Question 174Steam Plants - Assistant Engineer
70% to passWhich of the listed conditions can cause high superheater outlet steam temperature in an automated boiler?
AInsufficient excess air.
BOperating with a bypassed economizer.
CExcessive heat transfer in the control desuperheater.
DHigh water level in the steam drum.
AI Explanation
The correct answer is B) Operating with a bypassed economizer. When the economizer is bypassed, less heat is extracted from the flue gases before they enter the superheater. This results in higher superheater inlet temperatures, leading to higher superheater outlet steam temperatures. The other options are incorrect because: A) Insufficient excess air would reduce heat transfer, leading to lower superheater outlet temperatures. C) Excessive heat transfer in the control desuperheater would actually lower the superheater outlet temperature. D) High water level in the steam drum would not directly affect the superheater outlet temperature.
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