Which type of boiler uses both water and steam for heating?

Which type of boiler uses both water and steam for heating?

• A. Saturated boiler
• B. Superheated boiler
• C. Fired tube boiler
• D. Composite boiler

Answer: (D)

The composite boiler is designed to use both water and steam for heating purposes, making it versatile for various applications. In this type of boiler, there are typically two sections: one that operates as a water-tube boiler, where water is heated directly and the other that functions as a fire-tube boiler, producing steam. This dual functionality allows the composite boiler to efficiently use waste heat from exhaust gases and can adapt to different operating conditions, providing steam or hot water as needed. Saturated boilers primarily produce steam at the saturation temperature, without superheating, while superheated boilers generate steam at a temperature above saturation, focusing solely on steam output. Fired tube boilers are more specific to the design where the combustion gases pass through tubes surrounded by water, also leading primarily to steam generation. These types do not utilize both water and steam together for the heating process the way composite boilers do.

The composite boiler is designed to use both water and steam for heating purposes, making it versatile for various applications. In this type of boiler, there are typically two sections: one that operates as a water-tube boiler, where water is heated directly and the other that functions as a fire-tube boiler, producing steam. This dual functionality allows the composite boiler to efficiently use waste heat from exhaust gases and can adapt to different operating conditions, providing steam or hot water as needed.

Saturated boilers primarily produce steam at the saturation temperature, without superheating, while superheated boilers generate steam at a temperature above saturation, focusing solely on steam output. Fired tube boilers are more specific to the design where the combustion gases pass through tubes surrounded by water, also leading primarily to steam generation. These types do not utilize both water and steam together for the heating process the way composite boilers do.