Combination with biomass pyrolysis and dry/steam reforming for adjustable H2/CO syngas production

A two-stage process of biomass pyrolysis and dry/steam reforming for adjustable H2/CO syngas production is proposed. This process can not only control the ratio of H2/CO, but also realize the utilization of coke generated in the gasification process and reduce the energy consumption of biomass gasification, as well as the utilization of CO2. The process model was built after the pyrolysis experiment, and the thermodynamics of dry/steam reforming was studied under different reforming temperature, CO2/C, and H2O/C. With the increase in reforming temperature, the volume of CO increases gradually, and the volume of H2 increases first and then decreases. With the increase in CO2/C, the volume of CO increases gradually and the volume of H2 decreases gradually, while with the increase in H2O/C, the volume of CO decreases and the volume of H2 increases, so diverse-H2/CO-ratio syngas can be obtained by adjusting the H2O and CO2 input as well as the reforming temperature. For the production of syngas with H2/CO = 2, by comparing the total volume of gas produced and energy consumption, the optimum reforming conditions are obtained: CO2/C = 0.5, H2O/C = 2, and the reforming temperature is 770 ℃. Similarly, the optimum reforming conditions for the production of syngas with H2/CO = 3 are: CO2/C = 0, H2O/C = 2, and the reforming temperature is 770 ℃.