A method for repairing erosion and sealing of a fluidized bed reactor

Abstract

The invention belongs to the technical field of repairing erosion of the inner wall of a pressure vessel, and relates to a repairing method for erosion and sealing of an ebullating bed reactor, comprising: S1, determining a region to be repaired of the inner wall of the reactor; S2, repairing the region to be repaired by using an arc plate surfacing method; S3, removing the original sealing structure of the reactor; S4, resealing the reactor by using a multi-position plugging method of compression plugging; the invention repairs the position of the inner wall of the reactor damaged by erosion first, and then reseals the distribution plate and the inner wall of the reactor, thereby repairing the erosion and sealing of the reactor, restoring the inner wall of the reactor and the sealing structure of the reactor, ensuring that the reaction medium is evenly distributed in the reactor, promoting full contact and reaction between the raw material and hydrogen, thereby improving the utilization rate of the raw material and the product quality; at the same time, ensuring that after the sealing repair is completed, the inner wall of the reactor is no longer damaged by erosion, thereby ensuring the durability of the repair effect.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel inner wall erosion repair, and in particular to a method for repairing erosion and sealing of a fluidized bed reactor. Background Art

[0002] The ebullating bed hydro-upgrading reactor is a widely used equipment in the field of petrochemicals. It is mainly used for hydrocracking, hydro-refining and other processing processes of inferior raw materials such as heavy oil and residual oil to improve the utilization rate of raw materials and product quality. The ebullating bed hydro-upgrading reactor promotes full contact and reaction between raw materials and hydrogen by maintaining the boiling state of the catalyst, ensuring an efficient deep hydrogenation conversion process.

[0003] Regarding the structure of the fluidized bed hydrogenation reactor, first, a distribution plate is provided in the middle of the reactor. As a core component, the distribution plate is mainly responsible for evenly distributing the feed to various parts of the reactor; the gas-liquid distributor is located above the distribution plate, and the top nozzle of the gas-liquid distributor extends out of the upper surface of the distribution plate, responsible for evenly spraying the reaction medium to the catalyst bed above the distribution plate. Secondly, in order to prevent the leakage of the medium inside the reactor, a sealing gasket is provided between the lower surface of the distribution plate and the reactor wall to prevent the gas-liquid phase medium at the lower part of the distribution plate from leaking upward; in addition, in order to further enhance the sealing effect, a ceramic fiber rope is filled in the gap between the distribution plate and the wall to further prevent the leakage of the gas-liquid phase medium. In addition, a guide cone is provided on the upper surface of the distribution plate near one end of the wall, the bottom of the guide cone is tightly connected to the upper surface of the distribution plate, and the top gradually shrinks to a smaller opening, so that the reaction medium flows smoothly to the edge of the reactor along the conical surface of the guide cone after flowing through the distribution plate, avoiding the formation of vortices or dead corners above the distribution plate, thereby improving the uniformity of the distribution of the reaction medium in the catalyst bed.

[0004] However, in actual use, the sealing gasket between the lower surface of the distribution plate and the inner wall of the reactor fails, causing the medium in the lower part of the distribution plate to leak from the seal failure position. During the medium leakage process, the impact force of the leaking medium will cause the ceramic fiber rope between the distribution plate and the wall to rush out and fall off, and then cause the leaked medium to rush out in the axial and radial directions of the reactor, causing erosion and damage to the inner wall of the reactor within 200mm above the guide cone and the gas-liquid distributor on the upper surface of the distribution plate, resulting in uneven distribution of the medium in the reactor, and then resulting in insufficient contact between the raw material and hydrogen, thereby reducing the utilization rate of the raw material and the quality of the product. Summary of the invention

[0005] In view of the technical problem in the background technology that the sealing gasket between the lower surface of the distribution plate and the inner wall of the reactor fails, resulting in leakage of the medium at the lower part of the distribution plate, and the leaked medium causes erosion and damage to the inner wall of the reactor and the gas-liquid distributor, resulting in uneven distribution of the medium inside the reactor and reduced raw material utilization and product output, the present invention provides a method for repairing erosion and sealing of a fluidized bed reactor.

