TVA Clean Coal Technology IV project begins
The Micronized Coal Reburning (MCR) demonstration project of the Tennessee Valley Authority (TVA) is one of nine projects selected for funding under round four of the Clean Coal Technology Program and one of six assigned to PETC for implementation. Awarded in July 1992, this project will be the first full-scale demonstration of the MCR technology, which controls nitrogen oxides (NO[sub x]) emissions from coal-fired steam generators. The TVA demonstration is expected to reduce NO[sub x] emissions by 50 to 60%. The MCR technology itself reduces NO[sub x] emissions to a level of 0.35 to 0.47 pounds per million Btu (0.15 to 0.20 kg/GJ). Micronized coal is very finely pulverized [80% less than 325 mesh (45 [mu])], may constitute up to 30% of the total fuel fired (depending on unit load), and is fired high in the furnace in a fuel-rich reburn zone above the top row of burners. Above the reburn zone, overfire air is injected into the burnout zone at high velocity for good mixing to ensure complete combustion. MCR technology reduces NO[sub x] emissions in the same manner as does natural gas reburning on coal-fired boilers. The entire furnace functions as a low-NO[sub x] burner with the existing burners being operated in a slightly oxidizing mode using accurate fuel/air control. The micronized fuel that is fired substoichiometricall in the reburn zone consumes oxygen very rapidly and converts NO[sub x] to molecular nitrogen. Above the reburn zone, high-velocity overfire air uniformly mixes with the substoichiometric furnace gas to complete combustion. Because it can be used in all standard pulverized coal units, MCR technology allows many facilities to reduce emissions and increase capacity with a minimum capital investment.
- OSTI ID:
- 6324513
- Journal Information:
- PETC Review (Pittsburgh Energy Technology Center); (United States), Vol. 7
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comprehensive report to Congress Clean Coal Technology Program. Micronized coal reburning demonstration for NO[sub x] control on a 175-MWe wall-fired unit: A project proposed by Tennessee River Valley Authority
Demonstration of micronized coal reburning for NO{sub 2} control on a 175 MW unit
Related Subjects
20 FOSSIL-FUELED POWER PLANTS
COAL
COMMINUTION
FURNACES
DESIGN
NITROGEN OXIDES
AIR POLLUTION CONTROL
TENNESSEE VALLEY AUTHORITY
DEMONSTRATION PLANTS
CAPITALIZED COST
COAL PREPARATION
COMBUSTION CHAMBERS
COMBUSTION CONTROL
PULVERIZED FUELS
US CLEAN COAL TECHNOLOGY PROGRAM
CARBONACEOUS MATERIALS
CHALCOGENIDES
CONTROL
COST
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
NATIONAL ORGANIZATIONS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
US ORGANIZATIONS
014000* - Coal
Lignite
& Peat- Combustion
010300 - Coal
Lignite
& Peat- Preparation- (1987-)
200200 - Fossil-Fueled Power Plants- Waste Management