CARBON DEOXIDE CAPTURING METHOD TO REDUCE ENERGY CONSUMPTION

摘要

PURPOSE: A carbon dioxide retrieving method is provided to supply partial energy necessary for a regeneration reactor by supplying the heat, generated during the formation of a carbon dioxide saturable absorbent at an absorption reactor, to a dry absorbent through a thermal medium, and thereby reducing the consumption of energy put into a process. CONSTITUTION: A carbon dioxide retrieving method includes the following steps: a step of putting a dry absorbent and a thermal medium into an absorption reactor(1) at the same time, yet carbon dioxide among mixed gases, which are supplied to the inside of the absorption reactor, is combined with the dry absorbent and transferred to a regeneration reactor(4), and the mixed gases from which the carbon dioxide is removed are discharged to the outside; and a step of separating the absorbent, combined with the carbon dioxide transferred to the regeneration reactor, into an absorbent and carbon dioxide with supplied steam. The thermal medium is sand or silicon. The dry absorbent and thermal medium are mixed and fed with a weight ratio of 80-95:20-5. The average particle diameter of the thermal medium is 50-150 Mm. The dry absorbent is a potassium carbonate-based compound or a sodium carbonate-based compound. The mixed gases include 5-20 weight% carbon dioxide, 5-20 weight% oxygen, and 60-80 weight% nitrogen.