JP2003275572A - Method for extracting spent catalyst in reaction column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for extracting a spent catalyst which bores the spent catalyst with a through-hole by using a cord member, such as a chain, extracts the catalyst from this through-hole, is capable of pulling the cord member without cutting the member and of easily boring the catalyst with the through-hole for extraction of the catalyst and facilitates the work to extract the catalyst. <P>SOLUTION: The cord member 25 is disposed in a reaction column 1 and the outer side of the cord member 25 is provided with expansion sections 26 at prescribed intervals. The expansion sections 26 and the cord member 25 are then coupled by coupling members. The cord member 25 is vertically pulled without being cut by the prescribed traction force until the coupling members of all of the expansion sections 26 are cut, by which the cord member 25 is elongated and the through-hole is formed in the catalyst 100. The crushed catalyst 100 is then fed into the hole and is extracted. Since the operation involves the work of extracting the catalyst by gravity fall of the catalyst, the work is made easier. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extracting a used catalyst in a reaction tower for extracting a used catalyst fused and solidified in a reaction tower of a petroleum refining plant, a chemical plant or the like.

[0002]

[Background Art] In oil refining plants and chemical plants,
Various catalysts have been used to accelerate chemical reactions. This catalyst is used by filling the inside of the reaction tower through which the raw material fluid flows. Such a catalyst is
Decrease in activity due to poisoning due to deposition of carbides, metals, etc.
It is necessary to extract from the reaction tower for crushing due to deterioration of mechanical strength and repair or inspection of equipment. This catalyst withdrawal work must be done to shorten the construction period because it is necessary to minimize the plant outage period.

Many of the catalysts in use are in a reducing atmosphere, and if they are opened to the atmosphere for catalyst exchange, carbides, sulfur, etc. attached during use of the catalyst generate heat due to oxidation of the catalyst. Therefore, it is necessary to perform appropriate extraction work while preventing the adverse effects of various adverse conditions on the human body, which may occur, and the effects of catalyst dust on the human body. Further, in a large reaction tower, nitrogen gas may be supplied into the reaction tower in order to prevent ignition due to oxidation of the catalyst, and work may be performed in a nitrogen gas atmosphere.

Conventionally, as a method of extracting the used catalyst in the reaction tower, first, the catalyst outlet of the reaction tower is opened, and it is inspected whether or not the catalyst inside can be taken out, and the catalyst is installed in the lower part of the reaction tower. If the catalyst is solid and the catalyst cannot be removed from the catalyst outlet, use a string-like member (chain) to insert a through hole into the used catalyst. A method is known in which a catalyst is opened and the catalyst is extracted from the through hole. In the method using this chain, a chain that vertically hangs from the nozzle at the upper part of the reaction tower to the nozzle at the lower part and communicates vertically is provided in the reaction tower in advance, and after the catalyst is used, the used catalyst is removed. When putting it out, connect both ends of the chain to a cylinder, for example, and drive the cylinder to alternately pull the chain in one direction to open a through hole for the chain in the catalyst, then remove the chain and remove the used chain. The catalyst is extracted by putting the crushed catalyst into the through hole.

[0005]

By the way, the solidified state of the used catalyst in the reaction tower body is, for example, as hard as the solidified concrete, and is very hard. The chain is initially hung in the reaction tower body, but when the raw material fluid and the catalyst are filled, the chain is immersed in the raw material fluid and the catalyst, and when the catalyst is solidified, the catalyst is It becomes a state of being embedded in etc. If the chain is pulled up or down in this state, the weight of the catalyst portion is applied to the portion that is not embedded in the catalyst or the like, which causes a problem that the chain is cut and the through hole cannot be formed. Therefore, if the chain is made large so that it will not break even if the chain is pulled with a prescribed force, the weight of the chain itself will increase, making it difficult to handle, such as mounting and dismounting. There is a problem that the device becomes large-scale.

