Capturing carbon dioxide

1. A dual-cell cross flow gas contactor for capturing atmospheric CO 2 , the dual-cell cross flow gas contactor comprising:

an induced fan within a fan cowling, the induced fan coupled to a structural housing;

one or more sections of drift eliminator material comprising outer edges, the outer edges sealed to the structural housing to fill gaps between the one or more sections of drift eliminator and the structural housing;

one or more sections of packing material coupled to the structural housing and having an air travel depth between 4 meters and 9 meters defined between a packing inlet and a packing outlet, the one or more sections of packing material including a first section and a second section spaced apart from the first section, the one or more sections of packing material configured to be wetted by a process solution having a CO 2 -absorbing capacity;

an open plenum section within the structural housing and defined between the packing outlet of the one or more sections of packing material and the fan cowling;

a basin configured to collect the process solution from the one or more sections of packing material; and

piping fluidly coupling the basin to the one or more sections of packing material, the piping configured to redistribute at least a portion of the process solution collected in the basin from the one or more sections of packing material directly back to the one or more sections of packing material.

2. The dual-cell cross flow gas contactor of claim 1 , wherein the one or more sections of drift eliminator material is positioned adjacent to and downwind of the one or more sections of packing material.

3. The dual-cell cross flow gas contactor of claim 2 , wherein the one or more sections of drift eliminator material are coupled to the one or more sections of packing material.

4. The dual-cell cross flow gas contactor of claim 1 , further comprising a sealant coupled to at least one of the one or more sections of drift eliminator material or the structural housing.

5. The dual-cell cross flow gas contactor of claim 4 , wherein the sealant is inert to the process solution.

6. The dual-cell cross flow gas contactor of claim 4 , wherein the sealant comprises at least one member selected from the group consisting of: a flexible flap, a strip, a caulking, or a spray foam.

7. The dual-cell cross flow gas contactor of claim 1 , further comprising a top basin and nozzle system fluidly coupled to the piping, the top basin and nozzle system operable to distribute the process solution to the one or more sections of packing material.

8. The dual-cell cross flow gas contactor of claim 1 , wherein the one or more sections of packing material are configured to be wetted by the process solution that comprises potassium hydroxide or sodium hydroxide.

9. The dual-cell cross flow gas contactor of claim 1 , wherein the basin is fluidly coupled to a solids collection basin comprising a mechanical removal system, the solids collection basin fluidly coupled to one or more solid collection zones.

10. The dual-cell cross flow gas contactor of claim 9 , wherein the mechanical removal system comprises at least one member selected from the group consisting of: an auger, a screw conveyor, a progressive cavity pump, a screw pump, a reciprocating pump, a high density solids pump, a sludge raking system, or a sludge suction system.

11. The dual-cell cross flow gas contactor of claim 9 , further comprising a solids transfer system fluidly coupled to the basin, the solids transfer system configured to remove solid material from the one or more solid collection zones.

12. The dual-cell cross flow gas contactor of claim 1 , further comprising a pump configured to flow at least some of the process solution from the basin through the piping to the one or more sections of packing material.

13. The dual-cell cross flow gas contactor of claim 1 , wherein the basin comprises a basin floor, at least some of the basin floor inclined in a downward direction, the process solution configured to disperse solid particulates of absorbed CO 2 from the one or more sections of packing material and into the basin to form settled solid particulates of absorbed CO 2 on the basin floor, the process solution configured to drop onto the basin floor and displace the settled solid particulates of absorbed CO 2 along the basin floor in the downward direction.

14. The dual-cell cross flow gas contactor of claim 1 , wherein the induced fan is vertically positioned within the fan cowling between a fan cowling inlet and a fan cowling outlet.

15. The dual-cell cross flow gas contactor of claim 1 , wherein the one or more sections of drift eliminator material is positioned lower than, and upstream of, the induced fan, and downwind of the one or more sections of packing material, relative to a direction of flow of the atmospheric CO 2 .

