Horizontal installation method for large connecting pipe of dehydrogenation reactor

Abstract

The invention discloses a horizontal installation method for a large connecting pipe of a dehydrogenation reactor, and belongs to the technical field of dehydrogenation reactor manufacturing. Determining a reference point for mounting the supporting leg; supporting legs and a bottom plate are installed; determining a datum point for connecting pipe installation; aBC, EH and F connecting pipes are installed; and detecting the overall levelness, wherein the ABC connecting pipe, the EH connecting pipe and the F connecting pipe are assembled and installed on the cylinder body in the horizontal direction. The invention further provides hoisting and auxiliary equipment thereof, the hoisting and auxiliary equipment is used for carrying out connecting pipe hoisting and assembling work, and the equipment comprises a hoisting mechanism and a supporting mechanism. According to the method, a traditional method for vertically installing the connecting pipe is abandoned, the large connecting pipe is installed at the horizontal position, supporting tool materials can be saved, the assembling efficiency of the connecting pipe and the supporting legs is improved, the assembling precision is guaranteed, and measurement convenience and precision are promoted; and the position of the to-be-mounted connecting pipe can be quickly corrected through hoisting and auxiliary equipment thereof, so that the mounting of the large connecting pipe is facilitated.

Description

Technical Field

[0001] The invention mainly relates to the technical field of dehydrogenation reactor manufacturing, and in particular to a method for horizontally installing a large-scale pipe of a dehydrogenation reactor. Background Art

[0002] With the large-scale development trend of domestic equipment construction, the large-scale pressure vessel equipment is also developing rapidly. At the same time, in recent years, the traditional propylene production technology has reached a bottleneck due to the restriction of low propylene yield and cannot meet the growing domestic demand for propylene. New technologies such as propane dehydrogenation using the world's advanced Lummus process have become an important means of current propylene production. As the core equipment of the propane dehydrogenation unit, the quality and installation accuracy of the reactor are directly related to whether the unit can operate normally. The pipe structure of the dehydrogenation reactor is complex and belongs to a special-shaped part. At the same time, it is necessary to ensure that the bottom plate of the leg and the flange surface of the three large pipes are kept level, so the manufacturing accuracy of the reactor equipment is extremely high.

[0003] The structure of the dehydrogenation reactor equipment is as follows Figure 1 As shown in the figure, during the manufacturing process, since the ABC pipes of the equipment extend to a height of 8.25 meters, and the EH and F pipes extend to a height of 4.6 meters, if the traditional vertical pipe installation method is adopted, a basic platform needs to be made to raise the roller frame by more than 5.1 meters. This not only requires a large amount of tooling material costs, but also the height of the ABC pipes will reach about 17 meters when they are installed, which will greatly reduce the installation efficiency, bring great difficulties to the measurement, and there are great safety hazards during the construction process. Summary of the invention

[0004] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. It mainly provides a horizontal installation method for large-scale pipes of dehydrogenation reactors, which is used to solve the technical problems of low installation efficiency and great safety hazards of the traditional vertical installation method of pipes proposed in the above background technology.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: A method for horizontally installing a large-scale pipe of a dehydrogenation reactor comprises the following steps: S1. Determine the reference points for dividing the cylinder into four equal parts: determine the four-division lines of 0°, 90°, 180°, and 270°; S2. Determine the reference point for the installation of the outriggers: first convert the vertical distance from the outrigger base plate to the reference point at the bottom of the cylinder, and then set up a virtual reference point at the same point in the vertical direction of each reference point based on the cylinder reference point; S3. Install the legs and the bottom plate: first install the four legs and the bottom plate in sequence according to the drawings; then use the theodolite to measure the distance from the virtual reference point to the busbar at the bottom of the cylinder, and the distance from the virtual reference point to the lower surface of the leg bottom plate for calibration; S4. Determine the reference point for pipe installation: rotate the cylinder 90 degrees; S5, ABC, EH, F pipe installation: ABC, EH, F pipes are installed horizontally with the cylinder; S6. Overall levelness detection.

[0006] Furthermore, in step S3, after measuring the distance using the theodolite, the support plate is fine-tuned to a 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, the height difference between the two ends of the 0°-0° generatrix of the cylinder is measured by a theodolite, and the inclination of the axis direction is calculated.

