Hydrogen-Enriched Syngas from Biomass Steam Gasification for Use in Land-Based Gas Turbine Engines - Novel Combustion Concepts for Sustainable Energy Development - page 103

Table 5 Ef ciency of
gasi cation with CaO

Test # 1 2 3

Reactor temperature ( ° C) 657 690 701

S/B ratio 2.9 2.9 2.1

Gas residence time (s) 2.7 2.6 2.7

Cold gas efficiency (%) 56 70 76

Energy ef ciency (%) 32 39 47

Hydrogen production ef ciency (%) 16 23 27

Fig. 15 Thermodynamic inputs/outputs for gasi cation with CaO for maximum ef ciency case
(T = 701 ° C, S/B = 2.1, = 2.7 s)

τ

releases 170.5 kJ/mol and added 10 % of the energy input to the system during this
particular test. This heat content can be thought of as a battery, while energy was not
inserted externally during testing, an equal amount of energy must be added during
the regeneration phase. The energy addition from the CaO reaction was added to the
energy ef ciency equations to give a more

accurate measure of energy use during this phase. This is more useful when ana-
lyzing catalytic testing for use in a dual

ciency and hydrogen production ef

fl fluidized bed, which is its most likely use.

4 Summary and Conclusions

Currently, the most effective method for producing hydrogen-enriched synthesis
gas from biomass is steam gasi

cation has been shown to
produce a synthetic gas with high hydrogen concentration (>70 %) under certain

cation. Steam gasi