105 results about "Liquid air" patented technology

The invention relates to the technical field of plant-level monitoring systems, in particular to a multi-source heterogeneous system and method for plant-level monitoring based on liquid air energy storage. According to the technical scheme, the method comprises the following steps of S1, collecting and preprocessing multi-source heterogeneous data in real time; s2, constructing a cross-system equipment graph; s3, formulating a hierarchical response intelligent strategy; s31, making a topological graph; s32, according to a hierarchical response strategy, dynamic adjustment is carried out according to the severity degree and the propagation range of the alarm; s33, calculating a weight; and S34, dividing response levels according to the weights. Multi-source heterogeneous data real-time acquisition and preprocessing can align millisecond-level and second-level data streams and eliminate time sequence errors, so that the system alarm association accuracy is improved, six system data formats are unified through JSON structured conversion, the analysis error rate can be reduced, and a basis is provided for large-scale monitoring; a three-flow topology model is established, a key equipment network is constructed, the root cause positioning time is shortened, and the false alarm rate is reduced through a topology weight optimization mechanism.

Pure liquid nitrogen, liquid air or dirty liquid nitrogen generated by a rectifying tower of the air separation device is subjected to secondary pressurization through a hydraulic pump and then enters a main heat exchanger or a recooling device to recover cold energy, and high-pressure gas formed by heat absorption and gasification enters a high-pressure expansion machine to expand and do work; exhaust gas of the high-pressure expansion machine enters the rectifying tower to provide cold energy required by air separation, and pure nitrogen, waste nitrogen and pure oxygen which are discharged from the rectifying tower and are subjected to cold energy recovery through the main heat exchanger are output. The purposes of energy conservation and consumption reduction of the air separation device are achieved through the processes of primary pressurization of the compressor, secondary pressurization of the hydraulic pump, cold returning, gasification and expansion.

The application discloses a helium low-temperature purification pressure building device and a pressure building method, which comprise a flash evaporation unit, a purification unit and a heat recovery unit connected in sequence. In the application, the product gas of the liquid air separator is used to build pressure for the adsorber under the regeneration pressure building in the high-pressure working state, so that the adsorber under the working state is prevented from charging pressure for the adsorber under the regeneration pressure building and the pressure of the adsorber under the working state is prevented from being lost. Since the pressure difference between the liquid air separator and the adsorber under the regeneration pressure building is large, the high-pressure impact is easy to cause the damage of the equipment, the pressure building process is arranged in the purification process, the time required for the pressure building is reduced, the adsorber under the working state is saturated, the adsorber under the regeneration state is built in pressure, automatic switching can be realized, the continuous production of the product high-purity helium gas is realized, and the use demand of the high-purity gas is met.

A liquid air energy conversion system is provided that integrates three subsystems or unit operations, namely a deep sub-ambient gas compression subsystem, a power expansion and heat recovery subsystem, and an external heat source.

The invention provides a charge and discharge control method and system for a liquid air energy storage ship based on a neural network, and relates to the technical field of energy storage ships, and the method comprises the steps: generating a control instruction of a corresponding link based on a final time node decision outputted by a neural network model; executing the control instruction, namely controlling the open sea liquefied air equipment to start or stop liquid air preparation at the final preparation time node; controlling the ship to start navigation at the final transportation start navigation time node; controlling the port gasification power generation device to start or stop power generation at the final energy release power generation time node; and in the process of liquid air preparation, ship transportation or port energy release power generation, monitoring the change of multi-source real-time data in real time, and inputting the changed data into the neural network model again so as to dynamically adjust and update the final time node decision. According to the method, the maximization of the comprehensive benefit of operation is realized, the value window of the peak period of the power grid can be accurately captured and responded, and low-efficiency or invalid discharge is avoided.

The invention discloses a new energy off-grid green, hydrogen and ammonia production integrated system coupled with liquid-air energy storage and power generation, and relates to the technical field of new energy comprehensive utilization and chemical production. A wind-light-electricity new energy power generation module converts wind energy and solar energy into electric energy, and a liquid air energy storage module stores energy through air compression-liquefaction-expansion; the hydrogen production module utilizes electric energy to electrolyze water to produce hydrogen, the air separation module produces nitrogen and supplies the nitrogen to the ammonia production module, and the ammonia production module reacts hydrogen and nitrogen to synthesize green ammonia. The problems of intermittency and instability of new energy power generation are effectively solved, integrated production of green hydrogen and green ammonia under the off-grid condition is achieved, dependence on traditional energy and external infrastructures is reduced, the production cost and carbon emission are reduced, and the energy utilization efficiency is improved; meanwhile, the circulating system of the ammonia production module improves the utilization rate of raw materials and improves the economic benefits of the system.

