Alrec Recovery boiler for BCTMP process
Alrec® recovery boiler has been in operation at M-real BCTMP mill in Kaskinen Finland since spring 2009. The name Alrec® stands for alkali recovery.
The Alrec® boiler generates steam using the concentrated BCTMP liquor at 75 % DS as fuel. The sodium is recovered from the smelt and ash in the form of 15 % sodium carbonate solution. Part of the recovered sodium carbonate solution is utilized in the impregnation and bleaching.
The combustion takes place in a cooled combustion chamber in an oxidative atmosphere. An autogenic insulation is formed on the walls of the combustion chamber help to reach high enough combustion temperature. Once heated up, the combustion goes on without support flame.
Benefits
- Sodium recovery in the form of sodium carbonate solution
- Dissolved organic material is converted into steam, which can be used for pulp drying
- Small and clean effluents
Key features
- Oxidative combustion
- Steam parameters according to customer needs
Options
- Steam superheating available
