A large pipe horizontal installation method for dehydrogenation reactor

Abstract

The application discloses a large pipe horizontal installation method of a dehydrogenation reactor, belongs to the technical field of dehydrogenation reactor manufacturing, and comprises the following steps: determining a four-equal-part reference point of a cylinder body; determining a reference point of a supporting leg installation; installing the supporting leg and a bottom plate; determining a reference point of a pipe installation; installing ABC, EH and F pipes; detecting the overall levelness in six steps; and horizontally assembling and installing the ABC, EH and F pipes with the cylinder body. A hoisting and auxiliary equipment is further arranged to perform pipe hoisting and assembling work, wherein the equipment comprises a hoisting mechanism and a supporting mechanism. The application discloses a large pipe horizontal installation method of a dehydrogenation reactor, belongs to the technical field of dehydrogenation reactor manufacturing, and comprises the following steps: determining a four-equal-part reference point of a cylinder body; determining a reference point of a supporting leg installation; installing the supporting leg and a bottom plate; determining a reference point of a pipe installation; installing ABC, EH and F pipes; detecting the overall levelness in six steps; and horizontally assembling and installing the ABC, EH and F pipes with the cylinder body. A hoisting and auxiliary equipment is further arranged to perform pipe hoisting and assembling work, wherein the equipment comprises a hoisting mechanism and a supporting mechanism.

Description

Technical Field

[0001] This invention mainly relates to the field of dehydrogenation reactor manufacturing technology, specifically a method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor. Background Technology

[0002] With the trend towards larger-scale domestic plant construction, pressure vessel equipment is also rapidly becoming larger. Meanwhile, traditional propylene production technologies have reached a bottleneck in recent years due to low propylene yields, failing to meet the growing domestic demand. Adopting advanced technologies such as propane dehydrogenation using the world's most advanced Lummus process has become a crucial means of propylene production. The quality and installation precision of the reactor, the core equipment of the propane dehydrogenation unit, directly affect the normal operation of the plant. The dehydrogenation reactor has a complex piping structure, consisting of irregularly shaped parts, and it is essential to ensure that the support leg base plate remains level with the flange faces of the three large piping sections. Therefore, the manufacturing precision requirements for the reactor equipment are extremely high.

[0003] The structure of the dehydrogenation reactor equipment, such as Figure 1 As shown, during the manufacturing process, because the ABC pipe extension height reaches 8.25 meters and the EH and F pipe extension height reaches 4.6 meters, if the traditional vertical pipe installation method is used, a foundation platform needs to be constructed to raise the roller frame by more than 5.1 meters. This not only requires a large investment in tooling and materials, but also, under these conditions, the installation height of the ABC pipe will reach approximately 17 meters, which will greatly reduce installation efficiency, bring great difficulties to measurement, and pose significant safety hazards during construction. Summary of the Invention

[0004] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. It primarily offers a method for horizontally installing large nozzles in dehydrogenation reactors, thereby resolving the issues raised in the background section regarding the low installation efficiency and significant safety hazards associated with traditional vertical nozzle installation methods.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A method for horizontally installing a large inlet pipe of a dehydrogenation reactor includes the following steps: S1. Determine the four equal division reference points of the cylinder: Determine the four equal division lines of 0°, 90°, 180°, and 270°; S2. Determine the reference point for outrigger installation: First, calculate the vertical distance from the outrigger base plate to the reference point at the bottom of the cylinder. Then, based on the cylinder reference point, establish virtual reference points at the same elevation in the vertical direction of each reference point. S3. Install outriggers and base plate: First, install the four outriggers and base plate in sequence according to the drawings; then use a theodolite to measure the distance from the virtual reference point to the generatrix at the bottom of the cylinder, and the distance from the virtual reference point to the lower surface of the outrigger base plate, and perform calibration. S4. Determine the reference point for pipe installation: Rotate the cylinder 90 degrees; S5, ABC, EH, and F pipe installation: ABC, EH, and F pipes are all installed horizontally with the cylinder. S6. Overall levelness test.

