Catalytic cracking cold wall slide valve filler leakage repairing device

Abstract

A catalytic cracking cold wall slide valve filler leakage repairing device comprises an external filler box and a rear gland, the external filler box is of an integrated structure, a filler cavity is formed in the inner wall of the external filler box, and the rear gland is detachably connected with the external filler box; when the external packing box and the cold-wall sliding valve device are installed, one end of the external packing box is detachably connected with the rear end of the original packing box, the other end of the external packing box is matched with a partition plate of the transmission box body, and a valve rod of the cold-wall sliding valve is arranged in the external packing box in a penetrating mode. The device can be installed on site in real time, installation is easy, operation is convenient, fire operation is not needed, operation safety is improved, long-period safe operation can be met after installation, and the possibility of huge loss caused by the fact that leakage accidents cannot be repaired rapidly can be greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of cold wall slide valves of heavy oil catalytic devices, and in particular relates to a catalytic cracking cold wall slide valve packing leakage repairing device. Background Art

[0002] PetroChina Jinxi Petrochemical Company 1.8×10 6 The t / a heavy oil catalytic cracking unit is equipped with a total of 6 cold wall sliding valves produced by Lanzhou Petroleum Machinery Plant. The cold wall sliding valve is installed on the inclined pipe of the catalytic cracking unit regenerator to control the regenerator pressure to keep it consistent with the reactor pressure. The opening of the cold wall sliding valve is based on the pressure difference between the regenerator and the reactor. The pneumatic signal is sent through the pneumatic pressure difference regulator to automatically adjust the hydraulic control unit on the cold wall sliding valve.

[0003] During operation, once the cold wall sliding valve has a valve stem packing failure and leakage, it needs to be handled as soon as possible to ensure safety and control losses. There are two common treatment methods: ① The device is shut down and the packing is replaced, but this method generally takes a long time to stop working, resulting in huge losses. ② No shutdown, that is, a spare packing box is welded at the rear end of the original packing box gland. Specifically, a thick mixture of grease, molybdenum disulfide and graphite is injected into the injection port of the original packing box, and an outer protective sleeve is welded at the rear end of the original packing box. However, this treatment method also has many difficulties: in the actual operation site, the installation operation is complicated, the installation and welding space is narrow, and the leaked high-temperature flue gas is mixed with catalysts. In this environment, it is very risky to perform hot work; in addition, during welding, the outer protective sleeve and the equipment body are prone to large deformation, resulting in a large coaxiality deviation between the outer protective sleeve and the actuator of the equipment body (even up to the millimeter level), which is very harmful to the equipment body and cannot meet the needs of long-term use of the equipment. The overall equipment still needs to be replaced later, so this method only delays the shutdown time. Summary of the invention

[0004] In order to ensure the long-term operation of the device and reduce the company's losses, the present invention provides an external stuffing box to solve the risk of slide valve leakage, improve the stuffing press-fitting method, and eliminate the hidden dangers of failure. The present invention proposes a catalytic cracking cold wall slide valve stuffing leakage repair device, the technical solution is as follows:

[0005] A catalytic cracking cold wall sliding valve packing leakage repair device comprises an external stuffing box and a rear pressure cover, wherein the external stuffing box is an integrated structure, a stuffing cavity is arranged inside the external stuffing box, and the rear pressure cover is detachably connected to the external stuffing box; when the external stuffing box and the cold wall sliding valve device are installed, one end of the external stuffing box is detachably connected to the rear end of the original stuffing box, the other end of the external stuffing box cooperates with the transmission box partition, and the valve stem of the cold wall sliding valve is penetrated into the external stuffing box.

[0006] Optionally, the external stuffing box includes a front end, a middle part and a tail end arranged in sequence, the central axis of the front end of the external stuffing box, the central axis of the tail end of the external stuffing box and the central axis of the middle part of the external stuffing box coincide with each other, and the diameter of the front end of the external stuffing box and the diameter of the tail end of the external stuffing box are both smaller than the diameter of the middle part of the external stuffing box; when the external stuffing box is detachably connected to the rear end of the original stuffing box, the front end of the external stuffing box is correspondingly inserted into the rear end of the original stuffing box.

