Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO₂ gasification process

Abstract

The dry deshaling process using the FGX method is a modern technique of coal quality enhancing without the use of water. The positive effect of this operation is the increase of calorific value and the removal of contaminants such as sulphur, chlorine, mercury and other heavy metals along with the separated gangue. However, elements such as sodium, potassium or calcium, considered as catalysts in the gasification process, are also partially removed. Consequently, the global effect of the dry deshaling on coal reactivity, being a key parameter determining its suitability for the gasification, is hard to predict. This study aims to determine the impact of dry deshaling of coal by FGX separator on its reactivity. Using TG analysis, 10 samples of coals from Polish mines, before and after the dry deshaling at commercially working FGX separator, were gasified in CO 2 atmosphere under non-isothermal conditions. The effect of deshaling on the basic properties of coals, ash composition and the content of contaminants such as sulphur and mercury, was also determined. The results showed slightly lower reactivity of clean coals. The values of kinetic parameters of gasification reaction were similar, or an increase in the activation energy value was compensated by the higher value of the pre-exponential factor. The basic properties of coals and the content of sulphur and mercury have changed after the deshaling process, and the magnitude of these changes differed significantly among the samples analysed. The changes in the ash composition were insignificant. These results suggest that FGX technology may be an attractive way of coal preparing for the gasification, resulting in a reduction of byproducts and contaminants without adverse effect on coals reactivity. K E Y W O R D S CO 2 gasification, coal, dry deshaling, non-isothermal TGA, upgrading of coal 1 | INTRODUCTION So as to allow efficient and ecological conversion of this fossil fuel, coal can be gasified. 1 Before thermochemical use, however, coal is directed to processing processes aimed at reducing ash content and increasing heating value, this being the first stage of applying Clean Coal Technologies. One such method of coal preparation is the

Studies on the Thermochemical Conversion of Waste Tyre Rubber—A Review

“…In turn, the value of the fixed carbon, combined with the ash content, makes it possible to estimate the amount of the solid product-tyre char (up to 50%) formed during the pyrolysis process. It is noteworthy that the varying oxygen content (from 0.8 to as much as 15.5%) can affect the reactivity of rubber waste, including in catalytic processes, especially with alkali metals and alkaline earth metals, through the formation of active sites for interaction with oxygen-containing functional groups like -OH and -COOH [76]. The unfavourable sulphur content of tyres varies from 1.1 to 2.3% and comes mainly from vulcanisation additives [29,47].…”