[0008] Further, in step S5, when installing the E / H pipe, the pipe hoisting assembly is aligned: the four-equal lines of the end of the pipe E cylinder body are aligned with the four-equal lines of the cylinder opening, installed, and initially fixed; then the relative elevations of the outer span center lines of the E and H flanges are measured by the theodolite, and the corresponding slopes are calculated to be consistent with the slopes in the direction of the cylinder axis, otherwise fine-tuning is performed until they are the same; When installing the ABC pipe, the pipe hoisting group is aligned: the four-equal lines at the end of the pipe cylinder are aligned with the four-equal lines at the cylinder opening, installed and initially fixed; then the relative elevation of the center line of the outer span of the B and C flanges is measured with a theodolite, and the corresponding slope is calculated to be consistent with the slope in the direction of the cylinder axis, otherwise fine-tuning is performed until they are the same.

[0009] As an improvement to the above scheme, in step S5, when the pipe is hoisted and assembled, a hoisting and auxiliary equipment are used. The structure of the hoisting and auxiliary equipment is as follows: it includes a hoisting mechanism for hoisting the pipe and a supporting mechanism for limiting the pipe. The hoisting mechanism includes a torus, a general hoisting rope, four installation boxes and four branch hoisting ropes. The general hoisting rope is located on the central axis of the torus. The four installation boxes are installed on the torus at equal intervals. Each installation box leads to a branch hoisting rope. The installation box is provided with a wire drum for reeling in and out the branch hoisting rope and a driving motor for driving the wire drum to rotate. The supporting mechanism includes a supporting seat, 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 plates and a driving mechanism for driving the push plates to move are installed on the first main support plate and the second main support plate. The driving mechanism is located inside the main support plate.

[0010] Furthermore, a cross connecting rod is connected to the inner side of the annular body, and the lower end of the total lifting rope is connected to the center of the cross connecting rod.

[0011] Preferably, a cross connecting rod is connected to the inner side of the annular body, the branched part of the lower end of the total lifting rope is connected to the center of the cross connecting rod, and the remaining part of the lower end of the total lifting rope is connected to the circumferential side of the annular body at equal intervals.

[0012] Furthermore, the installation box is connected to the annular body by being mounted on the annular body through an installation buckle ring.

[0013] Further optimization, the bottoms of the first main support plate, the second main support plate, the first side support plate and the second side support plate are all connected with a lifting adjuster detachably mounted on the support seat, and two limit bars are installed on the support seat, and the length direction of the limit bars is parallel to the vertical center plane that divides the first main support plate and the second main support plate in half, and the two limit bars are respectively clamped on both sides of the lifting adjuster below the first main support plate and the second main support plate.

[0014] Furthermore, the driving mechanism includes a dual-axis motor located in the middle, and a first lead screw and a second lead screw respectively connected to the two end sides 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 connected to the main support plate through bearings, the thread rotation directions of the first lead screw and the second lead screw are opposite, the first lead screw and the second lead screw are adaptively provided with sliders, the sliders are fixed with connecting blocks fixedly connected to the push clamping plate, and the surfaces of the first main support plate and the second main support plate are provided with strip-shaped sliding grooves for the connecting blocks to pass through and translate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention abandons the traditional vertical installation method of the pipe and adopts the horizontal installation of the large pipe, which can bring the following benefits: ① Save supporting tooling materials: If the traditional vertical assembly method is used, due to the influence of the height of the pipe extension, the eight reactors will have to take tooling platform measures to raise the equipment to more than 5.1 meters. The horizontal assembly method does not need to raise the reactor, which reduces cost investment and avoids safety risks.

[0016] ② Improve the efficiency of pipe and leg assembly: adopt the horizontal assembly method, and the height of the pipe assembly operation platform is only 5 meters, which greatly facilitates the pipe assembly work and measurement and shortens the pipe assembly time.

[0017] ③ Ensure assembly accuracy: The horizontal assembly method is adopted to save construction measures and safety measures, while ensuring the installation accuracy of each large pipe and leg. The axial spacing of the four legs is 9182mm, the radial spacing is 8550mm, and the horizontality of the bottom plates of the four legs is required to be ±3mm. This method is used to control the horizontality within ±1.5mm, ensuring the stability and safety performance of the reactor under harsh operating conditions.

[0018] ④ Convenient and accurate measurement: The horizontal pairing method is adopted to ensure the measurement during the pairing process, the real-time control during the welding process, and the inspection after the welding is completed. The measurement benchmark selection and operation can be carried out on the ground, which is relatively simple and easy to control.

