Manual chamber compressed air energy storage device

Abstract

The invention discloses an artificial chamber compressed air energy storage device, which relates to the technical field of chamber compressed air energy storage and comprises an underground artificial chamber air storage system, a reinforced concrete chamber excavated manually and a flexible airtight layer covered on the inner wall. The non-afterburning high-temperature adiabatic compressor unit is used for compressing air to 8-15MPa through a multi-stage centrifugal compressor and inputting the air into the chamber; the compression heat recovery system comprises a spiral coil heat exchanger and a high-temperature heat storage tank; and the expansion generator set comprises a turbine and a generator, an air inlet of the turbine is connected with the high-temperature heat storage tank through a reheating pipeline, and an exhaust port of the turbine is communicated to the chamber through a power generation pipeline. The artificial reinforced concrete chamber is adopted to replace a natural salt cavern, geographical adaptability breakthrough and non-afterburning design are combined with high-temperature adiabatic compression, so that the energy efficiency is remarkably improved, the compression heat recovery rate is larger than or equal to 95% through heat-electricity cooperative management, and the system is safer and more environmentally friendly.

Description

Technical Field

[0001] This application relates to the technical field of chamber compressed air energy storage, for example, to an artificial chamber compressed air energy storage device. Background Art

[0002] Compressed air energy storage, that is, compressed air energy storage, refers to a method of storing energy in which electrical energy is used to compress air during the low load period of the power grid, and the compressed air is released to drive a steam turbine to generate electricity during the high load period of the power grid.

[0003] Although compressed air energy storage has great potential, there are still some limitations. For example, Traditional compressed air energy storage relies on natural salt caverns or abandoned mines as gas storage reservoirs, with harsh geographical conditions (requiring specific geological structures), poor geographical adaptability, and insufficient applicability; Traditional supplementary combustion type requires burning natural gas to heat and expand air, resulting in low efficiency (40 - 50%) and environmental friendliness; Existing artificial gas storage facilities (such as steel containers) are costly and cannot be applied on a large scale; The high - grade heat energy (above 400 °C) generated during the compression process is not effectively utilized, resulting in more than 60% energy waste. Summary of the Invention

[0004] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments. Instead, it serves as a preface to the subsequent detailed description.

[0005] To solve the above - mentioned technical problems, this application provides an artificial chamber compressed air energy storage device; this artificial chamber compressed air energy storage device uses an artificial reinforced concrete chamber to replace natural salt caverns, achieving a breakthrough in geographical adaptability. The non - supplementary combustion design combined with high - temperature adiabatic compression significantly improves energy efficiency. The thermal - electricity collaborative management enables the compression heat recovery rate to be ≥95%, and it is safer and more environmentally friendly.

[0006] An artificial chamber compressed air energy storage device provided by this application includes An underground artificial chamber gas storage system, including a reinforced concrete chamber excavated manually, and the inner wall of the chamber is covered with a flexible airtight layer; A non - supplementary combustion high - temperature adiabatic compression unit, which compresses air to 8 - 15 MPa through a multi - stage centrifugal compressor and inputs it into the chamber through a high - pressure pipeline; A compression heat recovery system, including a spiral coil heat exchanger and a high - temperature heat storage tank. The spiral coil heat exchanger is coaxially connected to the exhaust end of the non - supplementary combustion high - temperature adiabatic compression unit, and the high - temperature heat storage tank is buried in the side wall of the chamber and connected to the spiral coil heat exchanger through a molten salt circulation pipeline; The expansion power generation unit includes a turbine and a generator. The air inlet of the turbine is connected to a high-temperature heat storage tank through a reheating pipeline, and the exhaust outlet of the turbine is communicated to a chamber through a power generation pipeline.

[0007] In a further improvement of the present invention, the chamber is a structure of multiple parallel arched cavities. Adjacent cavities are connected by a horizontal pressure balance pipeline, and a two-way regulating valve is arranged in the horizontal pressure balance pipeline. The valve body spacing of the two-way regulating valve is 1 / 3 - 1 / 2 of the cavity length.

