JPH0788450A - Removing device for adherent inside piping - Google Patents

Abstract

PURPOSE:To provide the title device enabling removal work under continuous operation, capable of preventing the loss of a raw material caused by the venting of a container, capable of achieving the reduction of the number of parts, enhancement of workability and safety and speeding-up and capable of preventing the complication of the device or control. CONSTITUTION:When stable supply becomes impossible because the passage of a feed nozzle is narrowed by the adhesion and fusing adhesion of a powdery solid on the inner peripheral surface of the nozzle 1, the inert gas shown by an arrow flows in the feed nozzle 1 from a supply pipe 32 through a Y-shape pipe 3. Next, a slow feed air motor 21 is driven to rotate a feed screw 11 and a second drive mechanism 23 is advanced toward a frame 9 accompanied by the rotation of the feed screw 11 and the driving of an air motor 33 is started. A cutting shaft 26 is rotated on the basis of the driving of the air motor 33 and a drill 31 is rotated while advanced along with the cutting shaft 26 to cut and remove the powdery solid adhered and fusedly adhered on the inner peripheral surface of the feed nozzle 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing deposits in a pipe used in a manufacturing plant or the like, and more particularly, it is possible to remove deposits in a pipe that narrows or blocks the inside of the pipe. The present invention relates to a device for removing deposits in a pipe.

[0002]

2. Description of the Related Art For example, in a polymer production plant, a powdery solid substance having a polymerization reaction performance, for example, a polymerization catalyst (hereinafter, simply referred to as a catalyst) is used, and this catalyst is usually about 5 to 200 μm. And flows into the reactor downstream from the upstream through the pipe for transportation. And
When the polymerization reaction of olefins such as ethylene, propylene, or butene-1 is started with the catalyst as the nucleus and the catalyst is discharged from the reactor, it usually grows into powder having a size of about 100 to 2000 microns. .

By the way, as described above, since the catalyst itself has a growth property due to polymerization and is an exothermic reaction, the inside temperature of the pipe in the vicinity of the reactor is almost the same as the reaction temperature inside the inflow pipe. Since the reaction conditions are set,
It may adhere to the inner peripheral surface of the pipe over time and polymerize to narrow the flow path, or in the worst case, block the flow path, causing a problem such that the polymerization reaction can no longer continue. .

Various methods can be considered to solve this problem, and the following three methods are typical methods. First, the first method is to prepare a large number of pipes, switch to another new pipe at each blockage to continue distribution, and pull out the blocked pipes when the manufacturing plant is stopped to allow the worker to attach and fuse them. The catalyst and the polymerized product thereof are removed.
The second method is to prevent the catalyst from adhering and fusing by changing the catalyst transportation rate, and the third method is to cool the pipe where the catalyst is expected to adhere and fusing to carry out the reaction. It was a delay.

[0005]

The conventional removal of the catalyst and the polymer was carried out as described above, but in the first method, a large number of pipes had to be prepared and the reactor was used for the removal. After degassing the gas inside, the operator must pull out the clogged pipe to remove the adhered / fused catalyst and its polymerized products, so removal under continuous operation, reduction of the number of parts, workability of work・ There was a problem that it was not possible to improve safety and speed up.
Further, in the second method, since the catalyst transportation speed has to be changed, there is a problem that the apparatus and control are complicated. Further, in the third method as well, there is a problem in that the piping must be cooled where the adhesion and fusion of the catalyst are expected to be cooled down, and the apparatus must be complicated.

The present invention has been made in view of the above, and enables removal work under continuous operation and reduces the number of parts,
An object of the present invention is to provide a device for removing deposits in a pipe, which can improve workability and safety of work, speed up work, and the like, and can prevent the device and control from becoming complicated.

[0007]

In order to achieve the above-mentioned object in the present invention, a pipe through which a powdery solid material is circulated and a cutting portion inserted in this pipe are rotated to adhere to the inside of the pipe or An adhering matter removing means for cutting the fused powdery solid matter, and at least discharging the cut powdery solid matter which has flowed into the pipe at the time of cutting the powdery solid matter from the pipe And a blow gas for preventing backflow of the deposit in the direction of the deposit removing means.

