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Heterogeneous Cracking of Wood Pyrolysis Tars Over Fresh Wood Char Surfaces by Michael L. Boroson; Jack B. Howard; John P. Longwell; William A. Peters is a Engineering article available to read on EtoBox.

What is Heterogeneous Cracking of Wood Pyrolysis Tars Over Fresh Wood Char Surfaces about?

Char-induced conversion of newly formed wood pyrolysis tars was measured for independent variations in temperature and tar-char space time. Tar vapors were generated by controlled devolatilization of shallow (-2 cm deep) packed beds of 45-250-pm particles of sweet gum hardwood. The t a r vapors were extensively diluted in a helium carrier gas and then rapidly conveyed to an adjacent reactor for controlled thermal treatment with (or without), 0.2-12 cm deep beds of fresh char from pyrolysis of the same type of wood. Heterogeneous conversion is defined as the net tar loss from exposure to the wood char (Le. after subtraction from the total tar lost during thermal treatment the amount of tar destroyed by vapor-phase cracking upstream and downstream of the char bed).Heterogeneous conversion was significant but essentially constant at 14 f 7 wt 9% of tar (to 2 standard deviations), for temperatures from 400 to 600 "C and space times from 2.5 to 100 ms. In contrast, vapor-phase tar conversion upstream of the char bed ranged from 0% at 400 "C to 30% (wt % of tar) at 600 "C. The implication is that an otherwise thermally stable fraction of newly formed wood pyrolysis tars is very reactive

Who reads Heterogeneous Cracking of Wood Pyrolysis Tars Over Fresh Wood Char Surfaces?

Author

Michael L. Boroson; Jack B. Howard; John P. Longwell; William A. Peters

Published

1989

Language

EN

Field

Engineering (Physical Sciences)