1634results 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.

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.

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

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 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 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.

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.

Provided are an air separation device and an air separation method that have high argon yield without increasing the heat transfer area of a deoxidized argon condenser that generates reflux liquid in an argon tower generating deoxidized argon to be used as a raw material in a high-purity argon tower. Specifically provided is an air separation device comprising: an argon tower (700) that distills argon-containing oxygen drawn from a low-pressure tower (600) and generates deoxidized argon from which oxygen has been removed; a deoxidized argon condenser (400) that generates reflux liquid in the argon tower (700); a high-purity argon tower (800) that distills deoxidized argon and extracts pure argon from which nitrogen has been removed; a high-purity argon condenser (900) that generates reflux liquid for the top portion of the high-purity argon tower (800); a high-purity argon evaporator (910) that generates ascending gas for the bottom portion of the high-purity argon tower (800); a pipeline (622) that sends liquid nitrogen to the high-purity argon condenser (900) as a cooling medium; and a pipeline (42) that sends liquid derived from a high-pressure tower (500) to the high-purity argon evaporator (910) as a heating medium.

The application discloses a modular hydrogen liquefaction system, comprising: one or more parallelly arranged liquefaction modules, a hydrogen inlet of the liquefaction module being connected with a hydrogen source, and a product outlet of the liquefaction module being connected with one or more parallelly arranged liquid hydrogen storage tanks; each of the liquefaction modules is an integrated structure capable of hydrogen cooling, liquefaction, primary and secondary hydrogen conversion and independent start and stop. The application realizes hydrogen liquefaction by connecting a large number of refrigeration units in series and in parallel to form modules at different levels, can effectively utilize the benefit of large-scale production of standard refrigeration units, and reduces equipment cost. By controlling the number of different level modules and refrigeration units to be started, the application can also realize large-range liquid hydrogen production capacity adjustment. In addition, by using a regenerative refrigerator as a standard refrigeration unit, rapid cooling and instant shutdown can be realized, so that the system has the advantages of rapid start and stop. The above advantages make the application particularly suitable for matching with renewable energy to produce green liquid hydrogen.

The utility model discloses a system for efficiently preparing liquid nitrogen by using a two-stage membrane separation technology, and relates to the technical field of industrial purification and liquefied nitrogen. The membrane separation technology and the gas liquefaction technology are combined, so that nitrogen in air is purified, the residual pressure of medium-pressure gas is fully utilized to provide cold energy for high-concentration nitrogen liquefaction, and the residual potential energy of the high-concentration gas is utilized to improve the nitrogen generation efficiency. A compressor, a gas cooling module, a first-stage separator and a second-stage separator of the system are sequentially arranged in the flowing direction of air. A high-pressure outlet of the second-stage separator is communicated with a first hot end inlet of the first heat exchanger; a first outlet of the first heat exchanger is communicated with a hot end inlet of the second heat exchanger, a second hot end inlet is communicated with a side backpressure outlet of the first-stage separator, a second outlet is communicated with a cold end inlet of the second heat exchanger through an expansion machine, a third outlet is communicated with atmosphere, and the cold end inlet is communicated with a second outlet of the second heat exchanger; and a side backpressure outlet of the second-stage separator is communicated with the compressor.

The application discloses a direct air carbon dioxide capture and utilization system and method using LNG cold energy, which comprises an LNG gasification cold release device, an air carbon dioxide capture device and a carbon dioxide utilization device; ambient air is cooled and dehumidified by a low-temperature cold energy heat exchanger of the LNG gasification cold release device and then enters the air carbon dioxide capture device; when desorbing carbon dioxide, humid carbon dioxide released by the air carbon dioxide capture device is first cooled and dehydrated by the low-temperature cold energy heat exchanger of the LNG gasification cold release device, and then is cooled and liquefied by the low-temperature cold energy heat exchanger of the LNG gasification cold release device to obtain liquid carbon dioxide product. The application solves the problem that the capture efficiency of the direct air carbon dioxide capture system is easily affected by the humidity of ambient air, and through air cooling and dehumidification, humid carbon dioxide product gas is cooled, dehydrated, liquefied and dry ice is prepared, so that the cycle efficiency of air carbon dioxide capture and the system energy utilization efficiency are effectively improved.

Pure liquid nitrogen, liquid air or dirty liquid nitrogen generated by a rectifying tower of the air separation device is subjected to secondary pressurization through a hydraulic pump and then enters a main heat exchanger or a recooling device to recover cold energy, and high-pressure gas formed by heat absorption and gasification enters a high-pressure expansion machine to expand and do work; exhaust gas of the high-pressure expansion machine enters the rectifying tower to provide cold energy required by air separation, and pure nitrogen, waste nitrogen and pure oxygen which are discharged from the rectifying tower and are subjected to cold energy recovery through the main heat exchanger are output. The purposes of energy conservation and consumption reduction of the air separation device are achieved through the processes of primary pressurization of the compressor, secondary pressurization of the hydraulic pump, cold returning, gasification and expansion.

The invention discloses a waste heat CO2 energy storage system and method considering an electricity price season difference. The system comprises a continuous waste heat supply and heat storage module, a CO2 liquid-liquid compression energy storage module, a CO2 energy release power generation module, a refrigeration and circulation module and an intelligent control module. The method comprises the following steps of receiving 15 types of parameters acquired by a data acquisition unit through a control core unit, identifying a current season type through a season identification module, outputting a corresponding season identifier, and matching a corresponding electricity price according to a current time period type; and the control core unit calls corresponding logic from a corresponding season strategy library according to the season identifier, the current time period type and the real-time electricity price, and controls corresponding component equipment to operate through the execution interface unit. Through collaborative design of electricity price linkage scheduling, delay compensation, capacity balance and station service power optimization, the problems of low income, slow response, frequent start and stop and the like of an existing system are effectively solved.

