465 results about "Liquid air" patented technology

The invention relates to the field of liquid air energy storage, and discloses a liquid air energy storage and liquefied natural gas coupling efficient power generation device and method. The method comprises the steps that an air liquefaction circulation loop purifies, compresses and cools ambient air and then expands and decompresses the ambient air to obtain liquid air, and the liquid air is transmitted to an air power generation circulation loop; generated air compression heat is stored in the heat storage unit; the air power generation circulation loop generates power through expansion of received liquid air, and generated cold energy is stored in a cold storage unit; the LNG vaporization supply loop pressurizes, evaporates and gasifies liquefied natural gas and then supplies the liquefied natural gas to a user side, generated cold energy is stored in a cold storage unit or directly supplied to the air liquefaction circulation loop, and meanwhile gaseous natural gas naturally released by an LNG tank is collected and conveyed to a combustion chamber. The high-grade heat energy utilization loop conducts heat conduction oil circulation, low-grade heat energy and high-grade natural gas combustion heat energy of the heat storage unit are recycled in sequence, high-grade heat energy is transmitted to the air power generation circulation loop, and heat conduction oil returns to the initial state to continue circulation after releasing the heat energy.

The utility model discloses a liquid air energy storage system coupled with LNG (Liquefied Natural Gas) cold energy. The liquid air energy storage system comprises an air compression unit, an air purification unit, an air liquefaction unit, a liquid air storage unit, a liquid air boosting gasification unit, an air expansion power generation unit and an LNG cold storage and nitrogen heat exchange unit, the LNG cold storage and nitrogen heat exchange unit uses nitrogen as a circulating medium to absorb the cold energy of the low-temperature end of LNG in the energy storage process to provide cold energy for air liquefaction of the air liquefaction unit, and in the energy release process, the cold energy of the low-temperature end of the LNG is used for pre-cooling compressed air extracted by an expansion machine of the air expansion power generation unit through low-temperature nitrogen. The pre-cooled compressed air is re-liquefied and stored by adopting a process technology for recovering the cooling capacity of an evaporator of a liquid air boosting gasification unit; the LNG cold storage and nitrogen heat exchange unit uses an ethylene glycol aqueous solution as a circulating coolant to absorb the cold energy of the LNG high-temperature end for cooling system equipment. The device is low in power consumption and high in liquefaction rate and electricity-electricity energy storage efficiency after air throttling.

The invention provides a liquid air energy storage system and method for coupling LNG and an air separation device, and relates to the technical field of energy storage. The liquid air energy storage system coupling the LNG and the air separation device comprises an LNG tank body, an air compression device, a main heat exchanger, a nitrogen circulation device, a liquid air storage tank, a rectification device and a power generation device. Circulating nitrogen is adopted as a heat exchange intermediate medium, so that the temperature zones of the liquefied natural gas vaporization process and the compressed air cooling process are matched, the liquefied natural gas is isolated from the compressed air, and the safety of the system is guaranteed. By adjusting the system flow, on the premise that the vaporization process of the liquefied natural gas is not affected, the air separation subsystem can absorb the cold energy of the liquefied natural gas in the peak period, a cold storage unit of the LNG-LAES is omitted, and the oxygen production energy consumption is effectively reduced. By adjusting the operation load of the air separation subsystem, the multi-cogeneration system can effectively cope with seasonal fluctuation of the vaporization amount of the liquefied natural gas, and the peak regulation capacity of the system is enhanced.

The invention discloses a new energy system for efficient ventilation, cooling and comprehensive utilization of a heat damage mine, and relates to the technical field of ventilation and cooling of the heat damage mine, the new energy system comprises a liquid air energy storage power station, a liquid air conveying pipeline system arranged in a liquid air conveying stratum drill hole, and an underground liquid air storage and conveying system arranged in an underground chamber of a mine area; the liquid air conveying pipeline system is used for connecting the liquid air energy storage power station and the underground liquid air storage conveying system; the underground liquid air storage and conveying system comprises an underground liquid air storage station and an underground liquid air conveying system; the underground liquid air storage station is used for storing liquid air; and the tail end of the underground liquid air conveying system is communicated with the underground mining area and is used for ventilating, cooling and comprehensively utilizing energy for the underground mining area. The efficiency of a traditional ventilation and cooling process is improved, the means of using liquid gas for industrial production underground is added, the energy consumption cost of mine production is greatly reduced, and the effects of energy storage and efficiency improvement can be provided for a ground power supply system.

