Method for installing a pp closed loop tubular reactor
Patent Information
- Application Number
- CN202610697367.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-20
- Publication Date
- 2026-08-18
AI Technical Summary
PP闭合循环管式反应器体积庞大、结构复杂，其安装就位通常有两种方法:第一种是在地面完成组装配对后进行整体式吊装，这种安装就位方式对于吊装器械和吊装位置要求较高，施工难度较大，容易返工；第二种是采用分片吊装、空中组对方式
本发明所述的PP闭合循环管式反应器安装施工方法，在特制的组装平台上，完成反应器筒体、连接梁、部分钢结构平台的拼装与紧固，并为后期斜梯安装预设固定脚手架，利用特制工装进行反应器的底部连接管以及底部弯管的安装，从而极大减少了高空作业量，不仅提高了作业安全性，还有效提高了工作效率。
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Figure CN122589211A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for installing a PP closed-loop tubular reactor, belonging to the technical field of PP closed-loop tubular reactor installation. Background Technology
[0002] The PP closed-loop tubular reactor is a core piece of equipment for efficient polymerization reactions in modern chemical production, boasting advantages such as high capacity, low energy consumption, and stable product quality. Its structure mainly consists of components such as a cylindrical body, elbows, bends, connecting pipes, connecting beams, and external beams. Due to its large size and complex structure, the PP closed-loop tubular reactor is typically installed using two methods: the first is a complete assembly and pairing on the ground followed by overall hoisting. This method requires high-precision hoisting equipment and precise positioning, making construction more difficult and prone to rework. The second method involves segmented hoisting and aerial assembly. This method involves longer working times at height, has a lower safety factor, and a longer construction period. Summary of the Invention
[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a method for installing a PP closed-loop tubular reactor with low construction difficulty and high construction safety.
[0004] The installation and construction method of the PP closed-loop tubular reactor (hereinafter referred to as the reactor) described in this invention mainly includes the following steps: S1. Clarify the site layout and determine the minimum ground bearing capacity at the crane lifting station based on the crane foundation stability verification calculation sheet; S2. Based on the engineering geological survey report, combined with the crane's requirements for ground bearing capacity, and taking into account the on-site hydrogeological conditions, the area requiring foundation treatment was marked out on-site and hardened. S3. The bearing capacity of the hardened foundation is tested using the weight method to ensure that the bearing capacity of the foundation meets the hoisting requirements. S4, multiple assembly platforms are made according to the length of the reactor's cylindrical section; S5. Mark the lines on the hardened foundation to determine the placement of each assembly platform. Then use a crane to lift and place the assembly platforms and use shims for initial leveling. After all the assembly platforms are in place, use a level to perform final leveling. S6. The fourth, fifth, and sixth cylinders are hoisted and placed on the assembly platform using lifting equipment, and the fourth, fifth, and sixth cylinders are temporarily limited by limiting components to prevent radial slippage. S7. Use lifting equipment to make slight orientation adjustments to the fourth, fifth, and sixth cylinders so that the flanges on the fourth and sixth cylinders correspond to the axes of the two flanges on the fifth cylinder. Then use lifting equipment to hoist the first and second connecting pipes to the appropriate positions, and install the first connecting pipe between the fourth and fifth cylinders and the second connecting pipe between the fifth and sixth cylinders. S8, based on the actual height on site, erect the first layer of scaffolding on both sides of the fourth, fifth and sixth cylinders; S9, the first connecting bend is hoisted to the appropriate position using lifting equipment and installed between the fifth and sixth cylinders; at the same time, multiple first connecting beams are installed between the fourth and fifth cylinders and between the fifth and sixth cylinders. S10, multiple second connecting beams are installed on the fourth, fifth and sixth cylinders; S11, erect a second layer of scaffolding on the basis of the first layer of scaffolding; S12, using lifting equipment to hoist the third cylinder, the second cylinder and the first cylinder onto their respective second connecting beams; S13, use lifting equipment to lift the third connecting pipe and the fourth connecting pipe to the appropriate position, and install the third connecting pipe between the second cylinder and the first cylinder, and install the fourth connecting pipe between the third cylinder and the second cylinder; S14, using lifting equipment to hoist the second connecting bend and the third connecting bend to the appropriate positions, and installing the second connecting bend between the second cylinder and the first cylinder, and the third connecting bend between the third cylinder and the fourth cylinder; S15, a partial steel structure platform is installed between the first cylinder, the second cylinder, the third cylinder, the fourth cylinder, the fifth cylinder and the sixth cylinder; S16, Pre-installation of inclined ladder scaffolding for the reactor; S17, Integrated reinforced ring insulation construction for reactor; S18, The reactor was hoisted into place and secured using large lifting equipment; S19: Using the pre-installed scaffolding that is hoisted with the reactor, the remaining inclined ladders and steel structure platforms are installed safely and efficiently. S20, using the manufactured lifting fixture and connecting pipe support fixture, install the bottom connecting pipe and bottom bend of the reactor.
