Article

Energy Efficiency

, Volume 4, Issue 2, pp 223-233

Open Access This content is freely available online to anyone, anywhere at any time.

Reducing drying energy and costs by process alterations at aggregate stockpiles

  • Geert Jan ThijssenAffiliated withDepartment of Marine and Transport Technology, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology
  • , Dingena L. SchottAffiliated withDepartment of Marine and Transport Technology, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology Email author 
  • , Ernst W. DemminkAffiliated withBAM Wegen
  • , Gabriel LodewijksAffiliated withDepartment of Marine and Transport Technology, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology

Abstract

In the field of bulk solids, handling knowledge on moisture behaviour in aggregate stockpiles can be useful for process optimisation in terms of energy consumption. In the asphalt industry, an increase in moisture content leads to a significant increase in energy consumption. To determine the characteristics of moisture behaviour, correlations are investigated between theory on soil–water movements and moisture in aggregates. With column drainage experiments with porous bottom, similarities between theory and practice are found. This allows the use of theoretical hydrologic models to determine and predict the moisture behaviour in drained piles. The effect of process alterations within the system of piles on energy consumption was investigated, and a significant reduction of energy consumption was found.

Keywords

Energy savings Loss prevention Aggregates Asphalt production Stockpiles Moisture behaviour