Double-source coupling type mobile solid heat storage device and method suitable for rural areas

Abstract

The invention discloses a double-source coupling type mobile solid heat storage device and method suitable for rural areas, and belongs to the technical field of heat energy storage and comprehensive energy utilization. The device comprises a heat preservation unit, a supporting unit, a heat storage unit and a heat charging and discharging system, modular design is adopted, a standardized container serves as a carrier, and rapid transportation and deployment are supported. The heat storage unit adopts a composite material with high density and high heat storage performance as a main body, a heat exchange finned tube and a resistance wire are arranged in the heat storage unit, heat is directly exchanged through a working medium and a heat storage body, and efficient heat charging and discharging integration is achieved. The three modes of electric heating heat energy input, direct heat energy input and double-source input are compatible during heat charging, the comprehensive energy efficiency is improved by optimizing energy utilization, and the risk that a working medium is overheated or vaporized is avoided through precise temperature control during heat release. The system is suitable for the scenes of waste heat utilization of a combined heat and power unit, industrial waste heat recovery, solar heat collection / terrestrial heat utilization, distributed renewable energy consumption and distributed clean heat supply.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal energy storage and comprehensive energy utilization, and in particular relates to a dual-source coupled mobile solid thermal storage device and method suitable for rural areas. Background Art

[0002] In recent years, industrial restructuring and improvements in production and living standards have driven a growing demand for heating in rural areas. However, given the lack of widespread access to heating networks in rural areas, achieving green and efficient heating in rural areas is a key issue that needs to be addressed in the energy sector.

[0003] Currently, there are three potential solutions to this problem: first, waste-to-energy plants, biomass power plants, and even coal-fired power plants deployed in rural areas can be used to achieve combined heat and power to provide heat to improve overall energy efficiency, or to recycle industrial waste heat; second, solar thermal / geothermal systems deployed in rural areas with abundant renewable energy reserves can be used to achieve direct green heating; third, in remote areas where the power grid is not widely available and close to concentrated renewable energy power generation, heat can be provided through the conversion of renewable green electricity into heat to improve the level of renewable energy consumption.

[0004] However, for the first solution, the primary method for providing heat through combined heat and power generation (CHP) from various power plants currently relies on mobile steam tankers, which directly transport low-pressure steam to heat users. This method releases steam directly to users during the heat release phase, resulting in a loss of circulating water in the power plant, requiring continuous replenishment of deoxygenated water to maintain normal operation. Furthermore, the storage tanks in mobile steam tankers are pressure vessels, necessitating specific safety measures and operational costs. Specific implementations of the second and third solutions for industrial waste heat scenarios have yet to be seen.

[0005] Solid thermal storage technology, with its advantages of high energy storage density, safe operation at normal pressure, stable and reliable operation, and relatively low cost, has become a key supporting technology for thermal storage and heating, showing broad application prospects in promoting green and efficient heating in rural areas. However, existing solid thermal storage devices are generally fixed installations, relying on concrete foundations, with large single-unit capacities (≥5MWh) and weights exceeding 20 tons. These devices struggle to meet road transport standards, have long deployment cycles, and suffer from poor mobility, complex construction, long construction cycles, and high initial investment. These make them difficult to apply to specialized environments requiring rapid deployment and frequent relocation, such as rural areas without heating pipelines, temporary construction sites, and field work sites.