In order to achieve the above-mentioned object in the present invention, the adhering matter removing means is provided with a power transmitting member that rotates with the driving of the first driving means, and a pipe with the rotation of the power transmitting member. Second drive means that moves back and forth in the axial direction, a cutting shaft that rotates inside the pipe when the second drive means is driven, and a cutting shaft that is attached to the tip of the cutting shaft and adheres or melts inside the pipe. It is configured to include a cutting portion for cutting the powdery solid matter and a gas injection hole that is formed in the cutting shaft and guides the exhaust gas from the rear to the front of the cutting portion.

Further, in the present invention, in order to achieve the above object, a rotatable guide ring for preventing whirling of the cutting shaft inside the pipe is fitted to the tip of the cutting shaft. .

[0010]

According to the present invention having the above-described structure, when the powdery solid substance adheres to and is fused to the inside of the pipe, the first drive means drives to rotate the power transmission member. With the rotation, the second drive means moves forward in the axial direction of the pipe, and the second drive means starts driving. Then, the cutting shaft rotates, and the cutting portion rotates while advancing together with the cutting shaft to cut and remove the powdery solid matter adhered and fused to the inner surface of the pipe. Further, at the time of cutting the cutting portion, blow gas flows through the gas injection holes and is jetted toward the cutting portion, so that the powdered solid matter that has been cut and removed is smoothly pumped in the discharge direction.

Further, according to the present invention having the above-mentioned structure, since the guide ring is rotatably fitted in the tip of the cutting shaft, whirling of the tip of the cutting shaft in the pipe can be prevented. It is possible to prevent damage to the inner surface of the pipe due to the cutting portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in FIGS. In the following description, "catalyst" and "catalyst C (catalyst and its polymer)" are used separately.

As shown in FIG. 1, the apparatus for removing deposits in a pipe according to the present invention includes a feed nozzle 1 for circulating a catalyst,
Insert the drill 31 of the attached matter removing device 8
Catalyst C fused to the inner surface of feed nozzle 1 by rotating 1 (powdered solid, or polymerization catalyst and its polymer)
The catalyst C is cut by feeding an inert gas such as nitrogen through the supply pipe 32 into the feed nozzle 1 during the cutting.
Is discharged from the feed nozzle 1 and the backflow of the catalyst C toward the deposit removing device 8 is prevented.

As shown in the figure, the feed nozzle (pipe) 1 is composed of an elongated pipe having the same diameter and a small diameter. The downstream end of the left end is connected to the wall 2 of the reactor in a penetrating state, and the right end The upstream end is connected to the Y-tube 3. This Y
A manual valve 4 for closing the flow of the catalyst at the time of cutting is connected to the inclined upper end of the character tube 3. Therefore, the catalyst always flows into the reactor from the upstream through the manual valve 4, the Y-tube 3, and the feed nozzle 1 in this order. Also, Y
A ball valve 6 which is loosely penetrated by the cutting shaft 26 of the deposit removing device 8 is horizontally connected to the other end of the character tube 3 which is oriented in the horizontal direction. The front mounting flange 7 is connected horizontally. The ball valve 6
Can be closed during repair of the deposit removing device 8 during operation.

On the other hand, the adhering substance removing device (adhering substance removing means) 8 is provided with a frame 9 which is horizontally hung or supported, as shown in FIG. Drive mechanism 18 for rotating the screw and feed screw 1
A second drive mechanism 23 that moves back and forth in the axial direction of the feed nozzle 1 in accordance with the rotation of the feed nozzle 1 is provided, and the cutting shaft 26 rotates inside the feed nozzle 1 when the second drive mechanism 23 is driven. It has become. Frame 9
Has a horizontally long cylindrical shape, and a grounding stand 10 that can move up and down is vertically provided on the lower portion thereof.

