Differential pressure type thermal coupling rectification device

Abstract

The invention discloses a differential pressure type thermal coupling rectification device. The device comprises an atmospheric tower equipment group and a vacuum tower equipment group, wherein the atmospheric tower equipment group comprises an atmospheric tower body and all atmospheric equipment which is connected with one another through pipelines; a plurality of extensible baffles are arranged on the inner wall of the atmospheric tower body; the expansion of the baffles is controlled through a flow meter arranged in the atmospheric tower body; the vacuum tower equipment group comprises a vacuum tower body and all vacuum equipment groups connected with the vacuum tower body; a liquid distributor is arranged on the inner wall of the vacuum tower body. The device adopting the structure can obtain high-purity products, cancels steam in the conventional sense, applies energy at the top of a prior tower to the evaporation of a second tower, can save the steam amount for a rectifying tower, and realizes energy saving, moreover, as an atmospheric tower and a vacuum tower are respectively provided with two sets of pipelines, when any one of the atmospheric tower or the vacuum tower breaks down, standby pipelines can be started, shutting down due to equipment failure cannot occur, and the production efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of rectification, in particular to a differential pressure thermal coupling rectification device. Background technique [0002] Rectification is a distillation method that uses reflux to obtain high-purity separation of liquid mixtures. The key to the complete separation of liquid mixtures in rectification lies in the application of reflux. The reflux includes both a liquid with a high concentration of volatile components at the top of the column and a vapor with a high concentration of less volatile components at the bottom of the column to return to the column. The vapor-liquid reflux forms a vapor-liquid two-phase in countercurrent contact, so that relatively pure single-component products are obtained at both ends of the tower, but the rectification process consumes a lot of energy. The earliest thermocouple rectification was proposed by Petlyuk 50 years ago Yes, research has found that thermocouple rec...

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Problems solved by technology

The vapor-liquid reflux forms a vapor-liquid two-phase in countercurrent contact, so that relatively pure single-component products are obtained at both ends of the tower, but the rectification process consumes a lot of energy. The earliest thermocouple rectification was proposed by Petlyuk 50 years ago Yes, research has found that thermocouple rectification saves at least 30% more energy than conventional rectification processes, but it is difficult to industrialize due to the technical conditions at that time. With the improvement of control technology, the research on thermocouple rectification tends to be active again, but in the production process, although the method of differential pressure coupled rectification is used for purification, one feed port is used, and the rectification tower mostly adopts a single fixed Tray type, high pressure difference, high energy consumption, unable to obtain high-purity rectified substances, and its own structure leads to large steam consumption, seriously affecting production costs, and can no longer meet the needs of current technological development

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