The invention belongs to the technical field of
coal-fired
flue gas treatment, particularly relates to a
coal-fired
flue gas
carbon dioxide capturing and purifying device, and provides the following scheme aiming at the problem that an organic
amine solvent is carried in the existing discharged purified
flue gas: the device comprises a composite absorption
tower, and the circumferential bottom end of the composite absorption
tower is fixedly connected with a
flue gas inlet
pipe; the top end of the composite absorption
tower is fixedly connected with a
flue gas outlet
pipe, a washing cooling mechanism, an organic amine primary absorption mechanism and an organic amine secondary absorption mechanism are sequentially and fixedly arranged in the composite absorption tower from bottom to top, and a purification cylinder is fixedly arranged on the outer side of the composite absorption tower. According to the invention, the purification cylinder is composed of the U-shaped section and the L-shaped section, so that purified
flue gas is firstly introduced into the absorbent, organic amine entrained in the purified flue gas is fully contacted with the absorbent to be physically absorbed and dissolved, the purified flue gas overflows from the absorbent, then the purified flue gas sequentially passes through the plurality of
drying sleeves and the plurality of adsorption sleeves, the purified flue gas is firstly dried, and then the purified flue gas is discharged. And then trace organic amine entrained in the purified flue gas is adsorbed.