JPH0644987B2 - Catalyst filling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a catalyst packing device, and can be used for the work of packing a catalyst into a reaction tower such as a petroleum refining facility or a chemical industrial facility.

[Conventional technology]

Conventionally, catalysts have been used for various reactions in petroleum refining, chemical industry, etc., and in using them, for example, a granular catalyst is packed in a cylindrical reaction tower or the like. It is common to feed a raw material oil, a reaction liquid, a gas, or a mixture thereof into the reaction tower to catalyze the catalyst surface.

In such a reaction tower, if the catalyst packed inside has a partial density, the feedstock oil, etc. passed through the reaction tower will pass through only the part with a rough density, so that the concentration of that part The catalytic activity of No. 1 rapidly decreases, and even if the other parts are normal, sufficient performance as a reaction tower cannot be obtained, and it becomes necessary to replace the catalyst in a short time. For this reason,
It is necessary to make the density of the packed catalyst as uniform as possible.

In filling these catalysts, it was common for an operator to enter the reaction tower and spray the catalyst using a flexible pipe or the like to evenly distribute the catalyst. However, in such a method, the work efficiency is low, the work is performed in a closed reaction tower, and a large amount of fine powder particles of the catalyst are generated, which is problematic in terms of worker safety and hygiene. For this reason, in recent years, in order to perform safe and efficient catalyst filling work from the outside, granular catalyst is supplied from above to a rotating disk that is suspended and supported in the reaction tower, and is scattered around by a centrifugal force. Many types of catalyst filling devices have been developed.

As one of such catalyst filling devices, a distribution plate having an oval shape or the like is used instead of a disc, and a plurality of distribution paths are formed on the surface in the radial direction, and the distribution channels have different diameters. There is a catalyst filling device formed to have dimensions (see Japanese Patent Application Laid-Open No. 61-141923). In this catalyst filling device, since the catalyst scattered from each distribution path draws a number of circular-centric trajectories, it is possible to spread it uniformly over a wide range by controlling the number of revolutions. The operation is simpler than that of a plate-type catalyst filling device, and uniform catalyst filling can be performed very efficiently.

[Problems to be Solved by the Invention]

By the way, in the catalyst filling device of the above-mentioned JP-A-61-141923, it is necessary to make the spraying density uniform by constantly changing the rotation speed. As becomes smaller, the rotation speed of the distribution plate must be increased so that the catalyst reaches the outer peripheral portion sufficiently.

However, when the disc is rotated at a higher speed than necessary, the centrifugal force acting on the scattered catalyst increases, so that the amount of catalyst falling to the center of the reaction tower decreases. In particular, when the two-stage distribution plate as in the above publication is used, the distribution passage is blocked due to centrifugal force in the lower tubular distribution passage, which makes the spray catalyst more non-uniform and in some cases There is also the possibility that spraying from the steps will be virtually impossible. Also, even if the speed is not so high, the increase in centrifugal force due to the faster rotation at the tip of each distribution path is more pronounced for those with a larger outer diameter. In some cases, the spraying amount was reduced and the catalyst density in the vicinity of the center of the reaction column became coarse, and the work was complicated and laborious to maintain uniform packing.

An object of the present invention is to provide a catalyst filling device capable of performing uniform catalyst spraying over a wide range of conditions and ensuring the catalyst sprayed from near the center even at high speed rotation.

[Means for Solving the Problems]

According to the present invention, at least two distribution plates which rotate coaxially below the catalyst supply pipe and whose upper side has a larger diameter than the lower side are arranged in parallel, and the surfaces of the respective distribution plates are partitioned by a plurality of ribs so as to be radially outside. A catalyst distribution portion that expands in the direction is provided, and the catalyst distribution portions are formed so that the radial lengths thereof are different from each other, and the catalyst distribution portion penetrates through the central portion of the upper distribution plate to reach the vicinity of the lower distribution plate. The catalyst filling device is configured by providing a catalyst dropping portion having a central cylindrical body and a long hole penetrating through the front and back surfaces of the lowermost distribution plate and extending in the radial direction from the central portion.

