CN203678000U - Device for controlling phase interface height in liquid-liquid phase extraction tower - Google Patents

Abstract

The utility model discloses a device for controlling phase interface height in a liquid-liquid phase extraction tower. The device is characterized by comprising an inverted U-shaped pipe (1), wherein a first movable joint (2) is connected at one end of the U-shaped pipe (1); the other end of the U-shaped pipe (1) is connected to one end of a T-branch pipe (4) through a second movable joint (3). According to the device disclosed by the utility model, on the basis of hydrostatics and a siphon principle, a phase interface is automatically controlled by controlling outputted liquid. The device disclosed by the utility model is free from a mechanical moving part and free from electric and pneumatic components; moreover, the device has a certain self-balancing function on slight fluctuation of a process system.

Description

A kind of device that boundary height in liquid liquid-phase extraction tower is controlled

Technical field

The utility model relates to a kind of device that boundary height in liquid liquid-phase extraction tower is controlled.

Background technology

At present, the control of extraction tower boundary has mechanical type, pneumatic type and electrodynamic type.Wherein mechanical type acts frequently because of its executing agency, easy to wear, corrosion and bite fault often occurs.Pneumatic type and electrodynamic type are made up of the pneumatic or electric control valve on the level meters at boundary place and heavy phase discharge pipe conventionally.When interface is during lower than controlling value, by level meters output control signal, turn down control valve, reduce heavy phase extraction, interface is raise.Otherwise when interface is during higher than controlling value, by level meters output control signal, drive large control valve, increase heavy phase and discharge, interface is raise.This control system complex structure, involve great expense, large in the type selecting difficulty of poor hour level meters of weight phase density.In addition, because electric, pneumatic components and parts and line fault can make liquid level out of control, have a strong impact on the quality and quantity of security, economy and the product of being adjusted object.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of device that boundary height in liquid liquid-phase extraction tower is controlled is provided

The technical solution of the utility model is summarized as follows:

The device that boundary height in liquid liquid-phase extraction tower is controlled, comprises inverted U pipe 1, and one end of U-shaped pipe 1 is connected with the first active joint 2, and the other end of U-shaped pipe 1 is connected with one end of three-way pipe 4 by the second active joint 3.

The utility model, based on hydrostatics and siphon principle, is realized the automatic control to boundary by the control to output liquid.The utility model machinery-free moving component, without electric, pneumatic components and parts, and has certain self-balance effect to the minor fluctuations of process system.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is use view of the present utility model.

The specific embodiment

Below in conjunction with accompanying drawing, structure of the present utility model and operation principle are elaborated.

The device that boundary height in liquid liquid-phase extraction tower is controlled, comprises inverted U pipe 1, and one end of U-shaped pipe 1 is connected with the first active joint 2, and the other end of U-shaped pipe 1 is connected with one end of three-way pipe 4 by the second active joint 3.See Fig. 1.

Use of the present utility model:

In Fig. 2,5 is heavy phase inlet tube, and 6 is light phase inlet tube, and 7 is light phase discharge pipe, and 8 is heavy phase discharge pipe, and 9 is tower top blow-down pipe, and 10 is boundary.

The first active joint 2 in the utility model is connected with heavy phase discharge pipe 8 in liquid liquid-phase extraction tower, inverted U pipe 1 can, along the axial-rotation connecting, be regulated the position of liquid liquid-phase extraction Ta Tanei boundary 10.

Two other interface of three-way pipe 4, it is suitable for reading is connected with the tower top blow-down pipe 9 that is connected to liquid liquid-phase extraction column overhead, and end opening is heavy phase flow export, duplicate removal phase collecting tank.

The diameter of heavy phase discharge pipe is to be determined by the treating capacity of liquid liquid-phase extraction tower, the diameter of inverted U pipe 1 and three-way pipe 4 is more than heavy phase discharge pipe diameter twice, as 2.5 times or 3 times etc., to guarantee that liquid flows at inverted U Guan Zhongwei semicanal, make gas enter inverted U pipe by tower top blow-down pipe and three-way pipe, avoid producing siphonage and cause liquid-liquid interface fluctuation in liquid liquid-phase extraction tower.

After liquid liquid-phase extraction tower has designed, need, according to separating technology requirement, determine the position of boundary, and design corresponding interface control system, this interface location is controlled, to guarantee the time of staying of two-phase in tower, and then guarantee separating effect.Adopt device provided by the utility model can realize this purpose.

The overflow height of liquid liquid-phase extraction tower weight phase discharge pipe can be determined by following formula:

$h_1=\frac{\mathrm{h\&rho;}+{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000423722890000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_2{\mathrm{\&rho;}}_2}{{\mathrm{\&rho;}}_1}---\left(1\right)$

Wherein:

H ₁: the overflow height of heavy phase discharge pipe, mm; (inverted U pipe highest point and 6 difference in height)

ρ ₁: heavy phase density, kg/m ³;

H ₂: light phase height of liquid layer, mm; (7 and 10 differences in height)

ρ ₂: light phase density, kg/m ³;

H: two phase mixture height, mm; (10 and 6 differences in height)

ρ: two phase mixture averag densities, kg/m ³;

Embodiment:

Produce take acetylene as raw material in the process of vinyl acetate, the vinyl acetate distillate that is rich in acetaldehyde in rectifying centrifugal station need be removed acetaldehyde wherein through liquid liquid phase extraction tower.Through process design and calculation, this liquid liquid-phase extraction tower tower diameter 450mm, material clear height 7000mm in tower, wherein two phase mixture height 5000mm, light phase height of liquid layer and the each 1000mm of heavy-phase liquid layer height.This system heavy phase density 987.7kg/m ³, light phase density 932.0kg/m ³, two phase mixture averag density 983.1kg/m ³.Heavy phase discharge pipe caliber is 50mm.In can being calculated by above formula, heavy phase discharge pipe overflow height is 5920mm, namely heavy phase discharge pipe top is arranged than the height of the low 80mm of tower top liquid level (liquid level position in the determined tower in light phase discharge pipe position), boundary can be controlled in to 1000mm place under tower top liquid level (being light phase height of liquid layer 1000mm).

Adopt device provided by the utility model, the height of the inverted U tube portion of heavy phase discharge pipe is 500mm, and the caliber of inverted U pipe and threeway part is 100mm, and making wherein liquid is semicanal, guarantee that the gas in balance pipe is communicated with inverted U pipe, avoid producing siphon scene and cause liquid fluctuating in tower.In inverted U peak and tower, light phase discharge pipe is in same level.

After device charging, can be rotated inverted U pipe, go to its height and can realize the interface location control of technological requirement lower than peak 80mm.

Improve when producing load, in two-phase section, light phase fraction increases, and two phase mixture averag densities are reduced to 977.8kg/m ³require light phase height of liquid layer to be increased to 1500mm simultaneously, can calculate heavy phase discharge pipe height is 5870mm, namely heavy phase discharge pipe top is arranged than the height of the low 130mm of tower top liquid level, can continue to rotate inverted U pipe to realizing technique adjustment lower than peak 130mm.

Active joint in of the present utility model can be gland sealed socket fitting type structure, can be also lap joint flange.

Claims (1)

1. the device that the boundary height in liquid liquid-phase extraction tower is controlled, it is characterized in that comprising inverted U pipe (1), one end of U-shaped pipe (1) is connected with the first active joint (2), and the other end of U-shaped pipe (1) is connected with one end of three-way pipe (4) by the second active joint (3).

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