There are 3 main factors that influence slagging in a boiler: Boiler design, coal properties and oxygen level of the combustion. Typically the operator has little influence on all 3 of them. The boiler design cannot be changed, coal properties are subject to the price politics of the enterprise and the choice of operating parameters like excess air is limited due to technical constraints.
PentoMag 2550 somehow eases the pressure on the operator, as it increases the bandwith of operation in the boiler.
There are 2 main working mechanisms:
- Increase fusion temperature of metals contained in the ash.
Slags start to accumulate if the ash is in molten form. Once the process starts, it gets worse and worse due to the reduced heat transfer from gas to steam. By increasing the melting point of metal oxides in the ash, the ash remains dry and cannot stick to the walls.
- Change the structure of deposits.
PentoMag 2550 changes the amorphous structure of the deposits to a crystalline structure. The advantage is a reduced density and friability of these deposits.