Abstract: A compressor train of chemical plants includes: a compression unit which is driven to compress a process gas of the chemical plants; a steam turbine which is rotated by steam generated in accordance with the processing of the process gas of the chemical plants to drive the compression unit; a motor which is able to assist the rotation of the steam turbine; and a frequency conversion unit which is connected to an electric power system and controls the rotation of the motor.

Abstract: A compression system includes a compressor that compresses a synthesis gas to produce a compressed gas, a first line that supplies a first gas constituting the synthesis gas to the compressor, a second line that supplies a second gas constituting the synthesis gas to the first line, a discharge line that circulates the compressed gas, a recirculation line that recirculates a part of the compressed gas from the discharge line to the first line, a first regulating valve arranged in the first line, a second regulating valve arranged in the second line, a discharge valve arranged in the discharge line, a recirculation valve arranged in the recirculation line, and a valve control device that performs switching between the first regulating valve, the second regulating valve, the discharge valve, and the recirculation valve based on an operation condition of the compressor.

Abstract: A compression system includes a compressor that compresses a synthesis gas to produce a compressed gas, a first line that supplies a first gas constituting the synthesis gas to the compressor, a second line that supplies a second gas constituting the synthesis gas to the first line, a discharge line that circulates the compressed gas, a recirculation line that recirculates a part of the compressed gas from the discharge line to the first line, a first regulating valve arranged in the first line, a second regulating valve arranged in the second line, a discharge valve arranged in the discharge line, a recirculation valve arranged in the recirculation line, and a valve control device that performs switching between the first regulating valve, the second regulating valve, the discharge valve, and the recirculation valve based on an operation condition of the compressor.

Abstract: Provided is a seal device configured to prevent leakage of a fluid on an outer circumferential surface of a rotary shaft in a direction along an axis of the rotary shaft. The seal device includes an annular main body section disposed in a circumferential direction of the rotary shaft, and a plurality of at least two kinds of holes formed in an inner circumferential surface of the main body section opening and facing to the outer circumferential surface of the rotary shaft, and having different depths.

Abstract: Provided is a seal device configured to prevent leakage of a fluid on an outer circumferential surface of a rotary shaft in a direction along an axis of the rotary shaft. The seal device includes an annular main body section disposed in a circumferential direction of the rotary shaft, and a plurality of at least two kinds of holes formed in an inner circumferential surface of the main body section opening and facing to the outer circumferential surface of the rotary shaft, and having different depths.