A facility for recovering carbon dioxide from a feed gas flow, including a unit for treating the feed gas flow in order to produce, from feed gas flow, a carbon dioxide-rich gas flow and a nitrogen-rich gas flow, a compression stage for compressing the feed gas flow, an expansion stage capable of outputting mechanical energy generated by the expansion of the nitrogen-rich gas flow, a thermal device arranged to enable heat transfers to take place between the gas flow leaving the compression stage and the nitrogen-rich gas flow prior to expansion, and a device for utilising the mechanical energy output by the expansion stage.

Liquid air energy storage (LAES) systems with increased efficiency and operating profit obtained through rational selection and configuration of the equipment used and optimization of the configuration/parameters of such equipment. In various embodiments, the LAES system is intended for operation preferably in an environmentally-friendly stand-alone regime with recovery of hot thermal energy extracted from compressed charging air and cold thermal energy extracted from discharged air.

A LNG liquefaction plant system includes concurrent power production, wherein the refrigeration content of the refrigerant or SMR is used to liquefy and sub-cool a natural gas stream in a cold box or cryogenic exchanger. For concurrent power production, the system uses waste heat from refrigerant compression to vaporize and superheat a waste heat working fluid that in turn drives a compressor for refrigerant compression. The refrigerant may be an external SMR or an internal LNG refrigerant working fluid expanded and compressed by a twin compander arrangement.

The disclosure pertains to a plant for the production of ammonia. The ammonia is produced from hydrogen obtained by electrolysis of water. The electrolysis is powered by a renewable source of energy, complemented with power obtained from the plant during periods of low or no availability of the renewable energy. To this end, the plant is configured such that it can be operated in a charge configuration (obtaining and storing power) and a discharge configuration (employing said power).

A LNG liquefaction plant system includes concurrent power production, wherein the refrigeration content of the refrigerant or SMR is used to liquefy and sub-cool a natural gas stream in a cold box or cryogenic exchanger. For concurrent power production, the system uses waste heat from refrigerant compression to vaporize and superheat a waste heat working fluid that in turn drives a compressor for refrigerant compression. The refrigerant may be an external SMR or an internal LNG refrigerant working fluid expanded and compressed by a twin compander arrangement.

Methods are for storing electricity and producing liquefied natural gas (LNG) or synthetic natural (SNG) and using carbon dioxide and for producing electricity, natural gas (NG) or SNG. The methods involve, starting from a water flow, producing an oxygen gas flow and a hydrogen gas flow by electrolysis in an electrolytic cell. A first hydrogen gas flow portion and a second hydrogen gas flow portion are obtained. The first hydrogen gas flow portion is allocated to a methanation step in the presence of carbon dioxide gas. A condensed recirculation water vapor flow is obtained to be allocated to the methanation step and performing methanation. The second hydrogen gas flow portion is allocated to a cooling and liquefaction step. A liquid hydrogen flow is obtained, which is stored in a liquid hydrogen tank.

The invention relates to a method for the low-temperature separation of a gas containing CO.sub.2 in order to produce a CO.sub.2-rich fluid, in which method a gas containing CO.sub.2 and at least one component lighter than CO.sub.2 is compressed in a compressor comprising at least two stages, the gas being cooled downstream of at least one of the stages in a cooler and by exchanging heat with air and then being cooled in a first heat exchanger, the gas cooled in the first heat exchanger is separated at low temperature by partial condensation and/or distillation in order to produce a fluid rich in CO.sub.2 and depleted in the component lighter than CO.sub.2 and a gas depleted in CO.sub.2 and enriched in the component lighter than CO.sub.2. The gas depleted in CO.sub.2 is first heated in the first heat exchanger and then in the cooler before being expanded in a turbine.

The invention relates to a method for the low-temperature separation of a feed gas containing CO.sub.2, at least one component lighter than CO.sub.2 and at least one component heavier than CO.sub.2, wherein, in order to produce a CO.sub.2-rich fluid, the feed gas is compressed, the compressed gas being cooled in a first heat exchanger, the gas cooled in the first heat exchanger is separated at low temperature in a first distillation column to produce a liquid that is enriched in CO.sub.2 and depleted in the at least one component lighter than CO.sub.2 and a gas that is depleted in CO.sub.2 and enriched in the at least one component lighter than CO.sub.2, the gas depleted in CO.sub.2 is heated in the first heat exchanger, a first part of the liquid enriched in CO.sub.2 is expanded and sent to a second distillation column in liquid form, a second part of the liquid enriched in CO.sub.2 is vaporized in the first heat exchanger then sent in gas form into the tank of the second distillation column, a liquid depleted in CO.sub.2 and enriched in the at least one heavier component is withdrawn from the second column, and a gas enriched in CO.sub.2 and depleted in the at least one heavier component is withdrawn at the top of the second column as product.

A process for separating carbon dioxide from a waste gas of a fluid catalytic cracking installation including converting at least a portion of the carbon monoxide of the waste gas into carbon dioxide to form a flow enriched in carbon dioxide, separating at least a portion of the flow enriched in carbon dioxide to form a gas enriched in carbon dioxide and depleted in nitrogen and a gas rich in nitrogen and depleted in carbon dioxide, and at least a portion of the gas enriched in carbon dioxide and depleted in nitrogen is separated by way of separation at a temperature of less than 0 C. to form a fluid rich in carbon dioxide and a fluid depleted in carbon dioxide and sending a gas containing at least 90% oxygen to combustion.

A liquid air energy conversion system is provided that is a variant of conventional gas turbine combined cycle (GTCC) that integrates three subsystems or unit operations, namely a main air compression and pre-purification subsystem, a deep sub-ambient gas compression subsystem, and a power expansion and waste heat recovery subsystem. The disclosed liquid air energy conversion system enhances and optimizes the energy extraction from liquid air by avoiding main air compression directly associated with the gas turbine and the air fed to the overall system and process is limited to the air flow required to vaporize the liquid air.