ON-LINE Dry Chemical Cleaning of Steam Boilers

“On-The-Run” Dry Chemical Cleaning

SENTRO TECHNOLOGIES USA, LLC specializes in furnaces and heaters dry chemical cleaning during normal operating conditions.

There is no need to shut down the equipment, production continues normally.

The cleaning process applied on the external tube surface of both radiant and convection tubes (fireside).

We also dry-clean air preheating system, economizer, and other types of process equipment.


A Process of Chemistry & Physics

Cleaning is done by a combination of mechanical effect and chemical effect – simultaneously.

The mechanical effect is non-aggressive abrasion over the tube surface, without damaging the surface, fins, or refractory.

The chemical effect is a neutralization reaction between alkaline SENTROMAX™ chemicals and the acidic scale, hot spots (usually sulfuric), and fouling deposits.

This innovative dry cleaning process is safe, environmental-friendly, and cost-effective.


We anticipate that the SENTROMAX™ On-Line Dry Chemical Cleaning of Steam Boilers will deliver the following benefits and results:

  1. Cleaning is performed On-Line during normal operating conditions of the unit, there is no need to shut it down.

  2. Removal of scale and fouling from external tube surface, Radiant and Convection tubes, thereby increasing thermal efficiency (heat transfer). As a result, reducing operating energy consumption and increasing production rate.

  3. No Scaffolding required.

  4. No water, no water treatment.

  5. No dry-Ice (no thermal shock to tubes, especially to cast iron tube-supports)

  6. No foam or soap (no caustic stress corrosion cracking)

  7. No clean-up or disposal requirements

  8. No harmful chemicals (no negative environmental impact)

  9. No damage to tubes, fins, refractory, instrumentation.

  10. No confined space entry

Major Benefits:

  • Immediate increase in boiler thermal efficiency

  •  Immediate increase of throughput/production

  •  Energy-saving by reduced fuel consumption

  •  Reduced emission/pollution

  •  Reduce the flue gas temperature profile of the boiler 

  •  Pre-shut down activity – saves time and costs

  •  Saves maintenance activities (such as: scaffolding, sand blasting, water blasting etc..)

  • TOTAL THERMAL EFFICIENCY of the boiler can be increased by 2-10%

Our On-Line Cleaning Process is SAFE and Environmental Friendly

  • Developed over years of R&D and field  experience

  • Chemicals are Non-toxic, Non-hazardous, Non-corrosive, Non-poisonous, Non-flammable, Non-explosive, Non-transport regulated

  • No damage to metallurgy, electrical motors, and instrumentation

  • Chemicals completely dispersed, appear like steam

  • Chemicals are compatible with all types of air coolers metallurgy

Typical view of the internal wall through the boiler peep-hole

“Air-Screen” or “Air Curtain” system, to create local negative pressure near the window when the boiler is operated under positive pressure. 

Fouled boiler tubes (outside the boiler)

SENTRO On-Line dry chemical cleaning in action

Cleaning results 

Before: slagging on and between the tubes

After: no slagging

SENTROMAX dry chemicals are non-hazmat, non-toxic, not regulated for transport  








SENTRO Setup Near the Furnace: Equipment, Chemicals, Air Compressor and Hoses

Note that our footprint is compact and easily moveable between units.

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