JP7759232B2 - liquid dispensing device - Google Patents

Description

The present invention relates to a liquid dispensing device.

Packed towers, widely used in distillation (rectification) and absorption processes, promote mass transfer between gas and liquid by countercurrent contact, separating or concentrating specific components. Inside the tower, a packed bed filled with packing is located. Within the packed bed, gravity drives the liquid to flow down the surface of the packing in the form of a liquid film or droplets, while the pressure difference between the top and bottom of the tower drives the gas (vapor) up through the packed bed. This gas-liquid contact process separates or concentrates specific components in the gas or liquid phase. To ensure efficient gas-liquid contact, a liquid distributor is installed above the packed bed in the packed tower to ensure the liquid flows uniformly through the bed.

There are many types of liquid dispensing devices and many different methods of dispensing liquid.
Patent Document 1 discloses a pan-type liquid distributor. The pan-type liquid distributor includes a bottom plate with a plurality of spray holes for spraying liquid downward, and a plurality of cylindrical riser pipes with open ends, each of which is erected on the bottom plate with its lower end opening below the bottom plate. The riser pipes are also set to a length that is higher than the liquid level accumulated on the bottom plate.
In a pan-type liquid distributor, liquid is sprayed downward from the spray holes due to the liquid head accumulated in the bottom plate, and gas rising from below is vented above the bottom plate through the riser pipe.

Patent Document 2 discloses a trough-type liquid distributor. The trough-type liquid distributor is located in the center of the space within a distillation column and includes a main liquid passage (main channel) extending in one direction and a plurality of secondary liquid passages (sub-channels) communicating with the main liquid passage and extending in another direction perpendicular to the first direction. The main liquid passage and the secondary liquid passage have open tops, and the main liquid passage has a plurality of holes in its bottom surface for distributing liquid to the secondary liquid passages, and the secondary liquid passage has a plurality of spray holes in its bottom surface for spraying liquid downward.
In a trough-type liquid distribution device, liquid is stored in the main liquid passage and the secondary liquid passage, and the liquid is distributed from the main liquid passage to the secondary liquid passage by the liquid head. The liquid is sprayed downward from the spray holes in the secondary liquid passage, and rising gas is ventilated upward from the gap between the main liquid passage and the secondary liquid passage.

Patent Document 3 discloses a liquid distributor called a pipe type. Similar to the trough type liquid distributor, the pipe type liquid distributor is located in the center of the space within the distillation column and includes a main liquid passage (main channel) extending in one direction and a plurality of secondary liquid passages (sub-channels) communicating with the main liquid passage and extending in another direction perpendicular to the first direction. The main liquid passage and the secondary liquid passage form a closed space, and the main liquid passage has a plurality of holes in its bottom surface for distributing liquid to the secondary liquid passage, and the secondary liquid passage has a plurality of spray holes in its bottom surface for spraying liquid downward.
In a pipe-type liquid distribution device, liquid is stored in a main liquid passage and a secondary liquid passage, and the liquid is distributed from the main liquid passage to the secondary liquid passage by the liquid head. The liquid is sprayed downward from the spray holes in the secondary liquid passage, and rising gas is ventilated upward through the gap between the main liquid passage and the secondary liquid passage.

Japanese Patent Application Laid-Open No. 2000-249464 Japanese Patent Application Publication No. 9-075603 JP 2011-206681 A

However, with pan-type liquid distributors, the area in which liquid accumulates is large due to the presence of a bottom plate, and because it is necessary to accumulate a liquid depth necessary to accommodate operational increases and decreases, there is the issue of a large amount of liquid being accumulated on the bottom plate (liquid holdup). Furthermore, with pan-type liquid distributors, in addition to the small gas passage area, the longer pipe length of the riser pipe increases pressure loss, leading to further increases in liquid holdup due to liquid head.