[0007] Optionally, the front end outer wall of the external stuffing box is fixedly sleeved with an annular positioning plate which is integrally formed with the front end and protrudes outward, the central axis of the annular positioning plate coincides with the central axis of the front end of the external stuffing box, and a plurality of positioning holes are arranged on the plate surface of the annular positioning plate, and the plurality of positioning holes are arranged in an annular array with the central axis of the annular positioning plate as the center; when the external stuffing box is detachably connected to the rear end of the original stuffing box, the plate surface of the annular positioning plate abuts against the rear end of the original stuffing box, the positioning holes correspond one-to-one with the hole positions set at the rear end of the original stuffing box, and are fixed by bolts.

[0008] Optionally, a sealing packing ring and a spare packing ring are provided on the inner wall of the external packing box, and both the sealing packing ring and the spare packing ring are cavity structures with added packing, and a packing spacer ring for partitioning is provided between the sealing packing ring and the spare packing ring.

[0009] Optionally, the sealing packing ring, the packing spacer ring and the spare packing ring are arranged in sequence so as to form a step-type series structure on the inner wall of the external packing box.

[0010] Optionally, the static friction force of the packing is smaller than the valve stem thrust of the cold wall sliding valve.

[0011] Optionally, the tail end of the external stuffing box is provided with a plurality of first threaded holes, and the rear pressure cover includes a connecting portion and a positioning portion, and the positioning portion of the rear pressure cover is provided with a plurality of second threaded holes. When the rear pressure cover is detachably connected to the external stuffing box, the connecting portion of the rear pressure cover is inserted into the interior of the tail end of the external stuffing box, and the positioning portion of the rear pressure cover abuts against the tail end of the external stuffing box, and each of the first threaded holes is correspondingly communicated with a second threaded hole, and bolts are sequentially penetrated through the interior of the second threaded holes and the first threaded holes, and the rear pressure cover is detachably connected to the external stuffing box.

[0012] Optionally, an inner side of the front end of the external stuffing box is provided with a bevel.

[0013] The beneficial effects of the device of the present invention are:

[0014] (1) The external stuffing box is detachably connected to the rear end of the original stuffing box, so that the device can be installed immediately on site. The installation is simple and convenient, and no fire is required. The troubleshooting time is within 4 hours. Based on this, if each device is pre-installed in advance after maintenance, the troubleshooting time will be shortened to 15 minutes, which greatly avoids the possibility of leakage of high-temperature flue gas mixed with catalyst eroding the valve stem, causing the leakage accident to be unrepaired.

[0015] (2) The installation of this device can avoid unplanned emergency shutdowns caused by failures, save 15 days of shutdown time per time, reduce costs by more than 10 million yuan, and reduce the loss of oil slurry processing volume by 160-180T / h.

[0016] (3) The device has low processing cost, the material is easy to store and recyclable, and can be 100% pre-stocked.

[0017] (4) The feasibility calculation of the device has been carried out, and the quality of the device itself and its operation have met the design requirements; it can meet the requirements of long-term safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a catalytic cracking cold wall slide valve packing leakage repair device in this application;

[0019] Figure 2 for Figure 1 A magnified view of part A;

[0020] Figure 3 This is a schematic diagram of the structure of the annular positioning plate in this application;

[0021] Figure 4 This is a schematic diagram of the assembly positioning of the catalytic cracking cold wall slide valve packing leakage repair device during installation in this application.

[0022] Description of reference numerals:

[0023] 1. External stuffing box; 101. Front end; 102. Middle part; 103. Tail end; 2. Rear gland; 201. Connecting part; 202. Positioning part; 3. Glue injection hose interface; 4. Steam cooling protection pipe interface; 5. Sealing stuffing ring; 6. Spare stuffing ring; 7. Stuffing spacer ring; 8. Annular positioning plate; 9. Positioning hole; 10. First threaded hole; 11. Second threaded hole; 12. Valve stem; 13. Rear end of original stuffing box. DETAILED DESCRIPTION

[0024] Part I: Device Structure

[0025] refer to Figure 1-4The catalytic cracking cold wall slide valve packing leakage repair device designed by the present invention comprises an external packing box 1 and a rear pressure cover 2. The external packing box 1 is an integrated structure. The inner wall of the external packing box 1 is provided with a packing cavity. The top of the external packing box 1 is provided with a glue injection pipe interface 3 for installing a glue injection pipe and a steam cooling protection pipe interface 4 for installing a steam cooling protection pipe. The rear pressure cover 2 is detachably connected to the external packing box 1. When the external packing box 1 is installed with the cold wall slide valve device, one end of the external packing box 1 is detachably connected to the rear end 13 of the original packing box, and the other end of the external packing box 1 cooperates with the transmission box body partition, and the valve stem 12 of the cold wall slide valve is penetrated into the external packing box 1.

