Study On The High Efficient Process For Hydrogen Production From Biomass

The emphasis of hydrogen production from biomass through thermochemical method were high efficiency and low energy consumption. To increase the utilization efficiency of feedstock, a novel process technology was introduced for production of hydrogen, which integrated with biomass pyrolysis, gas-solid simultaneous gasification and catalytic reforming processes. Three main parts were included in this research paper, which were hydrogen production from biochar via steam gasification in a fluidized-bed reactor, an high efficient gasification process for hydrogen production from biomass and the study of catalytic activity of biochar.In the process of hydrogen production from biochar via steam gasification in a fluidized-bed reactor, higher temperature was advantageous in terms of improved hydrogen yield and carbon conversion. Finally,83.3mol hydrogen was generated per kilogram of biochar through steam gasification of biochar in a fluidized-bed reactor at the temperature of900℃and S/C of3. In general,14.90mol potential hydrogen can be generated per kilogram of biomass through steam gasification of biochar in a fluidized-bed reactor.With the high efficient gasification process for hydrogen production, both gasification temperature and reforming temperature had significant effect on hydrogen yield and carbon conversion efficiency. The results showed that both higher gasification temperature and reforming temperature led to higher hydrogen yield and carbon conversion efficiency. But, higher reforming temperature did not favor gas heating value. Compared with the two-stage pyrolysis-catalytic reforming process, hydrogen yield and carbon conversion efficiency were greatly increased from43.58to75.96gH2/kg biomass and66.18%-82.20%in the high efficient gasification process.Biochar was used as steam reforming catalyst, the results indicated that temperature, S/B and WHSV are the key factors that influencing hydrogen yield. An operation temperature of900℃, S/B of3and WHSV of1were selected as optimal conditions. Additional results have also shown that acid treated could decrease the catalytic activity of biochar, due to the possible loss of the AAEM species that removed from biochar during acid treated.