[0006] Traditional solid thermal storage technologies generally utilize a multi-stage indirect heat exchange model, "solid-air-water," to release and transfer heat. This involves circulating fans driving air through the pores of the high-temperature thermal storage medium for primary heat exchange. The heated air then exchanges heat with circulating water via a heat exchanger for secondary heat exchange. In this heating mode, the thermal storage medium typically has a high porosity, resulting in a low heat storage density per unit volume, a long heat transfer path with high losses, and low overall heat transfer efficiency. Maintaining system circulation requires high-power fans, significantly increasing operating energy consumption. Furthermore, the circulating water is prone to vaporization during operation, creating pressure fluctuations and potential safety hazards, increasing system instability and complexity. Regarding heat charging methods, traditional solid thermal storage technologies primarily rely on electric heating with resistance wires. This monolithic structure makes it difficult to synergistically absorb and efficiently utilize multiple heat sources, such as industrial waste heat and waste heat. This limits the system's adaptability and energy efficiency potential under diversified energy input conditions. Furthermore, the limited modularity of existing systems makes it difficult to quickly and flexibly combine and scale them according to actual needs, severely hindering their widespread adoption and application in diverse application scenarios.

[0007] In summary, with the continuous adjustment of rural industrial structures and the continuous improvement of production and living standards, the demand for heating and heat storage in rural areas is growing. However, the industrial production process in townships and villages generates a large amount of power plant steam and high-temperature waste heat, but due to the lack of heating pipeline infrastructure and flexible heat storage technology, utilization is generally insufficient. At the same time, during the off-peak hours of the power grid, there is an excess of electricity. Traditional solid-state thermal storage equipment cannot efficiently couple off-peak electricity and waste heat resources, resulting in significant energy waste. To improve energy utilization and reduce energy waste in rural areas, the development of efficient multi-source heat storage equipment has become an urgent need. Summary of the Invention

[0008] The purpose of the present invention is to provide a dual-source coupled mobile solid heat storage device and method suitable for rural areas, so as to solve the problems of poor mobility, low heat exchange efficiency, single energy utilization, limited application scenarios and poor economy existing in the prior art.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: A dual-source coupled mobile solid thermal storage device suitable for rural areas, comprising a heat preservation unit, a support unit, a heat storage unit, and a heat charging and discharging system; The insulation unit adopts a multi-layer composite insulation layer with a box structure, the heat storage unit adopts a heat storage body, and the heat storage body is arranged in the multi-layer composite insulation layer. The support unit adopts a support body, and the support body is used to fix and support the heat storage body inside the multi-layer composite insulation layer. Several parallel channels are arranged inside the heat storage body. The heat charging and discharging system includes heat exchange fin tubes and resistance wires arranged in the channels. The heat exchange fin tubes in adjacent channels are arranged in an S shape. The inlet end of the heat exchange fin tube is connected to the heat exchange inlet pipe through the heat exchange inlet arranged on the multi-layer composite insulation layer, and the heat exchange inlet pipe is connected to the pump. The outlet end of the heat exchange fin tube is connected to the heat exchange outlet pipe through the heat exchange outlet arranged on the multi-layer composite insulation layer. One end of the resistance wire of each channel is gathered and connected to the controller through the terminal block arranged on the multi-layer composite insulation layer. A temperature control unit is also provided in the multi-layer composite insulation layer. The connecting line of the temperature control unit is connected to the controller through the terminal block, and the pump is connected to the controller.

[0010] Furthermore, the multi-layer composite thermal insulation layer includes a high-strength thermal insulation layer, an ultra-low thermal conductivity thermal insulation layer and a high-reflection layer arranged in sequence from the outside to the inside.

[0011] Furthermore, the temperature control unit adopts a temperature sensor, and the temperature sensor is covered with a protective cover of high-temperature resistant material.

[0012] Furthermore, the wiring seat and the controller are connected via wires, which are composed of a low-resistance data transmission line covered with a high-temperature resistant insulation layer and a resistance wire heating power line.

[0013] Furthermore, the heat exchange fin tube includes a heat exchange pipe and heat exchange fins on the outer wall of the heat exchange pipe.

[0014] Furthermore, the terminal block is provided with a data transmission interface for connecting to the temperature control unit and a power supply interface for connecting to the resistance wire.