The application discloses a kind of solar energy cascade utilization liquid air energy storage system and its operating method, the system includes liquid air energy storage system, photo-thermal power generation system and organic rankine cycle power generation system.In the low valley of electricity and light, photo-thermal power generation system generates electric energy, part is used to drive liquid air energy storage subsystem for supply load.The system uses air liquefaction and expansion cycle to realize energy storage, and converts excess electric energy into liquid air storage.In the peak of electricity, the system releases energy, and produces electric energy by gasification and expansion liquid working medium, and uses photo-thermal heat in the form of series, parallel heat exchange to heat working medium, realizes energy cascade utilization, solves the problem of low efficiency of expander when liquid air releases energy.The system can make full use of the peak shaving potential of liquid air energy storage, organically combines the thermal energy and electric energy of photo-thermal system, is conducive to improving overall energy conversion efficiency, realizes all-weather renewable energy utilization.

The embodiment of the invention discloses a liquid feeding air separation device which comprises a rectifying tower, a liquid feeding device, a liquid feeding device, a liquid feeding device, a liquid feeding device and a liquid discharging device, and the middle of the rectifying tower is provided with a liquid air feeding port; the condensing evaporator is arranged at the bottom of the rectifying tower; wherein liquid air enters the rectifying tower from the liquid air feed port to be rectified, liquid oxygen is obtained at the tower bottom, nitrogen is led out from the tower top of the rectifying tower and led into the condensation evaporator after being pressurized and cooled, liquid nitrogen flowing out of the condensation evaporator is divided into two strands, one strand serves as reflux liquid of the rectifying tower, and the other strand is led out. According to the technical scheme, liquid air is used as feed, nitrogen at the top of the tower is pressurized and cooled and then is introduced into the condensation evaporator, then heat exchange is carried out on the nitrogen and liquid oxygen at the bottom of the rectifying tower, and therefore rectification is achieved, and the air separation equipment with the liquid air as the raw material is provided.

This application provides a liquid air supply system for breathing air, comprising: a liquid air storage tank, a high-pressure vaporization pump, a high-pressure vaporizer, a nitrogen input module, a buffer mixing module, an oxygen content detection module, and a control terminal; the high-pressure vaporization pump has a liquid inlet and a liquid outlet; the buffer mixing module has an air inlet and an air outlet; the liquid inlet of the high-pressure vaporization pump is connected to the liquid air storage tank, and the liquid outlet is connected to the high-pressure vaporizer; both the high-pressure vaporizer and the nitrogen input module are connected to the air inlet of the buffer mixing module, and the air outlet of the buffer mixing module is used to connect to the main gas supply pipe; the gas detection module detects the input gas data and output gas data of the buffer mixing module, and the control terminal controls the amount of nitrogen input from the nitrogen input module to the buffer mixing module based on the input gas data and the output gas data, enabling the safe and long-term output of air with the required oxygen content.

This invention belongs to the technical field of energy storage systems. To further improve the efficiency and peak-shaving flexibility of energy storage systems, a liquefied air energy storage system coupling hydrate cooling, air separation, and liquefied natural gas is proposed. In the energy storage phase, the liquefied air energy storage system compresses and heats air. After expanding to atmospheric pressure, the liquefied air enters a gas-liquid separator. The separated gaseous air serves as return air to provide cooling energy, while the separated liquid air is stored in a liquefied air tank. The cooling energy for air cooling is provided by the return air, liquefied natural gas, and circulating hydrates. In the energy release phase, a portion of the liquid air in the liquefied air tank is pressurized and enters a distillation unit for air separation, producing liquid nitrogen and liquid oxygen. The remaining liquid air is used for power generation. The heating fluid is provided by circulating hydrates. This invention improves the system's economic efficiency and overall energy utilization efficiency.