An object of the present invention is to draw a catalyst through a through hole using a string-shaped member such as a chain so as to extract the catalyst from the through hole, and to pull the catalyst without cutting the string-shaped member. It is an object of the present invention to provide a method for extracting a used catalyst in a reaction column, which allows a through hole for extracting the catalyst to be easily formed and facilitates the operation for extracting the catalyst.

[0007]

The invention according to claim 1 is a method for extracting a used catalyst from the inside of a reaction tower, wherein a through hole is formed in the used catalyst. A heat-resistant string-shaped member is provided so as to communicate in the vertical direction in the reaction tower before the catalyst is charged into the reaction column, and a predetermined lengthwise direction of the string-shaped member is provided outside the string-shaped member. Expansion portions that are formed at intervals and that can move between the cord-shaped member and the cord-shaped member are provided, and the expansion portions and the cord-shaped member are cut when a predetermined traction force is applied to the cord-shaped member. The expansion part and the string-like member are joined by a joining member that releases the connection, and when the used catalyst is withdrawn, the string-like member is pulled vertically by a predetermined pulling force by the pulling means provided in the reaction tower. , In order from the expanded part near the traction means. The connecting member in the expanded portion is cut to extend the string-shaped member, a through hole is formed in the catalyst by extending the string-shaped member, and then the used catalyst is crushed and the through hole is formed. It is a method of extracting a used catalyst in a reaction tower, which is characterized in that it is charged and withdrawn.

According to the present invention as described above, when the used catalyst is taken out, first, the connecting member connecting the expansion portion and the string-like member is cut by the pulling means, but the string-like member is cut. Without pulling, the through hole is made by extending the expanded portion between the expanded portion and the string-shaped member. As a result of the extension parts formed at predetermined intervals being successively pulled and extended, continuous through holes along the string-shaped member are opened in the catalyst, and if the crushed catalyst is sequentially charged into the through holes, the catalyst will naturally Since it falls, the work of extracting the catalyst becomes easy.

In the present invention as described above, the term "heat resistance" means to withstand the heat generated when the catalyst reacts with the raw material fluid in the reaction tower. Any string-shaped member may be used as long as it has heat resistance, and for example, a chain or a wire rope can be used.
Further, the expansion part may be formed on the outside of the string-like member and can be moved between the expanding part and the string-like member, and can be formed by providing a loop part in the middle of the string-like member, for example. The size of the through hole is not limited, but the operator crushes the solidified used catalyst, and the crushed catalyst can be easily charged and dropped, For example, it is preferable that the holes are formed in a size of about φ120 to φ130.

According to a second aspect of the present invention, in the method for extracting the used catalyst in the reaction column according to the first aspect, the string-like member is formed of a chain in which a large number of chain rings are connected to each other, and the expansion is performed. The part is arranged in a different direction from the other chain ring while keeping at least one of the chain rings connected to each other, and the other chain ring sandwiching the at least one chain ring is the binding member. It is characterized by being formed by combining with. According to the present invention as described above, since it is possible to form the expansion portion only by shifting at least one position of the chain ring that is connected, it is easy to form the expansion portion.

The invention according to claim 3 is the method for extracting the used catalyst in the reaction tower according to claim 1 or 2, wherein the connecting member is a wire. According to the present invention as described above, since the two chain rings can be brought into contact with each other and the wire can be wound around them, the work of joining at the time of forming the expanded portion becomes easy.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the method for extracting a used catalyst in a reaction tower according to the present embodiment uses a catalyst extracting device 20 to use the used catalyst 100 in the reaction tower body 2.
A through hole 100A (see FIGS. 2 and 4) having a predetermined diameter,
The crushed catalyst 100 is put into the through hole 100A and pulled out. Then, the catalyst extraction device 20 is configured to include a chain 25 that is a string-like member, and a pulling means 35 (see FIG. 3) that pulls the chain 25 to open the through hole 100A in the used catalyst 100. .

