Thermal energy storage power generation system

Abstract

A kind of heat storage energy power generation system, including heat storage device and stirling engine, the main shaft transmission output of stirling engine is connected generator, and intelligent general control system is associated with control above-mentioned each device, several parallel power shafts are arranged in stirling engine, and one power cylinder is connected at the both ends of each power shaft, power shaft is driven connection main shaft by respective corresponding crank mechanism, two power cylinders on the same power shaft are respectively connected with the both ends of corresponding heating cylinder by gas pipeline, and the inner chamber of heating cylinder is divided into two variable chambers by moving partition and constitutes gas alternate reciprocating mechanism, and each heating cylinder is heated by heat storage device.The utility model has the advantages of reasonable structure, power cylinder is connected at the both ends of power shaft, action stroke is not idle, and the efficiency of work is high, the working phase of crank mechanism of different power shafts can be staggered, to ensure that main shaft has no dead point, and rotation output is more stable and continuous.The number of power cylinder can be adjusted conveniently by intelligent control work, and output power generation power is adjusted.

Description

Technical Field

[0001] This utility model relates to an energy storage power generation technology, and in particular to a device system that converts thermal energy storage into electrical energy. Background Technology

[0002] The output of clean energy sources such as wind and solar power is often unstable and highly volatile, making them unsuitable for direct grid connection. Energy storage systems are typically required to accommodate this demand. Furthermore, during periods of low grid load and lower electricity prices, energy storage systems can store electricity and release it during peak hours to balance the load and reduce operating costs. Currently, energy storage methods include mechanical, chemical, and thermal energy storage, among others. Thermal energy storage, with its lower site selection requirements and higher safety, is increasingly being used.

[0003] Conventional thermal energy storage power generation systems first convert electrical energy into heat energy, storing it in a thermal storage device. When output is needed, the heat energy heats the working gas medium of a Stirling engine, driving the Stirling engine to operate, which in turn drives a generator to output electrical energy again. However, the efficiency of a typical Stirling engine for power generation is not ideal, and its power output is difficult to adjust. Furthermore, energy storage power generation has diverse power requirements, and the output demand may vary at different times. Existing thermal energy storage power generation systems cannot yet meet all practical application requirements. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a thermal energy storage power generation system with a reasonable structure and convenient power output adjustment.

[0005] This utility model includes a heat storage device for electric heating and energy storage, and a Stirling engine whose working medium is compressed air. The main shaft drive output of the Stirling engine is connected to a generator. An intelligent control system is associated with and controls the above-mentioned devices. The Stirling engine has several parallel power shafts arranged in it. Each power shaft has a power cylinder connected to both ends. The power shaft is connected to the main shaft through its corresponding crankshaft mechanism. The two power cylinders on the same power shaft are respectively connected to the two ends of the corresponding heating cylinder by gas pipelines. The inner cavity of the heating cylinder is divided into two variable chambers by a movable partition to form a gas alternating reciprocating mechanism. Each heating cylinder is heated by the heat storage device.

[0006] This invention features a rational structure, with power cylinders connected to both ends of the power shaft, ensuring no idle stroke. The symmetrical alternating operation of the coaxial power cylinders maximizes efficiency, and the crankshaft mechanisms of different power shafts can be staggered in their working phases, ensuring no dead spots on the main shaft and resulting in smoother and more continuous rotational output. Intelligent control of the number of operating power cylinders allows for convenient adjustment of the output power. Furthermore, the main components of this invention are mechanical devices, ensuring high reliability, a small footprint, energy efficiency, and environmental friendliness, thus helping to reduce the user's overall electricity costs.

[0007] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0008] Figure 1 This is a main schematic diagram of an embodiment.

[0009] Figure 2 yes Figure 1 Top view.

[0010] Figure 3 yes Figure 1 A partial schematic diagram of the AA section.

[0011] Figure 4 This is a three-dimensional schematic diagram of the heat storage device on one side of the embodiment, which is hidden.

[0012] Figure 5 yes Figure 4 A partial schematic diagram of the BB cross-section. Detailed Implementation

[0013] like Figures 1 to 5 As shown, the heat storage device 1 uses electric heating for energy storage, the working medium of the Stirling engine 2 is compressed air, the main shaft 5 of the Stirling engine 2 is connected to the generator 3 for transmission output, and the intelligent control system 4 is associated with and controls the above-mentioned devices. Several parallel power shafts 6 are arranged in the Stirling engine 2, and each power shaft 6 has a power cylinder 7 connected to both ends. The power shafts 6 are connected to the main shaft 5 through their respective crankshaft mechanisms 8. Two power cylinders 7 on the same power shaft 6 are respectively connected to the two ends of a corresponding heating cylinder 9 via gas pipelines. The inner cavity of the heating cylinder 9 is divided into two variable chambers by a movable partition 10, forming a gas alternating reciprocating mechanism. Each heating cylinder 9 is heated by the heat storage device 1.

