A vertical tube falling film evaporation device coupled with gas-liquid path separation

By incorporating a thickened outer circumferential wall and a spiral liquid inlet channel within the liquid distributor connector, the problems of uniform liquid distribution and gas-liquid separation in vertical pipe falling film evaporators are solved, thereby improving heat transfer efficiency and the purity of gaseous products, extending the equipment's operating cycle, and making it suitable for applications in chemical, pharmaceutical, and food industries.

CN122124481APending Publication Date: 2026-06-02DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Filing Date
2026-04-20
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing vertical tube falling film evaporators suffer from insufficient liquid distribution uniformity, resulting in localized dry walls, low heat transfer efficiency, poor gas-liquid separation, and severe mist entrainment, which affects product quality and equipment operating cycle.

Method used

A vertical tube falling film evaporator with coupled gas-liquid path separation is designed. By setting a thickened outer peripheral wall and a spiral liquid inlet channel in the liquid distributor pipe, the material can form a continuous and complete liquid film in the heat exchange tube. The gas-liquid path separation is achieved through the gas outlet channel and the spiral liquid inlet channel, avoiding back-current interference between vapor and liquid film.

Benefits of technology

It improves heat transfer efficiency, prevents materials from overheating and deteriorating, extends equipment operating cycle, increases the purity of gaseous products, and reduces the load on subsequent separation and purification processes. It is suitable for industrial applications in chemical, pharmaceutical, and food industries.

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Abstract

This invention belongs to the technical field of evaporation separation equipment, and particularly relates to a vertical tube falling film evaporation device with coupled gas-liquid path separation. It includes a vertically arranged shell closed at both ends, with at least one heat exchange tube inside the shell. An upper end cap is connected to the top of the shell, and a lower end cap is connected to the bottom. The lower end cap communicates with the heat exchange tube. A liquid distribution and separation buffer chamber is formed between the upper end cap and the top of the shell, and a liquid distributor communicating with the heat exchange tube is provided inside the chamber. The liquid distributor includes a liquid distributor connecting pipe, the interior of which is an outlet channel. A thickened outer circumferential wall is provided at the top of the heat exchange tube in the lower circumferential direction. Multiple spiral liquid inlet channels are evenly spaced on the outer side of the thickened outer circumferential wall. The top of the channels communicates with the liquid distribution and separation buffer chamber, and the bottom communicates with the heat exchange tube, with the side openings blocked by the inner wall of the heat exchange tube. The material forms a liquid film through the spiral liquid inlet channels. After the heat exchange medium heats the material, the evaporated gas is discharged through the outlet channel, and the concentrated material enters the lower end cap, achieving efficient gas-liquid separation and uniform liquid distribution.
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