Patent ID: 7833500

Claim:
A process for removing Hg 0 from coal fired flue gas comprising the steps of: a. combusting coal containing a halogen therein forming a first flue gas stream having said halogen and fly ash therein; b. maintaining said first flue gas stream at a temperature less than 400° C.; c. introducing a hydrogen halogen or an interhalogen into said first flue gas stream; d. oxidizing a substantial portion of Hg 0 in said first flue gas stream forming Hg 2+ ; e. absorbing a substantial portion of said Hg 2+ onto fly ash in said first flue gas stream; and, f. removing a substantial portion of said fly ash and said Hg 2+ adhered thereto from said first flue gas stream; wherein step c includes introducing a second flue gas stream having a halogen or an interhalogen and fly ash therein, said second flue gas stream having a higher concentration of halogen than said first flue gas stream.