System and method for carbon dioxide capture and sequestration
A method and a system capable of removing carbon dioxide directly from ambient air, and obtaining relatively pure CO 2 . The method comprises the steps of generating usable and process heat from a primary production process; applying the process heat from said primary process to co-generate substantially saturated steam, alternately repeatedly exposing a sorbent to removal and to capture regeneration system phases, wherein said sorbent is alternately exposed to a flow of ambient air during said removal phase, to sorb, and therefore remove, carbon dioxide from said ambient air, and to a flow of the process steam during the regeneration and capture phase, to remove the sorbed carbon dioxide, thus regenerating such sorbent, and capturing in relatively pure form the removed carbon dioxide. The sorbent can be carried on a porous thin flexible sheet constantly in motion between the removal location and the regeneration location.
1. A system for removing carbon dioxide from carbon dioxide laden air, the system comprising:
a carbon dioxide capture structure comprising a contactor with a surface area along which an amine sorbent is distributed that is capable of reversibly adsorbing, or binding, to carbon dioxide, an air conduit, open at one end to the atmosphere and at a second end to the capture structure, for bringing a flow of carbon dioxide-laden ambient air to and through the carbon dioxide capture structure at a first location, a sealable regeneration chamber capable of containing the capture structure at a second location;
carriage means for moving the capture structure between the first and the second locations; a source of process heat steam for providing steam at a temperature of not greater than 120° C.;
a hot fluid conduit connected to the source of process heat steam and to the sealable regeneration chamber for directing such process heat steam at the carbon dioxide-loaded sorbent on the capture structure in the regeneration chamber to strip carbon dioxide from the sorbent; and
a fluid conduit for carrying the separated carbon dioxide away from the regeneration chamber, wherein said contactor comprises a relatively thin substantially flexible sheet material whose surface is covered with said sorbent, and wherein said carriage means is a series of rollers around which said flexible sheet or fabric material is supported which enable substantially continuous movement thereof between adsorption and regeneration stages, and a pair of sealing surfaces between which the flexible sheet must pass located between the location where the flexible sheet is exposed to the atmosphere and the interior of the regeneration chamber, thereby facilitating a continuous moving process.