[0005] Furthermore, the specific steps of foundation treatment in step S2 are as follows: S21, excavate a foundation pit in the area corresponding to the equipment placement and assembly area and the crane positioning area, and use a road roller to compact the foundation soil layer; S22 uses three layers of lime-soil compacted and leveled, with a thick layer of crushed stone laid on top for hardening. Drainage ditches are set up around the perimeter, and a crane roadbed plate is laid on top of the foundation for hoisting operations.
[0006] Furthermore, the specific steps for conducting the bearing capacity test on the foundation in step S3 are as follows: S31. Select several locations at the center of each track / roadbed box as foundation bearing capacity test points. Use several counterweights from a crane to load the ground step by step. The ground pressure should not be less than twice the required ground bearing capacity. Stack the counterweights together at the test locations. Using the completed foundation near the test point as a reference elevation, evenly distribute and mark four reference points on the counterweights. Measure and record the initial values. S32, after standing for 24 hours, observe and measure the elevation of the four benchmark points again to obtain relevant data. The difference between the values before and after is the settlement of the counterweight.
[0007] Furthermore, in step S12, when hoisting the third cylinder, the second cylinder, and the first cylinder, the second cylinder is hoisted first.
[0008] Furthermore, before the reactor is hoisted, the elbows at the bottom of the six cylinders are pre-installed on the base discs on the ground, and reinforcing ribs are welded between the base discs for reinforcement. After reinforcement is completed, the elbows are removed.
[0009] Furthermore, in step S15, the steel structure platform is installed in a segmented manner from bottom to top. The installation stops when the platform reaches the elevation of an existing steel structure platform. After the load-bearing capacity of the steel structure platform is verified and reliable reinforcement is implemented, the next segment is erected upwards using this steel structure platform as a new foundation.
[0010] Furthermore, in step S16, the specific steps for the pre-installation of the inclined ladder scaffolding are as follows: during the ground assembly stage, the inclined ladder scaffolding required for the installation of the inclined ladder is erected in advance and firmly fixed to the first connecting beam and the second connecting beam of the reactor.
[0011] Furthermore, in step S18, the overall hoisting of the reactor adopts the "single main crane lifting and delivery method", that is, the main crane is used to lift the upper part of the reactor and the tail crane is used to lift the tail of the reactor. The two cranes first lift the reactor, then the main crane is responsible for lifting the reactor and the tail crane is responsible for delivery, so as to realize the reactor gradually transitioning from a horizontal state to a vertical state, completing the uprighting of the reactor. Then the auxiliary crane is unhooked, and the main crane vertically lifts the reactor, rotates it, and installs the reactor in place.
