CO2 capture and recovery system

The invention discloses a CO2 trapping and recycling system. The CO2 trapping and recycling system comprises a first combustion furnace, a first CO2 removal device, a second combustion furnace and a second CO2 removal device. And the first CO2 removal device is communicated with an outlet of the first combustion furnace. The second combustion furnaces and the second CO2 removal devices are correspondingly grouped, at least one group is arranged, and the second combustion furnaces are communicated with the outlet of the first combustion furnace through the second CO2 removal devices. The second CO2 removal device is used for removing CO2 in the coal gas discharged by the second combustion furnace and mixing the removed CO2 with the coal gas discharged by the first combustion furnace, and the first combustion furnace conveys the mixed gas to the first CO2 removal device for CO2 removal, so that the concentration of CO2 in the coal gas discharged by the first combustion furnace can be increased; the CO2 removal