Techno-economic and sensitivity analysis of coconut coir pith-biomass gasification using ASPEN PLUS

The study on the steam gasification of biomass char is important to evaluate the performance of steam gasification of biomass and its char. A validated ASPEN plus model was used to investigate the effects of temperature (1023, 1073, 1123, 1173, and 1223 K) and steam-to-feed ratio (0.5, 1.0. 1.5. 2.0, and 2.5) on the syngas output and its composition using steam gasification of coir pith and its char. The study also compared the output and composition of syngas of both processes conducted at 1123 K and 0.75 (steam-to-feed ratio). The techno-economic analysis of both gasifications at the above condition was also investigated. The sensitivity analysis indicated that the temperature has both positive and negative influences; while increasing the steam-to-feed ratio has only a positive influence on the syngas output. Further, it was observed that the increase in temperature increased the yield of H₂ and CO, but it decreased the yield of CO₂ and CH₄. Meanwhile, it was noted that the increase in steam-to-feed ratio increased the yield of H₂ and CO₂ however, it decreased the yield of CO and CH4. The comparative study indicated that the coir pith char gasification generated 27% more syngas output and 25% more H₂ + CO composition than the coir pith gasification. The techno-economic analysis indicated that the coir pith char steam gasification can generate 1.12 times more revenue than coir pith steam gasification. It can be concluded that the biomass char gasification is more advantageous than biomass only gasification.