885 results about "Liquefaction" patented technology

The invention discloses an ocean temperature difference coupled offshore constant-pressure compressed carbon dioxide energy storage system and method, and relates to the technical field of compressed gas energy storage. The system comprises a working medium constant-pressure storage device, a carbon dioxide energy storage circulation loop, a carbon dioxide energy release circulation loop and a heat storage circulation loop. Gaseous carbon dioxide is condensed into a liquid state by utilizing deep sea low-temperature seawater in an energy storage stage, liquid carbon dioxide is evaporated into a gaseous state by utilizing shallow sea high-temperature seawater in an energy release stage, and gas-liquid conversion of carbon dioxide is realized by fully utilizing ocean new energy and ocean temperature difference; the flexible working medium constant-pressure storage device is used for storing low-pressure gaseous carbon dioxide and high-pressure liquid carbon dioxide, the constant pressure of the working medium constant-pressure storage device in the charging and discharging process can be guaranteed, and efficient and stable operation of the system is achieved. Efficient liquefaction and high-density storage of high-pressure carbon dioxide are achieved through the ocean temperature difference and seawater static pressure, the efficiency and energy density of the energy storage system are improved, and deep development of offshore resources is achieved.

The invention provides a method and system for estimating the vertical bearing capacity of a steel pipe pile, and relates to the technical field of pile foundation engineering.The method comprises the steps that a static cone penetration test is conducted on a seabed stratum needing to be arranged for a steel pipe pile foundation, experimental data are obtained and subjected to normalization processing, soil behavior types are divided, and soil layer mechanical parameters are inverted; calculating side friction resistance and end resistance of the steel pipe pile based on the soil layer mechanical parameters to obtain initial static ultimate bearing capacity; historical equivalent cyclic load experimental data of waves in the construction sea area are obtained, an equivalent cyclic load reduction coefficient, a liquefaction reduction coefficient and a time-varying corrosion reduction coefficient are constructed, and a comprehensive time-varying reduction coefficient is constructed; the initial static ultimate bearing capacity is corrected based on the comprehensive time-varying reduction coefficient, the vertical bearing capacity of the steel pipe pile in the long-term service period is predicted, and the time-varying ultimate bearing capacity is obtained; setting an evaluation threshold according to the time-varying ultimate bearing capacity, dynamically adjusting a bearing capacity grading threshold interval, and outputting a bearing capacity grading evaluation result.

The invention relates to the technical field of compressed carbon dioxide energy storage, and discloses a liquid compressed carbon dioxide energy storage system and method. The system comprises a carbon dioxide circulation system, and the circulation system comprises a first liquid storage tank (1), a first evaporation unit (100), an energy storage unit (200), a second liquid storage tank (6), a second evaporation unit (300), an energy release unit (400) and a condensation unit (500) which are communicated in sequence. According to the system provided by the invention, a liquid compressed carbon dioxide circulating system is deeply coupled with waste heat and waste cold in an ethylene process, so that the problems of a gasification heat source of liquid carbon dioxide on a high-pressure side and a liquefaction cold source of gaseous carbon dioxide on a low-pressure side of a pressure storage system are solved; the bottleneck constraint of heat energy utilization of the conventional adiabatic compression carbon dioxide energy storage system is broken through; elastic distribution of compression heat between industrial steam production and carbon dioxide overheating can be achieved.

The utility model relates to the technical field of heat pump rectification, and particularly discloses a heat pump rectification system which comprises a rectification tower; the tower top gas liquefaction system comprises a compressor connected with a gas phase at the top of the rectifying tower, and a reboiler, a throttling device, a condenser and a flow divider which are sequentially connected with the compressor; liquid phase connection at the bottom of the rectifying tower is communicated with the reboiler, the tower bottom reboiling system comprises an auxiliary reboiler and a flash evaporator which are sequentially communicated with the reboiler, and the flash evaporator is communicated to the rectifying tower; and the gas phase at the top of the rectifying tower is heated by the compressor and then enters the reboiler to exchange heat with the liquid phase at the bottom of the rectifying tower, so that the rectifying energy consumption can be reduced, and the energy-saving effect is achieved.