The invention provides an energy storage type air separation system and method based on direct rectification of liquid air and cold energy recovery of waste nitrogen, the system mainly comprises an air compression and purification unit, an air liquefaction unit and an air separation unit, and in the off-peak period of a power grid load, the system cooperatively operates the processes of compression and purification, liquefaction and separation; nitrogen, oxygen and crude argon are produced while liquid air is prepared, and air liquefaction is assisted by means of cold energy released by the cold storage packed bed; in the peak period of power grid load, the air compression and purification process is operated in a low-load mode, liquid air is directly supplied to the rectification process, part of cold energy of low-temperature waste nitrogen is stored in a cold storage packed bed, and stable and continuous supply of gas products is ensured. By implementing a time-sharing operation strategy and combining an efficient cold energy recovery mechanism, the energy consumption and operation cost of the air separation system can be remarkably reduced, the peak regulation capacity of a system power grid is enhanced, the gas separation efficiency is improved, cyclic utilization of cold energy is achieved, and the liquefaction rate and the operation economical efficiency are further improved.

The application discloses a kind of mine local ventilation and cooling system methods based on liquid air, it is related to mine environment control technical field, including intelligent conveying pipeline, intelligent multi-mode release device, air purification and energy recovery device and mine environment adaptive monitoring and control system;The intelligent conveying pipeline includes multilayer composite insulation structure and intelligent control module, the intelligent control module includes temperature sensor, pressure sensor and flow sensor, for real-time monitoring and adjusting the delivery state of liquid air;The intelligent multi-mode release device includes the intelligent release device of plasma vaporization, ultrasonic nanometer atomization and vortex synergistic function, the efficient conversion and accurate distribution of liquid air from storage to working face are realized by the steps of the application through intelligent multi-mode release device, according to mine environment parameter real-time adjustment air velocity and direction, ensure the uniform distribution and local cooling effect of fresh air, improve the air quality of work area.

The invention discloses an accurately-filled liquid air energy storage rock breaking method which comprises the following steps: monitoring the flow of liquid air by adopting a clamping type ultrasonic flowmeter, and updating the injection amount in real time; a pressure sensor, an oxygen concentration sensor and a temperature sensor are adopted for liquid air leakage monitoring; the air volume can be monitored through the oxygen concentration change and the sensor, and the liquid air volatilization amount is calculated; performing pressure and temperature correction on the volume of the volatile gas, and calculating a volatilization rate; based on the liquid air injection amount and the volatilization amount, the liquid air storage amount in the blast hole is accurately calculated; data of all sensors are uniformly collected and summarized to a control center, and an embedded system is established to realize real-time data storage and processing; and when temperature sudden change or pressure abnormity is monitored, warning is performed, and transmission of liquid air is automatically closed. The device is used for the working conditions of water conservancy and hydropower, traffic, mine and other industries needing to pay attention to environmental protection, crushing effect and control degree, so that the liquid air energy storage rock breaking efficiency is improved.

The invention relates to the technical field of energy storage, and discloses a slurry air energy storage system and method, a tower type storage tank is matched with a heating auxiliary unit, the air liquefaction process is optimized, the conversion loss of unliquefied gas-state air is reduced, and the liquefaction efficiency is improved. And meanwhile, the heat storage unit and the organic Rankine cycle unit cooperate with the air compression and gasification energy release unit, efficient recovery and gradient utilization of energy are achieved, and the comprehensive energy storage efficiency and peak regulation response flexibility of the system are improved. Low-temperature slurry storage is achieved by converting liquid air into slurry air, the energy storage quality and the energy capacity in unit volume can be remarkably improved, and the core problems that in an existing energy storage technology, the energy storage density is low, and the energy storage capacity in the unit volume is insufficient are effectively solved.

The present application relates to the technical field of energy, in particular to a liquid air energy storage gas turbine system and method, the system is composed of four parts of gas subsystem, gas turbine subsystem, liquid air gasification air intake subsystem and waste heat utilization subsystem, and is integrated into a replaceable gas turbine compressor, and releases the work of the gas turbine system for power generation which is distributed to the compressor about 2 / 3 of the turbine, further tapping the utilization value of liquid air energy storage, which can realize the coordinated control of gas subsystem, liquid air gasification air intake subsystem and waste heat utilization subsystem on each operating condition of gas turbine subsystem, solve the integration and operation control problem of liquid air energy storage device replacing compressor and gas turbine, the system focuses on the comprehensive utilization of system waste heat resources, compared with the existing system, the total energy utilization efficiency, system economy, system stability and reliability of the system are greatly improved, which will play a greater role in flexible regulation, climbing ability and inertia support in the construction of new power system with new energy as the main body.

