SU1613131A1 - Apparatus for degassing liquids - Google Patents

Abstract

The invention relates to devices for separating finely dispersed gases from liquids, in particular for degassing polymer solutions used to form films and membranes and having increased viscosity. The invention makes it possible to increase the efficiency of degassing such liquids. The device includes a housing 1 with a distribution element 4 rigidly connected to the float 11. The distribution element has a tapered or parabolic surface extending downwards and is installed in the central sleeve 3 with the possibility of free vertical movement. The size of the outflow gap is controlled by moving the cup 6, which is installed coaxially with the sleeve 3 and the element 4. The distribution element 4 has a cavity 12 for circulating a heat transfer medium. An oscillator with radiating plate 14 is located in the cavity of element 4. The deaerated liquid enters the cavity of the cone-shaped partition 2 and flows through element 4 first vertically downward, then spreads along its expanding part, looses speed and becomes thinner. In this case gas bubbles are emitted from it. The flow into the cavity 12 of the coolant and the message element 4 vibration intensify the degassing process. 4 hp f-ly, 2 ill.

Description

The invention relates to devices for separating finely dispersed gases from liquids and can be applied in the chemical, petroleum, energy, and other grains, especially for degassing viscous liquids.

The aim of the invention is to ensure the efficiency of degassing viscous liquids.

FIG. 1 shows a device, a longitudinal section; in fig. 2 — node I in FIG. one.

The device for degassing includes a housing 1 with a cone-shaped partition 2. A bushing 3 is installed on the baffle, in which the shank of the distribution element 4 is coaxially disposed. The bushing 3 has internal annular shoulder 5. Coaxially with the bushing 3

a cup 6 is installed, having a conical section 7 in the lower part, which forms an annular gap of outflow 8 with 6 coats 5. The cup 6 is connected with a mechanism of vertical movement, for example, a screw pair 9. The distributor element 4 is installed in a cup 6 with the possibility of vertical. movement. The lower part of the distribution element 4 is made with an expanding conical or parabolic (concave) surface and has a diameter Dy slightly smaller than the inner diameter of the housing D ,,, so that the distribution element almost completely crosses the cross section of the apparatus. the cross section formed between the wall of the housing and the distribution element of the gap 10 was twice the maximum cross section of the annular outflow gap 8 (with the upper position of the cup 6). Under the distribution element 4, a chamber 11 is rigidly connected to the floor and has a positive buoyancy (float).

The distribution element may have a cavity 12 for supplying a heat transfer fluid. In the cavity 12 of the distribution element an oscillator 13 may be located connected to the radiating plate 14,

The housing of the device has fittings 15 for supplying coolant, 16 for removing the coolant, 17 introducing cable 18 to the oscillator 13, 19 for introducing the degassed liquid, 20 evacuating the degassed liquid and 21 rasa extraction (vacuum gassing),

Under the liquid inlet fitting 19, a guide chute 22 is installed, the Fittings t5 and 16 are connected to the cavity of the element by 4 flexible hoses 23,

A device for degassing liquids works as follows.

The decontaminated liquid enters the body. Through fitting 19 and through the tray 22 flows into the cavity of the cone-shaped partition 2, the size of the outflow gap 8 is set by moving the cup 6 by means of the mechanism 9 ,. depending on the viscosity of the solution, its temperature and other parameters. Since there is no liquid in the lower part 24 of the housing 1, the float 11 and the distributor element 4 rigidly connected with it occupy the lowest position.

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The stack over the cylindrical part of element 4, the liquid falls on its lower part with an expanding surface. Spreading over it, the liquid gradually increases its surface, while the thickness of the liquid layer is significantly reduced. The gas bubbles in the thin layer are destroyed and separated from the liquid. The direction of movement of the fluid becomes almost horizontal, the speed decreases. Due to the easy evacuation of the gas released from the film, it is sucked away through the nozzle 20, the deaerated liquid in the laminar flow flows into the gap 10 between the housing 1 and the element 4, and the dimensions of the gap provide a full passage of the total volume of the draining liquid.

