Why are baffles used in the steam drums of water tube boilers?

Baffles are utilized in the steam drums of water tube boilers primarily to prevent carryover of water into the steam system. During the boiling process, water can become agitated and can lead to the introduction of water droplets into the steam phase. This carryover can result in water being transported along with steam, which can cause various operational issues, including damage to steam-operated equipment and lower steam quality.

By incorporating baffles, the steam drum can create a separation between the steam and the water. The baffles disrupt the flow of water, allowing the steam to rise more freely while minimizing the opportunity for water droplets to be entrained in the steam flow. This ensures a drier steam exiting the boiler, which is crucial for efficient operation and protection of downstream equipment.

Other aspects such as enhancing heat transfer, reducing noise, or controlling pressure may play roles in boiler operation but are not the primary purpose of baffles in this context. Thus, the focus on preventing water carryover is essential in maintaining the necessary quality and efficiency of the steam produced.