2255results about "Liquefaction" patented technology

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 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.

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 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.

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.

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 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.

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

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.

Provided are a natural gas helium extraction device and a natural gas helium extraction method. The natural gas helium extraction device comprises a primary concentration part, a dehydrogenation and dehydration part, a secondary concentration part, and a final purification part. The primary concentration part comprises a first compressor, a first preheater, and a first membrane separator connected in sequence. The dehydrogenation and dehydration part comprises an oxygen delivery pipe, a mixer, a plurality of dehydrogenation towers connected in parallel, a low-temperature water separator, and a water remover. The secondary membrane separator of the secondary concentration part comprises a permeate gas outlet and a non-permeate gas outlet. The non-permeate gas outlet is connected to the primary concentration part. The final purification part comprises a nitrogen circulating cooling component and a pressure swing adsorption (PSA) device. The PSA device is connected to the permeate gas outlet of the secondary membrane separator and is used to output high-purity helium. The nitrogen circulating cooling component, the PSA device, and the low-temperature water separator form a cooling loop. The natural gas helium extraction device and the natural gas helium extraction method can significantly reduce safety risks and effectively reduce equipment costs.

Plant and method for producing hydrogen at cryogenic temperature, comprising: an electrolyzer; a hydrogen circuit to be cooled, comprising an upstream end connected to the hydrogen outlet and a downstream end to be connected to a member for collecting cooled and / or liquefied hydrogen, the plant also comprising a set of heat exchanger(s) in heat exchange with the hydrogen circuit to be cooled, the plant comprising at least one cooling device in heat exchange with at least a portion of the set of heat exchanger(s), the plant further comprising an oxygen circuit comprising an upstream end connected to the oxygen outlet and a downstream end, the oxygen circuit comprising a system for expanding the oxygen stream and at least one heat exchange between the expanded oxygen stream and the hydrogen circuit to be cooled, characterized in that the oxygen circuit comprises at least one oxygen compressor arranged upstream of the oxygen stream expansion system, the oxygen stream expansion system comprising an expansion turbine and in that said expansion turbine and said compressor are coupled to the same rotating shaft to transfer expansion work from the pressurized oxygen stream to the compressor in order to compress the oxygen stream upstream of the turbine.

A process for the production of hydrogen is described comprising the steps of: (i) subjecting a gaseous mixture comprising a hydrocarbon and steam to steam reforming in a reforming unit comprising an autothermal reformer to generate a reformed gas mixture; (ii) increasing the hydrogen content of the reformed gas mixture by subjecting it to one or more water-gas shift stages in a water-gas shift unit to provide a hydrogen-enriched reformed gas; (iii) passing the hydrogen-enriched reformed gas and an oxygen-rich gas to an oxidation unit containing an oxidation catalyst that converts carbon monoxide present in the hydrogen-enriched reformed gas to carbon dioxide, to form a carbon dioxide-enriched gas mixture; and (iv) passing the carbon dioxide-enriched gas mixture to a product separation unit to provide a hydrogen gas stream, a carbon dioxide gas stream and a by-product gas stream, wherein at least a portion of the by-product gas stream is compressed and recycled to one or more of the reforming unit, the water-gas-shift unit, the oxidation unit, and the product separation unit.

The invention relates to the technical field of intelligent control, and discloses a combined refrigeration liquefaction intelligent control system which comprises a natural gas combined refrigeration liquefaction process unit, a BOG recycling and isolated network power generation unit and a self-adaptive intelligent control system. The core of the system is that a safe, efficient and economical liquefaction recovery mode aiming at scattered gas well mouths which are short in life cycle, fast in gas quantity attenuation, weak in field infrastructure and simple in operation and maintenance personnel is realized through a combined refrigeration liquefaction process, BOG (Boil Off Gas) recovery and utilization, isolated network power supply and full-system self-adaptive intelligent control mode. And the adaptive intelligent control system evaluates the health condition of the equipment in real time and predicts the dynamic change of the process by constructing a digital twinborn model synchronous with the physical system. Based on the global optimization and self-healing control module, rolling optimization solution is carried out by taking a comprehensive operation cost as a target function, and a control instruction considering both production efficiency and equipment protection is generated.

The invention belongs to the technical field of alkane cracking processes, and provides an alkane raw material treatment device and method capable of efficiently recycling raw material cold energy, the alkane raw material treatment device comprises a gasification assembly, the gasification assembly comprises a throttle valve, the discharge end of the throttle valve is communicated with a cold end flow channel of a cold energy heat exchanger, and a hot end flow channel of the cold energy heat exchanger is circularly connected with a cold energy user; the gas-liquid separation assembly comprises a gas-liquid separation tank, a gas phase outlet of the gas-liquid separation tank is communicated with compression equipment, and a liquid phase outlet of the gas-liquid separation tank is communicated with a liquid alkane vaporizer; the raw material heating assembly comprises a raw material superheater, a feeding port of the raw material superheater is communicated with a discharging port of the compression equipment, and a discharging port of the raw material superheater is communicated with follow-up processing equipment. In the alkane gasification process, the alkane cooling capacity can be efficiently and stably recycled and utilized, and the purposes of reducing cost and improving efficiency can be achieved.

