Question 177Motor Plants - 1st Asst/Chief

The correct answer is C) Through tangential slots in the sprayer plate. In a typical auxiliary boiler return flow fuel oil system, the fuel oil enters the whirling chambers of the sprayer plates through tangential slots in the sprayer plate. This tangential entry creates a swirling motion that helps atomize the fuel oil as it is sprayed into the boiler combustion chamber. The swirling action provided by the tangential slots is a key design feature that improves the combustion efficiency of the auxiliary boiler. The other answer choices are incorrect because: A) the fuel oil does not enter through the outer barrel tube, B) the fuel oil does not enter through drilled passages in the sprayer plate, and D) the fuel oil does not enter through baffles in the orifice plate. The tangential slots in the sprayer plate are the correct path for the fuel oil to enter the whirling chambers.