[0012] Furthermore, in S20, the lifting fixture includes a gantry frame, with a crossbeam at the top of the gantry frame. A central lifting lug is fixedly connected to the middle of the crossbeam, and upper lifting lugs are fixedly connected to both sides of the crossbeam. The connecting pipe support fixture includes a traveling frame, with a bracket at the top of the traveling frame. Two lower lifting lugs are fixedly connected to both the front and rear sides of the traveling frame. The specific installation steps for the reactor bottom connecting pipe and bottom bend are as follows: S201, the bottom connecting pipe is hoisted onto the bracket using lifting equipment; S202, place the two lifting fixtures together at the corresponding installation positions of the bottom connecting pipe, and push the connecting pipe support fixture together with the bottom connecting pipe to the target position; S203, chain hoists are suspended on all four upper lifting lugs, and the steel wire ropes of these four chain hoists are respectively connected to the four lower lifting lugs; S204, the bottom connecting pipe is gradually lifted to the installation position using four chain hoists, and the installation is completed; S205, push away the connecting pipe support fixture, and rotate the two lifting fixtures 90° and then reset them; S206, suspend chain hoists on two middle lifting lugs, and connect the steel wire ropes of these two chain hoists to both sides of the bottom bend respectively; S207 uses two chain hoists to gradually lift the bottom bend to the installation position and complete the installation.
[0013] Furthermore, in step S17, the specific steps for the integrated reinforcing ring insulation construction of the reactor are as follows: S171. Clean and dry the outer wall of the reactor, remove oil and rust, and remove rust from the welds welded on site. After rust removal, apply special anti-corrosion paint. S172, the insulation layer is laid in a layered staggered joint manner, and the joints of each insulation layer are staggered from the adjacent layers; S173, apply metal straps to the outer surface of the insulation layer to secure it, so as to prevent the reactor from loosening, deforming or sinking during long-term operation; S174 After the insulation layer is securely bundled, a metal protective layer is installed on its exterior to form a complete thermal insulation system.
[0014] Furthermore, the protective layer is installed in a bottom-up, overlapping manner against the prevailing wind direction.
[0015] The beneficial effects of this invention compared to the prior art are: The PP closed-loop tubular reactor installation method of this invention completes the assembly and fastening of the reactor shell, connecting beams, and part of the steel structure platform on a specially designed assembly platform, and sets up fixed scaffolding for the subsequent installation of inclined ladders. Special tooling is used to install the bottom connecting pipe and bottom bend of the reactor, thereby greatly reducing the amount of high-altitude work, improving not only the safety of the operation, but also effectively improving the work efficiency.
[0016] The PP closed-loop tubular reactor installation method described in this invention employs integrated reinforcing ring insulation technology, completing the construction of all insulation and protective layers on the ground. This integrates a high-performance insulation system with the equipment body, fundamentally eliminating the thermal bridging effect caused by the metal support ring and resulting in a more uniform temperature distribution on the surface of the insulation layer. Furthermore, the integrated reinforcing ring insulation structure enhances mechanical strength, avoiding the risk of delamination and detachment of the insulation layer due to vibration and its own weight. Moreover, ground-based construction offers significantly higher quality, precision, and efficiency compared to high-altitude operations. Attached Figure Description
[0017] Figure 1 This is a schematic diagram showing the placement of the fourth, fifth, and sixth cylinders of the present invention; Figure 2 This is a schematic diagram showing the placement of the first connecting pipe and the second connecting pipe of the present invention; Figure 3 This is a schematic diagram showing the placement of the first connecting bend and the first connecting beam of the present invention; Figure 4 This is a schematic diagram showing the placement of the second connecting beam of the present invention; Figure 5 This is a schematic diagram showing the placement of the third cylinder, the second cylinder, and the first cylinder of the present invention; Figure 6 This is a schematic diagram showing the placement of the third connecting pipe, the fourth connecting pipe, the second connecting bend, and the third connecting bend of the present invention. Figure 7 This is a schematic diagram of the structure of the connecting pipe support tool of the present invention supporting the bottom connecting pipe; Figure 8 This is a schematic diagram of the bottom connecting pipe of the present invention when it is installed in place; Figure 9 This is a schematic diagram of the structure when the bottom bend of the present invention is installed in place.
