3696results about "Liquefaction" patented technology

The invention relates to the technical field of automatic control, in particular to an automatic control method of a BOG low-temperature recovery system for a storage tank for an LNG (liquefied natural gas) ship, which comprises the following steps: acquiring BOG pressure fluctuation data and temperature difference trend, analyzing pressure rise rate and cooling efficiency change, identifying a pressure peak value and a cooling lag section, screening a low-efficiency section and marking an optimization unit. And identifying an energy matching degree, analyzing energy loss distribution, identifying an over-limit node and a fault signal, and obtaining an energy and fault synchronous control table. According to the system, through real-time data monitoring and intelligent analysis, the BOG recovery process can be accurately controlled, energy circulation and cooling treatment can be optimized, the efficiency of a low-temperature recovery system can be improved, BOG pressure and temperature difference changes can be monitored, pressure fluctuation and cooling lag can be analyzed, continuous improvement of condensation efficiency can be ensured, control parameters can be accurately adjusted, energy loss is avoided, and the energy efficiency of equipment can be improved; energy consumption and equipment fault management are optimized, and efficient and safe operation of the low-temperature recovery system is ensured.

A system and method for liquefying a hydrogen gas feed stream uses a pre-cooling refrigerant for pre-cooling the feed stream, where the pre-cooling refrigerant is compressed, cooled and then separated to provide high pressure mixed refrigerant vapor and liquid streams. The high pressure vapor stream is cooled and directed to a cold vapor separator where cold separator liquid and vapor streams are formed. The cold separator vapor stream is cooled and expanded to provide a pre-cool refrigeration stream in a heat exchanger system. The high pressure pre-cooling refrigerant liquid and cold separator liquid streams are cooled and expanded and directed to the pre-cool refrigeration stream. A high pressure primary refrigerant steam, after compression and cooling, is further cooled in the heat exchanger system and then expanded using warm and cold expanders, with the resulting expanded primary refrigerant streams used to liquefy the pre-cooled hydrogen feed stream via heat exchange in the heat exchanger system.

Example gas recovery systems include a source gas conditioning assembly configured to condition and compress the inlet source gas to provide a conditioned source gas, a first membrane assembly configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly fluidly coupled to the hydrocarbon enriched stream, and configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide (CO2) plant assembly fluidly coupled to the recovery stream configured to provide a carbon dioxide product stream and an enriched recycle stream, a standalone membrane assembly configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream, and wherein the source gas conditioning assembly is fluidly coupled to the recycle stream and the hydrocarbon enriched recycle stream.

The invention provides a polymer devolatilization process and a devolatilization system. The devolatilization process comprises the following steps: heating a polymer raw material containing volatile components to obtain a molten polymer, pressurizing the molten polymer, mixing with an entrainer, and feeding into a falling film device; after sudden pressure drop and heating, the entrainer carries volatile components to be separated from the system, and a devolatilization product is obtained; the mass ratio of the polymer raw material to the entrainer is (10: 1)-(10000: 1). According to the polymer devolatilization process provided by the invention, the entrainer with a low boiling point is introduced into a reaction system, a large number of microbubbles are formed through vaporization of the entrainer and azeotropy of volatile components, removal of the volatile components in the material is enhanced through pressure swing flash evaporation, and extremely low pressure does not need to be reached in a devolatilization device.

The embodiment of the invention provides a liquid air energy storage system and a liquid air energy storage method.The liquid air energy storage system comprises an air compressor, a cooler set, an air throttling device, a gas-liquid separator, a liquid air storage tank, a first refrigeration compressor and a first refrigeration throttling device; the cooler set is provided with a first cooling channel, a second cooling channel, a third cooling channel and a first refrigerant channel, the input end of the third cooling channel is used for being connected with the output end of the cold storage medium cold tank, and the output end of the third cooling channel is used for being connected with the input end of the cold storage medium hot tank; the input end of the first refrigerant channel is connected to the output end of the first refrigeration throttling device, and the output end of the first refrigerant channel is connected to the input end of the first refrigeration compressor; the output end of the first refrigeration compressor is connected to the input end of the first refrigeration throttling device. According to the technical scheme, cold sources of the system can be more diversified, and stable operation of the system under different loads is facilitated.

