Cryogenic carbon capture system and method with integrated liquid natural gas vaporizer

Abstract

A desublimating heat exchanger receives a cooled process gas stream from a pre-cool heat exchanger and includes a clean gas outlet, a contact liquid inlet and a slurry outlet. A contact liquid heat exchanger communicates with the contact liquid inlet of the desublimation heat exchanger and warms a liquid natural gas stream to provide cooling within the contact liquid heat exchanger. The desublimating heat exchanger contacts the cooled process gas stream with the cooled contact liquid so that carbon dioxide is absorbed within the contact liquid whereby a carbon dioxide laden slurry stream and a carbon dioxide depleted clean process gas stream are formed. The clean process gas stream passes through the clean gas outlet to the pre-cool heat exchanger and the slurry stream passes through the slurry outlet. The pre-cool heat exchanger warms the clean process gas stream to provide cooling for the process gas stream. A solid separation device communicates with the contact inlet of the desublimating heat exchanger and separates the carbon dioxide laden slurry stream from the desublimating heat exchanger into a condensed carbon dioxide stream and a contact liquid stream.

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