The application discloses a kind of based on liquid air energy storage combined heat and power unit start-stop peak shaving system and system minimum capacity configuration method, including the coal-fired generating unit for producing electric energy, the electric energy for accommodating coal-fired generating unit and the electric energy is changed into heat and liquid air storage unit for storing liquid air energy storage unit and using coal-fired generating unit provided by heating extraction steam and the surplus compressed heat provided by liquid air energy storage unit carries out external heating civil heating unit, and the high-pressure equipment of liquid air energy storage unit is connected in the power generation end of coal-fired generating unit, and civil heating unit is connected with liquid air energy storage unit and coal-fired generating unit respectively;The civil heating unit is connected with heating pipe network.The application can not only guarantee heating, but also realize start-stop peak shaving function, with minimum capacity configuration, reduce system redundancy, and reduce initial investment.

The utility model discloses a kind of based on liquid air energy storage's cogeneration unit start-stop peak shaving system, including the coal-fired generating unit for producing electric energy, the electric energy of the coal-fired generating unit for consumption is changed into heat and liquid air storage unit and the civil heating unit for carrying out external heating using the heating extraction steam provided by the coal-fired generating unit and the surplus compressed heat provided by liquid air energy storage unit, the high-pressure equipment of liquid air energy storage unit is connected at the power generation end of the coal-fired generating unit, and the civil heating unit is connected with liquid air energy storage unit and the coal-fired generating unit respectively.The utility model is based on guaranteeing the maximum heating load of external network of cogeneration unit, to configure minimum capacity liquid air energy storage system to realize start-stop peak shaving, both can guarantee heating, and can realize start-stop peak shaving function, simultaneously with minimum capacity configuration, reduce system redundancy, reduce initial investment.

The invention relates to the technical field of direct air carbon capture and photovoltaic power generation, in particular to a direct air carbon capture and photovoltaic power generation integrated carbon capture-photovoltaic-hydrogel system which comprises a photovoltaic module and a porous liquid direct air carbon capture system, and at least one hydrogel layer is arranged along the back of the photovoltaic module; a porous guide plate and a heat insulation layer are sequentially arranged along the bottom of the photovoltaic module; the heat insulation layer covers the outer side of the porous flow guide plate, and an environment isolation belt is formed on the outer side of the porous flow guide plate; a water collector and a water storage device are arranged along the bottom of the heat insulation layer; moisture captured from the air is absorbed into the hydrogel layer. By matching with a photovoltaic panel, good operation of a photovoltaic-hydrogel system integrating power generation and atmospheric water collection is realized, the problem that the photovoltaic panel is accelerated to age when encountering high temperature is solved, the power generation efficiency and sustainable use capability of the photovoltaic panel are improved, and the direct porous liquid air carbon capture device is driven to start.

The application provides a controllable nuclear fusion helium cryogenic system coupled with liquid air energy storage, belonging to the cross field of controllable nuclear fusion device cryogenic technology and large-scale energy storage technology, comprising an energy storage subsystem, an energy release subsystem, an 80K helium gas circulation subsystem, a cooling oil subsystem and a cold supplementing subsystem; the energy storage subsystem is used for liquefying ambient air and storing the ambient air in a liquid air storage tank, and shares multiple heat exchangers with the 80K helium gas circulation subsystem; the energy release subsystem takes liquid from the liquid air storage tank and exchanges heat with the 80K helium gas circulation subsystem; the 80K helium gas circulation subsystem drives helium gas through a cold compressor to ensure continuous cooling of a superconducting magnet cold shield; the cooling oil subsystem is used for cooling compressed air of the energy storage subsystem; and the cold supplementing subsystem is a closed inverse Brayton cycle, and cold energy of the cold supplementing subsystem is used for re-liquefying main air flow to compensate for system cold energy loss. The application provides a passive cold energy backup structure for the 80K cryogenic system, which does not depend on power grid power supply.

A system and method for the liquefaction and densification of oxygen for use in space vehicle applications is provided that uses high pressure air or synthetic air as the refrigerant source. The disclosed system and method employs a heat exchanger arrangement comprising a first heat exchange device configured to liquefy the high pressure gaseous oxygen stream and at least a portion of the high pressure gaseous air stream via indirect heat exchange with a refrigerant stream to yield a liquid oxygen stream and a liquid air stream. The heat exchanger arrangement also includes a second heat exchange device configured to densify the liquified oxygen stream via indirect heat exchange with the liquid air stream which yields the densified liquid oxygen and a cold vaporized air stream. The refrigerant stream comprises a mixture of the exhaust streams from one or more turbines with the cold vaporized air stream.

