JPH0889794A - Packing material - Google Patents

Abstract

PURPOSE: To provide a packing material which improves dispersion property of a liquid on a thin plate made of the packing material, improves the efficiency for gas liquid contact and realizes a good rectifying efficiency, and to improve performance of a packed tower by using a rectifying column for gas-liquid contact equipped with this packing material. CONSTITUTION: The surface of a thin plate 1 is provided with lots of projected parts 2 with specified distance in the horizontal direction which represents the i-th line and with a continuous projected part 3 as the (i+1)-th line in the horizontal direction. These lines are stacked in the axial direction of the tower. The liquid 4 flowing downward is dispersed to a short distance by the projected parts 2 in the i-th line and flows downward to the projected part 3 in the (i+1)-th line. Since the projection 3 is continuous in the horizontal direction, the dispersion distance in the projection 3 is long. By the repetition of the short distance and long distance of dispersion, a good distribution state of the liquid is obtd. on the surface of the thin plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid contactor, and more particularly to a structured packing structure provided in a packed column for distillation, absorption, cooling and the like.

[0002]

2. Description of the Related Art Regarding the structure of a conventional structured packing for gas-liquid contact, Japanese Examined Patent Publication (Kokoku) No. 40-28452 and Japanese Unexamined Patent Publication No. Sho.
No. 4-16761 and JP-A-5-103977. According to these conventional techniques, the filler is made of a wire mesh having a large number of holes, a sheet-shaped metal or the like, and a corrugated one is used as a liquid and gas flow path.
Furthermore, the corrugated flow path is inclined with respect to the tower axis,
Adjacent flow paths are intersected with each other to promote the dispersion and mixing of liquid and gas in the radial direction. As a thin plate material, wire mesh is advantageous in performance because it has accidental wettability that enhances liquid dispersibility, but is inferior to sheet-shaped metal fillers in cost. Therefore, in the sheet-shaped metal packing, minute grooves are provided on the surface to disperse the liquid laterally with respect to the column axis and increase the gas-liquid contact area, or to stagger a large number of convex portions on the thin plate material. A method of arranging them in a line to enhance the dispersion effect of the flow of liquid and gas is used.

[0003]

However, the prior art of the above-mentioned filler is not sufficient for the structure for improving the liquid dispersibility on the surface of the thin plate material. That is, in order to improve the dispersibility of the liquid, only the structure for accelerating the dispersion of the liquid has been studied by staggering the fine grooves or convex portions using the capillary phenomenon.

It is an object of the present invention to further improve the dispersibility of a liquid, enhance the gas-liquid contact efficiency, and provide a packing having a high rectification efficiency.

[0005]

Means for Solving the Problems The above-mentioned object is that in a state where a thin plate material for filling is developed, convex portions and convex portions form rows in the lateral direction at predetermined intervals on the thin plate material, This is achieved by the sections forming rows in the lateral direction, and the rows of the convex sections and the convex sections continuous in the lateral direction are alternately arranged in the axial direction. It is preferably achieved by the lateral extent of the projections in a row being greater than the longitudinal extent, and numerically at least three times greater. More preferably, it is necessary to provide a large number of holes at predetermined intervals on the convex portion continuous in the lateral direction.

[0006]

The thin plate member having a large number of holes has a corrugated flow path inclined with respect to the tower axis, and the thin plate members are arranged so that the flow paths of the adjacent thin plate members cross each other, and the upward flow is increased. Is a filling material in which the gas that is a liquid and the liquid that is a downward flow are in gas-liquid contact, and a large number of convex portions provided at predetermined intervals are provided in the lateral direction on the surface of the thin plate material to form the convex portions in the first row. ing. The second row is provided with laterally continuous convex portions, and the rows of the respective convex portions are alternately provided in the tower axis direction. The liquid that has flowed down from the column axis direction is flown while being dispersed in the first row of the convex portions while being laterally dispersed for a short distance, and the lateral dispersion distance of the liquid is further increased in the second row of continuous convex portions. That is, due to this lateral flow of the liquid, the downward flow velocity of the liquid in the column axis direction decreases at the continuous convex portions in the second row. When the flow velocity of the liquid decreases to some extent,
The liquid holdup increases, and the liquid flows down to the convex portion of the first row of the next row while accelerating. After that, the liquid sufficiently spreads on the thin plate material while repeating this flow pattern. First
The convex portion of the row promotes fine shunting, the convex portion of the second row promotes lateral dispersion of the liquid while utilizing the capillary force of the liquid, and prolongs the gas-liquid contact time. That is, in the conventional packing, since the shape of the convex portion or the shape of the minute groove does not change with respect to the flow direction, the flow velocity of the fluid does not change, the liquid is likely to cause a nonuniform flow, and the efficiency of gas-liquid contact is improved. Had lowered. Therefore, the filling material of the present invention can avoid the drawbacks of the filling material of the conventional example, and can obtain a good liquid distribution on the surface of the thin plate material. As a result, the gas-liquid contact interface increases, and effective gas-liquid contact can be performed.

