JPS6323804B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-liquid contact device, and more particularly, to a structure of a gas-liquid contact device having strong tray strength. In a gas-liquid contact device that stores liquid on a shelf built into the gas-liquid contact device and moves this liquid to a shelf below a liquid descending part provided in a part of the shelf, This poses a problem in that when the gas-liquid contact device becomes larger, the depth of the liquid on the shelf becomes larger. One way to solve this problem is to increase the length of the part of the shelf from which the liquid flows out, thereby reducing the liquid flow rate per unit of outflow length. In order to increase the outflow length, gas-liquid contact devices have recently been developed that allow the liquid to flow out into multiple gutter radially extending from the center of the shelf to the periphery, and then move the liquid to the lower shelf through the descending section. being researched. Although this conventional gas-liquid contact device has the effect of reducing the depth of the liquid distributed on the shelves, it has the problem that the shelves are weak in strength. As shown in FIG. 1, the shelf 2 in the conventional gas-liquid contact device 1 has a structure in which only the peripheral portion of the shelf and the device wall are fixed, and the central portion cannot be fixed. As is well known, the amount of deflection of a secondary plane is proportional to the fourth power of the length between the fixed parts, so in larger gas-liquid contact devices, the length between the fixed parts becomes longer and the strength becomes weaker. As a result, the amount of deflection due to the weight of the liquid increases. When shelf 2 is deflected, the liquid depth changes as shown in Figure 1, and in region B, where the liquid depth is large, the gas rising from below cannot pass through the liquid, and all gas flows through the liquid, where the liquid depth is small. As a result, the liquid passes through area A, resulting in a so-called unfoamed state in area B, and further causes so-called weeping in which the liquid falls directly downward from the holes in the tray 3. When a gas-liquid contact device performs mass transfer between gas and liquid, such as distillation, rectification, absorption, or dissipation, the mass transfer is promoted in the foaming region, so the presence of an unfoamed region or a weeping region will reduce the effect of mass transfer. fatally degraded. In other words, in the case of distillation operations, the efficiency of mass transfer is expressed by the Murfree stage efficiency, but the Murfree stage efficiency of a tray whose entire surface is in a foaming state generally has a high value of 80% or more. , the presence of unfoamed regions results in low Murfree stage efficiency of 10-30%. If the stage efficiency is low, it will not be possible to distill to a predetermined concentration, or a greater number of trays will have to be provided to distill to a predetermined concentration. As mentioned above, the conventional technology has a problem in that the length between the fixed parts of the shelf is long, so the strength is weak and it is easy to bend. The present invention has been made in view of the problems of the prior art described above, and its purpose is to:
An object of the present invention is to provide an excellent gas-liquid contact device in which the strength of the tray is strong and the deflection is small. The present invention is characterized by a gutter in which both side plates constituting the gutter of the shelf extend from the tray surface to contact with the lower tray surface, and a gutter provided at the tip of the gutter with the upper end protruding above the tray surface. , and each shelf has a tray surface with a lower end and a baffle plate extending downward with a gap, and by providing each shelf on the lowest shelf provided on a strong support member, gas and liquid can be The point is that the contact device is configured. Hereinafter, details of the gas-liquid contact device according to the present invention will be explained with reference to the drawings. FIGS. 2 to 5 are diagrams illustrating a basic embodiment of the present invention. The gas-liquid contact device 1 incorporates a large number of shelves 2 . Further, the shelf 2 is composed of a tray 3 with holes (not shown), at least three or more gutter 4 , and a liquid descending section 5. A gutter 4 extends radially from the center of the shelf 2 toward the periphery, and both side plates 41 forming the gutter are connected to the tray 3.
