Question 219Steam Plants - Assistant Engineer
70% to passWhich of the conditions listed can cause the flame of a mechanically atomized burner to be blown away from the burner tip when you are attempting to light off?
AInsufficient excess air is being supplied to the furnace.
BThe diffuser is burned out.
CFuel oil viscosity is too low.
DThe secondary air cone is improperly adjusted.
AI Explanation
The correct answer is B) The diffuser is burned out. When the diffuser of a mechanically atomized burner is burned out, it can no longer effectively atomize the fuel. This results in the fuel not being properly dispersed and mixed with air, causing the flame to be blown away from the burner tip when attempting to light off. The other options are incorrect because: A) Insufficient excess air would cause the flame to be too rich, not blow away. C) Fuel oil viscosity that is too low would result in over-atomization, not blowing the flame away. D) Improper adjustment of the secondary air cone would affect air supply, but not necessarily cause the flame to blow away.
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