[0006] The method for repairing erosion and sealing of a fluidized bed reactor of the present invention repairs the damaged position of the reactor inner wall by erosion first, and then re-seals the distribution plate and the inner wall of the reactor to achieve the repair of the reactor erosion and sealing. After the repair is completed, the inner wall of the reactor and the sealing structure of the reactor are restored, ensuring that the reaction medium is evenly distributed in the reactor, promoting full contact and reaction between the raw material and hydrogen, thereby improving the utilization rate of the raw material and the product quality; at the same time, before performing the sealing repair, the damaged position of the reactor inner wall is repaired first, ensuring that after the sealing repair is completed, the reactor inner wall is no longer damaged by erosion, thereby improving the repair efficiency and ensuring the durability of the repair effect.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A method for repairing erosion and sealing of a fluidized bed reactor comprises the following steps:

[0009] S1, determining the area to be repaired on the inner wall of the reactor;

[0010] S2. Repair the area to be repaired by arc plate surfacing;

[0011] S3, dismantling the original sealing structure of the reactor;

[0012] S4. Reseal the reactor using a multi-position plugging method of compression and plugging to complete the repair of reactor erosion and sealing.

[0013] In a specific embodiment, the method used to determine the area to be repaired on the inner wall of the reactor is:

[0014] S1.1. Conduct 100% penetration testing on the scouring area of ​​the inner wall of the reactor and the area within 100mm around the scouring area. According to the standard of NB / T47013.5-2015, the test results are divided into Level I, Level II, Level III and Level IV; the area with the test result of Level I is determined as the qualified area, and the area with the test result of Level II, Level III and Level IV is determined as the area to be repaired;

[0015] S1.2. Areas with scour depth greater than 10 mm within the area to be repaired are judged as severely scour areas.

[0016] In a specific implementation scheme, the method of repairing the area to be repaired by arc plate surfacing is as follows:

[0017] S2.1. Hydrogen removal treatment: carry out hydrogen removal treatment on the area to be repaired;

[0018] S2.2. Filling the heavily scour area: Use high temperature resistant materials to fill the heavily scour area until the filling layer is flush with the original surface of the reactor inner wall, thus completing the filling of the heavily scour area;

[0019] S2.3, arc plate repair welding: weld the arc plate on the area to be repaired to complete the repair of the area to be repaired, wherein the thickness of the arc plate is M2, the wall thickness of the reactor is M1, and M2=(1 / 45~1 / 30)M1.

[0020] In a specific embodiment, the method of hydrogen removal treatment is:

[0021] The area to be repaired is subjected to constant temperature electric heating for 3 to 5 hours within the temperature range of 350°C to 400°C to complete the dehydrogenation treatment of the area to be repaired.

[0022] In a specific implementation scheme, the method of arc plate repair welding is:

[0023] The middle part of the arc plate is fully welded to the inner wall of the reactor, the height of the weld leg is L1, the width of the weld is L2, and L2 = (1-1.5) L1;

[0024] There are air-permeable gaps between the top and bottom of the arc plate and the inner wall of the reactor. The depth of the air-permeable gap is H1, and the width of the arc plate is H2, H1 = (1 / 10 to 1 / 5) H2.

[0025] In a specific embodiment, the method for removing the original sealing structure of the reactor is:

[0026] S3.1. Remove the ceramic fiber rope between the guide cone and the inner wall of the reactor;

[0027] S3.2, remove the diversion cone;

[0028] S3.3. Remove the ceramic fiber rope between the distribution plate and the inner wall of the reactor.

[0029] In a specific embodiment, the method of resealing the reactor by using a multi-position plugging method of compression plugging is:

[0030] S4.1. Sealing treatment between the distribution plate and the inner wall of the reactor:

[0031] S4.1.1. Fill the gap between the inner wall of the reactor and the distribution plate with ceramic fiber rope, the diameter of the ceramic fiber rope is R3, the gap between the distribution plate and the inner wall of the reactor is L3, R3 = (1 / 4 ~ 2 / 1) L3, and fill to the bottom installation position of the original guide cone;

[0032] S4.1.2. Install a sealing ring plate on the top of the ceramic fiber rope between the inner wall of the reactor and the distribution plate to complete the sealing process between the distribution plate and the inner wall of the reactor;

[0033] S4.2. Sealing treatment between the guide cone and the inner wall of the reactor:

[0034] S4.2.1. Install the guide cone onto the sealing ring plate;

[0035] S4.2.2, fill the gap between the guide cone and the inner wall of the reactor with a ceramic fiber rope having a diameter ranging from 18 mm to 22 mm;

[0036] S4.2.3. Use a clamping piece on the upper part of the guide cone to compact and seal the ceramic fiber rope between the guide cone and the inner wall of the reactor to complete the sealing process between the guide cone and the inner wall of the reactor.

