褐炭の記載岩石学上の特徴が水蒸気雰囲気下の乾燥特性に及ぼす影響調査のための実験的試み

抄録

Lignite drying technology has a great potential of improving thermal efficiency of a lignite-fired power plant by recovering both of latent heat of vaporization of water kept in the fuel. However, the optimal design of the dryer requires the fundamental knowledge of drying characteristics in respect to the individual properties of the utilized fuel. Experimental investigation to determine the correlation between a specific coal properties originated from geological background and its drying characteristics is thus the major concern in this paper. Experimental attempts unveiling drying kinetics were carried out for spherical samples in the superheated steam atmosphere. Simultaneous and continuous measurements of changes in weight, surface and interior temperatures and appearance on each tested sample were carried out for describing drying behavior. Analytical investigation was applied to explain the drying characteristics, which are strongly affected by the individual properties of coal structure and their high ash concentration due to sedminentation.