An ultrahigh-temperature solid-state sensible heat storage and thermal photovoltaic power generation system

Abstract

The application relates to an ultrahigh-temperature solid-state sensible heat storage and thermophotovoltaic power generation system, which comprises a heating module, an energy storage-radiation module, a cooling module and a heat insulation module; the energy storage-radiation module is high in heat conductivity and is used for receiving the heat of the heating module to store energy and externally emit infrared radiation energy; the cooling module is used for cooling a thermoelectric conversion module; and the heat insulation module is used for keeping the ambient temperature; the heating module, the energy storage-radiation module, the thermoelectric conversion module and the heat insulation module are installed on the heat insulation module. 1) The application is an ultrahigh-temperature sensible heat storage system, can utilize the high-temperature high-specific-heat characteristics of a heat storage material, and can greatly improve the energy storage density compared with traditional energy storage technology; 2) The application utilizes the high thermal conductivity and excellent electrical properties of the heat storage material, increases the energy storage system charging and discharging rate and output power; 3) The application can adopt a high-temperature heat storage material, and can greatly improve the thermoelectric conversion efficiency of a photovoltaic panel through spectrum regulation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal energy storage, in particular to a super-high-temperature solid-state sensible heat storage and thermal photovoltaic power generation system. BACKGROUND

[0002] Most new energy sources have the problems of volatility and intermittency. Energy storage technology is an important way to solve the above problems of new energy. Up to now, energy storage technology has developed in the following three directions: first, mechanical energy storage, represented by pumped storage and compressed air energy storage, both of which are mature in technology, but have special requirements for geographical conditions in practical application; second, electrochemical energy storage, represented by lithium ion batteries, which has high efficiency, good cycle characteristics and high energy density, and is widely used in electronic equipment and automobile industry, but its high cost and safety problems are still difficult to break through in the application scenario of large-scale energy storage; third, thermal energy storage technology, compared with the first two types of energy storage technology, thermal energy storage technology has no geographical restrictions, and the heat storage medium can use low-cost materials, which has advantages in cost and safety in the scenario of large-scale application.

[0003] The current mature heat storage technology is molten salt heat storage. This technology stores heat in the form of sensible heat by heating molten salt, and improves the heating and heat releasing speed by convective heat transfer. The technology path is simple and reliable, and has been widely used in solar thermal power generation and industrial energy storage. However, the temperature of molten salt energy storage technology is low, and the energy storage density is low. At the same time, the latent heat of high-temperature molten salt fluid has the risk of leakage, which is easy to cause safety accidents. Generally speaking, the higher the temperature of energy storage material, the greater the specific heat capacity. If the heat is stored at high temperature, not only the energy storage density can be greatly improved, but also the energy grade can be improved. For example, the energy storage density of 1000-2000℃ graphite charging and discharging can reach 1294kWh / m 3 , which is more than three times that of electrochemical energy storage. SUMMARY

[0004] In view of the above problems, the present application provides a super-high-temperature solid-state sensible heat storage and thermal photovoltaic power generation system, which aims to realize rapid heating of heat storage material by using the high electrical conductivity and high thermal conductivity of graphite material, rapid heat storage, high energy storage density by using the high specific heat capacity of heat storage material at super-high temperature, high system discharge power by using high thermal conductivity and large temperature difference, and high conversion efficiency by using the spectrum control of emitter coating and the back reflection of thermal photovoltaic film to inhibit the emission and absorption of low-energy photons, so as to realize large-scale, low-cost and high-efficiency power storage of power grid.