[0006] Furthermore, in step S3, after measuring the distance using a theodolite, the support plate is finely adjusted to the standard size using a bolt fine-tuning fixture, and the bolt fixture is tightened to fix the base plate to prevent welding deformation.

[0007] Furthermore, in step S4, a theodolite is used to measure the height difference between the two ends of the 0°-0° generatrix of the cylinder, and the slope of its axial direction is calculated.

[0008] Further, in step S5, when installing the E / H pipe, the pipe hoisting assembly is as follows: the four-equal division line at the end of the pipe E cylinder is aligned with the four-equal division line at the opening of the cylinder for alignment and installation, and initial fixation is performed; then, the relative elevation of the center line of the outer side of the E and H flanges is measured using a theodolite, and the corresponding slope is calculated to be consistent with the slope in the direction of the cylinder axis; otherwise, fine adjustments are made until they are the same. When installing the ABC connector, the connector hoisting assembly should align the four equal division lines at the end of the connector cylinder with the four equal division lines at the opening of the cylinder, install it, and make preliminary fixation; then use a theodolite to measure the relative elevation of the center line of the outer span of the B and C flanges, and calculate the corresponding slope to keep it consistent with the slope in the direction of the cylinder axis. Otherwise, make fine adjustments until they are the same.

[0009] As an improvement to the above scheme, in step S5, when assembling the pipe, a hoisting and auxiliary equipment is used. The structure of the hoisting and auxiliary equipment is as follows: it includes a hoisting mechanism for hoisting the pipe and a support mechanism for limiting the position of the pipe. The hoisting mechanism includes a circular ring, a main hoisting rope, four mounting boxes and four branch hoisting ropes. The main hoisting rope is located on the central axis of the circular ring. The four mounting boxes are installed at equal intervals on the circular ring. Each mounting box leads out a branch hoisting rope. The mounting box is equipped with a reel for winding and unwinding the branch hoisting rope and a drive motor for driving the reel to rotate. The support mechanism includes a support base, a first main support plate, a second main support plate, a first side support plate, and a second side support plate. Pressure sensors are installed on the upper surfaces of the first main support plate, the second main support plate, the first side support plate, and the second side support plate. A pair of push clamps and a drive mechanism for driving the push clamps to move are installed on the first main support plate and the second main support plate. The drive mechanism is located inside the main support plate.

[0010] Furthermore, a cross link is connected to the inner side of the ring body, and the lower end of the main hoisting rope is connected to the center of the cross link.

[0011] Preferably, a cross link is connected to the inner side of the ring body, the lower end of the main hoisting rope is connected to the center of the cross link, and the remaining lower end of the main hoisting rope is connected to the periphery of the ring body at equal intervals.

[0012] Furthermore, the mounting box is connected to the ring body by mounting buckles.

[0013] Further optimization involves connecting a detachable lifting adjuster to the bottom of the first main support plate, the second main support plate, the first side support plate, and the second side support plate. Two limiting strips are installed on the support plate, with the length direction of the limiting strips parallel to the vertical center plane that bisects the first and second main support plates. The two limiting strips respectively clamp the lifting adjusters located on both sides below the first and second main support plates.

[0014] Furthermore, the drive mechanism includes a dual-axis motor located in the middle, and a first lead screw and a second lead screw respectively connected to both ends of the dual-axis motor. The ends of the first lead screw and the second lead screw facing away from the dual-axis motor are both connected to the main support plate through bearings. The threads of the first lead screw and the second lead screw have opposite directions. Slider blocks are fitted onto the first lead screw and the second lead screw. A connecting block that is fixedly connected to the push clamp plate is fixed on the slider. Strip grooves are opened on the surfaces of the first main support plate and the second main support plate for the connecting block to pass through and move horizontally.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention abandons the traditional method of vertically installing pipes and adopts a horizontal installation method for large pipes, which brings the following advantages: ① Saves on support tooling materials: If the traditional vertical assembly method is used, due to the influence of the pipe extension height, eight reactors would have to be raised to a height of over 5.1 meters using tooling platforms. The horizontal assembly method eliminates the need to raise the reactors, reducing costs and avoiding safety risks.