[Action]

In the present invention thus configured, by distributing the catalyst concentrically by the catalyst distribution portion of each distribution plate,
The density of the catalyst packed in the reaction tower is made uniform. Also,
The distribution plates are arranged in multiple stages, and the catalyst distribution to the outer circumference side is performed by the upper distribution plate, and the catalyst distribution to the inner circumference side is performed by the lower distribution plate. The transition to the outer peripheral side is set within the range of each distribution plate, and the catalyst falling to the inner peripheral side is secured. Further, the central cylindrical body of the catalyst drop portion provided at the center of each distribution plate supplies the catalyst to the distribution plate at the lower stage, and also extends from the long hole provided at the distribution plate at the lowest stage over a predetermined radial length. The catalyst is dropped to ensure that the catalyst falls to the center of the reaction tower even during high-speed rotation, and by these, evenly spraying the catalyst over the entire surface during high-speed rotation is achieved to achieve the above object.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a reaction tower 1 for petroleum refining to which a catalyst filling device 10 of the present invention is applied. The reaction tower 1 has a substantially cylindrical outer shell, and is provided inside with an upper screen 2 and a lower screen 3 through which raw material oil can pass. On the lower screen 3, granular catalysts 4 are loaded and packed. Has been done. In order to fill the catalyst 4, a hopper 5 for storing the catalyst 4 is arranged in the upper opening of the reaction tower 1, and a supply tube 6 for transferring the catalyst 4 is connected to the lower end of the hopper 5 to connect the supply tube 6 with the supply tube 6. The lower end is connected to a catalyst packing device 10 supported at the center of the upper screen 2.

The catalyst filling device 10 is configured according to the present invention, and includes a drive shaft 12 driven by a motor 11 arranged on the upper surface side of the upper screen 2. Two distribution plates 13 and 14 are provided at the lower end of the drive shaft 12, and the catalyst 4 supplied from the supply tube 6 is guided to the center of the distribution plates 13 and 14 through a supply passage 15. Reference numeral 10 is configured so that the catalyst 4 is scattered around by the rotation of the distribution plates 13 and 14 and is scattered on the lower screen 3 to fill the inside of the reaction tower 1.

FIG. 2 shows an essential part of the lower end side of the catalyst filling device 10. In the figure, a fixing member 21 is screwed to the lower end of the drive shaft 12, and a central cylindrical body 23 is supported around the fixing member 21 via four support arms 22.

Here, the inner peripheral edge of the distribution plate 13 is welded and fixed to the peripheral surface near the upper end of the central cylindrical body 23. Further, the upper end of the central cylindrical body 23 is inserted into the lower end side opening of the supply passage 15, and the outer periphery thereof is provided with a conical surface 24 that widens downward from the upper end edge. The lower end of the conical surface 24 is connected to the upper surface of the distribution plate 13 and can be guided to the upper surface of the distribution plate 13 by receiving the catalyst 4 from the supply passage 15.

As shown in FIG. 3, a plurality of ribs 31 are provided on the upper surface of the distribution plate 13 from the outer peripheral edge thereof to the vicinity of the outer circumference of the conical surface 24. The ribs 31 are arranged so as to spread outward in the radial direction and partition the surface of the distribution plate 13 to form a substantially concave catalyst distribution portion 32.

Here, the outer peripheral shape of the distribution plate 13 is formed in a substantially oval shape that is point-symmetric with respect to the rotation axis of the drive shaft 12, and is formed such that the catalyst distribution portions 32 have different radial lengths. ing.
That is, each of the catalyst distribution portions 32 is located in the small diameter portion 33 in the minor axis direction of the distribution plate 13 and the catalyst distribution portions 32C, 32D in the large diameter portion 34 in the major axis direction.
The radius gradually increases toward, and the envelope of the tip is formed so as to draw a substantially involute curve.

