Title:
Pressure Resistance During Ventilation of Different Types of Wood Chips as a Function of Particle Size and Particle Form
Author(s):
Kuptz, D., Turowski, P., Hartmann, H.
Document(s):
Paper
Slide presentation
Abstract:
Pressure resistance during ventilation was measured for a high variety of wood chips (n = 95). Samples were produced using different raw materials and chipper settings. Physical fuel properties were analyzed according to European standards (bulk density, particle size distribution) but also by using a continuously measuring image analysis device (particle length, particle form). Pressure resistance (Pa m-1) was measured within a custom build flow cylinder (2 m height, 0.4 m³ filling volume) and was related to volumetric flow rate. Four common models to describe pressure resistance were compared (Ramsin, Shedd, Hukill & Ives, Ergun). For all samples, pressure resistance increased exponentially with volumetric flow rate. Thereby, pressure resistance was highly variable, ranging from 11 to 190 Pa m-1 at 0.1 m s-1 and from 213 to 1240 Pa m-1 at 0.5 m s-1. A mathematical model based on multiple linear regression analysis was created to express pressure resistance as a function of several fuel parameters. It indicates that pressure resistance strongly depends on particle size and particle form, as these factors influence the number, size and shape of air voids within wood chip piles. A simplified model version provides applicability of the results for the wood chip producing industry.
Keywords:
drying, quality, wood chips, ventilation, pressure resistance
Topic:
R&D on Processes for Solid, Liquid and Gaseous Fuels from Biomass
Subtopic:
Production and supply of solid biofuels
Event:
21st European Biomass Conference and Exhibition
Session:
3DO.2.3
Pages:
1355 - 1361
ISBN:
978-88-89407-53-0
Paper DOI:
10.5071/21stEUBCE2013-3DO.2.3
Price:
FREE