[0016] ② Improve the efficiency of pipe assembly and outrigger assembly: The horizontal assembly method is adopted, and the operating platform for assembling the pipe is only 5 meters high, which greatly facilitates pipe assembly work and measurement and shortens the pipe assembly time.

[0017] ③ Ensuring Assembly Accuracy: A horizontal assembly method was adopted, which, while saving on construction and safety measures, simultaneously ensured the installation accuracy of all large connecting pipes and outriggers. The axial spacing of the four outriggers is 9182mm, and the radial spacing is 8550mm. The levelness requirement for the base plates of the four outriggers is ±3mm. This method controlled the levelness to ±1.5mm, ensuring the stability and safety of the reactor under harsh operating conditions.

[0018] ④ Convenient and accurate measurement: The horizontal assembly method ensures measurement during assembly, real-time control during welding, and inspection after welding. Measurement reference selection and operation can be performed on the ground, which is simple and easy to control.

[0019] When determining the reference points for outrigger installation, this invention establishes virtual reference points at the same elevation in the vertical direction of each reference point, based on the cylinder reference point. This solves the problem that theodolite measurement technology cannot directly measure and aim at the reference points on the cylinder surface, thus facilitating the determination of reference points for outrigger installation. Subsequently, when installing the outriggers and base plate, theodolite measures the distance from the virtual reference point to the generatrix at the bottom of the cylinder and the distance from the virtual reference point to the lower surface of the outrigger base plate for calibration, making construction more convenient. The optimized solution of this invention includes a hoisting mechanism and a support mechanism. During the hoisting and assembly of the connector, each end of the connector is suspended by a separate hoisting rope. During the lowering process, the horizontal offset of the connector is corrected by the mutual movement of the push-pull clamps on the two main support plates. Then, the vertical offset of the connector end is determined by whether the pressure sensors on the main support plates and the side support plates are triggered simultaneously. If some sensors that should be triggered are not triggered, it indicates that the corresponding end of the connector is too high. The corresponding hoisting rope is then lowered until all pressure sensors are triggered, thereby correcting the vertical offset of the connector and ultimately ensuring that the connector is accurately positioned at the target location. The present invention also optimizes the support mechanism, so that the position and height of the main support plate and the side support plate are adjustable, making the hoisting and auxiliary equipment applicable to the hoisting assembly of ABC pipes, EH pipes and F pipes. The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the dehydrogenation reactor in this invention; Figure 2This is a flowchart of the construction method of the present invention; Figure 3 This is a schematic diagram showing the four equal divisions of the reference points of the dehydrogenation reactor cylinder in the embodiment. Figure 4 This is a schematic diagram of the reference points for the support leg installation in the embodiment; Figure 5 This is a schematic diagram of the reference points for the pipe installation in the embodiment; Figure 6 This is a schematic diagram of the hoisting and auxiliary equipment for pipe installation in this invention; Figure 7 This is a three-dimensional structural diagram of the hoisting mechanism in this invention; Figure 8 This is a schematic diagram of the internal structure of the mounting box in the hoisting mechanism; Figure 9 This is a three-dimensional structural diagram of the support mechanism in this invention; Figure 10 This is a schematic diagram of the internal structure of the main support plate in the support mechanism.

[0021] Figure label: 1. Circular ring; 2. Cross link; 3. Main hoisting rope; 4. Mounting buckle; 5. Mounting box; 6. Branch hoisting ropes; 7. Drive motor; 8. Cable reel; 10. Hoisting mechanism; 11. First side support plate; 12. Pressure sensor; 13. First main support plate; 14. Second side support plate; 15. Lifting adjuster; 16. Strip groove; 17. Push clamp plate; 18. Second main support plate; 19. Support base; 20. Support mechanism; 21. Limiting strip; 22. Sliding block; 23. First lead screw; 24. Dual-axis motor; 25. Second lead screw; 26. Connecting block. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0023] Example 1: Please refer to the appendix for details. Figure 2 A method for horizontally installing a large nozzle in a dehydrogenation reactor includes the following steps: S1. Determine the reference points for dividing the cylinder into four equal parts. like Figure 3As shown, firstly, the circumferential direction at both ends of the cylinder is divided into four equal parts (0°, 90°, 180°, 270°). Using a plumb line, the cylinder is aligned at the 0°, 180°, 90°, and 270° directions. Then, a theodolite is used to measure whether the four corresponding points at 90° and 270° on both ends of the cylinder are on the same horizontal plane, and adjustments are made to determine these four points as reference points.

