High solids flux circulating carbonation reactor

摘要

The present invention relates to a method for capturing carbon dioxide CO2 by carbonation in a circulating fluidized bed (CFB) carbonation reactor wherein temperature profile is adjusted by recirculation of solid fractions of metal oxide MeO and metal carbonate MeCO3 to the CFB carbonation reactor. Also a system recirculating the metal oxide MeO and metal carbonate MeCO3 is provided by the invention.

主权项

1. A method for capturing carbon dioxide (CO2) by carbonation in a circulating fluidized bed (CFB) carbonation reactor comprising the steps of:
forwarding a metal oxide (MeO) rich stream to the CFB carbonation reactor; forwarding a carbon dioxide rich flue gas stream to the CFB carbonation reactor; capturing the CO2 present in the flue gas by reacting the CO2 with metal oxide (MeO), forming metal carbonate (MeCO3); separating the MeCO3 from the flue gas in a separation device; collecting a MeCO3 rich solids stream from the separation device; subsequently cooling and dividing the MeCO3 rich solids stream to form at least one or more cooled portions of the MeCO3 rich solids streams; adjusting the temperature profile of the CFB carbonation reactor by addition of one or more cooled portions of the MeCO3 rich solids stream to the CFB carbonation reactor at one or more selected locations to optimize the temperature profile for capturing of the CO2, wherein the temperature profile of the CFB carbonation reactor is adjusted by recirculating a first cooled portion of the MeCO3 rich solids stream to a lower region of the CFB carbonation reactor.