Steam demisting device and polycrystalline silicon production tail gas treatment equipment

The utility model discloses a steam demisting device which comprises a box body and a flow-limiting pore plate, a steam inlet pipeline is arranged at the bottom of the box body, an emptying pipeline is arranged at the top of the box body and is communicated with the atmosphere, through holes which are uniformly distributed are formed in the flow-limiting pore plate, and the flow-limiting pore plate is arranged in the box body and is positioned between the steam inlet pipeline and the emptying pipeline; the bottom of the box body is further provided with a water storage groove and a condensate drainage pipeline, so that water in the steam in the box body is accumulated in the water storage groove and is drained through the condensate drainage pipeline. The steam demisting device disclosed by the utility model can be used for effectively reducing steam emission, reducing resource waste and eliminating potential safety hazards caused by sight shielding. The utility model further provides polycrystalline silicon