Fireside burning of boiler superheater tubes is a direct result of __________.
⢠Boiler superheater operation ā how steam flow through the tubes removes heat from the metal ⢠Heat transfer on the fireside ā what happens if cooling on the water/steam side is reduced or stopped ⢠Typical causes of overheating and tube failure in superheaters
⢠Ask yourself: under what condition would the metal of a superheater tube get much hotter than normal even though the same flame is present? ⢠Think about the role of steam flow inside the tubes: what happens to tube temperature if steam flow is greatly reduced or stopped? ⢠Which option describes a condition that would remove effective cooling from the inside of the tube rather than just exposing it to hot gas or fuel on the outside?
⢠Be clear on what "fireside" means (gas side vs water/steam side). ⢠Consider which options are normal design conditions (things the tubes are built to handle) versus an abnormal condition that leads to overheating. ⢠Verify which choice directly causes loss of internal cooling of the tubes, allowing metal temperature to rise excessively.
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