heat storage device.

[0007] According to some embodiments of the present application, the energy storage plate comprises a first plate body and a second plate body, a cavity being arranged between the first plate body and the second plate body, and the phase change heat storage medium being arranged in the cavity.

[0008] According to some embodiments of the present application, a first recess is arranged on the side surface of the first plate body, and a second recess is arranged on the side surface of the second plate body, and the first recess and the second recess are weldedly connected.

[0009] According to some embodiments of the present application, the first recess is semispherical, and / or the second recess is semispherical.

[0010] According to some embodiments of the present application, further comprising an energy storage tank, one end of the energy storage tank being in communication with the outlet of the energy storage plate, and the other end of the energy storage tank being in communication with the inlet of the energy storage plate, so as to circulate the phase change heat storage medium in the energy storage tank and the energy storage plate.

[0011] According to some embodiments of the present application, the phase change heat storage medium comprises any one of paraffin, solar salt and fatty acid.

[0012] According to some embodiments of the present application, the heat storage particles comprise one or more of quartz sand, brown corundum and molten salt.

[0013] According to some embodiments of the present application, the heat exchange device comprises any one of a boiler, a generator and a steam generator. Advantages

[0014] The thermal-electric hierarchical storage combined system of the present application can realize hierarchical heat storage, fully utilize high-grade heat and low-grade heat, improve heat storage efficiency, and further couple multiple types and multiple sources of energy or heat sources, convert fluctuating green electricity or waste heat into thermal energy for storage, and release the thermal energy stored in the phase change heat storage medium to generate zero-carbon steam, so as to bridge the gap between intermittent energy and continuous demand. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings, in which: Figure 1 is a whole schematic diagram of a thermal-electric hierarchical storage combined system according to an embodiment of the present application; Figure 2 is a three-dimensional structural schematic diagram of an energy storage plate according to an embodiment of the present application; Figure 3is a cross-sectional structure schematic diagram of a storage plate according to an embodiment of the present application.

[0016] Reference signs: 100, a thermoelectric cascade storage combined system; 1, a heating device; 11, an air inlet; 12, an air outlet; 2, a first heat storage device; 21, a first heat storage bin; 3, a second heat storage device; 31, a second heat storage bin; 4, a storage plate; 41, a first plate body; 411, a first recess; 42, a second plate body; 421, a second recess; 5, a heat exchange device; 6, a storage tank. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The description of the embodiments is actually only illustrative and exemplary, and is not as any limitation on the present application and its application or use; based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application. In addition, the known technologies, methods and devices for those skilled in the related art can not be discussed in detail, but should be regarded as part of the specification under appropriate circumstances.

[0018] In combination Figures 1 to 3 As shown in the drawings, the thermoelectric cascade storage combined system 100 of an embodiment of the present application comprises a heating device 1, a first heat storage device 2, a second heat storage device 3 and a heat exchange device 5, wherein one side of the heating device 1 is provided with an air inlet 11, and the other side is provided with an air outlet 12; the first heat storage device 2 comprises a first heat storage bin 21, one end of the first heat storage bin 21 is communicated with the air outlet 12, and the heat storage bin is provided with heat storage particles; the heat storage particles can adopt quartz sand, brown corundum and molten salt; the second heat storage device 3 comprises a second heat storage bin 31, the second heat storage bin 31 is longitudinally and spacedly provided with a storage plate 4, the inside of the storage plate 4 is filled with phase change heat storage medium, which can adopt, for example, paraffin, solar salt and fatty acid; one end of the second heat storage bin 31 is communicated with the other end of the first heat storage device 2, the other end of the second heat storage device 3 is communicated with the air inlet 11, one end of the heat exchange device 5 is communicated with one end of the first heat storage device 2, and the other end of the heat exchange device 5 is communicated with the other end of the second heat storage bin 31.

[0019] In use, the air is heated into high-temperature air by the heating device 1, the high-temperature air then enters the first heat storage device 2 to exchange heat with the heat storage particles, most of the heat is stored in the heat storage particles, the high-temperature air after heat exchange becomes medium-low temperature air, then enters the second heat storage device 3 to exchange heat with the storage plate 4, the heat is stored in the phase change heat storage medium in the storage plate 4, the air after heat release is recycled into the heating device 1 to be heated and warmed, thereby completing the whole heat storage cycle.

[0020] Similarly, when heat needs to be released, the air is first heated to medium-low temperature air by the second heat storage device 3, and then the heated medium-low temperature air enters the first heat storage device 2 to be heated again to become high-temperature air, and the high-temperature air enters the heat exchange device 5 to exchange heat, and the heat-exchanged air is circulated into the second heat storage device 3 and the first heat storage device 2 again to be heated, thereby realizing the heat release cycle of the system.

[0021] It should be noted here that the energy source of the heating device 1 can be electric heating or waste heat recovery. When the heat comes from waste heat recovery, the waste heat and waste heat in industrial production can be recovered and stored in the first heat storage device 2 and the second heat storage device 3. When the heat comes from electric heating, the excess electricity, valley electricity and fluctuating green electricity can be converted into heat by electric heating, and then stored in the first heat storage device 2 and the second heat storage device 3.

[0022] In particular, fluctuating electricity at least includes solar photovoltaic, tidal power generation and wind power generation. These green electricity generated by new energy equipment is greatly affected by weather and season. After the electric energy is converted into heat energy, the unstable or intermittent energy can be stored by using the heat storage system, and the energy can be converted when needed.

