JPS5918081B2 - Column packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packing in a packed column used for purposes such as gas absorption, distillation, stripping, and humidification.

As is well known, a packed column is a typical gas-liquid contact device, and the so-called packing packed inside the column promotes gas-liquid contact more effectively to perform desired chemical operations such as absorption, distillation, and stripping. The purpose is to carry out the process effectively.

Therefore, the packing increases the gas-liquid contact area, improves the agitation and mixing of the gas-liquid, increases the amount of mass transfer by increasing the contact time, and has a large porosity that reduces the contact resistance to the flow of the gas-liquid. It has a shape that does not cause flooding or channeling (drift flow), and is corrosion resistant to gas and liquid, has low specific gravity, high mechanical strength, and is economically inexpensive. It is a necessary condition.

Furthermore, in terms of shape, in order to make gas-liquid contact effective, the surface area per unit volume must be large, and the effective wetted area must be large, so the distribution of liquid gas is uniform. The one that becomes the best is good.

Therefore, the fillings that are currently commonly used are:
There are many artificially shaped Raschig rings and saddle shapes made of porcelain, steel, plastic, etc., and many other types are known, such as wire mesh made from metal wire and fillings made of small spiral pieces.

However, there is nothing definitive yet.

Furthermore, most of the conventional filling methods are
Generally, a method is used in which the packing material is packed irregularly into the column.

Therefore, the pressure loss of the fluid inside the tower is large, which tends to cause problems such as short paths, channeling (uneven flow), and clogging, and there are cases where the distribution of the fluid passing through the tower becomes unbalanced. In many cases, this is a factor that reduces tower efficiency.

The present invention eliminates such factors that reduce efficiency and has devised and developed a filling material that has many advantages, especially a wide range of applications.

The gist of the invention is that it is based on a wing-shaped bending plate that is twisted in the axial direction, and that a large number of the bending plates are arranged in a regular manner so that the axes of each bending plate are parallel to each other. are connected to form a packing element as an assembly of bent plates, and this element is used as packing arranged in multiple stages in a packed column.

Furthermore, this point will be explained in detail based on this actual case.

FIG. 1 shows a wing-shaped unit folded plate 1 constituting the packing element of the present invention, which is formed by twisting a long and thin plate material in the axial direction.

Note that although this actual example shows a molded product having a twist of 90°, the twist angle is not limited to 90°.

FIG. 2 shows a packing element 2 in which a large number of the unit bent plates 1 are connected so that their axes are parallel to each other.

As for the connection method, through holes 3 are provided at the upper and lower ends of each of the bending plates 1, respectively, and connecting rods 4 are passed through the through holes 3 to skewer each of the bending plates 1. This is a filling element 5.

FIG. 3 shows a structure in which the block-shaped packing elements 5 are arranged in multiple stages in a column to form a so-called packed bed.

As shown in the above-mentioned actual case, the present invention connects a large number of unit folding plates 1 having a certain twist in parallel in such a way that the axes of each folding plate 1 are parallel to each other. Since the constructed elements 5 are stacked and arranged in multiple stages, the following effects can be obtained compared to the case where conventional Raschig rings, saddle-shaped fillings, etc. are used.

First of all, the fluid to be treated when passing through this packed bed is
Regardless of whether it is a countercurrent type or a cocurrent type, the gas-liquid contact effect is extremely high.

That is, the unit bent plates 1 constituting the packing are elongated plates twisted at a certain angle (90° in the case of leprosy), so that when passing through the packed bed, , the fluid to be treated flows as a swirling flow.

Moreover, this swirling flow occurs through the gaps between the unit bent plates 1 arranged regularly over the entire surface of the packed bed, and since the elements 5 are layered in multiple stages, the lower element 5 and the upper element There is a slight phase difference between element 5,
Specifically, if the bending plates 1 located at the lower stage and the bending plates 1 located at the upper stage are arranged in such a relationship that they intersect, the fluid to be treated will be directed to the right side when passing through the packed bed. Turning,
Since the direction of rotation is changed alternately with left rotation and the flow is evenly divided, the contact between gas and liquid is promoted extremely efficiently and uniformly.

Therefore, there are no short paths or channeling phenomena that occur in the case of conventional irregular packings, and a homogeneous processing effect is possible.

Secondly, since the packing of the present invention is a block-shaped packing element 2 that is regularly arranged through the connecting rods 4 through the through holes 3 of the bent plate 1, when it is loaded into a large packed column. ,
Also, when taking it out, it can be easily operated, and when disassembling and replacing the block-shaped element, it takes almost no effort and is convenient to handle and maintain.

Therefore, although it is a regular packing, like the Raschig ring, it can be widely applied to everything from large industrial plants to small experimental equipment.

Third, by making the through holes 3 at the upper and lower ends of each of the bending plates 1 somewhat larger and allowing movement of each of the bending plates 1 and the connecting rods 4, the packed material is transferred into the packed tower 6. It is easier to make adjustments when setting the air conditioner, and since each bending plate 1 is movable, the direction of the gas-liquid flow path and the flow distribution condition change naturally, making the contact between the gas and liquid even more efficient. It will be promoted.

Fourthly, as shown in FIG. 1, the unit folded plate 1 for packing according to the present invention has a simple shape by simply twisting and cutting a long and thin plate, so it can be mass-produced. Even in the production of filling elements that are regularly connected in a block shape, assembly and joining are simple and manufacturing costs are low, so the cost advantage is comparable to that of other filling materials.

Fifth, as another practical example of the packing according to the present invention, a large number of perforations or protrusions etc. are provided on the surface of the twisted blades of the unit bent plate 1, and a packed layer is constructed in the same manner as described above. , the surface of the filler is further wetted with liquid, the effective contact area can be increased, and the liquid is evenly distributed.

Therefore, when it is required to improve the agitation mixing of gas and liquid, lengthen the contact time, and increase mass transfer, high efficiency can be expected by applying this packing.

In this actual case, a large number of bent plates 1 are regularly connected by connecting rods 4 so that the axes of each folded plate 1 are parallel, and the folded plates 1 are packed as an aggregate. This connection method consists of the connecting rod 4.
It should be noted that the method is not limited to this method, but welding, adhesives, etc. may also be used.

[Brief explanation of the drawing]

FIG. 1 shows a wing-shaped unit folded plate constituting the packing element of the present invention. FIG. 2 shows a packing element according to the invention. FIG. 3 is a longitudinal cross-sectional view of a packed tower loaded with packing elements according to the present invention as a packed bed. DESCRIPTION OF SYMBOLS 1... Feather-like unit bent plate, 2... Filling element, 3... Through hole, 4... Connecting rod, 5...・Block-shaped filling element, 6・
... Packed tower.

Claims (1)

[Claims] 1 A block-shaped packing element is formed by regularly connecting a large number of wing-shaped bent plates twisted in the axial direction so that the axes of each folded plate are parallel to each other. A column packing characterized in that the elements are arranged in multiple stages. 2. A large number of vane-like bent plates that are twisted in the axial direction and have a large number of perforations or protrusions on the surface. are regularly connected so that the axes of each bent plate are parallel to each other to form a block-shaped packing element, and the elements are arranged in a multi-stage apparatus. .