Process Intensification and Integration for Sustainable Design. Группа авторов
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      where AOC, annual operating cost; VCi, total variable cost for each process unit:

      (2.9)equation

      where TAC, total annualized cost:

      (2.10)equation

      (2.11)equation

      where the tax rate is assumed to be 30%.

      For the other cases, the calculations are similar, except instead of fixed and variable costs only the additional costs were determined. This is done because we are considering only the additional costs for processing a new composition. Similarly instead of ROI, incremental return on investment (IROI) is calculated instead:

      (2.12)equation

      where ΔTCI, the change in total capital investment for a given additional case.

      Finally, the total ROI can be determined for treating multiple feeds from the following:

      where p, probability or likelihood of obtaining a particular feed, and the subscript f denotes feed.

      2.4.3 Safety Index Calculations

      (2.14)equation

      where images mass flow rate (kg/h); HVm, average mass heating value (kJ/kg); ρ, average fluid density (kg/m3); P, average pressure (bar); and ΔFLmix, average explosiveness (%), where the explosiveness for each stream is given as the difference between UFLmix and LFLmix:

      (2.15)equation

      (2.16)equation

      First the process simulation for the six cases is discussed. Specifically the dehydration, the turboexpander, and the fractionation train processes are discussed for all cases. Additionally acid gas removal is considered for the high acid gas case. Acid gas removal is not needed for Feeds #1–5 as acid gas levels (CO2 and H2S) already meet specifications. Free water removal is not needed, as it is assumed only bound water is present (see Section 2.4).

      2.5.1 Process Simulations

      2.5.1.1 Dehydration Process

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      2.5.1.2 NGL Recovery Process

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      2.5.1.3 Fractionation Train

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      2.5.1.4 Acid Gas Removal

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