Horizontal Installation Method of the Distribution Tray of the Fluidized-Bed Residuum Hydrotreating Reactor

Abstract

The present invention provides a horizontal installation method for the distributor plate of a ebullated bed residue hydrotreating reactor, which can reduce the difficulty of assembling and welding the distributor plate and shorten the assembly time, and relates to the installation method of the distributor plate of the ebullated bed residue hydrotreating reactor. The horizontal installation method for the distributor plate of the ebullated bed residue hydrotreating reactor includes manufacturing the distributor plate and the conical connecting cylinder; assembling the manufactured conical connecting cylinder with the distributor plate and welding the circumferential weld between the conical connecting cylinder and the distributor plate to form an assembled component of the distributor plate to be assembled; horizontally placing the lower shell of the reactor and feeding the processed assembled component of the distributor plate to be assembled into the lower shell of the reactor; welding the circumferential weld between the conical connecting cylinder of the assembled component of the distributor plate to be assembled and the base of the support boss, and simultaneously surfacing the remaining part of the support boss on the base of the support boss to complete the assembly construction of the distributor plate. This method can improve the assembly efficiency and assembly quality, and the process is also simplified.

Description

Technical Field

[0001] The present invention relates to an installation method for a distribution tray of a ebullated bed residue hydrotreating reactor, and particularly to a horizontal installation method for a distribution tray of an ebullated bed residue hydrotreating reactor. Background Art

[0002] The ebullated bed residue hydrotreating reactor is an important equipment in the petroleum refining process, which can increase the residue conversion rate from the original 40 - 50% to 85%, further increasing the output of light fuel oil. The internals of this reactor are not allowed to participate in post-weld heat treatment. Due to its complex structure, the assembly of the reactor internals has become a difficult point in equipment manufacturing, especially the assembly of the distribution tray with a large weight at the lower part of the reactor.

[0003] Chinese Patent with application number 201710113301.9 discloses a vertical installation method for a distribution tray of an ebullated bed residue hydrotreating reactor. In this method, the lower shell of the reactor is placed vertically first, then the distribution tray and the conical connecting cylinder are respectively installed into the lower shell of the reactor and spot-welded in place, and finally the lower shell of the reactor is flipped to the horizontal state for welding of the distribution tray and the conical connecting cylinder. In order to facilitate the installation of the conical connecting cylinder into the lower shell of the reactor, that is, to facilitate the conical connecting cylinder to pass through the support boss inside the lower shell of the reactor, the conical connecting cylinder is installed in a split and then assembled manner. Therefore, this method requires welding of multiple longitudinal seams of the conical connecting cylinder inside the lower shell, one circumferential weld between the conical connecting cylinder and the distribution tray, and one circumferential weld between the conical connecting cylinder and the support boss. Limited by the operating space after assembly, the welding of the above-mentioned welds is relatively inconvenient, the assembly time required for the distribution tray is relatively long, which cannot meet the requirements of the current fast-paced production, and the welding flaw detection is relatively difficult. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a horizontal installation method for a distribution tray of an ebullated bed residue hydrotreating reactor, which can reduce the difficulty of assembly welding of the distribution tray and shorten the assembly time.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a horizontal installation method for a distribution tray of an ebullated bed residue hydrotreating reactor, including the following steps:

[0006] Manufacture the distribution tray and the conical connecting cylinder;

[0007] Assemble the manufactured conical connecting cylinder and the distribution tray together, and weld the circumferential weld between the conical connecting cylinder and the distribution tray to form an assembly component to be assembled for the distribution tray;

[0008] According to the theoretical maximum diameter D after the assembly of the conical connecting cylinder, process the assembly component to be assembled for the distribution tray so that the actual maximum diameter d of the conical connecting cylinder on the assembly component to be assembled for the distribution tray is consistent with the theoretical maximum diameter D;

[0009] Perform surfacing construction at the position of the support boss inside the lower section of the reactor shell to form the base of the support boss, and process the base of the support boss so that its inner diameter is greater than the actual maximum diameter d of the tapered connecting cylinder;

[0010] Set the distribution plate positioning block inside the lower section of the reactor shell according to the theoretical position after the distribution plate assembly is completed;

