JP4287608B2 - Method for extracting spent catalyst in reaction tower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for extracting a spent catalyst in a reaction tower that extracts a used catalyst fused and solidified in a reaction tower or the like of an oil refinery plant or a chemical plant.
[0002]
[Background]
Various catalysts are used in oil refining plants and chemical plants in order to promote chemical reactions. This catalyst is used by filling the inside of a reaction tower through which a raw material fluid flows.
Such a catalyst needs to be extracted from the reaction tower for reduction in activity due to poisoning due to deposition of carbides, metals, etc., crushing due to reduction in mechanical strength, and repair or inspection of equipment. This catalyst extraction work must be carried out so as to shorten the construction period because it is necessary to minimize the plant operation stoppage period.
[0003]
In addition, many of the catalysts in use are in a reducing atmosphere, and if they are opened to the atmosphere for catalyst replacement, carbides, sulfur, etc. attached during use of the catalyst may generate heat due to oxidation of the catalyst. There are various unfavorable conditions that occur on the human body, and proper removal work must be performed while preventing the influence of catalyst dust on the human body.
Further, in a large reaction tower, in order to prevent ignition due to oxidation of the catalyst, nitrogen gas is supplied into the reactor and the operation may be performed in a nitrogen gas atmosphere.
[0004]
Conventionally, as a method of extracting the spent catalyst in the reaction tower, first, the catalyst extraction port of the reaction tower is opened, it is inspected whether or not the internal catalyst can be extracted, and the catalyst extraction provided at the lower part of the reaction tower is extracted. When it can be withdrawn from the mouth, it is withdrawn from it, but when the catalyst is solidified and cannot be withdrawn from the catalyst withdrawal port, a vacuum extraction from the outside of the manhole at the top of the reaction tower is known. Yes.
In this vacuum extraction type, a pick-up driven by a scoop or the like after the reaction raw material such as heavy oil is extracted prior to the vacuum extraction operation, or by air, hydraulic pressure, etc. It is crushed using etc. The catalyst, which has been crushed and made fine, is sucked from the outside of the manhole by, for example, a vacuum suction hose and discharged to a hopper or the like.
[0005]
[Problems to be solved by the invention]
By the way, although the catalyst in the reaction tower is in a solidified state, if it is opened to the atmosphere, carbides and the like attached to the catalyst may oxidize and generate heat, and the temperature in the reaction tower becomes high and the operation becomes difficult. Moreover, since the work may be performed in a nitrogen gas atmosphere, the work in the reaction tower becomes difficult. For this reason, it takes a lot of time to extract the catalyst from the reaction tower, the working efficiency is poor, and as a result, the plant stop time is prolonged.
[0006]
In the conventional catalyst extraction method using vacuum suction, suction is performed with a vacuum suction hose while being crushed, but it must be crushed to a certain degree so that it can be sucked with the suction hose. The hose must always be pulled and moved. Therefore, there are problems that a plurality of workers are required and the working efficiency is poor. In addition, since a special vacuum device is required, an extra cost is required.
In addition, since the catalyst is sucked at a tremendous speed, the catalysts collide with each other during the suction and are often finely crushed into a powder, resulting in a loss of about 20% of the catalyst. There is also a problem that the recovery yield is poor when the catalyst is reused.
[0007]
An object of the present invention is to provide a method for extracting a catalyst in a reaction tower capable of improving working efficiency and reducing costs and improving the yield of catalyst recovery.
[0008]
[Means for Solving the Problems]
  In the present invention, in order to extract a used catalyst from the inside of a reaction tower, the crushed catalyst is extracted using gravity, that is, naturally dropped.
