Novel reaction system of propane dehydrogenation device

The invention relates to a novel reaction system of a propane dehydrogenation device, which adopts a reaction feeding and discharging efficient heat exchanger to directly preheat raw material gas by high-temperature reaction gas at an outlet of a reactor, so that the feeding temperature of the raw material gas is increased, the consumption of fuel gas in a heating furnace is reduced, and the utilization efficiency of high-grade energy in the reaction system is effectively improved; the emission of flue gas and tail gas of the device is also reduced; meanwhile, the adopted axial-radial fixed bed reactor has the characteristics of small reaction pressure drop, small occupied area, low catalyst loss, low investment cost, high reaction conversion rate and the like. In the arrangement process, the inlet heat exchanger and the outlet heat exchanger are arranged in parallel and close to the propane dehydrogenation reactor, so that the length of a product gas high-temperature pipeline is reduced, and the thermal crac