5102 Drying and fractionation of fibre reject with the Tornado technique

To address the growing need of economically viable sludge processing technologies and respective resource recovery, this project was set-up to investigate the drying potential of the Tornado technique in the context of pulp and paper industry sludge materials.

The novel pilot set-up at the Biofuel Technology Centre (BTC) at the Swedish University of Agricultural Sciences in Umeå, Sweden was used for conducting the experiments. A fibre reject stream from SCA Obbola AB was chosen for this first experimental period. The objective was to produce reliable pilot-scale data to allow modelling of:

(i) dry solids content (%) of processed sludge as a function of process parameters, and;

(ii) specific energy consumption (kWh kg-1 H2O) of drying as function of process parameters.

The attainable dry solids content of processed sludge and respective specific energy consumption of drying were successfully modeled indicating the significance of inlet air heating for energy efficient drying. Efficient drying, i.e. ?1-1.2 kWh kg-1 H2O based on the electricity consumption of the fan motor, was however achieved with inlet air temperature levels ?40 °C.

SLU, Airgrinder, SCA
Liselotte Uhlir
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2013-06
2014-01
Products from Residual Streams, Energy


RISE Processum AB
Box 70, 891 22 Örnsköldsvik
Tel: 010-516 67 50
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