Confined zone dispersion flue gas desulfurization demonstration. Quarterly report No. 9, November 17, 1992--February 16, 1993

Technical Report · Fri Oct 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/10103806· OSTI ID:10103806

The CZD process involves injecting a finely atomized slurry of reactive lime into the flue gas duct work of a coal-fired utility boiler. The principle of the confined zone is to form a wet zone of slurry droplets in the middle of the duct confined in an envelope of hot gas between the wet zone and the duct walls. The lime slurry reacts with part of the SO{sub 2} in the gas, and the reaction products dry to form solid particles. A solids collector, typically on electrostatic precipitator (ESP) downstream from the point of injection, captures the reaction products along with the fly ash entrained in the flue gas. The waste product is composed of magnesium and calcium sulfite and sulfate, with some excess lime. This product mixed with fly ash is self-stabilizing because of the excess lime values, and thus tends to retain heavy metals in insoluble forms within the fly ash. The demonstration is being conducted at Penelec`s Seward Station, Unit No. 15. This boiler is a 147 MWe coal-fired unit, which utilizes Pennsylvania bituminous coal (approximately 1.2 to 2.5% sulfur). Progress is described for the ninth quarter.

• Research Organization: Bechtel Corp., San Francisco, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FC22-91PC90546
• OSTI ID: 10103806
• Report Number(s): DOE/PC/90546-T10; ON: DE94002403; BR: AZ0501030
• Resource Relation: Other Information: PBD: 1 Oct 1993
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
BITUMINOUS COAL
COMBUSTION
SORBENT INJECTION PROCESSES
SULFUR DIOXIDE
AIR POLLUTION CONTROL
NITROGEN OXIDES
FLY ASH
DUCTS
ELECTROSTATIC PRECIPITATORS
FOSSIL-FUEL POWER PLANTS
SLURRIES
LIMESTONE
DOLOMITE
PROGRESS REPORT
200202
540120
NOXIOUS GAS AND PARTICULATE EMISSIONS
CHEMICALS MONITORING AND TRANSPORT