Flange heat preservation assembly and steam conveying pipeline thereof

The utility model discloses a flange heat preservation assembly and a steam conveying pipeline thereof. The flange heat preservation assembly comprises two pipelines, a flange connected with the two pipelines, a side end sealing part and an annular sealing part. Wherein the side end sealing parts are formed by winding heat insulation strips around the outer wall of the pipeline in the circumferential direction of the pipeline, the outer diameters of the side end sealing parts are equal to the outer diameter of the flange, the side end sealing parts and the flange are concentrically arranged, the number of the side end sealing parts is at least two, and the left and right sides of the flange are each provided with at least one side end sealing part; the annular sealing part is formed by winding a heat insulation strip in the circumferential direction of the pipeline, covers the outer side of the flange and at least partially covers the outer side of the side end sealing part. Accordingto the flange heat preser