Underground gas storage pile foundation energy comprehensive utilization system and construction and installation method thereof

Abstract

The invention discloses an underground gas storage pile foundation energy comprehensive utilization system which comprises a compressed air preparation module, an underground gas storage pile energy storage module, a heat recycling module and an expansion power generation module, the compressed air preparation module comprises a compressor unit and a cooler, and the compressed air preparation module is used for preparing and cooling compressed air; the underground air storage pile energy storage module comprises one or more underground air storage piles, and the underground air storage piles are used for storing normal-temperature high-pressure compressed air; the expansion power generation module comprises a turbine expansion unit and a power generator, and the turbine expansion unit is used for expanding the normal-temperature high-pressure compressed air so as to drive the power generator to generate power; the heat recycling module is used for recycling heat and cold generated in the air compression process or expansion process, a pressure-resistant sealed space is constructed in a pile body to store compressed air, and the heat recycling module and a rock-soil body auxiliary heat exchange loop are arranged, so that heat-electricity-cold combined supply and multi-energy collaborative management of a building are achieved.

Description

Technical Field

[0001] This application relates to the technical field of building and energy integration, and in particular to an underground gas storage pile foundation energy comprehensive utilization system and its construction and installation method. Background Technology

[0002] With the continued advancement of "dual carbon" goals, the demand for energy conservation and emission reduction in the building sector is becoming increasingly prominent. To achieve peak shaving and valley filling of building energy consumption and the efficient utilization of renewable energy, compressed air energy storage technology is gradually evolving towards distributed and miniaturized designs. However, traditional distributed compressed air energy storage typically requires the separate construction of storage containers or chambers, which are easily constrained by limited building land and safety concerns. Simultaneously, the building's foundation structure contains a large amount of neglected underground space; therefore, how to organically integrate building foundations with energy storage devices has become a key issue of concern in the industry.

[0003] To address the aforementioned issues, this invention proposes an underground gas storage pile foundation energy comprehensive utilization system. By constructing a pressure-resistant sealed space inside the pile to store compressed air and configuring a heat recovery and utilization module and an auxiliary heat exchange circuit with the soil and rock mass, it enables the building to achieve combined heat, power and cooling and multi-energy collaborative management, providing an innovative solution for distributed energy storage and low-carbon building development. Summary of the Invention

[0004] The purpose of this application is to provide an underground gas storage pile foundation energy comprehensive utilization system. By constructing a pressure-resistant sealed space inside the pile to store compressed air and configuring a heat recovery and utilization module and a soil-rock auxiliary heat exchange circuit, the system can realize the building's combined heat, power and cooling and multi-energy collaborative management, providing an innovative solution for distributed energy storage and low-carbon building development.

[0005] The first aspect of this application provides an underground gas storage pile foundation energy comprehensive utilization system, characterized in that it includes: a compressed air preparation module, an underground gas storage pile energy storage module, a heat recovery and utilization module, and an expansion power generation module, wherein...

[0006] The compressed air preparation module includes a compressor unit and a cooler, and the compressed air preparation module is used to prepare and cool compressed air.

[0007] The underground gas storage pile energy storage module includes one or more underground gas storage piles, which are used to store room temperature high pressure compressed air.

[0008] The expansion power generation module includes a turbine expander and a generator. The turbine expander is used to expand the ambient temperature high pressure compressed air, thereby driving the generator to generate electricity, which is then provided to the user.

[0009] The heat recycling module is used to recycle the heat and cold generated in the air compression process or expansion process.

[0010] In another preferred embodiment, the compressor set is configured to compress air to obtain compressed air; the cooler is connected with the compressor set and cools the high-temperature and high-pressure compressed air discharged by the compressor set.

[0011] In another preferred embodiment, the system comprises an intelligent integrated management unit, which is used to monitor and optimize system operation.

[0012] In another preferred embodiment, the intelligent integrated management unit can realize efficient, collaborative scheduling and safe management of energy (cold and heat energy, electric energy).

[0013] In another preferred embodiment, the system further comprises a reheater, the heat recycling module comprises a heat accumulator connected with the cooler, which is used to recycle the heat generated in the air compression process, and the reheater is connected with the heat accumulator, which is used to heat the constant-temperature and high-pressure compressed air for the second time before expansion.

[0014] In another preferred embodiment, the heat recycling module further comprises a cold accumulator connected with the turboexpander set, which is used to absorb and store the low-temperature cold generated by expanding the constant-temperature and high-pressure air, and the cold accumulator is also connected with the cooler, so as to transfer the low-temperature cold to the cooler, thereby forming a closed loop cycle of heat and cold energy.

[0015] In another preferred embodiment, the system further comprises an air input pipeline and an air output pipeline, the turboexpander set is connected with the underground air storage pile through the air output pipeline; the underground air storage pile is connected with the cooler through the air input pipeline, and the underground air storage pile is used to store the constant-temperature and high-pressure compressed air cooled by the cooler.

