JPS63232820A - Contact packing for fluid - Google Patents

Abstract

PURPOSE:To enhance the gas-liq. contact efficiency of the title packing by combining many ceramic bar-shaped bodies inclined to the axis of a packed tower to obtain an assembly wherein many voids through which a fluid circulates are formed between the respective bar-shaped bodies and using the assembly as the packing. CONSTITUTION:Innumerable fine particles are adhered to the surface of a round bar to form a rugged surface. The obtained round bars 11 and 12 are arranged at a specified inclination to the axis of the packed tower, at prescribed intervals, and almost in parallel. The round bars 11 and 12 are crossed at a symmetrical angle, and the intersections are bonded by an adhesive. Accordingly, since the packing has a three-dimensional reticular internal structure and has many voids, the gas-liq. contact efficiency can be enhanced. In addition, a ceramic material is used for the round bar.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to packed towers for fluid contact, such as ruthless towers, absorption towers, cooling towers, and stripping towers, which are filled with gases, liquids, gas-liquids, gas-liquids, etc. The present invention relates to a fluid contact packing for efficiently contacting a liquid with a catalyst, etc.

[Prior art]

This type of filling is made of ceramics, glass, full bends, beads, bead, rings, plate pieces made of synthetic resin, etc.
They are roughly divided into irregular packings, which are filled irregularly with other shapes, and regular packings, which are regularly filled with repeating structures of various shapes made of the above-mentioned materials.

Among these packings, the former packing has the advantage of being easy to fill into the column, but has the problem of large pressure loss and a tendency to cause fluid channeling. For this reason, the use of the latter type of packing, which requires time and effort to fill into the column but has low pressure loss, has become mainstream.

[Problem that the invention seeks to solve]

By the way, the latter type of packing, that is, regular packing, has a large number of flow passages that are approximately parallel to the axial direction of the column, as is clear from the honeycomb structure that is a typical example thereof, so the pressure loss is lower than that of irregular packing. Although it has the advantage of being smaller compared to
There is a problem that fluid contact efficiency is reduced.

[Means for solving problems]

The present invention relates to the latter type of regular packing, which is a fluid contact packing, in which ceramic rods that are inclined with respect to the axial direction of the packed tower are joined together to allow fluid to flow between each rod. It is characterized by being an aggregate with a large number of voids.

As raw materials for the filler of the present invention, commonly used ceramic raw materials such as porcelain, mullite, alumina, silica, cordierite, and zirconia are used, and rod-shaped bodies are formed by extruding each raw material, for example. The rod-like body is cut to a predetermined length, and each cut rod-like body has a predetermined (
They are crossed at an oblique angle and bonded at each intersection with an adhesive. The filler of the present invention is formed by firing such an aggregate.

In the filling, each rod-like body may be linear or helical. It is preferable that the rod-like bodies that are connected to each other be inclined at symmetrical angles with respect to the axial direction of the packed tower, and that the rod-like bodies that are adjacent to each other in a non-combined state are in a positional relationship that is parallel to each other. . The rod-shaped body is preferably a rod-shaped body having a curved surface such as a cylinder or an elliptical cylinder,
It may also be hollow. Moreover, it is preferable that the surface of each rod-shaped body exhibits a thin uneven shape, and the porosity per volume of the filling is preferably at least 50% □.

[Action/effect of the invention]

The inside of a packing with such a structure has a three-dimensional network structure, and if the fluid flowing in from one end of the packed column and the fluid flowing in from the other end are both gases, the packing has a large number of voids. The contact efficiency between the two is improved by uniformly dispersing them three-dimensionally. In addition, when the descending fluid is a liquid and the rising fluid is a gas, the descending liquid is dispersed in a thin film on the surface of each rod-like body, and at the joining point of each rod-like body, the descending liquid is dispersed in a thin film form. Dispersed in a thin film on the surface,
On the other hand, since the rising gas uniformly disperses a large number of voids in three dimensions, the contact efficiency between the two is improved. Therefore,
Even in the low-temperature liquid volume region, the occurrence of the gas blow-out phenomenon is suppressed, and the fluid contact efficiency does not decrease due to such a phenomenon.

