Question 157Steam Plants - 1st Asst/Chief70% to pass
Under normal operating conditions, a drop in the steam temperature leaving an uncontrolled interdeck superheater could be caused by a _______________.
AI Explanation
The correct answer is A) a decrease in combustion gas velocity through the superheater.
The reasoning is that in an uncontrolled interdeck superheater, the steam temperature leaving the superheater is primarily dependent on the temperature of the combustion gases flowing through the superheater. A decrease in the combustion gas velocity would reduce the heat transfer to the steam, causing a drop in the steam temperature leaving the superheater.
The other options are incorrect because: B) a fouled economizer would affect the feed water temperature, not the superheater performance; C) a decrease in steam velocity through the superheater would not cause a temperature drop; and D) a drop in feed water temperature would not directly impact the superheater steam temperature under normal operating conditions.
Related Questions
#155 An excessively high superheater temperature could be the result of _______________.#156 Insufficient combustion air supply to the furnace would cause _______________.#158 Dirty generating tube surfaces may cause higher than normal superheater outlet temperatures because _______________.#159 While steaming underway the second engineer reports a high superheater outlet temperature. Which of the following could be a possible cause? #160 When operating under constant load, the superheated steam temperature may rise above normal if the _______________.