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NPV, the following univariate and bivariate sensitivity analyses have been performed for the MeOH process. 4.2.1 Methanol CDU plant univariate sensitivity analyses results The selected variables: price of MeOH; price of O2; and price of CO2, are varied widely in order to obtain a NPV equal to zero. The electricity price and the ISBL are varied within a specific interval. As upper bounds, the electricity doubles its price and the estimated ISBL remains as it is. As lower bounds, the electricity price is zero and the ISBL goes down to 45 % of its original value. These last two variables are depicted in orange in Figure 7. According to Figure 7, the most important influence on the NPV is from electricity and MeOH prices (as the variables with larger slopes). These are followed by ISBL, CO2 and O2 prices. The breakeven values (i.e. the prices that make NPV equal to zero) are summarised in Table 4; ISLB cannot reach a zero NPV. The negative CO2 price indicates that the CDU plant would have to be paid for each tonne of CO2 that is used as raw material. 0 0.5 1 1.5 2 1000 0 -1000 -2000 -3000 -4000 -5000 -6000 -7000 -8000 MeOH O2 CO2 Elec ISBL Figure 7: NPV variation with prices of MeOH, O2, CO2, electricity and ISBL. These are represented by relative increments/decrements towards the original values considered. Table 4: Breakeven prices for NPV=0, for the MeOH CDU plant. MeOH O2 CO2 Electricity Breakeven price (€/t) 1 378 670 -665 9 (€/MWh) Reference price (€/t) 350 54 38 95 (€/MWh) Based on these results, different circumstances may occur for the MeOH to become profitable; a product price increase by almost four times, a lower price for electricity (as the variable with largest slope) and/or a reward for using captured CO2 would enable the MeOH CDU plant to be economically competitive. However, the numbers in Table 4 show unrealistic prices for CO2 and O2. 4.2.2 Methanol CDU plant bivariate sensitivity analyses results Taking into account the variables with larger slope in the previous analysis, the price of electricity and the price of MeOH, and our interest in the price of the tonne of CO2, Figure 8 and Figure 9 summarises the bivariate analyses, with the electricity price as the independent variable. This varies between zero ("free" electricity) and EUR 100/MWh. The dependent variables are the price of CO2 in Figure 8 and the price of MeOH in Figure 9, which make NPV equal to zero. It is seen that, for the 40 NPV (M€)PDF Image | evaluation of CO2 utilisation for fuel production
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