The feed screw (power transmission member) 11 is horizontally mounted between the front surface and the back surface of the frame 9 and is rotatably disposed below the inside of the frame 9. The front end of the feed screw 11 has a front bearing 12 and a lock nut 13.
It is supported and fixed by. On the other hand, the rear portion of the feed screw 11 is rotatably supported by the bearing 12A on the rear surface, and the rear end portion 1
1a has a slightly reduced diameter, and its rear end 11a penetrates the back surface of the frame 9 and projects rearward. The rear end portion 11a of the feed screw 11 has a bevel gear 1
4 and the first clutch pawl 15 are fitted together, and the rearmost end 11a thereof is inserted into the hole of the second clutch pawl 16 described later. The bevel gear 14 is freely rotatably fitted to the rear end portion 11a of the feed screw 11 via a bearing 12B, and a coupling magnet 17 is attached to the facing surface facing the first clutch pawl 15. . Further, the first clutch pawl 15
Has a substantially cylindrical shape, the central portion of the peripheral surface is cut out to have a reduced diameter, and magnets 17A for coupling are attached to both end surfaces thereof. Then, the feed screw 11 is slidably fitted to the rear end portion 11a of the feed screw 11 via a slide key K, and is slid in the axial direction of the feed screw 11 in a state in which the rotation is restricted in accordance with the operation of a clutch lever 22 described later. It has a function of moving to be coupled with the bevel gear 14 or the second clutch claw 16 and transmitting the driving force to the feed screw 11.

As shown in FIG. 2, the first drive mechanism (first drive means) 18 is provided with a horizontally long cylindrical housing 19 which is horizontally attached to the lower rear portion of the frame 9, A fast feed air motor 20 and a slow feed air motor 21 are arranged in the housing 19, and the feed screw 11 is rotated at a high speed, a low speed, a forward rotation, or a reverse rotation based on alternative driving of these air motors 20 and 21. It has the function of A clutch lever 22 is swingably mounted on an upper portion of the housing 19, and a lower end portion of the clutch lever 22 is slidably engaged with a reduced diameter portion of a peripheral surface of the first clutch pawl 15. The fast-forward air motor 20 is horizontally mounted on the back surface of the housing 19, and the output shaft thereof is fitted with the second clutch pawl 16 located in the housing 19. A coupling magnet 17B is attached to the facing surface facing the clutch pawl 15. Further, the slow-feed air motor 21 is vertically mounted on the upper part of the housing 19 and has a function of operating the speed reducer 34. The output shaft of the speed reducer 34 is fitted with a bevel gear 14A meshing with the bevel gear 14. There is. The slow feed air motor 21 and the fast feed air motor 2
0 and 0 are used when the forward speed during cutting is adjusted, the forward speed is adjusted by using the slow feed air motor 21, and when the cutting shaft 26 is moved backward after the cutting is completed, the fast feed air motor is used. This is because the use of 20 shortens the working time.

The second drive mechanism (second drive means)
As shown in FIG. 2, 23 includes a speed reducer 24 that increases the driving force of the air motor 33, and the speed reducer 24 is arranged inside the frame 9. The speed reducer 24 is supported by a plurality of guides 25 in a penetrating state, and the lower portion thereof is attached to the feed screw 1
1 has a function of sliding in the front-back direction of the frame 9 while being guided by a plurality of guides 25 as the feed screw 11 rotates.