[0015] A method for using a dual-source coupled mobile solid thermal storage device suitable for rural areas, including a heat charging process and a heat dissipation process; The heat charging process includes three modes: electric-to-heat heat input, direct heat input and dual-source input; In the electrical-to-heat energy input mode, the controller receives external grid signals and supplies power to the resistance wire. The resistance wire is embedded in the thermal storage channel, converting electrical energy into thermal energy and transferring the heat to the thermal storage body. The temperature control unit monitors the temperature of the thermal storage body in real time and adjusts the power of the resistance wire through the controller. When the temperature control unit detects that the thermal storage body temperature reaches the set value, the controller automatically cuts off the power supply. In direct heat input mode, the heat energy carrier of the heat source enters the heat exchange fin tube through the heat exchange inlet through the pump. The heat is transferred to the heat storage body through the heat exchange fin tube. The low-temperature carrier after heat exchange is discharged through the heat exchange outlet to the heat exchange outlet pipe and then sent to the heat source. At the same time, the controller dynamically adjusts the pump speed according to the inlet temperature and flow rate. In dual-source input mode, the controller coordinates the operating status of the resistance wire and the heat exchange fin tube, giving priority to using direct thermal energy for heating, and flexibly supplementing it with electric heat as an auxiliary heat source. When it detects that the external heat source is insufficient or the heat storage rate needs to be quickly increased, the electric heat power will be automatically increased to ensure heating efficiency. During the heat release process, the pump sends the cold working medium into the heat exchange inlet through the heat exchange inlet pipe. After the working medium enters the heat exchange finned tube, it directly exchanges heat with the heated heat storage body. The cold working medium absorbs the sensible heat of the heat storage body and is transported to the external heating network through the heat exchange outlet and the heat exchange outlet channel after heating. The entire heat exchange process is monitored by the temperature control unit and fed back to the controller to ensure stable heat output and avoid overheating or working medium vaporization.

[0016] A parallel heat storage system includes a plurality of single heat storage modules and a plurality of three-way flow control valves. The single heat storage modules adopt a dual-source coupled mobile solid heat storage device suitable for rural areas. The heat exchange inlet pipes of each single heat storage module are connected in parallel through multiple three-way flow control valves and then connected to the pump. The heat exchange outlet pipes of each single heat storage module are connected in parallel through multiple three-way flow control valves. The wiring sockets of each single heat storage module are connected in parallel through wires and then connected to the controller.

[0017] Furthermore, several individual heat storage modules are arranged in a container.

[0018] Furthermore, hydraulic support legs are provided at the bottom of the container.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention adopts an innovative dual-source heat charging and heat discharging integrated direct heat exchange technology. By designing heat exchange fin tubes inside the heat storage body, the heat charging and discharging systems share the same channel. During the heat charging process, for scenarios where heat energy such as waste heat from a combined heat and power unit, industrial waste heat, solar thermal energy / geothermal energy is directly input, the heat source is pumped into the heat exchange fin tubes in the form of steam or hot water, and heat is exchanged with the heat storage body to increase the temperature of the heat storage body; for scenarios where renewable energy is used for electric heating, electric energy is passed into the resistance wire arranged in the heat storage body to achieve the conversion of electric energy to thermal energy, and heat is exchanged with the heat storage body to increase the temperature of the heat storage body. During the heat dissipation process, the pump sends the cold working fluid into the heat exchange fin tubes, which is heated by the heat storage body at the operating temperature. After sufficient heat exchange, the hot working fluid is supplied to the heat user through the heat exchange outlet. This design realizes direct and efficient heat exchange between the cold working fluid and the heat storage body, avoiding the energy loss caused by the traditional multi-stage heat exchange mode, effectively improving the heat exchange efficiency and ensuring operational stability and safety. The heat dissipation system adopts precise temperature control to effectively control the temperature fluctuation of the working fluid and avoid the risk of vaporization.