[0016] In another preferred embodiment, the system further comprises an electric motor, which is used to drive the compressor set, and the electric power of the electric motor is derived from commercial power or wind energy or solar energy.

[0017] In another preferred embodiment, when the electric power of the electric motor is derived from commercial power, the surplus electric energy in the off-peak period of power grid load is used to drive the electric motor, which in turn drives the compressor set.

[0018] In another preferred embodiment, the underground air storage pile comprises a pile body, an embedded pipe, a bottom sealing body, and a top sealing cover, the bottom sealing body and the top sealing cover and the pile body together define a sealed space, and the embedded pipe is arranged in the sealed space and is used to store constant-temperature and high-pressure compressed air.

[0019] In another preferred embodiment, the diameter of the built-in pipe is greater than 800 mm.

[0020] In another preferred embodiment, the built-in pipe is made of steel or other materials, such as rubber or inorganic flexible airtight material.

[0021] In another preferred embodiment, the built-in pipe is in close contact with the inner wall of the pile body.

[0022] In another preferred embodiment, the pile body is composed of one or more segmented pile bodies, and two adjacent segmented pile bodies are connected by end plates.

[0023] In another preferred embodiment, the pile body is pre-buried with a grouting guide pipe, the bottom of the grouting guide pipe is provided with a grouting outlet, and the top of the grouting guide pipe is provided with a grouting inlet.

[0024] In another preferred embodiment, the length of the underground gas storage pile is not less than 6 m.

[0025] In another preferred embodiment, a heat exchange loop is provided between the system and the surrounding rock-soil mass, the heat exchange loop includes heat exchange pipes or heat exchange components in close contact with the rock-soil mass, so that the cold and heat in the system can be exchanged with the rock-soil mass, thereby achieving auxiliary storage and regulation of heat or cold.

[0026] In another preferred embodiment, the heat exchange loop is in communication with the heat recovery and utilization module, and the intelligent integrated management unit dynamically schedules the transfer of heat and / or cold between the pile body of the underground gas storage pile, the rock-soil mass, and the heat accumulator and the cold accumulator, thereby achieving auxiliary supply of building cold and heat load or regulation of peak-valley heat and / or cold.

[0027] In another preferred embodiment, the compressor set includes one or more compressors for multi-stage compression of the normal temperature and pressure air.

[0028] In another preferred embodiment, the turboexpander set includes a high-pressure turboexpander and a low-pressure turboexpander for step-by-step expansion of the normal temperature and high-pressure compressed air stored in the underground gas storage pile.

[0029] In another preferred embodiment, the inlet of the heat accumulator is connected to the outlet of the cooler.

[0030] In another preferred embodiment, the heat of the heat accumulator can also be provided to the user end.

[0031] In another preferred embodiment, the cold of the cold accumulator can be provided to the user end, and the cold of the cold accumulator can also be provided to the cooler.

[0032] In another preferred embodiment, the air input pipeline comprises a main air input pipeline and branch air input pipelines, and the branch air input pipelines are respectively connected to the air inlets of the underground air storage piles.

[0033] In another preferred embodiment, the air output pipeline comprises a main air output pipeline and branch air output pipelines, and the branch air output pipelines are respectively connected to the air outlets of the underground air storage piles, and a third pressure gauge and a third pressure sensor are arranged on each branch air output pipeline, and the third pressure gauge and the third pressure sensor are used to detect the pressure of the compressed air released by each underground air storage pile.

[0034] In another preferred embodiment, the arrangement of the third pressure gauge and the third pressure sensor can timely find out whether a single underground air storage pile is in a normal state.

[0035] In another preferred embodiment, the system further comprises a first pressure gauge and a first pressure sensor arranged on the main air input pipeline, and the first pressure gauge and the first pressure sensor are used to measure the pressure of the compressed air entering the underground air storage pile.

[0036] In another preferred embodiment, the system further comprises a second pressure gauge and a second pressure sensor arranged on the main air output pipeline, and the second pressure gauge and the second pressure sensor are used to measure the pressure of the compressed air released from the underground air storage pile.

[0037] In another preferred embodiment, the system further comprises safety valves arranged on the branch air input pipelines and the branch output pipelines.

[0038] In another preferred embodiment, the system further comprises a first filter and a first air dryer arranged on the main air input pipeline downstream of the cooler, the first filter is used to remove oil, dust and particulate matters in the compressed air, and the first air dryer is used to dry and filter water vapor in the compressed air.

[0039] In another preferred embodiment, a second filter and a third filter are further arranged on the first air dryer, and the second filter and the third filter perform secondary filtration, so that the cleanliness of the compressed air is higher. In another preferred embodiment, the system further comprises a second air dryer arranged on the main air output pipeline.

[0040] In another preferred embodiment, the system further comprises a fourth filter arranged upstream of the second air dryer and a fifth filter and a sixth filter arranged downstream of the second air dryer.

