JPH0667441B2 - Gas-liquid dispersion plate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dispersion plate (gas-liquid dispersion plate) for ventilation and liquid passage used in a countercurrent type gas-liquid contact device, and particularly to a liquid. The present invention relates to the structure of liquid passage holes for allowing the liquid to flow uniformly.

[Conventional technology]

It is important to uniformly disperse the gas and the liquid in a gas-liquid contacting device in which the gas and the liquid are brought into countercurrent contact with each other to perform mass transfer or heat transfer operation. Especially when the gas-liquid contactor is a packed column, the dispersibility of the liquid greatly affects its performance. For this reason, gas-liquid dispersion plates having many shapes have been conventionally proposed in order to make the dispersibility of the liquid uniform. For example, there is a structure of a gas-liquid dispersion plate described in Japanese Patent Publication No. 57-1281. However, in the past, its structure was complicated. Further, for a gas-liquid dispersion plate having a simple structure, a gas-liquid dispersion plate is generally used in which a liquid hole is simply formed in the plane of the gas-liquid dispersion plate as a liquid passage hole in addition to the ventilation pipe. However, in this structure, the lower surface of the gas-liquid dispersion plate has an adverse effect on liquid breakage, and there is a drawback that good liquid dispersion is not performed.

[Problems to be Solved by the Invention] In order to allow the liquid to flow down uniformly by the gas-liquid dispersion plate, considering the physical properties of the liquid, etc. An important issue is that the liquid flows down without any interference, and when the liquid that has passed through the liquid passage holes is separated from the lower surface of the dispersion plate, it flows down without moving on the lower surface of the dispersion plate. However, in order to obtain good liquid dispersibility, there is a problem that the structure becomes complicated and the manufacturing cost becomes high as in the above-mentioned conventional technique. On the other hand, if a gas-liquid dispersion plate having a simple structure is used, good liquid dispersibility cannot be obtained, and there is a problem that the performance of the gas-liquid contact device cannot be sufficiently brought out.
An object of the present invention is to provide a gas-liquid dispersion plate having a simple structure and capable of obtaining good liquid dispersibility.

[Means for solving problems]

In order to solve the above problems, when the liquid that has passed through the liquid passage hole is separated from the lower surface of the gas-liquid dispersion plate, the influence of the lower surface of the gas-liquid dispersion plate or the interference with the liquid flowing down from other liquid passage holes It is important to prevent The above object is achieved by providing a groove for draining liquid around each liquid passage hole on the lower surface side of the liquid passage hole of the gas-liquid dispersion plate.

[Action]

The groove provided around the liquid passage hole acts as a drain for the liquid flowing down from the other liquid passage holes. Therefore, the liquid flowing down from the lower surface of the gas-liquid dispersion plate passes through the liquid passage holes, and flows down without being interfered with by the liquid flowing down from the other liquid passage holes. Further, since the lateral movement of the liquid on the lower surface of the dispersion plate is blocked by the groove, good liquid dispersibility can be obtained.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1A and 1B. FIG. 1A shows a sectional view, and FIG. 1B shows a plan view from below. 1 is a ventilation pipe that allows gas from below to flow upward,
Reference numeral 2 is a liquid passage hole through which the liquid flowing down from above is allowed to flow downward, and is uniformly or randomly installed in the gas-liquid dispersion plate 4. 5 is the outer wall of the gas-liquid contact device. A liquid cut groove 3 formed concentrically with the liquid passage hole 2 is provided in the liquid passage hole portion on the lower surface of the gas-liquid dispersion plate 4. The gas-liquid dispersion plate 4 is installed in several places in the vertical direction in the gas-liquid contact device constituted by the outer wall 5. Next, the operation of the present invention will be described. Here, a packed column in which the gas-liquid contact member installed inside the gas-liquid contactor is a packing will be described.