In particular, in the filling, the intersection angle of each rod-shaped body is 50 to 7.
If the porosity is set within the range of 5 degrees and the porosity is set to 50% or more, the fluid contact efficiency can be further improved.
Further, if the surface of each rod-shaped body is formed into a finely uneven shape, the amount of fluid held on the surface increases, and the fluid contact efficiency can be further improved.

[Example I]

(1) Structure of the Filler As shown in the attached drawing, the filler in this embodiment has a large number of P-circles 84 with numerous fine particles adhered to the surface to form fine irregularities on the surface. 1.12, each round bar No. 1 is arranged in a horizontal direction substantially parallel at a predetermined inclination angle and a predetermined interval to form a group, and similarly, each round bar No. 1
are arranged substantially parallel in the horizontal direction at a predetermined angle of inclination and at predetermined intervals to form groups, and these groups are arranged alternately in the vertical direction. Round bars 1 and 12 are oriented in the axial direction of the standing packed tower (
They intersect at symmetrical angles with respect to the vertical direction), and each intersection is connected via an adhesive. Therefore, such a filling has a three-dimensional network-like internal structure and is provided with a large number of voids.

In this example, 81 packings having such a structure were prepared in which the intersection angles of the round bars, the intervals, and the diameters of the surface particles were different. These values for each filling are shown in Table 1. The outer diameter of each filling member is 45° and the height is 73°.

(2) Manufacturing method Ceramic raw materials such as mullite, alumina, silica, cordierite, zirconia, etc. are used as raw materials for the round rod, and the same materials as for the round rod are used as the fine particles. As the organic adhesive in the adhesive, methylcellulose, carboxymethylcellulose, or other limited adhesives are used, and as the embodiment adhesive, one mainly composed of silica-alumina is used. Using these raw materials, -i
Specifically, the following ■ ~ @ processes ■ Round bar extrusion molding, ■ Drying, ■ Cutting to specified length, ■ Next adhesion (round bars together), ■ Drying, ■ Integral adhesion (immersion), ■ Particulate adhesion, ■ The filling is manufactured by appropriately combining drying, (1) glazing, [phase] drying, and (2) firing.

For example, the first method is the process cylinder ■, ■, ■, ■, ■, ■, ■, ■, ■, and the second method is the process cylinder ■, ■, ■, ■, ■, ■, ■, ■. As method 3, a manufacturing method consisting of the steps of ■, ■, ■, ■, ■, ■, ■ is adopted as method 4, and the manufacturing method consisting of the steps of ■, ■, ■, ■, ■, If you want to improve the corrosion resistance and reduce the water absorption of the material, add the [phase] step to each manufacturing method.

In this example, a round bar made of mullite with a length of 250 i+m was extruded in step (2), dried at 105°C for 2 hours in step (2), cut into a length of 8 cs in step (2), and made of silica in step (2). Each round bar is bonded at the intersection using an adhesive consisting of alumina, methyl cellulose, mullite powder, and water, dried at 105°C for 2 hours in step (1), and immersed in a silica-alumina glaze for 10 seconds in step (2). Then, in step (2), mullite particles are sprinkled on the round bar aggregate to make them adhere to the surface of the round bar, and excess particles are removed by vibration; in step (2), mullite particles are dried at 80°C for 1 hour and then at 105°C for 2 hours; In the process, immerse in silica-alumina glaze for 10 seconds, [phase]
After drying at 105°C for 2 hours in step (2), it was fired at 1,240°C for 3 hours.

(3) Ammonia absorption test In an absorption tower with an inner path of 45 cm, the same packing was shifted by 90° in the circumferential direction and stacked 8 (No. 1i1).
A gas-liquid countercurrent contact operation was carried out by injecting air containing about 1,000 ppm of water and flowing water from the upper part of the column as shown in Table 1. The N H, l'& yield rate (%) and pressure loss (fin^q/m) at this time are shown in the example column of the same table.
The comparative example column of Table 1 shows the results of carrying out the above gas-liquid countercurrent contact operation by filling the same absorption tower with a discharged Raschig ring at the same height as the filling height of the 8 above-mentioned packings.

