Steam Boilers are a form of large water content boilers used to provide customers with steam, as a heat transfer media. Typically, the quality of steam provided by these units are much higher than forced circulation steam generators. The higher quality of steam mitigates the use of steam separators or steam accumulators.
When discussing steam boilers, there are two distinct types of large water content boilers, water tube and fire tube. Water tube boilers are designed with water inside the tubes of the boiler, while gases surround the tubes. As the water temperature increases steam begins to develop a travel to the upper portion of the boiler, typically called the steam drum. The cooler water travels through the down-comers to the mud drum, where the water will be reheated. Fire tube boilers are designed with gases traveling through numerous tubes immersed in water. The hot gases heat up the tubes which heat up the water, in turn generating steam. Generally, fire tube boilers cannot produce steam at very high pressures.
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