Valmet’s well-proven Tubel design has been shown to provide greater availability in high dry solids or scaling applications.
In a Tubel evaporator, a falling film of liquor is evaporated on the outside of tubes heated by steam or vapor.
The open design eliminates the risk of plugging. And the large distance between the tubes minimizes the risk of bridging.
On-line washing is easy, thanks to the convex shape of the tube surface. Off-line washing, with hydroblasting, is normally never needed in kraft liquor applications.
The heating surface in Tubel Evaporators are manufactured in our own workshops with proven, automated manufacturing methods.
Tubes are mechanically reliable and give the heating surface superior strength and a longer service life. Valmet’s Tubel Evaporators are known for their outstanding reliability.
High pressure/high temperature steam can easily be used in a Tubel Evaporator. This can increase the evaporation capacity, or reduce the viscosity of the liquor at very high dry solids contents.
When space is limited, a Tubel Concentrator is normally designed with one shell divided into two or more sections. For best operating characteristics, steam and liquor circuits in the sections are controlled separately.
Tubel is the ideal solution for applications where scaling problems may arise and is therefore very suitable for concentrators. Moreover, the mechanical reliability of old plate-type units can be improved by replacing their heating surfaces with Tubel elements.
6-effect Valmet Evaporation Plant, capacity 1740 tons/h, 80 % DS. Tubel concentrator for highest availability and easy washing.
Complete new falling film evaporation train with excellent 9+-effect steam economy, integrated CTMP liquor evaporation and efficient condensate handling. Capacity: 580 tons of black liquor and 173 tons of CTMP liquor per hour, 80% DS product.