  Specifically, the invention described in claim 1 is a method for extracting a used catalyst in a reaction tower that extracts a used catalyst from the inside of the reaction tower, wherein the used catalyst in the reaction tower includes: A vertical hole drilled from the upper end through the longitudinal center of the reaction tower and a lower end of the vertical hole.TouchA through hole having a slanted hole extending obliquely with respect to the center in the length direction and extending through the medium outletThe first step and opening the through holeAfter that, the catalyst is crushed to a size that can pass through the through hole from the catalyst in the vicinity of the upper end of the through hole.A second step;  CrushingThe catalyst is sequentially put into the through hole and is taken out from the catalyst outlet.A third step, wherein in the first step, the vertical hole is formed by a drilling device that drills the catalyst from an upper end of the catalyst toward an intersection with one end of the oblique hole. The apparatus includes a boring head, driving means for driving the boring head to be rotatable and pressable, and excavated particles of the catalyst that are generated when the vertical hole is drilled by the boring head, inside the pipe member constituting the boring head. The vacuum boring head comprises a pipe member and a drilling member provided at a tip and an outer periphery of the pipe member, and the drilling member includes the pipe member. A plurality of blade portions in which a saw blade-like cut portion is formed in an inclined portion that is radially arranged as a center and has a tapered front side in the drilling direction. If, constructed and a drill part, which is fixed to the tip of the blade members, and there is a possible large-diameter hole machining than the outer diameter of the pipe member when rotated,This is a method for extracting the spent catalyst in the reaction tower.
[0009]
According to the present invention, a through hole is made in the catalyst, the catalyst is sequentially crushed from the catalyst in the vicinity of the upper end of the through hole, and then the crushed catalyst is put into the through hole. Extracted from. As a result, the crushed catalyst can be extracted just by putting it into the through hole, so that the working efficiency can be improved. In addition, the crushed catalyst is sucked from the upper part of the reaction tower by a vacuum device as in the conventional case. Since this is not necessary, a vacuum apparatus is not necessary, and cost can be reduced.
In addition, since the crushed catalyst is put into the through hole, dropped and extracted, it is possible to prevent the catalyst generated due to the intense vacuum suction speed from colliding with each other and further crushed finely. . Therefore, the loss of the catalyst can be reduced, and the yield of recovering the reusable catalyst can be improved.
[0010]
In the above, the size (hole diameter) of the through hole is not limited, but the operator can roughly crush the used catalyst that has been consolidated, and can easily throw in and drop the crushed catalyst. It is preferable that the gap is set to such a size that it can be formed, for example, about 200 to 500 φ. Further, the through hole may be formed by any method, for example, by using a boring device having a drilling blade at the tip or a screw-shaped boring device. Further, when the reaction tower is composed of a multistage layer, the through holes may be formed with the same hole diameter over all stages, for example, or the upper stage may be opened with a large diameter, and the others may be formed with a small diameter.
[0012]
  AlsoAfter drilling the tip hole with the drill part, the drilling part is drilled at the drilling part of the drilling member, and the drilling grains generated when the vertical hole is drilled by the drilling member are vacuum sucked from the inside of the pipe member. The drilling member is not adversely affected by entanglement or the like, and the drilling operation of the vertical hole becomes easy.
[0013]
  Claim2The invention described in claim1In the method for extracting the spent catalyst in the reaction tower according to claim 2, the pipe member of the boring head has a substantially same outer diameter as the pipe member, and a plurality of connectable connecting pipes can be connected. The vertical holes are formed by sequentially adding the connecting pipes to the pipe members of the boring head.
  According to the present invention, since it is possible to make holes while sequentially connecting the connecting pipes according to the height of the reaction tower, it is not necessary to lengthen the connecting pipe itself more than necessary, and as a result, the connecting pipe Is easy to handle.
[0014]
  Claim3The invention described in claim1Or claims2In the method for extracting a spent catalyst in a reaction tower described in 1., the oblique holes are formed before the vertical holes are formed.
  According to the present invention, when the vertical hole is drilled, the drilling portion of the boring head has only to be advanced until it hits the oblique hole, so that the completion of the drilling of the vertical hole can be easily confirmed.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a reaction tower 1 to which the catalyst extraction method of the first embodiment is applied is a reaction column that reacts two or more substances at predetermined temperature and pressure conditions, and is provided on the head side. 1 tray 2, a first partition plate 5 provided at a predetermined interval below the first tray 2, and a second partition plate provided at a predetermined interval below the first partition plate 5 6 is provided. Also, second and third trays 3 and 4 are provided directly below the first partition plate 5 and the second partition plate 6, respectively.
