Staged fluidized-bed coal combustor for boiler retrofit

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:6222505

Rehmat, A ^[1]; Dorfman, L; Shibayama, G ^[2]; Waibel, R ^[3]

---

1. Institute of Gas Technology, Chicago, IL (United States)
2. Fluor-Daniels, Inc., Chicago, IL (United States)
3. Zink (J.) and Co., Tulsa, OK (United States)

The Advanced Staged Fluidized-Bed Coal Combustion System (ASC) is a novel clean coal technology for either coal-fired repowering of existing boilers or for incremental power generation using combined-cycle gas turbines. This new technology combines staged combustion for gaseous emission control, in-situ sulfur capture, and an ash agglomeration/vitrification process for the agglomeration/vitrification of ash and spent sorbent, thus rendering solid waste environmentally benign. The market for ASC is expected to be for clean coal-fired repowering of generating units up to 250 MW, especially for units where space is limited. The expected tightening of the environmental requirements on leachable solids residue by-products could considerably increase the marketability for ASC. ASC consists of modular low-pressure vessels in which coal is partially combusted and gasified using stacked fluidized-bed processes to produce low-to-medium-Btu, high-temperature gas. This relatively clean fuel gas is used to repower/refuel existing pulverized-coal, natural gas, or oil-fired boilers using bottom firing and reburning techniques. The benefits of ASC coal-fired repowering include the ability to repower boilers without obtaining additional space while meeting the more stringent environmental requirements of the future. Low NO{sub x}, SO{sub x}, and particulate levels are expected while a nonleachable solid residue with trace metal encapsulation is produced. ASC also minimizes boiler modification and life-extension expenditures. Repowered efficiencies can be restored to the initial operating plant efficiency, and the existing boiler capacity can be increased by 10%. Preliminary cost estimates indicate that ASC will have up to a $250/kW capital cost advantage over existing coal-fired repowering options. 4 figs., 4 tabs.

• Research Organization: Institute of Gas Technology, Chicago, IL (United States)
• Sponsoring Organization: IGT; Institute of Gas Technology, Chicago, IL (United States)
• OSTI ID: 6222505
• Report Number(s): CONF-911051-3; ON: TI92002492
• Resource Relation: Conference: International conference on environmental control of combustion processes, Honolulu, HI (United States), 7-10 Oct 1991
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
ASHES
AGGLOMERATION
VITRIFICATION
BOILERS
RETROFITTING
SULFUR CONTENT
REMOVAL
AIR POLLUTION ABATEMENT
FLUIDIZED-BED COMBUSTORS
SOLID WASTES
SORPTION
TURBINES
COMBUSTION PRODUCTS
COMBUSTORS
MACHINERY
POLLUTION ABATEMENT
RESIDUES
TURBOMACHINERY
WASTES
014000* - Coal
Lignite
& Peat- Combustion
200104 - Fossil-Fueled Power Plants- Components
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
200500 - Fossil-Fueled Power Plants- Environmental Aspects- (1990-)