Further, the cutting shaft 26 is composed of an elongated shaft as shown in the figure and is connected to the output shaft of the speed reducer 24. The cutting shaft 26 freely penetrates the mounting flange 7 and the ball valve 6 to form a Y-shape. It is loosely inserted in the tube 3. As shown in FIG. 4, a ring-shaped guide ring 28, which is positioned by a ring-shaped stop ring 27, is freely rotatably fitted to the tip of the cutting shaft 26, and this guide ring 28 is fed to the feed nozzle 1.
It has a function of preventing whirling of the cutting shaft 26 inside, in other words, preventing damage to the inner peripheral surface of the feed nozzle 1 by the drill 31. The guide ring 28 is formed to have a diameter larger than that of the cutting shaft 26, and is configured to rotate with sliding contact with the inner peripheral surface of the feed nozzle 1. Also,
As shown in FIG. 4, the gas injection hole 2 is provided at the tip of the cutting shaft 26.
9 is obliquely provided, and this gas injection hole 29 has a function of guiding and injecting the inert gas indicated by the arrow from the rear toward the front of the drill 31. As shown in FIG. 3, the mounting flange 7 is provided with a bearing 12C that supports the cutting shaft 26, and is screwed to the front surface of the frame 9. Further, as shown in FIG. 2, the mounting flange 7 has an O for preventing the gas in the reactor and the high-pressure inert gas from leaking to the atmosphere.
A ring 30 is attached.

Further, as shown in FIGS. 4 and 5, the above-mentioned drill (cutting portion) 31 is composed of a sharp cutting tool and is screwed to the most distal end portion of the cutting shaft 26, and the Y-shaped tube 3 is always provided. At the start position (position near the connecting portion between the Y-shaped pipe 3 and the supply pipe 32 shown by W in FIG. 1), and at the time of cutting, the cutting shaft 2
It has a function of cutting and removing in the direction of the arrow in FIG. 4, the catalyst C which is rotated together with 6 and fused to the inner peripheral surface of the feed nozzle 1. The cutting blade of the cutting tool is configured such that the end surface on the radial direction side is rounded so as not to cut the inner peripheral surface of the feed nozzle 1, and is screwed through a fixing bolt. The drill 31 waits at the start position of the Y-shaped pipe 3 at the start of the cutting work and during the normal operation, by positioning the drill 31 as a blockage toward the feed nozzle 1 during the normal operation as much as possible. This is based on the reason that the reverse flow of the catalyst during normal operation is prevented by constantly flowing a small amount of inert gas through the supply pipe 32.

On the other hand, the above-mentioned inert gas (blow gas)
Is the supply pipe 32 during cutting, as indicated by the arrows in FIGS.
To the lower part of the Y-tube 3 at a high pressure to feed the feed nozzle 1
The catalyst C, which was circulated and flowed again to the feed nozzle 1 through the gap between the feed nozzle 1 and the cutting shaft 26, and the gas injection hole 29 to be cut and removed again, was pressure-fed to the reactor and was also cut and removed. It has a function of preventing the catalyst C from flowing back into the frame 9 via the Y-tube 3, the ball valve 6 and the mounting flange 7 in order.

Next, the operation will be described.

When the catalyst C is fused to the inner peripheral surface of the feed nozzle 1 to narrow the flow passage, first, an operator (not shown) closes the manual valve 4, while the normal operation is performed from the supply pipe 32 to Y. The amount of the inert gas flowing into the lower portion of the character tube 3 at a high pressure is increased, and the inert gas is passed through the feed nozzle 1. Then, the air motor 33 of the second drive mechanism 23 is driven to idle the cutting shaft 26, and it is confirmed whether or not the cutting shaft 26 rotates smoothly. Next, the slow-feed air motor 21 is driven to rotate the bevel gear 14A via the reduction gear 34, and the bevel gear 14 meshed with the bevel gear 14A.
Rotates to rotate the feed screw 11,
The second drive mechanism 23 advances in the axial direction while being guided by the plurality of guides 25 with the rotation of the.

