Patent ID: 8522553

Claim:
A system for conditioning a working fluid in a combustor, comprising: a. a primary combustion chamber; b. a liner circumferentially surrounding at least a portion of the primary combustion chamber; c. at least one primary fuel nozzle in fluid communication with the primary combustion chamber; d. at least one secondary combustion chamber located upstream from the at least one primary fuel nozzle, wherein each secondary combustion chamber comprises: i. a shroud, wherein the shroud defines a fluid passage having a centerline through the secondary combustion chamber; ii. an opening at an upstream portion of the shroud; iii. a secondary fuel nozzle proximate to the upstream portion of the shroud; and iv. means for igniting fuel in the secondary combustion chamber; wherein the at least one secondary combustion chamber and the centerline are located in an annular passage surrounding the primary combustion chamber.