What does the term "Fire Tube Boiler" refer to specifically?

The term "Fire Tube Boiler" specifically refers to a boiler where combustion takes place inside tubes. In this type of boiler, hot gases from the combustion process flow through the tubes, which are surrounded by water. This design allows for efficient heat transfer from the hot gases to the water, facilitating the generation of steam or heated water.

Fire tube boilers are characterized by their compact design and relatively low pressure capabilities, making them suitable for various applications, including heating and district energy systems. The arrangement of the tubes allows for the effective absorption of heat into the water, leading to efficient operation. This configuration contrasts with water tube boilers, where water flows through the tubes and is heated by hot gases outside of the tubes.

Understanding this specific aspect enhances clarity on how fire tube boilers function and their role within the broader context of boiler technology and applications.