[0024] S2. Determine the reference points for outrigger installation. 1. Calculate the vertical distance h1 from the support leg base plate to the 180° reference point according to the drawings, such as... Figure 4 As shown; 2. Since theodolite surveying technology cannot directly measure the reference points on the surface of the aiming cylinder, virtual reference points are established at the same elevation h2 in the vertical direction of each reference point, based on the cylinder's reference points. For example... Figure 4 As shown.

[0025] S3. Install the outriggers and base plate; 1. Install the four support legs and base plate in sequence according to the drawings.

[0026] 2. Use a theodolite to measure the distance from the virtual reference point to the 180° generatrix, and measure the distance from the virtual reference point to the lower surface of the outrigger base plate. Then, use a bolt fine-tuning fixture to fine-tune the support plate to the standard dimensions, and tighten the bolt fixture to fix the base plate to prevent welding deformation.

[0027] S4. Determine the reference point for pipe installation. After the outriggers are installed, rotate the cylinder 90 degrees so that the 0° and 180° positions are horizontal. Figure 5 As shown; use a theodolite to measure the height difference between the two ends of the 0°-0° generatrix of the cylinder, and calculate its axial slope.

[0028] S5, ABC, EH, F pipe installation 1. E / H pipe installation (1) Since the pipe opening E and the pipe opening H have an angle of 25.9° in the axial direction, the relative elevation difference between the pipe opening E and the pipe opening H in the vertical direction is calculated before installation for the convenience of installation and measurement.

[0029] (2) Hoisting and assembly of the nozzle: Align and install the nozzle E by aligning the four-part line at the end of the cylinder with the four-part line at the opening of the cylinder, and make preliminary fixation. Then, use a theodolite to measure the relative elevation of the center line of the outer side of flanges E and H respectively, and calculate the corresponding slope to keep it consistent with the slope of the cylinder axis. Otherwise, make fine adjustments until they are the same.

[0030] (3) Perform welding connection.

[0031] 2. F-pipe installation Pipe hoisting and assembly: Align and install the pipe F by aligning the four bisectors at the end of the cylinder with the four bisectors at the opening of the cylinder, and perform initial fixing. Then, use a theodolite to measure and calibrate. Finally, weld the connection.

[0032] 3. ABC pipe installation (1) Before hoisting the ABC pipe, first mark the three flange faces A, B, and C and the end of the pipe body to determine the center line of the three flange faces and the four bisectors of the end of the pipe body, and mark them in the corresponding positions.

[0033] (2) Hoisting and assembly of the pipe: Align and install the pipe by aligning the four-part lines at the end of the pipe cylinder with the four-part lines at the opening of the cylinder, and make preliminary fixation. Then, use a theodolite to measure the relative elevation of the center line of the outer side of flanges B and C, and calculate the corresponding slope to keep it consistent with the slope of the cylinder axis. Otherwise, make fine adjustments until they are the same.

[0034] (3) Perform welding connection.

[0035] S6. Overall levelness test Detect the distance from each pipe flange to the equipment at 90° and the distance from each pipe flange to the equipment at 270°, and fine-tune each pipe flange so that the distance from each pipe flange to the equipment at 90° is equal to the distance to the equipment at 270°.