In a trough-type liquid distributor, the absence of a bottom plate reduces the area where liquid accumulates and increases the area through which gas passes, reducing liquid holdup and pressure loss. However, this has the drawback of making the structure complex. Furthermore, as with pan-type liquid distributors, it is difficult to reduce the height of liquid accumulated above the liquid passage (channel) in a trough-type liquid distributor.

Pipe-type liquid distributors allow for the miniaturization of the device, but because the liquid passages (channels) are closed spaces, the flow rate of the liquid flowing through the liquid passages increases. Pipe-type liquid distributors also have the problem of air bubbles getting into the liquid passages (channels), which can impair the uniform distribution of the liquid.

The present invention was made in consideration of the above-mentioned problems, and aims to provide a liquid distribution device with a simple structure, which is capable of reducing liquid holdup and pressure loss, and has high performance for uniform liquid distribution.

In order to achieve the above object, the present invention employs the following configuration.
[1] A liquid distributor that distributes and allows a liquid descending from above to flow downward and allows a gas ascending from below to pass upward,
a top plate that separates a closed space that stores the liquid from a first space located above the closed space;
a floor panel that separates the closed space from a second space located below the closed space;
a liquid supply pipe located in the first space and having a liquid flow path communicating with the closed space;
a plurality of gas vent pipes that penetrate the closed space and communicate between the first space and the second space;
The liquid distribution device, wherein the floor plate has a plurality of through holes that communicate the closed space with the second space.
[2] The top plate and the floor plate are arranged to face each other vertically,
The liquid distribution device according to [1], wherein the vertical distance between the top plate and the floor plate is shorter than the vertical distance of the liquid flow path.
[3] The liquid distributing device according to [1] or [2], wherein the top plate has a convex shape with an apex at a position where the top plate is connected to the liquid supply pipe.
[4] The liquid distributor according to any one of [1] to [3], wherein the gas vent pipe has a tapered shape in which the diameter gradually decreases from bottom to top when viewed in vertical cross section.
[5] A liquid distributing device according to any one of [1] to [4], wherein, when the floor plate is viewed in a plan view, the ratio of the area occupied by the gas vent pipe to the total area of the floor plate is 20 to 50%.
[6] The liquid distribution device according to any one of [1] to [5], wherein the through holes are provided in the floor plate so as to be 100 to 1500 per square ^meter .

The liquid distribution device of the present invention has a simple structure, is capable of reducing liquid holdup and pressure loss, and has high performance for uniform liquid distribution.

1 is a perspective view schematically illustrating a liquid distributing device according to an embodiment of the present invention. FIG. 10 is a perspective view of a liquid dispensing device according to another embodiment of the present invention. FIG. 10 is a cross-sectional view showing a modified example of a liquid distributing device according to an embodiment of the present invention. FIG. 1 is a cross-sectional view illustrating a verification test of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, showing embodiments thereof.
In addition, the drawings used in the following explanation may show characteristic parts enlarged for convenience in order to make the features easier to understand, and the dimensional ratios of each component may not necessarily be the same as in reality.

<Liquid distribution device>
First, the configuration of a liquid distributing device according to one embodiment of the present invention will be described.
FIG. 1 is a perspective view showing a liquid dispensing apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the liquid distributor 1 of this embodiment is generally configured to include a top plate 2, a floor plate 3, a liquid supply pipe 4, and a riser pipe (gas vent pipe) 5.

The liquid distributor 1 of this embodiment distributes and allows liquid descending from above to flow downward, and allows gas ascending from below to pass upward. Specifically, as shown in FIG. 4(a) described below, the liquid distributor 1 is disposed inside the distillation column 10 in the space between packed beds 20 (20A, 20B) arranged vertically above and below. As a result, the liquid distributor 1 distributes and allows liquid descending from the upper packed bed 20A to flow downward to the lower packed bed 20B, and allows gas ascending from the lower packed bed 20B to pass through and be supplied to the upper packed bed 20A.

The top plate 2 is a plate-like member that separates a closed space V1 that stores a liquid from a first space V2 that is located above the closed space V1.
When viewed from above, the top plate 2 has a liquid supply pipe 4 arranged in the center, and a plurality of openings 2 a arranged around the liquid supply pipe 4 .