The central portion of the distribution plate 13 is connected to the central tubular body 23, and the catalyst 4 from the supply passage 15 can be partially delivered downward through the space inside the central tubular body 23. It is configured as a catalyst dropping portion of the distribution plate 13.

Returning to FIG. 2, the distribution plate 14 is suspended by four bolts 25 attached to the peripheral surface of the central cylindrical body 23 and is parallel to the distribution plate 13 at a predetermined distance from the lower end of the central cylindrical body 23. It is supported coaxially.

As shown in FIG. 4, the distribution plate 14 is formed into a substantially oval shape like the distribution plate 13 described above, and is formed into a substantially concave shape by a plurality of ribs 41 that partition the surface from the outer peripheral edge to the vicinity of the peripheral surface of the central cylindrical body 23. The catalyst distribution part 42 is formed. In each catalyst distribution part 42, the radius gradually increases from the catalyst distribution parts 42A, 42B located in the small diameter part 43 to the catalyst distribution parts 42C, 42D located in the large diameter part 44, respectively, and the envelope of the tip is substantially involute. It is formed to draw a curve. The distribution plates 13 and 14 are distribution plates.
The 14 large diameter portions 44 are arranged so as to overlap the small diameter portions 33 of the distribution plate 13.

Here, in the center of the distribution plate 14, there is a long hole as a catalyst drop portion.
45 are provided. Further, on the upper surface of the distribution plate 14, a pair of auxiliary ribs 46 are provided in the radial direction with the elongated hole 45 interposed therebetween.
The upper edge of the auxiliary rib 46 is inserted into the lower end side opening of the central cylindrical body 23, and the catalyst 4 supplied from above into the central cylindrical body 23 is swept out as the distribution plate 14 rotates, and the long hole 45 is formed. Catalysts other than those dropped from can be delivered to the upper surface of the surrounding distribution plate 14.

A plurality of plate-shaped adjusting members 50 are arranged on the upper surface of the distribution plate 14 along one side edge of the elongated hole 45. These adjusting members 50 are fixed on the base end side by two bolts 47, and the opening area of the long hole 45 is increased by loosening the bolts 47 and advancing the tip end side into the long hole 45 in the width direction. The amount of catalyst dropped from the long hole 45 can be adjusted.

In this embodiment configured as described above, the following operation is performed.

First, the motor 11 of the catalyst filling device 10 is operated to drive the drive shaft 12
The distribution plates 13 and 14 are rotated through the above, and the catalyst 4 is supplied from the hopper 5 to the catalyst filling device 10 through the supply tube 6.

The supplied catalyst 4 drops from the supply passage 15 onto the central cylindrical body 23, and the catalyst 4 on the outer side of the central cylindrical body 23 is sent to the distribution plate 13 by the conical surface 24, and the centrifugal force accompanying the rotation of the distribution plate 13 is generated. Is sprayed on the lower screen 3 from the tip of each catalyst distributor 32. Further, the catalyst 4 in the inner portion of the central cylindrical body 23 is dropped as it is and sent to the distribution plate 14, and is sprinkled on the lower screen 3 from the tip of each catalyst distribution portion 42 by the centrifugal force accompanying the rotation of the distribution plate 14. At the same time, a part is sprayed to the central portion through the long hole 45.

Here, since the catalyst distribution parts 32 and 42 of the distribution plates 13 and 14 have different radial lengths, the catalysts 4 scattered from the tips of the catalyst distribution parts 32 and 42 are substantially distributed on the lower screen 3. It is sprinkled so as to draw a concentric trajectory. That is,
As shown in FIG. 1, the catalyst 4A from the distribution plate 13 is dispersed in a predetermined width range from the outer peripheral edge of the lower screen 3,
Catalyst 4B from 14 is spread over its inner area. Also,
In the central portion of the lower screen 3 which cannot be completely distributed by the distribution plate 14, the catalyst 4C from the long hole 45 is distributed, so that the catalyst 4 is evenly distributed on the lower screen 3 and even in the reaction tube 1. The filling of the catalyst 4 is performed.

