Flue gas pretreatment and carbon dioxide (CO2) capturing purification recycling device

The utility model relates to a flue gas pretreatment and carbon dioxide (CO2) capturing purification recycling device. The device comprises an absorber, a heat exchanger of a barren solution and a pregnant solution, a heat pump system, a heater, a regenerator, a flash evaporator, a vapour compressor and a cyclone separator, wherein an absorption-type heat pump is used for effectively converting reaction heat of the absorber into heat required by the regenerator; a vapour recompression heat recycling system can be used for decreasing the temperature of the barren solution; a generated flash-evaporating vapour is heated by the vapour compressor and then returned to the bottom of the regenerator; a high-temperature vapour generated by the heater is introduced into the bottom of the regenerator from the top of the heater; the generated high-temperature pregnant solution can be respectively introduced into the regenerator from the upper part and the middle of the regenerator. The device has the advantages of low energy consumption, good treatment effect, high CO2 capturing purity and high CO2 capturing efficiency. Thus, the device is a unique means for flue gas pretreatment and CO2 capturing purification. According to the device, the purity of the obtained CO2 can reach 99.9% in a pressure range being from 0.1MPa to 1MPa. Therefore, compared with the traditional process, the device provided by the utility model has the advantage that the energy consumption is saved by more than 30%.