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Energy aspects of wood drying.

Energatski aspekti sušenja drveta.

Author(s) : MAROVIC V., ÐAKOVIC D.

Summary

Today, wood is primary energy source for more than two billion people in the world. In total primary energy, share of wood is over 14 %. In year of 2010 wood production was over 4 billion cubic meters, of which around 60 % was used to produce energy. In Republic of Montenegro in the year of 2011, around 730 000 cubic meters of firewood was consumed, and overall annual potential for wood biomass collected from forests has been estimated to over one million cubic meters per year. Whether wood is used to produce energy, or to build some finished product, it has to be dried to some value of moisture content. Type and quality of finished product determine maximal moisture content allowed in wood used as raw material for further manufacturing processes. If wood is to be used as firewood or to serve for bio-mass production, there are also requirements concerning maximal allowed moisture content in order to make combustion process energy efficient. Besides seasoning by natural air drying (which is unpredictable, can be very slow and can’t achieve values of moisture content below some point), wood drying is energy demanding process. Most of industrial wood drying today is carried out in wood drying kilns. It is shown in this manuscript that great quantity of heat is required in order to evaporate moisture from wood. Considerable amount of energy is required to power circulating fans. There are many types of kilns used for wood drying. In this manuscript emphasis is on conventional kilns and kilns that use heat pump to produce heat and separate moisture from drying air. Main purpose of this manuscript is to compare these two types of kilns from technical and economy aspects. It is obvious that heat pump system is more energy efficient in comparison with conventional kiln, but there is a question of initial costs of the equipment and investment payback period. This manuscript provides detailed analysis of these issues on the example of drying chosen type of deciduous and also of conifer.

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Pages: 12 p.

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Details

  • Original title: Energatski aspekti sušenja drveta.
  • Record ID : 30020243
  • Languages: English
  • Source: 47th International HVAC&R Congress and Exhibition.
  • Publication date: 2016/12

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