[0037] In a specific embodiment, the method of installing a sealing ring plate on the top of the ceramic fiber rope between the inner wall of the reactor and the distribution plate comprises:

[0038] The inner circle of the sealing ring plate is intermittently welded to the distribution plate, and the outer circle of the sealing ring plate is fitted to the vessel wall.

[0039] In a specific implementation scheme, the thickness of the sealing ring plate ranges from 10 mm to 12 mm;

[0040] The inner diameter of the reactor at the sealing ring plate is R1, the ring width of the sealing ring plate is R2, the gap between the guide cone and the inner wall of the reactor is L4, R2 = (1 / 25 to 1 / 24) R1, R2 = (4 to 4.5) L4.

[0041] In a specific feasible implementation scheme, the clamping member includes a first clamping tube and a second clamping tube; the first clamping tube is welded to the top of the guide cone; the second clamping tube is located on the outer periphery of the first clamping tube, and the second clamping tube is welded to the first clamping tube; the diameters of the first clamping tube and the second clamping tube are both R4, R4=(1 / 4~1 / 3)L4.

[0042] In summary, the present invention has the following beneficial technical effects:

[0043] 1. The method for repairing erosion and sealing of an ebullating bed reactor of the present invention repairs the damaged position of the inner wall of the reactor by erosion first, and then re-seals the distribution plate and the inner wall of the reactor to achieve the repair of the erosion and sealing of the reactor. After the repair is completed, the inner wall of the reactor and the sealing structure of the reactor are restored, ensuring that the reaction medium is evenly distributed in the reactor, promoting full contact and reaction between the raw material and hydrogen, thereby improving the utilization rate of the raw material and the quality of the product; at the same time, before performing the sealing repair, the damaged position of the inner wall of the reactor is first repaired to ensure that after the sealing repair is completed, the inner wall of the reactor is no longer damaged by erosion, thereby improving the repair efficiency and ensuring the durability of the repair effect.

[0044] 2. The method for repairing erosion and sealing of an ebullating bed reactor of the present invention comprises the following steps: after removing the original sealing structure of the reactor, firstly, filling ceramic fiber ropes between the distribution plate and the inner wall of the reactor to form a first layer of sealing barrier; then, installing a sealing ring plate on the top of the ceramic fiber ropes between the distribution plate and the inner wall of the reactor to form a second layer of sealing barrier; then, filling ceramic fiber ropes between the guide cone and the inner wall of the reactor to form a third layer of sealing barrier; finally, using a pressing piece on the upper part of the guide cone to compact and seal the ceramic fiber ropes between the guide cone and the inner wall of the reactor to form a fourth layer of sealing barrier; arranging the ceramic fiber ropes, the sealing ring plate and the pressing piece to cooperate with each other, so that a multi-layer sealing protection barrier is formed inside the reactor, which greatly enhances the sealing effect, improves the sealing repair effect, and effectively prevents subsequent medium from leaking again. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a cross-sectional view of the ebullating bed reactor of the present invention.

[0046] Figure 2 yes Figure 1 A partial enlarged view is intended to illustrate the sealing structure of the fluidized bed reactor.

[0047] Figure 3 It is a top view of the ebullating bed reactor of the present invention.

[0048] Explanation of the reference numerals: 1. distribution plate; 2. sealing gasket; 3. guide cone; 4. ceramic fiber rope; 5. sealing ring plate; 6. boss; 7. pressing piece. DETAILED DESCRIPTION

[0049] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the implementation modes described below.