[0011] Place the lower section of the reactor shell horizontally, and send the processed distribution plate assembly to be assembled into the lower section of the reactor shell, so that it passes through the base of the support boss until its distribution plate fits with the distribution plate positioning block;

[0012] Measure the gap between the tapered connecting cylinder of the distribution plate assembly to be assembled and the base of the support boss. If the gap is uniform, temporarily fix the distribution plate assembly to be assembled. If the gap is not uniform, adjust the position of the distribution plate assembly to be assembled until the gap is uniform, and then temporarily fix the distribution plate assembly to be assembled;

[0013] Weld the circumferential weld between the tapered connecting cylinder of the distribution plate assembly to be assembled and the base of the support boss, and at the same time perform surfacing on the remaining part of the support boss on the base of the support boss to complete the distribution plate assembly construction.

[0014] Further, sending the processed distribution plate assembly to be assembled into the lower section of the reactor shell includes:

[0015] Set the distribution plate assembly to be assembled on one end of the lifting beam, set a counterweight at the other end of the lifting beam to ensure the balance of both ends of the lifting beam, use the lifting equipment to horizontally lift the lifting beam, and horizontally move it into the lower section of the reactor shell, so that the lifting beam with the distribution plate assembly to be assembled extends into the lower section of the reactor shell, thereby sending the distribution plate assembly to be assembled into the lower section of the reactor shell.

[0016] Further, there are two sets of the lifting equipment. When lifting, the center of gravity of the lifting beam is located between the lifting points of the two sets of lifting equipment. After removing the distribution plate assembly to be assembled, the center of gravity of the lifting beam is still located between the lifting points of the two sets of lifting equipment.

[0017] Further, temporarily fixing the distribution plate assembly to be assembled is through the stay ropes arranged inside the distribution plate assembly to be assembled.

[0018] Further, the inner diameter of the base of the support boss is A, and A = d + 4mm.

[0019] Further, it also includes steps of grinding the welds on the distribution plate assembly to be assembled and performing penetrant testing or magnetic particle testing.

[0020] Further, it also includes the steps of grinding the circumferential weld between the conical connecting cylinder and the base of the supporting boss to be flat and performing penetrant testing or magnetic particle testing.

[0021] Further, machining the to-be-assembled component of the distribution plate to make the actual maximum diameter d of the conical connecting cylinder on the to-be-assembled component of the distribution plate consistent with the theoretical maximum diameter D, and machining the base of the supporting boss to make its inner diameter greater than the actual maximum diameter d of the conical connecting cylinder are both completed by a lathe.

[0022] The beneficial effects of the present invention are as follows: In the installation method of the present invention, the distribution plate and the conical connecting cylinder are first assembled to form the to-be-assembled component of the distribution plate, and then a supporting boss base with an inner diameter greater than the actual maximum diameter d of the conical connecting cylinder is formed by surfacing, that is, a part of the supporting boss. Then, the to-be-assembled component of the distribution plate is sent into the lower shell of the reactor in a horizontal state, and welding positioning is achieved by cooperating with the distribution plate positioning block. Finally, the circumferential weld between the conical connecting cylinder and the base of the supporting boss is welded and the remaining part of the supporting boss is surfaced to assemble the distribution plate. This is convenient for the to-be-assembled component of the distribution plate to enter the shell. During the assembly process, only the circumferential weld between the conical connecting cylinder and the base of the supporting boss needs to be welded inside the reactor shell, while the other welds, such as the circumferential weld between the conical connecting cylinder and the distribution plate and the splicing weld of the conical connecting cylinder itself, are carried out outside the shell. The welding of the other welds is not restricted by the reactor shell, the construction is more convenient and easier, and it can be carried out in advance, and the quality is also easier to guarantee. Therefore, this method can improve the assembly efficiency and assembly quality, and the process is also simplified. Description of the Drawings

[0023] Figure 1 is the structural diagram of the to-be-assembled component of the distribution plate;

[0024] Figure 2 is the schematic diagram of the setting of the base of the supporting boss and the distribution plate positioning block;

[0025] Figure 3 is the hoisting schematic diagram of the to-be-assembled component of the distribution plate;

[0026] Figure 4 is the schematic diagram of the temporary fixation of the to-be-assembled component of the distribution plate;

[0027] As shown in the figure: the lower shell of the reactor 1, the to-be-assembled component of the distribution plate 2, the lifting beam 3, the lifting equipment 4, the counterweight 5, the base of the supporting boss 11, the distribution plate positioning block 12, the pull rope 13, the distribution plate 21, the conical connecting cylinder 22, the circumferential weld 23. Detailed Embodiments

[0028] The present invention will be further described below with reference to the drawings and embodiments.

