RU2622656C1 - Contact-separation element - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: contact-separation element includes a housing, a gas-liquid flow swirler, a film separator, a liquid supply pipe, an annular gap formed in the wall of the housing for discharging the separated liquid, and a displacer. The annular gap is located in the upper part of the housing between the liquid supply tube and the foil spacer. A separating nozzle is installed outside the annular gap.

EFFECT: increasing the efficiency and reliability of separation and mass exchange equipment, reduction of secondary liquid carryover, reduction of weight and size characteristics and reduction of metal consumption of the equipment used.

4 cl, 1 dwg

Description

The invention relates to the field of gas purification from liquids, solids and salt solutions in gas, oil and petrochemical industries and can be used in gas and oil fields in the processes of separation and mass transfer (rectification, absorption).

A device for contacting gas and liquid (patent for the invention No. 1149475 SU, publ. 01/15/1994), comprising a housing, swirl, film, tube for supplying liquid, a displacer located above the tube for supplying liquid.

The disadvantage of this mass transfer device is the low efficiency of gas-liquid separation due to the small diameter of the casing (in practice, contact elements with a casing diameter of 60 mm are used), which is not enough to create the necessary centrifugal force. This leads to secondary entrainment and increased removal of fluid and solids from the separator or to higher separation stages and reduce the reliability of the equipment as a whole.

A known centrifugal separator with a separation element (patent No. 1619528 RU, publ. 15.01.1994), which includes a housing, a swirler, a film remover, a displacer, a gas recirculation tube, an annular gap located between the swirler and the gas recirculation tube. The use of an annular gap increases the separation efficiency.

The disadvantage of this separation element is its narrow specialization and unsuitability of use in mass transfer processes and in gas purification from salt solutions due to the inability to supply absorbent (flushing fluid) inside the element body.

The technical task is to create a combined universal device, namely, a contact separation element, which can improve the reliability and efficiency of separation and mass transfer equipment when cleaning gas from liquids, solids and salt solutions.

The problem is solved by the present invention, according to which the contact separation element, comprising a housing, a swirl of gas-liquid flow, a film stripper, a tube for supplying liquid, a displacer, an annular gap made in the wall of the housing to drain the separated liquid, has distinctive features, which are next. An annular gap is located in the upper part of the housing between the liquid supply tube and the film stripper, while a separation nozzle is installed outside the annular gap.

Also, the contact separation element and / or its individual structural features may have a private form of execution, such as:

- separation nozzle is made in the form of a fine mesh;

- the contact separation element comprises a gas recirculation tube located between the liquid supply tube and the annular gap;

- a displacer is located above the gas recirculation tube.

The technical result obtained from the invention consists in a significant reduction in the secondary ablation of a liquid, a decrease in weight and size characteristics, and a decrease in the metal consumption of the equipment used.

The invention is explained in more detail using the drawing, which shows a sketch of the contact separation element.

The contact-separation element is mounted on the plate 1, placed in the apparatus (for example, separation or mass transfer), and includes a housing 2, a swirler 3, in the lower part of the housing there is a liquid supply pipe 4 having a central slot, a gas recirculation pipe 5, a displacer 6, a film stripper 7 is mounted in the upper part of the housing 7. Between the fluid supply pipe 4 and the film stripper 7, an annular gap 8 is located in the upper part of the housing; a separation nozzle 9 is installed outside the annular gap, which can be It is filled, for example, from a fine mesh. The gas recirculation pipe 5 can be installed between the liquid supply pipe 4 and the annular gap 8. The displacer 6 can be located above the gas recirculation pipe 5 and is made, for example, as a part of a sphere convex towards the flow.

Contact separation element operates as follows.

