Alfa Laval Compabloc boosts capacity and cuts CO2 at Dow Wolff Cellulosics in Belgium
Dow Wolff Cellulosics, Belgium, has installed two Compabloc compact heat exchangers from Alfa Laval for different duties in one of the plant's solvent recovery columns. The first unit, required urgently to replace a worn-out shell-and-tube reboiler, was delivered by Alfa Laval at extremely short notice and provided a substantial capacity increase.
DATE 2023-11-28Concerned about the long delivery time for a customised shell-and-tube, Dow looked around for alternatives. The application is a challenging one since the product has an extremely high viscosity.
After consulting Alfa Laval, the company confirmed that a Compabloc compact plate heat exchanger was the answer. The heat transfer discipline of Dow process engineering was also convinced that a plate heat exchanger, when properly designed, would be a good alternative for a shell-and-tube – even in this critical application. Compabloc, an advanced, fully welded plate heat exchanger designed for heat recovery, condensation, reboiling and gas cooling, could be delivered on time and would handle the duty efficiently.
Big energy savings
Calculations show that the second Compabloc, installed to heat the process feed to the column, will provide annual energy savings of 22,400 GJ and a reduction in CO2 of 1,250 tonnes.
The company
Dow is a diversified chemical company with 46,000 employees worldwide, delivering a broad range of products and services. Located in Zwijndrecht, Belgium, Dow Wolff Cellulosics manufactures HEC (hydroxyethyl cellulose) under the brand name CELLOSIZE™, which is primarily used as a paint thickener.
Download the full story
Schimbătorul de căldură compact, complet sudat Compabloc este proiectat să funcționeze cu o gamă largă de medii agresive și la temperaturi și presiuni ridicate.
Date cheie
- Temperatura de proiectare: 400°C, până la -100°C
- Presiunea de proiectare: De la vid complet la 42 barg
- Suprafață maximă de transfer de căldură: 840 m2
- Material de construcție: 316L, SMO254, 904L, titan, C-276 / C-22 / C-2000 K"
Sarcini
Recuperarea căldurii, răcirea, încălzirea, condensarea, condensarea parțială, fierberea, evaporarea și răcirea cu gaz.
A fost minunat să putem utiliza un nou reboiler într-un termen atât de scurt. Dar acesta nu a fost motivul nostru principal pentru instalarea unui Compabloc. Nu am fi ales această tehnologie dacă nu am fi crezut în ea.
Managerul de proiect al Dow, Raf Croux