Abstract
A process for the pyrolysis under vacuum of biomass and waste materials has been under development since 1978 in Canada. Background data regarding the yields and qualities of the pyrolysis products derived from materials such as wood, bark, agricultural residues, peat, municipal solid wastes, activated sludges and scrap tires, have been obtained at the bench scale level. A Process Development Unit having a feedthrough capacity of up to 25 kg h -1 and using a multiple-hearth furnace reactor has been designed and built. The objectives of the P.D.U. was twofold. First, the unit was used to determine engineering data such as the overall thermal efficiency and the heat requirement for the reactions. Secondly, the configuration and mechanical operation of the ractor had to be tested before its scale-up for the pilot plant phase of the project. This paper reports on the role of several process parameters which are key factors to be considered for the design of a biomass vacuum pyrolysis unit.
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