Heat and electricity storage device utilizing temperature difference to generate electricity

Abstract

A heat and electricity storage device utilizing thermoelectric power generation belongs to the technical field of electricity storage equipment and comprises a PLC (programmable logic controller), raft equipment, a temperature detection module, a heat storage module, a heat preservation module, an inner shell, an outer shell, a power generation module, fin-shaped radiating fins and an electric heater. The multiple heat preservation modules are installed in the inner shell, the upper end heat preservation module is provided with a heat conduction groove, raft equipment is installed at the two side ends of the heat conduction groove, and the multiple heat storage modules are installed on the inner sides of the heat preservation modules respectively. The electric heaters are mounted in the plurality of heat storage modules; the inner shell is installed in the outer shell, the power generation modules are installed on the inner side of the outer shell, and the fin-shaped cooling fins are installed on the outer side of the outer shell. The device is relatively simple and compact in structure, low in cost and convenient to use, the electric heater can be switched on in a specific time period to heat the heat storage module, the power generation module can be controlled to supply power to the electrical load in the peak period of power utilization, the speed and effect of acting on the temperature of the heating surface of the thermal power generation module are improved through the fin-shaped cooling fins, and the power generation capacity is relatively improved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a thermal energy storage device that generates electricity using temperature difference. Background Technology

[0002] Currently, in the field of energy storage, lithium batteries are generally used as energy storage batteries to store excess photovoltaic power generation and power during off-peak hours of the grid, and release power during peak power supply periods to ensure that the power supply line can stably supply power to the load (or directly supply power to the load). However, due to structural limitations, lithium batteries as energy storage devices have the following disadvantages in application: (1) Lithium batteries cannot be over-discharged, otherwise their service life will be shortened, and there is a risk of explosion when the temperature is too high during the charging and discharging process; (2) The current cycle life of lithium batteries is about 8 years, which is relatively short. The application temperature is between -20 and 75°C, especially the low temperature performance is very poor (the charging and discharging capacity becomes worse at low temperatures), so the application environment is limited.

[0003] Thermal energy storage power generation, as a relatively novel power generation method, has the following advantages. (1) Thermal energy storage power generation has the ability to store large-scale energy and can be flexibly configured according to demand to adapt to different energy demand scenarios; (2) Compared with electrochemical energy storage and electrical energy storage, thermal energy storage power generation technology has obvious advantages in terms of installed capacity, energy storage density, technical cost and service life. In addition, the initial investment cost of thermal energy storage power generation is relatively low, and it can store thermal energy for a long time with little energy loss; (3) Thermal energy storage power generation technology occupies a small area and has little impact on the environment. It is not limited by geographical or environmental conditions. There is no chemical reaction during the storage process. The technical parameters and processes are controllable and the system is highly safe; (4) Thermal energy storage power generation technology can adapt to various energy grades and realize the combined supply of cooling, heating, electricity and steam to meet the needs of different users. In addition, thermal energy storage power generation can also perform peak shaving and valley filling and bidirectional regulation of the regional power grid and absorb intermittent new energy (such as wind power, photovoltaic, etc.). It is the best solution for the grid to balance the peak-valley difference; (5) Thermal energy storage power generation has a large number of cycles and a long lifespan. The bidirectional regulation function of the energy storage power station will not reduce efficiency due to long-term thermal energy storage cycles. While existing thermal energy storage power generation has many advantages over lithium-ion battery energy storage, it also has the following technical drawbacks due to its inherent functional limitations. Specifically, existing thermal energy storage power generation equipment is generally used in areas with large power loads, and its equipment structure is relatively complex and costly, making it unsuitable for small-scale applications with relatively low investment. Furthermore, during power generation, the heat released by the thermal storage module acts on the heated surface of the thermal power generation module (power generation module) through natural radiation, resulting in a relatively low rate and efficiency of heat release and relatively low power generation capacity. Utility Model Content

