Heat exchanger for distillation

Abstract

The invention relates to a heat exchanger for distillation. The technical scheme is that: the heat exchanger consists of a shell pass and a tube pass, wherein in the shell pass, an upper cylinder body of the shell pass and a lower cylinder body of the shell pass are connected into one body by an expansion joint, both ends of the shell pass are connected with an upper tube plate and a lower tube plate, a heat exchange tube and a central tube pass a baffle plate, both ends of the heat exchange tube and the central tube are connected with the upper tube plate and the lower tube plate, the central tube is arranged on the axis of the upper tube plate and the lower tube plate, a baffle plate is fixed by a distance tube, a lower cylinder of the shell pass is provided with an exhaust and a steam outlet of the shell pass, an upper cylinder of the shell pass is provided with a steam exhaust and a steam inlet of the shell and a shock proof plate is arranged in the upper cylinder body of the shell pass; and in the tube pass, both ends of a lower tube pass cylinder body are connected with a lower tube pass flat cover and the lower tube plate by flanges, and the lower tube pass is provided with a tube pass exhaust and a material charge port; both ends of an upper tube pass cylinder body are connected with an upper flat cover and the upper tube plate by flanges, and the upper tube pass is provided with a material discharge port and a fixed gas discharge port; and the pads are arranged between the upper tube pass flanges and the upper tube plate and between the lower tube pass flanges and the lower tube plate. The heat exchanger is high in gasification rate and good in heat exchange effect.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a heat exchanger used in the acetic anhydride industry for distillation on an acetic acid tower for carbonylation of acetic acid from methanol. Background technique [0002] The heat exchanger for distillation is a special heat exchanger that can exchange heat and has a vaporization space, which can make the liquid heat up and vaporize again. It is generally used in distillation and evaporation equipment. Most of the heat exchangers for distillation are used together with the fractionation tower, and most of them are tower bottom heat exchangers. The material level in the heat exchanger is at the same height as the liquid level in the fractionation tower. The liquid phase is provided from the bottom of the tower into the heat exchanger. During the evaporation process, the material is heated and expanded or even vaporized in the heat exchanger. Usually, 20-25% of the liquid phase is vaporized i...

AI Technical Summary

Problems solved by technology

At present, most of the heat exchangers used by many manufacturers are fixed tube plate heat exchangers, floating head heat exchangers or U-shaped tube heat exchangers. The gasification rate of this structure is low, and the circulation volume between the heat exchanger and the fractionation tower is relatively large. , the load of the separation section is relatively high, which cannot be well applied in the technology of methanol carbonylation to acetic acid

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