A sudden flame failure in an operating auxiliary boiler, equipped with an automatic combustion control system and burning light fuel, could be attributed to a __________.
• Automatic combustion control systems and how they detect a loss of flame • Typical flame detection devices used on light-fuel auxiliary boilers (e.g., photocells, flame scanners) • Difference between problems that affect ignition start-up versus those that cause a sudden shutdown during normal operation
• Which components are mainly used to SENSE that the flame is present or not, rather than to create the spark? • If the boiler is already running normally and then suddenly trips on flame failure, which item in the list could suddenly INTERRUPT the flame signal without actually changing the fuel properties? • Light fuel oil does not normally have large, rapid changes in viscosity during steady operation; which options instead relate to electrical signal or flame detection issues?
• Identify which options relate to ignition (starting the flame) versus flame monitoring (proving the flame is present) • Check which device in the options would send a continuous flame confirmation signal to the automatic control system while burning light fuel • Eliminate any cause that would be unlikely to change SUDDENLY during normal, steady operation, especially regarding fuel properties
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