Compressor train for chemical plant

A compressor train for a chemical plant, comprising:

• a compression unit comprising a rotation shaft rotatable about an axis as a center and configured to compress a process gas of the chemical plant;
• a motor comprising an output shaft rotatable about the axis as a center and configured to drive the compression unit and to adjust a rotation speed of the compression unit;
• a steam turbine comprising a turbine rotation shaft rotatable about the axis as a center, rotated by steam generated in association with treatment of the process gas of the chemical plant at a rotation speed equal to or lower than a rotation speed of the motor, and configured to assist rotation of the motor;
• a steam introduction line through which the steam flows toward the steam turbine;
• and
• a main trip and throttle valve disposed on the steam introduction line and configured to block or cause the steam to flow into the steam turbine, wherein
• the steam turbine is disposed between the motor and the compression unit in an axial direction in which the axis extends, and
• the rotation shaft, the turbine rotation shaft, and the output shaft are disposed on a same straight line such that the axis is shared as a center line of the rotation shaft, a center line of the turbine rotation shaft, and a center line of the output shaft.