Video shows energy-saving pelletizing/crystallizing system at Lotte’s PET plant

  • Significant energy cost savings by combining pelletizing and crystallizing into a single process
  • BKG CrystallCut system in operation
  • Animation shows how screen packs of Poly Screen Changer are replaced

A new on-site video shows how melt filtration and pelletizing technologies from Nordson Corporation works at the 600 ton per day PET resin plant of Lotte Chemical UK Ltd.

Energy-saving BKG CrystallCut System in operation

Commissioned late in 2014, the world-scale plant at Lotte Chemical’s Redcar, England facility includes three pelletizing / crystallizing units based on Nordson’s patented BKG CrystallCut process, which saves energy by retaining heat from the molten polymer and using it for crystallization. The installation also includes a Nordson Kreyenborg POLY screen changer, whose quick-change operation makes possible filter screen replacement while maintaining continuous production.

Pellets rapidly transported from cutter face through hot water directly into centrifugal dryer

Conventionally, PET pellets are cooled after pelletizing, then reheated for crystallization. The video shows how the CrystallCut process eliminates cooling by rapidly transporting pellets from the cutter face of the die through hot water and directly into a centrifugal dryer. The pellets exit the dryer at a temperature of 140 to 150 °C. and are uniformly crystallized.

Millions of Euros per year can be saved

“For a modern, world-scale PET plant operating ‘24/7,’ we estimate that the CrystallCut system can save millions of Euros per year in energy costs by combining pelletizing and crystallizing into a single integrated process without a cooling step,” said Ralf Simon, Nordson BKG managing director. “And because the retained heat causes pellets to crystallize from the inside out, the result is an improved crystalline structure that requires less energy for re-melting.”

Animation shows how screen packs are replaced

The new video also includes an animation showing how screen packs are replaced in the patented Kreyenborg Poly melt filtration system. There are four pairs of screen packs mounted on two movable pistons, with two pairs side-by-side on each piston. As one pair is disengaged from the process for screen replacement, melt filtration continues in the other three, i.e. it is possible to replace screen packs without any system shutdown.

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