Brochure

The change of weak black liquor to strong black liquor via an evaporation plant allows black liquor to be burned as fuel in the recovery boiler
and serves as the major application in the recovery cycle of the paper mill. The main purpose of the evaporation plant is to increase the dry
solids content of the black liquor by evaporating water until reaching a concentration suitable to allow burning in the recovery boiler. With
the help of a concentrator, black liquor is 65-80% solids after leaving the evaporation plant.
An evaporation plant usually consists of several heat transfer units connected in a series. A valve in this environment is subjected to scaling
due to thick media, and must perform in both a traditional throttling and on/off application.
Black Liquor Evaporation
Green Liquor Dissolving Tank Density
Molten smelt from the recovery boiler flows by gravity to the dissolving tank. Here, it is mixed with weak wash to a solution suitable for
pumping known as green liquor. Two valves in parallel control the density of the dissolving tank.
Green liquor has a tendency to scale, and can bind the internals of the control valve body.
Product Solutions
18 | Fisher
®
Pulp and Paper Solutions
Recovery
n MAXIMUM FLOW CONTROL V-notch ball contouring provides modied equal percent characteristic.
n ZERO LOST MOTION Splined driveshaft and shaft to ball pinning allows for tight control.
n EXTENDED SERVICE LIFE Heavy duty seal and rugged bearing design are robustly designed for extended service.
n EASE OF MAINTENANCE Bearings provide optimal control and drop-in for easy maintenance.
n REDUCED MAINTENANCE Flanged valve body reduces alignment and installation time.
n SMALL ACTUATOR PROFILE Actuator design promotes smaller envelope package size for tight spaces.
n POSITIONER FEEDBACK Linkage-less and non-contact feedback improves reliability in high vibration.
Fisher V150 Vee-Ball control valve, 2052 actuator, and FIELDVUE DVC6200
Recovery