The utility model provides a carbon dioxide liquefaction system, a liquid cargo system and a carbon dioxide capture system, and belongs to the technical field of carbon capture. Wherein the liquefying system comprises a compression device, a liquefying device and a storage tank device, the storage tank device receives liquid carbon dioxide output by the liquefying device through a second liquid inlet end and outputs gaseous carbon dioxide in the storage tank device into the compression device, and the compression device recompresses the gaseous carbon dioxide output by the storage tank device and outputs the compressed gaseous carbon dioxide into the storage tank device. Then liquefying by the liquefying device, and inputting into the storage tank device for storage; the gaseous carbon dioxide in the storage tank device is compressed and liquefied into the liquid carbon dioxide again, and the problems that in the liquid carbon dioxide storage process of the storage tank, part of the liquid carbon dioxide in the storage tank is gasified into the gaseous carbon dioxide, loss of the liquid carbon dioxide is caused, and then the liquefaction efficiency of the carbon dioxide is reduced are solved; the loss of liquid carbon dioxide is avoided.

The present disclosure relates to a carbon dioxide capture apparatus and process combined with biogas upgrading, and there is provided the carbon dioxide capture apparatus combined with biogas upgrading for simultaneously obtaining high purity methane and carbon dioxide, and improving separation efficiency without an additional process by making use of gas streams after a liquefaction process, and recovering cold heat in the process.

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 provides a flash steam pressurization gas supply and reliquefaction circulation combined system and a liquid cargo ship. The combined system comprises a first heat exchanger, a second heat exchanger, a multi-stage compression device, a reliquefaction pipeline and a gas-liquid separation module, and flash steam is input into the first side of the first heat exchanger. The main inlet of the compression device is connected with the first side of the first heat exchanger. And a liquid return opening is formed in the pipeline before the last-stage compression in the compression device. And an outlet of the reliquefaction pipeline is connected with a second side inlet of the first heat exchanger and a first side inlet of the second heat exchanger through parallel connection of first and second pipelines. The second side of the first heat exchanger and the first side outlet of the second heat exchanger are connected with the liquid inlet of the gas-liquid separation module, the liquid outlet is connected with the liquid cargo tank, and at least part of gas discharged from the gas outlet is sent to the pipeline before the first-stage compression and after the first-stage compression of the liquid return port through the second side of the second heat exchanger. High-pressure gas supply and flash steam medium-pressure reliquefaction are achieved, energy consumption is reduced, and the reliquefaction capacity is improved.

The invention discloses an oil gas treatment method and system based on pressure triggering and temperature feedback control, a medium and a product, and relates to the field of oil gas treatment. The method comprises the following steps: when a pressure value and an actual temperature of an oil tank meet trigger conditions, guiding oil gas in the oil tank into a condensation unit for condensation, liquefying preset high-boiling-point components in the oil gas into a liquid oil product, and adsorbing the condensed residual oil gas through a double-layer adsorption bed arranged in an adsorption tank in sequence; according to the temperature of the adsorption bed and the tail gas emission concentration, the saturation index is calculated through a composite saturation judgment algorithm, when adsorption is saturated, the vacuum pump is started to conduct vacuum desorption on the adsorption tank, oil gas adsorbed on the double-layer adsorption bed is desorbed, and the desorbed oil gas is circularly sent back to an inlet of the condensation unit to be subjected to secondary condensation liquefaction recovery. By implementing the technical scheme, oil gas can be effectively treated, and the oil gas recovery efficiency is improved.

The invention provides an oil shale supercritical CO2 fracturing and in-situ conversion integrated device and a working method, belongs to the technical field of oil shale exploitation, and realizes efficient cooperation of supercritical CO2 fracturing and in-situ conversion by integrating a CO2 liquefaction storage system, a fracturing heating system, a stratum simulation system and a data monitoring system. The device comprises a CO2 liquefying and storing system, a CO2 liquefying and storing system, a CO2 liquid storage system, a CO2 liquid storage system and a CO2 liquid storage system, the oil shale fracturing and heating system is used for fracturing the rock core under the simulated formation confining pressure condition and triggering the oil shale in-situ cracking reaction through medium-frequency heating; the oil shale fracturing model is used for simulating an underground fracturing environment and guiding crack propagation; the data monitoring system collects temperature and pressure parameters in real time to optimize process regulation and control. The fracturing process and the conversion process are innovatively coupled, the supercritical CO2 has the characteristics of a fracturing medium, a heat transfer carrier and a reaction medium, the energy utilization rate and the CO2 circulation efficiency are remarkably improved, and the oil shale recovery rate is increased.