[0008] In a further improvement of the present invention, the non-supplementary combustion high-temperature adiabatic compression unit includes a four-stage centrifugal compressor. An inter-stage cooler is arranged after each stage of compression. The exhaust temperature of the last stage is ≥550°C. The inner lining of the compressor cylinder is a silicon carbide-reinforced alumina ceramic matrix composite material with a thickness of 10 - 15 mm.

[0009] In a further improvement of the present invention, the flexible airtight layer includes, from the inside to the outside, A polymer membrane with a thickness of 1.0 - 1.5 mm and a material of polytetrafluoroethylene; A basalt fiber-reinforced rubber layer with a thickness of 8 - 10 mm and a fiber volume content of ≥40%; A nano-silicate coating with a thickness of 80 - 120 μm and a spraying density of 2 - 3 g / cm³; The outer layer is a nano-silicate coating with a thickness of 50 - 200 μm.

[0010] In a further improvement of the present invention, the compression heat recovery system further includes, An adjustable molten salt circulation pump, which is arranged in the middle section of the molten salt circulation pipeline. The pump body adopts a magnetic drive structure, and the flow regulation accuracy is ±5%; A temperature feedback module, which monitors the molten salt outlet temperature in real time and controls the pump speed. The temperature difference threshold is ≤10°C.

[0011] In a further improvement of the present invention, a pressure-deformation monitoring array is arranged on the top of the chamber. The pressure-deformation monitoring array includes, Fiber Bragg grating sensors, which are arranged at intervals of 0.5 m along the axis of the chamber vault; Distributed acoustic wave sensors, which cover more than 70% of the inner wall area of the chamber; A data acquisition terminal, which is connected to the ground control center through a wired transmission link.

[0012] In a further improvement of the present invention, the artificial chamber compressed air energy storage device is configured with a geographical adaptability expansion unit. The geographical adaptability expansion unit includes, A geological radar scanning module, which outputs the RQD value and compressive strength of the rock mass; The adaptive design algorithm for chamber parameters dynamically calculates the chamber span L = K×√(σ / ρ) according to the RQD value, where K is the safety factor, σ is the uniaxial compressive strength of the rock mass, and ρ is the chamber burial depth density; The micro-tunnel boring robot is equipped with a laser navigator and the deviation during tunneling along the design axis is ≤±0.3°.

[0013] In the further improvement of the present invention, the expansion power generation unit adopts a three-stage reheat turbine structure, where, The inlet temperature of the first-stage turbine is 550 - 600 °C; the reheat temperature of the second stage is 480 - 520 °C; the exhaust temperature of the last-stage turbine is ≤80 °C, and a silicon carbide coating is formed on the blade surface by plasma spraying, with a coating thickness of 50 - 80 μm and a porosity of ≤3%.

[0014] In the further improvement of the present invention, the operation of the artificial chamber compressed air energy storage device includes, Energy storage stage: Using low-valley electric energy to drive a non-supplementary combustion high-temperature adiabatic compressor unit to compress air into the chamber and store heat in the high-temperature heat storage tank; Energy release stage: High-pressure air is heated to 500 - 550 °C through a reheating pipeline to drive the turbine, and the system cycle efficiency is 65 - 68%; Pressure balance stage: The intelligent valve group adjusts the air pressure difference between adjacent chambers to within ±0.2 MPa.

[0015] In the further improvement of the present invention, a condensate collection system is provided at the bottom of the chamber. The condensate collection system includes, An inclined diversion trough with a bottom slope of 8 - 12°, and a V-shaped stainless steel filter screen with a pore diameter of ≤1 mm is arranged in the trough; An electric drain valve that is activated in response to the signal of a humidity sensor; A reverse osmosis module that transports purified water to the inter-stage cooler through a high-pressure pump.

[0016] Compared with the prior art, the present application has the following beneficial effects: The present application uses artificial reinforced concrete chambers to replace natural salt caverns, breaking through geographical adaptability. The non-supplementary combustion design combined with high-temperature adiabatic compression significantly improves energy efficiency. The thermal-electric collaborative management achieves a compression heat recovery rate of ≥95%, and it is safer and more environmentally friendly.

