Cis-reverse pipe warming system for steam-water pipeline

The invention relates to a cis-reverse pipe warming system for a steam-water pipeline, and belongs to the technical field of regional heat supply systems in mechanical engineering. The system involvesa steam-water main pipeline, a hydrophobic mother pipe, a cooling water pipe, a steam heating pipe, a hydrophobic expansion tank and a hydrophobic recovery tank, wherein the two ends of the steam-water main pipeline are provided with a steam-water inlet valve and a steam-water steam supply valve correspondingly, a plurality of hydrophobic branch pipes are connected between the steam-water main pipeline and the hydrophobic mother pipe in parallel in a communicating mode, the steam-water main pipeline is provided with a steam-water steam supply valve front hydrophobic pipe communicating with the hydrophobic recovery tank, one ends of the hydrophobic mother pipe, the cooling water pipe and the steam heating pipe penetrate into the hydrophobic expansion tank, outlets of the ends of the hydrophobic mother pipe, the co