[0019]
The space between the first tray 2 and the first partition plate 5 is an upper bed 7, and the space between the second tray 3 and the second partition plate 6 is an intermediate bed 8. The lower side of the tray 4 is a lower bed 9, whereby the reaction tower 1 has a three-layer structure.
The upper bed 7, the intermediate bed 8, and the lower bed 9 are each filled with a predetermined catalyst 100. Further, between the upper bed 7 and the intermediate bed 8 and between the intermediate bed 8 and the lower bed 9, the first partition plate 5 and the second partition plate 6 are provided with transfer pipes 10 and 11, respectively. These transfer pipes 10 and 11 extend to the intermediate bed 8 side and the lower bed 9 side beyond the second and third trays 3 and 4, respectively. The transfer pipes 10 and 11 have an inner diameter of about 300 mm, for example.
[0020]
A manhole 1 </ b> A is provided in the upper part of the reaction column 1, and a catalyst extraction nozzle 13 that is a catalyst extraction port is provided in the lower part so as to be inclined with respect to the center of the reaction column 1. Further, in the operation of extracting the catalyst from the reaction tower 1, when the internal catalyst is solidified, oil or chemical is injected from the manhole 1A in order to form an anti-oxidation film on the catalyst. In order to crush the bound catalyst, for example, when an air pick is used, a pressure guiding hose is inserted from the manhole 1A.
[0021]
In the catalyst extraction method according to the first embodiment, a through-hole 15 having the same diameter is formed in a used catalyst 100 inside the reaction tower 1, and thereafter, the catalyst 100 is crushed in order from the vicinity of the upper end of the through-hole 15, and the crushed catalyst is penetrated. It is inserted into the hole 15 and extracted from the catalyst extraction nozzle 13.
The through-hole 15 passes through the center of the reaction tower 1 and passes through the vertical hole 16 extending from the upper end of the upper bed 7 to the lower part of the lower bed 9, and the diagonal hole that extends through the vertical hole 16 and the catalyst extraction nozzle 13. It is formed by the hole 17.
[0022]
The catalyst drilling device 20 for drilling the vertical hole 16 of the through hole 15 in the catalyst 100 includes a boring head 21, a driving means 30 that drives the boring head 21 to be rotatable and pressable, and the through hole 15 by the boring head 21. The vacuum drilling means 40 for vacuum-sucking the catalyst excavated particles generated when the vertical holes 16 are drilled from the inside of the pipe member 22 constituting the boring head 21, The book connecting pipes 28 are sequentially connected. The connecting pipe 28 has the same size as the pipe member 22 and is formed to have a length of 1.5 m to 2.0 m, for example.
[0023]
As shown in FIG. 2, the boring head 21 is formed to include the pipe member 22 and an excavation member 23 that is provided at the outer periphery of the pipe member 22 and at the front end in the drilling direction to make a hole in the catalyst 100.
The pipe member 22 is, for example, of 5B (139.8 mm) size and is formed in a predetermined length, and the tip in the drilling direction is formed in a saw blade shape over the entire circumference.
[0024]
The excavation member 23 is formed by forming four plate members 23A to 23D each having an inclined portion at both ends in a cross shape on the outer periphery of the pipe member 22, and the center line of the reaction tower 1 is respectively formed on the front side in the drilling direction. An inclined portion 24 that is inclined toward the surface is formed. The inclined portion 24 is formed with a saw blade-like cut portion in a direction substantially perpendicular to the inclined direction, and a predetermined cutter (not shown) is attached to the cut portion, thereby forming an excavating portion 24A. And the outer diameter of the hole drilled by the excavation part 24A is 220φ, for example. Moreover, the front end side end portion of the inclined portion 24 is flat, and a drill 25 as a drill portion is fixed to the flat portion by welding or the like.
Therefore, when the boring head 21 is rotated while being pressed, the drill 25 makes a fine hole in the catalyst 100, and the drilling portion 24A opens the 220φ vertical hole 16 while expanding the fine hole.
