A Coal Water Slurry (CWS) containing about 65-70% solids by weight can be defined as a stable combustible mixture having a high heat power, in spite of the presence of water. A suitable particle size distribution accompanied by a small quantity of additives contribute to the obtainment of such properties enabling handling, trasportation, storage and combustion as a heavy fuel oil. The utilization of CWS offers a number of economic and environmental advantages concerning either the transport and storage operations (better management of coal stockpiles, lower intensity of traffic ….) and the final combustion (CWS can be the starting phase for the application of a number of clean coal technologies including gasification and hydrogen production) Aim of the research work dealt with in the paper is the study of the influence on suspension stability and rheologic characteristics (viscosity, thyxotropy) of various parameters such as: • Particle size distribution • Type and dosage of a fluidising additive • Type and dosage of a stabilising agent • Proportion of coal in the mixture. Optimum CWS should be characterised by a high heat value, good stability and a viscosity low enough for pipeline delivery. Results obtained through a systematic experimental programme, while confirming a better aptness of high.rank coals, have shown that also the sub-bitominous coal mined in the Sulcis coalfield is amenable to the preparation of CWS to be burned in the nearby power stations.
Suitability of the Sulcis Coal for CWS Preparation
TILOCCA, MARIA CATERINA;
2010-01-01
Abstract
A Coal Water Slurry (CWS) containing about 65-70% solids by weight can be defined as a stable combustible mixture having a high heat power, in spite of the presence of water. A suitable particle size distribution accompanied by a small quantity of additives contribute to the obtainment of such properties enabling handling, trasportation, storage and combustion as a heavy fuel oil. The utilization of CWS offers a number of economic and environmental advantages concerning either the transport and storage operations (better management of coal stockpiles, lower intensity of traffic ….) and the final combustion (CWS can be the starting phase for the application of a number of clean coal technologies including gasification and hydrogen production) Aim of the research work dealt with in the paper is the study of the influence on suspension stability and rheologic characteristics (viscosity, thyxotropy) of various parameters such as: • Particle size distribution • Type and dosage of a fluidising additive • Type and dosage of a stabilising agent • Proportion of coal in the mixture. Optimum CWS should be characterised by a high heat value, good stability and a viscosity low enough for pipeline delivery. Results obtained through a systematic experimental programme, while confirming a better aptness of high.rank coals, have shown that also the sub-bitominous coal mined in the Sulcis coalfield is amenable to the preparation of CWS to be burned in the nearby power stations.
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