Abstract
Empty fruit bunch (EFB) and bagasse, which are now and in near future quite abundant biomass residues in Southeast Asia, were gasified using steam or (steam + oxygen) as a agent in an entrained-flow type reactor at 900 °C. When using steam alone, EFB was gasified well (carbon conversion rate into gas was defined as gasification over 95%) and the hydrogen-rich gas suitable for liquid fuel synthesis ([H2]/[CO]=about 3-3.6) were obtained. Theoretical value of [H2]/[CO] required for many types of liquid fuel synthesis processes is about 2. However, hydrogen rich gas is desirable, because the processes are stabilized by the excess hydrogen. Bagasse was not so well gasified (gasification rate: about 90%) and the [H2]/[CO] was about 1.5-1.8, which was lower than that of EFB, in spite of being gasified under similar conditions. When adding oxygen to steam, rates of both EFB and bagasse were improved (over 98%). By adding oxygen, the [H2]/[CO] obtained from the EFB decreased from 3.6 to 2.7, which were still high enough for liquid fuel synthesis. The ratio from the bagasse decreased to 1.3, which was much lower than optimum value, 2, for liquid fuel synthesis. Tar yields of all the cases were quite low (2]/[CO]) would be required for liquid fuel synthesis.
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