The invention relates to the technical field of liquid air energy storage, and discloses a liquid air energy storage coupling system. The liquid air energy storage coupling system comprises a liquid air energy storage subsystem and a biomass gasification subsystem. The liquid air energy storage subsystem comprises a compressor unit, a heat storage unit, a cold storage unit and a turbine unit. And the biomass gasification subsystem comprises a biomass gasification furnace. And an air inlet of the heat storage unit is communicated with an air outlet of the air compressor unit. And the cold storage unit communicates with the heat storage unit. An air outlet of the heat storage unit communicates with an air inlet of the turbine unit and is used for conveying high-temperature air to the turbine unit, the high-temperature air enters the turbine unit to drive the power generator to generate power, and an air outlet of the turbine unit is used for discharging cooled air. And a gasifying agent inlet of the biomass gasifier is communicated with an air outlet of the turbine unit. Resource utilization of clean air at the outlet of the liquid air energy storage system can be achieved, and the system efficiency of the liquid air energy storage system is improved.

The invention relates to a liquid air energy storage and terrestrial heat coordinated underground space air regulation and control system and method. Comprising a first-stage compressor, a second-stage compressor, a third-stage compressor, an expansion refrigerator, a first-stage compression heat exchanger, a second-stage compression heat exchanger, a third-stage compression heat exchanger, a cold box, a separator, a liquid air storage tank, a cryogenic pump, an evaporator, a cold storage circulating pump, a cold storage box, a compression heat exchange circulating pump, a compression heat storage box, a first heater, a second heater and a third heater. The system comprises a first air expander, a second air expander, a third air expander and a generator. The regeneration heater is used for guiding the compression heat generated by the compressor into the regeneration heater for regeneration and / or guiding the geothermal energy output by the geothermal energy output end into the regeneration heater for regeneration; the rotary wheel dehumidification device is used for performing cryogenic drying on the wet air; the fresh air processing unit is composed of a fresh air filter, a regeneration fan, a regeneration filter and an air supply fan.

The invention relates to the technical field of converters. In view of the problem of poor heat dissipation of an energy storage converter in the related technology, the invention provides an energy storage converter, which comprises a cabinet having a first installation area and a second installation area which are oppositely arranged; the first mounting area and the second mounting area are provided with air ducts which are communicated with each other; the functional component is arranged in the first mounting area; the power module is arranged in the second mounting area; the liquid cooling plate is arranged on the power module so as to cool the power module; the liquid air heat exchanger is arranged in the first mounting area; the liquid air heat exchanger is connected with the liquid cooling plate and forms an air cooling circulation loop with the air duct; and the fan is arranged in the first mounting area and is used for driving air in the air duct to flow. According to the energy storage converter, mutual interference between the power module and the functional assembly can be avoided, so that the working environment of the energy storage converter is improved, and the energy storage converter works more smoothly; and meanwhile, a modular layout mode is adopted, so that the overall heat dissipation effect is better.

The utility model discloses a liquid air energy storage system which comprises an air compression unit, an air purification unit, an air liquefaction storage unit, an air expansion power generation unit, a cold storage unit and a heat storage unit. The air compression unit, the air purification unit and the air liquefaction storage unit are sequentially connected through an air liquefaction circulation pipeline, compression heat energy generated in the air compression process is stored to the heat storage unit through a heat storage circulation pipeline, and cold energy of the cold storage unit is transmitted to the air liquefaction storage unit through a cold storage circulation pipeline; the air liquefaction storage unit and the air expansion power generation unit are connected through an air power generation circulation pipeline, compression heat is transmitted to the heat storage unit through a heat storage circulation pipeline, and cold energy generated in the evaporation and gasification process is transmitted to the cold storage unit through a cold storage circulation pipeline. Compared with a conventional liquid air energy storage system, the liquid air energy storage system has higher power conversion efficiency and air liquefaction efficiency through one-stage or multi-stage expansion self-pressurization circulation, and is beneficial to improving the system stability and the system power generation capacity.