[0023] The heat exchange device 5 can be a boiler, a generator and a steam generator, which can convert the heat stored in the heat storage system into hot water, electricity or steam to meet different purposes.

[0024] Therefore, the heat and electricity hierarchical storage and combined system of the present application can realize hierarchical heat storage, fully utilize high-grade heat and medium-low grade heat, and improve the heat storage efficiency. At the same time, it can also couple multiple types and multiple sources of energy or heat source, convert fluctuating green electricity or waste heat into heat energy for storage, release the heat energy stored in the phase change heat storage medium to generate zero-carbon steam when needed, thereby bridging the gap between intermittent energy and continuous demand.

[0025] Further, on the basis of the above embodiments, as shown in Figure 2 or Figure 3 The energy storage plate 4 includes a first plate body 41 and a second plate body 42, and a cavity is provided between the first plate body 41 and the second plate body 42, and the phase change heat storage medium is arranged in the cavity. In this way, the heat exchange efficiency of the plate heat exchanger is higher, the heat loss is small, the structure is compact and light, and under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tube heat exchanger, the occupied area is one third of that of the tube heat exchanger, and the heat recovery rate can be as high as 90% or more.

[0026] Preferably, the side surface of the first plate body 41 is provided with a first recess 411, the side surface of the second plate body 42 is provided with a second recess 421, and the first recess 411 and the second recess 421 are weldedly connected, wherein the first recess is semispherical, and the second recess 421 is semispherical, so that the surface of the plate body is in a three-dimensional curved surface shape, and the actual heat transfer surface area can be significantly increased, and the heat transfer efficiency is improved.

[0027] At the same time, when the external air flows through the surface of the plate body, the shape of the plate surface structure will affect the secondary flow effect, that is, when the air flows, it will not only move forward along the flow direction, but also produce a rotating flow in the cross section perpendicular to the flow direction, so that the rotating secondary flow can bring the fluid of different temperatures from the plate wall to the center area of the air flow, or bring the fluid in the center area of the air flow to the plate wall, thereby greatly enhancing the radial (perpendicular to the flow direction) heat and mass exchange, and further improving the heat exchange efficiency.

[0028] Further, on the basis of the above embodiment, as shown in Figure 1 The thermoelectric hierarchical storage combined system 100 further comprises an energy storage tank 6, one end of the energy storage tank 6 is in communication with the outlet of the energy storage plate 4, and the other end is in communication with the inlet of the energy storage plate 4, so that the phase change heat storage medium can circulate and flow, and the heat storage medium after heat exchange in the energy storage plate 4 enters the energy storage tank 6.

[0029] In this process, the phase change heat storage medium flowing between the first plate body 41 and the second plate body 42 will be affected by the periodic change of the flow passage section, and constantly experience the cycle of contraction-expansion-recontraction-reexpansion, so that the fluid velocity and direction are constantly changed, which is beneficial to continuously destroy the thermal boundary layer between the phase change heat storage medium and the flow passage plate wall, reduce the thermal resistance of heat transfer, significantly improve the heat transfer coefficient, and improve the heat exchange efficiency.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In the description of the specification, reference to "one embodiment", "some embodiments", "an exemplary embodiment", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an exemplary embodiment", "an example", "a specific example", or "some examples" in various places in the specification are not necessarily referring to the same embodiment or example.

[0032] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to these embodiments. Rather, it is the intention that modifications, changes, substitutions, and variations be made to the embodiments disclosed herein without departing from the spirit and scope of the application, which is defined solely by the claims and their equivalents.

Claims

1. A staged combined heat and power storage system, characterized in that, include: A heating device, wherein an air inlet is provided on one side and an air outlet is provided on the other side; A first heat storage device, comprising a first heat storage chamber, one end of which is connected to the air outlet, and heat storage particles are disposed inside the heat storage chamber; The second thermal storage device includes a second thermal storage chamber, and energy storage plates are longitudinally spaced inside the second thermal storage chamber. The energy storage plates are filled with a phase change thermal storage medium. One end of the second thermal storage chamber is connected to the other end of the first thermal storage device, and the other end of the second thermal storage device is connected to the air inlet. A heat exchange device, one end of which is connected to one end of the first heat storage device, and the other end of which is connected to the other end of the second heat storage silo.

2. The combined heat and power (CHP) system according to claim 1, characterized in that, The energy storage plate includes a first plate and a second plate, with a cavity between the first plate and the second plate, and the phase change heat storage medium is disposed in the cavity.

3. A staged combined heat and power storage system according to claim 2, characterized in that, The first plate has a first recess on its side surface, and the second plate has a second recess on its side surface. The first recess and the second recess are welded together.

4. A staged combined heat and power storage system according to claim 3, characterized in that, The first recess is hemispherical, and / or the second recess is hemispherical.

5. A staged combined heat and power storage system according to any one of claims 2 to 4, characterized in that, Also includes: An energy storage tank is provided, with one end connected to the outlet of the energy storage plate and the other end connected to the inlet of the energy storage plate, so that the phase change thermal storage medium circulates within the energy storage tank and the energy storage plate.

6. A staged combined heat and power storage system according to claim 1, characterized in that, The phase change thermal storage medium includes any one of paraffin, solar salt, and fatty acids.

7. A staged combined heat and power storage system according to claim 1, characterized in that, The heat storage particles include one or more of quartz sand, brown corundum, and molten salt.

8. A staged combined heat and power storage system according to claim 1, characterized in that, The heat exchange device includes any one of a boiler, a generator, and a steam generator.

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