The countercurrent gas-solid-heat transfer during the drying of brown coal briquettes in the pilot carbonization plant at Morwell has been analysed and theoretical gas and solid temp- erature distributions through the drier have been calculated._x000D_
Although the calculations rest on several simplifying assump- tions, to be corrected as the experimental work develops, the theoretical temperature distributions compare well with those observed in practical operation. Valuable conclusions are reached as to the effects of changes in drier operating con- ditions on the rate of drying of the briquettes which-controls the 2 strength of the char produced. The analysis shows why a limitation was reached in the improvement of char-strength in the pilot plant in 1961 and a prediction is made of ' a way ' in ' which the limitation could be overcome.