[0029] As Figures 1 to 4As shown in the figure, the horizontal installation method of the distribution plate of the ebullated bed residue hydrotreating reactor of the present invention includes the following steps:

[0030] Step 1: Fabricate the distribution plate 21 and the conical connecting cylinder 22 according to production requirements.

[0031] Step 2: Assemble the fabricated conical connecting cylinder 22 with the distribution plate 21, and weld the circumferential weld 23 between the conical connecting cylinder and the distribution plate to form the distribution plate to-be-assembled component 2 (see Figure 1 ).

[0032] Step 3: Machine the distribution plate to-be-assembled component 2 according to the theoretical maximum diameter D after the assembly of the conical connecting cylinder 22, so that the actual maximum diameter d of the conical connecting cylinder 22 on the distribution plate to-be-assembled component 2 is consistent with the theoretical maximum diameter D.

[0033] Step 4: Carry out surfacing construction at the support boss position in the lower reactor shell 1 to form the support boss base 11, and machine the support boss base 11 so that its inner diameter is greater than the actual maximum diameter d of the conical connecting cylinder 22.

[0034] Step 5: Set the distribution plate positioning block 12 in the lower reactor shell 1 according to the theoretical position after the completion of the assembly of the distribution plate 21 (see Figure 2 ).

[0035] Step 6: Horizontally place the lower reactor shell 1, and send the machined distribution plate to-be-assembled component 2 into the lower reactor shell 1, so that it passes through the support boss base 11 until its distribution plate 21 cooperates with the distribution plate positioning block 12.

[0036] Step 7: Measure the gap between the conical connecting cylinder 22 of the distribution plate to-be-assembled component 2 and the support boss base 11. If the gap is uniform and meets the requirements, temporarily fix the distribution plate to-be-assembled component 2. If the gap is not uniform, adjust the position of the distribution plate to-be-assembled component 2 until the gap is uniform and meets the requirements, and then temporarily fix the distribution plate to-be-assembled component 2.

[0037] Step 8: Weld the circumferential weld 23 between the conical connecting cylinder 22 of the distribution plate to-be-assembled component 2 and the support boss base 11, and at the same time carry out surfacing on the remaining part of the support boss on the support boss base 22, thereby completing the distribution plate assembly construction.

[0038] The inner diameter of the support boss base 11 is A. The larger A is, the more convenient it is for the distribution plate to-be-assembled component to pass through, but if it is too large, it is not convenient for welding connection with the conical connecting cylinder 22. In order to facilitate the welding connection with the conical connecting cylinder 22 and the passage of the distribution plate to-be-assembled component, A = d + 4 mm, where d is the actual maximum diameter of the conical connecting cylinder 22.

[0039] The above-mentioned processing of the to-be-assembled component 2 of the distribution plate is carried out to make the actual maximum diameter d of the conical connecting cylinder 22 on the to-be-assembled component 2 of the distribution plate consistent with the theoretical maximum diameter D, and the base 11 of the supporting boss is processed so that its inner diameter is greater than the actual maximum diameter d of the conical connecting cylinder 22, which is generally completed by a large lathe.