[0025]
Further, on the rear end side of the excavation member 23 (opposite to the drilling direction; upper side in FIG. 2), substantially the same inclination as the inclined portion 24 at the tip of each plate member 23A to 23D is formed extending to the rear end side. When the boring head 21 is pulled out from the vertical hole 15, the inclined portion 26 prevents the rear end side end portions of the plate members 23 </ b> A to 23 </ b> D from interfering with the peripheral wall of the already formed vertical hole 16 and becoming difficult to pull out. It is a guide part to do.
[0026]
The boring head 21 and the connecting pipe 28 are connected by, for example, screw connection. That is, for example, a female screw 22A is cut at one end of the pipe member 22 of the boring head 21, and a male screw 28A is cut at the other end of the connecting pipe 28 to be connected. The male screw 28A and the female screw 22A are screwed together. Thus, the boring head 21 and the connecting pipe 28 are connected.
Further, the connection pipes 28 that are sequentially added are also connected by screw connection in the same manner as the connection between the boring head 21 and the connection pipe 28.
[0027]
Since the vertical hole 16 is opened from the upper end of the catalyst 100 to the lower predetermined position in the vertical direction, the catalyst still remains between the lower end of the vertical hole 16 and the catalyst extraction nozzle 13. Therefore, as described above, the oblique holes 17 can be formed. Although the oblique holes 17 are not shown in the drawing, for example, a screw auger head is used.
The oblique holes 17 are preferably formed before the vertical holes 16 are formed, but may be formed after the vertical holes 16 are formed, or both may be formed in parallel.
[0028]
The boring head 21 as described above is driven by the driving means 30 as described above.
That is, the driving means 30 includes a pressurizing unit main body 32 that is detachably attached to the upper manhole 1 </ b> A of the reaction tower 1 and moves up and down along the guide column 31. The pressurizing unit main body 32 can be moved up and down and pressurized by a pressurizing mechanism driven by a motor 33 and a rotation driving mechanism. Note that the vertical movement of the pressurizing unit main body 32 is performed by, for example, meshing of a rack and a pinion.
[0029]
The pressurizing portion main body 32 is provided with a fixed pipe 34 to which one end of the connecting pipe 28 is connected via a swivel joint or the like (not shown), and the other end of the fixed pipe 34 has a bend shape. A suction hose 41 is connected to the suction hose 41, and the suction hose 41 is connected to a vacuum device, which constitutes the vacuum suction means 40. Therefore, when the connecting pipe 28 is sequentially added to such a fixed pipe 34, the pressurizing portion main body 32 is raised to the upper limit position of the stroke, and the connecting pipe 28 appearing on the upper surface of the manhole 1A. One end of the newly added connecting pipe 28 is screwed and connected to the threaded portion of the other end, and the other end of the newly added connecting pipe 28 is screwed and connected to one end of the fixed pipe 34.
[0030]
On the upper surface of the first tray 2 of the reaction tower 1, a shake prevention means 45 for preventing the shake of the boring head 21 during the drilling operation by the boring head 21 is provided.
The anti-centering means 45 is constituted by, for example, three roller members provided via a support tool that is uniformly arranged in the radial direction with respect to the connection pipe 28, and each roller member is an outer periphery of the connection pipe 28. The connection pipe 28, that is, the boring head 21, can be prevented from being shaken by pressing the connection pipe 28 toward the center while rotating.
[0031]
Next, with reference to FIG. 3, a method for extracting the spent catalyst in the reaction tower 1 will be described.
First, prior to removing the catalyst, the operator, after stopping the operation of the reactor, withdraws a raw material to be reacted such as heavy oil from the reactor 1 that has been completely cooled, and then oil or chemical or oil and oil from the top manhole 1A. Chemical is injected to form an antioxidant film on the catalyst in the reactor 1 (passivation treatment). Alternatively, the passivation treatment is performed in the process of stopping the operation of the reactor 1. Thereafter, in order to crush the consolidated catalyst, for example, when using an air pick, a pressure guiding hose is inserted from the manhole 1A.