[0004] To overcome the shortcomings of existing thermal energy storage devices, which are limited by their structure and have the drawbacks described in the background art, this utility model provides a thermal energy storage device that utilizes temperature difference to generate electricity. This device has a relatively simple and compact structure, low cost, and is easy to use. It is suitable for use in various locations (different combinations of sets can be used as needed, suitable for areas with large or small power supply loads). When releasing heat, it can improve the heat dissipation capacity of the thermal energy storage module through finned heat sinks, thereby improving the speed and effect of the heat transfer to the heated surface of the thermal energy generation module and relatively improving the power generation capacity.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A thermal energy storage device utilizing thermoelectric power generation includes a PLC, a raft plate device, a temperature detection module, a thermal storage module, a heat insulation module, an inner shell, an outer shell, a power generation module, finned heat sinks, and an electric heater. The raft plate device includes a motor reduction mechanism, a raft plate, and a bearing housing. Multiple heat insulation modules, thermal storage modules, power generation modules, and finned heat sinks are included. Multiple heat insulation modules are installed inside the inner shell, with the upper heat insulation module having a heat conduction groove. The bearing housing and motor reduction mechanism are installed on opposite sides of the heat conduction groove. Multiple thermal storage modules are installed inside the heat insulation modules. The electric heater is installed inside the multiple thermal storage modules. The inner shell is installed inside the outer shell, and multiple power generation modules are installed inside the outer shell. The power output terminals of the multiple thermoelectric heating modules are electrically connected to the power input terminals of the electrical load. The multiple finned heat sinks are installed on the outer shell, and the probes of two sets of temperature detection modules are located inside the inner shell and the outer shell, respectively.

[0007] Furthermore, the inner shell, outer shell, and finned heat sink are made of metal.

[0008] Furthermore, the heat storage module is a magnesium brick, and the insulation module is a ceramic aluminosilicate brick.

[0009] Furthermore, the power generation module is a thermoelectric power generation module.

[0010] Furthermore, the distance between the heated surface of the thermoelectric power generation module and the outer end of the inner shell.

[0011] Furthermore, in the raft plate device, the bearing housing and the motor reduction mechanism are respectively installed on both sides of the heat conduction groove, one end of the raft plate is rotatably installed in the bearing housing, and the rotating shaft of the motor reduction mechanism is installed together with the other end of the raft plate.

[0012] Furthermore, the raft plate is made of metal and has an insulation layer installed on its front end.

[0013] Furthermore, the PLC can also be replaced by either a microcontroller module or a host computer.

[0014] Compared with the prior art, the advantages of this utility model are: the structure of this new model is relatively simple and compact, the cost is low, and it is easy to use. It is suitable for use in various places (different combinations of sets can be used as needed, suitable for areas with large or small power supply loads). Under the mature PLC signal receiving, processing and control, it can turn on the electric heater to heat the heat storage module during a specific time period (the low peak time of power consumption in the relevant power supply area), and control the power generation module to supply power to the power load during the peak power consumption period. Since the heat storage module can improve the heat dissipation capacity through the finned heat sink when releasing heat, the speed and effect of the temperature of the heated surface of the thermal power generation module are improved, and the power generation capacity is relatively improved. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model (excluding the outer shell and finned heat sink).

[0017] Figure 2 This is a schematic diagram of a partial planar structure of the present invention.

[0018] Figure 3 This is the circuit diagram of this utility model. Detailed Implementation

[0019] Figure 1 , 2 As shown in Figure 3, a thermal energy storage device for generating electricity using temperature difference includes a PLC, a raft plate device 1, temperature detection modules W1 and W2, a thermal storage module 2, a heat insulation module 3, an inner shell 4, an outer shell 5, a power generation module FD, finned heat sinks 6, and an electric heater RT. The raft plate device includes a motor reduction mechanism M (a 200W heat-resistant coaxial motor gear reducer) and a raft plate 101 and a bearing seat 102. The outer shell 5 and the inner shell 4 are rectangular hollow structures, with the upper end of the inner shell 4 being an open structure. Multiple heat insulation modules 3, thermal storage modules 2, power generation modules FD, and finned heat sinks 6 are present, and the multiple heat insulation modules 3 are respectively sealed and fixed. The inner shell 4 is installed at the lower, upper, front, back, left, and right ends. The upper insulation module 3 has a rectangular heat conduction groove 31 in the middle. The raft plate device 1 is installed on both sides of the heat conduction groove 31. Multiple heat storage modules 2 are respectively sealed and fixedly installed at the lower, upper, front, back, left, and right ends of the inner shell 3. The electric heater RT is sealed and fixedly installed in the hollow heating cavity composed of multiple heat storage modules 2. The inner shell 4 is fixedly installed inside the outer shell 5. Multiple power generation modules FD are seamlessly sealed and installed at the lower, upper, front, back, left, and right ends of the inner shell 5. Multiple finned heat sinks 6 are seamlessly fixedly installed at the upper and front, back, left, and right ends of the outer shell 5.