The utility model relates to garbage can inner bag manufacturing equipment technical field, and disclose a kind of injection mould rapid cooling's garbage can inner bag manufacturing equipment, including base and fixedly installed lower die holder on the upper end of base, the upper end of lower die holder is installed with upper die holder, cooling structure is installed on the lateral wall of lower die holder and upper die holder, injection liquid is introduced from injection port, using the cooperation of mould core and mould cavity can be shaped to injection liquid, the heat conduction layer of cooperation arrangement is favorable to the heat dissipation of mould core, in the process, start suction pump, and cooperate with duct and suction pipe can be drawn into cooling channel, can realize the purpose of air cooling, start a group of pump body simultaneously, and cooperate with water cooling pipe and circulating pipe can extract cooling liquid in water tank to cooling cavity, can carry out cooling to injection liquid, can realize the cooperation cooling of injection liquid air cooling and water cooling, shorten the forming time of injection liquid, effectively improve production efficiency.

An air freshener (1) comprises a container (2) comprising a base (3) and a first opening (4), the container (2) extending axially between the base (3) and the first opening (4) defining a cavity (5) adapted to contain a liquid air freshener composition; the air freshener (1) comprises a lid (6) that can be attached to and detached from the first opening (4) of the container (2); the air freshener (1) further comprises an absorbent element (10) connected in one piece with the lid (6) and inserted into the cavity (5) of the container (2) to impregnate the liquid air freshener composition; by detaching the lid (6) from the first opening (4), the absorbent element (10) can be at least partially extracted from the cavity (5) through the first opening (4) to allow the liquid air freshener composition to evaporate from the absorbent element (10);The lid (6) comprises a body (7) comprising a second opening (8) in fluid communication with the cavity (5) of the container (2) when the lid (6) is coupled to the container (2); the body (7) has a lower portion (61) where it is coupled to the first opening (4) and an upper portion (62); the body (7) comprises a base (15) positioned on the upper portion (62), from which the second opening (8) extends axially away from the base (15); the lid (6) further comprises a cover (9) positioned on the upper portion (62) to close the second opening (8) and removable to allow access to the second opening (8); the second opening (8) comprises connection means (11) configured to reversibly couple the second opening (8) with a capsule (12) configured to carry out a refill of the liquid air freshener composition.

The invention relates to the field of energy storage technology and big data application cross technology, in particular to a liquid air energy storage power station dynamic simulation system and method based on big data. According to the technical scheme, the system comprises a data acquisition and preprocessing module, a big data driving monomer module, a multi-scene system simulation module, a simulation analysis and optimization module and a simulation parameter storage module. The simulation system can reflect the actual operation state of the liquid air energy storage power station under the influence of dynamic factors such as environment change, load fluctuation and equipment aging in real time, so that the simulation result is more consistent with the actual condition, and a more reliable basis is provided for the design, operation and management of the power station; and a high-performance parallel simulation engine is adopted to analyze possible problems and risks, so that a coping strategy is formulated in advance, and the operation risk is reduced. According to the invention, safe and stable operation of the power station is ensured, effects of different response schemes can be rapidly simulated in case of power grid emergency situations, and loss caused by decision delay is reduced.

The application discloses a kind of liquid air energy storage systems of thermal power generating unit thermal coupling operation method, based on and the original fire power generating system connection of thermal power generating unit liquid air energy storage system, wherein, liquid air energy storage system includes air compression liquefaction subsystem, liquid air expansion power generation system and cold and hot circulation subsystem, cold and hot circulation subsystem includes high-temperature compression heat storage module, low-temperature compression heat coupling regenerative system module, cold storage module and industrial steam high-temperature heat storage module;The method includes the following scene under the operation method: A. coupling thermal power generating unit deep peak shaving operation method;B. joint thermal power generating unit peak operation method;C1. joint thermal power generating unit deep peak shaving operation method under heating condition;C2. joint thermal power generating unit peak operation method under heating condition.The application solves the problem that the present thermal power generating unit is coupled with liquid air energy storage and is complex, and the original operation mode of thermal power generating unit is greatly influenced, and the efficiency of liquid air energy storage system is improved.