[0020] In addition, the present invention uses standardized containers as carriers for modular integration design. The capacity of individual thermal storage modules can be flexibly adjusted to support road and rail transportation, and can be quickly deployed in various special scenarios such as rural areas without heating pipe networks, temporary construction sites, field construction, or emergency heating. The device does not require a fixed base, and is plug-and-play through hydraulic support legs and quick interfaces, greatly reducing the cost of transformation and deployment. Multiple individual thermal storage modules can be quickly integrated in parallel through pipes and circuits, with a simple structure and strong flexibility. The present invention can be flexibly combined and expanded according to actual needs to meet the application needs of different scales and diverse scenarios, significantly enhancing the industrialization potential and market application value of the technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 A schematic diagram of a dual-source coupled mobile solid thermal storage device suitable for rural areas; Figure 2 Schematic diagram of modular expansion of a single thermal storage device into a parallel thermal storage system.

[0023] Among them, 1. Multi-layer composite insulation layer; 2. Support body; 3. Heat storage body; 4. Heat exchange finned tube; 5. Resistance wire; 6. Temperature control unit; 7. Heat exchange inlet pipe; 8. Pump; 9. Electric wire; 10. Controller; 11. Heat exchange inlet; 12. Terminal block; 13. Heat exchange outlet; 14. Three-way flow control valve; 15. Heat exchange outlet pipe; 16. Container; 17. Hydraulic support legs. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] Example 1 The present invention is a mobile solid heat storage device suitable for rural areas, with a modular design, supporting dual-source input of electric heating energy and direct heat energy, and realizing direct heat exchange of cold working fluids. It is suitable for industrial waste heat utilization and waste heat recovery, solar energy collection / geothermal utilization, distributed renewable energy consumption and distributed clean heating scenarios.

[0027] It mainly includes a heat preservation unit, a support unit, a heat storage unit, a heat charging system and a heat release system. The heat preservation unit uses multiple layers of composite materials to form a multi-layer composite insulation layer; the support unit uses a metal frame structure to stabilize and fix the heat storage unit; the heat storage unit is mainly made of high-density, high-heat storage performance composite materials, and the heat storage body 3 has reserved holes for built-in resistance wires 5 and fin heat exchange tubes 4. The embedded resistance wire 5 is used to realize the electric heating heat energy input to the heat storage body, and the built-in fin heat exchange tube 4 is equipped with an efficient heat recovery to realize direct heat energy input to the heat storage body 3. The heat charging system supports three modes: electric heating heat energy input, direct heat energy input and dual-source input, and can operate intelligently and collaboratively to optimize energy costs. In the electric heating heat energy input or direct heat energy input mode, the resistance wire 5 and the fin heat exchange tube 4 are both arranged in parallel inside the heat storage body 3 to increase the heat exchange area and improve the heat exchange efficiency.

[0028] The device utilizes innovative dual-source direct heat exchange technology for both charging and discharging heat. By designing heat exchange finned tubes 4 within the heat storage body 3, the charging and discharging systems share a common channel. During the charging process, for scenarios where direct heat input comes from sources such as waste heat from a combined heat and power (CHP) unit, industrial waste heat, or solar thermal / geothermal heat, the heat source, in the form of steam or hot water, is pumped into the heat exchange finned tubes 4. This heat exchange occurs with the heat storage body 3 to raise its temperature. For renewable energy electric heating, electrical energy is fed into the resistance wire 5 within the heat storage body 3 to convert electrical energy into thermal energy, exchanging heat with the heat storage body 3 to raise its temperature. During the discharging process, a pump 8 delivers a cold working medium into the heat exchange finned tubes 4, where it is heated by the heat storage body 3 at its operating temperature. After sufficient heat exchange, the hot working medium is then supplied to the heat user via the heat exchange outlet 13. This design enables direct and efficient heat exchange between the cold working medium and the heat storage body 3, avoiding the energy losses associated with traditional multi-stage heat exchange methods. This effectively improves heat exchange efficiency and ensures operational stability and safety. The heat release system adopts precise temperature control to effectively control the temperature fluctuation of the working fluid and avoid the risk of vaporization.