[0050] Reference Figure 1 to Figure 3In the present invention, the specification of the fluidized bed hydrogenation reactor is φ4300 / φ3200×(194+6.5) / (145+6.5)×60838mm, and the shell material is: main body 12Cr2Mo1V+surfacing layer TP.309+TP.347. The inner wall of the reactor is provided with a boss 6, and the distribution plate 1 is installed inside the reactor through the boss 6, and the boss stably supports the distribution plate 1. During actual use, the sealing gasket 2 between the lower surface of the distribution plate 1 and the inner wall of the reactor fails, causing the medium in the lower part of the distribution plate 1 to leak from the seal failure position. During the medium leakage process, the impact force of the leaking medium will cause the ceramic fiber rope 4 between the distribution plate 1 and the wall to rush out and fall off, thereby causing the leaked medium to rush out in the axial and radial directions of the reactor, causing erosion and damage to the inner wall of the reactor within 200 mm above the guide cone 3 and the gas-liquid distributor, resulting in uneven distribution of the medium inside the reactor, thereby resulting in insufficient contact between the raw material and hydrogen, and reducing the utilization rate of the raw material and the quality of the product.

[0051] The present invention aims to provide a method for repairing erosion and sealing of a fluidized bed reactor. The method first repairs the damaged position of the reactor inner wall by erosion, and then re-seals the distribution plate 1 and the inner wall of the reactor to achieve the repair of the erosion and sealing of the reactor. After the repair is completed, the inner wall of the reactor and the sealing structure of the reactor are restored, ensuring that the reaction medium is evenly distributed in the reactor, promoting full contact and reaction between the raw material and hydrogen, thereby improving the utilization rate of the raw material and the product quality; at the same time, before performing the sealing repair, the damaged position of the reactor inner wall is repaired first to ensure that after the sealing repair is completed, the inner wall of the reactor is no longer eroded and damaged, thereby improving the repair efficiency and ensuring the durability of the repair effect.

[0052] Example 1

[0053] Reference Figure 1 to Figure 3 , a method for repairing erosion and sealing of a fluidized bed reactor, comprising the following steps:

[0054] S1, determining the area to be repaired on the inner wall of the reactor;

[0055] S1.1. Conduct 100% penetration testing on the scouring area of ​​the inner wall of the reactor and the area within 100mm around the scouring area. According to the standard of NB / T47013.5-2015, the test results are divided into Level I, Level II, Level III and Level IV; the area with the test result of Level I is determined as the qualified area, and the area with the test result of Level II, Level III and Level IV is determined as the area to be repaired;

[0056] S1.2. Areas with scour depth greater than 10 mm within the area to be repaired are judged as severely scour areas.

[0057] S2. Repair the area to be repaired by arc plate surfacing.

[0058] S2.1. Hydrogen removal treatment: carry out hydrogen removal treatment on the area to be repaired;

[0059] The area to be repaired is subjected to constant temperature electric heating for 3 to 5 hours within the temperature range of 350°C to 400°C to complete the dehydrogenation treatment of the area to be repaired.

[0060] Specifically, the board area to be bonded is subjected to constant temperature electric heating at 380°C for 4 hours to remove hydrogen that may be generated during welding, prevent hydrogen from causing welding cracks, and ensure welding quality.

[0061] S2.2. Filling the heavily scour area: Use high temperature resistant materials to fill the heavily scour area until the filling layer is flush with the original surface of the reactor inner wall, thus completing the filling of the heavily scour area;

[0062] Specifically, the high temperature resistant material can be high temperature resistant cement, refractory bricks, ceramic fibers, etc. The high temperature resistant material can be used to fill the heavy scouring area, while ensuring that the high temperature resistant material has good high temperature resistance and scouring resistance. Preferably, the high temperature resistant material uses high temperature resistant cement, which is easy to construct and has high strength after curing.

[0063] S2.3, arc plate repair welding: weld the arc plate on the area to be repaired to complete the repair of the area to be repaired;

[0064] Among them, the curvature of the arc plate is consistent with the curvature of the inner diameter of the wall; the thickness of the arc plate is M2, the wall thickness of the reactor is M1, and M2 = (1 / 45 ~ 1 / 30) M1.

[0065] In the present invention, by setting a suitable arc plate thickness, it is ensured that the reactor has sufficient strength and stability when subjected to complex environments such as internal pressure, temperature fluctuations, and medium corrosion. Specifically, in this embodiment, the reactor wall thickness M1 is 151.5 mm, which is composed of a reactor inner wall with a thickness of 145 mm and a cladding layer with a thickness of 6.5 mm, and the arc plate thickness M2 is 4 mm; if the arc plate thickness is too large, the welding stress increases, which easily leads to welding deformation, and at the same time, increases the difficulty of arc plate processing; if the arc plate thickness is too small, it cannot provide sufficient strength to resist the scouring of the medium, reducing the repair effect.