The invention relates to an installation for liquefying hydrogen, comprising a circuit for hydrogen to be cooled, a set of heat exchanger(s) in heat exchange with the circuit, a cooling system comprising a refrigerator with a cycle of refrigeration of a first cycle gas comprising helium and / or hydrogen, the circuit comprising at least one catalysis section so as to ensure conversion of the ortho-hydrogen into para-hydrogen, the circuit further comprising a first bypass portion bypassing at least one catalysis section, the downstream end of the circuit comprising two parallel branches that are not combined and are supplied respectively with the hydrogen that has passed through the first bypass portion and hydrogen that has passed through the catalysis section so as to provide two distinct hydrogen streams that have different relative proportions of ortho-hydrogen and para-hydrogen.

The invention discloses a compressed carbon dioxide energy storage method and system coupled with a heat supply generator set. The method comprises the steps that S1, an energy storage medium is prepared, and energy is stored; s2, performing energy release; s3, the intelligent control module carries out cooperative regulation and control: collecting each energy flow parameter and each equipment stress parameter, carrying out grid division, and retaining each key solution based on epsilon-dominated solution distribution; constructing an objective function and setting constraint conditions; population updating is carried out on the target function, and a current optimal working condition and adjustment parameters of each device are obtained; and the intelligent control module controls the equipment. According to the invention, CO2 separated and purified from boiler flue gas is used as a cycle working medium, energy conversion core cycle of compression heat storage-expansion energy release is combined with a fused salt heat storage tank and intelligent control, efficient storage, release and poly-generation utilization of energy are realized, the core process comprises three stages of carbon medium preparation, energy storage and energy release, and the energy storage and the energy release are integrated. And poly-generation utilization and intelligent optimization control are realized.

The invention relates to the technical field of air separation, in particular to a pretreatment module of an air separation system, a high-purity air separation system and a control method.The pretreatment module comprises a precooling unit, and the precooling unit is connected with a cold source; the pre-cooling unit enables cooling water to circularly flow in the supercharging unit through a cooling water pipeline, and the supercharging unit comprises a first air compressor, a second air compressor, a high-temperature expansion machine supercharging end, a first supercharger after-cooler, a low-temperature expansion machine supercharging end and a second supercharger after-cooler which are sequentially connected in series through a main pipeline; supercharged and precooled air is expanded and cooled by the expansion unit and then enters the heat exchange unit; through the arrangement of the pre-cooling unit, the inlet and outlet temperatures of the high-temperature expansion machine and the low-temperature expansion machine are effectively controlled, reheated air returns to the air compressor, the expansion gas amount is increased, reheated gas continuously cools the air participating in rectification in the heat exchange unit, and in conclusion, the production energy consumption of a high-purity liquefied gas product is reduced.

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.

The integrated hybrid system for managing the production, flow, consumption and storage of energy is characterised in that it comprises a cryogenic liquefied air energy storage (7), to which, either upstream and / or downstream of the compressor, an system for transporting oxygen (D) obtained from the electrolyzer (11) is connected, while an system supplying heat (B) obtained during combustion of gas in the trigeneration unit (9) is incorporated in the liquid air and / or oxygen expansion station of the cryogenic liquid air energy storage (LAES) (7), wherein all energy processing and storage units are incorporated in the control and supervision system, collecting data in real time, monitoring the production, consumption and demand for electrical energy, and intelligently controlling energy flow between generation sources, powered devices and energy storage units.

The invention discloses a hydrogen liquefaction control method and system based on AI decision making. The method comprises the steps that real-time operation data and parameters of a hydrogen liquefaction device are obtained; based on the real-time operation data and the parameters, a fuzzy clustering algorithm is utilized to identify the current working condition so as to determine the working condition type to which the current working condition belongs; based on the working condition type, a reinforcement learning algorithm is utilized to generate a target control strategy, and the target control strategy comprises at least one control strategy of the yield, the energy consumption and the equipment service life early warning of the hydrogen liquefaction device; and according to the target control strategy, utilizing a particle swarm optimization algorithm to adjust PID parameters of the hydrogen liquefaction device so as to control at least one of yield, energy consumption and equipment life early warning of the hydrogen liquefaction device. The response speed, stability and anti-disturbance capability of the control loop of the hydrogen liquefaction device can be improved, dependence on experience of operators is reduced, performance degradation of the hydrogen liquefaction device is avoided, and efficient operation of the hydrogen liquefaction device is guaranteed.