16. The dual-cell cross flow gas contactor of claim 1 , wherein:

the induced fan defines an upright fan axis; and

the one or more sections of drift eliminator material has a vertical orientation and is spaced apart horizontally from the upright fan axis.

17. The dual-cell cross flow gas contactor of claim 1 , wherein the basin comprises a basin floor and a sump defining a sump volume, the sump volume disposed lower than the basin floor, the basin floor surrounding the sump volume.

18. A dual-cell cross flow gas contactor for capturing atmospheric CO 2 , the dual-cell cross flow gas contactor comprising:

a structural housing;

a fan cowling extending upwardly from a fan cowling inlet adjacent the structural housing to a fan cowling outlet;

at least one induced fan vertically positioned within the fan cowling between the fan cowling inlet and the fan cowling outlet and coupled to the structural housing;

a first cell and a second cell, each of the first cell and the second cell comprising:

an air inlet; and

a packing material positioned within the structural housing lower than the at least one induced fan, the packing material having an air travel depth between 4 meters and 9 meters defined between a packing inlet and a packing outlet, the packing material configured to be wetted by a process solution having a CO 2 -absorbing capacity;

a plenum between the first cell and the second cell, the plenum defined between the packing outlet of each of the first cell and the second cell and between the fan cowling, the at least one induced fan configured to rotate about an upright fan axis to create an air flow through the air inlet of the first cell and the air inlet of the second cell, through the packing material of the first cell and the packing material of the second cell, through the plenum, and through the fan cowling outlet;

at least one drift eliminator positioned within the structural housing lower than the at least one induced fan, the at least one drift eliminator positioned downwind of the packing material of the first cell and of the second cell and upwind of the at least one induced fan relative to a direction of the air flow, the at least one drift eliminator comprising outer edges sealed to the structural housing to fill gaps between the at least one drift eliminator and the structural housing;

at least one basin being positioned below the packing material of the first cell and the packing material of the second cell to collect the process solution from the packing material of the first cell and the packing material of the second cell;

one or more flow pipes fluidly coupling the at least one basin to the packing material of the first cell and the packing material of the second cell; and

a pump fluidly coupled to the at least one basin and configured to redistribute at least a portion of the process solution collected in the basin from the packing material of the first cell and the packing material of the second cell directly back to the packing material of the first cell and the packing material of the second cell.

19. The dual-cell cross flow gas contactor of claim 18 , wherein the at least one basin comprises a first top basin and a second top basin, the first top basin positioned above the packing material of the first cell and lower than the at least one induced fan, the second top basin positioned above the packing material of the second cell and lower than the at least one induced fan, the first and second top basins fluidly coupled to the one or more flow pipes and comprising a plurality of nozzles disposed above the packing material of the first cell and the packing material of the second cell and configured to distribute the process solution to the packing material of the first cell and the packing material of the second cell.

20. The dual-cell cross flow gas contactor of claim 18 , wherein the at least one drift eliminator is spaced apart horizontally from the upright fan axis of the at least one induced fan and has a vertical orientation.

21. The dual-cell cross flow gas contactor of claim 18 , wherein the at least one basin comprises a sump, and the pump is fluidly coupled to the sump and is configured to redistribute at least a portion of the process solution collected in the sump to the packing material of the first cell and the packing material of the second cell.

22. The dual-cell cross flow gas contactor of claim 18 , further comprising an outlet surface area disposed downwind of the packing material of at least one of the first cell and of the second cell relative to the direction of the air flow, and upwind of the at least one induced fan relative to the direction of the air flow, the outlet surface area defined in a plane normal to the direction of the air flow, the at least one drift eliminator with the outer edges sealed to the structural housing blocking at least 99% of the outlet surface area.

23. The dual-cell cross flow gas contactor of claim 18 , wherein the dual-cell cross flow gas contactor is configured to cool streams comprising water.