The application discloses a two-step high-purity nitrogen preparation process, and a device required by the process comprises a filter, an air compressor, an air precooling system, a purification system, a main heat exchanger, a nitrogen column, a main condensation evaporator I, a supercooler, an argon removal column, a main condensation evaporator II and an expander. The raw material air is separated by a nitrogen column rectification to obtain pressure nitrogen, and then the pressure nitrogen is introduced into the argon removal column as raw material gas to continue rectification, so that high-quality nitrogen product and low-quality nitrogen product can be obtained at the same time, the high-quality nitrogen product can meet the production process requirements of high-end chips, and the low-quality nitrogen product can be supplied to users with relatively low requirements on impurities such as argon content and oxygen content, so that the demand of users on different quality nitrogen products can be met to the maximum extent. The application can also provide high-quality liquid nitrogen product.

The present application relates to a kind of natural gas combustion flue gas separation utilization method and its system, comprising the following steps: S1, the flue gas to be treated is catalytically oxidized, so that residual oxygen in flue gas is fully reacted and eliminated;S2, flue gas enters preheater, heat exchange is carried out in preheater, so that the heat of flue gas is reduced;S3, compressor is used to compress flue gas, the temperature of flue gas is increased after being compressed by compressor, high temperature flue gas enters heat exchanger and is cooled by cooling water, wherein the water vapor contained is formed into liquid after cooling and discharged etc..The present application has the advantages that: flue gas generated by natural gas combustion is compressed and two-stage expansion refrigeration is used, liquid carbon dioxide and liquid nitrogen are separated in turn. The separation and utilization of natural gas combustion flue gas are realized, and the carbon dioxide discharged to the atmosphere is significantly reduced.

Disclosed herein is a control system for a reliquefaction system for ships, in which boil-off gas generated from liquefied gas in an onboard storage tank is compressed by a compressor and the compressed boil-off gas is cooled and reliquefied through a heat exchanger. The control system includes: a reliquefaction line connecting the compressor to the storage tank; a control valve disposed downstream of the heat exchanger on the reliquefaction line to adjust a flow rate of boil-off gas flowing through the reliquefaction line; a flow rate regulator configured to control a degree of opening of the control valve; and a load controller configured to send a signal for adjusting a load of the reliquefaction system to the flow rate regulator, wherein, in the event of changes in load of the reliquefaction system, the load controller sends a predetermined set point indicative of a boil-off gas flow rate at a corresponding load to the flow rate regulator to adjust the load of the reliquefaction system.

Carbon dioxide re-liquefaction may be provided by a system capable of receiving a vented boiled off gas stream from a storage vessel at a first compressor; compressing the vented BOG stream at the first compressor into a first compressed BOG stream at a first pressure and a second compressed BOG stream at a second pressure, greater than the first pressure; cooling the first compressed BOG stream in a heat exchanger to produce a liquid stream by: cooling, via a refrigerant unit, the second compressed BOG stream to produce a first cold stream, of a temperature less than that of the first compressed BOG stream; exchanging heat from the first compressed BOG stream against tire first cold stream; and returning the liquid stream to the storage vessel.

The utility model relates to the technical field of air pre-cooling, and discloses an air pre-cooling mechanism of an air separation device, which comprises a pre-cooling box and filter components, the filter components are arranged on two sides of the outside of the pre-cooling box, a water pump is mounted at the top of the pre-cooling box, and the input end of the water pump is fixedly connected with a water inlet pipe. The output end of the water pump is fixedly connected with a connecting pipe, and a pre-cooling assembly is arranged in the pre-cooling box and used for cooling air. The pre-cooling assembly comprises a plurality of S-shaped condensation pipes, the S-shaped condensation pipes are arranged in the pre-cooling box, one ends of the multiple S-shaped condensation pipes are fixedly connected with a first combined pipe, and the other ends of the multiple S-shaped condensation pipes are fixedly connected with a second combined pipe. According to the utility model, the cooling liquid circularly flows through the specially designed pipeline and device to form a water curtain, and the contact area and time of the cooling liquid and the air are greatly increased and prolonged by virtue of the S-shaped condensation pipe, so that the heat exchange is more sufficient and efficient, and the air can be quickly cooled to a low-temperature state.

Systems and methods for processing gases are disclosed. A first cryogenic fluid stream is cryogenically separated from an air stream through an O2 production system. A first cryogenic column in a CO2 production system transfers heat to a first portion of the first cryogenic fluid stream. The CO2 production system separates carbon dioxide from a combustion product stream. A second cryogenic column in an N2 rejection system transfers heat to a second portion of the first cryogenic fluid stream. The N2 rejection system separates a second cryogenic fluid stream from a combustible carbonaceous gas fuel stream. The air stream transfers heat to a first portion of the second cryogenic fluid stream.

Synthesis method of a process gas rich in H2 / CO, or in NOx, or in HCN, or in CH2O, for the subsequent production of at least a chemical among hydrogen, ammonia, methanol, olefins / paraffins / alcohols by Fischer Tropsch synthesis, nitric acid, hydrogen cyanide, formaldehyde, comprising a direct cooling with nitrogen. The process gas is discharged at high temperature from a steam and / or CO2 reforming reactor or from an adiabatic oxidation reactor with oxygen-containing gas. The process gas at high temperature, before next unitary operations, is partially or totally cooled by mixing with a colder nitrogen stream.