[0017] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0018] To more clearly illustrate the background art or the technical solutions of the present application, the accompanying drawings used in the prior art or specific embodiments will be briefly introduced below; obviously, the structures, ratios, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present application. Therefore, they do not have technical substantial significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

[0019] Figure 1 It is a structural block diagram of a specific embodiment of the present application.

[0020] As shown in the figure: 1. Chamber; 2. Non-supplementary combustion high-temperature adiabatic compression unit; 3. Compression heat recovery system; 4. Spiral coil heat exchanger; 5. High-temperature heat storage tank; 6. Expansion generator set; 7. Turbine; 8. Generator; 9. Adjustable molten salt circulation pump. Specific Embodiment

[0021] In order to be able to understand the features and technical content of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. The attached drawings are only for reference and explanation purposes and are not used to limit the embodiments of the present application; in the following technical description, for the sake of explanation, multiple details are provided to fully understand the disclosed embodiments; however, one or more embodiments can still be implemented without these details; in other cases, well-known structures and devices can be shown in a simplified manner.

[0022] The terms "first", "second", etc. in the embodiments of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence; it should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described here; in addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0023] In the embodiments of the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings; these terms are mainly used to better describe the embodiments of the present application and their embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation; and, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases; for those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to specific circumstances.

[0024] In addition, the terms "arranged", "connected", "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components; for those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0025] Unless otherwise specified, the term "plurality" means two or more.

[0026] In the embodiments of the present application, the character " / " means that the objects before and after are in an "or" relationship. For example, Z / X means: Z or X; the term "and / or" is an associative relationship describing objects, indicating that there can be three relationships. For example, Z and / or X means: Z or X, or, Z and X these three relationships.

[0027] It should be noted that, without conflict, the embodiments in the embodiments of the present application and the features in the embodiments can be combined with each other.

[0028] Compressed air energy storage has great potential, but there are still some limitations. For example, Traditional compressed air energy storage relies on natural salt caverns or abandoned mines as gas storage reservoirs, with harsh geographical conditions (requiring specific geological structures), poor geographical adaptability, and insufficient applicability; Traditional supplementary combustion type needs to burn natural gas to heat and expand air, resulting in low efficiency (40 - 50%) and environmental friendliness; Existing artificial gas storage facilities (such as steel containers) have high costs and cannot be applied on a large scale; The high-grade heat energy (above 400 °C) generated during the compression process is not effectively utilized, resulting in more than 60% energy waste.

[0029] Therefore, the design concept of the present application is to design an artificial chamber compressed air energy storage device that can solve the above problems.

[0030] As Figure 1 shown, the present application provides an artificial chamber compressed air energy storage device, including an underground artificial chamber air storage system, including a reinforced concrete chamber excavated manually, the inner wall of the chamber being covered with a flexible airtight layer; a non-supplementary combustion high-temperature adiabatic compressor unit, which compresses air to 8-15 MPa through a multi-stage centrifugal compressor and inputs it into the chamber through a high-pressure pipeline; a compression heat recovery system, including a spiral coil heat exchanger and a high-temperature heat storage tank, the spiral coil heat exchanger being coaxially connected to the exhaust end of the non-supplementary combustion high-temperature adiabatic compressor unit, the high-temperature heat storage tank being buried on the side wall of the chamber and connected to the spiral coil heat exchanger through a molten salt circulation pipeline; an expansion generator set, including a turbine and a generator, the air inlet of the turbine being connected to the high-temperature heat storage tank through a reheating pipeline, and the exhaust port of the turbine being communicated to the chamber through a power generation pipeline.