The reaction tower 1 is for reacting two or more kinds of substances in the reaction tower main body 2 under predetermined temperature and pressure conditions. The first tray 3 provided on the head side and the first tray 3 are provided. The first partition plate 6 is provided below the first partition plate 6 at a predetermined interval, and the second partition plate 7 is provided below the first partition plate 6 at a predetermined interval. Further, immediately below the first partition plate 6 and the second partition plate 7, there are provided second and third trays 4 and 5, respectively.

An upper bed 8 is provided between the first tray 3 and the first partition plate 6 and the second tray 4 and the second tray 4 are connected to each other.
An intermediate bed 9 is formed between the partition plate 7 and the partition plate 7, and a lower bed 10 is formed below the third tray 5.
The reaction tower 1 has a three-layer structure. The upper bed 8, the intermediate bed 9, and the lower bed 10 are each filled with a predetermined catalyst 100. Further, transfer pipes 12 and 13 are provided on the first partition plate 6 and the second partition plate 7 between the upper bed 8 and the intermediate bed 9 and between the intermediate bed 9 and the lower bed 10, respectively. These transfer pipes 12, 1
3 extends to the side of the intermediate bed 9 and the side of the lower tier 10 beyond the second and third trays 4 and 5, respectively. In addition,
The transfer pipes 12 and 13 have an inner diameter of, for example, about 300 mm.

A manhole 15 is provided at the top of the reaction tower main body 2, an upper nozzle 16 is provided beside it, and a catalyst withdrawing nozzle 17 is provided below the reaction tower main body 2. Further, in the operation of extracting the catalyst in the reaction tower body 2, when the catalyst 100 inside is solidified, oil or chemical is injected from the manhole 15 to form an antioxidant film on the catalyst 100, Then, in order to crush the solidified catalyst 100, for example, an air pick 50
When using (see FIG. 4), the pressure guiding hose 50A is inserted from the manhole 15.

In the upper nozzle 16, the chain 25 consisting of a large number of chain rings 27 is suspended at one end through a hook 18 from the back surface of the lid 16A of the upper nozzle 16 and at the other end from the upper nozzle 16 to the first nozzle. The tray 3 of No. 1 and the transfer pipes 12 and 13 are inserted, and the other end is housed in the catalyst extracting nozzle 17. The chain 25 is provided inside the reaction tower main body 2 before being filled with the substance to be reacted and the catalyst 100.

Such a chain 25 has a large number of chain rings 2.
7 are connected to form each chain ring 27, for example, φ22 ×
An 80P size one is used, and the lateral width of the chain ring 27 is 75 mm. Further, the extended portions 26 are formed at predetermined intervals in the longitudinal direction of the chain 25.
6 are provided at a predetermined interval from the vicinity of the first tray 3 of the chain 25 to the vicinity of the catalyst extraction nozzle 17.

As shown in FIG. 2, the expansion portion 26 includes, for example, three chain rings 27A, 27B, 27 among the chain rings 27.
C is displaced from the row with respect to another continuous chain ring 27, and three chain rings 27A, 27B, 27C
Chain ring 27 connected to chain rings 27A and 27C
It is formed by bringing D and 27E close to each other and connecting them 27D and 27E with a wire 30 which is a connecting member. Between the adjacent extended portions 26, for example, three chain rings are arranged between the chain rings 27D and 27E at intervals.

The wire 30 comprises the chain 25 and the reaction tower body 2
When suspended inside, the weight of the chain 25 causes the extension 2 to
6 does not extend, in other words, chain ring 27D,
The wire with which the connection state of 27E is not released, that is, the wire is not cut, is used.
The number 0 wire is of such a size that it can be cut when pulled by a predetermined force by the pulling means 35 described below. In the present embodiment, the wire 30 of the φ4 wire is
Is used and is double wound.