It extends from the surface until it comes into contact with the surface of the lower tray 3, and is formed to have a concave cross section by sealing the bottoms of the side plates 41 with the bottom plate 42. Further, at the tip facing the periphery of each gutter, two baffle plates 43 have their upper ends protruding above the tray 3 surface, and their lower ends extending downward so as to have a gap 6 with the lower tray 3 surface. There is. Furthermore, by connecting one end of the baffle plate 43 to the wall of the gas-liquid contacting device, the horizontal shape of the wall, baffle plate, and gutter is equal to that of a split circle or a gutter with a shape close to this. A number of liquid descending portions 5 are formed. Further, both side plates 41 of each gutter 4 are connected to each other at the center of the shelf 2 . Since the present invention is constructed as described above, it has the following effects. Since the liquid on the tray 3 is blocked from flowing directly to the liquid descending section 5 by the baffle plate 43,
The entire amount of liquid flows into the trough 4 and further flows through the trough 4 towards the periphery and flows out into the liquid descending section 5 . The liquid accumulated in the liquid descending section 5 flows into the lower tray 3 through the gap 6. On the other hand, the gas passes through the holes in the tray 3 and further passes through the liquid distributed on the tray 3, thereby forming bubbles and effectively bringing the gas into contact with the liquid. Each gutter 4 has a structure in which both side plates 41 forming the gutter are connected to each other so that the liquid in the gutter can mutually flow, so that when there is a change in the amount of liquid flowing into each gutter 4 , It has the effect of equalizing this. Further, the lowermost shelf 2 of the gas-liquid contact device is installed and positioned on a strong support member (not shown) that is separate from the shelf. According to the above embodiments of the present invention, the following effects can be achieved. In other words, since both side plates of the gutter of the upper shelf are in contact with the tray surface of the lower shelf, each shelf is placed on both sides of the gutter on the lowest shelf installed on the support member. Since the trays are stacked with plates interposed in between, the contact portions between the trays and the side plates of the gutter essentially serve as the fixing portions of the shelves, and the length between the fixing portions is shortened. Directly, this makes it possible to create a shelf with strong strength and minimize the amount of deflection of the shelf or tray, and indirectly, even when the gas-liquid contact device becomes larger, it is possible to prevent foaming or weeping. This phenomenon can be prevented and the gas-liquid contact device can be operated with high efficiency. FIG. 6 shows a second embodiment of the present invention, in which the gutter 4 is provided with a bottom plate 42 having an H-shaped cross section at the middle height of a side plate 41 extending downward. As a result, the liquid flowing through the gutter 4 is transferred to the liquid descending section 5.
Since the liquid can flow to a lower position when flowing to the lower part, the liquid can move more smoothly in the liquid descending part 5. FIG. 7 shows a third embodiment of the present invention, in which a liquid container 7 for connecting each gutter 4 is provided in the center of the shelf, and this container 7 is connected to the connecting portion with the gutter 4 . A portion from the upper end of the side plate 41 to the bottom plate 42 is cut out to allow liquid to flow between the gutters 4 . This allows individual gutter 4
Even if there is a fluctuation in the flow rate of liquid in gutter 4 ,
Resistance to the flow of liquid between them is reduced, and changes in flow rates between the gutters 4 can be made more uniform. In the above explanation, the horizontal shape of the liquid descending portion 5 has been explained as being a split circle or close to a split circle, but the effects of the present invention will not change in any way even if the shape is other than that shown in FIGS. 8a and 8b. This is not the case and is naturally included in the present invention. As described above, according to the present invention, the strength of the tray is increased, and therefore an excellent gas-liquid contacting device with small deflection can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view illustrating the contact situation of gas and liquid on the shelf of the gas-liquid contact device, and FIGS. 2 to 5 are diagrams illustrating the basic embodiment of the present invention.
The figure is a plan view of the shelves, Figure 3 is a sectional view taken along line A-A in Figure 2 showing the side surface of the liquid descending part, Figure 4 is a perspective view of the liquid descending part, and Figure 5 is a diagram of each gutter. A perspective view of the connecting portion, and FIGS. 6 and 7 are views showing other embodiments, respectively.
The figure is a cross-sectional view of the liquid descending section, FIG. 7 is a perspective view of a connection section of each gutter, and FIG. 8 is a plan view showing a modification of the liquid descending section. 1 ... Gas-liquid contact device, 2 ... Shelf, 3... Tray, 4 ... Gutter, 5... Liquid descending section, 6... Gap, 7
...liquid container, 41...side plate, 42...bottom plate,
43...Baffle board.

Claims (1)

[Scope of Claims] 1. Each of the plurality of shelves installed inside the gas-liquid contact device includes a tray having a large number of holes and at least three trays extending radially from the center toward the periphery.
In a gas-liquid contacting device consisting of at least one gutter, a baffle plate installed at the tip of the gutter, and a device wall, and an equal number of liquid descending parts as the gutter, each shelf constitutes a gutter. a baffle plate whose upper end protrudes above the tray surface and whose lower end extends downward with a gap from the lower tray surface; A gas-liquid contact device characterized by comprising: 2. The gas-liquid contact device according to claim 1, wherein the gutter is constructed by providing a bottom plate with an H-shaped cross section at an intermediate height of the side plates. 3. The gas-liquid contact device according to claim 1, wherein the gutter is constructed by providing a liquid container in the center of the gutter to connect the individual gutter.