[0026] The external stuffing box 1 includes a front end 101, a middle part 102 and a tail end 103 which are integrally formed and arranged in sequence. The inner side of the front end 101 of the external stuffing box 1 is provided with a bevel, which can play a guiding role when it is inserted and matched with the valve stem 12 during installation. An annular positioning plate 8 is sleeved on the outer wall of the front end 101 of the external stuffing box 1, and the annular positioning plate 8 is fixedly connected to the front end 101 of the external stuffing box 1 and integrally formed with the front end 101 of the external stuffing box 1. The central axis of the annular positioning plate 8 coincides with the central axis of the front end 101 of the external stuffing box 1. A plurality of positioning holes 9 are provided on the plate surface of the annular positioning plate 8 (four positioning holes 9 are provided in the present embodiment), and the plurality of positioning holes 9 are arranged in an annular array with the central axis of the annular positioning plate 8 as the center. When the external stuffing box 1 is detachably connected to the rear end 13 of the original stuffing box, the front end 101 of the external stuffing box 1 is correspondingly inserted into the rear end 13 of the original stuffing box, thereby playing the role of squeezing the stuffing; the plate surface of the annular positioning plate 8 abuts against the rear end 13 of the original stuffing box, and the positioning hole 9 corresponds to the hole position set at the rear end 13 of the original stuffing box one by one, and is fixed by 4*M12 bolts. The tail end 103 of the external stuffing box 1 is provided with a plurality of first threaded holes 10, the rear cover 2 includes a connecting portion 201 and a positioning portion 202, the positioning portion 202 of the rear cover 2 is provided with a plurality of second threaded holes 11, when the rear cover 2 is detachably connected to the external stuffing box 1, the connecting portion 201 of the rear cover 2 is inserted into the interior of the tail end 103 of the external stuffing box 1, the positioning portion 202 of the rear cover 2 abuts against the tail end 103 of the external stuffing box 1, and each first threaded hole 10 is correspondingly communicated with a second threaded hole 11, and bolts are sequentially penetrated through the second threaded holes 11 and the first threaded holes 10, and the rear cover 2 is detachably connected to the external stuffing box 1.

[0027] The central axis of the front end 101 of the external stuffing box 1, the central axis of the rear end 103 of the external stuffing box 1 and the central axis of the middle part 102 of the external stuffing box 1 coincide. Through the integrated design of the external stuffing box 1 and the positioning function of the annular positioning plate 8, the coaxial deviation between the device and the actuator of the equipment body is greatly reduced during installation, which can ensure.

[0028] Since a cavity for packing is provided inside the external packing box 1, the internal pressure is relatively high when the device is installed and in operation. The diameter of the front end 101 of the external packing box 1 and the diameter of the rear end 103 of the external packing box 1 are both smaller than the diameter of the middle part 102 of the external packing box 1, which is conducive to ensuring the wall thickness of the middle part 102 of the external packing box 1, so as to be more pressure-resistant. A sealing packing ring 5 and a spare packing ring 6 are provided on the inner wall of the external packing box 1. The sealing packing ring 5 and the spare packing ring 6 are both cavities with packing added. The spare packing ring 6 is located near the front end 101 in the internal cavity of the external packing box 1. The sealing packing ring 5 is located near the rear end 103 in the internal cavity of the external packing box 1. A packing spacer ring 7 for partitioning is provided between the sealing packing ring 5 and the spare packing ring 6. The packing spacer ring 7 is made of an annular metal material. The sealing packing ring 5 and the spare packing ring 6 are arranged in sequence so that a step-type series structure is formed on the inner wall of the external packing box 1. When packing, the packing is installed through the packing pressing sleeve, and the packing is pressed circle by circle; the static friction force of the packing is smaller than the thrust of the valve stem 12 of the cold wall sliding valve.

