Patent ID: 8673221
Filing Date: 2014-03-18
Classification: B01D,F01K,F23J,F23N

Abstract:
1. An apparatus for denitrification of flue gases of a fossil-fired steam generator, in particular of a steam generator boiler of a power plant, with devices ( 10 - 12 ) for injecting a reagent, active in a predetermined temperature range, into an inner space ( 18 ) of the steam generator ( 1 ) containing hot combustion gases, wherein the injection devices ( 10 - 12 ) comprise a multiplicity of injection lances ( 10 ) arranged in a spatial distribution, and also a control device ( 12 - 14 ) for determining the respective temperature distribution ( 16 ) in the inner space ( 18 ) and for selecting suitable injection lances ( 10 ) for injection on the basis of the temperature distribution ( 16 ), and wherein the control device ( 12 - 14 ) is provided for indirectly determining the temperature distribution ( 16 ) in the inner space ( 18 ) on the basis of at least one operating parameter of the steam generator ( 1 ) which is critical for the temperature distribution, wherein the control device ( 12 - 14 ) comprises an image sensor ( 14 ) detecting a flickering region ( 15 ) of at least one of the burner flames and an image evaluation device and wherein the control device ( 12 - 14 ) is provided for indirectly determining the temperature distribution ( 16 ) in the inner space ( 18 ) on the basis of the flicker frequency as an operating parameter critical for the respective temperature distribution ( 16 ).