[0005] The specific technical solutions are as follows:

[0006] A super-high-temperature solid-state sensible heat storage and thermal photovoltaic power generation system, comprising:

[0007] a heating module for heating the heat storage-radiation module;

[0008] a heat storage-radiation module, which is high in thermal conductivity, for receiving heat from the heating module to store energy and emit infrared radiation energy;

[0009] a thermoelectric conversion module for receiving energy from the heat storage-radiation module and converting it into electrical energy;

[0010] a cooling module for cooling the thermoelectric conversion module; and

[0011] a heat insulation module for maintaining ambient temperature, the heating module, the heat storage-radiation module, the thermoelectric conversion module and the heat insulation module being installed on the heat insulation module;

[0012] When there is excess electrical energy, the heating module is connected to the circuit, and the heat storage-radiation module is heated to a high temperature under the condition of power supply to store energy; when there is insufficient electrical energy, the thermoelectric conversion module receives energy from the heat storage-radiation module and converts it into electrical energy.

[0013] Further, the heat insulation module comprises an outer shell, an inner shell, and a heat insulation plug plate, the inner shell is installed in the outer shell, the heat insulation plug plate is provided with a conversion through hole, and the heat insulation plug plate is slidably installed in the inner shell, the heating module, the heat storage-radiation module and the thermoelectric conversion module are installed in the inner shell, and the heat storage-radiation module and the thermoelectric conversion module have a radiation heat exchange channel therebetween.

[0014] When there is excess electrical energy, the heat insulation plug plate is slid and closes the radiation heat exchange channel, the heating module is connected to the circuit and heated to a high temperature, and the heat storage-radiation module is heated and stores energy; when there is insufficient electrical energy, the heat insulation plug plate is slid to open the radiation heat exchange channel through the conversion through hole, and the thermoelectric conversion module receives energy from the heat storage-radiation module and converts it into electrical energy.

[0015] Further, the heat insulation module further comprises a heat spreading plate, the heat spreading plate is installed in the inner shell, the heat spreading plate is located above the heat storage-radiation module, and one side of the heat spreading plate away from the heat storage-radiation module is covered with a selective emission coating.

[0016] Further, the heating module is a heating electrode.

[0017] Further, the heat storage-radiation module is made of high thermal conductivity material.

[0018] Further, the high thermal conductivity material is one or more of metal oxide, metal nitride, metal carbide or graphite and composite materials thereof.

[0019] Further, the thermoelectric conversion module is a thermophotovoltaic.

[0020] Further, the cooling module comprises a cooling plate, a cooling cavity is arranged in the cooling plate, the cooling cavity is communicated with the refrigerant inlet pipe and the refrigerant outlet pipe, and the thermoelectric conversion module is installed on the cooling plate.

[0021] The above-mentioned scheme has the following beneficial effects:

[0022] 1) The present application is an ultra-high temperature sensible heat storage system, which can utilize the high temperature and high specific heat characteristics of the heat storage material, and can greatly improve the energy storage density compared with traditional energy storage technology;

[0023] 2) The present application utilizes the high thermal conductivity (5-200 W / (m·K)) of the heat storage material (graphite) to improve the charging and discharging rate of the energy storage system and the output power, and can realize the rapid storage and release of electric energy;

[0024] 3) The present application can use high-temperature heat storage materials, and can greatly improve the thermoelectric conversion efficiency of the photovoltaic panel by using spectral regulation;

[0025] 4) The present application adopts a non-contact heat exchange mode, which has small volume, no noise, long service life and no environmental restrictions. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Fig. 1 is a structural schematic diagram of a power generation system provided in an embodiment of the present application;

[0027] Figure 2 Fig. 4 is a performance test diagram of an energy storage-radiation module.

[0028] In the drawings: 10, heating module; 11, heating wire; 12, insulating ceramic; 20, energy storage-radiation module; 30, thermoelectric conversion module; 40, cooling module; 41, cooling plate; 50, heat insulation module; 51, outer shell; 52, inner shell; 53, heat insulation plugboard; 54, heat spreading plate. DETAILED DESCRIPTION

[0029] 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. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0031] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited by the present application.