[0029] In addition, the present invention uses standardized containers as carriers for modular integration design. The capacity of individual thermal storage modules can be flexibly adjusted to support road and rail transportation, and can be quickly deployed in various special scenarios such as rural areas without heating pipe networks, temporary construction sites, field construction, or emergency heating. The device does not require a fixed base and is plug-and-play through hydraulic support and quick interfaces, greatly reducing the cost of transformation and deployment. Multiple individual thermal storage modules can be quickly integrated in parallel through pipes and circuits, with a simple structure and strong flexibility. The present invention can be flexibly combined and expanded according to actual needs to meet the application needs of different scales and diverse scenarios, significantly enhancing the industrialization potential and market application value of the technology.

[0030] The present invention not only has the dual-source energy input capability of direct utilization of heat and power unit heat, industrial waste heat recovery heat, solar thermal collection / geothermal heat, and renewable energy power-to-heat conversion, but also has the advantages of efficient heat exchange and convenient mobility. It can effectively solve the bottleneck problem of current mobile heat storage technology, has important practical significance for promoting the progress of green and efficient rural heating technology, and has broad market application prospects.

[0031] Example 2 Reference Figure 1The following is a schematic diagram of a dual-source coupled mobile solid thermal storage device suitable for rural areas, detailing its operating principle. The thermal storage device primarily consists of a thermal insulation unit, a support unit, a thermal storage unit, a heat charging system, and a heat release system. The thermal insulation unit comprises a multi-layer composite thermal insulation layer 1, which, from the outside to the inside, consists of a high-strength thermal insulation layer, an ultra-low thermal conductivity thermal insulation layer, and a high-reflection layer. Specifically, the high-strength thermal insulation layer utilizes a ceramic fiber layer, the ultra-low thermal conductivity thermal insulation layer utilizes nano-aerogel, and the high-reflection layer utilizes an aluminum foil reflective layer. The overall thermal insulation efficiency can reach over 97%, minimizing heat loss. The support unit, support body 2, utilizes a high-strength, heat-resistant metal frame structure that supports the thermal storage unit, providing overall structural stability and deformation resistance. Specifically, the high-strength, heat-resistant metal frame is made of 310S stainless steel. The thermal storage unit, thermal storage body 3, is constructed from a high-performance solid composite material with excellent thermal capacity and thermal conductivity. It can efficiently store and release heat over a wide temperature range and adapt to multiple thermal cycles. Specifically, the high-performance solid composite material utilizes MgO-Al2O3 composite magnesium bricks. The heat charging and discharging systems (i.e., the heat charging system and the heat dissipation system) are composed of heat exchange fin tubes 4, resistance wires 5, temperature control units 6, heat exchange inlet pipes 7, pumps 8, wires 9, controllers 10, heat exchange inlets 11, terminal blocks 12, heat exchange outlets 13, and heat exchange outlet pipes 15. Among them, the heat exchange fin tubes 4 use heat exchange pipes with excellent high-temperature resistance and high thermal conductivity (made of Inconel 625 nickel-based alloy), and the outer wall of the tube is welded with reinforced heat exchange spiral fins to increase the heat exchange area with the heat storage body 3; the resistance wire 5 uses an integrated high-efficiency resistance heating element, combined with an insulating protective layer to ensure safe and stable electric heat conversion. Specifically, the resistance wire 5 uses a spiral resistance heating element, made of Cr20Ni80 iron-chromium-aluminum alloy and coated with high-purity alumina slurry as an insulating layer; the temperature control unit 6 uses a high-sensitivity K-type thermocouple temperature sensor, covered with a high-temperature resistant material protective cover; the heat exchange inlet pipe 7, the heat exchange inlet 11, the heat exchange outlet 13 and the heat exchange outlet pipe 15 are all made of resistant It is made of high-temperature, corrosion-resistant and high-strength materials (310S stainless steel) and is equipped with standardized interfaces; the pump 8 is a high-temperature resistant centrifugal pump to drive the hot working medium or the cold working medium for heat exchange circulation; the wire 9 consists of a low-resistance data transmission line covered with a high-temperature resistant insulation layer and a resistance wire heating power line, which has good thermal stability and electrical performance, ensuring safe transmission and efficient power supply of the system under high temperature conditions; the controller 10 has a human-machine exchange interface, which can monitor and adjust the temperature, flow and other parameters of the heat storage device in real time; the terminal block 12 is equipped with a data transmission interface for connecting the sensor and a power interface for the resistance wire.

