Abstract
Fischer-Tropsch fuels from renewable sources may contribute to defossilize the transport sector, especially where high energy-dense fuels are required. The objective of this work is to analyze the impact of the RWGS operating conditions with respect to minimizing the net production cost NPC. Therefore, a method to estimate the RWGS reactor costs for varying RWGS operating conditions is introduced. This method allows to identify the respective tube design criterion (pressure drop, heat transfer or kinetic limitation) at a given set of operating conditions as well as to identify the optimum tube geometry with respect to low steel costs. The plant under investigation is assumed to process a constant amount of hydrogen (48.4 ktH2/a) producing 52–82 ktC5+/a syncrude depending on the RWGS operating conditions. The results indicate that the RWGS operating conditions affect the NPC rather through the general process performance than through the impact of the actual reactor costs. The main contributor to the NPC is the hydrogen cost. Different hydrogen cost cases are investigated to identify robust optimum RWGS operating conditions. The minimum NPC is observed at 1.81€/kgC5+, 3.06€/kgC5+ and 5.47€/kgC5+ for 2.3€/kgH2, 4.1€/kgH2 and 7.6€/kgH2, respectively. Intermediate RWGS pressure (5 bar) and temperature (800 °C) allow for low production costs throughout all hydrogen cost cases.
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