[0041] In another preferred embodiment, the device further comprises an integrated management unit, which is configured to monitor the working state of the underground gas pile energy integrated utilization system, and is further configured to exchange heat with the user end by the heat and cold provided by the heat accumulator and the cold accumulator.

[0042] The second aspect of the present application provides a construction and installation method suitable for the underground gas pile energy integrated utilization system described above, characterized in that the method comprises the following steps:

[0043] Step S1: manufacturing of prefabricated pipe piles;

[0044] Step S2: drilling and pile sinking;

[0045] Step S3: pile splicing;

[0046] Step S4: repeating S2 and S3 until the pile length reaches the design length or the pile end is effectively embedded in the design stratum;

[0047] Step S5: dredging and bottom sealing;

[0048] Step S6: repeating S1 to S5 until all pile foundation construction is completed;

[0049] Step S7: sealing test and pile body detection;

[0050] Step S8: installation of a top sealing cover;

[0051] Step S9: installation of an air input pipeline, the compressor set, the cooler, and the heat accumulator;

[0052] Step S10: installation of an air output pipeline and the turboexpander set;

[0053] Step S11: installation of a motor and the generator;

[0054] Step S12: connecting each device to the intelligent integrated management unit;

[0055] Step S13: commissioning;

[0056] Step S14: operation.

[0057] In another preferred embodiment, in Step S1, the manufacturing of prefabricated pipe piles comprises: embedding a grouting pipe in the pipe wall of the pipe pile when the pipe pile is prefabricated in a factory; and performing corrosion prevention treatment on the inner wall of the pipe pile by applying a corrosion prevention coating.

[0058] In another preferred embodiment, in Step S3, the pile splicing comprises: connecting the upper and lower pipe piles by welding; connecting the grouting pipes between the upper and lower pipe piles by high-strength aluminum plastic pipes; and sealing the grouting pipes and the high-strength aluminum plastic pipes by sealing rings.

[0059] In another preferred embodiment, the step S10 further comprises installing a reheater and a cold accumulator.

[0060] It should be understood that, within the scope of the present application, the above technical features of the present application and the technical features specifically described hereinafter (e.g. in the examples) can be combined with each other to form new or preferred technical solutions. Due to the limited space, they will not be listed one by one here. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced hereinafter. It should be understood that the drawings described hereinafter are only some of the embodiments of the present application, and those skilled in the art can also obtain other embodiments from these drawings without paying creative labor.

[0062] Figure 1 is a schematic diagram of an underground gas storage pile foundation energy comprehensive utilization system according to the present application;

[0063] Figure 2 is a structural schematic diagram of a single pile foundation of the underground gas storage pile foundation energy comprehensive utilization system according to the present application;

[0064] Figure 3 is a pile foundation cross-sectional schematic diagram of a single pile foundation according to the present application.

[0065] In each drawing, the following marks are used

[0066] 1 - underground gas storage pile

[0067] 101 - pile body

[0068] 1011 - grouting guide pipe

[0069] 1012 - grouting port

[0070] 1013 - grouting outlet

[0071] 1014 - end plate

[0072] 102 - built-in pipe

[0073] 103 - bottom sealing body

[0074] 104 - top sealing cover

[0075] 1041 - pressure relief pipeline

[0076] 2 - electric motor

[0077] 3 - compressor (group)

[0078] 4 - cooler

[0079] 5-accumulator

[0080] 601-first filter

[0081] 602-second filter

[0082] 603-third filter

[0083] 604-fourth filter

[0084] 605-fifth filter

[0085] 606-sixth filter

[0086] 701-first air dryer

[0087] 702-second air dryer

[0088] 8-turboexpander

[0089] 9-reheater

[0090] 10-cold accumulator

[0091] 11-generator

[0092] 12-integrated control unit

[0093] 201-air input pipe (air inlet pipe)

[0094] 202-first pressure gauge

[0095] 203-first pressure sensor

[0096] 401-air output pipe (air outlet pipe)

[0097] 402-second pressure gauge

[0098] 403-second pressure sensor

[0099] 501-third pressure gauge

[0100] 502-third pressure sensor

[0101] 503-second safety valve DETAILED DESCRIPTION

[0102] The present inventors have developed, through extensive and in-depth research, an underground gas storage pile foundation energy comprehensive utilization system, which utilizes a large-diameter, non-soil-extruding and high-load-bearing pipe pile to store compressed gas, utilizes surplus power during the low-load period of the power grid to drive a compressed air machine, stores compressed air in the large-diameter, non-soil-extruding and high-load-bearing pipe pile system of the building, and releases the compressed air to drive an engine to generate power during the high-load period of the power grid; and uses the compressed air stored in the pile foundation system of the building as an energy source to exchange heat with the interior of the building through a heat accumulator, a cold accumulator and the building to meet the heating and cooling needs of the building load.

