The Potential for a Pellet Plant to Become a Biorefinery

• Main Authors: Stefan Frodeson, Jonas Berghel, Magnus Ståhl, Karin Granström, Carl Romlin, Alexander Thelander
• Format: Article
• Language: English
• Published: MDPI AG 2019-04-01
• Series: Processes
• Subjects: energy efficiency; wood pellet production; drying; biorefinery; bioplastics; mechanical dewatering
• Online Access: https://www.mdpi.com/2227-9717/7/4/233

The use of bioenergy has increased globally in recent years, as has the utilization of biomaterials for various new product solutions through various biorefinery concepts. In this study, we introduce the concept of using a mechanical dewatering press in combination with thermal drying in a pellet plant. The purpose of the study is to increase the understanding of the effects a mechanical dewatering press has in a pellet production chain and investigate whether a pellet plant could thus become a biorefinery. The evaluations in this study are based on industrial data and initial tests at the university. The results show that the concept of using the mechanical dewatering press together with a packed moving bed dryer reduces energy use by 50%, compared to using only a packed moving bed dryer. The press water could be used as a raw material for biogas, bioplastics, and biohydrogen. Hence, this study points out the possibilities of a pellet plant increasing the efficiency of the drying step, while moving towards becoming a biorefinery.