Energy-saving distillation method and device through differential pressure column section heat integration in rectification column sequences

Abstract

The invention relates to an energy-saving rectification device and method through differential pressure column section heat integration in rectification column sequences. The device comprises a light component boil-up column, a light component refining column rectification column section, an auxiliary condenser, a return tank, a flash tank, a light component refining column stripper section, an auxiliary reboiler and a main reboiler, wherein the light component boil-up column is used for pressurizing the light component refining column rectification column section; a top saturated vapor outlet pipe of the light component refining column rectification column section is connected to the heat media inlet of the main reboiler; the heat media outlet of the main reboiler is connected to the inlet of the auxiliary condenser; a bottom liquid outlet pipe is connected to the inlet of the return tank; a bottom liquid outlet pipe of the light component refining column stripper section is connected to the cold media inlet of the auxiliary reboiler and the cold media inlet of the main reboiler respectively; and the cold media outlets of the auxiliary reboiler and the main reboiler are respectively connected to a reboiled vapor inlet pipe of the light component refining column stripper section. The invention realizes single-column heat integration and matched heat exchange in the rectification column sequences. The invention realizes minimum heat consumption of the single column through differential pressure column section heat integration, even ensures the cold and heat load to be perfectly matched and ensures zero consumption, thus greatly reducing energy consumption of the system and achieving the aims of energy saving and synergy.

Description

technical field [0001] The invention relates to the technical field of rectification and a rectification tower system, in particular to a heat-integrated energy-saving rectification device and method for differential pressure tower sections of a rectification tower sequence. Background technique [0002] Distillation is the most widely used industrial separation method in contemporary times, and has been widely used in chemical industry, petroleum, food, light industry and other industrial sectors. Although the development of science and technology, new separation technology has begun industrial application, but in a certain period of time, the dominance of rectification technology cannot be shaken. [0003] Distillation separation technology is mature and easy to industrialize, but the disadvantage is that it consumes a lot of energy. For traditional distillation and separation, the input energy consumption accounts for more than 40% of the total industrial energy consumpt...

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Problems solved by technology

[0005] For the existing multi-component separation conventional distillation sequence such as figure 1 As shown, when separating difficult-to-separate systems, the number of theoretical plates required is large, resulting in a large height of the tower; the operating reflux ratio of the required tower is large, resulting in a large diameter of the tower body, and the reboiler at the bottom of the tower The required heat load and the condensation load required by the overhead condenser are larger, so the energy consumption of the tower is higher and the operating cost is also higher

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