Glossary
Alternative cleaning
Retract sootblower
Also known as retractable sootblower, retract blower.
A retract sootblower withdraws its lance into a parked position outside the boiler flue gas between cleaning operations. The retracted position protects the lance from continuous high-temperature exposure, allowing the use of relatively economical materials for long-life lances even in service above 1,000 °C.
The two principal retract designs are the IK long retract (used for cross-pass convective-bank cleaning) and short wall-blower retracts (used for waterwall cleaning).
Why retract over fixed designs
- Lance does not see continuous flue-gas exposure
- Lance materials can be less exotic (and cheaper)
- Inspection and replacement of the lance is straightforward
- Cleaning sequencing can be precisely controlled in time
The mechanical complexity (drive motor, packing, sealing, position sensing) is the trade-off — retract designs need more maintenance than fixed alternatives.
Related terms
Related terms
- Steam sootblowerA steam sootblower projects high-pressure steam jets onto boiler tube banks to dislodge soot and ash. Effective but causes documented tube erosion and consumes valuable boiler steam.
- IK long retract sootblowerAn IK sootblower advances a long steam lance into the gas path, rotates through 360°, and retracts. The workhorse of convective superheater and reheater cleaning.
- IR rotary sootblowerAn IR sootblower is a short fixed rotating lance with permanently-positioned nozzles. Common on air heaters and deeper convective banks; smaller than IK long retracts.
- WaterwallWaterwalls are panels of vertical evaporator tubes welded into a gas-tight membrane that line the furnace. They absorb radiant heat and produce most of the boiler's steam.