Thermodynamic study on energy crops thermochemical conversion to increase the efficiency of energy production.

• Miscanthus giganteus and Arundo donax are characterized by high volatilization. • Difference between reaction temperatures is affected by composition of energy crops. • Arundo donax has higher exergy efficiency of syngas based on CH 4 production. • Arundo donax has the lower biomass chemical exergy compared to Miscanthus giganteus. • The lower equivalance ratio produces higher exergy efficiency of the gasification. The actual paper analyses the performance of different energy crop biomasses, Miscanthus x giganteus Greef et Deu (EC-1) and Arundo donax L. (EC-2) stems, during slow pyrolysis process monitored by simultaneous TG-DTG-MS techniques, through chemical exergy analysis. In addition to considering the physical and chemical characteristics of given feedstocks for their efficient thermo-chemical conversion into pyrolytic gas, in this study, a theoretical simulation for their implementation use in the gasification process was also performed. The performed thermodynamic study with detailed exergy analysis showed that the large contribution of exergy in syngas components such as CO and H 2 originates primarily from cellulose pyrolysis of EC-1, while large exergy contribution in syngas component as CH 4 originates from lignin pyrolysis of EC-2. It was founded that the exergy efficiency of syngas for EC-1 equals 19.04%, which is lower than the exergy efficiency of syngas for EC-2 (20.46%), as a result of higher ash content in EC-1. Also, it was reported that higher carbon (C) and hydrogen (H) contents present in the EC-2 sample generate higher gaseous energy and exergy values, i.e. the increment of exergy efficiency of syngas, by both approaches (pyrolysis and gasification exergy analysis), but results in a lower biomass chemical exergy (18.28 MJ kg−1). The methodology applied to the gasification process was shown a higher exergy efficiency for EC-2 (∼36 – 42%) than for EC-1 (∼33 – 39%), dependant on the equivalence ratio (ER). [Display omitted] [ABSTRACT FROM AUTHOR]