The liquid supplied from the upper part of the packed column comes into countercurrent contact with the gas rising from the lower part and flows through the individual packed beds. Since the liquid flowing down the packing layer is a natural flow, if the packing layer is long, it becomes difficult to flow the liquid uniformly over the cross section of the packing column. Therefore, the gas-liquid dispersion plate is installed before the liquid fills the material layer and its uniformity deteriorates, receives the liquid from above, and distributes it evenly over the entire cross section of the packed column and again. Supply into the lower packed bed. In the gas-liquid dispersion plate, the gas from below flows down through the ventilation pipe 1. The depth of the liquid accumulated on the flat plate of the dispersion plate is
It is approximately proportional to the square of the liquid amount. Further, in order to improve the dispersibility of the liquid, it can be improved to some extent by increasing the pressure of the liquid flowing down from the ventilation hole. The pressure can be increased by increasing the liquid depth on the dispersion plate. However, increasing the liquid depth increases the tower height of the packed column, or the liquid depth is proportional to the square of the liquid amount, which makes operating conditions or increasing / decreasing operation difficult. Therefore, it is desirable to make the liquid depth on the dispersion plate as small as possible. The liquid that has flowed down onto the flat plate on the gas-liquid dispersion plate 4 from above flows into the liquid passage hole 2 while maintaining a constant liquid depth on the dispersion plate. The liquid flowing out from the liquid passage hole forms droplets on the lower surface of the liquid passage hole and adheres to the lower surface side of the dispersion plate. When the liquid is further supplied to the liquid passage hole, the balance between the viscosity or surface tension of the liquid and the weight of the liquid droplet is lost, and the liquid flows downward. Here, when there is no liquid drain groove as in the prior art (that is, in the case of only the liquid passage hole), when the liquid separates from the liquid passage hole and flows down, due to the influence of the lower surface of the dispersion plate, the adjacent liquid passage hole Since it merges with the liquid and flows down, the uniformity deteriorates. This causes a reduction in the efficiency of gas-liquid contact. On the other hand, in the embodiment shown in FIGS. 1A and 1B, due to the action of the liquid drainage groove provided on the lower side of the liquid passage hole, the liquid from the liquid passage hole is easily separated from the gas-liquid dispersion plate. Therefore, the liquid that has passed through the liquid passages flows down independently without being affected by the lower surface of the gas-liquid dispersion plate. Therefore, the liquid in the gas-liquid dispersion plate of the present invention is uniformly dispersed and flows down on the cross section of the packed column. Also, when the gas-liquid dispersion plate is installed with an inclination due to the tilt of the tower or an error in the installation of the gas-liquid dispersion plate, the liquid cutting groove works particularly effectively, and gas liquid The liquid does not move in the tilt direction on the lower surface of the dispersion plate, and good liquid dispersion can be obtained.

Another embodiment of the present invention is shown in FIGS. 2A and 2B. FIG. 2A is a sectional view, and FIG. 2B is a plan view from below. The liquid cutting grooves 3 are formed in a lattice shape, and liquid passage holes are provided inside thereof. Other configurations and operations are the same as those in the first embodiment.

〔The invention's effect〕

According to the present invention, a simple structure of providing a liquid cutting groove around the liquid passage hole of the gas-liquid dispersion plate can satisfactorily drain the liquid from the gas-liquid dispersion plate and obtain uniform dispersion of the liquid. be able to. Also, good liquid dispersion can be obtained without adversely affecting the liquid dispersion with respect to the inclination of the gas-liquid dispersion plate.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of the first embodiment of the present invention, and FIG. 1B is a plan view from below in the first embodiment of the present invention.
FIG. 2A is a sectional view in the second embodiment of the present invention, and FIG. 2B is a plan view from below in the second embodiment of the present invention. 1 ... Vent pipe, 2 ... Liquid passage hole, 3 ... Liquid cut groove, 4 ...
Gas-liquid dispersion plate, 5 ... Outer wall of gas-liquid contact device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Yamazaki Inventor Masahiro Yamato Prefecture, Shimomatsu City, Oita 794, Higashitoyoi, Ltd. Kasado Plant, Hitachi, Ltd. (56) References

Claims (2)

[Claims] 1. An aeration and liquid passage dispersion plate of a gas-liquid contactor for introducing a liquid from an upper part of a tower and a gas from a lower part of the tower to contact a gas-liquid with an internal gas-liquid contact member. The dispersion plate is characterized in that at least one or more liquid passage holes are provided on the lower surface side of the liquid passage holes concentrically with the respective liquid passage holes. 2. The gas-liquid dispersion plate according to claim 1, wherein grooves are provided in a grid pattern on the lower surface side of the dispersion plate, and a liquid passage hole is provided at the center of each grid. Dispersion plate.