According to this embodiment, there are the following effects.

That is, two distribution plates 13 and 14 are provided to share the outer region and the inner region in the reaction tower 1, and the distribution plates 13 and 14 are provided with catalyst distribution portions 32 and 42 having different radial lengths. Since it is provided, the catalyst 4 can be uniformly sprayed over a wide range.

Further, since the catalyst 4 can be dispersed in the central portion through the long hole 45, sufficient catalyst 4 can be secured even in the central portion in the reaction tower 1 which is difficult to be dispersed depending on the distribution plates 13 and 14, and more uniform packing can be achieved. Is possible.

Furthermore, when the distribution plates 13 and 14 are rotated at high speed,
Even if the amount of spray from the small diameter part 33 of the
It can be compensated by increasing the spraying amount in 44 and the distribution plate 14
The decrease in the amount of spraying from the small diameter portion 43 can be compensated by increasing the amount of spraying from the long hole 45, so that the catalyst 4 can be uniformly sprayed without any problem even at high speed rotation, and the high speed rotation reduces the work time. It can be shortened.

On the other hand, the distribution plates 13 and 14 are formed in an oval shape, and each catalyst distribution unit 3
Since the radial lengths of 2 and 42 are increased and decreased between the pair of small diameter portions 33 and 43 and the pair of large diameter portions 34 and 44, the level of the catalyst layer does not change and the catalyst strength is improved. It can be secured and can be used by rotating it in either forward or reverse directions.

Also, the large diameter portion 44 of the distribution plate 14 is the small diameter portion of the distribution plate 13, respectively.
Since it is arranged so as to overlap 33, the envelope of the tip of the catalyst distribution section 32 can be made substantially continuous with the envelope of the tip of the catalyst distribution section 32, and the continuity of the catalysts 4 to be scattered can be increased and more uniformized.

Further, since the change in the radial length of each catalyst distribution portion 32, 42 is based on the involute curve, it is easy to make the circle-centered circular loci drawn by the catalysts 4 scattered from each end substantially constant intervals. A uniform spray can be performed.

Further, the catalyst 4 falling from the common passage 15 can be smoothly supplied to the distribution plate 13 by the conical surface 24, and sufficient catalyst 4 is also supplied to the distribution plate 14 through the central cylindrical body 23 which is the catalyst falling portion of the distribution plate 13. it can.

Further, an auxiliary rib 46 is provided on the upper surface of the distribution plate 14, and the catalyst 4 supplied from above into the central tubular body 23 by the auxiliary rib 46.
The catalyst 4 is swept along with the rotation of the distribution plate 14, so that the catalyst 4 can be smoothly supplied to the distribution plate 14.

In addition, a long hole 45 serving as a catalyst dropping portion is provided at the center of the distribution plate 14.
Since the long hole 45 is formed so as to pass through the center of rotation of the distribution plate 14 and extend over a certain length, the catalyst 4 falling from the vicinity of both ends is deflected outward as the distribution plate 14 rotates and dispersed appropriately. Can be made.

Further, since the adjusting member 50 is provided so that the opening area of the long hole 45 can be adjusted, the amount of the catalyst 4 sprayed to the central portion of the reaction tower 1 can always be optimally adjusted, and more uniform spraying is performed. be able to.

Further, the adjustment of the opening area of the elongated hole 45 by the adjusting member 50 can be easily performed by loosening the bolt 47 and adjusting the amount of advance of each adjusting member 50, and the adjusting member 50 is arranged in the width direction of the elongated hole 45. Since the long hole 45 is advanced, the longitudinal length of the long hole 45 is not changed, and even if the amount of advance is adjusted, the desired spread range can be maintained by the extension of the long hole 45 in the radial direction. Since a plurality of adjusting members 50 can be adjusted separately, fine adjustment can be performed for each part, and an optimum spraying state can be easily realized.