[0019] When determining the reference point for installing the outrigger, the present invention sets up a virtual reference point at the same equal height point in the vertical direction of each reference point based on the reference point of the cylinder, which can solve the problem that the theodolite measurement technology cannot directly measure the reference point on the surface of the aiming cylinder, and provides convenience for determining the reference point for installing the outrigger; when installing the outrigger and the bottom plate, the 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 bottom plate of the outrigger, so as to facilitate calibration, and the construction is more convenient. In the optimized scheme of the present invention, a hoisting mechanism and a supporting mechanism are provided. When the pipe is hoisted and assembled, each end of the pipe is hoisted by a separate hoisting rope. During the lowering process, the offset of the pipe in the horizontal plane can be corrected by first moving the push-up clamps on the two main support plates closer to each other. Then, it is determined by whether the pressure sensors on the main support plate and the side support plate are triggered at the same time to determine whether the end of the pipe is offset in the height direction. If some sensors should be triggered but are not triggered, indicating that the corresponding end of the pipe is too high, the corresponding separate hoisting rope is controlled to be lowered until all the used pressure sensors are triggered, so as to achieve the correction of the height direction of the pipe and finally make the pipe accurately located at the target position. The present invention also optimizes the supporting mechanism so that the position and height of the main support plate and the side support plate are adjustable, so that the hoisting and its auxiliary equipment can be suitable for the hoisting groups 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the dehydrogenation reactor in the present invention; Figure 2It is a process flow chart of the present invention; Figure 3 It is a schematic diagram of reference points for dividing the cylinder of the dehydrogenation reactor into four equal parts in the embodiment; Figure 4 A schematic diagram of reference points for mounting the supporting legs in the embodiment; Figure 5 A schematic diagram of reference points for pipe installation in the embodiment; Figure 6 It is a structural schematic diagram of the lifting device and its auxiliary equipment for pipe installation in the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the lifting mechanism in the present invention; Figure 8 It is a schematic diagram of the internal structure of the installation box in the lifting mechanism; Fig. 9 It is a schematic diagram of the three-dimensional structure of the support mechanism in the present invention; Fig.10 Schematic diagram of the internal structure of the main support plate in the support mechanism.

[0021] Reference numerals: 1. Ring body; 2. Cross connecting rod; 3. Main lifting rope; 4. Mounting buckle; 5. Mounting box; 6. Branch lifting rope; 7. Driving motor; 8. Wire drum; 10. Lifting mechanism; 11. First side support plate; 12. Pressure sensor; 13. First main support plate; 14. Second side support plate; 15. Lifting regulator; 16. Strip slide; 17. Push splint; 18. Second main support plate; 19. Support seat; 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 DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0023] Example 1: Please refer to the attached Figure 2 , a method for horizontally installing a large-scale pipe of a dehydrogenation reactor, comprising the following steps: S1. Determine the reference points for dividing the cylinder into four equal parts like Figure 3As shown, firstly, the circumferential direction of the two ends of the cylinder is divided into four equal parts (0°, 90°, 180°, 270°), and the plumb line is used to align the 0°, 180° and 90°, 270° directions of the two ends of the cylinder. Then, the theodolite is used to measure whether the four points corresponding to 90° and 270° at the two ends of the cylinder are in the same horizontal plane, and they are adjusted to determine these four points as the reference points.

[0024] S2. Determine the reference point for outrigger installation 1. Calculate the vertical distance h1 from the outrigger base plate to the 180° reference point according to the drawing, such as Figure 4 As shown; 2. Since theodolite measurement technology cannot directly measure the reference point on the surface of the aiming cylinder, a virtual reference point is set up at the same equal height point h2 in the vertical direction of each reference point based on the cylinder reference point, such as Figure 4 shown.

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

[0026] 2. Use the theodolite to measure the distance from the virtual reference point to the 180° busbar, and measure the distance from the virtual reference point of the theodolite to the lower surface of the leg bottom plate. Then use the bolt fine-tuning tool to fine-tune the support plate to the standard size, and tighten the bolt tool to fix the bottom plate to prevent welding deformation.

[0027] S4. Determine the reference point for pipe installation After the legs are installed, rotate the cylinder 90 degrees so that 0° and 180° are in horizontal positions. 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 the inclination of its axis direction.

[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 included angle of 25.9° in the axial direction, for the convenience of installation and measurement, the relative elevation difference between the pipe openings E and H in the vertical direction is calculated before installation.