[0040] The installation method of the present invention is to first assemble the distribution plate 21 and the conical connecting cylinder 22 to form the to-be-assembled component 2 of the distribution plate, then surfacing to form the base 11 of the supporting boss with an inner diameter greater than the actual maximum diameter d of the conical connecting cylinder 22, that is, a part of the supporting boss. Then, the to-be-assembled component 2 of the distribution plate is sent into the lower shell 1 of the reactor in a horizontal state, and the welding positioning is realized by cooperating with the distribution plate positioning block 12. Finally, the circumferential weld 23 between the conical connecting cylinder 22 and the base 11 of the supporting boss is welded and the remaining part of the supporting boss is surfaced to assemble the distribution plate. During the assembly process, only the circumferential weld 23 between the conical connecting cylinder 22 and the base 11 of the supporting boss needs to be welded inside the reactor shell, while the remaining welds, such as the circumferential weld 23 between the conical connecting cylinder and the distribution plate and the splicing weld of the conical connecting cylinder itself, are carried out outside the shell. The welding of the remaining welds is not restricted by the reactor shell, the welding construction is more convenient, and it can be carried out in advance, and the quality is easier to guarantee. Therefore, this method can improve the assembly efficiency and assembly quality. The supporting boss is surfaced in two times, that is, first the base 11 of the supporting boss is surfaced, and then the remaining part of the supporting boss is surfaced after the to-be-assembled component 2 of the distribution plate is welded and enters the shell, which not only ensures the smooth passing of the to-be-assembled component of the distribution plate, but also facilitates the flaw detection of the connecting weld between the conical connecting cylinder and the supporting boss in the distribution plate component. Through comparison, it is found that compared with the existing vertical installation method, the assembly time of the distribution plate of the method of the present invention is reduced from the original three days to one day, and the welding time is reduced from the original four days to two days, greatly improving the production efficiency.

[0041] The to-be-assembled component 2 of the distribution plate can be sent into the lower shell 1 of the reactor by setting a conveying device in the lower shell 1 of the reactor, but this not only easily damages the lower shell of the reactor, but also is time-consuming and laborious. In order to conveniently send the to-be-assembled component 2 of the distribution plate into the lower shell 1 of the reactor and not easily damage the lower shell 1 of the reactor, as shown in Figure 3, in the embodiment of the present invention, the processed to-be-assembled component 2 of the distribution plate is sent into the lower shell 1 of the reactor in the following manner:

[0042] Set and fix 2 sets of the to-be-assembled distributor plate components on one end of the lifting beam 3, and set counterweight blocks 5 at the other end of the lifting beam 3 to ensure the balance of both ends of the lifting beam 3. Use the lifting equipment 4 to horizontally lift the lifting beam 3 and horizontally move it into the lower shell 1 of the reactor, so that the lifting beam 3 with the to-be-assembled distributor plate components 2 extends into the lower shell 1 of the reactor, thereby sending the to-be-assembled distributor plate components 2 into the lower shell 1 of the reactor.

[0043] There can be one lifting equipment 4. In the present invention, there are two lifting equipments 4. During lifting, the center of gravity of the lifting beam 3 is located between the lifting points of the two lifting equipments 4. After removing the to-be-assembled distributor plate components 2, the center of gravity of the lifting beam 3 is still located between the lifting points of the two lifting equipments 4. In this way, after removing the to-be-assembled distributor plate components 2, the lifting beam 3 can still maintain balance, which is convenient for moving the lifting beam out of the lower shell 1 of the reactor.

[0044] As Figure 4 shown, specifically, in order to prevent the to-be-assembled distributor plate components 2 from tipping over, in the present invention, the to-be-assembled distributor plate components 2 are temporarily fixed by a stay rope 13 arranged inside the to-be-assembled distributor plate components 2, and the stay rope 13 tightens and fixes the to-be-assembled distributor plate components 2 on the distributor plate positioning block 12.

[0045] After assembling the conical connecting cylinder 22 with the distributor plate 21 in the present invention, there are also steps of grinding the welds on the to-be-assembled distributor plate components 2 and performing penetrant testing and radiographic testing. After welding the conical connecting cylinder 22 with the support boss base 11, there are also steps of grinding the circumferential weld 23 between the conical connecting cylinder 22 and the support boss base 11 flat and performing penetrant testing and radiographic testing to detect the welding effect and ensure the assembly device.

