To reduce cost of production synthetic for simultaneously producing, from the same natural gas source, both liquefied natural gas and conversion product of the natural gas such as methanol, dimethyl ether or fischer-tropsch product.
In a system having a gas turbine including a compressor 1, a combustor 5, and an expander 17, the expander is connected to the compressor, a natural gas converting unit 23, and an air separating unit 20, air is compressed in the compressor, first part 3 of the air is fed to the combustor, and second part 7 of the air is fed to the air separating unit. Oxygen rich gas 21 is fed from the air separating unit to the natural gas converting unit, compressed nitrogen rich gas 16 is fed to the upstream of the expander. First natural gas flow 33 is fed to the natural gas converting unit, second natural gas flow 35 is fed to a natural gas liquefying unit, and air used for operating cycle compressors 22, 27 and 41 of a cooling cycle of the natural gas liquefying unit is separated by work generated by the expander.
Satoshi Kono
Makoto Nakamura
Sadao Muramatsu
Ryo Hashimoto