THE ENERGY-ENVIRO-ECONOMIC EVALUATION AND MULTI-OBJECTIVE OPTIMIZATION OF THE HYDROGEN PRODUCTION PROCESS FROM COAL-BIOMASS CO-GASIFICATION CONSIDERING UNCERTAINTY IN CARBON PRICES

Hydrogen has attracted more and more attention due to its advantages of low environmental impact and high energy density. However, the current hydrogen production process based on coal is usually accompanied by high energy consumption and CO2 emission. Therefore, it is particularly important to develop efficient and clean hydrogen production technology. Based on this, a poly-generation system based on the co-gasification of coal and biomass coupled with carbon capture was proposed. Carbon dioxide emissions pricing is employed as an approach to mitigate climate change. Therefore, the impact of carbon prices on co-gasification system is analyzed, and the energy-enviro-economic evaluation of the system is carried out. Besides, the trade-off between exergy efficiency, annual gross profit and annual carbon emissions is conducted by multi-objective optimization. The results show that the system can be operated successfully under the optimum settings, achieving green and efficient hydrogen production while obtaining high economic benefits.