Liquid-accommodation diversion type drop pipe

Abstract

The invention discloses a liquid-accommodation diversion type drop pipe comprising a pipe body, overflow weirs, single-stage or multiple-stage liquid accommodating chambers clinging to the tower wall and pipe wall, liquid accommodating plates of the bottom of the pipe body and drop plates. According to the drop pipe, the liquid phase and gas phase flowing and contacting state in a tower is changed, the gas and liquid contacting and separating strength is enhanced, the purposes of improving the tower distillating efficiency and operational flexibility and increasing the tower flux can be achieved, the tower blockage prevention capability is improved, the tower plate pressure drop is reduced, energy consumption and equipment investment are reduced, and the comprehensive performances of the tower are improved.

Description

technical field [0001] The invention belongs to the technical fields of oil refining, chemical industry, biology and medical equipment, and in particular relates to a downcomer structure of an internal component of plate tower equipment. Background technique [0002] Columns are one of the most basic equipment in oil refining, chemical, biological, pharmaceutical and other industries, and are necessary process equipment for chemical unit operations such as distillation, fractionation, rectification, absorption and extraction. According to the different internal structures, the tower can be divided into packed tower and plate tower, which are suitable for different working conditions and process tasks. In addition to the through-flow structure, the plate tower includes internal components such as trays and downcomers to realize the countercurrent contact and separation of the gas-liquid two-phase, and use the difference in relative volatility (extraction towers use the solubi...

AI Technical Summary

Problems solved by technology

[0010] 1) The existence of outflow resistance makes it difficult for the liquid phase in the tube to flow out. In some special cases, such as when the pressure drop of the tray gradually increases, the flooding phenomenon is very easy to occur, which seriously affects the stable production and the efficiency of the whole tower

[0011] 2) At the same time, the outflow resistance slows down the flow rate of the liquid phase flowing into the tray from the downcomer, which is prone to precipitate and block the tray, resulting in an increase in the pressure drop of the tray, increased energy consumption of the tower equipment, and cannot be operated for a long period of time

[0012] 3) The flow rate of the liquid phase on the plate is relatively slow, which cannot effectively suppress the mist entrainment phenomenon

The essential gas phase entrained by the mist bubbles in the liquid layer due to its high energy, and the bubbles burst rapidly, causing the liquid to break into splashed droplets, which are brought to the upper tray by the rapidly rising gas phase to form a liquid phase in the tower. Back-mixing between plates greatly reduces the efficiency of the whole tower, which is easy to occur under large flux and special working conditions, which seriously limits the load of the whole tower

[0013] 4) The flow rate of the liquid phase flowing into the tray from the downcomer is relatively slow, which is prone to liquid level gradient problems

When the flux of the whole tower increases, the height of the clear liquid layer in the tube becomes lower, and it is easy to bring air bubbles into the lower tray. Even if the gas phase back-mixing in the tower is intensified, the efficiency of the whole tower will be greatly reduced

[0015] 6) Due to problems such as slow flow rate, easy precipitation, and liquid level gradient, the liquid phase flow on the tray is complicated, and the gas-liquid two-phase contact cannot always be maintained under optimal conditions, which makes the separation efficiency of the tray lower than that of the theoretical plate. , in the existing structure, it is necessary to increase the proportion of the area of ​​the tray to the cross-section of the column to make up for the lack of efficiency, so that the proportion of the cross-sectional area of ​​the downcomer is relatively low, which affects the total tower flux and equipment costs, etc.

However, combined with the flow pattern on the tray, the overall improvement of the structure of the downcomer has not been found.

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