The most serious fireside burning of the boiler superheater tubes is the result of __________.
β’ Boiler superheater operation β how steam flows through the tubes and why flow is critical for cooling β’ Heat transfer in furnace gas side β what actually limits tube metal temperature β’ Difference between overheating from lack of steam flow vs. simple flame/gas impingement
β’ Think about what normally keeps superheater tube metal from overheating when the boiler is operating correctly. β’ Which condition would most reduce or stop internal cooling of the tube metal, allowing temperature to rise very quickly? β’ Which of these choices represents a persistent condition that can raise tube metal far above its design limit, rather than just a temporary surface heating effect?
β’ Identify which option directly affects steam flow through the tube and therefore its cooling ability. β’ Consider which option would lead to highest metal temperature, not just hot gas on the outside. β’ Ask: Under which condition would a tube be hottest inside and out, with little or no steam carrying heat away?
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