Cracking reactions of tar from pyrolysis of spruce wood

✍ Scribed by Johannes Rath; Gernot Staudinger

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 677 KB
• Volume: 80
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/s0016-2361(01)00016-3

✦ Synopsis

In order to investigate vapour phase cracking of tar from pyrolysis of spruce wood, experiments with small particles of spruce wood (0.5± 1.0 mm) were carried out both in a thermogravimetric analyser (TGA) and in a coupling of the TGA with a consecutive tubular reactor. In all experiments, the TGA was heated from 105 to 10508C at a heating rate of 5 K min 21 . The tubular reactor was operated at temperatures of 600, 700 and 8008C at different residence times, these being achieved by providing the reactor with three independent heating zones. For the tubular reactor, a one-dimensional ¯ow model was employed which took axial dispersion and the non-isothermal state into consideration. It was found that different types of tar are produced from pyrolysis of spruce wood. One of these types does not crack, for the other types, kinetic parameters for tar cracking and distribution coef®cients for the formation of product gases were determined.