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 utility model provides a compound device for providing feed gas for preparing green ammonia from new energy and a green ammonia synthesis system. The composite device comprises a deep cooling air separation nitrogen generation subsystem, a hydrogen supply subsystem and a main heat exchanger, and the hydrogen supply subsystem comprises a water electrolysis hydrogen generation unit, a first hydrogen compressor, a second hydrogen compressor, a hydrogen storage tank and a hydrogen conveying pipeline. The hydrogen conveying pipeline comprises a first hydrogen conveying pipeline, a second hydrogen conveying pipeline and a third hydrogen conveying pipeline; the main heat exchanger is a multi-channel heat exchanger and comprises a first flowing channel used for flowing of a first medium and a second flowing channel used for flowing of a second medium, the second hydrogen compressor is connected with the hydrogen storage tank through the first flowing channel, and the hydrogen storage tank is connected with the third hydrogen conveying pipeline through the second flowing channel. The composite device provided by the utility model can ensure the supply stability of the raw material hydrogen of the ammonia production subsystem, and solves the technical problem that the hydrogen supply is unstable in the existing green ammonia synthesis process.

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 provides a neon removal system for producing high-purity helium, and particularly relates to the technical field of gas purification, and the neon removal system for producing the high-purity helium comprises a circulation unit and a purification unit, wherein the circulating unit comprises a compressor, an oil filtering device, a first heat exchanger, a second heat exchanger, a first adsorber group, a third heat exchanger, an expansion machine and a fourth heat exchanger; the circulating unit further comprises a liquid nitrogen source, a pipeline of the liquid nitrogen source is connected with one inlet of the second heat exchanger, and the liquid nitrogen source is connected to the outside from an outlet of the second heat exchanger; the purification unit comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a second adsorber group, through pre-cooling of the liquid nitrogen source and expansion of the expansion machine, the raw material helium is cooled to 20 K, then freezing condensation separation is conducted through the second adsorber group in the 20 K temperature zone, and high-purity helium which is lower in neon content and meets the requirement can be obtained.

A liquid cryogen stored in a liquid cryogen space of a closed insulated cryogenic storage vessel is subcooled by allowing it to enter into a conduit disposed in the liquid cryogen space where it is expanded by a pressure reducer in the conduit, thereby producing a cooled biphasic mixture of the cryogen in liquid and vaporized forms. The cooled biphasic mixture has a temperature lower than that of the liquid cryogen in the liquid cryogen space. Heat is transferred across the conduit from the liquid cryogen in the liquid cryogen space to the cooled biphasic mixture.

The utility model belongs to the technical field of ultralow-vibration low-temperature refrigeration, and particularly relates to a dry-type ultralow-vibration closed-cycle low-temperature liquefaction system which comprises a liquefier part, the liquefier part is connected with a low-temperature thermostat part through a low-loss liquid conveying pipe part, and the low-temperature thermostat part is connected with the liquefier part through a circulation gas circuit part. According to the dry-type ultralow-vibration closed-cycle low-temperature liquefaction system, a first-stage cold head and a second-stage cold head in a refrigerating machine are arranged to reach 40K and 4K respectively, due to the air pressure difference, high-purity helium entering the first-stage cold head for heat exchange can be subjected to heat exchange to reach 40K, then enters a second-stage cold head heat exchanger to be subjected to heat exchange to reach 3K, and then passes through a low-temperature needle valve, so that the temperature of a low-temperature thermostat is reduced to be between 2 and 3k, and therefore the heat exchange efficiency is improved. Helium subjected to heat exchange is pumped away through the circulating pump for circulation, the low-loss liquid conveying pipe is fixed, and vibration transmitted by the liquefier part can be filtered.