[0103] The system and method integrate the bearing characteristics of the pile foundation of the building, small-scale air compression energy storage technology and heat recovery technology, thereby not only solving the limitation of the building space on the energy storage system and balancing the energy storage and energy of the building within a short period.

[0104] The present application aims to provide an underground gas storage pile foundation energy comprehensive utilization system with high load-bearing capacity and efficient energy storage characteristics, which sets a sealed structure capable of storing high-pressure compressed air inside the pile foundation of the building, and combines a heat accumulator, a reheater, a cold accumulator and a geotechnical heat exchange circuit to realize multi-dimensional energy comprehensive utilization. Through the system, not only can the low-valley power or renewable energy (wind energy, solar energy, etc.) be utilized to compress and store air to achieve peak-valley regulation, but also the heat or cold generated during the expansion and power generation of the compressed air can be efficiently recovered for heating or cooling needs in the building, thereby improving the overall energy efficiency.

[0105] The core innovations of the present application are as follows:

[0106] Coupling of pile foundation structure and compressed air energy storage

[0107] The large-diameter pile foundation of the building is utilized to form a high-strength and pressure-resistant corrosion-resistant sealed space, thereby breaking through the limitation of traditional gas storage devices on the occupation of the space above ground and ensuring the organic combination of the building structure and the gas storage function.

[0108] Multi-circuit coupling utilization of thermal and cold energy

[0109] The heat accumulator and the reheater are arranged to form a heat recovery circuit, and the cold accumulator forms a cold energy circuit, which are respectively used to collect or release the heat and cold generated by the compressed air during the compression and expansion links; and the heat exchange pipes are connected with the building load system to realize combined supply.

[0110] Incorporation of geotechnical auxiliary heat exchange technology

[0111] Heat exchange pipes or heat exchange members are arranged between the underground gas storage pile and the surrounding geotechnological body, the temperature characteristics of the geotechnological layer are utilized to further store or buffer the residual heat and cold, and the adaptability of the entire system to external climate and load fluctuations is enhanced.

[0112] Modularization and intelligent management and control

[0113] Each functional unit (compressor unit, heat accumulator, cold accumulator, turbine expander unit, geotechnical heat exchange circuit, integrated management and control unit, etc.) adopts modular design, facilitating construction, maintenance and capacity expansion; the intelligent management and control unit monitors and schedules the pressure, temperature and flow of the whole system, ensuring safe and efficient operation.

[0114] Therefore, the present application can be widely applied to urban building scenarios requiring large-scale or distributed energy storage, and can also provide integrated "load-storage-energy supply" solutions for industrial parks, community energy systems, etc., thereby having significant advantages in economic and environmental benefits.

[0115] In the following description, many technical details are presented in order to better enable the reader to understand the present application. However, it will be understood by those skilled in the art that the technical solutions claimed by the present application can be realized even without these technical details and based on various changes and modifications of the following embodiments.

[0116] Terms

[0117] As used herein, "compressor (unit)" and "multi-stage compressor" are used interchangeably;

[0118] It should be noted that in the application file of the present patent, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "includes one" does not exclude the presence of another identical element in the process, method, article or device including the element. In the application file of the present patent, if it is mentioned that a certain action is performed according to a certain element, it means that the action is performed at least according to the element, which includes two cases: the action is performed only according to the element, and the action is performed according to the element and other elements. The expressions of multiple, multiple times, multiple kinds, etc. include 2, 2 times, 2 kinds and more than 2, more than 2 times, more than 2 kinds.

[0119] In the present application, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, motion condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0120] The present application has at least one of the following advantages

[0121] (a) The underground gas storage pile energy comprehensive utilization system of the present application integrates the bearing characteristics of building pile foundation, small-scale air compression energy storage technology and heat recovery technology, not only solves the limitation of building space on energy storage system, making the energy balance in short period of building, but also realizes heat and power cogeneration through underground pipe pile system energy storage, with significant comprehensive benefits in energy consumption and economy;

[0122] (b) The underground gas storage pile energy comprehensive utilization system of the present application significantly improves the operation efficiency and reliability of the system by optimizing the connection and collaborative work of each component, for example, by setting multi-stage filters and air dryers, effectively removing impurities and moisture in compressed air, prolonging the service life of equipment; at the same time, the system adopts modular design, which is convenient for installation, maintenance and upgrading, further reducing the operation cost of the system;

[0123] (c) The underground gas storage pile energy comprehensive utilization system of the present application has high flexibility and adaptability, its construction and installation method can be adjusted according to different building requirements and geological conditions, suitable for various building types and application scenarios; in addition, the system can also flexibly configure energy storage capacity and power generation capacity according to user's energy demand, meeting the individual needs of different users;

[0124] (d) The underground gas storage pile energy comprehensive utilization system of the present application is compactly arranged, which is easy and fast to install by arranging in modules.