[0032] As Figure 1As shown, the super-high-temperature solid-state sensible heat storage and thermal photovoltaic power generation system provided in the embodiment of the present application comprises a heating module 10, an energy storage-radiation module 20, a thermoelectric conversion module 30, a cooling module 40, and a cooling module 40; the energy storage-radiation module 20 is used to quickly receive the heat of the heating module 10, to store energy and to emit infrared radiation energy externally; the thermoelectric conversion module 30 is used to receive the energy of the energy storage-radiation module 20 and to convert it into electric energy externally; the cooling module 40 is used to cool the thermoelectric conversion module 30; the cooling module 40 is used to maintain the ambient temperature, and the heating module 10, the energy storage-radiation module 20, the thermoelectric conversion module 30, and the heat insulation module 50 are installed on the heat insulation module 50.

[0033] In the present application, when the electric energy is in excess, the heating module 10 (preferably a heating electrode) is connected to the circuit, and the energy storage-radiation module 20 is heated, so as to be warmed to a high temperature to store energy; when the electric energy is insufficient, the thermoelectric conversion module 30 (preferably a thermal photovoltaic) receives the energy of the energy storage-radiation module 20 and converts it into electric energy externally.

[0034] As a specific example, as shown in Figure 1 As shown, in the present application, the energy storage-radiation module 20 is provided with a through hole, the heating wire 11 in the heating module 10 is arranged in the through hole, and the heating wire 11 and the energy storage-radiation module 20 are separated by the insulating ceramic 12; under the above structure, when the heating wire 11 is connected to the circuit and heated to a high temperature, the energy storage-radiation module 20 can be heated and warmed to store energy.

[0035] As a specific example, as shown in Figure 1 As shown, in the present application, the heat insulation module 50 comprises an outer shell 51, an inner shell 52, and a heat insulation plug plate 53; the inner shell 52 is installed in the outer shell 51, the heat insulation plug plate 53 is provided with a conversion through hole, the heat insulation plug plate 53 is slidingly installed on the inner shell 52, the heating module 10, the energy storage-radiation module 20, and the thermoelectric conversion module 30 are installed in the inner shell 52, and the energy storage-radiation module 20 and the thermoelectric conversion module 30 have a radiation heat exchange channel; under the above structure, when the electric energy is in excess, the heat insulation plug plate 53 is slid to close the radiation heat exchange channel, the heating module 10 is connected to the circuit to heat the energy storage-radiation module 20, the energy storage-radiation module 20 is warmed to store energy; when the electric energy is insufficient, the heat insulation plug plate 53 is slid to make the conversion through hole on the heat insulation plug plate 53 communicate with the radiation heat exchange channel, so as to open the radiation heat exchange channel by means of the conversion through hole, and the thermoelectric conversion module 30 receives the energy of the energy storage-radiation module 20 and converts it into electric energy externally.

[0036] On the basis of the above technical solutions, further, the power generation system provided by the embodiment further comprises a heat equalizing plate 54, the heat equalizing plate 54 is installed in the inner shell 52, and the heat equalizing plate 54 is located above the energy storage-radiation module 20; and the side of the heat equalizing plate 54, which is away from the energy storage-radiation module 20, is covered with a selective emission coating. The heat equalizing plate 54 is made of a high-thermal-conductivity material, which can make the surface temperature of the selective emission coating (the spectral selective emission coating adopts a metal W coating, which ensures high thermal radiation at a wavelength less than 1800 nm, inhibits long-wave radiation at a wavelength greater than 1800 nm, and improves the thermal-electric conversion efficiency of the system) uniform, and prevents the reduction of the thermal photovoltaic conversion efficiency caused by spectral mismatch.

[0037] As a specific example, as shown in FIG. 4, Figure 1 The cooling module 40 in the application comprises a cooling plate 42, the cooling plate 42 is provided with a cooling cavity, the cooling cavity is communicated with a refrigerant inlet pipe and a refrigerant outlet pipe, and the thermoelectric conversion module 30 is installed on the cooling plate 42 to control the temperature of the thermoelectric conversion module 30 by means of refrigerant flow.

