Title:
Retting Mill - The Efficient Machine for Disintegration of Wet Fibrous Biomass
Author(s):
Krátký, L., Setnička, A.
Document(s):
Paper
Poster
Abstract:
There is nowadays a problem to comminute wet fibrous biomass like agriculture and forestry wastes in biotechnologies. Colloid mills or extruders are used in these applications to disintegrate wet material, i.e. with a moisture over 20 % wt. The major disadvantage of these machines are high energy requirement, being in hundreds or thousands kWh per ton of dry mass, and milling in process cycles.There was therefore an effort to design a new type of grinder that is able to continually mill wet fibrous biomass under minimum energy demand.The new prototype of grinder was developed. Its grinding principle is based on roll-plate grind systemequipped with sharp-edged segments. The test experiments with wet wheat straw showed that energy demand to comminute particles from 200 mm to 10 mm was equal to 50 kWh·t-1 TS, all in continual mode of operation. The subsequent biogas test showed an increase in methane yield by 25 %. Based on energy-economic balance of the process, it was observed that the implementation of retting mill to currently-operating biogas plantsdecreases specific power for batch mixing by 70 %, increases its net profit by 14 %and simple payback time of size reduction technology with implemented retting mill to nowadays operating biogas plants is 5.6 years.
Keywords:
biomass, energy balance, industrial scale application, treatment, wheat straw, economical aspects
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Anaerobic digestion for biogas production
Event:
23rd European Biomass Conference and Exhibition
Session:
2DV.1.67
Pages:
873 - 878
ISBN:
978-88-89407-516
Paper DOI:
10.5071/23rdEUBCE2015-2DV.1.67
Price:
FREE