[0018] In the diagram: 1. Assembly platform; 2. Fourth cylinder; 3. Fifth cylinder; 4. Sixth cylinder; 5. First connecting pipe; 6. Second connecting pipe; 7. First connecting bend; 8. First connecting beam; 9. Second connecting beam; 10. Third cylinder; 11. Second cylinder; 12. First cylinder; 13. Third connecting pipe; 14. Fourth connecting pipe; 15. Third connecting bend; 16. Second connecting bend; 17. Traveling frame; 18. Lower lifting lug; 19. Bracket; 20. Bottom connecting pipe; 21. Gantry frame; 22. Upper lifting lug; 23. Middle lifting lug; 24. Crossbeam; 25. Bottom bend. Detailed Implementation
[0019] The embodiments of the present invention will be further described below with reference to the accompanying drawings: Example 1: like Figures 1 to 6 As shown, the installation and construction method of the PP closed-loop tubular reactor of the present invention mainly includes the following steps: S1. Clarify the site layout and determine the minimum ground bearing capacity at the crane lifting station based on the crane foundation stability verification calculation sheet; S2. Based on the engineering geological survey report, combined with the crane's requirements for ground bearing capacity, and taking into account the on-site hydrogeological conditions, the area requiring foundation treatment was marked out on-site and hardened. S3. The bearing capacity of the hardened foundation is tested using the weight method to ensure that the bearing capacity of the foundation meets the hoisting requirements. S4, multiple assembly platforms 1 are made according to the length of the reactor's cylindrical section; S5. Mark the lines on the hardened foundation to determine the placement of each assembly platform 1. Then use a crane to lift and place the assembly platform 1, and use shims for initial leveling. After all the assembly platforms 1 are installed in place, use a level to perform final leveling. S6, using lifting equipment to hoist the fourth cylinder 2, the fifth cylinder 3 and the sixth cylinder 4 onto the assembly platform 1 respectively, and using limiting components to temporarily limit the fourth cylinder 2, the fifth cylinder 3 and the sixth cylinder 4 to prevent them from sliding radially; S7. Using lifting equipment, make slight orientation adjustments to the fourth cylinder 2, the fifth cylinder 3, and the sixth cylinder 4 so that the flange openings on the fourth cylinder 2 and the sixth cylinder 4 correspond to the axes of the two flange openings on the fifth cylinder 3, respectively. Then, using lifting equipment, lift the first connecting pipe 5 and the second connecting pipe 6 to the appropriate positions, and install the first connecting pipe 5 between the fourth cylinder 2 and the fifth cylinder 3, and install the second connecting pipe 6 between the fifth cylinder 3 and the sixth cylinder 4. S8, based on the actual height on site, erect the first layer of scaffolding on both sides of the fourth cylinder 2, the fifth cylinder 3 and the sixth cylinder 4; S9, the first connecting bend 7 is hoisted to the appropriate position using a lifting device and installed between the fifth cylinder 3 and the sixth cylinder 4; at the same time, multiple first connecting beams 8 are installed between the fourth cylinder 2 and the fifth cylinder 3 and between the fifth cylinder 3 and the sixth cylinder 4. S10, multiple second connecting beams 9 are installed on the fourth cylinder 2, the fifth cylinder 3 and the sixth cylinder 4; S11, erect a second layer of scaffolding on the basis of the first layer of scaffolding; S12, using lifting equipment, the third cylinder 10, the second cylinder 11 and the first cylinder 12 are respectively hoisted and placed on the corresponding second connecting beams 9; S13, using lifting equipment to hoist the third connecting pipe 13 and the fourth connecting pipe 14 to the appropriate positions, and installing the third connecting pipe 13 between the second cylinder 11 and the first cylinder 12, and installing the fourth connecting pipe 14 between the third cylinder 10 and the second cylinder 11; S14, using lifting equipment to hoist the second connecting bend 16 and the third connecting bend 15 to the appropriate positions, and install the second connecting bend 16 between the second cylinder 11 and the first cylinder 12, and install the third connecting bend 15 between the third cylinder 10 and the fourth cylinder 2. S15, Install a partial steel structure platform between the first cylinder 12, the second cylinder 11, the third cylinder 10, the fourth cylinder 2, the fifth cylinder 3 and the sixth cylinder 4; S16, Pre-installation of inclined ladder scaffolding for the reactor; S17, Integrated reinforced ring insulation construction for reactor; S18, The reactor was hoisted into place and secured using large lifting equipment; S19: Using the pre-installed scaffolding that is hoisted with the reactor, the remaining inclined ladders and steel structure platforms are installed safely and efficiently. S20, the bottom connecting pipe 20 and the bottom bend 25 of the reactor are installed using the manufactured lifting fixture and connecting pipe support fixture.
