Flue gas desulfurization method and apparatus

Patent · Tue Sep 29 00:00:00 EDT 1998

OSTI ID:871867

Madden, Deborah A ^[1]; Farthing, George A ^[2]

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1. Canfield, OH
2. Washington Township, OH

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.

• Research Organization: Babcock and Wilcox Co
• Sponsoring Organization: USDOE
• DOE Contract Number: AC22-92PC92160
• Assignee: McDermott Technology, Inc. (New Orleans, LA)
• Patent Number(s): US 5814288
• Application Number: 08/669762
• OSTI ID: 871867
• Country of Publication: United States
• Language: English

Related Subjects

flue
gas
desulfurization
method
apparatus
combined
furnace
limestone
injection
dry
scrubber
fgd
collects
solids
stream
particulate
collection
device
located
downstream
outlet
convection
pass
upstream
collected
diverted
feed
slurry
preparation
increase
sulfur
oxide
species
removal
efficiency
sorbent
utilization
level
lime
provided
increased
enhances
decreased
loading
helps
maintain
desired
degree
free
moisture
entering
collector
normally
baghouse
oxide species
particulate collector
located downstream
gas desulfurization
sulfur oxide
collection device
dry scrubber
feed slurry
gas stream
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
/423/110/