Patent ID: 7264466
Filing Date: 2007-09-04
Classification: F23C

Abstract:
1. An apparatus for use with a radiant tube in which combustion proceeds downstream through a combustion zone extending along the length of the tube, the apparatus comprising: a staging structure configured to direct reactants into the combustion zone in stages; the staging structure including a primary reactant tube having an open end configured as a first stage reactant inlet to the combustion zone, with the primary reactant tube configured to extend within the radiant tube to define an annular mixing chamber radially between the primary reactant tube and the radiant tube; the staging structure further including a baffle configured to be interposed between the mixing chamber and the combustion zone, with the baffle defining a second stage reactant inlet communicating the mixing chamber with the combustion zone, and defining a third stage reactant inlet communicating the mixing chamber with the combustion zone at a location downstream of the second stage reactant inlet.