A system includes a multi-tube fuel nozzle. The multi-tube fuel nozzle includes multiple mixing tubes. Each mixing tube includes an annular wall disposed about a central passage and an air inlet region configured to be disposed about a fuel injector extending into the central passage. The central passage extends from an upstream end to a downstream end of the annular wall relative to a direction of flow through the central passage. The air inlet region includes an air entry surface of the annular wall that gradually decreases in diameter in the direction of flow.

A heat exchange system includes a tubular fan air inlet portion and a tubular cooled air outlet portion connected to a first end of a tubular mid portion. The heat exchange system further includes a tubular hot air inlet portion and a tubular recycled fan air outlet portion connected a second end of the mid portion. Still further, the heat exchange system includes an integrally-formed, compliant heat exchanger tube extending between the hot air inlet portion and the cooled air outlet portion within the mid portion to define a heat exchanger first flow passage within the heat exchanger tube and a second flow passage outside of the heat exchanger tube but within the tubular mid portion. Methods for fabricating such heat exchange systems are also provided.

The present disclosure provides systems and methods for power production. In particular, the systems and methods utilize the addition of heat to an expanded turbine exhaust stream in order to increase the available quantity of heat for recuperation and use therein for heating a compressed carbon dioxide stream for recycle back to a combustor of the power production system and method.

A multi-source aircraft propulsion arrangement comprises a cryogenic propulsion source and a combustion propulsion source wherein the cryogenic propulsion source and the combustion propulsion source may be selectively and independently operated to generate propulsive force for an aircraft.

A catalytic converter module assembly comprises a plurality of catalytic converter modules arranged in series such that gas may be fed through successive catalytic converter modules. Each catalytic converter module comprises a catalytic converter having one or more catalytic converter members arranged and configured for fluid contact with a gas, and a heat generator arranged close to and upstream of the catalytic converter. The heat generator and the catalytic converter are arranged in fluid communication and interconnected by connection means so as to form a unitary device. The invention allows for heating a gas flowing past the heat generator substantially immediately before the gas is exposed to the catalytic converter or catalytic converter member, whereby the efficiency of a catalytic converter is enhanced. The invention is particularly useful for cleaning non-combusted hydrocarbons, such as methane, carbon monoxide, or nitrogen oxides, in the exhaust gas.

A catalytic converter module assembly comprises a plurality of catalytic converter modules arranged in series such that gas may be fed through successive catalytic converter modules. Each catalytic converter module comprises a catalytic converter having one or more catalytic converter members arranged and configured for fluid contact with a gas, and a heat generator arranged close to and upstream of the catalytic converter. The heat generator and the catalytic converter are arranged in fluid communication and interconnected by connection means so as to form a unitary device. The invention allows for heating a gas flowing past the heat generator substantially immediately before the gas is exposed to the catalytic converter or catalytic converter member, whereby the efficiency of a catalytic converter is enhanced. The invention is particularly useful for cleaning non-combusted hydrocarbons, such as methane, carbon monoxide, or nitrogen oxides, in the exhaust gas.

The hybrid desalination and energy production system includes a desalination system for separating seawater into purified water and brine, an electrodialysis system for treating the brine and outputting low salinity water, a hypersaline brine solution, and H.sub.2 gas; an evaporator for treating the hypersaline brine solution and outputting salt and water vapor; a superheater for treating the water vapor and outputting a superheated water vapor; a turbine for receiving the superheated water vapor to generate energy; a gas scrubber for receiving the H.sub.2 gas from the electrodialysis system and producing dry hydrogen; and a hydrogen cell for receiving the dry hydrogen and outputting energy. A condenser converts the vapor into condensate and low salinity water. A desalinated water collection tank receives the desalinated or low salinity water. A pressure retarded osmosis system receives the brine, the low salinity water, and condensate from the condenser to produce dilute brine.

The present disclosure relates to a novel gas turbine system having applications, for example, in thermal power generation in an environmentally friendly manner. The multiloop gas turbine system may have multiple functional units each comprising a compressor, a regenerator, a combustion unit, and a turbine. Typically, exhaust flow of a turbine of a preceding loop may be routed to the combustion unit of the next loop, allowing mixing of exhaust flow with hot compressed air of the next loop, and the expanded exhaust from the turbine of the ultimate loop is fed back into the regenerators of each loop to recover exhaust heat.

A system including: (i) a pumped-heat energy storage system (“PHES system”), wherein the PHES system is operable in a charge mode to convert electricity into stored thermal energy in a hot thermal storage (“HTS”) medium; (ii) an electric heater in thermal contact with the hot HTS medium, wherein the electric heater is operable to heat the hot HTS medium above a temperature achievable by transferring heat from a working fluid to a warm HTS medium in a thermodynamic cycle.

The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO.sub.2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO.sub.2 circulating fluid. Fuel derived CO.sub.2 can be captured and delivered at pipeline pressure. Other impurities can be captured.