One of the solutions to utilizing LNG cold energy at import terminals is supplying it to an ASU, replacing an external refrigeration process and reducing the power consumption. Thus, two different options for the integration of a novel single column ASU process with LNG vaporization have been developed to achieve optimal use of the cold energy. After optimizing the heat integration part, both energy and exergy analyses have been performed to evaluate and compare the two integration options. The results indicate that the single column ASU process, pre-cooled by an LNG stream has a lower specific power consumption (0.281 kWh/kg) than the integration option with a liquid nitrogen production cycle (0.310 kWh/kg). The integration option with precooling also delivers a higher exergy efficiency for different LNG pumping pressure levels, compared to the alternative with a liquid nitrogen production cycle.
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