[0032]
The drive means 30 is installed on the flange of the manhole 1A, and the pressurizing portion main body 32 of the drive means 30 is positioned at the maximum of the stroke. At that position, the connecting pipe 28 is appropriately connected to the fixed pipe 34 until the drill 25 of the drilling part 24A of the boring head 21 approaches the upper end of the catalyst 100, and the pipe member 22 is connected to the connecting pipe 28. .
Thereafter, the pressurizing part main body 32 is lowered, and a fine hole is made in the upper end part of the catalyst 100 by the drill 25 of the boring head 21. At this time, the pipe member 22 or the connecting pipe 28 of the boring head 21 is inscribed in the three roller members of the anti-shock means 45 to guide the boring head 21.
[0033]
Subsequently, the pressurizing part main body 32 of the driving means 30 is lowered, and the catalyst 100 is gradually perforated while the fine hole made by the drill 25 is expanded by the excavating part 24A.
When the pressurizing unit main body 32 is lowered to the lower limit position of the stroke, the fixed pipe 34 and the connecting pipe 28 of the pressurizing unit main body 32 are disconnected, and then the pressurizing unit main body 32 is raised to the uppermost limit position. One end of the connecting pipe 28 for extension having a predetermined length is screwed into the connecting pipe 28 appearing above the manhole 1A, and the connecting pipe 28 is connected to the fixed pipe 34 of the pressurizing unit main body 32. .
[0034]
Thereafter, in the same manner as described above, the pressurizing unit main body 32 is lowered to the lowest position of the stroke, and a hole is dug in the catalyst 100 by the length of the connected connecting pipe 28. Subsequently, the connecting pipes 28 are sequentially added, and a hole is drilled from the upper bed 7 to a position that leads to one end of the oblique hole 17 of the lower bed 9, and the vertical hole 16 is formed.
On the other hand, in the lower part of the reaction tower 1, the lid of the catalyst extraction nozzle 13 is opened, and an oblique hole 17 reaching almost the center line position of the reaction tower 1 is made with a screw auger type drill.
When the through hole 15 is formed in the catalyst 100 from the upper end to the catalyst extraction nozzle 13 at the lower end, the connecting pipe 28 and the like are sequentially removed in the reverse operation to pull out the boring head 21 out of the manhole 1A. The connection with the fixed pipe 34 is removed.
[0035]
Thereafter, a part of the central portion of the first tray 2 is removed, and the operator can drop the catalyst 100 in the through hole 15 by using an air pick or the like on the catalyst 100 of the upper bed 7. The crushed catalyst 100A is sequentially put into the through hole 15. When all of the catalyst 100 of the upper bed 7 is crushed and put into the through hole 15 and extracted from the catalyst extraction nozzle 13, a part of the central part of the first partition plate 5 and the second tray 3 is removed. Then, as described above, the catalyst 100 of the middle bed 8 is crushed, and the crushed catalyst 100A is put into the through hole 15 and extracted. Subsequently, the catalyst 100 in the lower bed 9 is extracted, and all extraction of the catalyst in the reaction tower 1 is completed.
[0036]
According to this embodiment, there are the following effects.
(1) After the catalyst 100 in the reaction tower 1 is crushed with an air pick or the like, the crushed catalyst 100A (see FIG. 3) is opened in the catalyst 100 and in a vertical hole 16 communicating with the catalyst extraction nozzle 13. It can be extracted simply by loading. Therefore, as compared with the conventional case where the crushed material is extracted to the outside of the reaction tower 1 by vacuum suction, it is not necessary to perform the suction work, so that labor can be reduced and the work efficiency can be improved. At the same time, since it requires less manpower, labor costs can be reduced and costs can be reduced.
[0037]
(2) Since the catalyst 100 in the reaction tower 1 can be extracted simply by making a vertical hole 16 communicating with the catalyst extraction nozzle 13 and inserting the crushed catalyst 100A into the vertical hole 16, it can be extracted as compared with conventional extraction by vacuum suction. In this case, a special device such as a vacuum device is not required, and the cost is not increased. Therefore, the cost can be reduced.
