Abstract
An interlock-type combustion controller installed on a gas boiler for industrial use is important for burning a gaseous mixture safely. This controller has a detector that detects the existence of a flame on the burner. Traditionally, a flame-rod type has been the most popular among various flame detectors. However, formation of oxide on the rod, the results of a thermal phenomenon, leads to a decrease in sensitivity of the detector, and hence the rod is expected to be exchanged periodically. Therefore, the development of a new practical flame detector, the characteristics of which deteriorate less with aging than those of conventional flame detectors and which is highly reliable, is desired. In this paper, as a flame detector designed to be installed on a gas boiler, an optical-fiber flame detectors is proposed along with its signal processing system, and the practical design and the tuning condition are described. Finally, the effectiveness of the detector is verified through practical application.
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