Abstract: Experiments of biomass pyrolysis were carried out in a fluidized bed, and dynamic signals
of pressure andtemperature were recorded. Correlation dimension was employed to
characterize the chaotic behavior of pressure andtemperature signals. Both pressure and
temperature signals exhibit chaotic behavior, and the chaotic behavior oftemperature
signals is always weaker than that of pressure signals. Chaos transfer theory was advanced
to explain theabove phenomena. The discussion on the algorithm of the correlation dimension
shows that the distance definitionbased on rhombic neighborhood is a better choice than the
traditional one based on spherical neighborhood. Theformer provides a satisfactory result
in a much shorter time.

Key words: chaos transfer, correlation dimension, fluidized bed, biomass pyrolysis

摘要： Experiments of biomass pyrolysis were carried out in a fluidized bed, and dynamic signals
of pressure andtemperature were recorded. Correlation dimension was employed to
characterize the chaotic behavior of pressure andtemperature signals. Both pressure and
temperature signals exhibit chaotic behavior, and the chaotic behavior oftemperature
signals is always weaker than that of pressure signals. Chaos transfer theory was advanced
to explain theabove phenomena. The discussion on the algorithm of the correlation dimension
shows that the distance definitionbased on rhombic neighborhood is a better choice than the
traditional one based on spherical neighborhood. Theformer provides a satisfactory result
in a much shorter time.

关键词: chaos transfer;correlation dimension;fluidized bed;biomass pyrolysis