JPH10277301A - Liquid enclosing structure for liquid distributor tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid enclosing structure which is equipped with a liquid distributor tray so that a free motion is enabled even under a temperature difference and prevents a liquid from oozing out of a gap between the liquid distributor tray and a distillation column wall. SOLUTION: This liquid enclosing structure for a liquid distributor tray is equipped with an annular shroud 24 and an annular splash plate 28. The shroud is connected to the plate-like member 14 of the liquid distributor tray 12, and an annular space 26 is defined between the shroud 24 and a distillation column wall 10. The plate-like member 14 is connected is such a state that it can accept a significant temperature difference between the plate-like member and the column wall 10. The splash plate 28 is connected to the column wall 10 of the distillation column on the periphery and prevents a liquid falling onto the splash plate 28 from flowing to the inside of the shroud 24 from a peripheral edge inside the splash plate 28 to drop into the space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid closing structure for preventing liquid from leaking between a liquid distributor tray and a distillation column wall. The liquid distributor tray is employed in the distillation column so that a falling liquid layer of the mixture separated between the packing beds can be collected and redistributed. In particular, the present invention particularly provides an annular shroud connected to the liquid distributor tray for collecting the liquid, and an annular splash plate connected to the distillation column wall at a periphery thereof, and a liquid inside the annular shroud. A liquid closing structure for guiding.

[0002]

2. Description of the Related Art Liquid distributor trays are provided in a distillation column on and between beds of a plurality of packing members. The bed of packing members is neatly assembled or irregularly assembled. Such a bed of packing members can be used to enhance the mass transfer between the liquid and gas phases of the mixture to be separated. Such a mass transfer element spreads the liquid phase across the surface of the packing, producing a film that falls into the distillation column. The gas phase rises in the packing member and contacts the surface of the liquid thin film. This action of the packing member enhances the mass transfer between the vapor and the liquid. The liquid distributor tray ensures that the liquid phase is evenly distributed across the top of the underlying packing bed.

[0003] In a common type of liquid distributor tray, such a liquid distributor tray is hermetically connected directly to the distillation column by means such as welding. The liquid distributor tray comprises a plurality of risers arranged regularly. Such risers allow vapor to pass through the liquid distributor tray. The riser is provided with a cap that prevents liquid from falling directly into the riser. A plurality of rows of orifices or drip tubes are provided between the risers. This allows the liquid to be evenly distributed in the underlying mass transfer element.

[0004]

In the liquid distributor tray as described above, due to the temperature fluctuation between the liquid distributor tray and the distillation column wall, an excessive portion is formed at a connection portion between the liquid distributor tray and the distillation column wall. There is a problem that the stress of the above occurs.
Then, the connection between the liquid distributor tray and the distillation column wall may be disconnected due to the stress. For example, in a cryogenic apparatus, the liquid distributor tray should not be welded directly to the distillation column wall to maintain freedom of movement under the thermal expansion and contraction kinetic forces. In this way, the liquid distributor tray can be held in place only by leaky clips or annular clamping rings. However, this structure has created particular problems when such trays are used as intended. The purpose of such trays is to make the distribution of liquid more uniform, and the uniformity of such liquid distribution may be reduced by leakage.

As described above, according to the present invention, the liquid distributor tray can be mounted so that it can move freely even under a temperature difference, and the liquid is supplied from between the liquid distributor tray and the wall of the distillation column. A liquid closure structure is provided that operates to prevent seepage.

[0006]

SUMMARY OF THE INVENTION A liquid closure structure for a liquid distributor tray is provided to prevent leakage of liquid through a peripheral connection between the liquid distributor tray and the distillation column wall. . The liquid closure structure includes an annular shroud connected to the liquid distributor tray. The annular shroud is dimensioned such that an annular space is defined between the annular shroud and a distillation column wall. Means are provided for guiding the descending liquid inside the annular shroud. By the action of this means liquid is prevented from flowing into said annular space. In this way it is possible to prevent the formation of a liquid head on the peripheral connection between the liquid distributor tray and the distillation column wall.

Although a separate liquid collecting device with a central downcomer can be used, the liquid guiding means can be formed by an annular splash plate. This allows the liquid to be guided into the annular shroud and therefore away from the annular space containing the mounting for the liquid distributor tray. The use of the annular splash plate on the liquid distributor tray depends on the special requirements for the entry of liquid onto the liquid distributor tray. In any embodiment, liquid is prevented from escaping from between the liquid distributor tray and the distillation column wall since liquid can never enter the annular space. As such, the liquid distributor tray can be mounted in a manner that allows the liquid distributor tray to perform thermal motion without causing leakage.

While the claims herein clearly point out the subject matter that applicants consider as the invention, the invention will be better understood with reference to the following drawings.

[0009]

Referring to the drawings, a distillation column 1 comprises:
It is shown with a tower wall 10 and a liquid distributor tray 12. The liquid distributor tray 12 is of a type known as an orifice tray or a tray for a vapor riser. In the liquid distributor tray 12,
A plate-like member 14, a steam riser pipe 16, and a drip pipe 18 are provided. The rising steam is rising through the steam riser 16. Liquid is raining down from the drip tube 18 onto the underlying mass transfer element, for example, onto a neatly or irregularly assembled packing.

