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US 7,622,093 B2Granted
Method for zonal injection of chemicals into a furnace convective pass to reduce pollutants from flue gases
AssigneeDoosan Babcock Energy America LLC
InventorsStuart Arrol, Peter Melling, George Anthony Yates, Michael J. Smith, Gerard J. W. C. Hesselmann, Barbara Lefebvre, John Macphail, Keith W. Morris
Life of this patent
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Abstract
Zonal injection of varying compositions of chemicals, particularly an ammonia-based reagent and hydrocarbon, through injection lances arranged in a grid formation to define planar zones in a furnace convective pass of a furnace. The supply of chemicals is controlled so as to be individually determined for each discrete zone of the grid depending on conditions in that zone.
Claims4
A method of reducing pollutants in flue gases from a furnace having a convection pass comprising the steps of
- installing an injector grid arrangement in the convective pass to define a plurality of planar zones formed of lances having apertures for injecting reagents into the flue gases;
- providing chemicals for reducing pollutants in the flue gas;
- supplying the chemicals to the injector grid arrangement;
- controlling the chemicals supplied to the injector grid arrangement to cause each of the zones to receive a controlled amount of the chemicals depending upon conditions in that zone to reduce pollutants in the flue gases,
- said chemicals providing step including providing an ammonia-based reagent and a hydrocarbon.
2 more elements
Dependencies are inferred from the claim text.