Device for simulating CH4 and gas nonlinear seepage of CO2-driven coal seam

The invention discloses a CO2-driven coal seam CH4 and gas nonlinear seepage simulation device, which comprises a deep coal seam environment simulation system, a gas source constant pressure control device, a back pressure device, a vacuum device, a gas collection device and a data acquisition device, and is characterized in that the deep coal seam environment simulation system comprises a clamp holder framework, a hand pump, a pressure gauge I and a pressure sensor III; a temperature control device sleeves the holder framework, a cavity is formed in the holder framework, a rubber sleeve is arranged in the cavity, a pair of coal body contact ends are symmetrically arranged at the two ends of the rubber sleeve, the free ends of the pair of coal body contact ends abut against threaded ends, the cavity is communicated with a hand pump through a first water pipe, and a fourth valve is arranged on the first water pipe; the first pressure gauge is used for detecting pressure in the cavity, and the third pressure se