[0036] Example 2: The difference between this example and Example 1 is that: In step S5, when hoisting and assembling the pipe, the following method is used: Figure 6 The hoisting and auxiliary equipment shown are used, and the structure of the equipment is as follows: like Figure 6 As shown, it includes a hoisting mechanism for hoisting the pipe and a support mechanism 20 for limiting the position of the pipe; like Figure 7 As shown, the hoisting mechanism 10 includes a circular ring 1, a main hoisting rope 3, four mounting boxes 5, and four branch hoisting ropes 6. The main hoisting rope 3 is located on the central axis of the circular ring 1. A cross link 2 is connected to the inner side of the circular ring 1, and the lower end of the main hoisting rope 3 is connected to the center of the cross link 2. The four mounting boxes 5 are installed at equal intervals on the circular ring 1, and the mounting boxes 5 are connected to the circular ring 1 by mounting buckles 4. Figure 8 As shown, each mounting box 5 has a separate lifting rope 6 extending out. The mounting box 5 is equipped with a spool 8 for winding and unwinding the lifting rope 6 and a drive motor 7 for driving the spool 8 to rotate forward and backward. like Figure 9As shown, the support mechanism 20 includes a support base 19, a first main support plate 13, a second main support plate 18, a first side support plate 11, and a second side support plate 14. Pressure sensors 12 are embedded in the upper surfaces of the first main support plate 13, the second main support plate 18, the first side support plate 11, and the second side support plate 14. A pair of push clamping plates 17 and a driving mechanism for moving the push clamping plates 17 are installed on both the first main support plate 13 and the second main support plate 18. The driving mechanism is located inside the main support plate. Strip grooves 16 are formed on the surfaces of the first main support plate 13 and the second main support plate 18 for the connecting block 26 to pass through and move horizontally. Figure 10 As shown, the drive mechanism includes a dual-axis motor 24 located in the middle, and a first lead screw 23 and a second lead screw 25 respectively connected to both ends of the dual-axis motor 24. The ends of the first lead screw 23 and the second lead screw 25 facing away from the dual-axis motor 24 are both connected to the main support plate through bearings. The threads of the first lead screw 23 and the second lead screw 25 have opposite directions. Slider blocks 22 are fitted onto the first lead screw 23 and the second lead screw 25. A connecting block 26 fixedly connected to the push clamp plate 17 is fixed on the slider 22.

[0037] When installing the ABC connector, the four separate lifting ropes 6 are tied to both ends of pipe A, the flange end of pipe B, and the flange end of pipe C, respectively, and then lifted using the main lifting rope 3. Simultaneously, the position of the support base 19 is adjusted so that the vertical center planes of the first main support plate 13 and the second main support plate 18 are aligned with the vertical center line of the connection port on the reactor cylinder. The upper surfaces of the first main support plate 13, the second main support plate 18, the first side support plate 11, and the second side support plate 14 are respectively located at the corresponding bottom heights of the ABC connector after it is installed on the reactor cylinder (obtained through pre-measurement and calculation). Then, the ABC connector to be installed is lifted and lowered to the location of the support mechanism 20. During the lifting and lowering process, the ABC connector may shift horizontally, the end of pipe A may shift longitudinally, pipe B may be too low or too high, and pipe C may be too low or too high. These deviations are corrected using the lifting mechanism 10 and the support mechanism 20. First, regarding the issue of the ABC connector shifting in the horizontal plane, the two push clamping plates 17 on the first main support plate 13 and the second main support plate 18 are driven to move synchronously and move closer to each other until they clamp the A pipe, so that the axis of the A pipe is located on the vertical center plane that bisects the first main support plate 13 and the second main support plate 18, thereby correcting the shift of the ABC connector in the horizontal plane. Secondly, regarding the issue of pipe A shifting in the longitudinal direction, during the hoisting and lowering of the ABC pipe, since the height difference between the first main support plate 13 and the second main support plate 18 has been determined, if the axis of pipe A has not shifted, the pressure sensors 12 on both main support plates should be triggered simultaneously. When one pressure sensor 12 on one main support plate is triggered while the other is not, it indicates that the end of pipe A has shifted in the longitudinal direction. At this time, the control rope 6 corresponding to the pressure sensor 12 that should have been triggered but was not is lowered until the corresponding pressure sensor 12 is triggered. At this time, both ends of pipe A contact the first main support plate 13 and the second main support plate 18 respectively, thereby correcting the shift of pipe A in the longitudinal direction.