[0020] The PP closed-loop tubular reactor installation method of this invention involves assembling and securing the reactor shell, connecting beams, and part of the steel structure platform, as well as the inclined ladder scaffolding required for the subsequent installation, all on a specially made assembly platform on the ground. The installation of the bottom connecting pipe 20 and the bottom bend 25 of the reactor is also completed on specially made tooling on the ground, which greatly reduces the amount of high-altitude work, improves not only operational safety but also work efficiency.
[0021] Example 2: like Figures 1 to 9 As shown, based on Example 1, Furthermore, the specific steps of foundation treatment in step S2 are as follows: S21, excavate a foundation pit in the area corresponding to the equipment placement and assembly area and the crane positioning area, and use a road roller to compact the foundation soil layer; S22 uses a 3:7 lime-soil mixture, which is compacted and leveled in three layers. A 200mm thick layer of crushed stone is laid on top for hardening. Drainage ditches are set up around the perimeter, and a crane roadbed is laid on top of the foundation for hoisting operations.
[0022] The main function of the crane roadbed plate is to provide a stable and safe working platform for heavy equipment such as cranes, and to prevent safety accidents such as tilting or sinking of the equipment during operation due to uneven ground or insufficient load-bearing capacity.
[0023] Furthermore, the specific steps for conducting the bearing capacity test on the foundation in step S3 are as follows: S31. Select several locations at the center of each track / roadbed box as foundation bearing capacity test points. Use several counterweights from a crane to load the ground step by step. The ground pressure should not be less than twice the required ground bearing capacity. Stack the counterweights together at the test locations. Using the completed foundation near the test point as a reference elevation, evenly distribute and mark four reference points on the counterweights. Measure and record the initial values. S32, after standing for 24 hours, observe and measure the elevation of the four benchmark points again to obtain relevant data. The difference between the values before and after is the settlement of the counterweight.
[0024] If the maximum settlement at each test point is not greater than the required value, then the foundation at the test location can meet the hoisting requirements.
[0025] Furthermore, in step S12, when hoisting the third cylinder 10, the second cylinder 11 and the first cylinder 12, the second cylinder 11 is hoisted first to avoid the jig tipping over when the third cylinder 10 or the first cylinder 12 is placed first.
[0026] Furthermore, before the reactor is hoisted, the elbows at the bottom of the six cylinders are pre-installed on the base discs on the ground, and reinforcing ribs are welded between the base discs for reinforcement. After reinforcement, the elbows are removed, which can effectively ensure that the reactor can be smoothly placed on the base discs when it is hoisted into place.
[0027] Furthermore, in step S15, the steel structure platform is installed in sections from bottom to top. Construction stops at the elevation of an existing steel structure platform, and the platform's load-bearing capacity is verified and reliably reinforced. Then, using this platform as a new foundation, the next section is erected. This method avoids the need for continuous construction from the ground to the top, effectively reducing the workload, construction risks, and costs.
[0028] Furthermore, in step S16, the specific steps for the pre-installation of the inclined ladder scaffolding are as follows: During the ground assembly stage, the inclined ladder scaffolding required for installation is erected in advance and firmly fixed to the first connecting beam 8 and the second connecting beam 9 of the reactor. The inclined ladder can be installed layer by layer along the already erected scaffolding during installation. After each layer is welded, the next layer of the inclined ladder is installed until the top layer, effectively reducing the difficulty of inclined ladder installation and improving installation efficiency.
[0029] Furthermore, in step S18, the overall hoisting of the reactor adopts the "single main crane lifting and delivery method", that is, the main crane is used to lift the upper part of the reactor and the tail crane is used to lift the tail of the reactor. The two cranes first lift the reactor, then the main crane is responsible for lifting the reactor and the tail crane is responsible for delivery, so as to realize the reactor gradually transitioning from a horizontal state to a vertical state, completing the uprighting of the reactor. Then the auxiliary crane is unhooked, and the main crane vertically lifts the reactor, rotates it, and installs the reactor in place.
