Efficient strategy of utilizing alkaline liquid waste boosting biomass chemical looping gasification to produce hydrogen

Abstract

The chemical looping gasification (CLG) between biomass and Fe2O3 be expressed as a potential hydrogen production technology as long as Fe2O3 could be effectively alkali-modified and enough steam could be supplied to the biomass gasification process. Therefore, a one-step strategy was developed herein by introduces KNO3-containing acetic acid liquid waste to modify Fe2O3 and provide enough steam to improve the efficiency of hydrogen production from corn stalk. Experiments under different excess oxygen ratio (Ω), temperature (T) and potassium concentrations (mKNO3) shows that these parameters have obvious effects on biomass CLG, and the highest hydrogen yield of 1.79 L is obtained at Ω = 0.2, T = 750 °C and mKNO3 = 8%. The kinetic and thermodynamic analysis further verifies that KNO3-containing acetic acid liquid waste boosts biomass CLG for hydrogen generation. The proposed CLG strategy has dual advantages of waste treatment and energy conversion.