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Title: Flue gas desulfurization method and apparatus

A combined furnace limestone injection and dry scrubber flue gas desulfurization (FGD) system collects solids from the flue gas stream in first particulate collection device located downstream of an outlet of a convection pass of the furnace and upstream of the dry scrubber. The collected solids are diverted to the dry scrubber feed slurry preparation system to increase sulfur oxide species removal efficiency and sorbent utilization. The level of lime in the feed slurry provided to the dry scrubber is thus increased, which enhances removal of sulfur oxide species in the dry scrubber. The decreased particulate loading to the dry scrubber helps maintain a desired degree of free moisture in the flue gas stream entering the dry scrubber, which enhances sulfur oxide species removal both in the dry scrubber and downstream particulate collector, normally a baghouse.
Authors:
 [1] ;  [2]
  1. (Canfield, OH)
  2. (Washington Township, Stark County, OH)
Publication Date:
OSTI Identifier:
871782
Report Number(s):
US 5795548
US patent application 08/611605
DOE Contract Number:
AC22-92PC92160
Resource Type:
Patent
Research Org:
Babcock and Wilcox Co
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
flue; gas; desulfurization; method; apparatus; combined; furnace; limestone; injection; dry; scrubber; flue; gas; desulfurization; fgd; collects; solids; flue; gas; stream; particulate; collection; device; located; downstream; outlet; convection; pass; furnace; upstream; dry; scrubber; collected; solids; diverted; dry; scrubber; feed; slurry; preparation; increase; sulfur; oxide; species; removal; efficiency; sorbent; utilization; level; lime; feed; slurry; provided; dry; scrubber; increased; enhances; removal; sulfur; oxide; species; dry; scrubber; decreased; particulate; loading; dry; scrubber; helps; maintain; desired; degree; free; moisture; flue; gas; stream; entering; dry; scrubber; enhances; sulfur; oxide; species; removal; dry; scrubber; downstream; particulate; collector; normally; baghouse; oxide species; oxide species; oxide species; particulate collector; located downstream; gas desulfurization; gas desulfurization; sulfur oxide; sulfur oxide; sulfur oxide; collection device; dry scrubber; dry scrubber; dry scrubber; dry scrubber; dry scrubber; dry scrubber; dry scrubber; dry scrubber; feed slurry; feed slurry; gas stream; gas stream; flue gas; flue gas; flue gas; flue gas; sorbent utilization; scrubber flue; slurry preparation; stream entering; removal efficiency; device located; desired degree; free moisture; combined furnace; collects solids; particulate collection; furnace limestone; desulfurization method; limestone injection /422/96/110/