[0020] Figure 1 , 2As shown in Figures 3 and 4, the inner shell 4, outer shell 5, and finned heat sink 6 are made of steel and copper, respectively. The electric heater RT is a finished stainless steel armored dry-burning electric heating tube, the heat storage module 2 is magnesium brick, and the insulation module 3 is ceramic aluminosilicate brick. The power generation module FD is a thermoelectric power generation module (6V) of model SP1848-27145, and the heating surface of the thermoelectric power generation module FD is located on the inner end of the outer shell 5. The distance between the heating surface of the thermoelectric power generation module FD and the outer end of the inner shell 4 serves as the heat flow channel 7. The two temperature detection modules W1 and W2 (analog temperature and humidity sensors of model AM1011A) have two power input terminals and one signal output terminal, and the PLC model is Siemens PLC industrial control board SMART200. In the raft plate equipment, the bearing housing 102 and the motor reduction mechanism M are fixedly installed on the left and right sides of the rear end of the heat conduction groove 31, respectively. A shaft is welded to each of the two rear ends of the raft plate 101. The left shaft is tightly fitted into the inner ring of the bearing in the bearing housing 102. The left end of the rotating shaft of the motor reduction mechanism M is welded to the right end of the shaft of the raft plate 101. When the raft plate 101 is in a horizontal structure facing forward, the lower end of the raft plate 101 completely seals the heat conduction groove 31. The raft plate 101 is made of metal and has a heat insulation layer fixedly installed on its front end to provide heat preservation (such as a glass wool layer or an aluminum silicate wool layer). The front ends of the temperature control probes 8 of the two temperature detection modules are located on the upper right side inside the heating cavity and the upper right end inside the outer shell 5, respectively. The wires connected to the electric heater RT and the temperature control probes 8 of the two temperature detection modules are sleeved in multiple insulating ceramic tubes and then led out from the side openings of one of the heat storage modules 2, the heat preservation module 3, and the inner shell 4 (the openings are sealed with heat-resistant sealant). A PLC can also be replaced by either a microcontroller module or a host computer.

[0021] Figure 1 , 2 As shown in Figure 3, the power input terminals 1 and 2 of the two temperature detection modules W1 and W2, the power input terminal of the PLC, and the two poles of the 220V AC power supply are connected by wires. The signal output terminal 3 of the two temperature detection modules W1 and W2 and the signal input terminals 3 and 4 of the PLC are connected by wires. The power output terminals 5 and 6, and 7 and 8 of the PLC are connected by wires to the power input terminals of the motor reduction mechanism M and the electric heater RT, respectively. The control power input terminals 9 and 10 of the PLC are connected by wires to the power supply terminal (such as the power output from the photovoltaic panel or power line). The power output terminals of multiple temperature difference heating modules FD are connected to the electrical load (such as the power input terminal of the power inverter connected by wires, and the power output terminal of the power inverter connected to the power input terminal of the electrical load connected by wires) through parallel or series connection by wires. The two temperature detection modules W1 and W2 and the PLC are installed in the electrical control box.

[0022] Figure 1 , 2As shown in Figure 3, existing thermal energy storage power generation equipment is generally used in areas with large power loads. Its structure is relatively complex and costly, making it unsuitable for small-scale, low-investment power consumption areas. This new type of equipment has a simpler, more compact structure, lower cost, and is easier to use, making it suitable for various locations (different combinations of sets can be used as needed, suitable for areas with large or small power loads). After the PLC is powered on, its internal circuitry activates the power supply to heat the electric heater during specific time periods (off-peak periods in the relevant power supply area). The electric heater RT heats up to heat the thermal storage module 2 (the insulation module 3 can insulate the thermal storage module 2, improving its insulation capacity). When the temperature inside the heating chamber is below a certain level (e.g., below 130°C), the temperature voltage signal output by the temperature detection module W1 enters the first signal input terminal of the PLC. The PLC then controls the power supply to enter the power input terminal of the electric heater RT, and the electric heater RT continues to be powered to heat the thermal storage module 2. When the temperature inside the heating chamber is above a certain level (e.g., above 130°C), the PLC controls the power supply to enter the power input terminal of the electric heater RT. The electric heater RT continues to be powered to heat the thermal storage module 2. When the temperature voltage signal output by the temperature detection module W1 enters the first signal input terminal of the PLC (30℃), the PLC stops outputting power to the power input terminal of the electric heater RT, and the electric heater RT no longer receives power to heat the heat storage module 2. Through the above, this new invention can heat the heat storage module within a specific time period and ensure that the heat storage module can be kept at a constant temperature, preventing insufficient heat storage capacity due to excessively low temperature and abnormal operation of the heat storage module due to excessively high temperature (such as excessively high temperature, which may cause deformation of the heat storage module).During peak electricity consumption periods, the PLC, through its internal circuitry, connects the positive and negative power input terminals of the motor reduction mechanism M. The rotating shaft of the motor reduction mechanism M drives the valve plate 101 to rotate to a near-vertical position. This allows the heat emitted from the multiple heat storage modules 2 within the hollow heating cavity to gradually enter the heat flow channel between the inner and outer shells. This heat acts on the heated surfaces of the multiple power generation modules FD, thus generating electricity to power the load. Specifically, when the heat output from the heat storage modules exceeds a certain temperature (e.g., above 110°C), the temperature signal output by the temperature detection module W2 enters the second signal input terminal of the PLC. The PLC then controls the positive and negative power input terminals of the motor reduction mechanism M to be energized, and the motor reduction mechanism... The rotating shaft of M will cause the valve plate 101 to rotate forward by a certain angle. In this way, the raft plate 101 will partially block the heat conduction groove 31, and the heat output from the heat storage module to the multiple power generation modules FD will be relatively low, preventing the power generation modules FD from malfunctioning due to excessive temperature. When the heat output of the heat storage module is lower than a certain level (e.g., below 110℃), when the temperature signal output by the temperature detection module W2 enters the second signal input terminal of the PLC, the positive and negative power input terminals of the motor reduction mechanism M controlled by the PLC will be energized. The rotating shaft of the motor reduction mechanism M will cause the valve plate 101 to rotate backward by a certain angle. In this way, the heat conduction groove 31 of the raft plate 101 will be partially blocked, and the heat output from the heat storage module to the multiple power generation modules FD will be relatively high, preventing the power generation modules FD from malfunctioning due to excessive temperature.