[0125] In order to make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings. It should be understood that these only provide some examples that the present application can take, but are not intended to limit the scope of the present application.

[0126] Embodiments

[0127] The present application provides an underground gas storage pile energy comprehensive utilization system, comprising: a compressor unit, one or more underground gas storage piles, a cooler, a heat accumulator, an air input pipeline, an air output pipeline, a turboexpander unit and a generator;

[0128] Referring to Figure 1The application provides an underground gas storage pile energy comprehensive utilization system, which comprises an underground gas storage pile 1, an electric motor 2, a compressor (group) 3, a cooler 4, a heat accumulator 5, a filter, an air dryer, a turbine expander (group) 8, a reheater 9, a cold storage device 10, a generator 11, a comprehensive management unit 12, an air input pipeline 201 and an air output pipeline 401. The air input pipeline 201 comprises a main air input pipeline and branch air input pipelines, and the air output pipeline 401 comprises a main air output pipeline and branch air output pipelines. Optionally, the compressor (group) 3 can comprise one or more compressors, and the number of the coolers 4 is the same as that of the compressors.

[0129] The compressor group 3 is configured to compress air at normal temperature and pressure, so as to obtain compressed air; the cooler 4 is connected with the compressor group 3 and cools the high-temperature and high-pressure compressed air discharged by the compressor group; the heat accumulator 5 is connected with the cooler 4 and is used for collecting and storing heat generated in the process of compressing air at normal temperature and pressure; the underground gas storage pile 1 is connected with the cooler 4 through the air input pipeline 201, and is used for storing the normal-temperature and high-pressure compressed air cooled by the cooler 4; the turbine expander group 8 is connected with the underground gas storage pile 1 through the air output pipeline 401, and is configured to expand the normal-temperature and high-pressure compressed air, so as to drive the generator 11 to generate electricity, and the electricity generated by the generator 11 is provided to a user end.

[0130] The underground gas storage pile 1 is a large-diameter hollow pipe pile capable of storing compressed gas; the electric motor 2 is driven by off-peak power or photovoltaic / wind power to drive the compressor (group) 3 to work; the compressor (group) 3 is driven by the electric motor 2 to compress air at normal temperature and pressure in multiple stages, and the compressed gas is stored in the underground gas storage pile 1; the cooler 4 is connected with the compressor (group) 3 and is used for cooling and reducing the temperature of the gas discharged by the compressor 3; the heat accumulator 5 is in communication with the cooler 4, and is used for collecting and storing heat generated in the process of compressing air, and can be connected to the user end to provide heat energy and can supplement the reheater 9 with heat energy; the filter is used for removing impurities such as oil, dust and particulate matters in the air, so as to improve the quality of the compressed air; the air dryer is used for drying and filtering the water vapor in the compressed air, so as to avoid corrosion to the underground gas storage pile 1 and influence on the working efficiency of the turbine expander (group) 8; in this embodiment, the first filter 601 and the first air dryer 701 are arranged downstream of the cooler 4 on the main air input pipeline, the second filter 602 and the third filter 603 are arranged downstream of the first air dryer 701, the second filter 602 and the third filter 603 perform secondary filtration, so that the cleanliness of the compressed air is higher, the second air dryer 702 is arranged on the main air output pipeline, the fourth filter 604 is arranged upstream of the second air dryer 702, the fifth filter 605 and the sixth filter 606 are arranged downstream of the second air dryer 702.

[0131] The turbine expander (group) 8 releases the energy of compressed gas in a multi-stage expansion manner to drive the generator 11 to generate electricity; the reheater 9 is connected with the accumulator 5 to receive the heat provided by the accumulator 5, and the reheater 9 is used to supplement the heat required by the turbine expander (group) 8 during operation, thereby improving the operating efficiency of the turbine expander (group); the cold accumulator 10 is connected with the turbine expander (group) 8, and the cold accumulator 10 is used to collect and store the cold air released during the expansion of compressed air, and the cold accumulator 10 is connected to the user end to provide cold energy; the cold energy of the cold accumulator 10 can also be provided to the cooler 4, thereby forming a cold energy loop.

[0132] The generator 11 is driven by the high-temperature and high-pressure air released by the turbine expander (group) 8 to provide electric energy for the user end; the comprehensive control unit 12 is composed of a software system, sensors, controllers, instruments and the like, which can not only monitor the working state of the underground gas storage pile foundation energy comprehensive utilization system, but also enable the heat and cold provided by the accumulator 5 and the cold accumulator 10 to exchange heat with the heat of the user end through the heat exchange unit.

