Importance

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Abstract

Combustion systems and processes are disclosed. A cross-limiting override control system is configured to transmit remote set points to flow controllers configured to control the flow rates of a primary firing fuel and air to a combustion apparatus. A temperature controller is configured to transmit a temperature demand signal based on a temperature in a combustion zone in the combustion apparatus. An analyzer controller is configured to transmit a stoichiometric ratio control signal based on an excess oxygen level exiting the combustion zone in the combustion apparatus. The cross-limiting override control system includes a dynamic stoichiometric ratio multiplier element configured to receive the stoichiometric ratio control signal transmitted from the analyzer controller, a high signal select element configured to receive the temperature demand signal transmitted from the temperature controller, and a low signal select element configured to receive the temperature demand signal transmitted from the temperature controller.

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First Claim