METHOD AND APPARATUS FOR CAPTURING CARBON DIOXIDE IN FLUE GAS WITH ACTIVATED SODIUM CARBONATE

摘要

Disclosed are a method and an apparatus for capturing carbon dioxide in flue gas with activated sodium carbonate. According to the method, an aqueous sodium carbonate solution added with an alcoholamine activator is used as a CO2 absorbent, the alcoholamine is bonded to CO2 first to generate an amphoteric intermediate, and then hydrated, so as to be released again for recycling, H+ generated in hydration is neutralized by a basic ion CO32-, HCO3" generated in hydration is bonded to the metal ion Na+ to form sodium bicarbonate which is deposited gradually, and finally a sodium bicarbonate slurry is obtained. Through decomposition, the sodium bicarbonate slurry is regenerated to obtain gas CO, and an aqueous sodium carbonate solution, and the gas CO, is processed into a liquid through conventional treatment. The apparatus mainly consists of an absorption column (1), inclined plate sedimentation tank (6), a regeneration column (10), a cooler (17), a gas-liquid separator (16), a drier (15), a compressor (14) and a condenser (13) that are connected via pipes,