Mark S Richman

US Patent:

43223923, Mar 30, 1982

Filed:

Aug 11, 1980

Appl. No.:

6/176796

Inventors:

Robert J. Gleason - Edison NJ
Mark Richman - South Bound Brook NJ
Paul E. Cooke - Titusville NJ

Assignee:

Research-Cottrell, Inc. - Somerville NJ

International Classification:

C01B 1700

US Classification:

423242

Abstract:

Sulfur dioxide is scrubbed from boiler flue gases in a double-loop alkali scrubber, one a quencher loop and the other an absorption loop. The reagent flow of the two loops is isolated so that none of the reagent from the quencher loop is cycled to the absorber loop and a portion of the make-up water for the quencher loop is received from the absorber loop. By controlling recycled water from a dewatering system and selective utilization of high and low solids streams from the absorber system, the quencher slurry concentration may be controlled and the requirement for new make-up water reduced. The two loop process isolates the main absorber system including the demisters, which are prone to scaling and corrosion, from the evaporative quencher portion of the process. All the recycled water is returned to the evaporative quencher loop and none to the loop controlling the demisters and the primary absorber sections. However, under varying SO. sub.