Method of introducing dry sulfur oxide absorbent material into a furnace
AssigneeCombustion Engineering, Inc.
InventorRalph D. Winship
Life of this patent
Estimating the term…
Abstract
Emissions of sulfur oxides produced during combustion of a sulfur-bearing fossil fuel in a furnace chamber 10 are reduced by injecting a sulfur oxide absorbing particulate into the product gases in an upper region 60 of the furnace chamber. The sulfur oxide absorbing material is dispersed into a quantity of air which is introduced in the furnace chamber through a plurality of nozzles 80, 82 and 84 disposed at different elevations. The air streams with entrained absorbent are introduced at each elevation tangent to an imaginary circle, with the radii of the circles of the elevations being different, thereby distributing the sulfur oxide absorbent over a wide volume of the furnace chamber.
Claims5
In a fossil fuel-fired steam generator having a vertically elongated furnace with a gas outlet, steam generating tubes lining the walls of said furnace, fuel injection ports located in a lower region of the furnace remote from the gas outlet thereof, windbox means associated with the fuel injection ports for supplying combustion air to the furnace, and a gas exit duct opening to the gas outlet of said furnace for conveying gases therefrom, a method of firing said furnace comprising:
- a. combusting a sulfur-bearing fuel in a first quantity of air in a first zone in the lower region of said furnace remote from the gas outlet thereof to generate hot product gases;
- b. dispersing a sulfur oxide absorbing particulate material in a second quantity of air;
- c. injecting the sulfur oxide absorbing particulate material dispersed in a second quantity of air into the product gases in a second zone in an upper region of said furnace between the first zone and the gas outlet of said furnace at at least a first and second elevation within the second zone through a plurality of air streams introduced at each elevation;
- and
- d. directing the sulfur oxide absorbing particulate material containing air streams introduced at the first elevation tangentially to a first imaginary circle within the second zone, and directing the sulfur oxide absorbing particulate material containing air streams introduced at the second elevation tangentially to a second imaginary circle within the second zone, the first and second imaginary circles having differing radii, the step of dispersing a sulfur oxide absorbing particulate material in a second quantity of air into the product gases in a second zone comprising splitting the second quantity of air into a plurality of air streams, the pluality of air streams subdivided into at least a first and a second portion disposed about the periphery of said furnace at the first and the second elevations respectively;
- entraining the sulfur oxide absorbing particulate material into a carrier gas;
- and dispersing a portion of the carrier gas with the entrained sulfur oxide absorbing particulate material into each of the plurality of air streams.
Dependencies are inferred from the claim text.