Dual stripper with water sweep gas
An environmental control system includes an air conditioning subsystem and a contaminant removal subsystem downstream of the environment to be conditioned. The contaminant removal subsystem includes a first gas-liquid contactor-separator, a second gas-liquid contactor-separator, and a third gas-liquid contactor-separator. One of the first, the second, and the third gas-liquid contactor-separators is configured to receive used absorbent liquid having at least a first contaminant and discharge at least a first contaminant for recovery and reuse. Another of the first, the second and the third gas-liquid contactor-separators is configured to receive used absorbent liquid having at least a second contaminant and discharge at least the second contaminant for recovery and reuse.
1. An environmental control system, comprising:
an air conditioning subsystem;
a contaminant removal subsystem downstream of the environment to be conditioned; and
a mix manifold intermediate the air conditioning subsystem and the contaminant removal subsystem,
wherein the contaminant removal subsystem includes:
a first gas-liquid contactor-separator;
a second gas-liquid contactor-separator;
a third gas-liquid contactor-separator; and
wherein one of the first, the second, and the third gas-liquid contactor-separators is configured to:
receive used absorbent liquid having at least a first contaminant;
discharge at least a first contaminant for recovery and reuse;
wherein another of the first, the second and the third gas-liquid contactor-separators is configured to:
receive used absorbent liquid having at least a second contaminant;
discharge at least a second contaminant for recovery and reuse.
2. The contaminant removal subsystem of claim 1 , further comprising a water vaporizer downstream of the second gas-liquid contactor separator.
3. The contaminant removal subsystem of claim 1 , further comprising a water vaporizer downstream of the third gas-liquid contactor-separator.
4. The contaminant removal subsystem of claim 1 , further comprising a dehumidifier downstream of the second gas-liquid contactor-separator.
5. The contaminant removal subsystem of claim 1 , wherein the first, the second, and the third gas-liquid contactor-separators comprise a hollow fiber membrane bundle.
6. A contaminant removal subsystem, comprising:
a first gas-liquid contactor-separator;
a second gas-liquid contactor-separator downstream of the first gas-liquid contactor-separator; and
a third gas-liquid contactor-separator downstream of the second gas-liquid contactor-separator;
wherein the first gas-liquid contactor-separator is configured to:
receive a clean absorbent liquid; and
discharge a used absorbent liquid;
wherein the second gas-liquid contactor-separator is configured to:
receive the used absorbent liquid discharged from the first gas-liquid contactor-separator;
discharge a first contaminant, from the used liquid absorbent, for recovery and reuse; and
discharge partially regenerated absorbent liquid;
wherein the third gas-liquid contactor-separator is configured to:
receive the partially regenerated absorbent liquid discharged from the second gas-liquid contactor-separator;
receive a sweep gas; and
discharge a second contaminant, from the partially regenerated liquid absorbent, for recovery and reuse.
7. The subsystem of claim 6 , further comprising a water vaporizer downstream of the second gas-liquid contactor-separator.
8. The subsystem of claim 6 , further comprising a water vaporizer downstream of the third gas-liquid contactor-separator.
9. The subsystem of claim 6 , further comprising a dehumidifier downstream of the second gas-liquid contactor-separator.
10. The subsystem of claim 6 , wherein the first contaminant comprises carbon dioxide.
11. The subsystem of claim 6 , wherein the second contaminant comprises water.
12. The subsystem of claim 6 , wherein the second gas-liquid contactor-separator discharges the first and the second contaminants.
13. A contaminant removal subsystem, comprising:
a scrubber;
a first stripper downstream of the scrubber;
a second stripper downstream of the first stripper; and
a water vaporizer downstream of the first stripper;
wherein the first stripper is configured to discharge a first contaminant for recovery and reuse;
wherein the second stripper is configured to discharge a second contaminant for recovery and reuse;
wherein the water vaporizer is configured to provide a sweep gas to the first stripper; and
wherein the scrubber is configured to discharge a sweep gas to the second stripper.
14. The subsystem of claim 13 , further comprising a dehumidifier downstream of the first stripper and configured to discharge the first contaminant for recovery and reuse.
15. The subsystem of claim 13 , wherein the scrubber is configured to receive a clean liquid absorbent and discharge a used liquid absorbent to the first stripper.
16. The subsystem of claim 13 , wherein the first contaminant comprises carbon dioxide.
17. The subsystem of claim 13 , wherein the second contaminant comprises water.