(3) The excavated particles generated when drilling the catalyst 100 by the excavating part 24A of the boring head 21 is a gap between the outer diameter of the connecting pipe 28 and the pipe member 22 and the outer diameter of the excavating member 23 in the boring head 21. Since the air obtained from the vacuum is sucked from the inside of the pipe member 22, the drilling particles are not entangled with the drilling member 23 or the like and clogged in the gap, and the drilling operation is facilitated.
[0038]
(4) When the deep vertical hole 16 reaching the oblique hole 17 is made in the catalyst 100 in the reaction tower 1, a connecting pipe 28 is sequentially added to the boring head 21, and the connecting pipe 28 is, for example, 1.5 m to 2 m. Since it is formed to a certain length, the handling of the connecting pipe 28 is easy, and as a result, the connecting and removing operations of the connecting pipe 28 are facilitated.
(5) Since the crushed catalyst 100A is sized so that it can fall through the through-hole 15, it can be extracted at that size, and the recovery yield is nearly 100%. Can be performed efficiently.
[0039]
Next, a second embodiment of the present invention will be described based on FIG.
In the following embodiments including this embodiment, the same structure and the same members as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
The present embodiment is different only in that the hole formed in the catalyst 100 in the upper bed 7 is larger than that in the first embodiment.
[0040]
A large-diameter hole 56 in the catalyst 100 in the upper bed 7 can be opened by an auger head 57 having an outer diameter of, for example, 500φ as shown in FIG. The auger head 57 is formed by attaching a head member 58 to the tip of a pipe member 22 having a predetermined outer diameter. The head member 58 is formed by arranging, for example, four blade members 58A to 58D in a cross shape. Has been. On the distal end side of the head member 58, an excavation part 54A formed by attaching a predetermined cutter to a saw blade-like cut part is provided, and a drill 55 is provided at the distal end of the excavation part 54A. . The auger head 57 is also driven by the driving means 30. And the 1st tray 2 can pass the auger head 57 by removing a part of center part, for example.
Further, the catalyst 100 of the middle bed 8 and the lower bed 9 is provided with a through hole 15 including the vertical hole 16 and the oblique hole 17.
[0041]
In order to remove the spent catalyst in the second embodiment, first, a part of the central portion of the first tray 2 is removed, passed through the auger head 57, and then the auger head 57 is driven by the driving means 30. Is lowered to make a large diameter hole 56 of 500φ.
Next, the boring head 21 is inserted while being guided by the large-diameter hole 56, and the vertical hole 16 and the diagonal hole 16 are obliquely inserted into the catalyst 100 of the middle bed 8 and the lower bed 8 by the same procedure as in the first embodiment. A through hole 15 formed by a hole 17 is formed.
Then, after making the through hole 15, the crushed catalyst 100 </ b> A is sequentially put into the through hole 15 and extracted from the catalyst extraction nozzle 13.
[0042]
According to such 2nd Embodiment, there exist the following effects other than the effect similar to said (1)-(5).
(6) Since the auger 57 has a hole larger than the vertical hole 16, for example, a large diameter hole 56 of 500φ, formed in the catalyst 100 in the upper bed 7, the boring head 21 is transferred from the large diameter hole 56. It can be easily inserted into the pipe 10 and can be accurately positioned in the vertical direction with respect to the catalyst 100 of the intermediate bed 8.
(7) Since the large-diameter hole 56 is formed in the catalyst 100 in the upper bed 7, the vertical hole 16 having a smaller diameter than the large-diameter hole 56 is formed from the upper bed 7 to the lower bed 9. Compared to the configuration, when the large-diameter hole 56 is opened, the catalyst 100 is extracted by the difference in diameter between the large-diameter hole 56 and the vertical hole 16, and as a result, even a little extraction work is performed. You can expedite.
[0043]
Next, a third embodiment of the present invention will be described based on FIG.