[0032] The main working principle of the dual-source coupled mobile solid heat storage device suitable for rural areas of the present invention is described as follows: the working process is divided into charging and releasing processes, and there are three modes in the charging process: electric heat conversion heat energy input, direct heat energy input and dual-source input.

[0033] In the electrical-to-heat energy input mode, the controller 10 receives signals from the external power grid and supplies power to the resistor 5 via the high-voltage power line 9. The resistor 5, embedded in the holes of the thermal storage element 3, converts electrical energy into heat through the Joule effect. The resistor 5 rapidly heats up and transfers heat to the thermal storage element 3, evenly distributing the heat within the thermal storage element 3 to maximize thermal energy storage efficiency. During this time, the heat exchange finned tubes 4 are idle, and the pump 8 is stopped. The temperature control unit 6 monitors the temperature of the thermal storage element 3 in real time and adjusts the power to the resistor 5 through the controller 10. When the temperature control unit 6 detects that the temperature of the thermal storage element 3 reaches the set value, the controller 10 automatically shuts off the power to ensure the safety and stability of the thermal charging process.

[0034] In direct heat input mode, the resistor 5 is idle. Various heat sources, such as waste heat from the combined heat and power (CHP) unit, industrial waste heat, solar thermal energy, and geothermal energy, are fed in the form of steam or hot water via pump 8 through heat inlet 11 and into the heat exchange finned tubes 4. Heat is then transferred to the thermal storage body 3 via the reinforced fins of the heat exchange finned tubes 4 through radiation and convection, efficiently storing the heat energy there. The low-temperature fluid, after heat exchange, is discharged through heat outlet 13 to heat outlet pipe 15 and then fed back to the heat source, awaiting secondary recharging in the heat charging system. Simultaneously, the controller 10 dynamically adjusts the speed of pump 8 based on inlet temperature and flow rate to ensure efficient heat exchange.

[0035] In dual-source input mode, the device can synchronously couple electric heating and direct thermal energy sources to achieve efficient and coordinated utilization of thermal energy and electric energy. Under normal operating conditions, the controller 10 intelligently coordinates the operating status of the resistance wire 5 and the heat exchange fin tube 4, giving priority to using direct thermal energy for heating, and flexibly supplementing electric heating as an auxiliary heat source. When it is detected that the external heat source supply is insufficient or the heat storage rate needs to be quickly increased, the electric heating power will be automatically increased to ensure heating efficiency. Especially in low temperature environments or high load demand periods, the electric heating power output can be dynamically adjusted to ensure heating stability. This dual-source input mode significantly improves the comprehensive energy utilization efficiency while effectively reducing operating costs.

[0036] During the heat release process, pump 8 delivers the cold working fluid through heat exchange inlet pipe 7 to heat exchange inlet 11. After entering heat exchange finned tubes 4, the working fluid directly exchanges heat with the heated thermal storage body 3. The cold working fluid rapidly absorbs the sensible heat of the thermal storage body 3 and, after heating, is delivered to the external heating network through heat exchange outlet 13 and heat exchange outlet channel 15. The entire heat exchange process is monitored by temperature control unit 6 and fed back to controller 10, ensuring stable heat output, preventing overheating or working fluid vaporization, and improving system safety and heat exchange efficiency.

