A method for controlling an oxygen liquefaction device includes measuring a flow rate from an oxygen concentration subsystem to a liquefaction subsystem, comparing the flow rate to a flow rate setpoint, and adjusting a cycle timing of the oxygen concentration subsystem in accordance with the comparing. A device for producing liquid oxygen, includes an oxygen concentrator, a liquefaction system, that receives oxygen enriched gas from the concentrator, and condenses it to produce a liquid product. The device further includes a liquid product storage tank, a sensor, that measures a flow rate from the oxygen concentrator to the liquefaction system and a controller that adjusts an oxygen concentrating cycle time in response to the measured flow rate.

Processes and apparatuses for operating a centrifugal gas compressor. A storage tank containing a liquid buffer material is provided and used to offset density fluctuations in the gas stream passed to the compressor. The storage tank may contain a component of the high-pressure gas stream provided by the compressor, such as carbon dioxide.

The available gas separation techniques in the industry includes many drawbacks such as particle attrition, low adsorption rate, gas leakage and the like. The disclosed screw motion assisted modular rotary true moving bed for gas separation provides a design which helps to overcome these drawbacks. The disclosed gas separator includes an inner casing with a screw like threading on it which enables both rotational and translational movement by employing a prime driver outer casing driven by an elector-mechanical mechanism. This enables the usage of particulate adsorbent material in an efficient way. The disclosed design enables a greater exposure of the particulate adsorbent material which results in higher surface area availability for adsorption. The design of the screw motion assisted modular rotary true moving bed helps in using it in small-scale gas separation such as carbon dioxide capture from car exhaust and so on.

An integrated temperature swing adsorption (TSA) process and gas fermentation process and device is disclosed. A heated tail gas stream from the gas fermentation process is used to heat and regenerate adsorbent in the TSA device. A portion of treated feedstock from the TSA device is used to cool the regenerated adsorbent. Integration of a tail gas stream from the gas fermentation zone used for regeneration of absorbent in the TSA eliminates the need for an inert gas regenerant and using TSA treated gas feedstock for cooling regenerated adsorbent allows for maximum recovery and use of available gas feedstock. Alternatively, when a pressure swing adsorption (PSA) process is also employed, a purge stream from the PSA may be used as regenerant in the TSA process.

Processes and apparatuses for reducing molecular weight fluctuation in a tail gas stream from a pressure swing adsorption process. Multiple PSA separation zone are synchronized such that when one of the PSA units is generating a low molecular weight tail gas, there is another PSA unit generating a high molecular weight tail gas.

The present invention relates to a method and system for improving VPSA plant energy and capital efficiency through optimizing direct drive variable speed centrifugal feed, vacuum, and/or product compressors to achieve lower unit gas product production cost. More specifically, the present invention relates to a new energy efficient VPSA process and system which employs high speed direct drive centrifugal compressors to achieve wider production range. Significant lower energy consumption can be achieved over the plant operation life by employing compressors sized with average ambient and production demand, utilizing direct drive variable high speed centrifugal compressors' speed and operating range to meet the desired production demand. Since majority of the plants tend to run at below peak production most of operating life of the plant. In addition, the smaller size machine offers plant capital savings from the initial investment.

A carbon dioxide recovery device is provided having high energy efficiency which can curtain the energy required in temperature rise of a sorbent material in a desorption process by enabling utilization of heat of adsorption. A carbon dioxide recovery device includes: a module including a sorbent material inside thereof, and executes an adsorption process of aspirating gas containing carbon dioxide and adsorbing the carbon dioxide to the sorbent material; and a desorption process of desorbing the carbon dioxide from the sorbent material by heating in a state where a periphery of the sorbent material is reduced pressure; and a tank storing a cooling medium for the module, in which the adsorption process performs heat recovery by flowing the cooling medium to the module, when a difference between a temperature of the sorbent material and a temperature of the cooling medium in the tank is a first threshold or more.

The present invention provides an integrated hydrogen production and charging system, including a hydrogen generator, a compressor, a heat exchanger, a pressure swing adsorption device, a vacuum pump, and a hydrogen charger. The hydrogen generator generates hydrogen by methanol reforming. The hydrogen generator makes the generated hydrogen pass through a palladium membrane purification device in the hydrogen generator for a first purification. The compressor compresses the hydrogen from the hydrogen generator. The heat exchanger, connected to the compressor, cools down the compressed hydrogen. The pressure swing adsorption device, connected to the heat exchanger, performs a second purification on the cooled down hydrogen by adsorption. The vacuum pump, connected to the pressure swing adsorption device, depressurizes the pressure swing adsorption device during desorption. The hydrogen charger charges the hydrogen from the pressure swing adsorption device into one or more metal alloy hydrogen storage tanks.

A carbon dioxide recovery facility includes: an adsorption tower filled with carbon dioxide adsorbing material; a suction machine which vacuum-suctions the inside of the adsorption tower; a discharge line connected to a discharge port of the suction machine; a carbon dioxide recovery line connected to the discharge line; a recovery gas valve provided in the carbon dioxide recovery line; a non-recovery gas line connected to the discharge line; a non-recovery gas valve provided in the non-recovery gas line; and a control device. The control device closes the recovery gas valve and opens the non-recovery gas valve when the pressure in the adsorption tower is a low vacuum based on a predetermined recovery pressure and closes the non-recovery gas valve and opens the recovery gas valve when the pressure in the adsorption tower is a high vacuum based on the recovery pressure.

The invention relates to a method for regulating a unit for separating a gas stream, having P adsorbers, where P2, each following a PSA-type adsorption cycle with a phase time shift, the method involving the steps of operating the unit according to the nominal cycle when the required flow rate is equal to a nominal flow rate or optionally when the required flow rate is higher than the nominal flow rate, and operating the unit according to the reduced cycle when the required flow rate is lower than or equal to a predetermined flow rate, the predetermined flow rate being lower than the nominal flow rate.