The invention relates to the technical field of carbon dioxide capture, and provides a carbon capture system and a carbon capture method.The carbon capture system comprises a denitration and desulfurization device, a compression device, a refrigeration device and a cold rectification device, and the inlet side of the denitration and desulfurization device is used for introducing carbon-containing waste gas; the denitration and desulfurization device, the compression device and the cold rectification device are sequentially connected through a pipeline, and the pipeline between the compression device and the cold rectification device is thermally conducted with the refrigeration end of the refrigeration device; the cold rectification device comprises a cold rectification tower, and at least one of the inlet side and the outlet side of the cold rectification tower is in thermal conduction with the refrigeration end of the refrigeration device. The problem that the energy utilization rate is low in carbon dioxide capture, utilization and storage can be solved.

A gas supply system for a high-pressure gas consuming appliance and a low-pressure gas consuming appliance of a floating structure including a tank containing the gas is disclosed. The supply system includes: a first supply circuit and a second supply circuit; a gas return line; and a first heat exchanger and a second heat exchanger configured to carry out a heat exchange between the gas of the first supply circuit and the gas circulating in the return line. The first supply circuit includes an additional pump.

The invention relates to a natural gas liquefaction process using supersonic velocity spray pipe precooling. The system comprises a pre-cooling unit, a deep cooling unit, a heat exchange unit and a natural gas liquefaction unit. The pre-cooling unit comprises a supersonic spray pipe and a throttle valve; the cryogenic unit comprises a throttle valve, a compressor, a cooler, a component distributor and a mixer; the heat exchange unit comprises a heat exchanger; the natural gas liquefaction unit comprises a throttle valve and a separator. According to the production process, the technical scheme of supersonic spray pipe precooling and mixed refrigerant circulating cryogenic cooling is adopted. Compared with other processes, the process has the advantages of low refrigerant consumption, low energy consumption, high natural gas liquefaction rate, low process complexity, low equipment investment, good environmental protection benefit and the like under the same condition, and can efficiently recover the natural gas condensate (NGL) while precooling.

The invention discloses a hydrogen low-temperature precooling device and method with oxygen liquefaction, relates to the technical field of low-temperature refrigeration and hydrogen energy liquefaction, and is particularly suitable for cooperative utilization of a hydrogen-oxygen co-production system in green hydrogen production. The device comprises a hydrogen pre-cooling cold box, a liquid oxygen cold box, a mixed refrigerant compression and heat exchange system, a nitrogen circulating refrigeration system and a trace oxygen analyzer arranged in a nitrogen loop. The raw material hydrogen is subjected to purification, precooling, adsorption and ortho-parahydrogen conversion treatment to obtain liquefiable precooled hydrogen; a liquid oxygen product is output after raw material oxygen is purified and liquefied through heat exchange. According to the device, cryogenic heat exchange is achieved through two-stage circulation of mixed refrigerants and nitrogen, a multi-temperature-zone segmented heat exchange network is constructed through multiple separation tanks and a throttling path, and the refrigeration efficiency and the heat recovery capacity are both considered. And liquid oxygen cooling can be dynamically regulated and controlled through a temperature-regulating nitrogen path to adapt to various working conditions of the electrolytic cell. The device is compact in structure, high in safety, excellent in energy efficiency and suitable for the hydrogen-oxygen synergistic liquefaction treatment scene in a water electrolysis hydrogen production device.

The invention provides a vacuumizing system and a cold trap thereof. The cold trap comprises an inner container, a first shell and a second shell which are sequentially arranged at intervals from inside to outside. A storage cavity used for containing a low-temperature medium is formed in the inner container in a hollow mode. The outer side face of the inner container forms a first cold face. The inner side face of the first shell and the outer side face of the inner container are enclosed to form a gas flow interlayer for gas to flow. The first shell is provided with an air inlet and an air outlet which are communicated with the airflow interlayer. A containing cavity is defined by the inner side face of the second shell and the outer side face of the first shell, the containing cavity is used for containing a low-temperature medium, and a second cold face is formed by the inner side face of the first shell. The first cold surface and the second cold surface are formed in the cold trap at the same time, so that the cold surface area of the cold trap is increased, the temperature difference between the inner side and the outer side of the airflow interlayer can be balanced, the guiding effect of the cold trap on the gas is enhanced, the adsorption and trapping capacity of the cold trap on impurity gas molecules in the gas is enhanced, and therefore the efficiency of the cold trap is improved.

