Energy, exergy, and economic analyses of a novel biomass-based multigeneration system integrated with multi-effect distillation, electrodialysis, and LNG tank

International audienceIn this study, a novel multigeneration system is considered from energy, exergy, and economic points of view. The combined system composed of biomass gasifier, CO2 cycle, cooling system, multi-effect distillation (MED), and electrodialysis was assessed. This integrated system produces electricity, cooling, distilled water, sodium hydroxide (NaOH), and hydrogen chloride (HCl). A parametric study regarding moisture content of biomass, the efficiency of expander I, LHV of biomass, the salt concentration of seawater, and a number of MED effects on system performance was conducted. The obtained energy and exergy efficiencies of modeled MGS are 75.1% and 88.4%. The highest and lowest exergy destruction rates (EDR) belong to the liquefied natural gas line and electrodialysis, respectively. The proposed MGS produces 73.17 GWh of cooling, 103 GWh of electrical energy, 1223 Ton of NaOH, 1114 Ton of HCl, and 212.6 m 3 of potable water annually. The influence of expander I on energy and exergy efficiencies of the CO2 cycle was investigated. Results revealed that increasing the LHV of the biomass results in a decrement of both energy and exergy efficiencies of MGS and recovery ratio. When considering the biomass moisture content, the efficiencies of exergy and exergy of MGS diminished with a rise in moisture amount