A system for renewable energy storage, providing integral synthesis of heat source cryo-fuel and heat sink refrigerant for distributed electric generation and motor vehicle prime movers and refrigerant liquefiers. Fuel synthesis is by gasification and anaerobic digestion of organic feedstock with heat recovery to drive thermo-chemical reactor and air and fuel liquefiers.

A combined plant for cryogenic separation and liquefaction of methane and carbon dioxide in a biogas stream, including a mixing means, a compressor, a first exchanger, a distillation column, a second exchanger, a separating means, an expanding means, and a separator vessel. Wherein, the mixing means is configured such that the recycle gas is the overhead vapour stream, and the first exchanger and the expanding means are combined.

A system and method for recovering high-quality biomethane (RNG) from biogas sources is provided. The gas stream is compressed and liquids are separated from the gas stream at elevated pressure and reduced temperature. The compressing is performed using a plurality of compressors operating in parallel with common control set points. The system and method improve upon conventional practices and yield a biomethane product which meets strict gas pipeline quality specifications. Additionally, the system and method are an improvement to the overall methane recovery efficiency for biogas processing facilities.

Systems and methods for liquefying a gaseous fluid that comprises at least 50% by volume methane into a liquefied fluid that comprises at least 85% by volume methane. Processing can include increasing a pressure of the incoming gaseous fluid to between 10 and 50 bar; pre-treating the gaseous fluid using membrane filtering to a retentate stream having a methane content of at least 85% by volume; liquefying the retentate stream by cryogenic cooling to a temperature between 100 C. and 140 C.; flashing the liquefied fluid into a container; retrieving processed liquid fluid at a first container level at a pressure of between 1 and 10 bar, a temperature of between 120 C. and 160 C., and a methane concentration of at least 85% by volume into a storage device; and retrieving a slurry flow comprising solid CO.sub.2 and water ice at a second container level below the first container level.

Systems and methods for liquefying a gaseous fluid that comprises at least 50% by volume methane into a liquefied fluid that comprises at least 85% by volume methane. Processing can include increasing a pressure of the incoming gaseous fluid to between 10 and 50 bar; pre-treating the gaseous fluid using membrane filtering to a retentate stream having a methane content of at least 85% by volume; liquefying the retentate stream by cryogenic cooling to a temperature between 100 C. and 140 C.; flashing the liquefied fluid into a container; retrieving processed liquid fluid at a first container level at a pressure of between 1 and 10 bar, a temperature of between 120 C. and 160 C., and a methane concentration of at least 85% by volume into a storage device; and retrieving a slurry flow comprising solid CO2 and water ice at a second container level below the first container level.

The method is carried out for continuously producing a liquefied methane gas (LMG) from a pressurized mixed methane gas feed stream. It is particularly well adapted for use in relatively small LMG distributed production plant, for instance those ranging from 400 to 15,000 MT per year, and/or when the mixed methane gas feed stream has a wide range of nitrogen-content proportions, including nitrogen being substantially absent. The proposed concept can also be very useful in the design of medium-scale and/or large-size plants, including ones where the nitrogen content always remains above a certain threshold. The methods and arrangements proposed herein can mitigate losses of methane gas when venting nitrogen, for instance in the atmosphere.

A system and method for recovering high-quality biomethane (RNG) from biogas sources is provided. The gas stream is compressed and liquids are separated from the gas stream at elevated pressure and reduced temperature. The compressing is performed using a plurality of compressors operating in parallel with common control set points. The system and method improve upon conventional practices and yield a biomethane product which meets strict gas pipeline quality specifications. Additionally, the system and method are an improvement to the overall methane recovery efficiency for biogas processing facilities.

A method for producing biomethane by purifying biogas from non-hazardous waste storage facilities involves compressing the initial gas flow, introducing the gas flow to be purified into at least one adsorber loaded with adsorbents capable of reversibly adsorbing the VOCs, and subjecting the VOC-depleted gas flow to at least one membrane separation step in order to partially separate the CO.sub.2 and O.sub.2 from the gas flow. The method also involves introducing the retentate from the membrane separation step into at least one adsorber loaded with adsorbents capable of reversibly adsorbing the major portion of the remaining CO.sub.2, subjecting the CO.sub.2-depleted gas flow exiting the adsorber loaded with adsorbents capable of reversibly adsorbing the major portion of the remaining CO.sub.2 to a cryogenic separation step in a distillation column in order to separate the O.sub.2 and N.sub.2 from the gas flow, and recovering the CH.sub.4-rich flow from the cryogenic separation step.

In a process for the cryogenic separation of a methane-rich feed stream containing between 3 and 35% of oxygen and also nitrogen, the feed stream is cooled in order to produce a cooled stream, at least one portion of the cooled stream is sent to a distillation column, a bottom stream is withdrawn from the distillation column, the bottom stream being enriched in methane compared to the feed stream, a stream enriched in oxygen compared to the feed stream is withdrawn from the distillation column, and a nitrogen-rich stream is sent to the column.

The invention provides a sensing device that can be incorporated in a construction element for a toy construction set to allow new use of construction elements, for instance tracking the construction process. Sensing device comprises a carrier comprising a top surface provided with a series of top coils, a bottom surface with a series of bottom coils at a distance from said top coils, the sensing device further comprising a data processor functionally coupled with a memory for storing a status, said data processor comprises a computer program which controls and reads currents through each of said top and bottom coils and storing them in memory, thereby tracking status for each of said top and bottom coils.