The invention discloses a solid-phase and liquid-phase double-coupled liquid air energy storage and cold storage system. Comprising an air liquefaction storage module used for cooling, liquefying and storing compressed air, a liquid phase cold storage / release module used for storing and releasing high-quality cooling capacity of liquid air, and a solid phase cold storage / release module used for storing and releasing medium-low-quality cooling capacity of the liquid air. The liquid phase cold storage / release module and the solid phase cold storage / release module are connected to the rear end of the air liquefaction storage module in series, and heat exchange is conducted between the liquid phase cold storage / release module and the air liquefaction storage module and between the solid phase cold storage / release module and the air liquefaction storage module. And an outlet pipeline of the solid-phase cold storage / release module is connected to the heater. High-quality cooling capacity in the power generation process of the liquid air energy storage system is stored in a liquid-phase cold storage mode, medium-low-quality cooling capacity in the power generation process of the liquid air energy storage system is stored in a solid-phase cold storage mode, the defect of large exergy loss caused by solid-phase cold storage is overcome, and the cold storage efficiency of the energy storage system is improved.

A combined cycle power generation and storage system is shown. A liquid air energy storage system uses excess power to liquefy air and stores it in a liquid state. A combustion engine produces power by combustion of a carbon-based fuel along with an exhaust stream containing carbon dioxide. A heat recovery system exchanges heat from the exhaust stream to air from the liquid air storage system, and thereby produce a cooled exhaust stream and heated air. An air expansion machine recovers power by expansion of heated air from the heat recovery system. A separation system separates carbon dioxide from ambient air prior to liquefaction during operation of the liquid air energy storage system, and separates carbon dioxide from the cooled exhaust stream during operation of the combustion engine prior to emission of the cooled exhaust stream to atmosphere.

The invention provides a liquid air energy storage novel cold storage system and method based on a fluidization technology, and relates to the technical field of energy storage. The cold storage system comprises a particle storage device, a supply fluidized bed, an air box, a fluidized bed heat exchanger, a separation fluidized bed and an air supply device. The particle storage device is used for storing solid-phase particle media completing the cold release process or solid-phase particle media completing the cold storage process. According to the liquid air energy storage novel cold storage system based on the fluidization technology, due to the fact that the solid-phase particle media are adopted as a cold storage mode, safety is high, operation is easy, and the type and size of the solid-phase particle media can be adjusted according to the requirement for the cold storage amount; the heat exchange fluid does not directly contact with the solid-phase particle medium for heat exchange, so that the application range is wider; the liquid air energy storage novel cold storage system based on the fluidization technology has the advantages of being high in safety, easy to operate, high in cold storage efficiency and wide in application range.

The utility model relates to a liquid air production device which comprises a raw material air compression system, an air cooling and drying system, a circulating pressurization system, an expansion refrigeration system, a heat exchange cold box and a liquid air storage tank. The raw material air compression system comprises a gas feeding air compressor and an air cooler; the air cooling and drying system comprises a freezing dryer and an adsorption dryer; and the circulating supercharging system comprises a circulating supercharger and a supercharging cooler. According to the production method, efficient production of liquid air is achieved through the steps of multi-stage compression, cooling, drying, pressurization, expansion refrigeration and the like. By optimizing energy utilization, low-temperature air cooling capacity is recycled, compression work and power consumption are saved, and the production cost is remarkably reduced. The device is suitable for the fields of energy storage, metal smelting, precision manufacturing and the like.