The invention discloses a multi-device parallel cooling method for a cryogenic BOG reliquefaction device, and relates to the technical field of industrial cooling systems, and the method comprises the steps: fusing adaptive fuzzy PID control and a graph convolutional neural network, monitoring and predicting the thermal load of each device to be cooled of the cryogenic BOG reliquefaction device in real time, and generating a dynamic cooling demand graph; and dynamically adjusting a cooling water flow distribution strategy of each parallel branch based on a thermal load prediction result. By fusing adaptive fuzzy PID control and the graph convolutional neural network, high-precision real-time prediction and modeling of dynamic thermal loads of multiple devices are achieved, a dynamic cooling demand graph is formed, the problem of uneven cooling in a traditional constant flow distribution mode is solved, a cooling water flow distribution strategy is intelligently generated according to the real-time thermal load difference of all the devices, and the dynamic cooling demand graph is obtained. Accurate cooling according to needs is achieved, local overheating or supercooling phenomena are effectively avoided, the equipment operation efficiency is remarkably improved, the service life is remarkably prolonged, and long-term stable operation of the system is guaranteed.

The invention discloses a system and a method for directly preparing ultra-pure nitrogen through rectification dehydrogenation, and relates to the technical field of ultra-pure nitrogen preparation. The system for directly preparing ultra-pure nitrogen through rectification dehydrogenation comprises a main heat exchanger, the bottom of the main rectifying tower is communicated with the main heat exchanger through a pipeline; the subcooler is communicated with the top of the main rectifying tower through a pipeline; the top of the dehydrogenation high-purity nitrogen tower is communicated with the subcooler through a pipeline, a nitrogen exhaust port is formed in the bottom of the dehydrogenation high-purity nitrogen tower along the height of the dehydrogenation high-purity nitrogen tower, and the nitrogen exhaust port is connected with the main heat exchanger through a pipeline. According to the invention, most of substances including oxygen, argon, methane and the like and having higher boiling points than nitrogen in raw material air are separated from nitrogen through the main rectifying tower, impurities having higher boiling points than nitrogen sink while hydrogen is evaporated through the dehydrogenation high-purity nitrogen tower, and vaporized ultra-pure nitrogen is taken out from the side surface of the dehydrogenation high-purity nitrogen tower, so that the purity of the raw material air is improved. Therefore, the purity of the prepared high-purity nitrogen is improved.

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.

A carbon capture system for an LNG fueled power plant (1) and method for LNG combustion and carbon capture, wherein the method comprises - gasifying the LNG stream by heating to obtain a gasified NG stream - combusting the gasified NG stream to obtain exhaust gas stream- separating water from the cooled exhaust gas stream to obtain a dry exhaust gas stream - adsorbing CO2 from the dry exhaust gas stream to obtain a CO2 depleted exhaust gas stream - desorbing CO2, pressurizing it and cooling it with the cold from the gasification of the LNG - separating CO2 from the desorbing stream.

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.

In a process in which ammonia is cracked to form a hydrogen gas product and an offgas comprising nitrogen gas, residual hydrogen gas and residual ammonia gas, residual ammonia is recovered from the offgas from the hydrogen recovery process by partial condensation and phase separation, and hydrogen is recovered from the resultant ammonia-lean offgas by partial condensation and phase separation. The recovered ammonia may be recycled the cracking process and the recovered hydrogen may be recycled to the hydrogen recovery process to improve hydrogen recovery from the cracked gas. Overall hydrogen recovery from the ammonia may thereby be increased to over 99%.

A cold energy recovery facility includes a liquid hydrogen tank configured to store liquid hydrogen a first circuit configured to circulate a first working medium, a second circuit configured to circulate a second working medium having a freezing point higher than the first working medium, a first turboexpander provided in the first circuit, the first turboexpander being configured to be driven by the first working medium in a gas state, a second turboexpander provided in the second circuit, the second turboexpander being configured to be driven by the second working medium in a gas state, a first heat exchanger configured to vaporize the liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium, a second heat exchanger configured to vaporize the first working medium in a liquid state by heat exchange with the second working medium, and a third heat exchanger configured to vaporize the second working medium in a liquid state by heat exchange with a heat medium, wherein the first circuit and the first turboexpander form a part of a first thermodynamic cycle that uses the liquid hydrogen as a low-temperature heat source in the first heat exchanger, and the second circuit and the second turboexpander form a part of a second thermodynamic cycle that uses the first working medium as a low-temperature heat source in the second heat exchanger.

Flow from a gas well is conditioned prior to a production pipeline. A flow line is coupled to a gas well to receive the gas and coupled to a production pipeline to direct the received gas away from the production site, the flow line residing at a production site and comprising an electric power generation system. The electric power generation system has a turbine generator. The inlet nozzle and turbine wheel of the turbine generator is configured to reduce the pressure and temperature of the received gas to conditions associated with the production pipeline.