Liquid-liquid-solid three-phase system continuous device for capturing CO2 and use method

The invention discloses a continuous device with integrated reaction and separation functions and a use method thereof. The continuous device is used for self-control separation of a liquid-liquid-solid three-phase phase change system generated by CO2 absorbed by a homogeneous solution. The device mainly comprises a reaction phase change unit, a liquid-liquid-solid three-phase separation unit and a self-control unit, wherein a homogeneous absorbent is in contact with CO2-containing gas, and the self-control unit is used for maintaining phase interface balance. The reaction phase change unit can realize gas-liquid phase parallel flow full reaction and generate a phase change transfer process at the top of the reaction tower, so that the gas is purified; the phase separation unit enables the system to separate entrained gas and solid-phase slurry in a downcomer stabilization area, and a lower liquid phase and an upper liquid phase are discharged by a pump or an overflow device and are recycled after regeneratio