In the present embodiment, the catalyst 100 in the upper bed 7 is crushed with an air pick or the like, and after being extracted from the upper manhole 1A of the reaction tower 1 with a vacuum hose as in the prior art, the catalyst 100 in the middle bed 8 As with the upper bed 7 of the second embodiment, a large-diameter hole 56 is made with a 500φ auger head 57, and a 220φ vertical hole 16 is made in the catalyst 100 of the lower bed 9 with the boring head 21. Note that the auger head 57 can be passed through the second tray 3 by removing a part of the central portion, for example.
[0044]
In order to extract the spent catalyst in the third embodiment, first, the catalyst 100 in the upper bed 7 is crushed with an air pick or the like and extracted from the upper manhole 1A of the reaction tower 1 with a vacuum hose. After the auger head 57 is passed by removing a part of the central portion of the second tray 3, the auger head 57 is lowered by the driving means 30 to open a large-diameter hole 56 of 500φ.
[0045]
Next, the boring head 21 is inserted into a large-diameter hole 56 having a diameter of 500 φ from the upper bed 7 which is a space, and the vertical hole 16 is formed in the catalyst 100 of the lower bed 9 by the same procedure as in the first embodiment. I can make it.
Then, the crushed catalyst 100 </ b> A of the middle bed 8 and the lower bed 9 is sequentially put into the through hole 15 through the large-diameter hole 56 of 500 φ and is taken out from the catalyst removal nozzle 13.
[0046]
According to the third embodiment, in addition to the same effects as the above (3) to (4), there are the following effects.
(8) With the exception of the upper bed 7, the same effects as in the above (1) and (2) can be obtained at the lower bed 9, and the same as the above (6) at the middle bed 8. An effect can be obtained.
[0047]
Next, a fourth embodiment of the present invention will be described based on FIG.
In this embodiment, the catalyst 100 in the upper bed 7 and the middle bed 8 is crushed with an air pick or the like, and after being extracted from the upper manhole 1A of the reaction tower 1 with a vacuum hose as in the prior art, the catalyst in the lower bed 9 is then removed. In the same manner as the upper bed 7 of the second embodiment and the middle bed 8 of the third embodiment, a hole is formed in 100 with an auger head 57 of 500φ.
[0048]
In order to extract the spent catalyst in the fourth embodiment, first, the catalyst 100 in the upper bed 7 and the middle bed 8 is crushed by an air pick or the like, and the vacuum is sequentially increased from the upper manhole 1A of the reaction tower 1. After extracting with the hose, a part of the central portion of the third tray 4 is removed and passed through the auger head 57, and then the auger head 57 is lowered by the driving means 30 and a large diameter hole of 500φ is formed in the lower bed 9 Open 56. Next, the catalyst 100 in the lower bed 9 is crushed and put into a large-diameter hole 56 having a diameter of 500 φ and is taken out from the catalyst removal nozzle 13.
According to such 4th Embodiment, the effect similar to said (6) can be acquired.
[0057]
  The present invention is not limited to the above-described embodiments, and may be the following embodiments as long as the object of the present invention can be achieved.
  For example, the first and first2 fruitsIn the embodiment, the outer diameter of the drilling portion of the boring head 21 is 220φ, and the pipe member 22 is 5B size, but is not limited thereto. Depending on the size of the transfer pipe provided for each stage, the outer diameter of the drilling portion of the boring head 21 may be 220φ or more, and may be 220φ or less. And according to it, you may change the size of the pipe member 22 suitably. However, the pipe member 22 must be smaller than the outer diameter of the excavation part, and there must be a predetermined gap between them.
[0058]
The auger head 57 used in the second to fourth embodiments has an outer diameter of 500φ, but the size is not limited. Depending on the size of the transfer pipe provided for each case, it may be larger than the transfer pipe, for example, 600φ.
[0059]
  Further, the firstAnd the third embodimentThe reaction etc. 1 has a three-layer structure comprising an upper bed 7, a middle bed 6, and a lower bed 9, but the catalyst extraction apparatus 10 in the reaction tower of the present invention has a multilayer structure of two or more layers. It can be used for the tower.