The floor plate 3 is a plate-like member that separates a closed space V1 that stores liquid from a second space V3 that is located below the closed space V1.
In the floorboard 3, a plurality of openings 3a and a plurality of through holes 6 are arranged so as not to overlap with each other when viewed from above.

The closed space V1 is located inside a cylindrical container 7 consisting of a top plate 2, a floor plate 3, and side surfaces (not shown), and is a space for storing liquid.

The cylindrical container 7 has an axis extending vertically up and down, with a top plate 2 at the top vertically and a floor plate 3 at the bottom vertically. The top plate 2 and floor plate 3 are arranged so that the underside of the top plate 2 and the upper side of the floor plate 3 face each other. As a result, the top plate 2 separates the closed space V1 from a first space V2 above the cylindrical container 7, and the floor plate 3 separates the closed space V1 from a second space V3 below the cylindrical container 7.

The shape of the cylindrical container 7 (i.e., the shape of the closed space V1) may be cylindrical or rectangular. If the cylindrical container 7 is cylindrical, the top plate 2 and floor plate 3 will have a circular shape when viewed in plan. On the other hand, if the cylindrical container 7 is rectangular, the top plate 2 and floor plate 3 will have a polygonal shape when viewed in plan.

The materials of the top plate 2, the floor plate 3 and the side surfaces (not shown) that constitute the cylindrical container 7 are not particularly limited and can be selected appropriately depending on the type of liquid to be stored in the closed space V1.
For example, when the liquid stored in the closed space V1 is liquefied air, liquefied nitrogen, liquefied oxygen, or the like, the cylindrical container 7 can be made of stainless steel, aluminum, or the like.

The liquid supply pipe 4 is a pipe for supplying liquid descending from above the liquid distribution device 1 to the closed space V1 inside the cylindrical container 7. The inside of the liquid supply pipe 4 forms a liquid flow path 4A through which the liquid flows.

The liquid supply pipe 4 is located in the first space V2 above the cylindrical container 7, and the lower end (tip) of the liquid supply pipe 4 is connected to the center of the top plate 2. This connects the closed space V1 inside the cylindrical container 7 with the liquid flow path 4A inside the liquid supply pipe 4, allowing liquid descending from above the liquid distribution device 1 to be supplied to the closed space V1 inside the cylindrical container 7 via the liquid supply pipe 4.

The riser pipe (rising pipe) 5 is a component with a flow path that allows gas rising from below the liquid distributor 1 to pass above the liquid distributor 1. In other words, the riser pipe 5 is a component that allows gas rising from the second space V3 below the cylindrical container 7 to bypass the closed space V1 via the inner flow path and pass to the first space V2 above the cylindrical container 7.

The riser pipe 5 is a cylindrical (hollow) member with open ends. The riser pipe 5 is positioned so that its axis extends vertically up and down, penetrating the cylindrical container 7 (i.e., the closed space V1). Both ends of the riser pipe 5 penetrate the top plate 2 and floor plate 3 of the cylindrical container 7, respectively, with the upper end opening 5a of the riser pipe 5 facing the first space V2 and the lower end opening 5b facing the second space V3. The upper end opening 5a of the riser pipe 5 is joined liquid-tight to the opening 2a of the top plate 2, and the lower end opening 5b is joined liquid-tight to the opening 3a of the floor plate 3. This allows gas rising from the second space V3 below the cylindrical container 7 to pass through the cylindrical container 7 via the space inside the riser pipe 5 and reach the first space V2.

There is no particular limitation on the material of the riser pipe 5. The material of the riser pipe 5 may be the same as that of the cylindrical vessel 7.
The shape of the riser pipe 5 may be cylindrical or rectangular.

