Confined zone disperson flue gas desulfurization demonstration

Technical Report · Thu May 30 04:00:00 EDT 1991

OSTI ID:5652023

The confined zone desulfurization (CZD) process involves flue gas post-treatment, physically located between the boiler's air heater and the particulate collector, which in the majority of cases is an electrostatic precipitator. The features that distinguish this process from other similar injection processes are: injection of an alkaline slurry directly into the duct, instead of injection of dry solids into the dust ahead of a fabric filter; use of an ultrafine calcium/magnesium hydroxide, type S pressure hydrated dolomitic lime. This commercial product is made from plentiful, naturally occurring, dolomite; low residence time, made possible by the high effective surface area of the type S lime; localized dispersion of the reagent. Slurry droplets contact only part of the gas while the droplets are drying, to remove up to 50 percent of the SO{sub 2} and NO{sub x}. The process uses dual fluid rather than rotary atomizers; and improved ESP performance via gas conditioning from the increased water vapor content, and lower temperatures. The demonstration will be conducted at Penelec's Seward Station, Unit {number sign}15. This boiler is a 147 Mwe coal-fired unit, which utilizes Pennsylvania bituminous coal (approximately 1.2 to 2.5% sulfur). One of the two flue gas ducts leading from the boiler will be retrofitted with the CZD technology. Work performed during this phase consisted of equipment acquisition, installation, and start-up operation. 3 figs., 1 tab.

• Research Organization: Bechtel Corp., San Francisco, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC22-91PC90546
• OSTI ID: 5652023
• Report Number(s): DOE/PC/90546-T2; ON: DE91016578
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ATOMIZATION
CHALCOGENIDES
CHEMICAL REACTIONS
DESULFURIZATION
DISPERSIONS
DOCUMENT TYPES
DUCTS
FLUE GAS
GASEOUS WASTES
MIXTURES
NITROGEN COMPOUNDS
NITROGEN OXIDES
NOZZLES
OXIDES
OXYGEN COMPOUNDS
PROGRESS REPORT
SLURRIES
SORBENT INJECTION PROCESSES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SUSPENSIONS
WASTES