Question 477Steam Plants - Assistant Engineer70% to pass
If there is a sudden drop in the outlet temperature of an uncontrolled superheater, you should _______________.
AI Explanation
The correct answer is B) check for high water level in the drum.
A sudden drop in the outlet temperature of an uncontrolled superheater indicates a problem with the steam generation process, which is often caused by a high water level in the boiler drum. When the water level is too high, it can lead to carryover of water into the superheater, causing a rapid drop in the superheater outlet temperature. Therefore, the appropriate action is to check the boiler drum water level and make necessary adjustments to maintain the proper water level.
The other options are not the correct responses in this situation. Increasing the firing rate (A) or reducing the forced draft fan speed (D) would not address the root cause of the problem, which is the high water level. Bypassing the air heater (C) is also not the appropriate action to take in response to a sudden drop in superheater outlet temperature.
Related Questions
#475 During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as _______________.#476 One factor for determining the minimum feed water inlet temperature to a boiler economizer is the _______________.#478 To safely decrease the boiler firing rate, you should always reduce the fuel pressure _______________.#479 As the percentage of CO2 in the stack gas decreases, you can assume that _______________.#480 Which of the following items should be checked each time the firing rate or forced draft pressure is adjusted?