[0133] In the embodiment, the underground gas storage pile 1 is composed of a pile body 101, an embedded pipe 102, a bottom sealing body 103, and a top sealing cover 104. The pile body 101 further comprises: a grouting guide pipe 1011 embedded in the inner wall, a grouting outlet 1012 arranged at the top of the pile wall, and a grouting outlet 1013 arranged at the bottom, and welded by means of an end plate 1014. The diameter of the embedded pipe 102 can be greater than 800 mm, and the inner wall has high-pressure resistance and corrosion resistance, and can bear about 8 MPa of medium-pressure air. In an embodiment, the embedded pipe 102 is a steel pipe, and in other embodiments, the embedded pipe 102 is a flexible sleeve made of other materials, which is placed in the pile body 101 instead of the steel pipe, and preferably, the embedded pipe 102 is made of inorganic flexible airtight material or rubber which has flexibility, corrosion resistance and aging resistance.

[0134] The bottom sealing body 103 is placed on the energy storage pile bearing platform 105. The top sealing cover 104 has high pressure resistance and corrosion resistance, and has no less than three holes for air conveying pipes (air input pipe 201 and air output pipe 401) and pressure relief pipe 1041 to pass through; the main air input pipe of the air input pipe (air inlet pipe) 201 is connected with the first filter 601, the first air dryer 701, the second filter 602 and the third filter 603; the branch input pipe of the air input pipe (air inlet pipe) 201 is connected with the underground gas storage pile 1 through the first safety valve, that is, the first safety valve 504 is optionally arranged on the branch air input pipe; the main air output pipe of the air output pipe (air outlet pipe) 401 is connected with the fourth filter 604, the second air dryer 702, the fifth filter 605 and the sixth filter 606; the branch air output pipe of the air output pipe (air outlet pipe) 401 is connected with the underground gas storage pile 1 through the second safety valve 503, that is, the second safety valve 503 is optionally arranged on the branch air output pipe; the pressure relief pipe 1041 controls the discharge of gas in the underground gas storage pile 1 through the pressure relief valve 1042; and the top sealing cover 104 is fixed by the pin 1043.

[0135] The compressor (group) 3 is composed of no less than two compressors, and the outlet of each stage of compressor is connected with the cooler 4 for reducing the temperature of gas. The inlet of the regenerator 5 is connected with the outlet of the cooler 4 for recovering compression heat; the outlet of the regenerator 5 is connected with the inlet of the reheater 9 for supplementing the heat required by the reheater 9; at the same time, the regenerator 5 can also be connected with the user end for providing heat energy to the user end, thereby forming a heat energy loop.

[0136] The first filter 601, the first air dryer 701, the second filter 602 and the third filter 603 are additionally provided with the first pressure gauge 202 and the first pressure sensor 203 at the connection position with the air input pipe (air inlet pipe) 201, for measuring the pressure of the gas entering the underground gas storage pile 1; the fourth filter 604, the second air dryer 702, the fifth filter 605 and the sixth filter 606 are additionally provided with the second pressure gauge 402 and the second pressure sensor 403 at the connection position with the air output pipe (air outlet pipe) 401, for measuring the pressure of the gas released by the underground gas storage pile 1. The third pressure gauge 501 and the third pressure sensor 502 are arranged on each branch air output pipe, and are used for detecting the pressure of the compressed air released by each underground gas storage pile 1. The third pressure gauge and the third pressure sensor can timely find whether the single underground gas storage pile 1 is in normal state.

[0137] The turbine expander (group) 8 is composed of no less than two turbine expanders, and the inlet of each turbine expander is connected to the reheater 9 to supplement the heat required for the operation of the turbine expander. The outlet of the turbine expander (group) 8 is connected to the cold gas collector 10 on one hand and to the generator 11 on the other hand.

[0138] The application also provides a construction and installation method of the underground gas storage pile foundation energy comprehensive utilization system, comprising the following steps:

[0139] Step S1: manufacturing of prefabricated pipe piles;

[0140] Step S2: drilling and pile sinking;

[0141] Step S3: pile splicing;

[0142] Step S4: repeating S2 and S3 until the pile length reaches the design length or the pile end is effectively embedded in the design stratum;

[0143] Step S5: dredging and bottom sealing;

[0144] Step S6: repeating S1 to S5 until all pile foundation construction is completed;

[0145] Step S7: sealing test and pile body detection;

[0146] Step S8: installation of the top sealing cover 104;

[0147] Step S9: installation of the air input pipeline (air inlet pipe) 201 and the compressor (group) 3, the cooler 4, the regenerator 5, the first filter 601, the first air dryer 701, the second filter 602, the third filter 603, the first pressure gauge 202 and the first pressure sensor 203, i.e., the above components form a first module;

[0148] Step S10: installation of the air output pipeline (air outlet pipe) 401 and the turbine expander (group) 8, the reheater 9, the cold gas collector 10, the fourth filter 604, the second air dryer 702, the fifth filter 605, the sixth filter 606, the second pressure gauge 402 and the second pressure sensor 403, i.e., the above components form a second module;

[0149] Step S11: installation of the motor 22 and the generator 11, i.e., the above components form a third module;

[0150] Step S12: connecting each device to the comprehensive management unit 12, i.e., a fourth module;

[0151] Step S13: debugging;

[0152] Step S14: operation.

