A Design Method of Tray Structure for Eliminating Gas Phase Drift Flow

Abstract

The invention discloses a column plate structure capable of eliminating gas-phase deflected flow and a design method. The structure includes a mass transfer column plate, wherein a gas phase distribution plate is added to below the mass transfer column plate, thus forming a double-layer column plate structure. The distance from the gas phase distribution plate to the mass transfer column plate is20-300 mm. The gas phase distribution plate includes a non-holed zone, at one side, and a holed zone being the area except the non-holed zone. Horizontal baffles are formed on the holed zone of the gas phase distribution plate to separate the space, formed by the gas phase distribution plate and the mass transfer column plate, into several zones, wherein valve holes, in different numbers, are formed uniformly in each zones on the gas phase distribution plate, but the ratio of pore area of each zone to the area of each zone is equal. A part of the valve holes are provided with float valves. Thecolumn plate structure is simple and can effectively eliminate the forming condition of the gas-phase deflected flow and make gas-phase flow uniform. The structure greatly improves operating flexibility and separation efficiency.

Description

technical field [0001] The invention relates to a tray structure and a design method for eliminating gas phase bias flow, and belongs to the technical field of chemical vapor-liquid mass transfer and separation equipment. Background technique [0002] At present, despite the emergence of a variety of new separation technologies, distillation is still the most widely used separation technology in industry. Among them, the most widely used rectification operation mode is the tray column. When the liquid phase flows on the tray, due to the influence of frictional resistance, the liquid layer on the tray will form a liquid level drop, resulting in uneven distribution of the liquid phase on the tray, and then forming a gas phase bias flow on the tray, especially in large tray towers . Once the gas phase deviation occurs, a large amount of gas phase flows out from the tray outlet, causing a large amount of mist entrainment; secondly, no or only a small amount of gas phase passes...

AI Technical Summary

Problems solved by technology

Once the gas phase drift occurs, a large amount of gas phase flows out from the outlet of the tray, causing a large amount of mist entrainment; secondly, there is no or only a small amount of gas phase passing through the inlet of the tray, resulting in leakage at the inlet of the tray

This abnormal hydraulic phenomenon will not only significantly reduce the tray efficiency, but even induce tray flooding, affecting the normal operation of the column.

At present, some technologies such as multi-overflow trays, multi-downcomer trays and guided tray technologies can control the gas phase drift, but these technologies still have shortcomings: multi-overflow tray technology has complex design, especially with the increase of overflow number. There are disadvantages such as increase and long installation time; the efficiency of multi-downcomer trays is low; the technology of guided trays cannot cope with the conditions of high liquid / vapor ratio or lower limit operation of the distillation column

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