The fundamental difference between fire-tube and water-tube boilers lies in which medium passes through the tubes: hot combustion gases in fire-tube boilers and water (or steam-water mixture) in water-tube boilers. This design difference dictates their respective applications and operational characteristics. In a fire-tube boiler, hot combustion gases from the furnace pass through tubes that are surrounded by water. The heat from the gases is transferred through the tube walls to the water, generating steam. Fire-tube boilers are generally simpler in design and less expensive to....
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