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A cryogenic refrigerator for cooling a rotating device includes a stationary regenerator, and a rotatable cold heat exchanger coupled to the stationary regenerator to rotate relative thereto. The cryogenic refrigerator is, for example, of the Gifford-McMahon type or pulse tube type. In the Gifford-M

A cryogenic refrigerator for cooling a rotating device includes a stationary regenerator, and a rotatable cold heat exchanger coupled to the stationary regenerator to rotate relative thereto. The cryogenic refrigerator is, for example, of the Gifford-McMahon type or pulse tube type. In the Gifford-McMahon type, a stationary cylinder houses the regenerator, and a rotatable cylinder mounted to the cold heat exchanger is concentrically arranged about the stationary cylinder. Alternatively, the rotatable cylinder is axially offset of the stationary cylinder. A seal, for example, a ferrofluidic seal, is located between the stationary and rotatable cylinders. In the pulse-tube type, a pulse tube is concentrically arranged about the regenerator, and the cold heat exchanger includes a stationary portion coupled to the regenerator and a rotatable portion coupled to the pulse tube. A back-up valve system is provided for increased reliability.

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A cryogenic refrigerator for cooling a rotating device includes a stationary regenerator, and a rotatable cold heat exchanger coupled to the stationary regenerator to rotate relative thereto. The cryogenic refrigerator is, for example, of the Gifford-McMahon type or pulse tube type. In the Gifford-M

A cryogenic refrigerator for cooling a rotating device includes a stationary regenerator, and a rotatable cold heat exchanger coupled to the stationary regenerator to rotate relative thereto. The cryogenic refrigerator is, for example, of the Gifford-McMahon type or pulse tube type. In the Gifford-McMahon type, a stationary cylinder houses the regenerator, and a rotatable cylinder mounted to the cold heat exchanger is concentrically arranged about the stationary cylinder. Alternatively, the rotatable cylinder is axially offset of the stationary cylinder. A seal, for example, a ferrofluidic seal, is located between the stationary and rotatable cylinders. In the pulse-tube type, a pulse tube is concentrically arranged about the regenerator, and the cold heat exchanger includes a stationary portion coupled to the regenerator and a rotatable portion coupled to the pulse tube. A back-up valve system is provided for increased reliability. compressor's discharge gas heat contained within said primary recycle gas flow is transferred to air or to a facility's provided streams of process gas or steam, said compressor primary recycle gas flow being proportioned as required between plural exchangers by individual control valve means positioned within each said heat exchanger's parallel outlet branch's manifold conduit means; (f) a turbine exhaust gas waste heat recovery unit (WHRU) heat exchanger means conduit-positioned downstream of a power turbine for transfer of power turbine exhaust gas residual heat energy to fluid coils contained within two or three parallel sections comprising said WHRU heat exchanger; (g) a said WHRU heat exchanger collectively comprising a primary section containing parallel primary recycle gas stream coils as well as secondary and/or auxiliary sections containing steam or process fluid coils; (h) conduit end-manifold parallel branches positioned downstream of said compressed recycle gas heat exchangers and containing individual control damper valve means for distributing the primary recycle manifold gas stream between parallel first and second primary recycle stream coils within the primary section of said WHRU heat exchanger, said parallel primary recycle gas stream coils discharging highly superheated first and second working motive fluid streams; (i) conduit manifold branches and control damper valve means for distributing the power turbine exhaust gas mass flows between the said parallel sections of the said turbine exhaust gas WHRU heat exchanger, said manifold branch and damper control valve means connected to the downstream cool exhaust plenum sections side of said WHRU heat exchanger; (j) manifold means for distributing said first flow-controlled stream portion of working motive fluid to one or more premixer subassemblies to establish a maximum temperature of primary and secondary zone combustion chemical reactions, said premixer subassemblies being direct means-connected to the exterior or interior of one or more combustion chamber assemblies, said manifold means positioned downstream of the fluid stream's said WHRU heat exchanger having a primary first stream discharge header; (k) manifold means for distributing said second flow controlled stream portion of the said working motive fluid to one or more said combustor assemblies for establishing a reduced controlled temperature tertiary zone at outlets of the said combustor assemblies, said manifold means positioned downstream of the fluid stream's said WHRU heat exchanger having a primary section second stream discharge header; (l) conduit and control valve means for distributing a predominant oxygen stream to one or more said premixer subassemblies; said conduit and valve means positioned upstream of said premixer subassemblies; (m) conduit and control valve means for distributing pressurized gaseous or liquid hydrocarbon fuel to one or more said premixer subassemblies; (n) one or more said combustor assemblies downstream from the said WHRU heat exchanger's primary section, said combustor assemblies comprising regions wherein the ignition and combustion chemical reactions occur, producing water vapor, carbon dioxide, and heat of combustion absorption by said working motive fluid; (o) a power turbine assembly downstream of the said combustor assemblies for receiving the combustor gases predominantly comprising the working motive fluid and products of combustion at elevated temperature and pressure, the said combustor gases being expanded within said power turbine to produce mechanical output power and residual superheated exhaust gas heat energy; (p) a power turbine assembly with output shaft series-train means of transmitting horsepower to drive rotating mechanical equipment or electrical generators with electric power conduit connections to a facility's control room containing generator switchgear and MCC modular cabinets; (q) manifold or conduit series positioned m