Glossary
Alternative cleaning
IK long retract sootblower
Also known as IK sootblower, long retract sootblower, IK lance.
An IK long retract sootblower advances a long horizontal steam lance into the boiler's convective-pass gas flow, rotates the lance through a full revolution while emitting steam jets through paired side nozzles, then retracts the lance back into a parked position outside the flue gas. The IK type is the workhorse of convective superheater and reheater cleaning on industrial and utility boilers.
Why it dominates the convective pass
- Steam jets reach deep between tube banks
- Lance rotation cleans 360° of surrounding tubes per insertion
- Lance is fully withdrawn between operations, protecting it from continuous high-temperature exposure
- Mature design with several decades of operating experience
Trade-offs
- Tube erosion — documented at nozzle impingement points and on the directly-opposite tube row
- Steam consumption — typical IK consumes 5–15 tonnes of medium-pressure steam per cycle
- Mechanical complexity — drive motor, lance, packing, nozzles, all require maintenance
- Lance bowing — long lances sag and bow under thermal cycling
Sonic horns complement IK sootblowers by providing continuous low-intensity cleaning between cycles, allowing the IK to fire less frequently and reducing its contribution to tube erosion.
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.
- 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.
- Retract sootblowerA retract sootblower withdraws its lance into a parked position outside the flue gas between operations, protecting it from continuous high-temperature exposure.
- SuperheaterA superheater is a tube bank that raises steam temperature beyond the saturation point using flue-gas heat. Sticky alkali ash and slag deposits are the dominant fouling concerns.