Compressor system

A compressor system comprising:

• compressor trains each of which comprises:
• a multi-shaft gas turbine;
• and
• a compression unit comprising a first compressor and a second compressor both driven by the multi-shaft gas turbine, wherein the second compressor compresses a different fluid than the first compressor does;
• a first fluid supply unit that:
• comprises a fluid supply source, and
• distributes and supplies a fluid supplied from the fluid supply source to the first compressor of each of the compressor trains,
• a second fluid supply unit that:
• is independent of the first fluid supply unit, and
• distributes and supplies the different fluid under different conditions to the second compressor of each of the compressor trains, and
• a control unit configured to control operating conditions of the compressor trains, wherein
• the multi-shaft gas turbine of each of the compressor trains comprises:
• a gas turbine compressor that:
• comprises a compressor rotor, and
• compresses air with rotation of the compressor rotor;
• a combustor that produces a combustion gas by using:
• the air compressed by the gas turbine compressor, and fuel;
• a high-pressure turbine that comprises a high-pressure turbine rotor that:
• is mechanically connected to the compressor rotor, and
• is rotationally driven by the combustion gas;
• and
• a low-pressure turbine that comprises a low-pressure turbine rotor:
• disposed separately from the high-pressure turbine rotor, and
• rotationally driven by the combustion gas after the high-pressure turbine rotor is rotationally driven,
• the low-pressure turbine rotor rotates independently of the high-pressure turbine rotor,
• the compression unit of each of the compressor trains further comprises a pressure sensor that:
• acquires a pressure value of a pressure at a suction port of the second compressor, and
• sends information about the pressure value to the control unit,
• a first compression unit rotor of the first compressor is mechanically connected to the low-pressure turbine rotor,
• a second compression unit rotor of the second compressor is mechanically connected to the first compression unit rotor,
• the compressor trains are configured to operate independently or in parallel,
• the compressor trains include a first compressor train and a second compressor train,
• the control unit is configured to decrease, in response to stoppage of the second compressor train while the first compressor train continues to operate, a flow rate of the fluid supplied to the first compressor of the operating first compressor train, and:
• the control unit is configured to increase, in response to the pressure value acquired in the operating first compressor train exceeding a predetermined reference value, an amount of the fuel supplied to the combustor of the operating first compressor train to increase a rotation speed of the low-pressure turbine rotor of the operating first compressor train.