The tars generated would then have sufficient time to be
cracked in the fluidized bed gasifier operated at ~800 C. In
particular, primary tar is known to be well destroyed below 800 C
[33]. Some of the tars generated in the auger reactor could also be
cracked in the auger reactor. The comparison between Runs 2 and 6
shows that the H2 production was significantly increased when the
three-stage gasifier was applied. The results appeared to result
from the enhanced tar cracking with the three-stage gasifier, which
produced H2 as a product. The three-stage gasifier also brought
about an improvement of CGE and CCE, and an increase of the
producer gas yield.