[0014] In practice, the main shaft 5 of the Stirling engine 2 is generally arranged horizontally, while the direction of each power shaft 6 is vertical, and there is an even number of power shafts 6, symmetrically distributed on both sides of the main shaft 5. In this embodiment, there are eight power shafts 6, four on each side of the main shaft 5. Since each heating cylinder 9 is correspondingly distributed on both sides, there are also two heat storage devices 1 in this embodiment, distributed on both sides. Each heating cylinder 9 is built into the heat storage device 1 on the corresponding side, and the heat storage device 1 supplies heat to the heating cylinder 9 through hot air conduction. In this embodiment, every two adjacent power shafts 6 are used as a synchronization unit, and the gas pipeline of each power cylinder 7 on the synchronization unit is connected to a heating cylinder 9, that is, the heat storage device 1 on both sides has two heating cylinders 9 built into it. In addition, a regenerator 12 is generally connected in the gas pipeline between the power cylinder 7 and the heating cylinder 9, so that the hot air can be recovered when it passes through, which helps to improve the thermal efficiency of the system.

[0015] During energy storage, external electrical energy is used as the energy source, and electric heating is employed to heat the thermal storage device 1. Solid iron-based alloys are generally used as the thermal storage medium due to their large heat capacity and ease of production and assembly. When power generation is required, the thermal storage device 1 supplies heat to the heating cylinder 9 via hot air conduction. The compressed air inside the heating cylinder 9 heats up, expands, and flows. The moving partition 10 alternately changes the volume of the two variable chambers inside the heating cylinder 9. The corresponding power cylinders 7 at both ends of the heating cylinder 9 alternately push and pull to coordinate the movement of the corresponding power shafts 6, which in turn drive the main shaft 5 through the corresponding crankshaft mechanism 8. The Stirling engine 2 then drives the generator 3 to generate electricity.

[0016] Through the command control of the intelligent control system 4, the movement positions of the power shafts 6 of different units are asynchronous, meaning that the corresponding crankshaft mechanisms 8 have different working phases. This ensures that the main shaft 5 has no dead points, resulting in a smoother and more continuous output. In fact, with a certain margin in the length of the main shaft 5, the power of the Stirling engine 2 can be easily increased by adding more power shafts 6. If low-power operation is temporarily required, the number of working power cylinders 7 can be reduced through the command control of the intelligent control system 4, allowing for easy adjustment of the output power generation.

[0017] In this embodiment, a gas storage device 11 capable of storing sufficient compressed air is arranged next to the Stirling engine 2 and connected to the gas pipelines of each power cylinder 7. The gas storage device 11 is also linked and controlled by the intelligent central control system 4, forming a rapid engine output enhancement mechanism. Since the Stirling engine 2 requires a certain amount of time to warm up and start, when a rapid start-up response is needed, the compressed air in the gas storage device 11 can be quickly input into each power cylinder 7 under the control of the intelligent central control system 4. The power cylinders 7 can work quickly using the gas pressure difference, and the Stirling engine 2 can quickly return to normal operation. If necessary, with a rapid and sufficient supply of compressed air, the Stirling engine 2 can also operate at overpower for a short period of time to cope with load peaks.

Claims

1. A thermal energy storage power generation system, comprising a thermal storage device for electrically heated energy storage and a Stirling engine whose working medium is compressed air, wherein the main shaft drive output of the Stirling engine is connected to a generator, and an intelligent central control system is configured to control the aforementioned thermal storage device, Stirling engine, and generator, characterized in that: The Stirling engine (2) has several parallel power shafts (6). Each power shaft (6) has a power cylinder (7) connected to both ends. The power shaft (6) is connected to the main shaft (5) through its corresponding crankshaft mechanism (8). The two power cylinders (7) on the same power shaft (6) are connected to the two ends of the corresponding heating cylinder (9) through gas pipelines. The inner cavity of the heating cylinder (9) is divided into two variable chambers by a movable partition (10) to form a gas alternating reciprocating mechanism. Each heating cylinder (9) is heated by a heat storage device (1).

2. The thermal energy storage power generation system according to claim 1, characterized in that: The main shaft (5) of the Stirling engine (2) is arranged horizontally, and the direction of each power shaft (6) is vertical. There is an even number of power shafts (6), which are symmetrically distributed on both sides of the main shaft (5).

3. The thermal energy storage power generation system according to claim 1 or 2, characterized in that: Each heating cylinder (9) is built into the heat storage device (1), and the heat storage device (1) supplies heat to the heating cylinder (9) through hot air conduction.

4. The thermal energy storage power generation system according to claim 1 or 2, characterized in that: it can... An air storage device (11) that stores sufficient compressed air is connected to the gas pipeline of each power cylinder (7). The air storage device (11) is also associated with the intelligent control system (4) for control, forming a rapid engine output enhancement mechanism.

5. The thermal energy storage power generation system according to claim 3, characterized in that: it can... An air storage device (11) that stores sufficient compressed air is connected to the gas pipeline of each power cylinder (7). The air storage device (11) is also associated with the intelligent control system (4) for control, forming a rapid engine output enhancement mechanism.

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