What is Tangential Firing in Boilers ?

Tangential Firing in Boilers is a widely used method in the combustion of fuel, usually, coal.  This method ensures efficient firing of the fuel.  The Tangential Firing method also results in reduced emissions.

In this method, finely powdered coal is blown into the combustion chamber along with air through a series of burner nozzles.  As the coal and air mixture enters the combustion chamber four burners placed in the wall tangential to the fireball are used to fire the mixture.

The method gets its name as the flame from the burners strikes the burning fireball at a tangent.  The burning mass rotates ensuring complete combustion of the fuel particles.