A. Heat exchanger, Super-heat exchanger
Already for decades heat recovery mechanisms and also systems for saving electrical power belong to the recognized rules of the technology (see also compound system).
Only due to the high additional capital outlays of approx.10 to 80% one could not implement such energy saving techniques so far to the conventional drying process of wood - or to other fields. This picture changes lately obviousley due to the high prices for electrical power and heat energy. Such auxiliary investments can be justified only with high savings of energy costs, because the interest charges of the multi-capital which will be spent must enter economic calculations also.
Thus our more than 10 years ago presented compound system (with several kilns) and the well-known roof systems for heat recovery as well as our new turbo-unit becomes interesting if you look at the total cost per m³ . Only a professional energy and capital calculation - co-ordinated with the operational parameters such as costs of heating and/or electricity as well as timber species/dimensions can result in a decission for this multi-investment.
The turbo-unit unites several components, which can bring the conventional standard dryer to a higher level of efficiency:
- Increased heat exchanger surfaces mean less pressure loss for the fans and thus you can already save up to 30% electricity
- A very big dimensioned condenser on the roof of the kiln (additional fan and complex actions for keeping the efficieny are necessary, e.g. preventing resin deposits, incrustation, sticking with wood dust particles, corrosion...) extracts a majority of the humidity from the normally wasted exhaust air, so that it can be used again with a higher temperature level instead of cold fresh air.
Fresh and exhaust air venting is reduced to a minimum. That saves heating energy, however additional electricity is necessary.
This process is only permissible for thinner soft wood boards. With big soft wood dimensions as well as with all hardwood species this “artificial”, very dry air leads to surface cracks and even collapse.
- For getting this unnatural dry climate you need more than just the sourrounding air as a cooling medium. Additional measures (e.g. cooling water) are necessary.
- The very dry "artificial air" can absorb more moisture and thus drying with lower temperatures than usual is possible. That leads to less fan power and less working hours and thus to a total saving of electric energy.
B. Larger fans, special heat exchangers
booster coils (for trolley loading)
During the drying process of thin softwood, further measures can be usefull in the hard- and software range. Their employment requires an exact economical review
back to previous page
|
