313 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 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 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 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.

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 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 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.

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.

The invention relates to the technical field of concrete materials, in particular to a formula of plateau high-cold high-speed railway bridge pier column anti-crack concrete which comprises the following components: 280-320 kg / m < 3 > of Portland cement, 80-100 kg / m < 3 > of mineral powder, 60-80 kg / m < 3 > of coal ash, 800-850 kg / m < 3 > of machine-made sand with the fineness of 2.6-3.0, 900-1000 kg / m < 3 > of broken stone, 140-160 kg / m < 3 > of water and 4.0-5.0 kg / m < 3 > of polycarboxylic acid water reducing agent. The total use amount of the retarding components in the water reducing agent is 0.8-1.2 kg / m < 3 >, the air entraining agent comprises triterpenoid saponin and a liquid air entraining agent, the total use amount is 0.02-0.05 kg / m < 3 >, and the use amount of the polypropylene fiber is 0.9-1.2 kg / m < 3 >. Through a low water-binder ratio, a composite gelling system, fiber reinforcement and seasonal regulation and control composite admixture technology, the compressive strength, crack resistance and freeze-thaw resistance are remarkably improved, and the composite admixture is suitable for bridge engineering in plateau alpine regions.

The invention relates to the technical field of liquid air energy storage and cold energy storage, in particular to a liquid air energy storage power generation device and method based on packed bed cascade cold accumulation, and the liquid air energy storage power generation device comprises a liquid air supply unit, a cold energy cascade storage and exchange unit and an air expansion power generation unit. Liquid air is pressurized by a low-temperature pump and then enters the cold energy cascade storage and exchange unit, graded vaporization is carried out to release cold energy, the vaporized air enters the air expansion power generation unit to carry out expansion power generation, the air with residual pressure after power generation is completed serves as heat exchange fluid to enter the cold energy cascade storage and exchange unit, and low-temperature cold energy is recovered in a graded mode and stored in a cascade mode. Through graded heat exchange and cascade cold storage, the heat exchange temperature difference is reduced, the temperature gradient of the packed bed is reduced, then the cold loss in the heat exchange and cold storage process is reduced, and the system efficiency is improved. In addition, the residual pressure generated after air power generation is used as driving, an additional circulating fan is not needed, and the investment cost can be reduced.

The invention discloses a liquid air energy storage and low-temperature air separation combined system and method, which comprises an air compression subsystem, an air purification subsystem, a heat storage subsystem, a liquid gasification subsystem, a cold storage subsystem, an energy release power generation subsystem, a low-temperature air molecular system and a central cooperative control module, the air compression subsystem is composed of multiple sections of compressor units, an interstage cooler and related pipeline valves, and the interstage cooler is connected with the heat storage subsystem. According to the low-temperature air separation system, high-energy-consumption compression expansion equipment does not need to be independently built in a matched mode, the investment cost of the system is greatly reduced, and the low-temperature air separation system can achieve air separation production only through air raw materials continuously provided by the liquid air energy storage system and cold energy supply; compression power consumption in a traditional low-temperature air separation system is greatly reduced, and meanwhile waste of compression heat energy is reduced.

The invention discloses an air liquefaction and energy comprehensive utilization system, which relates to the technical field of air liquefaction and utilization, and comprises an air compression unit, an air liquefaction unit, a liquid air energy storage unit, an energy release power generation unit, a heat storage unit, a cold storage unit and an optimization control unit, the air compression unit sucks and compresses ambient air, and then cools the air. Through close cooperation and efficient operation of all the units, the system achieves efficient compression, liquefaction, storage and energy release of air, the utilization efficiency of energy is greatly improved, the storage and energy release process of liquid air provides flexible energy dispatching capacity for the system, stable power output can be provided at the demand peak, and meanwhile, the system has the advantages that the energy utilization efficiency is improved. Due to the arrangement of the heat storage unit and the cold storage unit, the energy comprehensive utilization efficiency of the system is further improved, waste heat in the compression process and the cooling capacity in the liquefied air gasification process are recycled and reused, energy waste is reduced, and the operation cost of the system is reduced.

The invention provides a low-temperature liquid energy storage and air separation coupling system and method utilizing LNG cold energy, and relates to the technical field of electric energy storage systems. The low-temperature liquid energy storage and air separation coupling system utilizing the LNG cold energy comprises an air compression purification and pressurization unit, an air liquefaction and air separation cold box, a liquid air storage and pressurization unit, an air expansion power generation unit and an LNG cold box. The low-temperature liquid energy storage and air separation coupling method utilizing the LNG cold energy comprises the following steps that during energy storage, raw material air is cooled and purified, then the LNG cold energy is absorbed for air separation rectification and liquid air storage, and the liquid air part is conveyed to air separation rectification to ensure that the product yield is stable; and during energy release, the stored liquid air is conveyed to the expansion generator set for expansion power generation. The problem that LNG cold energy supply and air separation requirements are not synchronous is solved, efficient and stable operation of a cold energy air separation device is guaranteed, the LNG cold energy utilization rate is increased, and the energy conversion efficiency of an LAES system is improved.