As the level of liquid increases, the float 11, together with the distribution element 4, float, and the entire volume of deaerated liquid in the lower part of the device is isolated by the surface of the float and the element from the re-absorption of gas bubbles, for example, when striking blown drops or jets of surface liquids

To increase the efficiency of degassing viscous liquids, coolant is directed into the cavity of the distribution element. When the deaerated liquid comes into contact with the heated surface of the element 4, its viscosity decreases. By adjusting the temperature and flow rate of the coolant, it is possible to achieve optimal operating conditions of the device with different types of polymer solutions and the desired degree of degassing. For some liquids, prolonged overheating is undesirable before the stage of forming films or membranes from them. In this case, the float serves as an isolating screen from the heated surface of the distribution element and helps to maintain the optimum temperature of the solution volume collected in the lower part of the device.

Additionally, the degassing process is activated by switching on an oscillator 13, driven, for example, by magnetostriction, magnetoelectric, etc. ycTpoi-icTBOM (not shown), which can carry out vibrations with the possibility of beating the amplitude and frequency.

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The fluctuations reported to the distribution element contribute to more rapid separation of gas bubbles from the liquid, i.e. increase the effect of degassing. As the deaerated liquid accumulates in the lower part 24 of the device, it is discharged through a pulverizer 20. The device can operate both in periodic and in continuous mode.

The choice of the gap between the distribution element and the device body equal to 1.5-2.5 annular gap of the expiration gap is based on the results of experimental verification of the operation of the device layouts on real polymer solutions, which require deaeration. With gaps smaller than the specified range, the deaerated polymer solution accumulates in the gap and does not have time to penetrate into the space under the distribution element, which leads to a malfunction of the device.

The results of testing the layout of the device are shown in the table.

The experiments were carried out on the apparatus, the diameter of the inner part of which is equal to 520 mm. A solution of poly-i-phenylene isophthalamide in dimethylacetamide (the concentration of the polymer is 8% with the addition of 1-, 5% of copper chloride) is used as a molding polymer solution. The pressure inside the apparatus was Pa.

An analysis of the results shown in the table shows that even when the gap between the distribution element and the inner surface of the housing exceeds the range of 1.5–2.5, a de-aperture of polymer solution is observed.

In the case of a smaller value (1.4), the deaerated solution is more difficult to penetrate into the gap and accumulates on the surface of the distribution element until under the action of the buoyancy force (created by the positive buoyancy of the distribution element) its ascent occurs. Until dynamic equilibrium is restored, the polymer solution, already dehydrated, loses solvent upon exposure to temperature and reduced pressure.

laziness, and on its surface forms a layer of a more concentrated solution, which is unacceptable.

If the gap is exceeded, for example, when the gap ratio is 2.6, the polymer solution dries out in the resulting gap on the inside of the housing at the same value, which is also unacceptable.

Thus, the use of the invention allows for the effective deaeration of solutions having high dynamic viscosity values.

Claims (4)

1. A device for degassing liquids, including a housing, a distribution element with an expanding conical or parabolic surface, mounted in a fixed central sleeve with the possibility of vertical movement, and means for changing the annular outflow gap, characterized in that the purpose of increasing the efficiency of degassing of viscous liquids, the device is equipped with a float installed under the distribution element and rigidly connected 0 five 0 five intersection element and housing distribution is 1.5–2 times larger than the maximum cross section of the annular gap of expiration 2. A device according to claim 1, characterized in that the central sleeve is made with a collar, and the means for changing the annular gap of the outflow is made in the form of a glass-related vertical movement mechanism having a conical section in the lower part for interaction with the collar. 3. A device according to 1, characterized in that it is provided with a cone-shaped partition, which is connected with a central sleeve. 4. The device according to p, 1, about t l and -. often in that the distribution element is made with a cavity for the supply of coolant 3. A device according to claim 1, characterized in that it is provided with an equator that is installed in the cavity of the distribution element. B5 2.10 0 98.0 The solution builds up on the surface of the dispenser. Same n -. - - Drying the solution on the inner wall of the housing Also The solution accumulates on the surface of the dispensing element, drying it Job steady Also  P Drying of the solution on the inner surface of the housing Also 23 sixteen 2 Fig.G FIG. g