In this embodiment, the upper end opening 5a of the riser pipe 5 and the opening 2a of the top plate 2 are flush with each other, and the lower end opening 5b and the opening 3a of the floor plate 3 are flush with each other, but this is not limited to this.
The upper end opening 5a of the riser pipe 5 may be located above the upper surface of the top plate 2, and the body portion (cylindrical portion) near the upper end of the riser pipe 5 and the opening 2a of the top plate 2 may be joined so as to be liquid-tight.
In addition, the lower end opening 5b of the riser pipe 5 may be located below the underside of the floor plate 3, and the body portion (cylindrical portion) near the lower end of the riser pipe 5 and the opening 3a of the floor plate 3 may be joined so as to be liquid-tight.

The through-holes 6 are spray holes for distributing and allowing the liquid stored in the cylindrical container 7 (i.e., the closed space V1) to flow downward. The through-holes 6 are located in the floor plate 3 and penetrate the top and bottom surfaces of the floor plate 3. The through-holes 6 connect the closed space V1 inside the cylindrical container 7 with the second space V3 below the cylindrical container 7, allowing the liquid stored in the cylindrical container 7 to be distributed and allowed to flow downward.

The area S1 of the top plate 2 and the bottom plate 3 constituting the cylindrical vessel 7 is not particularly limited and can be selected appropriately. For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the area S1 of the top plate 2 and the bottom plate 3 can be set to 0.01 to 30 ^m2 .

Furthermore, the vertical height H1 of the cylindrical container 7 (i.e., the vertical distance between the top plate 2 and the floor plate 3) is not particularly limited and can be selected appropriately. For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the vertical height H1 of the closed space V1 can be set to 30 to 350 mm, and preferably 200 to 300 mm.
By setting the vertical height H1 of the closed space V1 within the above-mentioned preferred range, the vertical height (length) of the riser pipe 5 penetrating the closed space V1 can be shortened, thereby reducing pressure loss compared to conventional pan-type liquid distributors.

The cross-sectional area S2 of the liquid supply pipe 4 perpendicular to the vertical direction is not particularly limited and can be selected appropriately. For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the cross-sectional area S2 of the liquid supply pipe 4 can be set to 0.001 to 18 ^m2 .
Furthermore, the cross-sectional area S2 of the liquid supply pipe 4 is preferably in the range of 10 to 60%, and more preferably in the range of 20 to 50%, of the area S1 of the top plate 2 and the floor plate 3. By setting the cross-sectional area S2 of the liquid supply pipe 4 in the above range, it is possible to reduce the linear velocity of the supplied liquid and also to ensure the necessary area of the gas riser pipe.

The vertical height H2 of the liquid supply pipe 4 (the vertical distance of the fluid flow path 4A) is not particularly limited and can be selected appropriately. For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the height H2 of the liquid supply pipe 4 can be 10 to 200 mm, and preferably 30 to 130 mm.
Furthermore, the height H2 of the liquid supply pipe 4 only needs to be shorter than the vertical height H1 of the cylindrical container 7, and is preferably in the range of 1 to 80%, and more preferably 10 to 65%, of the vertical height H1 of the cylindrical container 7. By setting the height H2 of the liquid supply pipe 4 within the above range, the liquid can be distributed without the liquid depth dropping below the top plate 2 during operation.

The cross-sectional area S3 of the riser pipe 5 perpendicular to the vertical direction is not particularly limited and can be selected appropriately. For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the cross-sectional area S3 of the riser pipe 5 can be set to 0.009 to 12 ^m2 .
Furthermore, the total cross-sectional area S3 of the riser pipes 5 is preferably in the range of 20 to 70%, and more preferably in the range of 35 to 65%, of the area S1 of the top plate 2 and the floor plate 3. By setting the total cross-sectional area S3 of the riser pipes 5 in the above range, the pressure loss occurring in this liquid distributor can be suppressed.

The cross-sectional area S4 of the through hole 6 perpendicular to the vertical direction is not particularly limited and can be selected appropriately. For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the pore diameter S4 of the through hole 6 can be 2 to 10 mm.
The total area of the cross-sectional area S4 of the through holes 6 is preferably in the range of 0.01 to 20%, and more preferably in the range of 0.03 to 12%, of the area S1 of the top plate 2 and the floor plate 3. By setting the total area of the cross-sectional area S4 of the through holes 6 in the above range, the liquid can be well distributed across the cross section of the tower.