The liquid distributor tray 12 is supported at its periphery by plate-like members 14 by ring-shaped clamps 20 and 22. The plate-shaped member 14 is clamped at its periphery in ring-shaped clamps 20 and 22. With this type of connection, the difference in thermal expansion and the difference in thermal contraction between the plate-shaped member 14 and the tower wall 10 are allowed.

As can be understood, the ring-shaped clamp 2
0 and 22 can be relatively expanded or slidably engaged with the plate-like member 14, so that when the liquid head is strengthened on the plate-like member 14, , May be a source of leakage. In order to prevent this, an annular shroud 24 is provided. The annular shroud 24 is connected to the plate-like member 14.
It is connected to the. Thereby, liquid is collected in the annular shroud 24. Due to the presence of the annular shroud 24, an annular space 26 is formed between the tower wall 10 and the annular shroud 24.

An annular splash plate 28 is provided to prevent the head of liquid from building up on the ring-shaped clamps 20 and 22. The annular splash plate 28 is hermetically connected to the column wall 10 of the distillation column 1. The annular splash plate 28 is dimensioned as follows. That is, the annular space 26 is covered, and the liquid that otherwise would fall into the annular space 26 is dropped onto the annular splash plate 28 and then from the inner peripheral edge 30 of the annular splash plate 28. The annular splash plate 28 is sized so that it flows into the annular shroud 24, thereby containing and redistributing the liquid. Therefore, the head of the liquid is held by the ring-shaped clamps 20 and 22.
It is prevented from building on. To further assure that the descending liquid falls inside the annular shroud 24, a cylindrical member 32 may be provided. As shown, the cylindrical member 32 securely extends from the inner peripheral edge 30 into the annular shroud 24. In this case, it is preferable to provide a slight gap between the cylindrical member 32 and the annular shroud 24. The cylindrical member 32 must be attached to the inner peripheral edge 30 with a liquid tight seal.

As will be appreciated, the present invention is not limited to the illustrated liquid distributor tray 12, but may be applied to other similar devices. In this regard, in this regard, in another embodiment of the present invention, the annular shroud 24 may be connected to the inner peripheral edge 30 of the annular splash plate 28. In that case, the annular splash plate 28 may be provided with similar support means to allow a temperature difference between the ring-shaped clamps 20 and 22 or between the annular splash plate 28 and the tower shell. Between, can be supported. As can be appreciated, the annular shroud 24 needs to be formed from a thicker material to support the liquid distributor tray 12.

Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that many changes, additions, and omissions may be made without departing from the spirit and scope of the invention. it can.

[Brief description of the drawings]

FIG. 1 is a partial fragmentary view of a distillation column employing a liquid closure structure of the present invention used in connection with a liquid distributor tray.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Distillation column 10 Column wall 12 Liquid distributor tray 14 Plate member 16 Steam riser tube 18 Drip tube 20 Ring clamp 22 Ring clamp 24 Annular shroud 26 Annular space 28 Annular splash plate 30 Inner peripheral edge 32 cylindrical member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Christopher John Hein GU, UK 4.7 Sally, Guildford, Barfham, Wailey Farm, Manston Road 18 (72) Inventor Robert Michael・ Trogud GU 5.9, UK, Surrey, Shear, Upper Street (no address), West Burdens (72) Inventor Ramachandran Krishnamurti Chesnut Ridge, 10977-6909, New York, USA , Ross Avenue 13

Claims (3)

[Claims] 1. A liquid closure structure for a liquid distributor tray that prevents liquid from leaking through a peripheral connection between the liquid distributor tray and a wall of a distillation column, wherein the liquid closure structure comprises: An annular shroud connected to a liquid distributor tray, the annular shroud being dimensioned such that an annular space is defined between the annular shroud and a wall of the distillation column. The liquid closure structure also includes guide means inside the annular shroud for guiding the descending liquid, whereby the liquid flows into the annular space. Is prevented, and thus,
A liquid closure structure for a liquid distributor tray, wherein a liquid head is prevented from being formed on a peripheral connection between the liquid distributor tray and a wall of the distillation column. 2. The liquid closing structure for a liquid distributor tray according to claim 1, wherein the guide means includes an annular splash plate, wherein the annular splash plate is provided on the distillation column. Peripherally connected to a wall and provided on the annular space, so that liquid falling on the annular splash plate is moved from the inner peripheral edge of the annular splash plate to the inside of the annular shroud. A liquid closure structure for a liquid distributor tray, characterized by flowing to a liquid distributor tray. 3. The liquid closure structure for a liquid distributor tray according to claim 2, wherein said guide means also comprises a cylindrical member, said cylindrical member being connected to said inner peripheral edge. And a liquid closing structure for a liquid distributor tray, wherein the liquid closing structure protrudes downwardly into the annular shroud.