[0031] It can be understood that using an artificial reinforced concrete chamber to replace the natural salt cavern breaks through the dependence of traditional compressed air energy storage on specific geological conditions, and gas storage facilities can be built in hard rock formations such as granite and sandstone, achieving a breakthrough in geographical adaptability; the non-supplementary combustion design combined with high-temperature adiabatic compression (≥550 °C) avoids more than 60% of the energy waste caused by supplementary combustion in traditional technologies, and the overall efficiency of the system is increased to 65-68%, achieving a significant improvement in energy efficiency; the compression heat recovery system realizes a compression heat recovery rate ≥95% through the closed-loop design of the spiral coil heat exchanger and the molten salt heat storage tank, and the thermal energy utilization rate is increased by 40% compared with the traditional scheme, achieving thermal-electric collaborative management; the flexible airtight layer (leakage rate ≤0.05% / day) and the closed-loop design of the turbine exhaust avoid high-pressure gas leakage and carbon emissions, achieving enhanced safety and environmental protection.

[0032] Among them, the chamber is a structure of multiple parallel arched cavities, and adjacent cavities are connected through a horizontal pressure balance pipeline. A two-way regulating valve is arranged in the horizontal pressure balance pipeline, and the valve body spacing of the two-way regulating valve is 1 / 3-1 / 2 of the cavity length.

[0033] It can be understood that multiple parallel arched cavity structures (single cavity volume ≥5000 m³) support on-demand expansion, and the unit energy storage cost is reduced by 35%, achieving elastic capacity expansion; the horizontal pressure balance pipeline and the two-way regulating valve work together to control the air pressure difference between adjacent cavities within ±0.2 MPa, preventing structural damage caused by local overpressure and achieving dynamic pressure balance; the arched structure + valve body spacing optimization (1 / 3-1 / 2 of the cavity length) improves the overall stability of the chamber group during geological activities and enhances the seismic stability.

[0034] Among them, the non-supplementary combustion high-temperature adiabatic compression unit includes a four-stage centrifugal compressor. An inter-stage cooler is provided after each stage of compression. The exhaust temperature of the last stage is ≥550°C. The inner liner of the compressor cylinder is a silicon carbide-reinforced alumina ceramic matrix composite material with a thickness of 10 - 15 mm.

[0035] It can be understood that the four-stage centrifugal compressor, in combination with the inter-stage cooler, reduces the compression energy consumption to 2.0 - 2.2 kWh / Nm³, saves 15% energy compared to the three-stage compression scheme, and realizes the optimization of compression efficiency; the silicon carbide-reinforced alumina ceramic inner liner (temperature resistance ≥800°C) ensures that the compressor can continuously operate at a high temperature of 550°C for ≥100,000 hours, realizing high-temperature tolerance; the inner liner thickness of 10 - 15 mm reduces the erosion of the high-temperature gas flow on the cylinder, and the maintenance period is extended to twice that of the traditional scheme, realizing the extension of equipment life.

[0036] Among them, the flexible airtight layer includes, from the inside to the outside, a polymer membrane with a thickness of 1.0 - 1.5 mm and a material of polytetrafluoroethylene; a basalt fiber-reinforced rubber layer with a thickness of 8 - 10 mm and a fiber volume content of ≥40%; a nano-silicate coating with a thickness of 80 - 120 μm and a spraying density of 2 - 3 g / cm³; The outer layer is a nano-silicate coating with a thickness of 50 - 200 μm.

[0037] It can be understood that the polytetrafluoroethylene membrane (1.0 - 1.5 mm) provides chemically inert sealing, and the acid and alkali corrosion resistance life is ≥30 years; the basalt fiber rubber layer (fiber content ≥40%) enhances the tensile strength (≥50 MPa) and resists the deformation under a high pressure of 15 MPa; the nano-silicate coating (spraying density 2 - 3 g / cm³) fills the micro-pores, and the leakage rate is reduced to 0.03% / day, realizing multi-layer collaborative sealing; the layered structure supports modular construction, shortens the construction period by 40%, and realizes the construction convenience.

[0038] Among them, the compression heat recovery system further includes, an adjustable molten salt circulation pump, which is arranged in the middle section of the molten salt circulation pipeline. The pump body adopts a magnetic drive structure, and the flow regulation accuracy is ±5%; a temperature feedback module, which monitors the molten salt outlet temperature in real time and controls the pump speed, and the temperature difference threshold is ≤10°C.