Claims

1. Horizontal installation method of the distribution tray of the ebullated bed residue hydrotreating reactor, characterized in that, It includes the following steps: Fabricate the distribution plate (21) and the conical connecting cylinder (22); Assemble the fabricated conical connecting cylinder (22) with the distribution plate (21), and weld the circumferential weld (23) between the conical connecting cylinder and the distribution plate, thereby forming the distribution plate to-be-assembled component (2); According to the theoretical maximum diameter D after the assembly of the conical connecting cylinder (22), process the distribution plate to-be-assembled component (2) so that the actual maximum diameter d of the conical connecting cylinder (22) on the distribution plate to-be-assembled component (2) is consistent with the theoretical maximum diameter D; Carry out surfacing construction at the position of the support boss in the lower reactor shell (1) to form the support boss base (11), and process the support boss base (11) so that its inner diameter is greater than the actual maximum diameter d of the conical connecting cylinder (22); According to the theoretical position after the completion of the assembly of the distribution plate (21), set the distribution plate positioning block (12) in the lower reactor shell (1); Place the lower reactor shell (1) horizontally, and send the processed distribution plate to-be-assembled component (2) into the lower reactor shell (1) so that it passes through the support boss base (11) until its distribution plate (21) cooperates with the distribution plate positioning block (12); Measure the gap between the conical connecting cylinder (22) of the distribution plate to-be-assembled component (2) and the support boss base (11). If the gap is uniform, temporarily fix the distribution plate to-be-assembled component (2). If the gap is not uniform, adjust the position of the distribution plate to-be-assembled component (2) until the gap is uniform, and then temporarily fix the distribution plate to-be-assembled component (2); Weld the circumferential weld (23) between the conical connecting cylinder (22) of the distribution plate to-be-assembled component (2) and the support boss base (11), and at the same time carry out surfacing on the remaining part of the support boss on the support boss base (11) to complete the distribution plate assembly construction; Among them, sending the processed distribution plate to-be-assembled component (2) into the lower reactor shell (1) includes: Sheath and fix the distribution plate to-be-assembled component (2) at one end of the lifting beam (3), set a counterweight block (5) at the other end of the lifting beam (3) to ensure the balance of both ends of the lifting beam (3), use the lifting equipment (4) to horizontally lift the lifting beam (3), and horizontally move it into the lower reactor shell (1) so that the lifting beam (3) with the distribution plate to-be-assembled component (2) installed extends into the lower reactor shell (1), thereby sending the distribution plate to-be-assembled component (2) into the lower reactor shell (1); There are two sets of the lifting equipment (4). During lifting, the center of gravity of the lifting beam (3) is located between the lifting points of the two sets of the lifting equipment (4). After removing the distribution plate to-be-assembled component (2), the center of gravity of the lifting beam (3) is still located between the lifting points of the two sets of the lifting equipment (4).

2. The horizontal installation method of the distribution tray of the ebullated bed residue hydrotreating reactor according to claim 1, characterized in that Temporarily fixing the distribution plate to-be-assembled component (2) is through the stay rope (13) arranged inside the distribution plate to-be-assembled component (2).

3. The horizontal installation method of the distribution tray of the ebullated bed residue hydrotreating reactor according to claim 1, characterized in that The inner diameter of the support boss base (11) is A, and A = d + 4mm.

4. The horizontal installation method of the distribution tray of the ebullated bed residue hydrotreating reactor according to claim 1, characterized in that, It also includes steps of grinding the welds on the distribution plate to-be-assembled component (2) and performing penetrant testing and radiographic testing.

5. The horizontal installation method of the distribution tray of the ebullated bed residue hydrotreating reactor according to claim 1, characterized in that, It also includes the steps of grinding the circumferential weld (23) between the conical connecting cylinder (22) and the support boss base (11) to be flat and performing penetrant testing and radiographic testing.

6. The horizontal installation method of the distribution tray of the ebullated bed residue hydrotreating reactor as described in claim 1, characterized in that, Processing the to-be-assembled component (2) of the distribution plate to make the actual maximum diameter d of the conical connecting cylinder (22) on the to-be-assembled component (2) of the distribution plate consistent with the theoretical maximum diameter D, and processing the support boss base (11) to have an inner diameter larger than the actual maximum diameter d of the conical connecting cylinder (22) are both completed by a lathe.

Images