The invention discloses a mine local ventilation and cooling system and method based on liquid air, and relates to the technical field of mine environment control, and the mine local ventilation and cooling system comprises an intelligent conveying pipeline, an intelligent multi-mode release device, an air purification and energy recovery device and a mine environment self-adaptive monitoring and control system; the intelligent conveying pipeline comprises a multi-layer composite heat insulation structure and an intelligent control module, and the intelligent control module comprises a temperature sensor, a pressure sensor and a flow sensor and is used for monitoring and adjusting the conveying state of liquid air in real time. The intelligent multi-mode release device comprises an intelligent release device with plasma vaporization, ultrasonic nanometer atomization and vortex synergistic functions, through the steps of the intelligent multi-mode release device, efficient conversion and accurate distribution of liquid air from storage to a working face are achieved, the airflow speed and direction are adjusted in real time according to mine environment parameters, and the intelligent multi-mode release device has the advantages of being simple in structure and convenient to use. The uniform distribution and local cooling effect of fresh air are ensured, and the air quality of an operation area is improved.

The invention relates to the technical field of liquid air energy storage, in particular to a high-heat-storage-density liquid air energy storage system and method.The system comprises an air compression unit, an air liquefaction unit, a liquid air gasification unit, a cold storage unit, a heat storage unit and an air expansion power generation unit; the first input end of the air compression unit is used for inputting ambient air, the second input end of the air compression unit is used for inputting electric power, the first output end of the air compression unit is connected with the first input end of the air liquefaction unit, and the second output end of the air compression unit is connected with the first input end of the heat storage unit. The third input end of the air compression unit is connected with the first output end of the heat storage unit. By optimizing the heat storage density and the compression heat utilization and combining the cascade heat utilization and refrigeration technology, the circulation efficiency and the power generation performance of the liquid air energy storage system are improved, and a more efficient solution is provided for practical application of the liquid air energy storage technology.

The invention relates to the technical field of energy storage, and discloses a liquefied air energy storage system which comprises an air compression unit, an air liquefaction storage unit, a liquid air gasification unit and a cold storage unit. According to the liquefied air energy storage system provided by the scheme, air is stored in the form of liquid air, so that the problem of low energy storage density of compressed air can be solved. Moreover, according to the liquefied air energy storage system provided by the scheme, air is stored in the form of normal-pressure liquid air without depending on special geographical conditions and a large number of high-pressure containers and pipelines, and the cost is low.

The invention discloses a liquid air energy storage system based on air separation, which is characterized by comprising an air purification unit, an energy storage unit, an air rectification unit and an LNG (Liquefied Natural Gas) cold supply unit, wherein the air purification unit comprises an air filter, an air compressor, a first cooler, an adsorber and a first heater, and the energy storage unit comprises a first liquid separation tank, a liquid air storage tank, a liquid air pump and an air expansion machine. The air rectification unit comprises a rectification tower, a main cold box, a second liquid separation tank, a second subcooler, a first heat exchanger, a liquid nitrogen storage tank, a liquid oxygen storage tank, a second heat exchanger, an argon rectification system and a liquid argon storage tank; and the LNG cold supply unit comprises a first nitrogen supercharger, a second nitrogen supercharger, an LNG cold box and a first subcooler. The system has the functions of air separation and electric energy storage at the same time, and cold energy of the LNG receiving station is fully utilized for air separation and energy storage to participate in construction of a novel power system of a power grid.

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.

The utility model discloses a drive rake with a gearbox oil air-cooled radiator, which comprises a drive rake and an air-cooled radiator, a portal frame is mounted on a casing of the drive rake through a lower hanger, a support plate is mounted at the rear end of the portal frame, the air-cooled radiator is mounted on the support plate, a gear pump is mounted on the casing of the drive rake, and the gear pump is mounted on the casing of the drive rake. The air cooling radiator, the gear pump and a gearbox of the driving rake are communicated with one another; and the gear pump is matched with a gearbox of the driving rake. By arranging the gear pump and matching the gear pump with the gear box of the driving rake through the gear, the driving of the gear pump can be realized on the premise that other external driving equipment is not needed. Due to the fact that the liquid paths of the gear pump, the gear box and the air cooling radiator are communicated, oil liquid circulation in the gear box can be achieved, and high-temperature oil liquid in the gear box can be actively cooled.

