Brochure

Black Liquor Guns
Black liquor from the evaporator set is introduced into the recovery boiler via liquor guns. These guns produce a spray that is combustible by
a hot flue gas. The spray is controlled by a valve that is subjected to corrosion due to high black liquor content. Additionally, this valve must
precisely control the black liquor flow as this can directly affect the recovery boiler’s burning and steam generation efficiency.
Lime Mud Underflow
Once lime mud is removed via the pressure filter, it is washed to remove any residual chemicals and sent to a settling tank. Here, the lime
mud settles to the bottom of the tank and exits via an underflow valve while the washing fluid, called weak wash, overflows from the top.
The underflow valve is throttled to control mud density, which directly impacts the operation and efficiency of the lime kiln. The valve must
be made of wear-resistant materials due to the extremely erosive nature of the fine particulate and high solids concentration.
Product Solutions
20 | Fisher
®
Pulp and Paper Solutions
Recovery
n EROSION CONTROL Specially designed valve body and trim combats the process of erosion.
n WEAR RESISTANCE Solid metal or Very Tough Ceramic (VTC) seat ring and valve plug for erosion resistance and
long service life.
n RUGGED CONSTRUCTION Sealed metal bearings help prevent particle buildup and valve shaft seizure in erosive
applications.
n TIGHT SHUTOFF Self-centering seat ring and rugged plug for tight shutoff and reduced internal wear.
n CORROSION CONTROL Alloy material options promote corrosion resistance and long service life.
n EASY INSTALLATION Centering holes and line ange bolts reduces valve centering issues for easy installation.
n POSITIONER FEEDBACK Linkage-less and non-contact feedback improves reliability in high vibration.
Fisher V500 control valve, 2052 actuator, and FIELDVUE DVC6200
Recovery