The through holes 6 are provided in the floor plate 3 so that there are 100 to 1500 holes/m2 ^. By setting the number of through holes 6 per area provided in the floor plate 3 within the above range depending on the type of packing, it is possible to improve the uniform distribution performance of the liquid.

For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the closed space V1 in the cylindrical vessel 7 of the liquid distributor 1 is always filled with liquid when the distillation column is operating, and the liquid level is present in the liquid flow path 4A in the liquid supply pipe 4. Furthermore, when the operation of the distillation column increases or decreases, the liquid level in the liquid flow path 4A in the liquid supply pipe 4 fluctuates.

The liquid distributor 1 of this embodiment reduces liquid holdup within the liquid distributor 1 (i.e., within the closed space V1), enabling rapid response to increases and decreases in volume during startup and operation of the distillation column.

Furthermore, the liquid distribution device 1 of this embodiment has a simple structure comprising a top plate 2, a floor plate 3 with multiple through-holes 6, a liquid supply pipe 4, and multiple riser pipes (gas vent pipes) 5 (in other words, a simple structure comprising a cylindrical container 7 with multiple through-holes 6 in its bottom surface 3, a liquid supply pipe 4 that supplies liquid to the cylindrical container 7, and multiple riser pipes 5 that vertically penetrate the cylindrical container 7), and therefore can be manufactured inexpensively.

(Application)
The liquid distributor 1 of this embodiment can be applied to a distillation tower 10 shown in FIG. 4( a ), an absorption tower, a cooling tower, and the like.

As described above, the liquid distributing device 1 of this embodiment has a simple structure similar to that of a conventional pan-type distributing device, and therefore can be made smaller and its production costs can be reduced.
Therefore, when the liquid distributor 1 of this embodiment is applied to the distillation column of an air separation unit, the air separation unit can be made smaller (tower vessel, heat insulating material, etc.) due to space saving.
Furthermore, even if the liquid distributor 1 is tilted when installed in the distillation column of the air separation unit, uneven flow of the liquid descending inside the distillation column can be suppressed.

Furthermore, according to the liquid distributor 1 of this embodiment, the capacity of the cylindrical container 7 (closed space V1) can be reduced by shortening the vertical length of the riser pipe 5, thereby reducing liquid holdup.
Therefore, when the liquid distributor 1 of this embodiment is applied to the distillation column of an air separation plant, it can quickly adapt to fluctuations in demand, such as increasing or decreasing the volume of operation.

Furthermore, according to the liquid distributor 1 of this embodiment, the vertical length of the riser pipe 5 can be shortened, thereby reducing pressure loss.
Furthermore, according to the liquid distributor 1 of this embodiment, since a plurality of through holes 6 are provided in the floor plate 3, the performance of uniformly distributing the liquid can be improved.

<Other Embodiments>
First, the configuration of a liquid distributing device according to another embodiment of the present invention will be described.
FIG. 2 is a perspective view of a liquid dispensing apparatus according to another embodiment of the present invention.
As shown in FIG. 2, the liquid distribution device 21 of this embodiment is generally configured to include a top plate 2, a floor plate 3, a liquid supply pipe 4, a riser pipe (gas vent pipe) 5, and an intermediate plate 8 having a plurality of through holes 9.
2, the same components as those of the liquid distributor 1 shown in FIG. 1 are designated by the same reference numerals as those in FIG. 1, and the description thereof will be omitted.

The intermediate plate 8 is a plate-like member that is located in the closed space V1 between the top plate 2 and the floor plate 3 and divides the closed space V1 into an upper space and a lower space.
In the intermediate plate 8, a plurality of openings 8a and a plurality of through holes 9 are arranged so as not to overlap with each other when viewed in a plane.