[0038] Finally, regarding the issue of pipe B being too low (pipe C being too high) or pipe B being too high (pipe C being too low), during the hoisting and lowering of the ABC pipes, since the height difference between the first side support plate 11 and the second side support plate 14 has been determined, if pipes B and C are not offset, the pressure sensors 12 on both side support plates should be triggered simultaneously. When one side support plate's pressure sensor 12 is triggered while the other is not, it indicates that pipe A has deflected. At this time, the control is used to lower the corresponding lifting rope 6 of the pressure sensor 12 that should have been triggered but was not, until the corresponding pressure sensor 12 is triggered. At this time, pipes B and C contact the first side support plate 11 and the second side support plate 14 respectively, thereby correcting the offset of pipes B and C.

[0039] By combining the above three correction schemes, the ABC connector was corrected and limited, ultimately maintaining the ABC connector in the target state and aligning it with the corresponding connection port on the reactor cylinder. After the assembly and welding were completed, the hoisting mechanism was disassembled.

[0040] Everything else is the same as in Example 1.

[0041] Example 3: The difference between this example and Example 2 is that: like Figure 7 As shown, a cross link 2 is connected to the inner side of the annular body 1. The lower end of the main lifting rope 3 branches off and connects to the center of the cross link 2. The remaining lower end of the main lifting rope 3 is connected to the circumference of the annular body 1 at equal intervals. This arrangement can improve the stability of the annular body 1 under the lifting of the main lifting rope 3, laying a good foundation for the lifting of the branch lifting ropes 6.

[0042] like Figure 9As shown, the bottoms of the first main support plate 13, the second main support plate 18, the first side support plate 11, and the second side support plate 14 are all connected to detachable lifting adjusters 15 mounted on the support base 19 to adjust the position and height of each support plate. Two limiting strips 21 are installed on the support base 19. The length direction of the limiting strips 21 is parallel to the vertical center plane bisecting the first main support plate 13 and the second main support plate 18, and the two limiting strips 21 respectively clamp the lifting adjusters 15 located below the first main support plate 13 and the second main support plate 18 on both sides, ensuring that the two main support plates are always kept on the same axis. This arrangement allows the hoisting equipment and auxiliary equipment to be used for hoisting assemblies of ABC pipes, E / H pipes, and F pipes.

[0043] When installing the E / H pipe, only three branch suspension ropes 6, two main support plates, and one side support plate are used. First, the horizontal correction process of pipe A in the first step of embodiment two is used to correct the horizontal deviation of the E / H pipe. Then, with the cooperation of pressure sensor 12, the branch suspension rope 6 at the higher end is controlled to be lowered to correct the vertical deviation of the E / H pipe.

[0044] When installing the F-connector, only two branch suspension ropes 6 and two main support plates are used; first, the horizontal correction process of the A-connector in the first step of Example 2 is used to correct the F-connector in the horizontal direction, and then the vertical correction process of the A-connector in the second step is used to correct the F-connector in the vertical direction.

[0045] The rest is the same as in Example 2.

[0046] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A method for horizontally installing a large-scale nozzle in a dehydrogenation reactor, characterized in that: Includes the following steps: S1. Determine the four equal division reference points of the cylinder: Determine the four equal division lines of 0°, 90°, 180°, and 270°; S2. Determine the reference points for outrigger installation: First, calculate the vertical distance from the outrigger base plate to the 180° reference point at the bottom of the cylinder. Then, based on the four equal divisions of the cylinder reference points at 0°, 90°, 180°, and 270°, establish virtual reference points at the same elevation in the vertical direction of each reference point. S3. Install outriggers and outrigger base plates: First, install the four outriggers and outrigger base plates in sequence according to the drawings; then use a theodolite to measure the distance from the virtual reference point to the 180° generatrix at the bottom of the cylinder, and the distance from the virtual reference point to the lower surface of the outrigger base plate, and perform calibration. S4. Determine the reference point for pipe installation: Rotate the cylinder 90 degrees so that 0° and 180° are in a horizontal position; S5, ABC, EH, and F pipe installation: ABC, EH, and F pipes are all installed horizontally with the cylinder. S6. Overall levelness inspection; In step S5, when assembling the pipe, a hoisting and auxiliary equipment is used. The structure of the hoisting and auxiliary equipment is as follows: it includes a hoisting mechanism (10) for hoisting the pipe and a support mechanism (20) for limiting the pipe. The hoisting mechanism (10) includes a ring body (1), a main hoisting rope (3), four mounting boxes (5) and four branch hoisting ropes (6). The main hoisting rope (3) is located on the central axis of the ring body (1). The four mounting boxes (5) are installed at equal intervals on the ring body (1). Each mounting box (5) leads out a branch hoisting rope (6). The mounting box (5) is provided with a coil (8) for winding and unwinding the branch hoisting rope (6) and a drive motor (7) for driving the coil (8) to rotate. The support mechanism (20) includes a support base (19), a first main support plate (13), a second main support plate (18), a first side support plate (11), and a second side support plate (14). Pressure sensors (12) are installed on the upper surfaces of the first main support plate (13), the second main support plate (18), the first side support plate (11), and the second side support plate (14). A pair of push clamps (17) and a drive mechanism for driving the push clamps (17) to move are installed on the first main support plate (13) and the second main support plate (18). The drive mechanism is located inside the main support plate.