[0029] Part II: Feasibility Calculation of Cylinder Piston Force

[0030] The catalytic cracking cold wall slide valve packing leakage repair device designed by the present invention utilizes the original packing gland for bolt connection and fixation, and is positioned at the connecting partition between the actuator of the equipment body and the valve body. Through the feasibility calculation of the cylinder piston force, it can fully meet the working needs and achieve the long-term use of the catalytic slide valve.

[0031] The newly added packing needs to ensure that the sliding valve stem 12 can move freely under the force of the cylinder, ensure that there is no jamming, and ensure that the cylinder piston has sufficient axial force to overcome the friction of the newly installed packing, so as to meet the requirements of normal operation of the equipment after installation.

[0032] The calculation process includes the following:

[0033] Obtain the required basic parameters: cylinder diameter: D = 150mm; working state oil pump pressure: P min =6MPa, P max =10MPa;

[0034] The material of the packing is graphite, the material of the valve stem 12 is steel, and the friction coefficient μ between graphite and steel is 0.4; the pressure between the packing and the valve stem 12 comes from the positive pressure F brought by the bolt N According to the test results, F N Take 3.5*10 6 N.

[0035] The following calculation formula is obtained through force analysis:

[0036] Cylinder piston area: S = π*(D / 2) 2 =3.14*(0.15 / 2) 2 =0.18m 2 ;

[0037] Minimum thrust of valve stem 12: F 推 =P min / S=6*10 6 / 0.18=3.33*10 7 N;

[0038] Static friction of packing: F 摩 =μ*F N =0.4*3.5*10 6 =1.4*10 6 N;

[0039] Feasibility analysis: Because F 摩 <F 推 Therefore, the minimum thrust F of valve stem 12 推 (That is, the minimum force of the hydraulic control unit) can fully push the slide valve to work normally, indicating that this design is safe and controllable.

[0040] Part III: Example Application and Description

[0041] In petrochemical enterprises, the long-term operation of heavy oil catalysis has always been the direction of industry exploration, and the long-term safe use of cold wall slide valves is an important problem that restricts the long-term operation of catalytic devices. In production operations, since the current device automation control has reached 100%, the slide valve is in automatic control, the valve stem 12 and the packing there are always in low-frequency and small-stroke relative sliding, and cooling purge steam is injected at the seal.

[0042] PetroChina Jinxi Petrochemical Company 1.8×10 6 In the t / a heavy oil catalytic cracking unit, the semi-regenerative slide valve is installed on the inclined tube of the regenerator of the catalytic cracking unit to control the regenerator pressure to keep it consistent with the reactor pressure. The valve opening is adjusted automatically by the hydraulic control unit on the valve by sending a pneumatic signal through the pneumatic pressure difference regulator according to the pressure difference between the regenerator and the reactor. The main parameters of the semi-regenerative slide valve are shown in Table 1.

[0043] Table 1 Main parameters of semi-regenerative slide valve

[0044] Main parameters data Design pressure / MPa 0.6MPa Design pressure difference / MPa 0.15MPa Design temperature / ℃ 500-780℃ <![CDATA[Full opening area / m 2 > <![CDATA[0.18m 2 ]]> Valve full stroke / mm 540mm

[0045] Fault cause analysis: During the operation of the slide valve, 700℃ high-temperature flue gas entrained catalyst particles and leaked along the valve stem 12. The main reasons for the leakage are as follows:

[0046] ①The quality problem of the installation packing causes failure after work.

[0047] ② The cooling and purge steam of the valve stem 12 is too large, causing erosion and leakage of the valve stem 12.

[0048] ③ The valve body expands due to heat, which compresses the valve stem 12 so that it is not concentric with the stuffing box.

[0049] ④ The production process operation fluctuates too much, causing the valve stem 12 and packing to wear out.

[0050] When the original stuffing box of the sliding valve leaks, the 700℃ flue gas mixed with catalyst sprays at the stuffing part, which will cause a series of serious problems such as damage to the stuffing at the sealing part and blow damage to the valve stem 12 in a short time. In the past treatment measures, high-pressure glue guns were generally used to inject glue into the spare stuffing ring 6. For safety reasons, the working stuffing could not be replaced online, which resulted in the leakage not being solved immediately, causing emergency shutdowns and losses of over 10 million yuan.

