Question 159Steam Plants - 1st Asst/Chief70% to pass
While steaming underway the second engineer reports a high superheater outlet temperature. Which of the following could be a possible cause?
AI Explanation
The correct answer is A) Fouled screen tubes.
A high superheater outlet temperature is typically caused by a restriction in the flow of the superheated steam. Fouled or plugged screen tubes can restrict the flow of the hot exhaust gases through the superheater, causing the superheater outlet temperature to rise. This is because the restricted gas flow reduces the heat transfer from the exhaust gases to the superheater tubes.
The other options are incorrect because high feed water temperature and dirty or plugged superheater tubes would not directly cause a high superheater outlet temperature. They may contribute to other boiler issues, but a high superheater outlet temperature is most likely due to a restriction in the gas flow, such as fouled screen tubes.
Related Questions
#157 Under normal operating conditions, a drop in the steam temperature leaving an uncontrolled interdeck superheater could be caused by a _______________.#158 Dirty generating tube surfaces may cause higher than normal superheater outlet temperatures because _______________.#160 When operating under constant load, the superheated steam temperature may rise above normal if the _______________.#161 While steaming underway the second engineer reports a low superheater outlet temperature. Which of the following could be a possible cause? #162 The valve located between the fuel oil header and the burner valve is known as the _______________.