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Abstract

A device for recovering carbon dioxide and nitrogen from flue gas includes a pretreatment system, a CO₂and N₂separation system, a N₂purification and liquefaction system, and a CO₂ purification and liquefaction system. The pretreatment system includes a high-temperature NG cooler, a gas-liquid separator, a booster fan, and a dryer; the CO₂and N₂ separation system includes a low-temperature LNG cooler and a cryogenic adsorption device; the N₂ purification and liquefaction system includes a set of N₂ distillation and liquefaction device consisting of a compressor, a cooler, a heat exchanger, a gas-liquid separator, and a distillation tower; and the CO₂purification and liquefaction system includes a set of CO₂ distillation and liquefaction device consisting of a compressor, a cooler, a condenser, an evaporator, a liquefier, and a purification tower, which are used for further purifying and liquefying desorbed gas obtained from the CO₂and N₂ separation system.

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First Claim