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36. What is the cause of «laning» in a boiler tube bank?
Laning occurs due to obstructions within a boiler tube bank, forcing hot gases to flow through limited passages. Excessive slag accumulation on the tubes restricts gas flow in some areas, creating these preferential flow paths and uneven heat transfer. Other factors like fuel oil pressure, furnace volume, and air flow do not directly cause this localized blockage.
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