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3.4.3 Black-box units There are two units which are evaluated (as depicted in Figure 1), but that are not modelled in CHEMCAD: the CO2 purification unit and the electrolyser. The unit selected to clean up the CO2 is a membrane. It is assumed that the use of electricity or steam of this purification unit is negligible in relation to the needs of the rest of the plant, comparing values from [53] and electricity needs from the CDU plant. It is also assumed that the unit can treat any type of inlet composition, under any conditions of pressure and temperature, and that the pressure drop over the membrane is negligible. The total purchase cost of the equipment is EUR 435/m2, and it is sized according to a ratio of 3.9 m3/s, treated in 3 335 m2 of membrane [53]. The FCP are included in the costs of the plant estimate, as a percentage of the investment costs. The device selected to produce hydrogen is an alkaline electrolyser, as it is the most commercialised one to date [52]. A large-scale electrolyser (72 MW) is considered for the MeOH CDU plant. It consumes 1.5 kWe/kWH2 and the investment cost is EUR 638/kW [52]. A power law formula that takes into account economies of scale, with a scale factor of 0.6, is used to calculate the cost of this equipment. The FCP are included in the costs of the plant estimate, as a percentage of the investment costs. The VCP are characterised by its electricity consumption. 36PDF Image | evaluation of CO2 utilisation for fuel production
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