The invention discloses a pressure buildup device and a pressure buildup method for low-temperature purification of helium. The pressure buildup device comprises a flash evaporation unit, a purification unit and a heat regeneration unit which are connected in sequence. According to the invention, through the arrangement of the pressure buildup device, the product gas of the liquid-air separator can be used for carrying out pressure buildup on the adsorber under regeneration pressure buildup in a medium-high pressure working state, so that the adsorber under the regeneration pressure buildup in the working state is prevented from pressurizing the adsorber under the regeneration pressure buildup, and the pressure of the adsorber under the working state is prevented from being lost; due to the fact that the pressure difference between a liquid-air separator and an adsorber under regeneration pressure buildup is large, middle-high pressure impact is prone to causing equipment damage, meanwhile, the pressure buildup process is conducted in the purification process, the time needed by pressure buildup is shortened, after the adsorber in the working state is saturated, pressure buildup of the adsorber in the regeneration state is completed, automatic switching can be achieved, and the efficiency is improved. And the high-purity helium is continuously produced, so that the use requirement of the high-purity helium is met.

The utility model discloses a liquefied air energy storage system which comprises a molecular sieve water separator and a molecular sieve adsorption tower, a separator air output pipe is connected with a top gas connecting pipe of the molecular sieve adsorption tower, and a bottom gas connecting pipe of the molecular sieve adsorption tower is connected with a cold box front compressor unit. The cold box front compressor unit is communicated with an air pipeline in the cold box, and an outlet of the air pipeline in the cold box is communicated with a first liquefied air storage tank through a first liquefied air output pipe with a first throttling valve; the output end of a liquid air pressure pump on a first liquefied air storage tank output pipe of the first liquefied air storage tank is communicated with the air input end of the expansion unit, the air output end of the expansion unit is provided with a hot blowing conveying pipe and a cold blowing conveying pipe, and the hot blowing conveying pipe is communicated with a bottom gas connecting pipe through a first heater and an electric heater; and the output end of the cold blowing gas conveying pipe is connected to the output end of the electric heater output pipe. The device has the advantages of simple structure, low energy consumption and full utilization of heat energy.

The invention relates to the technical field of energy storage, and provides a liquid air energy storage system coupled with an air separation device, which comprises an air compression system, an expansion power generation system, a cold box cold storage system and a liquid air storage tank. The air compression system and the expansion power generation system are both connected with the cold box cold storage system and the liquid air storage tank. The cold box cold storage system is coupled with the air separation device; in the energy storage stage, extra liquid nitrogen produced by the air separation device is used for cooling and liquefying the high-pressure air passing through the cold box, and the liquid nitrogen is gasified and stored in a medium-pressure nitrogen tank; and in the energy release stage, the nitrogen stored in the medium-pressure nitrogen tank reheats the liquid air passing through the cold box, and the nitrogen is cooled and liquefied by the liquid air for use. The cold box cold storage system is coupled with the air separation device to replace an original cold storage unit of the liquid air energy storage system to achieve the energy storage and release process, a cold storage medium does not need to be arranged for the liquid air energy storage system, the purchase cost of the cold storage medium is reduced, and safe operation of the liquid air energy storage system is facilitated.

The invention relates to the technical field of energy storage, and provides a liquid medium-pressure air energy storage system based on LNG (Liquefied Natural Gas) cold energy utilization. The LNG cold storage system is connected with a heat exchange opening of the cold box and used for cooling high-pressure air passing through the cold box into liquid air in the energy storage stage. The energy storage system is further used for rewarming the high-pressure liquid air passing through the cold box to normal temperature in the energy release stage, so that part of cold storage media in the LNG cold storage system absorb the cold energy of the liquid air and store the cold energy; and the LNG cold storage system is further used for gasifying and overheating the LNG passing through the LNG gasifier and the natural gas superheater for 24 hours every day, so that the remaining cold storage medium in the LNG cold storage system absorbs the cold quantity of the LNG and stores the cold quantity of the LNG in the cold storage medium cold fluid storage tank. According to the LNG cold energy recovery system, medium-grade and high-grade cold energy of LNG can be fully recovered, and under the conditions that the same LNG cold energy is supplied and the same efficiency is achieved, the capacity of the system is larger, the structure is simple, and the complexity can be reduced.

