Question 315Steam Plants - Assistant Engineer

The correct answer is B) increase in the forced draft air pressure before an increase in the fuel oil flow. When firing a boiler in local manual control, an increase in boiler load must be accompanied by an increase in the forced draft air pressure before an increase in the fuel oil flow. This is because the forced draft air pressure needs to be increased first to provide the necessary oxygen for the increased fuel flow, ensuring efficient combustion and preventing incomplete burning or smoke. The other options are incorrect because A) a decrease in the forced draft air pressure is not the correct response, C) an increase in the fuel oil flow before the forced draft pressure is incorrect, and D) simultaneous increase or decrease in both parameters is also not the correct approach.