CONFIGURATIONS AND METHODS OF CO2 CAPTURE FROM FLUE GAS BY CRYOGENIC DESUBLIMATION

摘要

Systems and methods of CO2 desublimation are presented in which refrigeration content is retained within the system. Most preferably, refrigeration content is recycled by providing the refrigeration content of a CO2-lean feed gas to the CO2-containing feed gas and to pre-cooling of a desublimator, and/or by providing refrigeration of effluent of a desublimator in regeneration to a refrigerant in a closed refrigeration cycle for deep-cooling of another desublimator.

主权项

1. A method of treating flue gas in a flue gas treatment plant, comprising:
using a first desublimator to receive a precooled flue gas, and to produce solid CO2 and a cold CO2-lean flue gas using desublimation; using the cold CO2-lean flue gas to pre-cool a second desublimator to a temperature above desublimation temperature for CO2, thereby forming a cool CO2-depleted flue gas, and using residual refrigeration content of the cool CO2-depleted flue gas to cool a feed gas to thereby form the precooled flue gas; wherein the first desublimator is deep-cooled using a refrigerant of a refrigeration cycle before the step of using the first desublimator; and wherein the refrigeration cycle is thermally coupled to a heat exchanger that cools the refrigerant in the refrigeration cycle using refrigeration content of stream within the flue gas treatment plant.