[0066] More specifically, the arc plate is made of S32168, and the arc plate and the cladding layer on the inner wall of the reactor are both made of stainless steel, ensuring that the arc plate is only welded to the cladding layer, thereby avoiding affecting the main material of the reactor cylinder.

[0067] The middle part of the arc plate is fully welded to the inner wall of the reactor, the height of the weld foot is L1, the width of the weld is L2, and L2=(1-1.5)L1; air-permeable gaps are left between the top and bottom of the arc plate and the inner wall of the reactor, and the depth of the air-permeable gaps is H1, and the width of the arc plate is H2, and H1=(1 / 10-1 / 5)H2.

[0068] In the present invention, by setting a weld leg of appropriate height, the strength of the weld is improved, thereby improving the strength and stability of the reactor. Specifically, in this embodiment, the weld width L2 is 6 mm, and the weld leg height L1 is 4 mm; if the weld leg height is too large, the heat and stress generated during welding will cause the weld and the surrounding area of ​​the weld to deform, thereby affecting the internal structure of the reactor; if the weld leg height is too small, it is easy to reduce the strength of the weld, and it is easy to cause a medium leakage accident at the weld.

[0069] In the present invention, by setting a suitable depth of air gap, it is ensured that the gas generated during welding is discharged smoothly, the generation of welding defects is avoided, and the strength of the reactor is guaranteed. Specifically, in this embodiment, the width H2 of the arc plate is 200mm, the depth H1 of the air gap is 20mm, and the specific specifications of the arc plate are length * width * thickness = 400mm × 200mm × 4mm; if the depth of the air gap is too large, the welding difficulty is increased, and the density of the weld is reduced, affecting the strength and stability of the reactor; if the depth of the air gap is too small, the high temperature environment of the reactor during operation is easy to cause the gap to close, thereby hindering the discharge of gas, resulting in welding defects such as pores, slag inclusions, etc., and thus easily causing serious accidents such as leakage or explosion of the reactor during operation.

[0070] S3. Remove the original sealing structure of the reactor.

[0071] S3.1, remove the ceramic fiber rope 4 between the guide cone 3 and the inner wall of the reactor;

[0072] S3.2, dismantle the guide cone 3;

[0073] S3.3. Remove the ceramic fiber rope 4 between the distribution plate 1 and the inner wall of the reactor.

[0074] S4. Reseal the reactor using a multi-position plugging method of compression and plugging to complete the repair of reactor erosion and sealing.

[0075] S4.1. Sealing treatment between the distribution plate 1 and the inner wall of the reactor.

[0076] S4.1.1. Fill the gap between the inner wall of the reactor and the distribution plate 1 with a ceramic fiber rope 4, the diameter of which is R3. The gap between the distribution plate and the inner wall of the reactor is L3, where R3 = (1 / 4 to 2 / 1) L3. Fill the gap to the bottom installation position of the original guide cone 3.

[0077] In the present invention, by setting a ceramic fiber rope 4 of a suitable diameter, it is ensured that the ceramic fiber rope 4 is tightly filled in the gap between the inner wall of the reactor and the distribution plate 1 to form an effective seal. Specifically, in this embodiment, the gap L3 between the distribution plate and the inner wall of the reactor is 30 mm, and the diameter of the ceramic fiber rope 4 is 10 mm; if the diameter of the ceramic fiber rope 4 is too large, it cannot be smoothly filled into the gap between the inner wall of the reactor and the distribution plate 1, resulting in a loose seal; if the diameter of the ceramic fiber rope 4 is too small, it is easy to reduce the sealing effect due to loose filling.

[0078] S4.1.2. Install a sealing ring plate 5 on the top of the ceramic fiber rope 4 between the inner wall of the reactor and the distribution plate 1 to complete the sealing process between the distribution plate 1 and the inner wall of the reactor.