(Left below) Table 1 Referring to Table 1, each of the packings, which are different products, has better absorption efficiency and pressure loss than the comparative product Raschig Ring, and the water flow rate is 4.0%. (m3/♂hr), the packing of Test No. 002, which is the best among the example products, has an absorption efficiency that is 15% higher than that of the Raschig ring and a pressure drop that is 1 lower. . Further, when the water flow rate is 1.0 m/♂hr), the above-mentioned packing improves the absorption efficiency by 27% in terms of its own percentage compared to the Raschig ring.

Generally, the intersection angle of the round bars is preferably 50 to 75 degrees, particularly around 60 degrees. If the crossing angle exceeds 75 degrees, the gas-liquid contact efficiency will decrease, and if the crossing angle is less than 50 degrees, the pressure loss will increase and the liquid will drip at the joint of the round bar, reducing the wetted area. The gas-liquid contact efficiency decreases. The diameter of the tip rod is preferably 2 to IQ x m, particularly 5 to 6 fins. Diameter is 2
If it is less than 1 m, the liquid will drip instead of flowing in an i-film form on the surface of the round bar, resulting in a decrease in the wetted area, and the liquid dispersion in the radial direction of the base will deteriorate, causing a gas-liquid channeling phenomenon. If it exceeds this value, the surface area of the packing will decrease and the performance will deteriorate. The spacing between the tip rods is closely related to the porosity per volume of the filler, and in particular, it is preferable that the porosity is 50% or more in relation to pressure loss, so it is preferably 2 to 10 mm. The diameter of the particles is preferably 0.3 to 2 dragons, particularly around 0.5 dragons. When the particle size is less than 0.3 tsuru, the amount of liquid retained on the surface of the round bar decreases, and when the particle size exceeds 2 tsuru, the amount of liquid retained decreases because the liquid flows around the particles.

[Example 2] The above linear type except for the filling (linear type filling) with an outer diameter of 30 cm and corresponding to Test No. 1 of Example 1, and a round bar extruded into a spiral shape to a height of 50 cm. Using packings (spiral packings) with approximately the same intersection angle, spacing, diameter, and particle size as the packings, 29 pieces of the former and 4 pieces of the latter were separately stacked in a relentless column with an inner diameter of 30 cm, and methanol A heartless test was conducted. In the test, 10 mo of methanol was used in the reboiler.
I1%, water 90 mojl! % of the mixed liquid is made into l'mtwJ, and this mixed liquid is heated with steam and turned into a gas and introduced from the bottom of the tower. At the same time, the gas flowing out from the top of the tower is condensed in a condenser to become a liquid, and this liquid is transferred to the tower. It flowed down from the top. This relentless operation was continued for 6 hours, and then the concentration of methanol in the mixed liquid and the loss of pressure h1 in the glue boiler (A) and condenser (B) were measured. The results are shown in Table 2, and the Raschig ring (1
As a comparative example, we show the results obtained when the specimens were filled to the same height.

Table 2 Referring to Table 2, it can be seen that the linear and spiral packings, which are different products, have equivalent performance, and especially when compared with Raschig rings, the merciless performance is 10 moβ at methanol concentration.
% and reduce pressure loss to 1/4.

[Brief explanation of drawings]

The drawing is a perspective view of a linear packing according to an embodiment of the present invention.

Claims (5)

[Claims] (1) A packing for fluid contact that is packed in a packed tower for fluid contact. 1. A fluid contact packing characterized by being an aggregate having a large number of voids through which fluid flows between bodies. (2) The rod-like bodies that are connected to each other are inclined at symmetrical angles with respect to the axial direction of the packed tower, and the rod-like bodies that are adjacent to each other in a non-combined state are in a parallel positional relationship. A fluid contact filler according to claim 1. (3) The fluid contact filler according to claim 1 or 2, wherein the surface of the rod-shaped body has a finely uneven shape. (4) The fluid contact filler according to claim 1, 2, or 3, wherein the rod-like body has a linear or spiral shape. (5) The fluid contact packing according to claim 1, 2, 3, or 4, wherein the porosity per volume of the aggregate is at least 50%.