---
title: "Sonic sootblower"
description: "A sonic sootblower is a sonic horn applied specifically to boiler heat-transfer surfaces — economisers, superheaters, reheaters, air heaters and convective-pass tube banks. The term carries over the \"sootblower\" lineage from the steam and air lances that historically performed this duty, but the cleaning mechanism is fundamentally different: a sonic sootblower uses pulsed low-frequency sound rather than a steam jet."
canonical_url: "https://sylio.co/glossary/sonic-sootblower"
last_updated: "2026-06-28T02:29:29.958Z"
---

A **sonic sootblower** is a [sonic horn](/glossary/sonic-horn) applied specifically to boiler heat-transfer surfaces — [economisers](/glossary/economiser), [superheaters](/glossary/superheater), [reheaters](/glossary/reheater), [air heaters](/glossary/air-heater) and convective-pass tube banks. The term carries over the "sootblower" lineage from the steam and air lances that historically performed this duty, but the cleaning mechanism is fundamentally different: a sonic sootblower uses pulsed low-frequency sound rather than a steam jet.

## Why the boiler-industry name persists

Operators and OEMs (Babcock & Wilcox, ANDRITZ, Valmet, Mitsubishi Heavy Industries) cataloguing boiler-cleaning hardware naturally classify any device that removes soot, ash and slag from convective surfaces as a "sootblower". When acoustic cleaners entered the boiler aftermarket in the 1980s, they were absorbed into that taxonomy as **sonic sootblowers** to make procurement, maintenance and BLRBAC documentation straightforward. The device itself is identical to a sonic horn used on any other application.

## Sonic sootblower vs steam sootblower

<table>
<thead>
  <tr>
    <th>
      Attribute
    </th>
    
    <th>
      Sonic sootblower
    </th>
    
    <th>
      <a href="/glossary/steam-sootblower">
        Steam sootblower
      </a>
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td>
      Cleaning medium
    </td>
    
    <td>
      Pulsed sound (60–400 Hz, 140–180 dB)
    </td>
    
    <td>
      Saturated or superheated steam jet
    </td>
  </tr>
  
  <tr>
    <td>
      Energy source
    </td>
    
    <td>
      Compressed air, 4–7 bar
    </td>
    
    <td>
      Boiler steam, typically 17–35 bar
    </td>
  </tr>
  
  <tr>
    <td>
      Moving parts in flue gas
    </td>
    
    <td>
      None
    </td>
    
    <td>
      Retractable lance + nozzle
    </td>
  </tr>
  
  <tr>
    <td>
      Tube erosion risk
    </td>
    
    <td>
      None
    </td>
    
    <td>
      Documented at lance tip and opposite tube row
    </td>
  </tr>
  
  <tr>
    <td>
      Typical firing interval
    </td>
    
    <td>
      Every 3–15 minutes
    </td>
    
    <td>
      Every shift or longer
    </td>
  </tr>
  
  <tr>
    <td>
      Best suited to
    </td>
    
    <td>
      Dry ash, dust, light-to-moderate fouling
    </td>
    
    <td>
      Hard slag, baked-on deposits
    </td>
  </tr>
</tbody>
</table>

The two technologies are increasingly specified together: sonic sootblowers handle the continuous, preventive duty across the convective pass, while a smaller fleet of steam retractables remains for furnace waterwalls and high-temperature finishing superheaters where slag bonds at temperatures sound alone cannot defeat.

## Applications

- [Kraft recovery boilers](/glossary/recovery-boiler) (superheaters, [generating banks](/glossary/generating-bank), economisers)
- [Coal-fired utility boilers](/glossary/pc-boiler) (economiser, [air preheater](/glossary/air-heater) cold end)
- [Biomass and waste-to-energy boilers](/glossary/waste-to-energy) (ash-rich, chloride-laden flue gas)
- [HRSGs in combined-cycle plants](/glossary/heat-recovery-steam-generator)
- [Industrial process boilers](/glossary/boiler) in refining, petrochemicals and chemicals

## Related terms

- [Sonic horn](/glossary/sonic-horn)
- [Steam sootblower](/glossary/steam-sootblower)
- [Acoustic cleaner](/glossary/acoustic-cleaner)
- [Economiser](/glossary/economiser)
- [Superheater](/glossary/superheater)