The gas-liquid mixture enters the housing 2 of the contact separation element through the swirler 3, where it acquires rotation. In a swirling gas stream, zones with different static pressures are formed. A zone of reduced pressure is formed in the axial region, a zone of increased pressure is formed at the element body. Through a central slot in the fluid supply pipe 4, due to the reduced pressure in the axial zone of the element, the absorbent (flushing liquid) is injected from the web of the plate 1 into the housing 2 of the contact separation element. The absorbent received through the fluid supply pipe 4 into the housing 2 from a rotating gas stream acquires a centrifugal rotational movement, due to which it is uniformly mixed with the main gas-liquid stream. Due to centrifugal force, the main part of the fluid is pushed to the wall of the element. Further, the rotating gas-liquid flow is additionally related by the displacer 6 from the axial zone of the element to the inner wall of the housing 2 and is partially withdrawn from the element through the annular gap 8, where coagulation of the liquid discharged from the element occurs on the mesh separation nozzle 9. The remaining liquid in a swirling stream enters the film stripper 7 and is discharged from the element. The gas that has fallen into the annular cavity between the apparatus body and the contact separation element is sucked into the element through the gas recirculation tube 5. The gas purified from the liquid enters the upstream separation (absorption) stage or is removed from the apparatus.

The relative position of all the structural features of the new contact separation element, according to the present invention, determines its versatility and versatility, moreover, compares it favorably with previously known analogues.

Namely:

- the location of the annular gap in the upper part of the housing between the fluid supply tube and the film stripper provides the manifestation of mass transfer properties of the contact separation element and contributes to the optimal contact time of the gas with the liquid necessary for effective mass transfer;

- the use in the design of the contact-separation element of the annular gap located on the element’s body between the liquid supply tube and the film stripper, contributes to the removal of most of the liquid (of its total amount) transferred to the film due to centrifugal force after the swirl, which ensures the manifestation of its separation properties;

- a separation nozzle mounted outside the annular gap serves to coagulate the discharged fluid, which significantly reduces the possibility of its secondary entrainment;

- an additionally installed gas recirculation tube reduces the thickness of the liquid film, which helps to increase the gas velocity in the element and its productivity;

- installation in the axial zone of the element above the gas recirculation tube of a displacer, made, for example, as a part of a sphere convex towards the flow, forces the droplets of liquid remaining in the center of the stream to be displaced to the inner wall of the element and to further withdraw in the form of a film from the element through the annular gap and film stripper.

The proposed contact separation element was created for use in newly developed equipment, as well as for the modernization of previously existing mass transfer and separation equipment.

To determine the range of effective operation of the modernized separator, a contact separation element was manufactured and installed in a separator with a flushing section, which, as part of a gas dehydration unit, was tested in the gas field of the Yamburgskoye oil and gas condensate field.

The tests were carried out at a current pressure of 0.81-0.83 MPa, a gas temperature of 3.3-5.06 ° C, gas flow rates from 130 to 180 thousand m ³ / h, with and without flushing fluid.

During the tests, positive results were obtained. The main significant indicators characterizing the effective operation of the equipment were such as the pressure drop across the separator, the mass concentration of dropping liquid in the purified gas at the outlet of the separator, and the content of solids in the purified gas at the outlet of the separator. In the entire investigated range of gas productivity, the values of these criteria did not exceed the permissible ones and corresponded to the technical requirements.

The proposed technical solution has positive factors from its use. This is due to the following. In existing multifunctional devices, for example, an inlet separator-stripper, several sections are sequentially installed, including a mass transfer section consisting of several plates with centrifugal mass transfer elements, and then an end separation section based on centrifugal separation elements. The use of such a contact separation element of the present invention, which simultaneously performs the function of mass transfer and separation, allows you to combine several sections in one, this affects the reduction of the overall dimensions of the separation and mass transfer equipment, and, consequently, the reduction of its metal consumption.

The contact separation element is simple in design and does not require significant material costs for its manufacture, its use in separation and mass transfer equipment allows to achieve higher rates for gas purification from liquids.

Thus, the present invention solves the problem of improving the efficiency and reliability of mass transfer and separation equipment.

Claims (4)

1. Contact-separation element, comprising a housing, a swirl of gas-liquid flow, a film strip, a tube for supplying liquid, a displacer, an annular gap made in the wall of the housing to drain the separated liquid, characterized in that the annular gap is located in the upper part of the housing between the feeding tube liquid and a film stripper, while a separation nozzle is installed outside the annular gap. 2. Contact separation element according to claim 1, characterized in that the separation nozzle is made in the form of a fine mesh. 3. The contact separation element according to claim 1, characterized in that it comprises a gas recirculation tube located between the liquid supply tube and the annular gap. 4. The contact separation element according to claim 3, characterized in that a displacer is located above the gas recirculation tube.

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