Importance

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Abstract

A combustor includes a premixer fuel injector that injects fuel into the combustor and ignites mixture of the fuel and compressed air to produce exhaust gas, a transition duct through which the exhaust gas passes, a secondary fuel injector disposed in an opening of the transition duct for providing further fuel to the exhaust gas, and a collar fixedly coupled to the transition duct and positioned to surround the secondary fuel injector. The collar cooperates with the secondary fuel injector to define an upstream purge path disposed on an upstream side of the opening and a downstream purge path disposed on a downstream side of the opening by a flow direction of the exhaust gas that each provides a flow communication between an exterior of the transition duct and an interior of the transition duct. The upstream purge path has a larger flow area than the downstream purge path.

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First Claim