Gas processing apparatus

Gas treatment equipment comprising:

• a compressor which compresses process gas;
• a first process module which is disposed downstream of the compressor and which treats the process gas;
• an expander which is disposed downstream of the first process module and which expands the process gas to obtain power;
• a second process module which is disposed downstream of the expander and which treats the process gas;
• drive means which drives the compressor;
• a first pressure indicator which is disposed at an inlet of the compressor for the process gas and which measures a pressure of the process gas;
• a second pressure indicator which is disposed at an outlet of the second process module for the process gas and which measures a pressure of the process gas;
• a recirculation flow path which is connected to both of the outlet of the second process module for the process gas and the inlet of the compressor for the process gas and which recirculates the process gas;
• a first pressure control valve which is disposed in the recirculation flow path and which regulates the pressure of the process gas to be recirculated;
• a second pressure control valve which is disposed downstream of the second pressure indicator and which regulates the pressure of the process gas;
• a speed indicator which measures rotation speed of the drive means;
• and
• control means which controls at least one of the rotation speed of the drive means and the first and second pressure control valves on the basis of the pressures measured by the first and second pressure indicators and the rotation speed measured by the speed indicator.