PURPOSE: To enable detection of incomplete combustion, by a method wherein a detecting part is mounted in flame at the end of a burner port in a burner having a number of burner port rows, and detects condition on the presence of flame through utilization of the lifting phenomenon of flame at the end during oxygen deficiency.
CONSTITUTION: During normal combustion, the fuel is jetted through a burner port 1 in a burner 7 to form flame 3, a detecting part 4 is heated to a high temperature, and a valve 5 is successively opened through an electric circuit 8. When oxygen becomes deficient, the flame extends, the detecting part 4 is enveloped in a flame 3a to keep it to a limited high temperature, and combustion continues in a condition that a valve 5 is left opened. When the flame is brought to an oxygen defficiency state, the flame 3a is changed to form a flame 3b. In which case, the detecting part 4 is not enveloped in flame and cooled, thereby a resistance value changing to close a gas valve 5 through an electric circuit 8 to stop combustion. Thus, installation of the detecting part at a location, where the fuel is most apt to fly, of the burner port enables detection of incomplete combustion at a point of time when production of CO is reduced and stopping of combustion.
KOMAI YUKIROU
TANAKA EIICHI
NISHIYAMA TAKAO