[0039] It is understandable that the magnetic drive molten salt circulation pump (flow regulation accuracy ±5%) is combined with the temperature difference threshold control (≤10°C), reducing the molten salt heat storage temperature difference by 60% compared with the traditional solution, achieving precise thermal management; dynamically adjusting the pump speed to match the compressor power fluctuation, avoiding energy loss caused by overheating / cooling of the molten salt, with the system efficiency fluctuation range ≤±2%, ensuring energy efficiency stability; the mechanical seal-free design (magnetic drive) reduces the failure rate, with the maintenance cost reduced by 30% and the reliability improved.

[0040] Among them, a pressure-deformation monitoring array is arranged on the top of the chamber, and the pressure-deformation monitoring array includes fiber Bragg grating sensors, arranged at intervals of 0.5 m along the axis of the chamber vault; distributed acoustic wave sensors, covering more than 70% of the inner wall area of the chamber; a data acquisition terminal, connected to the ground control center through a wired transmission link.

[0041] It is understandable that the fiber Bragg grating sensors (with a spacing of 0.5 m) monitor the deformation accuracy of ±0.1 mm, warning of structural cracks; the distributed acoustic wave sensors cover 70% of the inner wall, with the gas leakage detection sensitivity ≥1 ppm, providing real-time safety warnings; the wired transmission link avoids wireless signal interference, with the data loss rate <0.01%, ensuring data reliability; the operation and maintenance cost is optimized, with automatic monitoring replacing manual inspection, reducing the labor cost by 50%.

[0042] Among them, the artificial chamber compressed air energy storage device is equipped with a geographical adaptability expansion unit, and the geographical adaptability expansion unit includes a geological radar scanning module, outputting the RQD value and compressive strength of the rock mass; an adaptive design algorithm for chamber parameters, dynamically calculating the chamber span L = K×√(σ / ρ) according to the RQD value, where K is the safety factor (1.2 - 1.5), σ is the compressive strength of the rock mass, and ρ is the chamber burial depth density; a micro-tunnel boring robot, equipped with a laser navigator, with the tunneling deviation along the design axis ≤±0.3°.

[0043] It is understandable that the geological radar scanning module outputs the RQD value and compressive strength (σ), guiding the calculation of the chamber span (L = K×√(σ / ρ)), adapting to the rock mass strength of 50 - 250 MPa; the adaptive algorithm (safety factor K = 1.2 - 1.5) dynamically optimizes the support density, reducing the material waste by 20%, achieving geological adaptability; the laser navigator controls the tunneling axis deviation ≤±0.3°, with the accuracy improved by 80% compared with the traditional directional drilling, ensuring the construction accuracy; the micro-tunneling robot (tunneling speed ≥20 m / day) shortens the construction period by 40% in the granite formation, with high hard rock construction efficiency.

[0044] Among them, the expansion generator set adopts a three-stage reheat turbine structure, where, The inlet temperature of the first-stage turbine is 550 - 600 °C; the second-stage reheat temperature is 480 - 520 °C; the exhaust temperature of the last-stage turbine is ≤80 °C. A silicon carbide coating is formed on the blade surface by plasma spraying, with a coating thickness of 50 - 80 μm and a porosity of ≤3%.

[0045] It can be understood that through the cascaded utilization of thermal energy, the three-stage reheat structure (the first stage at 550 - 600 °C and the second stage at 480 - 520 °C) can increase the turbine efficiency to 42 - 45%; the exhaust temperature of the last stage is ≤80 °C, reducing waste heat waste by ≥90%; for erosion protection, the plasma-sprayed silicon carbide coating (porosity ≤3%) can extend the blade life to ≥100,000 hours, which is 3 times longer than that of uncoated blades; the closed-loop power generation pipeline design achieves zero carbon emissions and is more environmentally friendly.

[0046] Among them, the operation of the artificial chamber compressed air energy storage device includes, Energy storage stage: Utilize low-valley electric energy to drive a non-supplementary combustion high-temperature adiabatic compressor unit to compress air into the chamber and store heat in the high-temperature heat storage tank; Energy release stage: The high-pressure air is heated to 500 - 550 °C through a reheating pipeline to drive the turbine, and the system cycle efficiency is 65 - 68%; Pressure balance stage: The intelligent valve group adjusts the air pressure difference between adjacent chambers to within ±0.2 MPa.