This invention provides a liquid air energy storage system coupled with an air separation device, relating to the field of energy storage technology. The liquid air energy storage system with coupled air separation device includes an air compressor, a cold storage device, a liquid air tank, a distillation unit, a heating unit, and an expander unit. The air compressor is used to compress air; the cold storage device is connected to the air compressor. By connecting the cold storage device to the distillation unit, nitrogen and waste nitrogen produced by the distillation unit can be used to supplement the cooling of the cold storage device, thereby reducing the size of the cold storage device; liquid air produced during off-peak electricity pricing periods can be used directly to supplement the cooling of the distillation unit, reducing the operating cost of the distillation unit; and exhaust gas from the expander unit can be used to provide clean air to the distillation unit, reducing energy loss. The liquid air energy storage system provided by this invention has superior economic performance and a high comprehensive utilization rate of liquid air, broadening the application scenarios for liquid air energy storage systems.

An integrated gas turbine cycle and liquid air energy conversion system is provided that utilizes very high pressure air stream(s) produced from vaporization of a supercritical liquid air against a low pressure cryogenic gas. The cooled, low pressure cryogenic gas is then cold compressed to yield a moderate pressure cryogenic gas stream(s). Both the very high pressure air stream(s) and the moderate pressure air stream(s) are warmed in the flue gas heat exchanger associated with the gas turbine cycle. A source of electrical power is produced from the expansion of combustion gas in a gas turbine while auxiliary sources of electrical power are produced from the turbine expansion of the warmed very high pressure air streams and moderate pressure cryogenic gas streams. The combustion gas includes a moderate pressure supplemental stream originating from the supercritical liquid air or from the cold compressed cryogenic gas.

The invention discloses a liquid air energy storage system, which relates to the technical field of liquid air energy storage, and comprises a compressor, a heat storage heat exchanger, a precooler, a first heat exchanger, a second heat exchanger, a throttle valve, a gas-liquid separator and a first ejector, to-be-liquefied air exhausted by the precooler is subjected to heat exchange and cooling in sequence through the first heat exchanger and the second heat exchanger and adiabatic expansion through the throttling valve to reach the gas-liquid separator, the gas-liquid separator is used for separating liquid air and gaseous air, at least part of the gaseous air is conveyed to the first ejector, and at least part of the gaseous air is conveyed to the second ejector. Part of to-be-liquefied air exhausted by the first heat exchanger is conveyed to the first ejector, and first return exhaust air exhausted by the first ejector is conveyed to the air inlet side of the compressor after being subjected to heat exchange through the second heat exchanger. According to the liquid air energy storage system, the loss in the system operation process is reduced, and the energy utilization rate and conversion efficiency of the system are improved.

The utility model relates to a kind of hierarchical optimization formula cryogenic fractionation nitrogen-making equipment applied to nitrogen-making equipment field, including coarse separation tower, the upper end of coarse separation tower is equipped with condensing evaporator and four support legs, the upper end of four support legs is fixedly connected with fine separation tower in common, coarse separation tower and condensing evaporator are communicated, condensing evaporator and fine separation tower are fixedly connected with oxygen-rich pipe and liquid oxygen pipe, the right end of coarse separation tower is equipped with liquid pump, the upper and lower ends of liquid pump are fixedly connected with liquid air pipe, by being arranged between upper and lower tower condensing evaporator, reduce the floor area of this nitrogen-making equipment, and by condensing evaporator is used as the condenser of coarse separation tower and the reboiler of fine separation tower, reduce the energy consumption of equipment, when fractionating, gas passage forced gas rotation, force gas to separate under the action of centrifugal force, air inlet is not prone to block, and there is no elastic adjusting component, so that tower plate is not prone to jamming phenomenon when fractionating, effectively improve nitrogen fractionation effect.

The application belongs to the technical field of energy conversion and energy storage, and discloses an air-CO2 heat exchange system coupling liquid air and dry ice CO2 energy storage. The system is coupled through an air passage and a CO2 loop, and high-efficiency heat exchange of the two is realized in the energy storage / discharging process. Main components include air and CO2 energy storage modules, discharging modules, cold accumulators, CO2 condensers, dry ice sublimation beds and CO2-air heat exchangers. When discharging, high-pressure CO2 after discharging enters the CO2 condenser, countercurrently exchanges heat with sprayed liquid air, and is condensed into dry ice for storage; after the liquid air is heated and gasified, it enters the air discharging module through the cold accumulator to expand and generate power. When storing energy, the stored dry ice exchanges heat with CO2 gas in the sublimation bed to sublimate, and low-temperature CO2 gas is generated, which exchanges heat with compressed high-pressure air in the CO2-air heat exchanger, so that the air is cooled and liquefied for storage, and the CO2 gas is heated and compressed into high-pressure CO2 for storage.