The invention discloses a low-temperature cold trap water removal device which comprises more than two water removal channels which are connected in parallel; each water removal channel comprises a refrigeration water removal gas path and an ice melting purging gas path which are connected in series; each refrigeration and water removal gas path is also connected with an inlet of a dry gas collection gas path, and an outlet of the dry gas collection gas path is used for being connected with an analyzer; and each water removal channel is connected with a controller, and the controller is used for controlling the refrigeration water removal gas paths and the ice melting purging gas paths of the different water removal channels to operate in a staggered mode. According to the application, moisture in the gas to be dewatered can be effectively removed, frost can be timely removed, and related phenomena such as relatively large dead volume of the cold trap can be avoided.

A liquefier device which may be a retrofit to an air separation plant or utilized as part of a new design. The flow needed for the liquefier comes from an air separation plant running in a maxim oxygen state, in a stable mode. The three gas flows are low pressure oxygen, low pressure nitrogen, and higher pressure nitrogen. All of the flows are found on the side of the main heat exchanger with a temperature of about 37 degrees Fahrenheit. All of the gases put into the liquefier come out as a subcooled liquid, for storage or return to the air separation plant. This new liquefier does not include a front end electrical compressor, and will take a self-produced liquid nitrogen, pump it up to a runnable 420 PSIG pressure, and with the use of turbines, condensers, flash pots, and multi pass heat exchangers. The liquefier will make liquid from a planned amount of any pure gas oxygen or nitrogen an air separation plant can produce.

According to the equipment and the method, hydrogen is pre-cooled with a mechanical low-temperature pre-cooling cycle and a helium cycle through a first-stage heat exchanger, is subjected to ortho-secondary conversion through a second heat exchanger, a fourth heat exchanger and a fifth heat exchanger, and is subjected to heat exchange with cold helium discharged from a first turbo expander in the helium cycle; and liquid hydrogen generated after the liquid hydrogen enters the liquid hydrogen throttling valve to be throttled enters the liquid storage tank, and the hydrogen liquefaction process is completed. Helium entering and exiting the helium circulation low-temperature compressor unit is subjected to mechanical low-temperature precooling, the compression work is reduced through helium low-temperature compression, the expansion work is recycled through the turbo expander, and the thermodynamic efficiency of the system is improved; the hydrogen liquefying system only depends on the cooling capacity provided by the helium circulating system and the mechanical low-temperature pre-cooling circulating system, hydrogen liquefying can be completed without compression, and the system safety is improved; the helium circulation low-temperature compressor unit and the mechanical low-temperature compressor both adopt oil-free gas suspension centrifugal compressors, so that the problems of oil removal and oil return are avoided, and the reliability is remarkably improved.

A method for autonomously managing cooling down of a heat exchanger is provided. The method includes providing a machine learning algorithm trained using a training data set to solve an optimization problem. The training data set includes a surrogate model of a heat exchanger. The optimization problem, includes (i) an objective to be met by a solution of the optimization problem, the objective being minimizing the rate of cooling; (ii) a plurality of manipulated variables (MV's) including flow rates of refrigerant fluid and process fluid, where the solution includes values of MVs selected to meet the objective, and (iii) at least one constraint with which the solution complies, where the at least one constraint includes a flow rate limit of the heat exchanger. The method further includes managing cool down of the heat exchanger by the machine learning algorithm solving the optimization problem to provide values for the manipulated variables.

A method for providing a nitrogen product, an oxygen product and a hydrogen product, wherein an air separation installation is used which is designed for the low-temperature separation of feed air and which has a rectification column system, the rectification column system comprising an air-fed rectification column and a main heat exchanger. The provision of the nitrogen product comprises, in particular, subjecting feed air to low-temperature rectification using the air-fed rectification column such that a tops gas is obtained, and using part of the tops gas as the nitrogen product. The provision of the oxygen product and the hydrogen product comprises subjecting water to water electrolysis in an electrolyzer, such that a water-containing oxygen stream and a hydrogen stream are obtained, the water-containing oxygen stream or part thereof being subjected, at least in one operating phase, to drying and, in an unmixed state, to liquefaction in the air separation installation.

