Abstract
In order to develop a process for the production of a coal-water slurry fuel with a high solids concentration, a novel process, elevated-temperature mechanical expression, has been proposed, and the fundamentals of the process for mechanically dewatering Hydrothermally Dewatered (HTD) brown coal slurry have been investigated. Batch tests have been carried out using a compression-permeability cell to study the pore destruction and dewatering characteristics of HTD coal slurry over a wide range of process-related variables such as applied pressure, temperature, and expression rate. A significant improvement in the pore destruction and moisture reduction of HTD coal slurry has been realised by using elevated-temperature expression. The solids concentration of compressed pellets can be as high as 80 wt%. The pressure required in the elevated-temperature expression is much lower than in a traditional mechanical expression. Therefore, elevated-temperature expression could potentially be an effective dewatering technique for brown coal.
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