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Abstract

An unburned carbon and other combustibles monitoring and control system for a fly ash producing fossil-fueled boiler, such as a pulverized coal fired boiler. An infrared imaging camera counts the moving hot particles entrained in the hot gases downstream of the furnace region of the boiler and provides a first signal representative of the number of hot particles in the hot gases over a predetermined period of time. A signal processor is connected to the infrared imaging camera for counting the hot particles for receiving the signal representative of the number of particles in the hot gases and providing a second signal representative of the mass flow of unburned carbon and other combustibles content of the fly ash produced by the boiler, the second signal being a function of the first signal. In the preferred embodiment, the apparatus includes at least one air/fuel control element for controlling the air/fuel ratio of the fossil-fueled boiler and a control system connected to the control element for receiving the second signal representative of the mass flow of unburned carbon and other combustibles content of the fly ash produced by the boiler and a predetermined set point for the mass flow of unburned carbon and other combustibles content of the fly ash produced by the boiler, the control system being operable to adjust the air/fuel control element in response to the second signal and the set point.

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First Claim