News

• 201111/11

  Rolling Bed Dryer Handles Green and Organic Waste

  The use of low temperature waste heat for drying becomes possible, which is available in abundance especially at many recycling companies and municipalities. In the Rolling Bed Dryer the non uniform bulk material is steadily and homogeneously mixed and stays in the dryer for long retention times in spite of the compact design of the dryer. Even very irregular shredded organic waste or unwieldy bulk like branches and tree cuttings, bark and leaves or unevenly cut wood chips is conveyed by the dryer in a very reliable way.

   

    Organic waste products, which in a dry state are usable as alternative fuel or can be transformed to charcoal for instance, normally have high initial moisture content and need very long residence times during drying. These are often non-uniform in shape and size, sometimes are contaminated, and in many cases are sensitive to heat, ignition, emit volatiles or generate explosive fines.

   

    For drying of green waste, the use of either rotary drum driers, belt driers or fluid bed driers has been state of the art. But all those types of dryers have significant disadvantages such as: insufficient product residence times, partial overheating of the solid, inability to use low temperature secondary heat, and poor solid mixing.

   

    The new Rolling Bed Dryer can produce new and alternative fuels from the preparation and drying of organic wastes such as wood chips and green waste - sometimes mixed with fruits or wine residues, sugar beet pulp or even horse manure, all in a safe, environmentally friendly and economical manner.