Firing systems

Burn a wide range of fuels, reduce your emission levels and maintain exceptional availability and reliability levels with Alstom’s firing systems 

Why choose Alstom’s firing systems?

We are global leaders in supplying firing systems for utility boilers, with key technologies designed for maximum burning efficiency.

We develop utility-scale firing systems, including the:

  • Tangential firing system
  • Integrated lignite T-firing system
  • Fluidised bed firing system

Tangential firing system

Alstom introduced tangential firing systems to the power generation industry. Today, our systems lead the market in reducing emissions.

How does it work?

A rotating flame envelope is formed within the furnace, directing heat to each wall, regardless of unit load of fuel input combinations. The furnace aerodynamic helps with heat absorption and achieves lower bulk gas temperatures compared to wall-fired boilers. 

See the flame envelope in action in this short video.


Furnace heat absorption is regulated for steam temperature control through the automatic tilting up and down of the fuel and air nozzle assemblies. Superheat and reheat temperatures are controlled with minimal impact on the heat rate.

What does this mean? 

  • Thorough mixing within the furnace, providing complete combustion and uniform heat distribution
  • High combustion efficiency
  • Consistent thermal performance
  • Low emissions

Integrated lignite T-firing system

How does it work?
First we integrate the firing system, furnace design and milling system – a proven approach that has been widely successful. To combat high moisture in brown coals, we build beater wheel mills and a high temperature drying medium, supplied by recirculating hot furnace flue gas.

Burning low quality fuel creates a need for flame stability and minimised slagging and emissions. To tackle these challenges, we include substoichiometric operating regimes at the burner levels and subsequent air staging. 

What does this mean? 

  • Minimised NOx formation
  • Complete integration between firing system, furnace and mill
  • Brown coal moisture reduction
  • Consistent flame stability
  • Reduced emissions and slagging

Fluidised bed firing system

How does it work?
This system uses a bed of hot, non-combustible solids suspended in an upward flow of air to blaze difficult-to-burn fuels. Fuel residence time is longer in a fluidised bed than in suspension firing, as unburned fuel is captured and recirculated for ongoing combustion.

What does this mean? 

  • Improved environmental impacts
  • Control SO2 and NOx emissions without the use of extra pollution control equipment
  • Low combustion temperature
  • Cost efficiency through use of recirculated fuel combustion