Abstract
AbstractThe pyrolysis of Loy Yang coal was investigated under rapid heating conditions in a fluidised bed with a feed rate of 10g/h. Nitrogen was used as the fluidising gas operating at fives times the minimum fluidising velocity. The yields of tar, total volatile matter and C1‐C3 hydrocarbons are obtained for pyrolysis temperatures between 300 to 600°C. A maximum tar yield of 24.3% w/w (dry ash‐free coal) was achieved at 550°C and 1.82 s gas residence time. Fourteen fractions were identified in the tar dissolved in methanol. Yields of C1‐C3 hydrocarbons increased with increasing temperature to 3% w/w at 600°C. Elemental analysis showed that the composition of char and the tar yields were strongly dependent on temperature. The effects of gas residence time and feed particle size were also investigated.
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