The present invention is not limited to the above embodiment,
The following modifications are also included.

That is, the outer shapes of the distribution plates 13 and 14 are not limited to the oval shape having the intersecting short axis and the long axis, and may be formed into a substantially triangular shape or a substantially rectangular shape having three or more large diameter portions and small diameter portions. .

Further, the distribution plates 13 and 14 are not limited to a shape that is substantially symmetrical with respect to each short axis or long axis, and are formed so that the radial length changes along any rotational direction like a so-called impeller. You may. However, in such a case, the rotation direction is limited to a certain direction, and a large step is generated between the small diameter portion and the large diameter portion adjacent to each other, so that appropriate reinforcement or the like is necessary. It is desirable to form such an oval shape.

Furthermore, the number of the catalyst distribution parts 32 and 42 provided in the distribution plates 13 and 14 may be appropriately changed in the implementation. However, when the number of the catalyst distribution parts 32 and 42 is increased, the width of each becomes narrower and the catalyst 4
Care must be taken not to make it difficult to pass through.

On the other hand, although the two distribution plates 13 and 14 are provided in the above embodiment, the number of distribution plates may be three or more.
Depending on the size of the portion filled with the catalyst therein, etc., it may be appropriately selected for implementation.

Further, the mounting structure of the distribution plates 13 and 14, the structure for guiding the catalyst 4 and the like may be appropriately selected for implementation.

For example, the distribution plate 13 may be directly screwed to the drive shaft 12 and a large number of perforations may be provided around the distribution plate 13 to form a catalyst dropping portion.
Further, the conical surface 24 may be integrally formed by bulging the vicinity of the central portion of the distribution plate. Further, the number of auxiliary ribs 46 may be increased or decreased as appropriate, or may be omitted. Also distribution plate
14 may be suspended by welding a suitable bar material or the like. However, if the central cylinder 23 is supported via the bolts 25 as in the above-described embodiment, the gap between the lower end of the central cylinder 23 and the upper surface of the distribution plate 14 can be adjusted and sent to the catalyst distributor 42. Catalyst 4
Can be adjusted easily.

Furthermore, in the above-mentioned embodiment, the adjusting member 50 that can advance.
Is provided on one side of the long hole 45, but it may be on both sides of the long hole 45. In this case, if the adjusting members 50 on both sides are advanced by the same amount, the symmetry with respect to the center of rotation can be maintained.
A finer adjustment of the distribution of the catalyst 4 to the center of the is possible.

Further, the adjusting member 50 is not limited to a plate shape, and may be any one that can simply adjust the opening area of the elongated hole 45, or is not limited to one in which a plurality is arranged along the side edge of the elongated hole 45, and may be provided on each side. It may be one sheet at a time.

Further, a guide member 60 which also serves as an adjusting member may be provided on the side edge of the long hole 45 as shown in FIG.

In the figure, the guide member 60 has two mounting long holes on the mounting surface 61.
It has 62 and is fixed to the lower surface of the distribution plate 14 by two bolts 48 (see the chain double-dashed line in FIG. 4). This guide member 60 is
It has a guide surface 63 extending downward from one side edge of the mounting surface 61, and a substantially horizontal receiving surface 64 is formed at the lower end edge thereof. The receiving surface 64 is divided into a central portion 64A and both end portions 64B and 64C by two partition plates 65A and 65B. this house,
The end portion 64B is obliquely extended to the side opposite to the guide surface 63, and the side edge thereof is provided with an overflow stop 66A continuous from the guide surface 63. Further, the end portion 64C is directly extended, and a side wall opposite to the guide surface 63 is provided with an overflow stop 66B continuous with the partition plate 65B. Further, the guide surface 63 is provided with a guide port 67, and the central portion 64A is continuous with a projecting portion 68 projecting to the opposite side of the guide surface 63 through the guide port 67.

