Simplified combustion-air flow control
Resumo
The described method can be applied whenever a damper or valve is used for controlling the fluid flow. Usually separate devices are used for measuring and controlling the flow: for example pressure differential device for measuring and damper or valve for controlling. Two examples of controlling combustion-air flow for a coal-dust fired steam boiler show how, with sufficient accuracy, dampers can be used for both. In large scale units such an approach reduces investment costs due to avoiding the need for expensive measuring equipment and improves the reliability of air flow control due to avoiding the usual problems with clogging of the impulse lines or problems with poor calibration of differential pressure transmitters.Downloads
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