Better Control of the Flue Gas Temperature out of the Boiler

A high flue gas temperature out of the boiler is an strain on the flue gas cleaning system that should be avoided.

Too high temperature is caused by residues accumulating at the surface of the boiler (either on the radiation parts or the convection ones), creating an isolation lining and having a double consequence: a lesser steam/energy production, and a higher flue gas temperature.

Dublix Engineering’s solutions to such problem are:

• Cooling water spray mixed in the secondary air jet from the furnace roof nozzles to use as an emergency tool to control the furnace temperature when it tends to run too high in spite of the traditional control measures
• DD-Jet boiler cleaning system
• FuzEvent High-Level control system
• Mechanical check-up of the convection parts cleaning system
• A dynamite based cleaning of the convection part of the boiler, in association with Onlines Services

The achieved results are:

• Optimization of 2 seconds retention time above 850°C
• Better operation of boiler and flue gas cleaning due to better flue gas temperature control
• Flue gas temperature at boiler outlet reduced with 80 to 120°C
• Better cleaned convection parts of the boiler making it more efficient
• Less stress on the induced draft fan