[0153] In step S1, the manufacture of the prefabricated pipe pile, including: when the pipe pile is prefabricated in the factory, the grouting pipe is embedded in the pipe wall of the pipe pile; the inner wall of the pipe pile is coated with an anticorrosive coating for anticorrosive treatment.

[0154] Preferably, the grouting pipe comprises an aluminum plastic pipe with an inner diameter of 20 mm and a wall thickness of 4 mm.

[0155] In step S2, drilling and pile sinking, including: connecting the expandable and contractible drill bit with the long auger rod and then entering the stratum to be sunk through the inner cavity of the large-diameter pipe pile; driving the drill rod to drill, and under the action of earth pressure, the drill bit expands to cause the drilled hole to have a larger diameter than the outer diameter of the pipe pile, so as to ensure that the pipe pile sinks synchronously with the drill bit under the action of zero or small pile sinking resistance; the residual soil generated by drilling is taken out to the ground through the spiral blades on the long auger rod in the inner cavity of the pipe pile.

[0156] In step S3, splicing, including: connecting the upper and lower two sections of the pipe pile by welding (argon arc welding for bottoming and electric welding for surface covering); the grouting pipes between the upper and lower two sections of the pipe pile are connected by high-strength aluminum plastic pipes, and a sealing ring is arranged between the grouting pipes and the high-strength aluminum plastic pipes for sealing.

[0157] In step S4, repeating S2 and S3 until the length of the pile reaches the designed length or the effective end of the pile is embedded in the designed stratum, further including: performing side grouting of the pile through the grouting pipe embedded in the pipe wall of the pipe pile.

[0158] In step S5, dredging and bottom sealing, including: after dredging through the cleaning hole, pouring concrete to the bottom of the hole through the pipe cavity.

[0159] In step S8, installing the top sealing cover 104, including: placing the top sealing cover 104 on the top of the pipe pile and sealing the contact part between the top sealing cover 104 and the pipe pile.

[0160] In step S9, the air input pipe (air inlet pipe) 201 and the compressor (group) 3, the cooler 4, the heat accumulator 5, the first filter 601, the first air dryer 701, the second filter 602, the third filter 603, the first pressure gauge 202 and the first pressure sensor 203, including: passing the air input pipe (air inlet pipe) 201 through the hole (air inlet) reserved in the top sealing cover 104, and sealing the hole; connecting the other end of the air input pipe (air inlet pipe) 201 with the first pressure sensor 203, the first pressure gauge 202, the third filter 603, the second filter 602, the first air dryer 701, and the first filter 601 in sequence; in addition, the cooler 4 is connected at the outlet of each stage of compressor, and the cooler 4 is connected between the last stage of compressor and the first filter 601; the inlet of the heat accumulator 5 is connected at the outlet of the cooler 4.

[0161] In step S10, the air output pipeline (air outlet pipe) 401 and the turbine expander (group) 8, the reheater 9, the cold accumulator 10, the fourth filter 604, the second air dryer 702, the fifth filter 605, the sixth filter 606, the second pressure gauge 402, and the second pressure sensor 403 are installed, including: passing the air inlet end of the air output pipeline (air outlet pipe) 401 through the hole (air outlet) reserved on the top sealing cover 104, and sealing the hole; connecting the other end of the air output pipeline (air outlet pipe) 401 to the third pressure sensor 502, the third pressure gauge 502, the second pressure gauge 402, the second pressure sensor 403, the fourth filter 604, the second air dryer 702, the fifth filter 605, and the sixth filter 606 in sequence; in addition, the reheater 9 is connected to the inlet of each stage of the turbine expander, the reheater 9 is connected between the first stage of the turbine expander and the sixth filter 606, and the inlet of the reheater 9 is connected to the outlet of the heat accumulator 5; the outlet of the turbine expander (group) 8 is connected to the inlet of the cold accumulator 10, and the outlet of the cold accumulator 10 is connected to the inlet of the cooler 4.

[0162] In step S11, the motor 2 and the generator 11 are installed, including: connecting the inlet of the motor 2 to the mains or photoelectric / wind power, and connecting the outlet of the motor 2 to the compressor (group) 3 through the first clutch A1; connecting the outlet of the turbine expander (group) 8 to the inlet of the generator 11 through the second clutch A2, and connecting the outlet of the generator 11 to the integrated management unit 12.

[0163] In summary, the underground gas storage pile foundation energy comprehensive utilization system construction and installation method can make the underground gas storage pile foundation energy comprehensive utilization system compact and simple and fast to construct through modular installation.