[0051] In the past, on-site leak repair methods generally use external welding of stuffing boxes for repair. However, after this method is used, on the one hand, the installation accuracy cannot be guaranteed, and on the other hand, the welding point is deformed greatly, and the coaxiality deviation is large (even reaching the millimeter level), which causes great damage to the equipment body. The entire equipment still needs to be replaced within a short period after welding, which increases the cost of equipment repair. Because the leaked gas contains CO, and the on-site welding operation space is small, the operation risk is extremely high; after welding, the valve body and the external welding stuffing box are deformed, and the coaxiality cannot be guaranteed to be within a small error range.

[0052] The installation process of the external stuffing box 1 designed by the present invention is as follows: The heavy oil catalytic DYLD1000 semi-regeneration slide valve leakage is remedied by installing a new external stuffing box 1. The operation method is as follows: After the original stuffing box of the valve body completely fails, the new external stuffing box 1 is installed at the position of the connecting partition between the stuffing part of the slide valve and the transmission part. The external stuffing box 1 is installed on the original stuffing box body by using the original stuffing box gland fastening bolts, which does not require the staff to perform installation work in a small working space for a long time, which is conducive to ensuring the safety of the staff.

[0053] The external stuffing box 1 designed by the present invention is an integrated structure that fully fits the equipment, can be installed on site immediately, and is simple to install, does not require on-site welding, and is convenient to operate without the need for hot work. The troubleshooting time can be completed within 4 hours. Specifically, the front end 101 of the external stuffing box 1 of the device is positioned and connected through the positioning hole 9 on the annular positioning plate 8 using 4*M12 bolts, and the outer diameter of the rear pressure cover 2 connected to the tail end 103 of the external stuffing box 1 is matched with the inner hole of the positioning partition of the equipment body, so as to ensure that the coaxiality deviation between the external stuffing box 1 and the actuator of the equipment body is at a low level (Note: a lip seal is originally installed here, which can be removed, and the actuator of individual small sizes can be removed for turning). Once a valve stem 12 packing leakage accident occurs during the operation of the device, an external stuffing box 1 is installed safely, quickly and reliably, so that the fault can be quickly resolved and the long cycle of the equipment is guaranteed. The processing cost of the device is low, the material is easy to store, and it is recyclable, and 100% pre-stocked.

[0054] If each equipment is pre-installed after overhaul, the troubleshooting time can be shortened to 15 minutes, thus greatly avoiding the possibility that leakage of high-temperature flue gas mixed with catalyst will erode the valve stem 12, causing the leakage accident to be unable to be repaired in time. The installation of this device can avoid unplanned emergency shutdowns caused by failures. According to actual calculations, it can save 15 days of shutdown time per time, reduce costs by more than 10 million, and reduce the loss of oil slurry processing volume by 160-180T / h.

[0055] In the device described in the present application, the integrated external stuffing box 1 is the main design component, and the front end 101 of the component is designed in the form of the original stuffing box pressure cover (that is, when the external stuffing box 1 is detachably connected to the rear end 13 of the original stuffing box, the front end 101 of the external stuffing box 1 is correspondingly inserted into the rear end 13 of the original stuffing box, and the plate surface of the annular positioning plate 8 abuts against the rear end 13 of the original stuffing box), and is fastened with 4*M12 bolts; the tail end 103 cooperates with the transmission box partition (the transmission box partition is not shown in the accompanying drawings), and the integrated external stuffing box 1 is positioned and installed and the radial clearance is controlled to ensure that the coaxiality error between the external stuffing box 1 and the valve stem 12 after installation is less than 0.10mm. Through this design, you only need to remove the transmission box and the cylinder during installation, and position the tail after installation, which basically ensures the long-term use of the facility after installation.

