The low-energy-consumption CO2
trapping device comprises a bin body, a gas inlet
pipe and a discharging
pipe are arranged on the bin body, a first liquefying box and a second liquefying box are symmetrically arranged in the bin body, the gas inlet
pipe is connected with the two liquefying boxes through a first gas distributing pipe and a second gas distributing pipe, and the first gas distributing pipe and the second gas distributing pipe are provided with electromagnetic valves. The bottom end of the liquefying box is connected with a discharging pipe through a first discharging pipe and a second discharging pipe which are provided with one-way valves; the gas distribution pipe penetrates through the filter box, a detachable filter layer is arranged in the filter box, a
plate heat exchanger is arranged on one side of the
liquefaction box, and a jacket type low-temperature rectifying column is mounted in the
liquefaction box. The
trapping method comprises the steps of pretreatment, split-flow gas inlet,
liquefaction trapping,
discharge backflow prevention, dynamic adjustment and maintenance, and a single / double-box
operation mode can be switched according to the CO2 emission load. The device realizes continuous and stable capturing process, dynamic and controllable
energy consumption, high CO2 capturing purity and
recovery rate, is convenient to maintain, is suitable for
industrial emission sources of power plants, chemical plants and the like, and has remarkable energy-saving effect and industrial application value.