Question 478Steam Plants - Assistant Engineer70% to pass
To safely decrease the boiler firing rate, you should always reduce the fuel pressure _______________.
AI Explanation
The correct answer is A) before reducing the forced draft pressure.
To safely decrease the boiler firing rate, you should always reduce the fuel pressure before reducing the forced draft pressure. This is because reducing the forced draft pressure before reducing the fuel pressure can lead to an imbalance in the air-fuel ratio, which can cause incomplete combustion and potentially dangerous conditions in the boiler. By first reducing the fuel pressure, you can ensure a proper air-fuel ratio is maintained, allowing for a safe and controlled decrease in the boiler firing rate.
The other options are incorrect because C) opening the oil recirculating valve and D) opening the fuel pump relief valve do not directly address the need to reduce the fuel pressure before the forced draft pressure.
Related Questions
#476 One factor for determining the minimum feed water inlet temperature to a boiler economizer is the _______________.#477 If there is a sudden drop in the outlet temperature of an uncontrolled superheater, you should _______________.#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? #481 When increasing the firing rate of a boiler, which of the following should be carried out FIRST?