مشخصات پژوهش

The increasing need of humans for energy and the limited resources of fossil fuels require too much attention to replacing renewable energies with the energies from fossil fuels. Hydrogen is one of the most significant renewable energies. Liquefaction is used for storing and transferring this fuel to other areas. Waste heat can be used in other integrated structures at the time of liquefying hydrogen. In this study, an integrated structure was developed for the simultaneous production of liquid hydrogen (LH2) and liquid fuels (LF) using electrolyzer, hydrogen liquefaction cycle, Fischer-Tropsch synthesis, and car- bon dioxide power cycle. The integrated structure produced 1.157 kg/s liquid hydrogen, 3.756 kg/s liquid fuels, and 359.8 kg/s hot water. The natural gas to liquid (GTL) process was developed by absorbing the steam generated from the waste thermal energy of the liquid hydrogen production cycle, the oxygen produced by the electrolyzer, and natural gas in the reforming reactors and the Fischer-Tropsch syn- thesis. The GTL process was highly exothermic and the released energy from the liquid fuel production was used for power production. The specific power consumption of the hydrogen liquefaction cycle was 6.642 kWh/kg LH2. The power to fuel and exergy efficiencies of the integrated structure were 83.75% and 62.54%. The exergy analysis of integrated structure indicated that electrolyzers with a share of 48.05% and reactors with a share of 15.16% had the maximum amount of exergy destruction. The results of the economic analysis of the system depict that the period of return and additive value were 3.581 years and 71.39 $/m3 LF.