Provided are a micro-scale apparatus and method for liquefying natural gas The apparatus comprises a first heat exchanger that cools a natural gas feed stream by heat exchange with a first cooling fluid from a chiller, a compressor configured to compress the cooled natural gas, an air cooler configured to further cool the compressed natural gas, a second heat exchanger configured to further cool the natural gas by heat exchange with a second cooling fluid, a third heat exchanger configured to further cool the cooled natural gas, a joule-thompson (JT) valve configured to cool the flow of cooled natural gas to create LNG, a separator configured to separate a liquified LNG from a vapour phase, and a return flow path connected to the natural gas inlet, wherein the return flow path is optionally configured to pass as cooling medium via the third heat exchanger, wherein optionally the return flow path is configured to transport the vapour phase from the separator via the third heat exchanger for heating by heat exchange a gas flow entering the inlet of the third heat exchanger, and to combine the heated vapour phase with the natural gas feed stream.

According to the carbon dioxide energy storage coupling carbon capture system, during energy storage, carbon dioxide discharged by the carbon capture system passes through a multi-stage compression cooling assembly in an energy storage pipeline, so that the carbon dioxide is in a high-pressure supercritical state and enters a high-pressure carbon dioxide storage tank to be stored. During energy release, the carbon dioxide is heated and expanded when passing through the multi-stage expansion heating assembly in the energy release pipeline. Expansion acting can be used for power generation. And the expanded carbon dioxide enters the LNG heat exchange system to be liquefied, and the carbon dioxide enters the liquid carbon dioxide storage tank after being cooled and liquefied. The heat conduction pipeline is used for conducting heat exchange in the energy storage and release process. According to the carbon dioxide energy storage coupling carbon capture system, redundant electric quantity can be stored in the energy storage process, energy release and power generation can be carried out in the power utilization peak period, and carbon dioxide can be liquefied through the cold capacity of LNG gas.

The utility model belongs to the technical field of liquid hydrogen stations, and particularly relates to a liquid hydrogen station BOG recycling system which comprises a liquid hydrogen tank car, a liquid hydrogen storage tank, a hydrogen liquefying device and a hydrogen recycling device. A gas outlet of the liquid hydrogen storage tank is respectively connected with the hydrogen liquefaction device and the hydrogen recovery device through a BOG gas phase recovery pipeline, and a liquid outlet of the hydrogen liquefaction device is connected with a liquid inlet of the liquid hydrogen storage tank. According to the system and the control scheme, BOG generated in the operation process of the liquid hydrogen filling station is reasonably recovered, complete recovery and efficient storage of BOG hydrogen are achieved, the system and the control scheme are high in automation degree and good in applicability, the on-site operation time of operation personnel is shortened, and the production efficiency is improved. And the overpressure emission or direct emission of hazardous gases such as BOG (boil-off gas) in the transportation process of the liquid hydrogen tank car is reduced.

The invention belongs to the field of oil and gas exploitation, geothermal exploitation and deep ground engineering, and discloses an oil and gas shaft crack plugging pressure repair material and method based on microwave heating bismuth-based alloy, the material comprises 74%-86% of bismuth-based alloy powder, 10%-15% of Fe3O4-SiO2 core-shell magnetic particles, 3%-8% of a microwave sensitizer and 1%-3% of a wetting agent. The repairing material is conveyed to the position, where shaft crack plugging repairing needs to be conducted, in the oil and gas shaft, then the repairing material is melted in a microwave heating mode, then the melted alloy is filled in shaft crack plugging, and then a rotating gradient magnetic field is used for repairing the oil and gas shaft crack. And the liquid alloy is driven to directionally migrate to a target crack area along the magnetic line, and after alloy liquid is cooled and solidified, pressure repairing of the oil and gas shaft crack plugging target position is achieved. Precise positioning, efficient filling, phase change control and complete recovery of the repairing material can be achieved in the extremely deep environment, and therefore the high-quality repairing requirement for oil and gas shaft crack plugging pressure repairing achieved through efficient liquefaction of plugging metal can be met.

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.

Gas turbine power plant flue gas carbon dioxide capture system and method, which relates to the field of purification and treatment of flue gas pollutants. It solves the problems that in the existing carbon dioxide capture of gas turbine power plants, the physical separation method has high energy consumption and is not suitable for large-scale capture, and the chemical absorption method has environmental pollution and great capture difficulty. In the present invention, after the flue gas is cooled twice before and after passing through a cold water heat exchanger and a refrigerant heat exchanger in sequence, the low-concentration carbon dioxide flue gas is adsorbed and enriched by a carbon dioxide molecular sieve group, and the carbon dioxide mixed gas and the high-pressure impurity mixed gas are separated, and the carbon dioxide mixed gas is compressed and cooled by a compressor and a refrigerant heat exchanger, so as to realize the liquefaction and separation of low-concentration carbon dioxide. The present invention mainly purifies and treats flue gas pollutants.