[0037] Example 3 See also Figure 2The present invention provides a schematic diagram of a modular expansion of a single thermal storage device into a parallel thermal storage system. The system is composed of multiple single thermal storage modules (i.e., dual-source coupled mobile solid thermal storage devices suitable for rural areas), multiple three-way flow control valves 14, and a standardized container 16 packaging structure with hydraulic support legs 17. The heat exchange inlet pipes 7 of each single thermal storage module are connected in parallel via multiple three-way flow control valves 14, the heat exchange outlet pipes 15 of each single thermal storage module are connected in parallel via multiple three-way flow control valves 14, and the terminal blocks 12 of each single thermal storage module are connected in parallel via wires 9. Each single thermal storage module shares a pump 8 and a controller 10. The container 16 packaging design used in the modular expansion parallel thermal storage system enhances the mobility of the parallel thermal storage system, supporting road and rail transportation and rapid deployment. The use of hydraulic support legs 17 enhances stability in different environmental environments. In addition, the operation of the modular expansion parallel thermal storage system can refer to the operating principle of a single single thermal storage module.

[0038] The above is only an illustration of the embodiments of the present invention, but it cannot serve as the entire protection scope of the present invention. Equivalent changes or modifications or proportional enlargement or reduction made according to the design spirit of the present invention should all be considered to fall within the protection scope of the present invention.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A dual-source coupled mobile solid thermal storage device suitable for rural areas, characterized by: It includes a heat preservation unit, a support unit, a heat storage unit and a heat charging and discharging system; The heat-insulating unit adopts a multi-layer composite heat-insulating layer (1) of a box structure, the heat-storage unit adopts a heat-storage body (3), the heat-storage body (3) is arranged in the multi-layer composite heat-insulating layer (1), the support unit adopts a support body (2), the support body (2) is used to fix and support the heat-storage body (3) in the multi-layer composite heat-insulating layer (1), a plurality of parallel channels are arranged in the heat-storage body (3), the heat-charging and discharging system comprises heat-exchanging finned tubes (4) and resistance wires (5) arranged in the channels, the heat-exchanging finned tubes (4) in adjacent channels are arranged in an S-shape, the inlet end of the heat-exchanging finned tube (4) is connected to the heat-exchanging finned tube (4) by a heat-exchanging finned tube (4) arranged on the multi-layer composite heat-insulating layer (1), and the heat-exchanging finned tube (4) is connected to the heat-exchanging finned tube (4) by a heat-exchanging finned tube (4) arranged on the multi-layer composite heat-insulating layer (1). The heat inlet (11) is connected to the heat exchange inlet pipe (7), the heat exchange inlet pipe (7) is connected to the pump (8), the outlet end of the heat exchange fin tube (4) is connected to the heat exchange outlet pipe (15) via the heat exchange outlet (13) provided on the multi-layer composite thermal insulation layer (1), one end of the resistance wire (5) of each channel is connected to the controller (10) via the terminal block (12) provided on the multi-layer composite thermal insulation layer (1), a temperature control unit (6) is further provided in the multi-layer composite thermal insulation layer (1), and the connecting wire of the temperature control unit (6) is connected to the controller (10) via the terminal block (12), and the pump (8) is connected to the controller (10).

2. The dual-source coupled mobile solid thermal storage device suitable for rural areas according to claim 1 is characterized in that: The multi-layer composite thermal insulation layer (1) comprises a high-strength thermal insulation layer, an ultra-low thermal conductivity thermal insulation layer and a high-reflection layer, which are sequentially arranged from the outside to the inside.

3. The dual-source coupled mobile solid thermal storage device suitable for rural areas according to claim 1, characterized in that: The temperature control unit (6) adopts a temperature sensor, and the temperature sensor is covered with a protective cover made of high-temperature resistant material.