[0047] It can be understood that for peak-valley electricity price arbitrage, the energy storage stage utilizes low-valley electric energy (the electricity price is reduced by 60 - 70%), and the power supply income in the energy release stage increases by 25%; for efficient heat cycle, the high-pressure air is reheated to 500 - 550 °C to drive the turbine to generate electricity continuously for ≥8 hours, and the system cycle efficiency is stably maintained at 65 - 68%; for pressure balance control, the intelligent valve group (response time ≤50 ms) maintains the pressure balance of the chamber group to avoid the risk of local overpressure.

[0048] Among them, a condensate water collection system is arranged at the bottom of the chamber. The condensate water collection system includes, An inclined diversion trough with a bottom slope of 8 - 12°, and a V-shaped stainless steel filter screen with a pore diameter of ≤1 mm is arranged in the trough; An electric drain valve that is activated in response to the signal of a humidity sensor (RH ≥ 60%); A reverse osmosis module that transports purified water to the inter-stage cooler through a high-pressure pump.

[0049] It is understandable that the inclined diversion trough (with a slope of 8 - 12°) has a collection efficiency ≥ 95%, the water production rate of the reverse osmosis module ≥ 95%; the purified water is used for the make-up of the inter-stage cooler, with annual water saving ≥ 5000 tons, achieving the recycling of water resources; anti-blocking design, the V-shaped stainless steel filter screen (with a pore diameter ≤ 1mm) intercepts impurities, and the maintenance period is extended to 6 months; automated operation and maintenance, the humidity sensor (triggered when RH ≥ 60%) is linked with the electric drain valve to achieve unattended operation.

[0050] Advantages of this application Global geological adaptation: Artificial chambers (Claims 1 - 2) replace salt caverns. Combining geological radar scanning (Claim 7) with an adaptive algorithm, gas storage caverns can be built in hard rock formations such as granite and sandstone; The micro-tunnel boring robot (Claim 7) improves the construction efficiency by 40% and reduces the development cost by 35% compared with salt cavern development.

[0051] High-efficiency thermal-electric conversion: Non-supplementary combustion design (Claim 1) is coupled with molten salt thermal energy storage (Claim 5), the compression heat recovery rate ≥ 95%, and the system cycle efficiency is increased to over 65% (using the adiabatic non-supplementary combustion principle); The multi-stage centrifugal compressor (Claim 3) and the inter-stage cooler cooperate, reducing the compression energy consumption by 18%.

[0052] High-pressure safety protection: The basalt fiber-reinforced structure of the flexible airtight layer (Claim 4) makes the leakage rate of the chamber ≤ 0.03% / day, with a lifespan exceeding 30 years; The pressure-deformation monitoring array (Claim 6) gives real-time warnings, and the accuracy of the structural deformation threshold reaches ±0.1mm.

[0053] Full-cycle economy: The modular parallel chambers (Claim 2) support on-demand expansion, and the unit energy storage cost is reduced by 52% compared with the salt cavern solution; The condensate water collection system (Claim 10) and the molten salt heat recovery cooperate, reducing the annual operation and maintenance cost by 28%.

[0054] The above description and the drawings fully illustrate the embodiments of this application, enabling those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations can vary. Parts and features of some embodiments can be included in or replace parts and features of other embodiments. The embodiments of this application are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is only limited by the appended claims.

Claims

1. An artificial chamber compressed air energy storage device, characterized in that: include, An underground artificial chamber gas storage system comprises a reinforced concrete chamber dug by hand, the inner wall of the chamber being covered with a flexible airtight layer; The non-supplementary high-temperature adiabatic compressor unit compresses the air to 8-15MPa through a multi-stage centrifugal compressor and inputs it into the chamber through a high-pressure pipeline; The compression heat recovery system includes a spiral coil heat exchanger and a high-temperature heat storage tank, wherein the spiral coil heat exchanger is coaxially connected to the exhaust end of the non-supplementary high-temperature adiabatic compressor unit, and the high-temperature heat storage tank is buried in the side wall of the chamber and connected to the spiral coil heat exchanger through a molten salt circulation pipeline; The expansion generator set includes a turbine and a generator. The air inlet of the turbine is connected to a high-temperature heat storage tank through a reheating pipeline, and the exhaust port of the turbine is connected to the chamber through a power generation pipeline.

2. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The chamber is a structure of multiple parallel arched cavities, and adjacent cavities are connected by horizontal pressure balancing pipes. A two-way regulating valve is arranged in the horizontal pressure balancing pipe, and the valve body spacing of the two-way regulating valve is 1 / 3-1 / 2 of the cavity length.

3. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The non-supplementary-fired high-temperature adiabatic compressor unit comprises a four-stage centrifugal compressor, an interstage cooler is arranged after each stage of compression, the exhaust temperature of the final stage is ≥550°C, and the compressor cylinder lining is a silicon carbide reinforced alumina ceramic-based composite material with a thickness of 10-15mm.

4. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The flexible airtight layer includes, from inside to outside, High molecular polymer film, thickness 1.0-1.5mm, made of polytetrafluoroethylene; Basalt fiber reinforced rubber layer, thickness 8-10mm, fiber volume content ≥40%; Nano-silicate coating, thickness 80-120μm, spray density 2-3g / cm³; The outer layer is a nano-silicate coating with a thickness of 50-200 μm.

5. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The compression heat recovery system further comprises: The adjustable molten salt circulation pump is located in the middle section of the molten salt circulation pipeline. The pump body adopts a magnetic drive structure with a flow adjustment accuracy of ±5%; The temperature feedback module monitors the molten salt outlet temperature in real time and controls the pump speed. The temperature difference threshold is ≤10℃.

6. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The top of the chamber is provided with a pressure-deformation monitoring array, which includes: Fiber Bragg grating sensors are arranged at a spacing of 0.5m along the axis of the chamber vault; Distributed acoustic wave sensors cover more than 70% of the inner wall area of ​​the chamber; The data acquisition terminal is connected to the ground control center via a wired transmission link.

7. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The artificial chamber compressed gas energy storage device is equipped with a geographical adaptability expansion unit, which includes: Geological radar scanning module, outputs rock mass RQD value and compressive strength; The chamber parameter adaptive design algorithm dynamically calculates the chamber span L=K×√(σ / ρ) according to the RQD value, where K is the safety factor, σ is the compressive strength of the rock mass, and ρ is the chamber burial depth density; The micro tunnel boring robot is equipped with a laser navigator, and the excavation deviation along the designed axis is ≤±0.3°.

8. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The expansion generator set adopts a three-stage reheat turbine structure, wherein: The first-stage turbine inlet temperature is 550-600℃; the second-stage reheat temperature is 480-520℃; the final-stage turbine exhaust temperature is ≤80℃. The blade surface is coated with silicon carbide by plasma spraying, with a coating thickness of 50-80μm and a porosity of ≤3%.

9. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: The operation of the artificial chamber compressed air energy storage device includes: Energy storage stage: Use off-peak electricity to drive the non-supplementary high-temperature adiabatic compressor unit to compress the air into the chamber and store the heat in the high-temperature heat storage tank; Energy release stage: high-pressure air is heated to 500-550℃ through the reheat pipe to drive the turbine, and the system cycle efficiency is 65-68%; Pressure balance stage: The intelligent valve group adjusts the air pressure difference between adjacent chambers to within ±0.2MPa.

10. The artificial chamber compressed air energy storage device according to claim 1, characterized in that: A condensate collection system is provided at the bottom of the chamber, and the condensate collection system comprises: Inclined diversion trough, the bottom slope is 8-12°, and a V-shaped stainless steel filter is installed in the trough with a pore size of ≤1mm; An electric drain valve is activated in response to a humidity sensor signal; Reverse osmosis module, which delivers purified water to the interstage cooler via a high-pressure pump.

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