156. Modellierung der Vergasung von Holz in einer zirkulierenden Wirbelschicht

Biomass steam gasification – an extensive parametric modeling study

“…It can be seen that LHV of humid product gas is nearly constant (between 8300 and 8500 KJam 3 s ); LHV for dry product gas ranges between 9900 and 10 800 KJam 3 s . Above approximately 800°C, no methane is produced; some measurements given in the literature (Herguido et al, 1992;de Souza-Santos, 1999;Jennen et al, 1999;Wang and Kinoshita, 1993;Fercher et al, 1998) dier from that considerably and show methane contents up to 10 vol% (see Table 7). This indicates that equilibrium state is not reached in these references; devolatilization of biomass gives high contents in methane and higher hydrocarbons (e.g., C x H y : 24.8 vol% water-free basis; Zanzi et al, 1994), which do not react completely to equilibrium concentrations of CO, CO 2 and H 2 .…”