[0056] The results of the application of the present invention are as follows: through reasonable design calculations, and improvements in the packing compression method, the external packing device installed by utilizing the original space of the slide valve has been safely operated for more than 36 months, and no leakage accident has occurred again. The slide valve stem 12 is sensitive to operate without jamming, proving that the design is successful, avoiding unplanned emergency shutdown of the heavy oil catalytic cracking unit, and ensuring the smooth completion of the company's annual production tasks. In the above-mentioned slide valve packing press-fitting process, the quality of the accessories is strictly inspected, unqualified products are never installed, and the external packing box 1 is appropriately reserved to ensure production needs and meet the requirements of long-term operation of the device.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Catalytic cracking cold wall slide valve packing leakage repair device, characterized in that: The invention comprises an external stuffing box (1) and a rear pressure cover (2), wherein the external stuffing box (1) is an integrated structure, a stuffing cavity is provided inside the external stuffing box (1), and the rear pressure cover (2) is detachably connected to the external stuffing box (1); when the external stuffing box (1) and the cold wall sliding valve device are installed, one end of the external stuffing box (1) is detachably connected to the rear end (13) of the original stuffing box, the other end of the external stuffing box (1) cooperates with the transmission box body partition, and the valve stem (12) of the cold wall sliding valve is inserted into the interior of the external stuffing box (1).

2. The catalytic cracking cold wall sliding valve packing leakage repair device according to claim 1, characterized in that: The external stuffing box (1) comprises a front end (101), a middle part (102) and a rear end (103) arranged in sequence, the central axis of the front end (101) of the external stuffing box (1), the central axis of the rear end (103) of the external stuffing box (1) and the central axis of the middle part (102) of the external stuffing box (1) coincide with each other, and the diameter of the front end (101) of the external stuffing box (1) and the diameter of the rear end (103) of the external stuffing box (1) are both smaller than the diameter of the middle part (102) of the external stuffing box (1); when the external stuffing box (1) is detachably connected to the rear end (13) of the original stuffing box, the front end (101) of the external stuffing box (1) is correspondingly inserted into the rear end (13) of the original stuffing box.

3. The catalytic cracking cold wall sliding valve packing leakage repair device according to claim 2, characterized in that: The outer wall of the front end (101) of the external stuffing box (1) is fixedly sleeved with an annular positioning plate (8) which is integrally formed with the front end (101) and protrudes outward, the central axis of the annular positioning plate (8) coincides with the central axis of the front end (101) of the external stuffing box (1), and a plurality of positioning holes (9) are arranged on the plate surface of the annular positioning plate (8), and the plurality of positioning holes (9) are arranged in an annular array with the central axis of the annular positioning plate (8) as the center; when the external stuffing box (1) is detachably connected to the rear end (13) of the original stuffing box, the plate surface of the annular positioning plate (8) abuts against the rear end (13) of the original stuffing box, and the positioning holes (9) correspond to and communicate with the hole positions of the rear end (13) of the original stuffing box, and are fixed by bolts.

4. The catalytic cracking cold wall slide valve packing leakage repair device according to claim 1, characterized in that: A sealing packing ring (5) and a spare packing ring (6) are provided on the inner wall of the external packing box (1); the sealing packing ring (5) and the spare packing ring (6) are both cavity structures with packing added thereto; a packing spacer ring (7) for performing a partitioning function is provided between the sealing packing ring (5) and the spare packing ring (6).

5. The catalytic cracking cold wall slide valve packing leakage repair device according to claim 4, characterized in that: The sealing packing ring (5), the packing spacer ring (7) and the spare packing ring (6) are arranged in sequence so that a step-type series structure is formed on the inner wall of the external packing box (1).

6. The catalytic cracking cold wall slide valve packing leakage repair device according to claim 4, characterized in that: The static friction force of the packing is smaller than the thrust force of the valve stem (12) of the cold wall sliding valve.

7. The catalytic cracking cold wall slide valve packing leakage repair device according to claim 2, characterized in that: The tail end (103) of the external stuffing box (1) is provided with a plurality of first threaded holes (10), and the rear cover (2) includes a connecting portion (201) and a positioning portion (202), and the positioning portion (202) of the rear cover (2) is provided with a plurality of second threaded holes (11). When the rear cover (2) is detachably connected to the external stuffing box (1), the connecting portion (201) of the rear cover (2) is inserted into the interior of the tail end (103) of the external stuffing box (1), and the positioning portion (202) of the rear cover (2) abuts against the tail end (103) of the external stuffing box (1), and each of the first threaded holes (10) is correspondingly connected to a second threaded hole (11), and bolts are sequentially inserted into the interior of the second threaded holes (11) and the first threaded holes (10), and the rear cover (2) is detachably connected to the external stuffing box (1).

8. The catalytic cracking cold wall slide valve packing leakage repair device according to claim 2, characterized in that: The inner side of the front end (101) of the external stuffing box (1) is provided with an oblique angle.

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