The invention belongs to the technical field of LNG (liquefied natural gas) cold energy utilization, and provides an LNG gasification station cold energy utilization system coupled with liquid air energy storage, which comprises a first LNG heat exchange assembly, a second LNG heat exchange assembly and a third LNG heat exchange assembly, the second LNG heat exchange assembly comprises a second heat exchange subsystem, and a cold source and a heat source of the second heat exchange subsystem are LNG and power plant warm discharged water correspondingly; the ORC power generation assembly comprises a sixth heat exchanger and a first turbine generator, a cold source of the sixth heat exchanger is LNG, the LNG is output through an LNG outlet of the sixth heat exchanger, and a driving medium flowing part is arranged between a propane outlet of the sixth heat exchanger and the first turbine generator; and the air energy release assembly comprises a liquid air storage tank, and the output end of the liquid air storage tank communicates with a power generation mechanism. Liquefied air energy storage is conducted through LNG, meanwhile, the ORC cold energy power generation system is coupled, LNG cold energy is efficiently recycled, and self-generation and self-use of electric power are achieved.

The utility model discloses a liquid air energy storage system coupled with air separation and dry ice preparation, which comprises an air compression liquefaction subsystem, a cold energy gradient utilization subsystem, an air expansion power generation subsystem and a heat storage subsystem, the air compression and liquefaction subsystem, the cold energy gradient utilization subsystem and the expansion power generation subsystem are sequentially connected through a compression and liquefaction pipeline and an expansion power generation pipeline, and the heat storage subsystem is connected with the air compression and liquefaction subsystem and the air expansion power generation subsystem through a heat storage circulation pipeline. The cold energy gradient utilization subsystem is arranged to replace an existing low-temperature cold storage unit, the liquid air energy storage system is coupled with the air separation unit and the dry ice preparation unit, liquid air cold energy gradient utilization is achieved, and meanwhile energy consumption and construction cost of the air separation system are reduced. The power generation stability of the liquid air energy storage system is guaranteed, and the comprehensive efficiency and the environmental protection property of the liquid air energy storage system are improved.

The invention relates to the technical field of liquid air energy storage, in particular to a liquid air energy storage device and method based on backflow cold storage circulation. The air liquefaction circulation loop comprises an air compressor unit, an air purification unit, a cold box, a liquid air storage tank, a cold storage unit and a heat storage unit. In the electricity utilization trough period, after being purified, compressed and cooled, ambient air is expanded and depressurized to obtain liquid air, meanwhile, air compression heat energy is recycled and stored, and cold energy of the cold storage unit is reused through circulation air flowing out of the air purification unit to strengthen the liquefaction performance; in the peak period of power utilization, liquid air enters the power generation expansion unit for power generation after being pressurized, evaporated and heated, and evaporation cold energy is recycled and stored through outlet gas of the power generation expansion unit. The cold energy recovery and storage efficiency of the solid cold storage packed bed is improved through the structural form of backflow cold storage circulation, and air compression heat energy is effectively distributed and utilized.

The present invention relates to a hard surface cleaning device. The hard surface cleaning device includes: a suction assembly configured to form a suction flow, the suction assembly including a suction blade and an electric motor for driving the suction blade; a suction nozzle in fluid communication with the suction assembly and configured to suck a liquid-air mixture from a hard surface; a flow path between the suction nozzle and the suction assembly; and a liquid storage tank configured to contain separated liquid. The flow path passes through the liquid storage tank and includes a separating component configured to separate liquid from the liquid-air mixture, the separating component extending into the liquid storage tank. The flow path further includes a receiving chamber between the suction nozzle and the separating component, the receiving chamber being independent of a shell of the hard surface cleaning device.