Here, the state of the expanded portion 26 when the wire 30 is cut will be described with reference to FIG. Chain 25
, When a predetermined traction force is applied in the direction indicated by the arrow,
Wire 3 connecting adjacent chain rings 27D and 27E to each other
0 is disconnected. When the chain 25 is continuously pulled, the chain rings 27A and 27 that form the expansion portion 26 are formed.
B, 27C is gradually extended, and three chain rings 27A, 27B, 27 located apart from other continuous chain rings 27 are located.
When C is fully extended, these chain rings 27A, 27
After B and 27C move, a part of the through hole 100A will be formed. Then, when all of the large number of expanded portions 26 are extended, all of the through holes 100A are opened, and the chains 25 are moved by pulling the chains 25 alternately in the vertical direction.
The periphery of is properly cut to form a complete through hole 100A having a predetermined diameter. The width dimension of the chain ring 27 of the chain 25 is 75 mm as described above. By alternately pulling such chain ring 27 in the vertical direction, for example, the through hole 100A of about 125 mm can be formed. Is possible.

The traction means 35, as shown in FIG.
An upper cylinder device 36 is provided on the upper nozzle 16 so as to project upward, and a lower cylinder device 46 is provided on the catalyst withdrawing nozzle 17 so as to project downward. The upper cylinder device 36 includes a cylinder support 37 provided on the flange of the upper nozzle 16, a cylinder mount 38 provided on the cylinder support 37, and a cylinder 39 provided on the cylinder mount 38. . Then, the cylinder 39 and the chain 2
5 is connected to one end via a connecting member 40.

The lower cylinder device 46 includes a cylinder support 47 provided on the flange of the catalyst extraction nozzle 17, a cylinder mount 48 provided on the cylinder support 47, and a cylinder 49 provided on the cylinder mount 48. It is configured to include. And the cylinder 49
And the other end of the chain 25 are connected via a connecting member 50. Therefore, the chain 25 can be pulled upward or downward by interlocking the upper and lower cylinders 39 and 49.

Next, the operation of this embodiment will be described with reference to FIG. First, prior to the catalyst extraction work, after the operation of the reaction tower 1 is stopped, an operator extracts the reaction raw material such as heavy oil from the completely cooled reaction tower main body 2, and then the oil or chemical, or Oil and chemicals are injected to form an antioxidant film on the catalyst 100 in the reaction tower body 2 (passivation treatment). Alternatively, passivation treatment is performed in the process of stopping the operation of the reaction tower 1. After that, in order to crush the solidified catalyst 100, for example, when using the air pick 50, the pressure guiding hose 50A is inserted from the manhole 15.

Next, the lid 16A of the upper nozzle 16 is removed, the chain 25 attached to the lid 16A is pulled out to the outside of the upper nozzle 16, and one end of the chain 25 is connected to the connecting member 4 of the upper cylinder device 36.
The upper cylinder device 36 is installed on the flange of the upper nozzle 16 while being connected to 0. Similarly to the above, the lid 17A of the catalyst extraction nozzle 17 is removed, and the other end of the chain 25 housed in the nozzle 17 is attached to the nozzle 1
7, the lower cylinder device 46 is installed on the flange of the catalyst extraction nozzle 17 with the other end of the chain 25 connected to the connecting member 50 of the lower cylinder device 46.

By interlocking the cylinder devices 36 and 46 and pulling the chain 25 in opposite directions, the expansion portions 26
The wire 30 is cut to move the chain 25. When the wires 30 of all the expansion portions 26 are cut, the chains 25 are alternately pulled in the vertical direction, and the catalyst 10
Through hole 100 of specified diameter by moving the chain 25
Form A.

When all the expansion portions 26 provided at predetermined intervals in the length direction of the chain 25 are extended and the through holes 100A having a predetermined diameter are formed in the catalyst 100, the pulling means 35 is provided.
The chain 25 and the chain 25 are removed from the reaction tower main body 2, and then, as shown in FIG. 4, the operator removes a part of the central portion of the first tray 3 and places the air pick 50 on the catalyst 100 of the upper bed 8. Etc., the catalyst 100 is crushed to a size capable of falling in the through hole 100A, and the crushed catalyst 100 is sequentially charged into the through hole 100A.

