Abstract
The effects of coal preheating on the quality, textural and surface properties of the coke were assessed in comparison with the conventional wet charging system using a Spanish hvb coal. Coal was flash dried and preheated in a 2 t h − 1 Precarbon pilot plant. Carbonization tests on the wet and preheated coals were carried out in a semi-industrial scale oven of 6 tonne capacity. Because textural and surface properties have an important effect on coke quality, an exhaustive characterization of the resultant cokes was made. Cokes were characterized by using microscopic image analysis, mercury porosimetry, density measurements, optical and scanning electron microscopy (SEM) of surfaces. Mechanical strength and reactivity towards CO 2 were also studied. Surface areas were determined by N 2 adsorption at 77 K using the Brunauer-Emmett-Teller (BET) equation and CO 2 adsorption at 273 K. using the Dubinin-Radushkevich (DR) equation. Coal preheating improved coke mechanical strength considerably but at the same time increased the reactivity of the cokes. The higher reactivity could be due to the increase in microporosity and CO 2 surface area.
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