Carbon dioxide capture/regeneration method using co-generation

• US 8,500,861 B2
• Filed: 03/20/2012
• Issued: 08/06/2013
• Est. Priority Date: 05/21/2007
• Status: Active Grant

• Current Assignee: Global Thermostat Operations LLC
• Original Assignee: Graciela Chichilnisky
• Inventors: Eisenberger, Peter
• Primary Examiner(s): Jones, Christopher P
• Application Number:
  US13/425,236
• Publication Number:
  US 20120174780A1
• Time in Patent Office: 504 Days
• Field of Search: 951/07, 951/39, 961/26, 961/46
• US Class Current: 95/139
• CPC Class Codes: B01D 2253/25 Coated, impregnated or composite adsorbents
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2258/06 Polluted air
• CPC Class Codes: B01D 2259/40098 with other heating means
• CPC Class Codes: B01D 53/0407 Constructional details of adsorbing systems
• CPC Class Codes: B01D 53/0462 Temperature swing adsorption
• CPC Class Codes: B01D 53/06 with moving adsorbents, e.g. rotating beds B01D53/025 takes precedence
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

New and useful system and method concepts are provided, for removing carbon dioxide from a flow of carbon dioxide laden air. More specifically, a sorbent structure is used in new and useful structures and techniques to bind carbon dioxide in a carbon dioxide laden air stream, and process heat is used to separate carbon dioxide from the sorbent structure and regenerate the sorbent structure.

Claims

1. A method of removing carbon dioxide from a carbon dioxide-laden gas mixture of both predominantly ambient air and a relatively small amount (by volume) of effluent flue gas from a facility operating a primary process, comprising:

directing a flow of carbon dioxide-laden effluent flue gas from a facility operating a primary process into contact with ambient air to form a carbon dioxide-laden gas mixture of predominantly ambient air, directing a flow of said carbon dioxide-laden gas mixture of predominantly ambient air through a monolithic carbon dioxide capture structure disposed at a first relatively higher elevation that is supporting an amine sorbent capable of binding carbon dioxide to the sorbent, so as to remove carbon dioxide from the mixture, moving said monolithic carbon dioxide capture structure from contact with said flow of carbon dioxide-laden gas mixture of predominantly ambient air into a regeneration enclosure disposed at a second relatively lower elevation, regenerating the sorbent by causing saturated steam carrying process heat from said primary process at a temperature of not greater than about 120.degree. C. to come into contact with the carbon dioxide capture structure in the regeneration enclosure at said relatively lower elevation, thereby causing separation of carbon dioxide from the sorbent into the regeneration enclosure, withdrawing separated carbon dioxide from the regeneration enclosure, selectively moving the carbon dioxide capture structure out of the regeneration enclosure from said second relatively lower elevation back to a position at said first relatively higher elevation disposed in the flow path of carbon dioxide-laden gas mixture, thereby permitting the regenerated sorbent to bind additional carbon dioxide from the flow of said carbon dioxide-laden gas mixture, cyclically repeating said movements between said first and second elevations of the monolithic carbon dioxide capture structure between the regeneration enclosure and into contact with the carbon dioxide-laden gas mixture of predominantly ambient air, and directing said withdrawn separated carbon dioxide to a storage structure, wherein said process heat from said primary process during said step of regenerating the sorbent is provided by a co-generation process wherein process heat steam is directed at the carbon dioxide-capture structure in the regeneration enclosure.