[0038] The energy storage-radiation module 20 in the application is preferably a high-specific-heat graphite material. Figure 2 a) Assuming that the charge-discharge heat cycle temperature of the system is 1000-1800℃, the energy density of the graphite sensible heat storage is 1035kWh / m 3 ( Figure 2 b) The thermal conductivity at 1500℃ is about 50W / (m·K). A circular ring-shaped heat storage module is constructed, the outer diameter is 75mm, the inner diameter is 25mm, and the height is 600mm. It can be found through theoretical calculation that the capacity of the module is about 12kWh, and it only takes 1.6 hours to be fully charged under a charging power of 30kW (which is comparable to the speed of a fast-charging charging pile on the market) Figure 2 c) The system can complete heat release in 16 hours Figure 2 d) By shortening the ratio of the height to the bottom diameter of the heat storage module, the heat release time of the system can be further reduced.

[0039] As can be seen from the above, based on the properties of the existing graphite material, such as high thermal conductivity (5-200W / (m·K)) and high specific heat capacity, the graphite can be used as a heat storage material in an energy storage-power generation system to improve the energy density, charging and discharging rate and output power of the energy storage system by heating the graphite to an ultra-high temperature, so as to realize the rapid storage and release of electric energy.

[0040] The above are only preferred embodiments of the application, and do not limit the implementation manners and protection scope of the application. It should be recognized by those skilled in the art that any equivalent replacement and obvious changes made according to the content of the specification and drawings should be included in the protection scope of the application.

Claims

1. An ultra-high temperature solid state sensible heat storage and thermal photovoltaic power generation system, characterized in that, The system comprises: a heating module; a storage-radiation module, which is highly heat-conductive, for receiving heat from the heating module to store energy and emit infrared radiation energy; a thermoelectric conversion module for receiving energy from the storage-radiation module and converting it into electric energy; a cooling module for cooling the thermoelectric conversion module; and a heat insulation module for maintaining ambient temperature, which comprises an outer shell, an inner shell, and a heat insulation plugboard, the inner shell is installed in the outer shell, the heat insulation plugboard is provided with a conversion through hole, the heat insulation plugboard is slidingly installed on the inner shell, the heating module, the storage-radiation module and the thermoelectric conversion module are installed in the inner shell, and the storage-radiation module and the thermoelectric conversion module have a radiation heat exchange channel therebetween. When there is excess electric energy, the heat insulation plugboard slides to close the radiation heat exchange channel, the heating module is connected to a circuit to heat to a high temperature, and the storage-radiation module is heated and stores energy; when there is insufficient electric energy, the heat insulation plugboard slides to open the radiation heat exchange channel through the conversion through hole, and the thermoelectric conversion module receives energy from the storage-radiation module and converts it into electric energy. The heat insulation module further comprises a heat spreading plate, which is installed in the inner shell, the heat spreading plate is located above the storage-radiation module, and one side of the heat spreading plate away from the storage-radiation module is covered with a selective emission coating.

2. The ultra-high temperature solid state sensible heat storage and thermal photovoltaic power generation system of claim 1, wherein, The heating module is a heating electrode.

3. The ultra-high temperature solid-state sensible heat storage and thermal photovoltaic power generation system according to claim 1 or 2, characterized in that, The storage-radiation module is made of a high-heat-conductive material.

4. The ultra-high temperature solid-state sensible heat storage and thermal photovoltaic power generation system according to claim 1 or 2, characterized in that, 5. The system according to claim 4, wherein the high-heat-conductive material is one or more of metal oxide, metal nitride, metal carbide, or graphite and composite materials thereof. The thermoelectric conversion module is a thermophotovoltaic.

6. The ultra-high-temperature solid-state sensible heat storage and thermal photovoltaic power generation system according to claim 1 or 2, characterized in that, The cooling module comprises a cooling plate, the cooling plate is provided with a cooling cavity, the cooling cavity is in communication with a coolant inlet pipe and a coolant outlet pipe, and the thermoelectric conversion module is installed on the cooling plate.

7. The ultra-high-temperature solid-state sensible heat storage and thermal photovoltaic power generation system according to claim 1 or 2, characterized in that, ​

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