A system and method for high rate liquid hydrogen tank filling is provided. The flexible, pump-based filling system can achieve high fill rate of liquid hydrogen in excess of 100 kg per minute and accommodate maximum delivery pressures. The present system and method further includes recovery and re-liquefaction of displaced and flash generated tank vapors.

The utility model discloses a recovery system for capturing carbon dioxide. The recovery system comprises a carbon capturing unit, a cooling unit, a drying unit, a liquefying unit and a storage unit which are sequentially connected through pipelines, after the carbon capture unit captures carbon dioxide, the carbon dioxide is cooled by the cooling unit and dried by the drying unit, then enters the liquefaction unit to be compressed and liquefied to form liquid carbon dioxide, and then the liquid carbon dioxide is conveyed to the storage unit to be stored. According to the utility model, CO2 after carbon capture can be stored after being cooled, pressurized and liquefied. The system integrates unloading and reliquefaction functions, liquid CO2 in the storage tank can be lighted to a CO2 receiver, and gaseous CO2 in the storage tank is returned to the storage tank for storage after being cooled, pressurized and liquefied. And the system is provided with a plurality of instruments and meters, so that the whole system is more automatic and safer to operate.

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 discloses a small modular hydrogen liquefaction and intelligent filling system and method. The system is integrated in a container module and comprises a pretreatment purification module connected with a raw material hydrogen source and used for purifying raw material hydrogen, a liquefaction module connected with the pretreatment purification module and used for cooling and liquefying the purified hydrogen, and a liquid hydrogen storage and transportation and filling module connected with the liquefaction module and used for storing liquefied hydrogen, the central control module is respectively connected with the pretreatment purification module, the liquefaction module and the liquid hydrogen storage and transportation and filling module and is used for controlling all the modules. According to the system, rapid deployment is achieved through modular design, low energy consumption and low cost are achieved by optimizing operation through a prediction algorithm, the system is particularly suitable for distributed hydrogen production scenes and small and medium-sized hydrogen refueling stations, and the problems that an existing large liquefying device is not flexible and a traditional refueling station depends on external hydrogen supply are effectively solved.

A device and a method for producing hydrogen and byproduct oxygen by using green electricity electrolyzed water are provided. The device comprises an oxygen purifying system, a heat exchange system, an air separation compression and expansion system, an air separation rectification system and a liquid oxygen storage system. The method comprises the following steps: first, purifying oxygen prepared by electrolyzing water by green electricity to remove impurities such as hydrogen, carbon monoxide, carbon dioxide and water in the oxygen, then feeding the pure oxygen into the heat exchange system, performing heat exchange liquefaction to obtain liquid oxygen, coupling the liquid oxygen generated by rectification of the air separation rectification system, and obtaining pressurized oxygen through the heat exchange system and the air separation compression and expansion system.

The disclosure describes processes which include cooling a natural gas product stream to a cryogenic liquid storage temperature by way of refrigeration streams which include a primary refrigeration stream, a secondary refrigeration stream, and a tertiary refrigeration stream in a refrigeration system. After leaving the refrigeration system, the pressure of each refrigeration stream is increased, and upon reaching a sufficient pressure, the refrigeration streams are recycled to flow back into the refrigeration system as a recycle stream. The disclosure further describes systems capable of performing the processes. The processes and systems can include one or more sensors and one or more controls capable of adjusting a flow rate, flow volume, and / or flow ratio among one or more gas streams to maximize cooling efficiency based on monitoring from the one or more sensors. Mobile natural gas liquefaction systems are also described.

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 seabed sand liquefaction test system, which relates to the technical field of underground or underwater structures and comprises a mounting platform, a buoyancy system, an excitation system, a probe rod and a penetration system. Wherein all the systems are installed on an installation platform, and the platform is connected with an overwater facility through a cable. The excitation system and the penetration system are stacked and connected through a floating connecting structure, and the probe rod sequentially penetrates through the excitation system and the penetration system; the penetration system is provided with a penetration power unit, a transmission mechanism, a symmetrical double-head rocker arm and a feeding wheel, the transmission mechanism is connected with a torque retainer in series, and a reversing mechanism is arranged and can drive the rocker arm to move in a mirror image mode, so that the feeding wheel clamps the feeler lever to achieve penetration or lifting. The floating connection isolates vibration and prevents resonance and data noise; the torque retainer realizes fixed-torque clamping and is simplified into a single-power unit, so that the cost is reduced, and faults are reduced; the rocker arm can release the probe rod, retention is achieved without auxiliary equipment, lifting, slipping and clamping stagnation are prevented, and the testing efficiency, reliability and data precision are improved.