[0060]
【The invention's effect】
As described above, according to the method for extracting a catalyst in a reaction tower of the present invention, after making a through hole in the catalyst and crushing sequentially from the catalyst near the upper end of the through hole, the crushed catalyst is put into the through hole. For example, the catalyst is extracted from the catalyst extraction port by natural fall. As a result, the crushed catalyst can be extracted just by putting it into the through hole, so that the working efficiency can be improved. In addition, the crushed catalyst is sucked from the upper part of the reaction tower by a vacuum device as in the conventional case. Since this is not necessary, a vacuum apparatus is not necessary, and cost can be reduced.
In addition, since the crushed catalyst is put into the through hole, dropped and extracted, it is possible to prevent the catalyst generated due to the intense vacuum suction speed from colliding with each other and further crushed finely. . Therefore, the loss of the catalyst can be reduced, and the yield of recovering the reusable catalyst can be improved.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view showing a reaction tower of a first embodiment to which a method for extracting a catalyst in a reaction tower according to the present invention is applied.
FIG. 2 is an exploded perspective view showing a main part of the embodiment.
FIG. 3 is a longitudinal sectional view showing a procedure of a catalyst extraction method in the embodiment.
FIG. 4 is an overall longitudinal sectional view showing a reaction tower of a second embodiment to which the method for extracting a catalyst in the reaction tower according to the present invention is applied.
FIG. 5 is an exploded perspective view showing a main part of the second embodiment.
FIG. 6 is an overall longitudinal sectional view showing a reaction tower of a third embodiment to which a method for extracting a catalyst in a reaction tower according to the present invention is applied.
FIG. 7 is an overall longitudinal sectional view showing a reaction tower of a fourth embodiment to which a method for extracting a catalyst in a reaction tower according to the present invention is applied.The
[Explanation of symbols]
      1 reaction tower
      7 Upper bed
      8 middle beds
      9 Upper bed
    13 Catalyst extraction nozzle as catalyst extraction port
    15 Through hole
    16 Vertical hole
    17 Oblique hole
    20 Catalyst drilling device
    21 Boring head
    22 Pipe members
    23 Drilling parts

Claims (3)

A method for extracting a used catalyst from a reaction tower, wherein a used catalyst is extracted from the inside of the reaction tower,
Wherein the spent catalyst in the reaction column, a vertical hole drilled from the upper end through a longitudinal center of said reaction tower, Katsu over and the vertical hole bottom portion touching the together for continuous to medium withdrawal of a first step that opened a through hole having an oblique hole to be drilled at an angle relative to the longitudinal center,
A second step of crushing the catalyst to a size capable of passing through the through hole from the catalyst in the vicinity of the upper end of the through hole, after opening the through hole ;
A third step of sequentially charging the crushed catalyst into the through hole and extracting from the catalyst outlet ;
In the first step, the vertical hole is made by a drilling device that drills the catalyst from the upper end of the catalyst toward the intersection with one end of the oblique hole,
The drilling device includes a boring head, driving means for driving the boring head to be rotatable and pressable, and catalyst excavation particles generated when the vertical hole is drilled by the boring head, and a pipe member constituting the boring head. Vacuum suction means for vacuum suction from the inside,
The boring head is composed of the pipe member and a drilling member provided at the tip and outer periphery of the pipe member, and the drilling member is arranged radially around the pipe member, and the front side in the drilling direction is tapered. A plurality of blade members in which saw blade-like cut portions are formed in the inclined portions, and drill portions fixed to the tips of these blade members, and when rotated, from the outer diameter of the pipe member A method for extracting a spent catalyst in a reaction tower, characterized in that large-diameter hole machining is possible . 2. The method for extracting a spent catalyst in a reaction tower according to claim 1 , wherein the pipe member of the boring head has a plurality of connecting pipes having substantially the same outer diameter as the pipe member and connectable. A method for extracting a spent catalyst in a reaction tower, wherein the vertical holes are drilled while the connecting pipe is sequentially added to the pipe member of the boring head. 3. The method for extracting a spent catalyst in a reaction tower according to claim 1 or 2 , wherein the oblique hole is opened before the vertical hole is made.

Images