Processes, apparatuses, and systems for direct air carbon capture utilizing waste heat and exhaust air

Abstract

Disclosed are processes, apparatuses, and systems for Direct Air Carbon Capture (DACC). An example process involves using a stream of exhaust air flowing from an air cooled heat exchanger to drive a DACC unit. Another example process involves conveying waste heat recovered from an industrial source to the DACC unit. The waste heat may be used to remove captured CO2 from a capture device of the DACC unit and/or for regeneration of the capture device.

What is claimed is: 
     
         1 . A process comprising:
 directing, into a direct air carbon capture (DACC) unit, a stream of exhaust air from an air cooled heat exchanger, wherein the DACC unit includes a capture device configured to capture carbon dioxide (CO2) from the exhaust air flowing through the DACC unit, wherein the capture device includes a solvent configured to selectively filter at least a portion of the CO2 from the exhaust air.   
     
     
         2 . The process of  claim 1 , wherein the capture device includes one or more chemicals configured to selectively separate at least a portion of the CO2 from the exhaust air. 
     
     
         3 . The process of  claim 2 , wherein the one or more chemicals include at least one of a liquid solvent. 
     
     
         4 . The process of  claim 1 , further comprising:
 conveying waste heat to the DACC unit; and   removing, using the waste heat, the CO2 captured by the capture device.   
     
     
         5 . The process of  claim 4 , wherein removing the CO2 captured by the capture device comprises regenerating the capture device. 
     
     
         6 . The process of  claim 4 , further comprising recovering the waste heat from an industrial flue gas. 
     
     
         7 . The process of  claim 1 , further comprising:
 removing water from the stream of exhaust air flowing through the DACC unit to produce liquid water.   
     
     
         8 . A process comprising:
 directing, into a direct air carbon capture (DACC) unit, a stream of exhaust air from an air cooled heat exchanger, wherein the DACC unit includes a capture device configured to capture carbon dioxide (CO2) from the exhaust air flowing through the DACC unit, wherein the capture device includes a solid sorbent configured to selectively filter at least a portion of the CO2 from the exhaust air.   
     
     
         9 . The process of  claim 8 , further comprising:
 conveying waste heat to the DACC unit; and   removing, using the waste heat, the CO2 captured by the capture device.   
     
     
         10 . The process of  claim 9 , wherein removing the CO2 captured by the capture device comprises regenerating the capture device. 
     
     
         11 . The process of  claim 8 , further comprising recovering the waste heat from an industrial flue gas. 
     
     
         12 . The process of  claim 8 , further comprising:
 removing water from the stream of exhaust air flowing through the DACC unit to produce liquid water.