[0007]

FIG. 1 shows an embodiment of the present invention. FIG. 1 shows a state in which a thin plate material, which is a basic component of the filling material of the present invention, is not folded in a corrugated form, that is, in a deployed state. As the material of the thin plate material 1, for example, metal, plastic, ceramic or the like is used. Here, the thin plate member 1 is made of a thin sheet-shaped metal material. On the surface of the thin plate material 1, for example, a large number of substantially elliptical convex portions 2 and diagonal continuous convex portions 3 shown by diagonal lines are provided by pressing or embossing, and the convex portions 2 are transverse to the flow direction of the fluid 4. The first row of convex portions is formed with a predetermined spacing in the direction. The second row is provided with the projections 3 continuous in the lateral direction, and the rows of the projections are alternately provided in the column axis direction. The liquid 4 flowing down from the column axis direction flows down while being dispersed laterally at a short distance in the convex portion of the first row, and the continuous convex portion 3 of the second row.
Therefore, the lateral dispersion distance of the liquid becomes longer. That is,
Due to this lateral flow of the liquid, the downward flow velocity of the liquid in the column axis direction decreases at the convex portions 3 in the second row. When the flow-down velocity of the liquid decreases to some extent, the hold-up of the liquid increases, and the liquid flows down to the convex portion 2'of the first line of the next line while accelerating. After that, while repeating this flow, the liquid is thin plate material 1
The surface is well dispersed. The convex portions 2 and 2'of the first row promote fine flow division of the liquid, and the convex portions 3 and 3'of the second row promote the lateral dispersion of the liquid while utilizing the capillary force of the liquid, and at the same time vapor-liquid. Increase contact time.

Therefore, with the packing according to the present invention, a good liquid distribution can be obtained on the surface of the thin plate material. as a result,
The gas-liquid contact interface is increased, and effective gas-liquid contact, that is, efficient rectification can be performed. The shape of the convex portion 2 is not limited to the substantially elliptical shape, but may be a rhombic shape, a triangular shape,
A convex portion such as a rectangle may be used. In addition, the thin plate material as the actual filling has many holes in addition to the protrusions,
Omitted because of emphasis on liquid flow description.

FIG. 2 shows an embodiment of the form of the convex portion provided on the thin plate material. The convex portion 2 basically spreads in the lateral direction with respect to the flow-down direction of the fluid 4, and as a structure for efficiently dispersing the liquid in the lateral direction, the lateral spread W of the convex portion 2 is the vertical spread L. The width W in the horizontal direction is more preferably three times or more than the width L in the vertical direction.

In order to increase the gas-liquid contact area, it is advantageous to increase the number of convex portions as much as possible, but the total projected area of the convex portions is at least 20 with respect to the area where the thin plate material is developed. % Or more is necessary to keep the rectification efficiency of the packing good.

FIG. 3 shows another embodiment of the present invention. The basic components are the same as those described with reference to FIG. 1, but the lateral extension of the convex portion 2 is three times the vertical extent, and the convex portion continuous in the second row in the lateral direction is formed. The holes 3 are provided in the portion 3 at predetermined intervals. Explaining the flow of the liquid, the liquid 4 flowing down from the column axis direction flows down while being dispersed in the lateral direction at the convex portions 2 in the first row, and further in the lateral direction of the liquid at the continuous door particles 3 in the second row. The dispersion distance becomes longer. Due to the surface tension, a part of the dispersed liquid splits while flowing down through the holes 3 provided in the convex portion 3. In addition, a part of the remaining part divides the liquid from the front side to the back side of the thin plate material 1 through the holes 3. After that, while repeating this flow, the liquid is thin plate material 1
The surface is well dispersed.