[0029] (2) Pipe hoisting assembly: Align and install the pipe E cylinder end quarter line corresponding to the cylinder opening quarter line, and make preliminary fixation. Then use the theodolite to measure the relative elevation of the E and H flange outer span center line, and calculate the corresponding slope to keep it consistent with the cylinder axis direction slope, otherwise make fine adjustments until they are the same.

[0030] (3) Make welding connections.

[0031] 2.F pipe installation Pipe hoisting assembly: Align and install the pipe F cylinder end quarter line corresponding to the cylinder opening quarter line, and do preliminary fixation. Then use the theodolite to measure and calibrate. Finally, weld and connect.

[0032] 3.ABC takes over the installation (1) Before hoisting the ABC pipe, first mark and align the three flange surfaces A, B, and C with the end of the pipe barrel, determine the mid-span lines of the three flange surfaces and the four-equal lines of the end of the pipe barrel, and make marks at the corresponding positions.

[0033] (2) Pipe connection hoisting assembly: Align and install the pipe connection cylinder end quarter line corresponding to the cylinder opening quarter line, and make preliminary fixation. Then use the theodolite to measure the relative elevation of the outer span center line of flange B and flange C, and calculate the corresponding slope to keep it consistent with the slope of the cylinder axis direction, otherwise make fine adjustments until they are the same.

[0034] (3) Make welding connections.

[0035] S6. Overall levelness detection Check the distance from each pipe nozzle flange to the equipment at 90° and the distance from each pipe nozzle flange to the equipment at 270°, and fine-tune each pipe nozzle flange to make the distance from each pipe nozzle flange to the equipment at 90° equal to the distance to the equipment at 270°.

[0036] Embodiment 2: This embodiment differs from Embodiment 1 in that: In step S5, when the pipe is hoisted and assembled, the following method is used: Figure 6 The hoisting and auxiliary equipment shown are carried out, and the structure of the equipment is: like Figure 6 As shown, it includes a hoisting mechanism for hoisting the pipe and a supporting mechanism 20 for limiting the position of the pipe; like Figure 7 As shown, the hoisting mechanism 10 includes a torus 1, a general hoisting rope 3, four installation boxes 5 and four branch hoisting ropes 6, the general hoisting rope 3 is located on the central axis of the torus 1, a cross connecting rod 2 is connected to the inner side of the torus 1, and the lower end of the general hoisting rope 3 is connected to the center of the cross connecting rod 2; the four installation boxes 5 are installed on the torus 1 at equal intervals, and the installation boxes 5 are mounted on the torus 1 through the installation buckle 4 to realize the connection with the torus 1; as shown Figure 8 As shown, each installation box 5 leads out a branch suspension rope 6, and a wire drum 8 for reeling in and out the branch suspension rope 6 and a driving motor 7 for driving the wire drum 8 to rotate forward and reverse are arranged in the installation box 5; like Fig. 9As shown, the support mechanism 20 includes a support seat 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, and the upper end 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 all embedded with pressure sensors 12, and the first main support plate 13 and the second main support plate 18 are both installed with a pair of push clamps 17 and a driving mechanism for driving the push clamps 17 to move, and the driving mechanism is located inside the main support plate, and the surfaces of the first main support plate 13 and the second main support plate 18 are provided with strip-shaped slide grooves 16 for the connection blocks 26 to pass through and translate; as shown Fig.10 As shown, the driving 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 end sides of the dual-axis motor 24, the first lead screw 23 and the second lead screw 25 are connected to the main support plate at one end facing away from the dual-axis motor 24 through a bearing, the first lead screw 23 and the second lead screw 25 have opposite thread rotation directions, and a slider 22 is adaptively mounted on the first lead screw 23 and the second lead screw 25, and a connecting block 26 fixedly connected to the push clamp plate 17 is fixed on the slider 22.