[0023] Figure 1 , 2 As shown in Figure 3, through the above-described process, this novel device, under the mature PLC signal receiving, processing, and control capabilities, can connect the electric heater to heat the heat storage module during specific time periods (off-peak electricity consumption periods in the relevant power supply area), and control the power generation module to supply power to the load during peak electricity consumption periods. Because the heat dissipation capacity of the heat storage module is improved through the finned heat sink 6 during heat release, the speed and effect of the heat exchange on the FD heating surface of the thermal power generation module are correspondingly increased, thus relatively improving the power generation capacity. It should be noted that the PLC's timed control of the operation of relevant electrical equipment, as well as its receiving of signals from relevant equipment and timed control of the equipment's power supply according to the signals, is a very mature existing technology. This application does not provide any protection for the above technical solution, nor does it elaborate on its working principle.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0025] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A heat storage and power storage device using thermoelectric power generation, comprising a PLC, a raft device, a temperature detection module, a heat storage module, a heat preservation module, an inner shell, an outer shell, a power generation module, a fin-type heat sink, an electric heater, characterized in that, The raft device comprises a motor speed reduction mechanism and a raft, a bearing seat; the heat preservation module and the heat storage module, the power generation module, and the fin-shaped radiating fin are multiple, the multiple heat preservation modules are respectively installed inside the inner shell, the upper end heat preservation module is provided with a heat conduction groove, the bearing seat and the motor speed reduction mechanism are respectively installed at both sides of the heat conduction groove, and the multiple heat storage modules are respectively installed inside the heat preservation modules; the electric heater is installed inside the multiple heat storage modules; the inner shell is installed inside the outer shell, the multiple power generation modules are respectively installed inside the outer shell, the power output end of the multiple heat difference heating modules and the power input end of the power load are electrically connected; the multiple fin-shaped radiating fins are installed outside the outer shell, and the detection heads of the two sets of temperature detection modules are respectively located inside the inner shell and the outer shell.

2. The heat storage and power storage device utilizing thermoelectric generation according to claim 1, characterized by, The inner shell and the outer shell and the fin-shaped radiating fin are metal materials.

3. The heat storage and power storage device using thermoelectric generation according to claim 1, wherein The heat storage module is a magnesium brick, and the heat preservation module is a ceramic aluminum silicate brick.

4. The heat storage and power storage device using thermoelectric generation according to claim 1, wherein The power generation module is a heat difference power generation module.

5. The heat storage and power storage device utilizing thermoelectric generation according to claim 4, characterized by The heat difference power generation module is spaced apart from the outer side end of the inner shell.

6. The heat storage and power storage device using thermoelectric generation according to claim 1, wherein In the raft device, the bearing seat and the motor speed reduction mechanism are respectively installed at both sides of the heat conduction groove, one end of the raft is rotatably installed in the bearing seat, and the rotating shaft of the motor speed reduction mechanism and the other end of the raft are installed together.

7. The heat storage and power storage device utilizing thermoelectric generation according to claim 6, characterized by The raft is made of metal material, and an insulating layer is installed at the front side end of the raft.

8. The heat storage and power storage device using thermoelectric generation according to claim 1, wherein The PLC can also be replaced by one of a single-chip microcomputer module or an upper computer.

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