[0030] Furthermore, in S20, the lifting fixture includes a gantry frame 21, with a crossbeam 24 at the top of the gantry frame 21. A middle lifting lug 23 is fixedly connected to the middle of the crossbeam 24, and upper lifting lugs 22 are fixedly connected to both sides of the crossbeam 24. The connecting pipe support fixture includes a traveling frame 17, with a bracket 19 at the top of the traveling frame 17. Two lower lifting lugs 18 are fixedly connected to both the front and rear sides of the traveling frame 17. The specific installation steps for the reactor bottom connecting pipe 20 and the bottom bend pipe 25 are as follows: S201, the bottom connecting pipe 20 is hoisted onto the bracket 19 using lifting equipment; S202, place the two lifting fixtures in the corresponding positions of the bottom connecting pipe 20, and push the connecting pipe support fixture together with the bottom connecting pipe 20 to the target position; S203, chain hoists are suspended on all four upper lugs 22, and the steel wire ropes of these four chain hoists are respectively connected to the four lower lugs 18; S204, the bottom connecting pipe 20 is gradually lifted to the installation position using four chain hoists, and the installation is completed; S205, push away the connecting pipe support fixture, and rotate the two lifting fixtures 90° and then reset them; S206, suspend chain hoists on the two middle lugs 23, and connect the steel wire ropes of the two chain hoists to both sides of the bottom bend 25 respectively; S207, the bottom bend 25 is gradually lifted to the installation position using two chain hoists, and the installation is completed.
[0031] Furthermore, in step S17, the specific steps for the integrated reinforcing ring insulation construction of the reactor are as follows: S171. Clean and dry the outer wall of the reactor, remove oil and rust, and remove rust from the welds welded on site. After rust removal, apply special anti-corrosion paint. S172, the insulation layer is laid in a layered staggered joint manner, and the joints of each insulation layer are staggered from the adjacent layers; S173, apply metal straps to the outer surface of the insulation layer to secure it, so as to prevent the reactor from loosening, deforming or sinking during long-term operation; S174 After the insulation layer is securely bundled, a metal protective layer is installed on its exterior to form a complete thermal insulation system.
[0032] Furthermore, the protective layer is installed in a bottom-up, overlapping manner against the prevailing wind direction.
[0033] The PP closed-loop tubular reactor installation method described in this invention employs integrated reinforcing ring insulation technology, completing the construction of all insulation and protective layers on the ground. This integrates a high-performance insulation system with the equipment body, fundamentally eliminating the thermal bridging effect caused by the metal support ring and resulting in a more uniform temperature distribution on the surface of the insulation layer. Furthermore, the integrated reinforcing ring insulation structure enhances mechanical strength, avoiding the risk of delamination and detachment of the insulation layer due to vibration and its own weight. Moreover, ground-based construction offers significantly higher quality, precision, and efficiency compared to high-altitude operations.