[0037] When installing the ABC pipe, four branch lifting ropes 6 are tied to the two ends of the A pipe, the end where the pipe mouth flange of the B pipe is located, and the end where the pipe mouth flange of the C pipe is located, and then lifted by the main lifting rope 3; at the same time, the position of the support seat 19 is adjusted so that the vertical center plane that divides the first main support plate 13 and the second main support plate 18 is aligned with the vertical center line of the connecting port on the reactor cylinder; and the upper end 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 height corresponding to the bottom of the corresponding position of the ABC pipe after it is installed on the reactor cylinder (obtained by pre-measurement and calculation); then the ABC pipe to be installed is hoisted and lowered to the location of the support mechanism 20. During the hoisting and lowering process, the ABC pipe may be offset in the horizontal plane, the end of the A pipe may be offset in the longitudinal direction, the B pipe may be too low or too high, and the C pipe may be too low or too high, and the hoisting mechanism 10 and the support mechanism 20 are used to correct the deviation: First, in order to solve the problem of the ABC pipe being offset 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 approach each other to clamp the A pipe so that the axis of the A pipe is located on the vertical center plane that divides the first main support plate 13 and the second main support plate 18 in half, thereby correcting the offset of the ABC pipe in the horizontal plane; Secondly, as for the problem of the displacement of pipe A in the longitudinal direction, during the lifting and lowering process 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 the two main support plates should be triggered at the same time; when the pressure sensor 12 on one of the main support plates is triggered and the other is not triggered, it means that the end of pipe A has shifted in the longitudinal direction. At this time, the sub-lifting rope 6 corresponding to the pressure sensor 12 that should be triggered but has not been triggered is controlled to be lowered until the corresponding pressure sensor 12 is triggered. At this time, the two ends of pipe A are respectively in contact with the first main support plate 13 and the second main support plate 18, so as to realize the correction of the displacement of pipe A in the longitudinal direction.

[0038] Finally, for the problem that tube B is too low (tube C is too high) or tube B is too high (tube C is too low), during the lifting and lowering process of the ABC pipe, since the height difference between the first side support plate 11 and the second side support plate 14 has been determined, if tube B and tube C are not offset, the pressure sensors 12 on the two side support plates should be triggered at the same time; when the pressure sensor 12 on one of the side support plates is triggered and the other is not triggered, it means that tube A has been deflected. At this time, the sub-lifting rope 6 corresponding to the pressure sensor 12 that should be triggered but has not been triggered is controlled to be lowered until the corresponding pressure sensor 12 is triggered. At this time, tube B and tube C are in contact with the first side support plate 11 and the second side support plate 14 respectively, so as to correct the offset of tube B and tube C.

[0039] Combining the above three correction schemes, the deviation correction and position limiting of the ABC pipe are completed, and finally the ABC pipe is maintained in the target state and aligned with the corresponding connecting port on the reactor cylinder. After the assembly welding is completed, the lifting mechanism is disassembled.

[0040] The rest is the same as the first embodiment.

[0041] Embodiment 3: This embodiment differs from Embodiment 2 in that: like Figure 7 As shown, a cross link 2 is connected to the inner side of the annular body 1, a portion of the lower end of the main hoisting rope 3 is connected to the center of the cross link 2, and the remaining portion of the lower end of the main hoisting 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 hoisting of the main hoisting rope 3, and lay a good foundation for the hoisting of the branch hoisting rope 6.

[0042] like Fig. 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 with a lifting regulator 15 detachably mounted on a support seat 19 to achieve position adjustment and height adjustment of each support plate; two limit bars 21 are installed on the support seat 19, and the length direction of the limit bars 21 is parallel to the vertical center plane that divides the first main support plate 13 and the second main support plate 18 in half, and the two limit bars 21 are respectively clamped on both sides of the lifting regulator 15 below the first main support plate 13 and the second main support plate 18, so that the two main support plates are always kept on the same axis. This arrangement enables the hoisting and its auxiliary equipment to be suitable for the hoisting groups of ABC pipes, E / H pipes, and F pipes.

[0043] When installing the E / H pipe, only three branch lifting ropes 6, two main support plates and one side support plate are used; first, the E / H pipe is corrected in the horizontal direction in the same way as the horizontal correction process of the A pipe in the first step of the second embodiment, and then the branch lifting rope 6 at the higher end is controlled to be lowered through the cooperation of the pressure sensor 12 to realize the correction of the E / H pipe in the height direction.

[0044] When installing the F pipe, only two branch suspension ropes 6 and two main support plates are used; first, the F pipe is corrected in the horizontal direction by the horizontal correction process of the A pipe in the first step of the second embodiment, and then the F pipe is corrected in the height direction by the height correction process of the A pipe in the second step.

[0045] The rest is the same as the second embodiment.

