Importance

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Abstract

The present invention discloses a gradient sub-boiling distiller and a distillation method. The gradient sub-boiling distiller includes a condensation pipe, an evaporation surface, a heating device, a liquid distributor, a tail liquid trough, a condensate trough, a tail liquid pipe, a liquid inlet pipe, a condensate pipe, and a shell. A raw material liquid is preheated through the condensation pipe, flows down from the evaporation surface after being further preheated in the heating device, and is continuously evaporated. With the temperature continuously decreasing, vapor condenses on the surface of the condensation pipe, the heat of condensation preheats the raw material liquid in the condensation pipe, and the flow direction of the raw material liquid in the condensation pipe is opposite to that on the evaporation surface. The present invention completely recovers the heat of condensation, increases the energy efficiency, reduces water for water-cooling, saves water resources and reduces energy consumption.

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First Claim