Quote:
Originally Posted by RickB
It isn't air that is used on marine boilers, it is steam. Only a land based powerplant can afford the space and energy to use compressed air. The only thing a marine soot blower uses air for is the motor that rotates the lance. The soot blower lance and nozzles are located inside the boiler and aimed at the set of tubes they serve. At least once a day the soot blowers are used to "blow tubes" and remove accumulated soot that acts as an insulator and can create a fire hazard.
The soot blowers are fed by superheated steam (very hot and dry) in a sequence starting low and ending high. The forced draft fans are turned up to supply more air flow to carry off the dislodged soot and that is why it looks like the stack is "blowing."
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most of the times they would blow the tubes on the 12 to 4 watch