tion. Flue gas desulfurization (FGD

tion. Flue gas desulfurization (FGD) systems are in current operation on several lignite-fired
utility boilers. Flue gases can be treated through wet, semi-dry, or dry desulfurization processes of either
the throwaway type (in which all waste streams are discarded) or the recovery (regenerable) type (in
which the SOx absorbent is regenerated and reused). To date, wet systems are the most commonly
applied. Wet systems generally use alkali slurries as the SOx absorbent medium and can be designed to
remove in excess of 90 percent of the incoming SOx. Lime/limestone scrubbers, sodium scrubbers, spray
drying, and dual alkali scrubbing are among the commercially proven FGD techniques.
Spray drying is a dry scrubbing approach in which a solution or slurry of alkaline material is
sprayed into a reaction vessel as a fine mist and mixes with the flue gas. The SO2 reacts with the alkali
solution or slurry to form liquid-phase salts. The slurry is dried by the latent heat of the flue gas to about
1 percent free moisture. The dried alkali continues to react with SO2 in the flue gas to form sulfite and
sulfate salts. The spray dryer solids are entrained in the flue gas and carried out of the dryer to a
particulate control device such as an ESP or baghouse.
Limestone may also be injected into the furnace, typically in an FBC, to react with sulfur dioxide
(SO2) and form calcium sulfate. An FBC is composed of a bed of inert material that is suspended or
"fluidized" by a stream of air. Lignite is injected into this bed and burned. Limestone is also injected
into this bed where it is calcined to lime and reacts with SO2 to form calcium sulfate. Particulate matter
emitted from the boiler is generally captured in a cyclone and recirculated or sent to disposal. Additional
PM control equipment, such as an ESP or baghouse, is used after the cyclone to further reduce particulate
emissions

ผลลัพธ์ (อังกฤษ) 2:

tion. Flue Gas desulfurization (FGD) Systems are in current Operation on several LIGNITE-fired
boilers Utility. Wet Flue Gases Through Can be treated, semi-Dry, Dry or desulfurization processes of either
the throwaway Type (in which all waste Streams are discarded) or the Recovery (Regenerable) Type (in
which the SOx absorbent is regenerated and reused). To date, are the Most commonly Wet Systems
Applied. Wet Systems Alkali slurries generally use as the SOx absorbent and Medium Can be designed to
Remove in excess of 90 PERCENT of the Incoming SOx. Lime / limestone scrubbers, Sodium scrubbers, Spray
Drying, and dual Alkali scrubbing are among the Commercially proven FGD techniques.
Spray Drying is a Dry scrubbing approach in which a Solution or Slurry of alkaline Material is
sprayed Into a Reaction Vessel as a Fine Mist and. mixes with the flue gas. The SO2 reacts with the Alkali
Solution or Slurry Liquid-phase to form salts. Slurry is the latent heat of the Dried by the Flue Gas About to
1 PERCENT Moisture free. React to the Dried Alkali Continues with the SO2 in Flue Gas to form sulfite and
sulfate salts. The Spray Dryer solids are entrained in the Flue Gas and carried out of the Dryer to a
particulate Control Device such as an ESP or baghouse.
Limestone May also be injected Into the Furnace, typically in an FBC, to React with sulfur dioxide
(SO2). and form calcium sulfate. Bed of an FBC is composed of a suspended or inert Material that is
"fluidized" by a Stream of Air. Lignite is injected into this bed and burned. Limestone is also injected
Bed Into this where it is calcined to Lime and reacts with SO2 to form calcium sulfate. Matter particulate
emitted from the Boiler is generally captured and recirculated in a Cyclone or sent to Disposal. Additional
PM Control Equipment, such as an ESP or baghouse, is used to further after the Cyclone Reduce particulate
emissions.