Process simulation with stoichiometric mass, energy and exergy balance analysis of a pilot bio-light olefin production facility via gasification and methanol synthesis from forestry residues were investigated using Aspen Plus software. The mass yield of the process was 0.127kg light olefins per kg dry feedstock, which was comparable to the current status for biofuel production. 40.7% of potential energy of the forestry residue feedstock leaves as bio-light olefin, together with 2.33% as electricity export. The exergetic analysis of the whole process indicated that 22.6%, 22.2% and 11.5% of feedstock exergy were irreversible lost in the boiler/turbogenerator, gasifier and light olefin separation. And the exergetic efficiency of light olefins was 32.1%. The calculation procedure and balance evaluation criterial presented offered a valuable theoretical basis for improving process performance for bio-light olefin production application.
Keywords light olefins, forestry residue, energy and exergy, gasification, methanol synthesis