A pulsating H2O approach to improve biochar reactivity and syngas
quality: Insight into interactions of biochar-CO2/H2O
Interaction of biochar gasified in the mixed CO2/steam is still unclear.
In this study, the interactions between biochar with CO2 (C-CO2) and
with steam (C-H2O(g)) were systematically investigated using a TG
analyzer and a tube furnace. Results show that the chemical reaction
state and intrinsic ash were the essential reasons for the existing
together of the three interaction effects between C-CO2 and C-H2O(g).
Specially, an inhibitive effect occurred during the demineralized
biochar gasified in the CO2/H2O(g) atmosphere, expressing that the C-CO2
was inhibited by the C-H2O(g) under the chemical reaction regime. A
competitive effect was dominated the interactions of demineralized
biochar-CO2/H2O(g) under either intra- or extra-particle mass transfer
regime; while an evolution of “inhibition to competition” appeared
under the diffusion reaction regime. The presence of intrinsic ash such
as Ca element was conducive to the occurring of the synergistic effect