Reducing nitrogen oxides in the flue gases from gas/oil-fired boilers at high-capacity power stations
Investigations have been conducted at gas/oil-fired heat and power stations and central stations, the furnace units at which have been modified, to check measures for reducing emission of nitrogen oxides. High-sulfur oil was burned in all the boilers, the fuel's nitrogen content being less than 0.5%. Excess air was determined in the gas pass before the first convective superheater (or in the cross connection to the second superheater). Air leakage was determined in the circuit from the burners to the point at which gases were removed for recirculation. The content of nitrogen oxides was determined in the same gas pass. Nitrogen oxides analysis was conducted on the spot by a linear-colorimetric method. The indicator tubes were calibrated against a standard. Individual measurements were checked by a chemical method using Griess reagent. To investigate the various ways of lowering NO/sub x/ emission the parameters of the plant required for comprehensive assessment of the effect attained were recorded (effectiveness measures to reduce NO/sub x/, evaluation of reliability, economy, flexibility, etc). These experiments showed that redistribution of the air or fuel through burner rows lowers by 20% the concentration of NO/sub x/ in the combustion products. Employing two-stage combustion of oil in vortex burners, in the furnace of the TP-82 boiler with the opposite wall forced draft units, and when using the KhF TsKB-VTI burners with recirculating gases supplied to the middle duct (PK-19 boiler) leads to 20 to 50% reduction in NO/sub x/ emission. The above combustion arrangement gives the greatest reduction in NO/sub x/ emission. However, its use cannot be considered separately from the features of the processes taking place when burning high-sulfur oil.
- OSTI ID:
- 6561658
- Journal Information:
- Therm. Eng. (USSR) (Engl. Transl.); (United States), Vol. 24:9; Other Information: Translated from Teploenergetika; 24: No. 9, 74-77(1977)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BURNERS
OPERATION
FLUE GAS
DENITRIFICATION
FOSSIL-FUEL POWER PLANTS
FUEL OILS
COMBUSTION
NITROGEN OXIDES
AIR POLLUTION CONTROL
DESIGN
FURNACES
NATURAL GAS
USSR
CHALCOGENIDES
CHEMICAL REACTIONS
ENERGY SOURCES
EUROPE
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASEOUS WASTES
GASES
NITROGEN COMPOUNDS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
POLLUTION CONTROL
POWER PLANTS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions