Pyrolysis of ground beech wood in irregular heating rate conditions

In this study, pyrolysis process of beech wood was carried out a horizontal cylindrical reactor of stainless-steel, 127.0 mm height, 17.0 mm inner diameter and 25.0 mm outer diameter inserted vertically into an electrically heated tubular furnace in the absence of oxygen in irregular heating rate conditions. The increases of the pyrolysis temperatures with time of pyrolysis are considerably irregular in the reaction conditions. From 60 s to 90 s period, the average heating rate is higher than 6 K/s for the samples with -0.063 mm, +0.060 mm and +0.150 mm. The average increase of temperature is slow from 170 s to 350 s period. The increase of temperature is highly regular in 450600 s periods. The completion time of pyrolysis decreases from -0.063 turn to +0.150 mm and then it increases with increasing size of particle. The lowest completion time and completion temperature for a +0.150 mm particle size is 445 s and 670 K, respectively, in the reaction conditions. The increases of liquid yields are considerably sharply for all of the samples in 90-170 s periods. (c) 2004 Elsevier B.V. All rights reserved.