All the catalyst 100 in the upper bed 8 is crushed,
And, after putting into the through hole 100A and withdrawing from the catalyst withdrawing nozzle 17, a part of the central portion of the first partition plate 6 and the second tray 4 is removed, and then, as described above, the middle bed The catalyst 100 of No. 9 is crushed, and the crushed catalyst 100 is put into the through hole 100A and extracted.
Subsequently, the catalyst 100 in the lower bed 10 is crushed and extracted, and the catalyst extraction in the reaction tower 1 is completed. In addition,
A predetermined catalyst receiver 60 is installed below the extraction nozzle 17, and is transferred from the catalyst receiver 60 to another transport device (not shown).

According to this embodiment, the following effects can be obtained. (1) When extracting the used catalyst 100, first, the chain 25 is pulled by the pulling means 35, and the expansion portion 26
And disconnect the wire 30 connecting the chain 25 with the chain 25,
The through hole 100A is opened by extending the expansion portion 26 between the expansion portion 26 and the chain 25. As a result of the extension portions 26 formed at predetermined intervals being successively pulled and extended, 10
A continuous through hole 100A along the chain 25 is opened at 0, and if the crushed catalyst 100 is sequentially charged into the through hole 100A, the catalyst naturally drops, so that the catalyst 100 can be easily withdrawn.

(2) Expansion part 26 provided on the chain 25
Is a chain ring 27 among the chain rings 27 connected to each other.
A, 27B and 27C are arranged outside the other chain ring 27 in a connected state, and the chain rings 27A and 27C are also arranged.
Since it can be formed by connecting the other chain rings 27D and 27E to each other with the wire 30, the expansion portion 26 can be easily formed. (3) The two chain rings 27D and 27E are brought into contact with each other, and the wire 30 which is a connecting member is wound around the expanded portion 26.
Can be connected to the chain 25, so that the extension 2
The work of forming 6 is easy.

(4) Between the chain ring 27E connecting the expansion ring 26 to the chain ring 27C of one expansion space 26 and the chain ring 27D connecting to the chain ring 27A of the adjacent expansion space 26. To
The three chain rings 7 are arranged at intervals so that even if the chain 25 is pulled by the cylinder devices 36 and 46, the distance between the expansion portion 26 and a portion of the chain 25 that is not the expansion portion 26 is short. Such a load becomes small, and the possibility that the chain 25 will be cut is very small. Therefore, it becomes easy to open the through hole 100A by the chain 25.

The present invention is not limited to the above-mentioned embodiment, but may be any of the following embodiments as long as the object of the present invention can be achieved. For example, in the above-described embodiment, the expansion portion 26 is replaced by the chain ring 2 of one expansion portion 26.
Chain ring 27E connected to 7C and adjacent extension portion 26
The three chain rings 27 are arranged between the chain ring 27A and the chain ring 27D connected to each other at intervals so that the size of the reaction tower 1 and the size of the chain 25 are not limited to this. It is optional that, for example, four pieces or five pieces are provided between them in accordance with the above. However, if the distance between the expanded portions 26 is made too long, the force of pulling on the chain 25 during that time will greatly act to cut the chain, so that it is preferable to form the chains every five, for example, at the maximum.

Further, in the above embodiment, the chain 25 is used as the string-like member, and the three chain rings 27 are provided outside the other continuous chain ring 27 as the expansion portion 26. Not exclusively. Even if a wire rope having a predetermined diameter is used as the string-like member, a part of the wire rope is formed in the middle of the wire rope, and the root of the part is connected by the wire of the embodiment to form an expanded portion. Good.

Further, in the above embodiment, the connecting member is formed of the wire 30, but the connecting member is not limited to this, and a C ring-shaped connecting member may be used. In this case, the work is easy because the C ring-shaped coupling member is simply hooked between the adjacent chain rings 27D and 27E. Further, instead of the wire 30 as the connecting member, adjacent chain rings 27D and 27E may be connected by welding so as to have a cutting force equivalent to that of the wire 30.

