Polycrystalline silicon production system and polycrystalline silicon production method

The present invention provides a polycrystalline silicon production system and a polycrystalline silicon production method. The polycrystalline silicon production system comprises a reduction furnace and a tail gas heat exchanger, wherein the reduction furnace and the tail gas heat exchanger are connected through a first tail gas pipeline, a tail gas output pipeline is connected to the tail gas heat exchanger, the system further comprises a second tail gas pipeline, and the second tail gas pipeline is respectively connected to the first tail gas pipeline and the tail gas output pipeline. According to the present invention, the second tail gas pipeline can shunt the tail gas in the first tail gas pipeline, can make the tail gas in the second tail gas pipeline be not subjected to heat exchange with the material, can reduce the temperature of the tail gas in the first tail gas pipeline, and can correspondingly reduce the heat resource of the tail gas heat exchanger so as to reduce the feeding temperature of the mixing gas in the material conveying pipeline, eliminate the high temperature running safety risks of the first tail gas pipeline and the material conveying pipeline, inhibit the atomization effect, improve the polycrystalline silicon product quality, control the tail gas temperature without the material reducing and the current reducing, and improve the polycrystalline silicon deposition rate, such that the production efficiency can be improved, the energy can be saved, the consumption can be reduced, and the production cost can be reduced.