The riser pipes 5 are inserted into the openings 8 a of the intermediate plate 8 .
The opening 8 a of the intermediate plate 8 is fixed to the body (cylindrical portion) of the riser pipe 5 between the upper end opening 5 a and the lower end opening 5 b.
The method for fixing the riser pipe 5 to the opening 8 a is not particularly limited, and the riser pipe 5 may be fixed by joining the opening 8 a of the intermediate plate 8 to the riser pipe 5 by welding, or the riser pipe 5 may have a vertical cross-sectional shape that is tapered so that it widens slightly vertically downward, and the intermediate plate 8 may be inserted vertically from above the riser pipe 5 to fix it.

The through-holes 9 are dispersion holes that distribute and allow liquid stored in the upper space of the cylindrical container 7 (i.e., the closed space V1) partitioned by the intermediate plate 8 to flow downward into the lower space. The through-holes 9 are located in the intermediate plate 8 and penetrate the upper and lower surfaces of the intermediate plate 8. The through-holes 9 connect the upper and lower spaces of the closed space V1 within the cylindrical container 7, allowing the liquid stored in the cylindrical container 7 to be pre-distributed downward and allowed to flow downward.

The cross-sectional area S5 of the through hole 9 perpendicular to the vertical direction is not particularly limited and can be selected appropriately as long as it is larger than the cross-sectional area S4 of the through hole 6. For example, when the liquid distributor 1 of this embodiment is used in a distillation column, the cross-sectional area S5 of the through hole 9 is preferably in the range of 0.01 to 20% of the area S1 of the top plate 2 and the bottom plate 3, and more preferably in the range of 0.03 to 12%.
Furthermore, it is preferable that the total area of the cross-sectional area S5 of the through holes 9 is equal to the total area of the cross-sectional area S4 of the through holes 6.

As described above, the liquid distributor 21 of the second embodiment, like the liquid distributor 1 described above, has a simple structure that reduces liquid holdup and pressure loss, thereby improving uniform liquid distribution performance.

Furthermore, the liquid distribution device 21 of the second embodiment is configured to divide the closed space V1 into upper and lower vertical sections and is equipped with an intermediate plate 8 having multiple through holes 9. This allows liquid to be pre-distributed from the space above the closed space V1 to the space below, thereby further improving the uniform distribution of liquid.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the liquid distribution devices 1 and 21 of the above-described embodiments, the top plate 2 is described as being flat, but this is not limiting.

FIG. 3 is a cross-sectional view showing a modified example of a liquid distributing device according to an embodiment of the present invention.
As shown in Figure 3, in a liquid distribution device 31 which is a modified example of this embodiment, when viewed in cross section along the axial direction of the cylindrical container 37, the top plate 32 has an upwardly convex shape (convex shape) with its apex at the position where it connects to the liquid supply pipe 4.

With the liquid distribution device 31, the top plate 32 that forms the upper surface of the cylindrical container 37 is inclined toward the liquid supply pipe 4, preventing air bubbles within the cylindrical container 37 (closed space S31) from affecting liquid distribution at the through-hole 6.

In addition, in the liquid distribution devices 1 and 21 of the above-described embodiments, the riser pipe 5 has been described as having the same diameter from bottom to top when viewed in vertical cross section, but this is not limiting. For example, the riser pipe (gas vent pipe) may have a tapered shape in which the diameter gradually decreases from bottom to top when viewed in vertical cross section. This configuration prevents gas from accumulating on the top surface of the cylindrical container, allowing liquid to be smoothly extracted from the liquid supply pipe.

Furthermore, in the liquid distributors 1 and 21 of the above-described embodiments, the cylindrical container 7 is formed by the top plate 2, the bottom plate 3, and side surfaces (not shown) as an example. However, this is not limiting. For example, if the liquid distributor is installed inside a distillation column, the cylindrical container 7 (i.e., the closed space V1) may be formed by joining the top plate 2 and the bottom plate 3 to the inner wall of the distillation column in a liquid-tight manner.

