System and method for process gas recapture for emission recovery

A system for recovering a process gas from a first volume at a first pressure to a second volume at a second pressure, the system comprising:

• one or more regulation stages receiving the process gas from the first volume at the first pressure and configured to step down the first pressure to an intermediate pressure, each of the one or more regulation stages comprising a pressure control valve to step-down pressure of the process gas and comprising a heat exchanger to heat the process gas thereafter;
• a gas scrubbing stage receiving the process gas from the one or more regulation stages and collecting liquid from the process gas;
• one or more compression stages receiving the process gas from the gas scrubbing stage and configured to step up the intermediate pressure to a final pressure, each of the one or more compression stages comprising a compression cycle to step-up pressure and comprises a heat exchanger to cool the process gas thereafter;
• and
• a discharge stage receiving the process gas from the one or more compression stages and configured to discharge the process gas at the final pressure to the second volume at the second pressure, the final pressure being equal to or greater than the second pressure,
• wherein the system comprises an intermediate pressure control valve connected between the gas scrubbing stage and the one or more compression stages or connected between the one or more regulation stages and the gas scrubbing stage, the intermediate pressure control valve being configured to step-down the intermediate pressure to a lower pressure.

A method to recover a process gas from a first volume at a first pressure to a second volume at a second pressure, the method comprising:

• receiving the process gas from the first volume at the first pressure;
• bringing the process gas down from the first pressure to an intermediate stage pressure below the first pressure by stepping the process gas down from the first pressure through one or more pressure control valves and reheating the process gas after being stepped down;
• scrubbing liquid from the stepped-down process gas;
• bringing the processes gas up from the intermediate staged pressure to a final staged pressure by stepping the process gas up through one or more compression cycles and cooling the process gas after being compressed;
• and
• discharging the process gas at the final staged pressure to the second volume, the final staged pressure being equal to or greater than the second pressure,
• wherein bringing the processes gas down from the first pressure to the intermediate staged pressure below the first pressure comprises measuring a first temperature of the process gas after being stepped down, reheating the process gas with a heat exchanger based on the first temperature;
• measuring a second temperature of the process gas after reheating;
• and verifying the reheating of the process gas based on a comparison between the first and second temperatures.

A method to recover a process gas from a first volume at a first pressure to a second volume at a second pressure, the method comprising:

• receiving the process gas from the first volume at the first pressure;
• bringing the process gas down from the first pressure to an intermediate stage pressure below the first pressure by stepping the process gas down from the first pressure through one or more pressure control valves and reheating the process gas after being stepped down;
• scrubbing liquid from the stepped-down process gas;
• bringing the processes gas up from the intermediate staged pressure to a final staged pressure by stepping the process gas up through one or more compression cycles and cooling the process gas after being compressed;
• and
• discharging the process gas at the final staged pressure to the second volume, the final staged pressure being equal to or greater than the second pressure,
• wherein bringing the processes gas down from the first pressure to the intermediate staged pressure below the first pressure comprises measuring a first pressure of the process gas before being stepped down;
• measuring a second pressure of the process gas after being stepped down;
• and verifying the stepdown of the process gas based a comparison between the first and second pressures.

A system for recovering a process gas from a first volume at a first pressure to a second volume at a second pressure, the system comprising:

• one or more regulation stages receiving the process gas from the first volume at the first pressure and configured to step down the first pressure to an intermediate pressure, each of the one or more regulation stages comprising a pressure control valve to step-down pressure of the process gas and comprising a heat exchanger to heat the process gas thereafter;
• a gas scrubbing stage receiving the process gas from the one or more regulation stages and collecting liquid from the process gas;
• one or more compression stages receiving the process gas from the gas scrubbing stage and configured to step up the intermediate pressure to a final pressure, each of the one or more compression stages comprising a compression cycle to step-up pressure;
• and
• a discharge stage receiving the process gas from the one or more compression stages and configured to discharge the process gas at the final pressure to the second volume at the second pressure, the final pressure being equal to or greater than the second pressure,
• wherein the system comprises an intermediate pressure control valve connected between the gas scrubbing stage and the one or more compression stages or connected between the one or more regulation stages and the gas scrubbing stage, the intermediate pressure control valve being configured to step-down the intermediate pressure to a lower pressure.