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.

A virtual power plant low-carbon economic dispatching method considering cooperation of hydrogen energy storage and liquid air energy storage comprises the steps that firstly, a hydrogen energy storage model is established, hydrogen energy serves as extension of the electricity-to-gas technology, and part of natural gas is replaced with the electricity-to-hydrogen and hydrogen gas turbine technology; secondly, establishing a liquid air energy storage (LAES) model, and stabilizing the output fluctuation of the unit by using the high-capacity and long-period electricity storage and discharge capability of the LAES model; and finally, hydrogen energy storage and liquid air energy storage are brought into an overall optimization scheduling framework, an electricity-gas-heat-hydrogen multi-energy complementary virtual power plant (VPP) model is constructed, and an improved mixed grey wolf optimization algorithm is used for solving. According to the invention, various energy conversion and energy storage devices are coupled, and wind power and photovoltaic power can be flexibly scheduled in a cross-time manner and fully utilized through joint optimization scheduling, so that collaborative optimal configuration of internal multi-energy resources is realized, the operation cost of the system is reduced, and carbon emission is reduced.

The invention provides a variable-load liquid air compression energy storage system which is characterized in that target to-be-liquefied air is subjected to shunting treatment through a main cold box with a shunting function, then the shunted air is subjected to secondary pressurization and then is subjected to throttling cooling, that is, the refrigeration mode that the shunted air is subjected to secondary pressurization and then is subjected to throttling is adopted; the cold source needed by air liquefaction is supplemented, when the energy storage duration of the system is increased, a certain cooling capacity can be provided as long as shunting air exists, the running duration range of the system is widened, and the load range of the system is widened; in addition, by changing the proportion of the split air to the main air, the supplied cooling capacity can be increased, and the overall liquefaction rate of the system air can be guaranteed.

The present invention relates to a cold-electricity integrated utilization system based on energy coupling, comprising: an LNG receiving station, wherein LNG is gasified into natural gas after being utilized for cold energy by a cold energy power generation and refrigeration system, a liquid air energy storage system, a cold energy air separation system, and a light hydrocarbon separation system. The natural gas then enters the natural gas pipeline network, the gas-fired power generation system, and the natural gas hydrogen production system; the cold energy power generation and refrigeration system utilizes cold energy to generate electricity for self-use within the plant area, with excess electricity transmitted to the power grid, while also producing refrigerated products; the liquid air energy storage system utilizes cold energy to generate electricity for self-use within the plant area, with excess electricity transmitted to the power grid; the cold energy air separation system utilizes cold energy to produce liquid oxygen, liquid nitrogen, and liquid helium; the light hydrocarbon separation system utilizes cold energy to produce ethane and LPG products; the gas-fired power generation system utilizes natural gas to generate electricity and transmits it directly to the power grid; and the natural gas hydrogen production system utilizes natural gas to produce hydrogen. The present invention can be widely applied to the field of LNG cold energy utilization technology.

The invention provides a liquefied air energy storage system coupled with LNG cold energy Rankine cycle power generation, and particularly relates to the technical field of liquefied air energy storage. During charging, an LNG cold source enters the first heat exchange side of the first LNG heat exchanger, the first heat exchange side of the third LNG heat exchanger and the second LNG heat exchanger, the first heat exchange side of the second LNG heat exchanger exchanges heat with air and cools the air, during discharging, the LNG cold source enters the first heat exchange side of the cold energy power generation condenser, and the second heat exchange side of the second LNG heat exchanger exchanges heat with the air and cools the air. Liquefied air in the cold energy power generation condenser and LNG jointly provide cold energy and generate power, the LNG cold source enters different heat exchangers for heat exchange during discharging and charging, the LNG cold source and the heat exchangers operate independently and do not interfere with each other, the utilization rate of LNG cold energy can be increased, and the efficiency of the liquid air energy storage system is further improved.

A gas engine system (1) according to one embodiment of the present invention comprises: a reciprocating engine for supplying air through an air supply path using gas obtained by gasifying liquefied gas as a fuel; a liquid air generator (5) that generates liquid air by means of cooling when the liquefied gas is gasified; and a nitrogen gas supply path (71) for supplying nitrogen gas obtained by vaporizing liquid nitrogen in the liquid air to the gas supply path. For example, the liquefied gas is liquefied hydrogen.

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.