Phillip C Rader

US Patent:

6531104, Mar 11, 2003

Filed:

Nov 21, 2000

Appl. No.:

09/717724

Inventors:

Donald C. Borio - Knoxville TN
David J. Muraskin - Knoxville TN
Phillip C. Rader - Knoxville TN
Mark A. Walters - Knoxville TN

Assignee:

Alstom (Schweiz) AG - Baden

International Classification:

B01D 5350

US Classification:

42324301, 423237, 42324303, 42324306

Abstract:

A flue gas mixture containing sulfur oxides is scrubbed in a countercurrent spray tower absorber with a spray of ammonium sulfate liquor and the scrubbed gas stream containing ammonia aerosols, sulfur trioxide aerosols and ammonia slip is passed to a wet electrostatic precipitator for the removal of the aerosols and slip. The ammonium sulfate liquor in the absorber system is passed into a separate reaction tank where ammonia and air are injected. The ammonia and sulfur oxides react in the separate reaction tank to form ammonium sulfite which is oxidized to the sulfate by the air. The gases and vapors from the separate reaction tank are separately scrubbed and the gases then returned to the absorber.