Method and system for recovery of CO2 gas in cement-manufacturing facilities

摘要

An object of the present invention is to separate CO 2 gas generated in a cement-manufacturing facility in a high concentration and recover the CO 2 gas. The present invention includes: feeding a cement material before calcination and a heat medium which has a particle diameter larger than that of the cement material and has been heated to the calcination temperature or higher in a medium-heating furnace (14), to a mixing calciner (12); and recovering the CO 2 gas generated by the calcination of the cement material. The heat medium circulates between the medium-heating furnace and the mixing calciner. Another aspect of the present invention includes: feeding a cement material before calcination to a regenerative calciner (112) which has been heated to the calcination temperature or higher and has stored heat therein; and recovering the CO 2 gas generated by the calcination of the cement material.