System and method for reducing carbon dioxide emissions from a flue gas

A calciner comprising:

• a drum that defines a cavity having a first opening and a second opening, the first opening configured to allow loaded sorbent particles to flow into the cavity;
• an outer shell disposed around the drum that hermetically seals the drum so as to define a channel between the outer shell and the drum;
• and
• wherein the drum rotates such that at least some of the loaded sorbent particles are mixed with heat-transferring particles so as to release gaseous carbon dioxide and exit the drum via the second opening as lean sorbent particles, and
• wherein at least some of the released carbon dioxide is circulated as a gas through the channel so as to cool the drum.

A gear ring for a rotating drum of a calciner, the gear ring comprising:

• a body configured to be disposed on an outside of the rotating drum;
• a first channel defined by the body;
• and
• wherein, when the gear ring is disposed on the outside of the rotating drum, the first channel aligns with a second channel, defined by the rotating drum and an outer shell of the calciner, such that a cooling medium is allowed to flow through the first channel and the second channel to cool at least one of the rotating drum and the gear ring.

A method for reducing carbon dioxide emissions from a flue gas, the method comprising:

• converting lean sorbent particles into loaded sorbent particles by absorbing carbon dioxide from the flue gas in a carbonator;
• receiving the loaded sorbent particles from the carbonator at a first opening of a cavity of a drum of a calciner;
• rotating the drum so as to mix the loaded sorbent particles with heat-transferring particles within the cavity such that the loaded sorbent particles release absorbed carbon dioxide as a gas and revert back to lean sorbent particles;
• and
• transporting the reverted lean sorbent particles to the carbonator.