[0046] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for horizontally installing a large-scale pipe of a dehydrogenation reactor, characterized in that: The steps include: S1. Determine the reference points for dividing the cylinder into four equal parts: determine the four-division lines of 0°, 90°, 180°, and 270°; S2. Determine the reference point for the leg installation: first convert the vertical distance from the leg bottom plate to the reference point at the bottom of the cylinder, and then set up a virtual reference point at the same point in the vertical direction of each reference point based on the cylinder reference point; S3. Install the legs and the bottom plate: first install the four legs and the bottom plate in sequence according to the drawings; then use the theodolite to measure the distance from the virtual reference point to the busbar at the bottom of the cylinder, and the distance from the virtual reference point to the lower surface of the leg bottom plate for calibration; S4. Determine the reference point for pipe installation: rotate the cylinder 90 degrees; S5, ABC, EH, F pipe installation: ABC, EH, F pipes are installed horizontally with the cylinder; S6. Overall levelness detection.

2. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 1, characterized in that: In step S3, after measuring the distance using the theodolite, the support plate is fine-tuned 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.

3. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 1, characterized in that: In step S4, the height difference between the two ends of the 0°-0° generatrix of the cylinder is measured by a theodolite, and the inclination of the axis direction is calculated.

4. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 1, characterized in that: In step S5, when installing the E / H pipe, the pipe hoisting assembly is aligned: the four-equal lines at the end of the pipe E cylinder body are aligned with the four-equal lines at the cylinder opening, installed, and initially fixed; then the relative elevations of the outer span center lines of the E and H flanges are measured by the theodolite, and the corresponding slopes are calculated to be consistent with the slopes in the direction of the cylinder axis, otherwise fine-tuning is performed until they are the same; When installing the ABC pipe, the pipe hoisting group is aligned: the four-equal lines at the end of the pipe cylinder are aligned with the four-equal lines at the cylinder opening, installed and initially fixed; then the relative elevation of the center line of the outer span of the B and C flanges is measured with a theodolite, and the corresponding slope is calculated to be consistent with the slope in the direction of the cylinder axis, otherwise fine-tuning is performed until they are the same.

5. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 1, characterized in that: In step S5, when the pipe is hoisted and assembled, 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 supporting mechanism (20) for limiting the position of the pipe. The hoisting mechanism (10) includes a circular ring (1), a general hoisting rope (3), four installation boxes (5) and four branch hoisting ropes (6). The general hoisting rope (3) is located on the central axis of the circular ring (1). The four installation boxes (5) are installed on the circular ring (1) at equal intervals. Each installation box (5) leads out a branch hoisting rope (6). The installation box (5) is provided with a wire drum (8) for reeling in and unreeling the branch hoisting rope (6) and a driving motor (7) for driving the wire drum (8) to rotate. The support mechanism (20) comprises a support seat (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 end 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 driving 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 driving mechanism is located inside the main support plate.

6. A method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 5, characterized in that: A cross connecting rod (2) is connected to the inner side of the annular body (1), and the lower end of the total lifting rope (3) is connected to the center of the cross connecting rod (2).

7. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 5, characterized in that: A cross connecting rod (2) is connected to the inner side of the annular body (1), a portion of the lower end of the total lifting rope (3) is connected to the center of the cross connecting rod (2), and the remaining portion of the lower end of the total lifting rope (3) is connected to the circumferential side of the annular body (1) at equal intervals.

8. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 5, characterized in that: The installation box (5) is mounted on the annular body (1) via the installation buckle ring (4) to achieve connection with the annular body (1).

9. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 5, characterized in that: 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 with a lifting regulator (15) detachably mounted on a support seat (19); two limit bars (21) are mounted on the support seat (19); the length direction of the limit bars (21) is parallel to a vertical center plane bisecting the first main support plate (13) and the second main support plate (18); and the two limit bars (21) are respectively clamped on both sides of the lifting regulator (15) below the first main support plate (13) and the second main support plate (18).

10. The method for horizontally installing a large-scale pipe of a dehydrogenation reactor according to claim 5, characterized in that: The driving mechanism comprises 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 end sides 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 first lead screw (23) and the second lead screw (25) have opposite thread rotation directions; the first lead screw (23) and the second lead screw (25) are adaptively mounted with a slider (22); a connecting block (26) fixedly connected to the push clamp (17) is fixed on the slider (22); and a strip-shaped slide groove (16) for the connecting block (26) to pass through and translate is provided on the surface of the first main support plate (13) and the second main support plate (18).

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