A carbon dioxide recovery device provided with a separation device that separates carbon dioxide from to-be-separated gas (for example, combustion exhaust gas) containing carbon dioxide, wherein: in order from the upstream side where the to-be-separated gas is supplied, the separation device and carbon dioxide sublimators, which sublimate (solidify) carbon dioxide that was separated in the separation device, are connected in series, refrigerant circuits in which a fluid having cold heat serves as the refrigerant, are connected to the carbon dioxide sublimators, and the refrigerant is used to sublimate (solidify) the carbon dioxide; and when the carbon dioxide is sublimated (solidified), the carbon dioxide sublimators are depressurized and set to negative pressure so as to draw in the carbon dioxide separated at the separation device.

Systems herein separate an inlet gas stream containing methane, C2 components, C3 components and optionally heavier hydrocarbons into a volatile gas fraction containing methane and a less volatile hydrocarbon fraction containing C2+ components. The system may include piping, valving, and controls configured to flexibly allow the system to operate in a high ethane recovery mode, a high throughput mode, or in some embodiments, a high propane recovery mode.

The utility model discloses a triple-nitrogen expanded natural gas cryogenic liquefaction system which comprises a nitrogen cooling channel, a first heat flow channel, a second heat flow channel, a third heat flow channel, a first cold flow channel, a second cold flow channel and a third cold flow channel, the first hot flow channel communicates with the first cold flow channel through a first expansion machine, and the second hot flow channel communicates with the second cold flow channel through a second expansion machine. The third hot flow channel is communicated with the third cold flow channel through a third expansion machine; the first-stage compressor assembly, the second-stage compressor assembly, the third-stage compressor assembly and the fourth-stage compressor assembly are communicated in sequence, an outlet of the second cold flow channel is communicated with the input end of the first-stage compressor assembly, an outlet of the third cold flow channel is communicated with the input end of the third-stage compressor assembly, and an outlet of the first cold flow channel is communicated with the input end of the fourth-stage compressor assembly; and the output end of the four-stage compressor assembly is communicated with inlets of the first, second and third heat flow channels. The system has the advantages that the energy consumption of natural gas liquefaction can be effectively reduced, and faults of the compressor can be effectively reduced.

Methods and systems for recuperating power from a pressurized fluid stream of a carbon capture system are disclosed. A compressor pressurizes the carbon dioxide containing feed fluid and passes this fluid stream through a carbon capture process. The pressurized stream is expanded across a turbine where power is recovered.

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 discloses a carbon dioxide energy storage system and a lubricating oil supply device and a control method thereof. The lubricating oil supply device comprises a first oil supply unit and a second oil supply unit which are connected between a lubricating oil tank and an energy storage assembly and between the lubricating oil tank and an energy release assembly respectively, and the first oil supply unit is configured to be capable of providing lubricating oil of a first oil quantity for the energy storage assembly and the energy release assembly; the second oil supply unit is configured to provide a second oil quantity of lubricating oil for the energy storage assembly and the energy release assembly; wherein the second oil supply unit is connected to a liquid storage unit in the carbon dioxide energy storage system, and high-pressure carbon dioxide gas in the liquid storage unit serves as a power source to drive the second oil supply unit to supply oil. According to the scheme, the driving control structure and the driving control process of the second oil supply unit for providing the accident lubricating oil can be simpler, the response speed is high, and the reliability of accident lubricating oil supply is effectively improved.

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.

A closed cycle power storage and generation system comprising compressed air storage J and liquefied air energy storage D, wherein air is compressed in a compressor A, before being cooled in a heat ex

Title: Process and installation for CO2 separation by partial condensation and / or distillation and by absorption. A first gas (19) containing CO2 is separated in a CO2 absorption unit (21) using a chemical solvent, producing a first stream (17) enriched in CO2 relative to the first gas. A second gas (9) containing CO2 is compressed in a first compressor (C1), cooled in a heat exchanger, and separated in a partial condensation and / or distillation unit (13), producing a second stream (15) enriched in CO2 relative to the second gas. The heat generated by the compression of the second gas in the first compressor is used to regenerate the chemical solvent in the absorption unit. Abstract figure: Fig. 1