168 results about "Liquid air" patented technology

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 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 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 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.

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 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.

The invention discloses a multifunctional air separation device for preparing liquid oxygen by liquefying air and nitrogen through a liquid oxygen self-pressurization evaporator and pouring liquid nitrogen backwards. Comprising an air filtering and compressing system, a pre-cooling system, an air purifying unit, a main heat exchanger, a liquid oxygen evaporator, a low-pressure expansion machine, a rectifying tower, a liquid air and liquid nitrogen subcooler, a high-purity oxygen tower, an argon extracting system, a medium-pressure nitrogen pipe network, a liquid oxygen pipe network, a nitrogen liquefier, a heat exchanger I and a gas-liquid separator, the output of the liquid oxygen evaporator is provided with a pressure oxygen pipeline, the pressure oxygen pipeline exchanges heat through the main heat exchanger and then is output and stored, the output of the bottom of the liquid oxygen evaporator is provided with a product liquid oxygen pipeline, the medium-pressure nitrogen pipe network is output to the nitrogen liquefier through the heat exchanger I, the input of the liquid oxygen pipe network is connected with the nitrogen liquefier, and the nitrogen liquefier is connected with the gas-liquid separator. The hydrogen-free argon production process and the oxygen external compression mode are adopted, the liquid oxygen self-pressurization function is achieved, air and nitrogen are liquefied, and the multifunctional characteristic is achieved.

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 application provides a liquid hydrogen storage and supply system with a valve box, and belongs to the technical field of liquid hydrogen fuel cells.The liquid hydrogen storage and supply system comprises a liquid hydrogen bottle, an internal storage space of the liquid hydrogen bottle being used for storing liquid hydrogen, a valve box, an internal placement space of the valve box being used for placing a delivery pipeline and a valve, the placement space being a vacuum environment, and the storage space and the placement space being communicated through a connecting heat pipe.The liquid hydrogen storage and supply system with the valve box sets the placement space of the valve box as a vacuum environment, so that the internal delivery pipeline and the valve can be simplified as a single-wall structure, the complex layout of a plurality of vacuum pipes and vacuum stop valves is replaced, and the liquid hydrogen delivery process on an automobile is more suitable;the liquid hydrogen storage and supply system meets the requirements of a small space of a whole vehicle, and solves the problems of frost formation of liquid air and a pipe wall caused by the liquid hydrogen pipeline and easy jamming of a low-temperature valve in a deep cooling environment.

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.

The utility model discloses a liquid air energy storage system coupled with ORC and ARS, and belongs to the technical field of energy storage and utilization. Comprising an air liquefaction circulation loop unit, an air power generation circulation loop unit, an ORC unit and an ARS unit. According to the system, organic Rankine cycle (ORC) and absorption refrigeration (ARS) are firstly coupled to realize waste heat utilization, and on the basis, a circulation process is added to utilize energy stored by purge high-temperature air behind a gas-liquid separator to realize further energy utilization. Compared with a traditional liquefied air energy storage system, loss in the heat transfer process can be effectively reduced, loss caused by mixing of cold / heat energy of different energy levels is avoided, and the purposes of cold / heat energy graded storage, efficient air compression heat utilization and system efficiency improvement are achieved.

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.

The invention belongs to the technical field of deep cooling air separation devices, particularly relates to a deep cooling air separation device and method for special gas separation and purification, and provides the following scheme aiming at the problem of local temperature imbalance caused by uneven heating of the bottom of a rectifying tower: the deep cooling air separation device comprises the rectifying tower, and the bottom of the rectifying tower is fixedly connected with a heating seat; a plurality of layering plates are arranged in the rectifying tower, a temperature expanding assembly is arranged in the rectifying tower, the temperature expanding assembly is located below the layering plate at the bottom, the temperature expanding assembly comprises a driving motor, a power output shaft of the driving motor is connected with a driving rod through a coupler, and a fixing plate is arranged on the outer side of the driving rod. The deep cooling air separation device and method for separating and purifying the special gas have the beneficial effects that steam and liquid air in the tower can be fully stirred, the situation of local overheating or insufficient temperature is avoided, the temperature distribution of the bottom area of the rectifying tower is more uniform, and it is guaranteed that all components are accurately separated according to boiling points.