The present invention will be explained in detail below using verification tests, but the present invention is not limited to these.

<Verification test>
4A and 4B are cross-sectional schematic diagrams for explaining a verification test. Fig. 4A shows a case where liquid distribution is performed by disposing the liquid distributor 1 of the above-described embodiment at the top of a distillation column of an air separation unit (Example). Fig. 4B shows a case where liquid distribution is performed by disposing a conventional trough-type liquid distributor at the top of a distillation column of an air separation unit (Comparative Example).

(Example)
In Figure 4(a), packed beds 20 (20A, 20B) are arranged at the top and bottom of the space inside the packed tower 10, and the liquid distributor 1 shown in Figure 1 is arranged in the space between the upper packed bed 20A and the lower packed bed 20B.
In the packed tower 10, first, the liquid flowing down from the bottom of the upper packed bed 20A is collected, mixed, and supplied to the liquid distributor 1. Next, the liquid supplied to the liquid distributor 1 is distributed and supplied above the lower packed bed 20B.

(Comparative Example)
In FIG. 4(b), a conventional trough-type liquid distributor is provided in place of the liquid distributor 1 shown in FIG. 4(a).

(Verification results)
In the comparative example (trough-type liquid distribution device 101), it is necessary to ensure the height of the weir that will accumulate at the maximum treatment liquid flow rate across the cross section of the liquid distributor, so if a specified space is to be secured above the heads of workers, a large space is required between the upper packed bed 20A and the lower packed bed 20B.
In contrast to this, in the embodiment (liquid distributor 1 of the present invention), space can be saved in the vertical direction, so a predetermined space can be secured in a smaller space than in the comparative example.

Furthermore, compared to the comparative example, the embodiment (liquid distribution device 1 of the present invention) has less liquid holdup, which reduces the time required to respond to fluctuations in demand.

DESCRIPTION OF SYMBOLS 1, 21, 31... Liquid distribution device 2, 32... Top plate 2a... Opening 3... Floor plate 3a... Opening 4... Liquid supply pipe 5... Riser pipe (gas vent pipe)
5a: Upper end opening 5b: Lower end opening 6: Through-hole 7, 37: Cylindrical container 8: Intermediate plate 8a: Opening 9: Through-hole 10: Distillation column 20, 20A, 20B: Packed layer H1: Vertical distance between top plate and bottom plate H2: Vertical distance of liquid flow path V1: Closed space V2: First space V3: Second space

Claims (6)

A liquid distribution device that is disposed in a space between packed beds arranged above and below in the vertical direction, distributes liquid descending from the upper packed bed to the lower packed bed and causes gas ascending from the lower packed bed to pass through the upper packed bed ,
a top plate that separates a closed space that stores the liquid from a first space located above the closed space;
a floor panel that separates the closed space from a second space located below the closed space;
a liquid supply pipe located in the first space and having a liquid flow path that supplies the liquid to the closed space;
a plurality of gas vent pipes that penetrate the closed space and allow the gas in the second space to pass to the first space ;
A liquid distribution device, wherein the floor plate has a plurality of through holes that allow the liquid in the closed space to flow down into the second space. The top plate and the floor plate are arranged to face each other vertically,
The liquid distributing device according to claim 1 , wherein the vertical distance between the top plate and the floor plate is shorter than the vertical distance of the liquid flow path. A liquid dispensing device as described in claim 1 or 2, wherein the top plate has a convex shape with its apex located at the position where it connects to the liquid supply pipe. A liquid dispensing device according to any one of claims 1 to 3, wherein the gas vent pipe has a tapered shape in which the diameter gradually decreases from bottom to top when viewed in vertical cross section. A liquid dispensing device according to any one of claims 1 to 4, wherein, when the floor plate is viewed from above, the ratio of the area occupied by the gas vent pipe to the total area of the floor plate is 20 to 50%. The liquid distributing device according to any one of claims 1 to 5, wherein the through holes are provided in the floor plate so that the number of through holes is 100 to 1500 per square ^meter .