[0079] The inner circle of the sealing ring plate 5 is intermittently welded to the distribution plate 1, and the outer circle of the sealing ring plate 5 is in contact with the vessel wall; the thickness of the sealing ring plate 5 is in the range of 10 mm to 12 mm; the inner diameter of the reactor at the sealing ring plate 5 is R1, the ring width of the sealing ring plate 5 is R2, the gap between the guide cone and the inner wall of the reactor is L4, R2 = (1 / 25 to 1 / 24) R1, R2 = (4 to 4.5) L4.

[0080] In the present invention, by setting the sealing ring plate 5 with a suitable thickness, it is ensured that it is not easy to deform when subjected to the medium pressure, and a stable sealing effect is maintained. Such setting methods are all acceptable. Specifically, in this embodiment, the thickness of the sealing ring plate 5 is 10 mm; if the thickness of the sealing ring plate 5 is too large, the installation difficulty and manufacturing cost will be increased; if the thickness of the sealing ring plate 5 is too small, it cannot withstand the medium pressure, which is easy to cause deformation and sealing failure.

[0081] In the present invention, by setting a sealing ring plate 5 of appropriate width, it is ensured that the contact area between the sealing ring plate 5 and the inner wall of the reactor and the distribution plate is large enough to provide a reliable sealing effect. Specifically, in this embodiment, the inner diameter R1 of the reactor is 3200 mm, the gap L4 between the guide cone and the inner wall of the reactor is 30 mm, and the ring width R2 of the sealing ring plate 5 is 130 mm; if the ring width of the sealing ring plate 5 is too large, the material cost and processing difficulty will increase, and the welding workload will increase; if the ring width of the sealing ring plate 5 is too small, the sealing effect will be easily reduced due to insufficient contact area.

[0082] S4.2. Sealing treatment between the guide cone 3 and the inner wall of the reactor.

[0083] S4.2.1. Install the guide cone 3 onto the sealing ring plate 5;

[0084] S4.2.2, filling the gap between the guide cone 3 and the inner wall of the reactor with a ceramic fiber rope 4;

[0085] S4.2.3. Use the pressing piece 7 on the upper part of the guide cone 3 to compact and seal the ceramic fiber rope 4 between the guide cone 3 and the inner wall of the reactor, so as to complete the sealing process between the guide cone 3 and the inner wall of the reactor.

[0086] The compression member 7 includes a first compression tube and a second compression tube. The first compression tube is welded to the top of the guide cone 3; the second compression tube is located at the outer periphery of the first compression tube, and the second compression tube is welded to the first compression tube.

[0087] The diameters of the first compression tube and the second compression tube are both R4, R4=(1 / 4-1 / 3)L4.

[0088] In the present invention, by setting a first compression tube and a second compression tube of appropriate diameter, the ceramic fiber rope 4 between the flow guide cone 3 and the vessel wall is further compressed and sealed to prevent the ceramic fiber rope 4 from rushing out and falling off. Specifically, in this embodiment, the diameters of the first compression tube and the second compression tube are both 10 mm; if the diameters of the first compression tube and the second compression tube are too large, the material cost and processing difficulty are increased, and the welding stress is increased; if the diameters of the first compression tube and the second compression tube are too small, the ceramic fiber rope 4 between the flow guide cone 3 and the vessel wall may not be compressed and sealed, resulting in the ceramic fiber rope 4 rushing out and falling off, reducing the sealing effect of the reactor.

[0089] The preferred embodiments of the present invention are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for repairing erosion and sealing of a fluidized bed reactor, characterized in that: The following steps are involved: S1, determining the area to be repaired on the inner wall of the reactor; S2. Repair the area to be repaired by arc plate surfacing; S3, dismantling the original sealing structure of the reactor; S4. Reseal the reactor using a multi-position plugging method of compression and plugging to complete the repair of reactor erosion and sealing.

2. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 1, characterized in that: The method used to determine the area to be repaired on the inner wall of the reactor is: S1.

1. Conduct 100% penetration testing on the scouring area of ​​the inner wall of the reactor and the area within 100mm around the scouring area. According to the standard of NB / T47013.5-2015, the test results are divided into Level I, Level II, Level III and Level IV; the area with the test result of Level I is determined as the qualified area, and the area with the test result of Level II, Level III and Level IV is determined as the area to be repaired; S1.

