Abstract
A method for the simultaneous determination of calorific value Qr, ash yieldAr and total water content Wrt of soft brown coals is described. The method involves instrumental analysis of brown coal samples using neutron thermalization and gamma back-scattering techniques. Over 80 coal samples (1.1 kg) were analysed, having Qrvalues up to 15.5 MJ kg−1,Ar ranging from 3.6 to 76.1 wt% and Wrt ranging from 11.4 to 61.7 wt%. A comparison of the results from the instrumental method with those of standard laboratory analyses is given, followed by a discussion of the accuracy of the method and of possible ways for improving it.
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