Patent ID: 8438874

Claim:
Motive power supply equipment for a natural gas liquefaction plant, adapted to supply motive power to the natural gas liquefaction plant for liquefying a natural gas from which impurities have been separated in natural gas purification equipment, the motive power supply equipment comprising: gas turbine equipment including a compressor for compressing air, a combustor for generating combustion gases by burning a fuel and the compressed air from the compressor, and a turbine rotated by the combustion gases from the combustor; a passageway for carbon dioxide separate from a circulation passage for compressed air, the passageway provided on a high-temperature component part in the gas turbine equipment; and a low-temperature heat source supply system which, during rated load operation of the gas turbine equipment, supplies carbon dioxide to the passageway as a cooling medium which cools the gas turbine equipment by heat exchange with the high-temperature component part, the carbon dioxide being generated by separation from the natural gas in the natural gas purification equipment; and a low-temperature heat source recovery system which circulates the carbon dioxide that has cooled the gas turbine equipment via the passageway into the natural gas purification equipment.