Evaporation
Evaporator Modifications and Optimization
A.H. Lundberg Systems specializes in modifying existing evaporator systems. Modifications are pursued to increase capacity, improve economy, increase run time between cleaning, and reduce liquor carry over. We have expertise to optimize all technologies including falling film, flooded forced circulation, LTV, and plate type units.
Evaporator Mist Elimination
Increasing flow to an evaporator system beyond its design capacity generally results in increased carry-over of salts or liquor into the vapour stream, resulting in chemical losses and expensive condensate remediation costs.
A.H. Lundberg can retrofit high efficiency mist eliminators into existing vapour bustles of a falling film evaporator body with no impact on evaporator economy or liquor throughput.
Condensate Segregation
Condensate segregation concentrates volatile organic compounds (VOC) and Total Reduced Sulphur (TRS) into a smaller fraction of the condensate, minimizing the mass flow of foul condensate to the effluent treatment system while maximizing the recapture of clean process condensates for re-use within the mill.
There are two methods used: two-stage condensing (the most effective method), and flash distillation. Two-stage condensation requires that a vapour be condensed in series on two distinct surfaces, in one body or in two separate vessels. Flash distillation results in the more volatile VOC and TRS components being concentrated in the vapour phase.
Enhanced Heat Transfer
Where appropriate, A.H. Lundberg Systems' flooded forced circulation concentrators and heavy liquor heaters are offered with the Reynolds Enhanced Heat Transfer (REX) technology. REX technology involves installing spiral inserts within each tube of the heat exchanger, creating a swirl to the liquor even at lower velocities, increasing fluid shear at the tube wall and increasing heat transfer rate.
Reduction in horsepower consumption by as much as 45% over conventional technology has been realized. Additional benefits include improvements to fouling and scaling resistance.