Question 312Steam Plants - Assistant Engineer70% to pass
Excessive accumulation of carbon deposits on a boiler burner throat ring and diffuser could result in _______________.
AI Explanation
The correct answer is D) a decrease in boiler efficiency.
Excessive carbon deposits on the boiler burner throat ring and diffuser can restrict the flow of air, reducing the amount of excess air available for combustion. This decreased air flow leads to incomplete combustion, which in turn reduces the overall efficiency of the boiler. The carbon deposits act as an insulator, hindering heat transfer from the flame to the boiler water, also contributing to the decrease in boiler efficiency.
The other options are incorrect because: A) reduced fuel oil pressure is not a direct result of carbon deposits, B) increased heat transfer and overheating would not occur due to the insulating effect of the carbon deposits, and C) too much excess combustion air is the opposite of what happens when carbon deposits restrict air flow.
Related Questions
#310 Insufficient air for combustion in a boiler furnace could result in a _______________.#311 In a boiler furnace, incomplete combustion due to insufficient air yields an excess amount of _______________.#313 When the flame scanner senses flame failure during boiler operation, which of the listed events will occur FIRST? #314 Combustion control systems on automatic boilers are designed to prevent immediate burner ignition after a normal or safety shutdown in order to allow time for _______________.#315 When firing a boiler in local manual control, an increase in boiler load must be accompanied by a/an _______________.