A coupling system for liquefied natural gas re-gasification and liquid air energy storage. The coupling system comprises a liquefied natural gas re-gasification system and a liquid air energy storage system. The liquefied natural gas re-gasification system comprises: a heat exchanger-natural gas (HX-NG) connected to a liquefied natural gas re-gasification path. The liquid air energy storage system comprises: a heat exchanger-charge (HX-C) connected to a main gas liquefaction path, a heat exchanger-discharge (HX-DC) connected to a liquefied main gas re-gasification path, and a cold dewar (CD), wherein a first heat exchange cycle where cold energy exchange is performed with a first heat exchange medium is formed between the heat exchanger-natural gas and the heat exchanger-charge; and a second heat exchange cycle where cold energy exchange is performed with a second heat exchange medium is formed among the heat exchanger-charge, the cold dewar and the heat exchanger-discharge. In the first heat exchange cycle, a hot end of the heat exchanger-natural gas is connected to a hot end of the heat exchanger-charge, and a cold end of the heat exchanger-natural gas is connected to a cold end of the heat exchanger-charge; and in the second heat exchange cycle, hot ends of the heat exchanger-charge, the cold dewar and the heat exchanger-discharge are connected, and cold ends of the heat exchanger-charge, the cold dewar and the heat exchanger-discharge are connected. In the present invention, regardless of whether the liquid air energy storage system is in a charging working state, a standing working state or a discharging working state, effective coupling utilization of cold energy and heat energy between the liquid air energy storage system and the liquefied natural gas re-gasification system can be realized, improving the effective coupling utilization rate of cold energy and heat energy between the systems.

The invention relates to the technical field of energy storage and comprehensive utilization, in particular to an equipment reuse type liquid air energy storage system and method for combined cooling and power, the system comprises a compression unit, a cold storage unit, an organic Rankine cycle unit, a heat storage unit and an expansion unit, and the system operation is divided into an energy storage stage and an energy release stage. In the energy storage stage, after the environment air is subjected to multi-stage compression, LNG high-grade cold energy is used for assisting liquefaction and storage, medium-grade cold energy drives ORC cycle power generation, and low-grade cold energy precools and compresses inlet air according to needs; and in the energy release stage, liquid air is gasified to drive ORC cycle and an expansion machine to generate power, the cold energy is recycled by the cold storage unit, and the reversible heat exchanger group realizes reuse of interstage cooling and heating functions. Through LNG cold energy gradient utilization, equipment function integration and multi-system cooperation, the problems of equipment redundancy, low efficiency and high cost of an existing system are solved, the comprehensive energy utilization rate and the system stability are improved, and electricity-cold-gas multi-energy combined supply is achieved.

The invention provides a constant-pressure energy storage system and a constant-pressure expansion power generation method. Comprising a first-stage compressor motor, a first-stage compressor, a second-stage compressor motor, a second-stage compressor, a high-pressure cylinder, a low-pressure cylinder, a generator, an exhaust funnel, a hot water storage tank, a cold water storage tank, a compressed air condenser, a ground pipeline steel gas storage, a hot water storage pump, a cold water storage pump, a liquid air booster pump, an air inlet cooler, a first-stage cold water storage heater and a first-stage air cooler. The system comprises a first-stage gas-water separator, a second-stage cold water storage heater, a second-stage air cooler, a second-stage gas-water separator, a second-stage hot water storage cooler, a first-stage hot water storage cooler, a seawater preheater, a seawater heater, a compressor outlet shut-off valve, a pressure stabilization regulating valve and a liquid air supply valve. The air storage device is miniaturized, cold energy is efficiently utilized, and the system efficiency is improved.

The invention belongs to the technical field of liquid air energy storage systems and LNG cold energy utilization, and discloses a liquid air energy storage and LNG cold energy complementary system which comprises a compressor unit subsystem, a heat storage subsystem, a liquid gasification subsystem, a liquid air storage tank subsystem, a cold storage subsystem and an expansion power generation subsystem. The compressor unit subsystem comprises an air filter, a normal-temperature compressor, a heat exchanger, a molecular sieve purifier, a low-temperature heat exchanger, a low-temperature compressor and a pipeline valve and is used for compressing air. The invention provides a liquid air energy storage system and method coupled with LNG cold energy complementary utilization. High-grade cold energy complementary utilization between the liquid air energy storage system and LNG is achieved. The LNG cold energy is utilized to the maximum extent, meanwhile, high-grade cold energy generated in the energy release stage can be reversely provided for BOG of the LNG receiving station, liquefaction of the BOG is achieved, waste of the BOG of the LNG receiving station and energy consumption of a BOG compressor are reduced, and complementary utilization of the cold energy is achieved.