(699f) Liquefaction Process, Energy Storage of Cryogenic Carbon Capture

Authors: 
Fazlollahi, F., Brigham Young University
Baxter, L. L., Brigham Young University

The cryogenic carbon capture (CCC) process is an innovative energy storage system that can be integrated by using an open loop natural gas refrigeration system. This system stores energy during non-peak times by liquefying gas. When the energy is at a premium during peak demand, the liquefaction of natural gas terminates and the stored liquefied natural gas carries out the cryogenic separation process relieving the parasitic load on the power plant. The natural gas combusts in a simple natural gas turbine increasing the power output of the plant during peak demand, only after the gas has been vaporized and warmed.

In this paper, novel steady state and dynamic modeling of the natural gas liquefaction process have been designed and simulated by Aspen HYSYS. The unit energy consumption, sizing costs and liquefaction rate are selected as the objective functions and are optimized with several key variables of the process. The results show that efficient heat exchangers are highly recommended and will result in significant energy consumption reduction with the objective of maximized energy savings, considering capital costs as the natural gas liquefaction process consumes a large amount of energy.

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