2. Areas with scour depth greater than 10 mm within the area to be repaired are judged as severely scour areas.

3. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 2, characterized in that: The method of repairing the area to be repaired by arc plate surfacing is: S2.

1. Hydrogen removal treatment: carry out hydrogen removal treatment on the area to be repaired; S2.

2. Filling the heavily scour area: Use high temperature resistant materials to fill the heavily scour area until the filling layer is flush with the original surface of the reactor inner wall, thus completing the filling of the heavily scour area; S2.3, arc plate repair welding: weld the arc plate on the area to be repaired to complete the repair of the area to be repaired, wherein the thickness of the arc plate is M2, the wall thickness of the reactor is M1, and M2=(1 / 45~1 / 30)M1.

4. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 3, characterized in that: The method of hydrogen removal treatment is: The area to be repaired is subjected to constant temperature electric heating for 3 to 5 hours within the temperature range of 350°C to 400°C to complete the dehydrogenation treatment of the area to be repaired.

5. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 3, characterized in that: The method of arc plate repair welding is: The middle part of the arc plate is fully welded to the inner wall of the reactor, the height of the weld leg is L1, the width of the weld is L2, and L2 = (1-1.5) L1; There are air-permeable gaps between the top and bottom of the arc plate and the inner wall of the reactor. The depth of the air-permeable gap is H1, and the width of the arc plate is H2, H1 = (1 / 10 to 1 / 5) H2.

6. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 1, characterized in that: The method for removing the original sealing structure of the reactor is: S3.

1. Remove the ceramic fiber rope (4) between the guide cone (3) and the inner wall of the reactor; S3.2, remove the guide cone (3); S3.

3. Remove the ceramic fiber rope (4) between the distribution plate (1) and the inner wall of the reactor.

7. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 6, characterized in that: The method for resealing the reactor by using a multi-position plugging method of compression plugging is: S4.

1. Sealing treatment between the distribution plate (1) and the inner wall of the reactor: S4.1.

1. Fill the gap between the inner wall of the reactor and the distribution plate (1) with a ceramic fiber rope (4), the diameter of the ceramic fiber rope (4) being R3, the gap between the distribution plate (1) and the inner wall of the reactor being L3, R3 = (1 / 4 to 2 / 1) L3, and fill the gap to the bottom installation position of the original guide cone (3); S4.1.

2. Install a sealing ring plate (5) on the top of the ceramic fiber rope (4) between the inner wall of the reactor and the distribution plate (1) to complete the sealing process between the distribution plate (1) and the inner wall of the reactor; S4.

2. Sealing treatment between the guide cone (3) and the inner wall of the reactor: S4.2.

1. Install the guide cone (3) onto the sealing ring plate (5); S4.2.2, filling the gap between the guide cone (3) and the inner wall of the reactor with a ceramic fiber rope (4); S4.2.

3. Use a clamping piece (7) on the upper part of the guide cone (3) to compact and seal the ceramic fiber rope (4) between the guide cone (3) and the inner wall of the reactor, thereby completing the sealing process between the guide cone (3) and the inner wall of the reactor.

8. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 7, characterized in that: The method for installing a sealing ring plate (5) on the top of a ceramic fiber rope (4) between an inner wall of a reactor and a distribution plate (1) comprises: The inner ring of the sealing ring plate (5) is intermittently welded to the distribution plate (1), and the outer ring of the sealing ring plate (5) is fitted to the wall of the container.

9. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 8, characterized in that: The thickness of the sealing ring plate (5) is in the range of 10 mm to 12 mm; The inner diameter of the reactor at the sealing ring plate (5) is R1, the ring width of the sealing ring plate (5) is R2, the gap between the guide cone and the inner wall of the reactor is L4, R2 = (1 / 25 to 1 / 24) R1, R2 = (4 to 4.5) L4.

10. The method for repairing erosion and sealing of an ebullated bed reactor according to claim 7, characterized in that: The pressing member (7) comprises a first pressing tube and a second pressing tube; The first compression tube is welded to the top of the guide cone (3); The second compression tube is located at the outer periphery of the first compression tube, and the second compression tube is welded to the first compression tube; The diameters of the first compression tube and the second compression tube are both R4, where R4=(1 / 4-1 / 3)L4.

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