When such a guide member 60 is used, the catalyst 4 from the long hole 45 drops along the guide surface 63, is once received by the receiving surface 64, and is then evenly distributed in concentric circles as it rotates. . That is, of the catalyst 4 that has dropped onto the receiving surface 64, a portion of the catalyst 4 that has dropped to the central portion 64A directly drops from the side edge opposite to the guide surface 63, and is scattered almost at the center of the reaction tower 1, while the rest remains. It is sent to the projecting portion 68 through the flow guiding port 67, and is scattered on a portion slightly apart from the substantial center of the reaction tower 1. On the other hand, the ends 64B, 64C
The portion that has fallen to is sent to the tip end along the overflow preventives 66A and 66B and scattered, and is concentrically scattered to the outside and further outside of the scattered portion from the above-mentioned protruding portion 68.

Therefore, according to such a guide member 60, the catalyst 4 from the long hole 45 can be dispersed in various forms, and the reaction tower 1
It is possible to further homogenize the catalyst 4 filled in.
Also, the bolt 48 can be loosened to move the guide member 60 back and forth, and the opening area of the elongated hole 45 similar to the adjusting member 50 can be adjusted at the same time.

In addition, the catalyst filling device of the present invention is not limited to the catalyst granules themselves as described above, but can be used for filling solid packings such as Daschig ring and zeolite, adsorption, absorption, extraction,
It can also be applied to the case where the reaction towers are filled with granular materials according to a catalyst frequently used in the chemical industry such as washing.

〔The invention's effect〕

As described above, according to the catalyst filling device of the present invention, it is possible to uniformly distribute the catalyst in the reaction tower, and it is possible to secure the catalyst scattered from the vicinity of the center even at the time of high-speed rotation, so that the uniform catalyst filling can be achieved. Can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing an essential part of the embodiment, FIG. 3 is a top view showing one distribution plate of the embodiment, and FIG. Is a top view showing the other distribution plate of the above embodiment, and FIG. 5 is a perspective view showing the adjusting member of the above embodiment and a guide member that can be used in the above embodiment. 1 ... reaction tower, 4 ... catalyst, 4A, 4B, 4C ... flow of catalyst to be scattered, 5, 6, 15 ... hopper for catalyst supply, supply tube and supply passage, 10 ... catalyst packing device , 11, 12
...... Rotation drive motors and drive shafts, 13,14 …… Distribution plates, 23,45 …… Center tube and slot, which are catalyst dropping parts,
31, 41 ...... Rib, 32, 42 …… Catalyst distribution part, 33, 43 …… Small diameter part, 34, 44 …… Large diameter part, 50 …… Adjusting member, 60 …… Guide member.

Claims (3)

[Claims] 1. At least two distribution plates, which rotate coaxially below the catalyst supply pipe and whose upper side has a larger diameter than the lower side, are arranged in parallel, and the surface of each distribution plate is partitioned by a plurality of ribs in the radial direction. A catalyst distribution part that expands outward is provided, and the catalyst distribution parts are formed so that the radial lengths thereof are different from each other, and the catalyst distribution part penetrates through the central part of the upper distribution plate to reach the vicinity of the lower distribution plate. A catalyst filling unit having a central cylindrical body and a catalyst drop portion having a long hole penetrating through the front and back surfaces of the lowermost distribution plate and extending in the radial direction from the central portion. 2. The distribution plate according to claim 1, wherein each distribution plate is arranged so that a large diameter portion of a lower distribution plate overlaps with a small diameter portion of the upper distribution plate, and the elongated hole is formed in the opening thereof. A catalyst filling device, characterized in that it comprises an adjusting member capable of adjusting the opening area of the elongated hole by advancing in the width direction. 3. The outer peripheral shape of each of the distribution plates and the inner peripheral shape of the elongated hole are formed point-symmetrically with respect to the rotation axis in the first or second aspect of the invention. And a catalyst filling device.