When the air motor 33 of the advancing second drive mechanism 23 is driven in this way, the speed reducer 24 is also driven to rotate the cutting shaft 26, and the drill 31 is rotated together with the cutting shaft 26 while moving forward to rotate the feed nozzle 1. The catalyst C fused to the inner peripheral surface is cut and removed in the direction of the arrow in FIG. At the time of this cutting / removal, since the guide ring 28 is fitted into the tip of the cutting shaft 26 so as to be freely rotatable, the whirling of the tip of the cutting shaft 26 in the feed nozzle 1 can be stated in other words. It is possible to prevent the inner peripheral surface of the feed nozzle 1 from being damaged by the drill 31. Further, when the drill 31 is cut, the inert gas is circulated through the gap between the feed nozzle 1 and the cutting shaft 26 and the gas injection hole 29 and is constantly injected toward the drill 31. It is possible to prevent the catalyst C, which has been smoothly fed under pressure and cut and removed, from flowing back into the frame 9 via the Y-shaped tube 3, the ball valve 6 and the mounting flange 7 in order.

Next, after confirming the completion of the cutting and removal of the catalyst C by the moving amount of the cutting shaft 26, the slow-feed air motor 21 is stopped and the air motor 33 of the second drive mechanism 23 is stopped. These slow-feed air motors 21
When the stop of the air motor 33 is confirmed, an operator (not shown) swings the clutch lever 22 to switch the transmission of power from the slow-forward air motor 21 to the fast-forward air motor 20 to drive the fast-forward air motor 20 in the reverse direction. Then,
The fast-forward air motor 20 is driven in reverse to drive the second clutch pawl 1
6 is rotated in the reverse direction, and the feed screw 11 is also rotated in the reverse direction. With the reverse rotation of the feed screw 11, the second drive mechanism 2 is rotated.
3 is retracted and returned to the original position while being guided by the plurality of guides 25.

In this way, the drill 31 retracts together with the cutting shaft 26 and returns to the original starting position near the connection between the supply pipe 32 and the Y-shaped pipe 3. Finally, the inflow amount of the inert gas can be reduced to the original state, and the work of cutting and removing the catalyst C can be completed.

Incidentally, the ball valve 6 can be closed by further retracting the drill 31 together with the cutting shaft 26 from the normal standby position to the inside of the ball valve 6 at the time of repair or the like as required. It can be performed.

According to the above construction, the drill 31 inserted into the feed nozzle 1 is rotated to cut and remove the catalyst C fused to the inner peripheral surface of the feed nozzle 1, and an inert gas is caused to flow into the feed nozzle 1 during this cutting. Since the catalyst C is discharged from the feed nozzle 1 to the reactor, it is necessary to prepare a large number of pipes or the continuous operation is stopped, and after degassing, the worker pulls out the pipes clogged and attached / fused C
It is possible to certainly omit the work of removing.
Therefore, it is possible to perform the removal work under continuous operation, and further, it is possible to significantly reduce the number of parts, significantly improve the workability and safety of the work, and speed up the work. Also,
Since there is no need to change the transport speed of the catalyst C, it can be expected to prevent the apparatus and control from becoming complicated. Furthermore, since there is no need to cool the piping where catalyst adhesion / fusion is expected,
It is possible to prevent the device from becoming complicated.

During normal operation, a small amount of inert gas is constantly flowing, and the drill 31 is already waiting at the start position near the connection between the supply pipe 32 and the Y-shaped pipe 3. Since 31 plays a role of preventing most of the dead space, it is possible to flow a small amount of the inert gas that is constantly flowing,
It is possible to prevent the catalyst from flowing back toward the frame 9 during the normal operation. When the drill 31 is cut and removed, the guide ring 28 is fitted into the tip of the cutting shaft 26 so that the guide ring 28 can freely rotate. Therefore, it can be expected that the drill 31 will prevent damage to the inner peripheral surface of the feed nozzle 1. further,
At the time of cutting the drill 31, the inert gas circulates through the gas injection hole 29 and is continuously injected in the direction of the drill 31, so that the catalyst C that has been cut and removed has the Y-shaped tube 3, the ball valve 6 and the mounting flange 7. It is possible to surely prevent the backflow to the frame 9 side via the above.