The application discloses a thermal power unit coordinated peak shaving system and method based on liquid air energy storage. The system is coupled and composed of an air compression and liquefaction circulating unit, an air expansion and power generation circulating unit, a molten salt heat storage circulating unit and a thermal power water-steam circulating unit. During the low valley period of the power grid, the system enters the energy storage process, the thermal power unit operates at the lowest stable operating condition as the load reduction reference, and part of the output power of the thermal power unit is used for preparing liquid air; meanwhile, part of the reheated steam is extracted, and the heat thereof is stored in the high-temperature molten salt tank in the form of high-temperature molten salt. During the peak period of the power grid, the system enters the energy release process, the thermal power unit operates at the highest stable operating condition as the load increase reference, the liquid air is heated by the high-temperature molten salt, expands and does work to generate power, so that the power generation capacity of the liquid air energy storage system and the on-grid power of the coupled system are improved. The system has the advantages of large peak shaving depth, strong power generation capacity during the peak period, high energy utilization efficiency and flexible operation mode.

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 relates to a liquid air energy storage system and method coupled with photo-thermal and ultra-high temperature heat pump, the system comprises a liquid air energy storage subsystem, a heat pump subsystem and a photo-thermal energy storage subsystem, the photo-thermal energy storage subsystem comprises a fused salt storage and conveying device, a fused salt steam heat exchange device, a steam turbine generator unit, a steam condensation device and a pump, a steam generating part is arranged in the fused salt steam heat exchange device, and the steam generating part is communicated with the steam turbine generator unit, the steam condensing device and the pump through a power generation circulating pipe to form a closed power generation circulating pipeline; the fused salt storage and conveying device and the fused salt steam heat exchange device are communicated through a fused salt circulating pipe to form a closed fused salt circulating pipeline; the liquid air energy storage subsystem and the photo-thermal energy storage subsystem share the fused salt storage and conveying device.

The invention provides a cold storage and heat storage coupled thermal energy storage system and a control method thereof, and relates to the technical field of thermal energy storage. The heat energy storage system comprises an energy storage subsystem and an energy release subsystem. The energy storage subsystem can convert electric energy into heat energy of heat conduction oil and fused salt and cold energy of liquid air, and supply of natural gas and liquefaction of carbon dioxide are completed while conversion is conducted. The energy release subsystem converts stored heat energy of heat conduction oil and fused salt and cold energy of liquid air into electric energy, and meanwhile supply of natural gas and liquefaction of carbon dioxide are completed. Through energy conversion between electric energy and air, fused salt, heat conduction oil and carbon dioxide, the cold storage and heat storage coupled heat energy storage system is achieved, the problem that renewable energy power generation and consumption are difficult can be solved to a certain extent, and power grid supply and demand are balanced.

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 utility model discloses a novel nitrogen making device which comprises an air compressor, a pre-cooling unit, a purification system and a fractionating tower which are communicated in sequence, raw material air is compressed by the air compressor, cooled by the precooling unit and then enters the purification system; entering a fractionating tower; in a main heat exchanger of the fractionating tower, air exchanges heat with the refluxed oxygen-enriched gas and nitrogen, the temperature is reduced to be close to an air liquefaction point, the air enters a rectifying tower for rectification, and high-purity nitrogen is obtained at the top of the rectifying tower; one part of the high-purity nitrogen serves as product nitrogen, is reheated by the main heat exchanger, is discharged from the fractionating tower and is sent to a user; one part of the obtained liquid nitrogen is output as a product, and the other part of the obtained liquid nitrogen enters the rectifying tower again to serve as reflux liquid; one part of liquid air is throttled, enters the subcooler, is vaporized and then is converged with the expanded oxygen-enriched gas; the rectified liquid nitrogen enters a main heat exchanger through a liquid nitrogen pump to be reheated and serves as another stream of product nitrogen; the device can be used for producing nitrogen with two different pressures.