2. The method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor according to claim 1, characterized in that: In step S4, a theodolite is used to measure the height difference between the two ends of the 0°-0° generatrix of the cylinder and to calculate the slope of its axial direction.

3. The method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor according to claim 1, characterized in that: In step S5, during the installation of the E / H connector, the connector hoisting assembly is as follows: the four-equal division line at the end of the E cylinder body is aligned with the four-equal division line at the opening of the cylinder body for alignment and installation, and initial fixation is performed; then, the theodolite is used to measure the relative elevation of the center line of the outer side of the E and H flanges respectively, and the corresponding slope is calculated to be consistent with the slope in the direction of the cylinder axis; otherwise, fine adjustments are made until they are the same. When installing the ABC connector, the connector hoisting assembly should align the four equal division lines at the end of the connector cylinder with the four equal division lines at the opening of the cylinder, install it, and make preliminary fixation; then use a theodolite to measure the relative elevation of the center line of the outer span of the B and C flanges, and calculate the corresponding slope to keep it consistent with the slope in the direction of the cylinder axis. Otherwise, make fine adjustments until they are the same.

4. The method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor according to claim 1, characterized in that: The inner side of the ring (1) is connected to a cross link (2), and the lower end of the main hoisting rope (3) is connected to the center of the cross link (2).

5. The method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor according to claim 1, characterized in that: The inner side of the ring (1) is connected to a cross link (2), the lower end of the main hoisting rope (3) is connected to the center of the cross link (2), and the remaining part of the lower end of the main hoisting rope (3) is connected to the periphery of the ring (1) at equal intervals.

6. The method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor according to claim 1, characterized in that: The mounting box (5) is connected to the ring (1) by mounting buckle (4) on the ring (1).

7. The method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor according to claim 1, characterized in that: The bottom of the first main support plate (13), the second main support plate (18), the first side support plate (11) and the second side support plate (14) are all connected to a detachable lifting adjuster (15) mounted on a support base (19). Two limiting strips (21) are installed on the support base (19). The length direction of the limiting strips (21) is parallel to the vertical center plane that bisects the first main support plate (13) and the second main support plate (18). The two limiting strips (21) respectively clamp the lifting adjuster (15) located below the first main support plate (13) and the second main support plate (18) on both sides.

8. The method for horizontal installation of a large-scale nozzle in a dehydrogenation reactor according to claim 1, characterized in that: The drive mechanism includes a dual-axis motor (24) located in the middle, and a first lead screw (23) and a second lead screw (25) respectively connected to the two ends of the dual-axis motor (24). The ends of the first lead screw (23) and the second lead screw (25) facing away from the dual-axis motor (24) are connected to the main support plate through bearings. The threads of the first lead screw (23) and the second lead screw (25) have opposite directions. The first lead screw (23) and the second lead screw (25) are fitted with sliders (22). The sliders (22) are fixed with connecting blocks (26) that are fixedly connected to the push clamp plate (17). The surfaces of the first main support plate (13) and the second main support plate (18) are provided with strip grooves (16) for the connecting blocks (26) to pass through and move horizontally.

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