Methods for reducing nitrogen oxides emissions from power plants

Details Methods for reducing nitrogen oxides emissions from power plants Methods for reducing nitrogen oxides emissions from power plants

1987-09-23

1988-05-10

Favors, Edward G.

Furnaces

Process

Burning pulverized fuel

44620, 110224, 110342, F23D 100

Patent

active

047427841

ABSTRACT:
Fluctuating prices and conservation of oil demand substitution of coal therefor, but coal as currently used, produces unacceptable amounts of nitrogen oxides. The problem arises from the inherently poor combustion characteristics of such pulverized solid fuels, the long combustion time intervals required, and the great amounts of excess combustion air required to complete combustion. The methods of the present invention minimize the formation of nitrogen oxides by modifying or adding several steps in the combustion process. Heating the coal to evacuate the pores and capillary openings in the coal structure prepares it for suffusion and storage in an inert atmosphere of carbon dioxide to prevent partial oxidation of coal constituents and adsorption or permeation of nitrogen from the air. Many advantages are gained by replacing carbon dioxide in the pores and capillary openings with methanol. These resultant highly reactive fuels permit reduction of excess air without producing undesirable amounts of carbon monoxide. Shortened combustion time allows reduction of the volume of the firebox to minimize retention time at high temperature and to improve boiler efficiency. Further improvements obtain from recirculating some combusted gases to the firebox or adjusting the volume of the firebox, to control retention time at lower firing rates and to minimize slagging.

REFERENCES:
patent: 4381718 (1983-05-01), Carver et al.
patent: 4528918 (1985-07-01), Sato et al.
patent: 4676804 (1987-06-01), Miller et al.
patent: 4702747 (1987-10-01), Meyer et al.

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