evaluation of CO2 utilisation for fuel production

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evaluation of CO2 utilisation for fuel production ( evaluation-co2-utilisation-fuel-production )

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hoc expanders (around 8 MW), that combust purge gases. According to Figure 3, around 120 MW are available at over 220 °C and can be used for steam generation. The steam generated is directly used in the four turbines (that replace the electric motors of the four CO2 compressors). A complete steam system is designed for the MeOH integrated process. 350 300 250 200 150 100 50 0 0 50 100 150 Heat transferred (MW) Pinch point Hot composite curve Cold composite curve Figure 3: Composite curves of the reference process for MeOH synthesis for a minimum temperature difference of 10 K. The new approach requires a more complex heat exchange network (HEN). The process flow diagram of the integrated process is shown in Figure 4. Saturated steam at 25 bar is now produced in heat exchanger 13, which is placed directly after the reactor to extract energy at high temperature from the hot composite. Heat exchangers 11 and 18 are added to integrate the heat required for the cold composite. The recycle stream is heated in heat exchanger 18 with hot water coming from the intermediate coolers, the partial condenser of the distillation column and the final condenser 25. The steam generated from boiler 30 at 90 bar and boiler 13 at 25 bar, are expanded in a system of two and two steam turbines, a total of four steam turbines (not depicted in Figure 4). Figure 4: Process flow diagram of the integrated process for MeOH synthesis from CO2 and H2 from electrolysis. 35 T ( C)

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