Superheaters are essentially a bank of tubes, in the exhaust
gas duct after the boiler, used to heat the steam above the saturation
temperature. The saturated steam enters the inlet header from piping connected
to the steam drum. In a superheater, the saturated steam flows from the
saturated header through the superheater elements into the superheater outlet
header.
Marine boiler superheater
design requires a sensible balancing of economic and practical factors. There
must be a sufficiently large temperature difference between the combustion gas
passing over the superheater surface and the steam within the surface to result
in a superheater of economic proportions. At the same time, there are practical
limitations on superheater metal temperatures, and provision must be made to
arrange superheater elements to resist slag accumulation.
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