Abstract
Biomass and distillery wastewater are promising sources to produce H2-rich syngas through the thermal conversion. We propose the organic waste chemical looping gasification (OW-CLG) scheme for hydrogen production with straw stalk and concentrated distillery wastewater as feedstock. V2O3 was employed to promote methane reforming and enhance the efficiency of hydrogen production by partially oxidation. Experiments under different temperatures (T) and the molar ratio of V2O3 to CH4 (nV2O3/nCH4) are performed in details. The results show that the above parameters have a significant effect on OW-CLG process. The optimal methane conversion rate of 44.9 % is obtained at oxygen excess ratio, temperature, and mV2O3/mcorn stalk of 0.2, 700 ℃, and 2.16 respectively. The highest H2 yield is 2.05 l with 1 g corn stalk and 20 ml ethanol model solution. The reaction kinetics and the thermodynamics were analyzed, verifying that the introduction of ethanol liquid waste and V2O3 could boost hydrogen generation. The corn stalk OW-CLG is an endothermic process with the total endothermic heat of 5.396 kJ/mol. The thermodynamically feasible temperature range for the partial oxidation of CH4 to hydrogen by V2O3 is above 950 K. V2O3 OC during OW-CLG is regenerated by the reaction of VC and CO2.
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