4. The dual-source coupled mobile solid thermal storage device suitable for rural areas according to claim 1, characterized in that: The wiring seat (12) and the controller (10) are connected via an electric wire (9), and the electric wire (9) is composed of a low-resistance data transmission line covered with a high-temperature resistant insulation layer and a resistance wire heating power line.

5. The dual-source coupled mobile solid thermal storage device suitable for rural areas according to claim 1, characterized in that: The heat exchange fin tube (4) comprises a heat exchange pipe and heat exchange fins on the outer wall of the heat exchange pipe.

6. The dual-source coupled mobile solid thermal storage device suitable for rural areas according to claim 1, characterized in that: The terminal block (12) is provided with a data transmission interface for connecting to the temperature control unit (6) and a power supply interface for connecting to the resistance wire (5).

7. The method for using the dual-source coupled mobile solid thermal storage device suitable for rural areas according to any one of claims 1 to 6, characterized in that: Including heat charging process and heat releasing process; The heat charging process includes three modes: electric-to-heat heat input, direct heat input and dual-source input; In the electric-to-heat heat energy input mode, the controller (10) receives an external grid signal and supplies power to the resistance wire (5). The resistance wire (5) is embedded in the channel of the heat storage body (3), converts the electric energy into heat energy, and transfers the heat to the heat storage body (3). The temperature control unit (6) monitors the temperature of the heat storage body (3) in real time and adjusts the power of the resistance wire (5) through the controller (10). When the temperature control unit (6) detects that the temperature of the heat storage body (3) reaches the set value, the controller (10) automatically cuts off the power supply. In the direct heat energy input mode, the heat energy carrier of the heat source enters the heat exchange fin tube (4) through the heat exchange inlet (11) through the pump (8), and the heat is transferred to the heat storage body (3) through the heat exchange fin tube (4). The low-temperature carrier after heat exchange is discharged to the heat exchange outlet pipe (15) through the heat exchange outlet (13) and then sent to the heat source. At the same time, the controller (10) dynamically adjusts the speed of the pump (8) according to the inlet temperature and flow rate; In the dual-source input mode, the controller (10) coordinates the operating states of the resistance wire (5) and the heat exchange fin tube (4), giving priority to using direct heat energy for heat charging, and flexibly supplementing the electric heat conversion as an auxiliary heat source. When it is detected that the external heat source supply is insufficient or the heat storage rate needs to be quickly increased, the electric heat conversion power will be automatically increased to ensure the heat charging efficiency; During the heat release process, the pump (8) delivers the cold working medium to the heat exchange inlet (11) through the heat exchange inlet pipe (7). After the working medium enters the heat exchange fin tube (4), it directly exchanges heat with the heated heat storage body (3). The cold working medium absorbs the sensible heat of the heat storage body (3) and is transported to the external heating network through the heat exchange outlet (13) and the heat exchange outlet channel (15) after being heated. The entire heat exchange process is monitored by the temperature control unit (6) and fed back to the controller (10) to ensure stable heat output and avoid overheating or working medium vaporization.

8. A parallel heat storage system, characterized in that: It comprises a plurality of single heat storage modules and a plurality of three-way flow control valves (14), wherein the single heat storage modules adopt the dual-source coupled mobile solid heat storage device suitable for rural areas as claimed in any one of claims 1 to 6; The heat exchange inlet pipes (7) of each individual heat storage module are connected in parallel through a plurality of three-way flow control valves (14) and then connected to the pump (8); the heat exchange outlet pipes (15) of each individual heat storage module are connected in parallel through a plurality of three-way flow control valves (14); and the wiring sockets (12) of each individual heat storage module are connected in parallel through electric wires (9) and then connected to the controller (10).

9. The parallel heat storage system according to claim 8, characterized in that: Several single thermal storage modules are arranged in a container (16).

10. The parallel heat storage system according to claim 9, characterized in that: The bottom of the container (16) is provided with hydraulic support legs (17).

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