The primary objective of a soot blower is to dislodge deposits from boiler tubes so they can be carried away by flue gases.

Soot blowing is the process of using a high-velocity jet of a cleaning medium (usually steam or air) to blow away ash, soot, and slag deposits that accumulate on the heat exchange surfaces (tubes) of a boiler.

: The kinetic energy of the jet cuts through and dislodges soot and fused slag.

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Boiler runs at 70% load. Superheater ΔP rises from 0.5 to 1.2 kPa over 6 hours. AISB triggers LRSB #3 and #4 sequentially. After 8 minutes, ΔP drops to 0.6 kPa. No blowing occurs in reheater zone because its fouling index is still 0.9.