In the above embodiment, the feed nozzle 1 located near the reactor has been described as an example, but the present invention is not limited to this, and a powdery solid substance such as a powdery additive may be used. Any pipe that adheres, fuses, or sticks can be easily applied to pipes at other locations. Further, in the above embodiment, the one in which the drill 31 formed of a cutting tool having one blade is used is shown, but the drill 31 formed of a cutting tool having a plurality of blades may be used, and the same function is provided. Other cutting tools may be used as long as they have them. Further, in the above-mentioned embodiment, the one using a plurality of air motors 20, 21, and 33 as the drive source is shown, but other types of motors may be used as long as they have similar functions. Needless to say. Further, in the above-mentioned embodiment, the case where the inert gas is made to flow into the feed nozzle 1 at the time of cutting is shown, but the present invention is not limited to these, and other kinds of gas are made to flow at a time other than the time of cutting, etc. Even if the transportation of the solid material is facilitated, the same effects as those of the above-described embodiment can be obtained.

[0031]

As described above, according to the present invention, it is possible to perform the removing work under continuous operation, and it is not necessary to degas the gas in the container, so that it is possible to prevent the loss of the raw material, and further, to reduce the number of parts and the work. There is a remarkable effect that it is possible to improve workability / safety and speed up. Further, since there is no need to change the transport speed of the catalyst, it is possible to expect the prevention of complication of the device and control, which is a special effect.
Then, during cutting, the blow gas flows through the gas injection holes and is injected toward the cutting portion, so that there is a great effect that it is possible to prevent the catalyst that has been cut / removed and the polymer thereof from flowing back. Further, there is an excellent effect that it can be expected to prevent damage to the inner surface of the pipe by the cutting portion.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment of an apparatus for removing deposits in piping according to the present invention.

FIG. 2 is an explanatory view showing an embodiment of the apparatus for removing deposits in piping according to the present invention.

FIG. 3 is an enlarged explanatory view showing a front end of a mounting flange and a feed screw in a portion III of FIG.

FIG. 4 is an explanatory view showing a cutting shaft and a drill at the time of cutting by the in-pipe deposit removing device according to the present invention.

FIG. 5 is an enlarged front view showing a drill in a V portion of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Feed nozzle, 8 ... Adhesion removing device, 11 ... Feed screw, 18 ... First drive mechanism, 23 ... Second drive mechanism, 26
... Cutting axis, 28 ... Guide ring, 29 ... Gas injection hole, 3
1 ... Drill, C ... Catalyst and its polymer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Tamura 5-1 Anezaki Kaigan, Ichihara City, Chiba Prefecture Sumitomo Chemical Co., Ltd. 7 (72) Inventor Akihiro Hamashima 567-3 Kusuo, Yukuhashi City, Fukuoka Prefecture

Claims (4)

[Claims] 1. A pipe through which a powdery solid substance is circulated, and an adhering substance removing means for rotating a cutting part inserted into this pipe to cut off the powdery solid substance adhered or fused inside the pipe. A blow gas that at least discharges the cut powdery solid matter that has flowed into the pipe when cutting the powdery solid matter and discharges the cut powdery solid matter from the pipe, An apparatus for removing deposits in piping, which is characterized by being provided. 2. The deposit removing means includes a power transmitting member that rotates with the driving of the first driving means, and a second driving means that moves forward and backward in the axial direction of the pipe as the power transmitting member rotates. A cutting shaft that rotates inside the pipe in accordance with the driving of the second driving means, and a cutting unit that is attached to the tip of the cutting shaft and cuts the powdery solid matter adhered or fused inside the pipe. 2. The in-pipe deposit removing device according to claim 1, further comprising a gas injection hole which is formed in the cutting shaft and which guides exhaust gas from a rear direction toward a front cutting portion. 3. The pipe deposit removing device according to claim 1, wherein the powdery solid substance is a polymerization catalyst and a polymerized product of the catalyst. 4. A pipe foreign matter removing device according to claim 2, wherein a rotatable guide ring for preventing whirling of the cutting shaft inside the pipe is fitted at the tip of the cutting shaft. .