In the above embodiment, the reaction tower 1 has a three-layer structure composed of the upper bed 8, the middle bed 9 and the lower bed 10. However, the present invention is not limited to this.
It is applicable to a single-layer structure and all multi-layer structure reaction towers. Further, in the above-described embodiment, the upper and lower cylinder devices 36 and 46 are used as the pulling means 35, and the chain 25 is pulled by driving these cylinder devices 36 and 46 to open the through hole. Instead, for example, a chain wheel for cycling the chain 25, a speed reducer for driving the chain 25, etc. are provided outside the reaction tower 1, and the chain 25 is cycled between the through hole and the outside of the reaction tower 1. This may be possible, so that the chain 25 may be used as a conveyor chain 25 to carry the crushed catalyst.

Further, as the towing means 35, for example, a crane may be used, and the chain 25 may be directly pulled by the crane. Further, in the above-described embodiment, the through hole 1 is provided at a position deviated from the center along the length direction of the reaction tower 1.
00A was opened, and the catalyst was put into the through hole 100A to withdraw, but in the present invention, the place of the through hole, such as one through which the through hole is opened at the center along the length direction of the reaction tower 1 It can be applied regardless of.

[0036]

As described above, according to the method of extracting the catalyst in the reaction tower of the present invention, when extracting the used catalyst, first, the expansion portion and the string-like member are connected by the pulling means. The connecting member is cut, but the string-shaped member is pulled without being cut, and the expansion part is extended between the expansion part and the string-shaped member to form a through hole. As a result of the extension parts formed at predetermined intervals being successively pulled and extended, continuous through holes along the string-shaped member are opened in the catalyst, and if the crushed catalyst is sequentially charged into the through holes, the catalyst will naturally Since it falls, the work of extracting the catalyst becomes easy.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view showing a reaction tower to which a method for extracting a catalyst in a reaction tower according to the present invention is applied.

FIG. 2 is a diagram showing a main chain of the embodiment.

FIG. 3 is an overall vertical sectional view showing a chain and a traction means of the above embodiment.

FIG. 4 is a vertical cross-sectional view showing a catalyst extracting operation of the embodiment.

[Explanation of symbols]

1 reaction tower 2 Reaction tower body 16 Upper nozzle 17 Catalyst extraction nozzle 20 Catalyst extraction device 25 chains 26 Extension 27 chain ring 27A, 27B, 27C Chain ring forming extension 27D, 27E Chain chains connected by wire 30 Wire that is a connecting member 35 Towing means 36 Upper cylinder device 46 Lower cylinder device 100 catalyst 100A through hole

Claims (3)

[Claims] 1. A method of extracting a used catalyst from the inside of a reaction tower, wherein a heat-resistant string-like member for forming a through hole in the used catalyst is introduced into the reaction tower. Before the catalyst is filled, provided in communication in the vertical direction in the reaction tower, outside the string-like member is formed at a predetermined interval in the lengthwise direction of the string-like member, and between the string-like member And a string-shaped member that is cut when a predetermined traction force is applied to the string-shaped member to release the connection between the expanded part and the string-shaped member. When the used catalyst is extracted, the string-shaped member is vertically pulled by a predetermined pulling force by the pulling means provided in the reaction tower, and the extended portion is located in the vicinity of the pulling means. Cutting the connecting members at all extensions Then, the string-shaped member is extended, and a through-hole is formed in the catalyst by extending the string-shaped member, and thereafter, the used catalyst is crushed and put into the through-hole and extracted. How to remove the used catalyst in the reaction tower. 2. The method for extracting a used catalyst in a reaction tower according to claim 1, wherein the string-like member is formed of a chain in which a large number of chain rings are connected to each other, and the expansion parts are connected to each other. While arranging at least one of the chain rings in a different direction from other chain rings while being connected,
A method for extracting a used catalyst in a reaction tower, characterized in that the other chain ring sandwiching the at least one chain ring is formed by bonding with the bonding member. 3. The method for extracting a used catalyst in a reaction tower according to claim 1 or 2, wherein the connecting member is a wire.