Claims
1. A method for installing and constructing a PP closed-loop tubular reactor, characterized in that, The main steps include: S1. Clarify the site layout and determine the minimum ground bearing capacity at the crane lifting station based on the crane foundation stability verification calculation sheet; S2. Based on the engineering geological survey report, combined with the crane's requirements for ground bearing capacity, and taking into account the on-site hydrogeological conditions, the area requiring foundation treatment was marked out on-site and hardened. S3. The bearing capacity of the hardened foundation is tested using the weight method to ensure that the bearing capacity of the foundation meets the hoisting requirements. S4, multiple assembly platforms are made according to the length of the reactor shell section (1). S5, mark the lines on the hardened foundation to determine the placement of each assembly platform (1), then use a crane to lift and place the assembly platform (1), and use shims for initial leveling. After all the assembly platforms (1) are installed in place, use a level to perform final leveling. S6, the fourth cylinder (2), the fifth cylinder (3) and the sixth cylinder (4) are hoisted and placed on the assembly platform (1) respectively using hoisting equipment, and the fourth cylinder (2), the fifth cylinder (3) and the sixth cylinder (4) are temporarily limited by limiting components to prevent them from sliding radially; S7. Using lifting equipment, make slight orientation adjustments to the fourth cylinder (2), the fifth cylinder (3) and the sixth cylinder (4) so that the flanges on the fourth cylinder (2) and the sixth cylinder (4) correspond to the axes of the two flanges on the fifth cylinder (3). Then, using lifting equipment, hoist the first connecting pipe (5) and the second connecting pipe (6) to the appropriate positions, and install the first connecting pipe (5) between the fourth cylinder (2) and the fifth cylinder (3), and install the second connecting pipe (6) between the fifth cylinder (3) and the sixth cylinder (4). S8, based on the actual height on site, the first layer of scaffolding is erected on both sides of the fourth cylinder (2), the fifth cylinder (3) and the sixth cylinder (4); S9, the first connecting bend (7) is hoisted to the appropriate position using a lifting device and installed between the fifth cylinder (3) and the sixth cylinder (4); at the same time, multiple first connecting beams (8) are installed between the fourth cylinder (2) and the fifth cylinder (3) and between the fifth cylinder (3) and the sixth cylinder (4). S10, multiple second connecting beams (9) are installed on the fourth cylinder (2), the fifth cylinder (3) and the sixth cylinder (4); S11, erect a second layer of scaffolding on the basis of the first layer of scaffolding; S12, using lifting equipment, the third cylinder (10), the second cylinder (11) and the first cylinder (12) are respectively hoisted and placed on the corresponding second connecting beams (9); S13, using lifting equipment to hoist the third connecting pipe (13) and the fourth connecting pipe (14) to the appropriate position, and install the third connecting pipe (13) between the second cylinder (11) and the first cylinder (12), and install the fourth connecting pipe (14) between the third cylinder (10) and the second cylinder (11); S14, using lifting equipment to hoist the second connecting bend (16) and the third connecting bend (15) to the appropriate position, and install the second connecting bend (16) between the second cylinder (11) and the first cylinder (12), and install the third connecting bend (15) between the third cylinder (10) and the fourth cylinder (2); S15, a partial steel structure platform is installed between the first cylinder (12), the second cylinder (11), the third cylinder (10), the fourth cylinder (2), the fifth cylinder (3) and the sixth cylinder (4); S16, Pre-installation of inclined ladder scaffolding for the reactor; S17, Integrated reinforced ring insulation construction for reactor; S18, The reactor was hoisted into place and secured using large lifting equipment; S19: Using the pre-installed scaffolding that is hoisted with the reactor, the remaining inclined ladders and steel structure platforms are installed safely and efficiently. S20, the bottom connecting pipe (20) and bottom bend (25) of the reactor are installed using the manufactured lifting fixture and connecting pipe support fixture.
2. The installation and construction method of the PP closed-loop tubular reactor according to claim 1, characterized in that, The specific steps for foundation treatment in S2 are as follows: S21, excavate a foundation pit in the area corresponding to the equipment placement and assembly area and the crane positioning area, and use a road roller to compact the foundation soil layer; S22 uses three layers of lime-soil compacted and leveled, with a thick layer of crushed stone laid on top for hardening. Drainage ditches are set up around the perimeter, and a crane roadbed plate is laid on top of the foundation for hoisting operations.
3. The installation and construction method of the PP closed-loop tubular reactor according to claim 1, characterized in that, The specific steps for conducting the bearing capacity test of the foundation in S3 are as follows: S31. Select several locations at the center of each track / roadbed box as foundation bearing capacity test points. Use several counterweights from a crane to load the ground step by step. The ground pressure should not be less than twice the required ground bearing capacity. Stack the counterweights together at the test locations. Using the completed foundation near the test point as a reference elevation, evenly distribute and mark four reference points on the counterweights. Measure and record the initial values. S32, after standing for 24 hours, observe and measure the elevation of the four benchmark points again to obtain relevant data. The difference between the values before and after is the settlement of the counterweight.