Therefore, according to the present invention, a better liquid distribution can be obtained on the surface of the thin plate material. As a result, the gas-liquid contact interface increases, and effective gas-liquid contact, that is, efficient rectification can be performed. The shape of the convex portion 2 is not limited to the substantially elliptical shape, and the hole does not necessarily have to fit inside the convex portion 3 and does not have to be located directly below the convex portion 2, and some deviation is allowed. I think it will be done.

FIG. 4 shows one embodiment of a thin plate material of the present invention, for example, an aluminum plate 10 which is folded into five pieces. The aluminum plate 10 has a plurality of flow paths 6 bent and tilted with respect to the column axis 11, for example, a corrugated liquid flows down and a gas rises, and holes 5 provided with an appropriate opening ratio. Further, the aluminum plate 10 is provided with the convex portion 2 and the convex portion 3 over the entire surface (not shown in the drawing). Further, the aluminum plates 10 are arranged so that the flow paths alternate with each other, and by stacking a predetermined number of sheets, one filling element is formed.

FIG. 5 shows a cross-sectional view in which the corrugated flow paths 6 of the adjacent aluminum plates 10 are arranged so as to intersect each other in the casing 20 of the packed tower. Further, FIG. 6 is an embodiment showing a state in which three elements, that is, an element 21, an element 22 and an element 23, in which the bent aluminum plates shown in FIG. 4 are assembled, are housed in the casing 20 of the packed tower. Is. Three elements 2
1, 22 and 23 are provided so as to be offset by 90 degrees in order to enhance the effect of dispersing gas and liquid. As described above, when the packing composed of the thin plate material is applied to the rectification column of the air separation device, aluminum is suitable because it is light-weight and easy to work without brittleness in the material. There is strength,
It was confirmed from the manufacturing process of the filling material that a material obtained by work-hardening an aluminum alloy having good forming workability is suitable.

Therefore, by providing the structured packing shown in this embodiment in, for example, a rectification column of an air separation device,
It has an effect that efficient rectification can be performed and can contribute to downsizing of the rectification tower.

[0016]

According to the present invention, since the liquid dispersibility in the packing in the lateral direction can be improved, a structured packing with good rectification efficiency can be realized. Furthermore, by using such packing in the rectification column, the rectification column can be downsized.

[Brief description of drawings]

FIG. 1 is a development view showing an example of a thin plate material of a filling material according to the present invention.

FIG. 2 is a front view showing a geometrical shape of a convex portion.

FIG. 3 is a development view showing another example of the thin plate material of the filling material according to the present invention.

FIG. 4 is a perspective view showing an embodiment of a filling material according to the present invention.

FIG. 5 is a cross-sectional view showing an example of a packed column according to the present invention.

FIG. 6 is a state diagram in which packing is stored in a packed tower.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Thin plate material, 2, 2 '... convex part, 3, 3' ... convex part, 4 ... liquid, 5 ... hole, 6 ... flow path, 21, 22, 23 ...

Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F28F 25/08 A (72) Inventor Nariyasu Okamoto 794 Higashitoyoi, Kudamatsu City, Yamaguchi Prefecture Hitachi Kasa Co., Ltd. Inside the factory

Claims (6)

[Claims] 1. A thin plate material having a large number of holes, said thin plate material having corrugated flow paths inclined with respect to a tower axis, and arranged so that adjacent flow paths of said thin plate materials intersect. Was
In a packing for mass transfer between a gas and a liquid such as distillation and absorption, in a state where the thin plate material is developed, the thin plate material is provided with a predetermined interval and the convex portions and the convex portions are arranged in a row in a lateral direction. And a row of the convex portions and convex portions continuous in the lateral direction are alternately arranged in the column axis direction. 2. The packing according to claim 1, wherein the projections of the rows provided on the thin plate material have a larger lateral spread with respect to the tower axis than the vertical direction. 3. The packing according to claim 2, wherein the projections of the row provided on the thin plate member have a lateral expansion with respect to the tower axis that is at least three times greater than a longitudinal expansion. 4. The packing according to claim 1, wherein a large number of terms are provided at predetermined intervals on the convex portion continuous in the lateral direction. 5. The filling according to any one of claims 1 to 4, wherein the thin plate material is made of a work-hardened aluminum alloy. 6. A rectification column for separating at least one liquid component, wherein the rectification column is provided with at least one raw material gas inflow pipe, a column top withdrawal pipe, and a reflux pipe, and an ascending flow. Claims 1 to 5 in a rectification column in which gas-liquid contact and liquid downward flow are in gas-liquid contact.
A packed column, wherein the packing described in any one of 1 to 3 is provided in the rectification column.