The application discloses a flue gas purification device and method for thermal power plants, which comprises a combined installation cylinder, one end of the combined installation cylinder is provided with a positioning installation sleeve, and the other end of the combined installation cylinder is provided with a positioning installation cylinder, further comprising: a threshold capture leading-out mechanism and a sequential processing mechanism matched with the threshold capture leading-out mechanism, which can be quickly combined and installed according to different purification requirements, realize multi-level purification operation, and have transportation convenience and maintainability; can synchronously realize liquefaction promotion of fine particulate matter capture effect, and automatically periodically clean and process captured substances through a threshold mechanism, while cooperating with passive centrifugal oscillation demolding, so that the substance capture capacity of the device is stably maintained for a long time, so as to improve the efficiency and service life of the device; can improve the particle adsorption effect through the heat absorbed by condensation, and optimize the acid-base washing structure, further improve the purification level of the device.

The invention belongs to the technical field of ships, and provides a large bulk cargo ship high-pressure CO2 storage system based on seawater cold insulation, which comprises a high-pressure storage tank, a storage tank cavity, a temperature sensor, a control unit, a supercharging device, a pressure sensor, a cooling device, an electromagnetic valve, a safety valve, a seawater valve, a seawater pump, an inlet valve, a release valve, a return valve, a drain valve and a void chamber. CO2 is pressurized, seawater is utilized for sufficient heat exchange, the pressure of the high-pressure storage tank is at the lowest pressure corresponding to the temperature of the seawater, power consumption of the pressurizing device is greatly reduced, and compared with a low-temperature CO2 liquefaction mode which needs large low-temperature refrigeration power consumption, the high-pressure storage tank does not need to consume power for refrigeration and heat preservation, the power consumption is lower. And meanwhile, liquefied CO2 is stored in the high-pressure storage tank, and seawater is utilized to fully exchange heat with the liquid CO2 in the high-pressure storage tank, so that the CO2 in the high-pressure storage tank is always kept in a liquid state, and the condition that the weight of the CO2 loaded in a single high-pressure storage tank is reduced due to the fact that the CO2 is in a gaseous state is avoided.

The invention provides a ternary precursor wastewater deamination method and device, and belongs to the technical field of wastewater treatment.The ternary precursor wastewater deamination device comprises a deamination system and an ammonia liquefaction system, the deamination system comprises a supergravity bed, a liquid inlet of the supergravity bed is connected with a wastewater preheating system, and a liquid outlet of the supergravity bed is connected with an ammonia liquefaction system; the liquid outlet is connected with the reboiling system, and the gas outlet is connected with the condensing system. The method comprises the following steps: adjusting the pH value of a wastewater raw material, heating, rectifying the heated wastewater raw material through a supergravity bed, reboiling the separated liquid, refluxing into the supergravity bed, condensing the separated gas, carrying out gas-liquid separation, and compressing and condensing the separated ammonia gas to obtain liquid ammonia; and the separated liquid flows back into the supergravity bed or enters the stronger ammonia water storage tank to be stored. The ammonia concentration of the deaminated wastewater is lower than 10mg / L, and concentrated ammonia water with the mass concentration of 15-20% and liquid ammonia with the purity of more than 99% can be recovered. Recycled stronger ammonia water and liquid ammonia can be reused for production.

The present application provides a steel pipe pile vertical bearing capacity estimation method and system, relates to the field of pile foundation engineering technology field, the present application carries out static sounding test to the seabed stratum required to be set for the steel pipe pile foundation, obtains experimental data and carries out normalization processing, divides the soil behavior type, and inverts the soil layer mechanical parameter; based on the soil layer mechanical parameter, the side friction and the end resistance of the steel pipe pile are calculated, and the initial static ultimate bearing capacity is obtained; the historical equivalent cyclic load experimental data of the construction sea area wave are obtained, the equivalent cyclic load reduction coefficient, the liquefaction reduction coefficient and the time-varying corrosion reduction coefficient are constructed, and the comprehensive time-varying reduction coefficient is constructed; based on the comprehensive time-varying reduction coefficient, the initial static ultimate bearing capacity is corrected, the vertical bearing capacity of the steel pipe pile in the long-term service period is predicted, and the time-varying ultimate bearing capacity is obtained; according to the time-varying ultimate bearing capacity, the evaluation threshold is set, the bearing capacity classification threshold interval is dynamically adjusted, and the bearing capacity classification evaluation result is output.

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.