What is the purpose of longitudinal baffles in a boiler?

Prepare for the 3rd Class Power Engineering (3B1) Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Longitudinal baffles in a boiler serve the primary purpose of directing the flow of flue gases. By causing the gases to flow at right angles to the tubes, these baffles enhance the heat transfer efficiency. The design ensures that the gases have a longer path through the boiler, promoting greater interaction with the tube surfaces, which increases the overall heat exchange process. As a result, this arrangement allows for improved thermal performance and energy efficiency of the boiler system.

In contrast, the other answer choices do not accurately reflect the function of longitudinal baffles. For instance, while baffles can certainly influence flow direction, their primary role is not merely to increase water flow rates or to support structural integrity. Therefore, it is essential to understand that the key function of longitudinal baffles is specifically geared toward optimizing the flow of gases and enhancing heat transfer, making the directional flow at right angles to the tubes the correct answer.

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