Patent ID: 6569388
Filing Date: 2003-05-27
Classification: B01D,Y02A

Abstract:
A system for removing SOx and trace metals from a gaseous waste stream from coal combustion, said coal combustion generating an untreated gaseous waste stream containing SOx and trace metals, and the treatment of said gaseous waste stream generating a source of limestone, lime or slaked lime and a flow of clean flue gas containing carbon dioxide, said system comprising:a source of an untreated gaseous waste stream containing SOx and trace metals; a sorbent reaction container for receiving said untreated gaseous waste stream and a feed of carbonated sorbent, wherein said sorbent reaction container mixes said untreated gaseous waste stream with said carbonated sorbent such that said carbonated sorbent removes said SOx and trace metals from said untreated gaseous waste stream thereby forming a reacted sorbent and a treated gas stream; an apparatus in fluid communication with said sorbent reaction container for separating said reacted sorbent from said treated gas stream, wherein said reacted sorbent comprises limestone, lime or slaked lime; a carbonation reaction container for receiving said reacted sorbent from said apparatus and a flow of water said carbonation reaction container for receiving a flow of a clean flue gas and admixing said flue gas containing carbon dioxide with said reacted sorbent and said water so as to carbonate said limestone, lime or slaked lime, so as to reactivate said reacted sorbent, thereby producing said carbonated sorbent; a catalytic reaction container for contacting said treated gas stream with a catalyst adapted to remove NOx species following treatment in said sorbent reaction container, thereby forming said flow of clean flue gas; a conduit adapted to conduct said flow of clean flue gas from said catalytic reaction container to said carbonation reaction container; and a dryer for receiving said carbonated sorbent, said dryer adapted to remove water from said carbonated sorbent.