Graded recovery system for medium-pressure steam tail gas of setting machine

The utility model discloses a grading recovery system for medium-pressure steam tail gas of a setting machine, which comprises at least two flash evaporation tanks, a plurality of flash evaporation tanks are connected in series to form a multi-stage recovery unit, a water inlet of the first flash evaporation tank is connected with a heat exchanger of an external setting machine through a pipeline, and a water outlet of the second flash evaporation tank is connected with a heat exchanger of the external setting machine through a pipeline. The water inlet of each flash tank is connected with the water outlet of the previous flash tank through a pipeline, the top of each flash tank is communicated with a gas outlet pipe, and the gas outlet pipe is used for discharging low-pressure steam. Heat energy of tail gas is recycled to the maximum extent, consumption is reduced, and cost is saved; and tail gas generated by high-temperature process pre-shaping and tail gas generated by low-temperature shaping and drying ar