[0164] A large number of technical features are described in the specification of the present application, which are distributed in various technical solutions. If all possible combinations (i.e. technical solutions) of technical features of the present application are listed, the specification will be too long. In order to avoid this problem, each technical feature disclosed in the above invention content, each technical feature disclosed in the following embodiments and examples, and each technical feature disclosed in the drawings can be freely combined to form various new technical solutions (these technical solutions are considered to have been described in the specification), unless such combination of technical features is technically infeasible. For example, features A+B+C are disclosed in one example, features A+B+D+E are disclosed in another example, features C and D are equivalent technical means that play the same role, and only one of them can be used in technology, and feature E can be combined with feature C in technology. Therefore, the scheme of A+B+C+D should not be considered to have been described because it is technically infeasible, and the scheme of A+B+C+E should be considered to have been described.

[0165] All documents mentioned in this application are incorporated herein by reference in their entirety to provide additional description of the art in which this application pertains. In addition, it should be appreciated that various adaptations and modifications of the application can be accomplished using the information provided in this detailed description. Therefore, it is to be understood that within the scope of the application, numerous changes can be made by one of ordinary skill in the art without departing from the spirit and scope of the application.

Claims

1. An underground gas storage pile foundation energy comprehensive utilization system, characterized in that, The system comprises a compressed air preparation module, an underground gas pile energy storage module, a heat recycling module, and an expansion power generation module, wherein, The compressed air preparation module comprises a compressor unit (3) and a cooler (4), and is used for preparing and cooling compressed air; The underground gas pile energy storage module comprises one or more underground gas piles (1) for storing normal-temperature high-pressure compressed air; The expansion power generation module comprises a turbo-expander unit (8) for expanding the normal-temperature high-pressure compressed air to drive a generator (11) to generate electricity, and the generated electricity is provided to a user end; The heat recycling module is used for recycling heat and cold generated in the air compression process or the expansion process. The system comprises an intelligent integrated management unit for monitoring and optimizing system operation.

2. The system of claim 1, wherein, The system further comprises a reheater (9), the heat recycling module comprises a heat accumulator (5) connected with the cooler (4) for recycling heat generated in the air compression process, and the reheater (9) is connected with the heat accumulator (5) and is used for heating the normal-temperature high-pressure compressed air again before expansion.

3. The system of claim 2, wherein, The heat recycling module further comprises a cold accumulator (10) connected with the turbo-expander unit (8) for absorbing and storing low-temperature cold generated by expanding the normal-temperature high-pressure air, and the cold accumulator (10) is also connected with the cooler, so that the low-temperature cold is transferred to the cooler (4), thereby forming a closed loop cycle of heat and cold energy.

4. The system of claim 3, wherein, The underground gas pile (1) comprises a pile body (101), an embedded pipe (102), a bottom sealing body (103), and a top sealing cover (104), the bottom sealing body (103) and the top sealing cover (104) and the pile body (101) together define a sealed space, and the embedded pipe (102) is arranged in the sealed space and is used for storing normal-temperature high-pressure compressed air.

5. The system of claim 4, wherein, A heat exchange loop is arranged between the system and surrounding rock-soil, the heat exchange loop comprises heat exchange pipes or heat exchange members in close contact with the rock-soil, so that cold and heat in the system can be exchanged with the rock-soil, thereby achieving auxiliary storage and adjustment of heat or cold.

6. The system of claim 5, wherein, The heat exchange loop is connected with the heat recycling module, and the intelligent integrated management unit dynamically schedules the transfer of heat and / or cold among the pile body (1) of the underground gas pile (1), the rock-soil, the heat accumulator (5), and the cold accumulator (9), so as to achieve auxiliary supply of building cold and heat load or adjustment of peak-valley heat and / or cold.

7. The system of claim 6, wherein, The method comprises the following steps:

8. A method for constructing and installing the underground gas pile foundation energy comprehensive utilization system according to claims 1-7, characterized in that, Step S1: manufacturing of prefabricated pipe piles; Step S2: drilling and pile sinking; Step S3: pile splicing; Step S4: repeating S2 and S3 until the pile length reaches the design length or the pile end is effectively embedded in the design stratum; Step S5: dredging and bottom sealing; Step S6: repeating S1 to S5 until all pile foundation construction is completed. ​ Step S7: sealing test and pile detection; Step S8: installation of top sealing cover; Step S9: installation of air input pipeline (201), compressor set (3), cooler (4), heat accumulator (5); Step S10: installation of air output pipeline (401) and turbine expander set (8); Step S11: installation of motor (22) and generator (11); Step S12: connection of each device to intelligent integrated management and control unit (12); Step S13: debugging; Step S14: operation.

9. The method of claim 8, wherein, In step S3, the connecting pile comprises: the upper and lower two-section pipe piles are connected by welding, the grouting pipes between the upper and lower two-section pipe piles are communicated through high-strength aluminum plastic pipes, and sealing rings are arranged between the grouting pipes and the high-strength aluminum plastic pipes for sealing.

10. The method of claim 8, wherein, In step S10, a reheater (9) and a cold accumulator (10) are further installed.

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