The utility model belongs to the technical field of high-boiling-point substance concentration, and provides a
polycrystalline silicon high-boiling-point substance concentration
system which comprises a high-boiling-point substance concentration
tower, a
tower kettle
reboiler and a
tower kettle
buffer tank, the bottom of the high-boiling residue concentration tower is connected with a tower kettle
buffer tank through an extraction pipeline; the bottom of the tower kettle
reboiler is communicated with an extraction pipeline through a
thermosiphon pipeline; and the upper part of the tower kettle
reboiler is communicated with the high-boiling residue concentration tower through an upper pipeline. And the top of the tower kettle
buffer tank is communicated with the middle part of the high-boiling residue concentration tower through a
gas phase balance pipeline. According to the utility model, the
thermosiphon pipeline of the tower kettle reboiler is arranged at the upper part of the extraction pipeline at the lowest point of the tower kettle of the high-boiling residue concentration tower, so that the problem that the tower kettle reboiler and the tower kettle pipeline are blocked when the high-boiling tower kettle is concentrated is solved. The concentrated high-boiling-point substances and the like enter a tower kettle buffer tank through an extraction pipeline, one part of the high-boiling-point substances in the tower kettle buffer tank are conveyed to the high-boiling-point
cracking reaction kettle through a pump, and the other part of the high-boiling-point substances return to the high-boiling-point substance concentration tower kettle through a pump return pipeline, so that the liquid level of the high-boiling-point substance concentration tower kettle is maintained.