Double-layered spiral channel jacket layer

The invention discloses a double-layered spiral channel jacket layer. The double-layered spiral channel jacket layer wraps the outer wall of the barrel body of a reaction device and comprises an inner-layer spiral channel and an outer-layer spiral channel, wherein the clearance between the outer wall of the barrel body and the inner wall of the inner-layer spiral channel forms the inner-layer spiral channel, and the inner-layer spiral channel comprises a first connection pipe port and a second connection pipe port; the clearance between the outer wall of the inner-layer spiral channel and the inner wall of the outer-layer spiral channel forms the outer-layer spiral channel, and the outer-layer spiral channel comprises a third connection pipe port and a fourth connection pipe port; a heat-conducting medium can flow in the inner-layer spiral channel and the outer-layer spiral channel. By adopting the double-layered spiral channel jacket layer disclosed by the invention, temperature difference between medium inlet and outlet is reduced, and temperature difference between the medium and the wall surface of the inner barrel of the jacket is reduced, so that temperature distribution of the wall surface of the inner wall is relatively uniform, irreversible loss of the medium and the temperature of the wall surface of the inner barrel is reduced, and the utilization rate of heat energy is improved.