4. The installation and construction method of the PP closed-loop tubular reactor according to claim 1, characterized in that, Before the reactor is hoisted, the elbows at the bottom of the six cylinders are pre-installed on the base discs on the ground, and reinforcing ribs are welded between the base discs for reinforcement. After reinforcement is completed, the elbows are removed.
5. The installation and construction method of the PP closed-loop tubular reactor according to claim 1, characterized in that, In S15, the steel structure platform is installed in a segmented manner from bottom to top. The installation stops when the platform reaches the elevation of an existing steel structure platform. After the load-bearing capacity of the steel structure platform is verified and reliable reinforcement is implemented, the next segment is erected upwards using this steel structure platform as a new foundation.
6. The installation and construction method of the PP closed-loop tubular reactor according to claim 1, characterized in that, In S16, the specific steps for the pre-installation of the inclined ladder scaffolding are as follows: during the ground assembly stage, the inclined ladder scaffolding required for the installation of the inclined ladder is erected in advance and firmly fixed on the first connecting beam (8) and the second connecting beam (9) of the reactor.
7. The installation and construction method of the PP closed-loop tubular reactor according to claim 1, characterized in that, In S18, the overall hoisting of the reactor adopts the "single main crane lifting and delivery method", that is, the main crane is used to lift the upper part of the reactor and the tail crane is used to lift the tail of the reactor. The two cranes first lift the reactor, then the main crane is responsible for lifting the reactor and the tail crane is responsible for delivery, so as to realize the reactor gradually transitioning from a horizontal state to a vertical state, completing the uprighting of the reactor. Then the auxiliary crane is unhooked, and the main crane vertically lifts the reactor, rotates it, and installs the reactor in place.
8. The installation and construction method of the PP closed-loop tubular reactor according to claim 1, characterized in that, In S20, the lifting fixture includes a gantry frame (21), the top of which is provided with a crossbeam (24), a middle lifting lug (23) is fixedly connected to the middle of the crossbeam (24), and upper lifting lugs (22) are fixedly connected to both sides of the crossbeam (24); the connecting pipe support fixture includes a traveling frame (17), the top of which is provided with a bracket (19), and two lower lifting lugs (18) are fixedly connected to both the front and rear sides of the traveling frame (17); the specific installation steps of the reactor bottom connecting pipe (20) and the bottom bend pipe (25) are as follows: S201, the bottom connecting pipe (20) is hoisted onto the bracket (19) using a lifting device; S202, place the two lifting fixtures together at the corresponding installation positions of the bottom connecting pipe (20), and push the connecting pipe support fixture together with the bottom connecting pipe (20) to the target position; S203, chain hoists are suspended on the four upper lugs (22), and the steel wire ropes of the four chain hoists are connected to the four lower lugs (18); S204, the bottom connecting pipe (20) is gradually lifted to the installation position using four chain hoists, and the installation is completed; S205, push away the connecting pipe support fixture, and rotate the two lifting fixtures 90° and then reset them; S206, suspend chain hoists on the two middle lugs (23) and connect the steel wire ropes of the two chain hoists to the two sides of the bottom bend (25); S207, the bottom bend (25) is gradually lifted to the installation position by two chain hoists and the installation is completed.
9. The installation and construction method of the PP closed-loop tubular reactor according to any one of claims 1 to 8, characterized in that, In step S17, the specific steps for the integrated reinforcing ring insulation construction of the reactor are as follows: S171. Clean and dry the outer wall of the reactor, remove oil and rust, and remove rust from the welds welded on site. After rust removal, apply special anti-corrosion paint. S172, the insulation layer is laid in a layered staggered joint manner, and the joints of each insulation layer are staggered from the adjacent layers; S173, apply metal straps to the outer surface of the insulation layer to secure it, so as to prevent the reactor from loosening, deforming or sinking during long-term operation; S174 After the insulation layer is securely bundled, a metal protective layer is installed on its exterior to form a complete thermal insulation system.
10. The installation and construction method of the PP closed-loop tubular reactor according to claim 5, characterized in that, The protective layer is installed from bottom to top, overlapping sequentially against the prevailing wind direction.