What does the term "Combustion Gas Pass" refer to in boiler design?

The term "Combustion Gas Pass" in boiler design refers to the area where combustion gases circulate after they have been generated in the combustion chamber. This section is crucial for efficient heat transfer, as the hot gases flow through the tubes and transfer their heat to the water or steam inside those tubes. Proper design and sizing of the combustion gas pass are vital to ensure optimal heat exchange, minimize fuel consumption, and prevent issues related to exhaust gas buildup.

The other options focus on different aspects of boiler operation. The section where water is heated pertains to the parts of the boiler that are directly involved in heating the water or converting it to steam. This is often distinct from the gas pass, which is where the gases travel after combustion has occurred. The channel for steam exit relates to the pathway that steam takes to leave the boiler, while the space for condensation refers to areas where steam may cool and condense back to water, which is more applicable to certain types of condensed systems rather than the combustion process itself.