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Mechanical thermal expression (MTE) is a pressure dewatering process, which is carried out at elevated temperatures. The process is being investigated as a means of lowering greenhouse gas emissions from existing lignite fired power stations by reducing the moisture content of lignites. The investigation was carried out to identify how variations in temperature and pressure during the MTE process...
Sugar cane bagasse and cane trash were pyrolysed in a novel quartz fluidised-bed/fixed-bed reactor. Quantification of the Na, K, Mg and Ca in chars revealed that pyrolysis temperature, heating rate, valence and biomass type were important factors influencing the volatilisation of these alkali and alkaline earth metallic (AAEM) species. Pyrolysis at a slow heating rate (∼10Kmin −1 ) led to...
A novel method of producing a product of low intra-particle porosity (<1μm pore radius) from highly porous Latrobe Valley raw brown coals uses a combination of hydrothermal and evaporative drying. Low porosity coal was made in three different batch autoclave systems at 320 o C for residence times as low as 10min. Higher temperatures (up to 350 o C) increased porosity slightly but...
A range of lower rank coals from Australia, Indonesia, and the USA have been dried under hydrothermal dewatering conditions at 320 o C for 30min in a 500ml autoclave using a 1:3 dry coal/water mixture. The hydrothermally dewatered (HTD) products were characterised by elemental analysis (both organic and inorganic components), volatile matter determinations, moisture holding capacity, calorific...
The hydrothermal dewatering of a Loy Yang Low Ash Victorian brown coal has been studied under a wide range of process conditions. The intra-particle porosity (<1μm pore radius) determined by mercury porosimetry of the resulting dried products, a proxy for the maximum solids concentration of coal-water slurries, is reported as a function of reaction time, processing temperature, autoclave size and...
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