Segmented installation construction method for skid-mounted cold box

Abstract

The invention provides a skid-mounted cold box segmented installation construction method. The skid-mounted cold box segmented installation construction method comprises the steps of deepening design, cold box segmented frame manufacturing, modular cold box manufacturing, welding detection and pressure testing, modular cold box transportation, cold box foundation construction, modular cold box on-site assembly and temporary operation platform dismantling. Testing and purging the system; and carrying out bare cooling and pearlife filling. The cold box is segmented and horizontally assembled in a factory to form the modularized cold box, and then the modularized cold box is transported to a construction site for segmented assembly, so that compared with the whole skid-mounted cold box, the weight is light, the requirements for transportation and hoisting are reduced, and compared with the traditional on-site assembly, the occupied field space is small, and the requirements for the field are reduced; the transportation and construction cost is saved, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cold box installation, and in particular relates to a segmented installation construction method for a skid-mounted cold box. Background Art

[0002] With the continuous updating of air separation engineering processes and equipment, air separation units are gradually tending towards large-scale, modular, and clustered, and require short-cycle and rapid construction and commissioning. The overall skid-mounted technology of cold boxes has emerged. The overall skid-mounted technology used in the existing technology is to assemble all the equipment, pipelines, cables and instrument components in the cold box at the manufacturer to form an overall structure and transport it to the construction site. After hoisting and adjustment, the reserved pipe openings on all sides are welded to the on-site pipe openings. Although this method has the advantages of being simple and easy to operate, reducing high-altitude operations, easy to control assembly quality and high construction efficiency, the weight of the overall skid-mounted cold box usually reaches 200-600t, the height can usually reach 20-70m, and the length and width can usually reach 4-10m. Its overweight, overheight and oversize characteristics have high requirements for transportation, hoisting machinery, construction site space and road traffic, and require a lot of manpower and material resources. In addition, some construction sites cannot meet the requirements of its overall hoisting. Therefore, it is necessary to develop a skid-mounted cold box segmented installation construction method to reduce the difficulty of transportation and lifting of the cold box and the requirements for the construction site. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a skid-mounted cold box segmented installation construction method, which occupies a small site space, reduces the requirements for transportation and lifting equipment, is efficient and convenient, and has high installation precision.

[0004] The technical solution adopted in the present invention is:

[0005] A skid-mounted cold box segmented installation construction method comprises the following steps:

[0006] Deepening design: Divide the cold box into sections based on its dimensions, weight, height, number and location of towers inside the cold box, determine the section locations, and conduct BIM simulation and mechanical analysis on the routing and form of the bridges for the pipes, containers, positioning brackets, and electrical and instrumentation lines inside the cold box;

[0007] Making a cold box segmented frame: setting a connecting flange at the interface of two adjacent cold box segmented frames, and setting a full-length ladder inside the cold box segmented frame;

[0008] Manufacturing the modular cold box: performing horizontal installation in a factory, including installing the positioning brackets in the assembled cold box segmented frame, and then installing the containers, the pipes and cold box accessories to form the modular cold box;

[0009] Welding inspection and pressure test: non-destructive inspection of the welds in the process of manufacturing the modular cold box and gas pressure test;

[0010] Transporting the modular cold box: Before transporting the modular cold box, remove the valve assembly and safety valve pipeline outside the modular cold box, and seal the reserved pipe opening;

[0011] Cold box foundation construction: install anchor bolts and reserved steel plates, and pour foundation concrete to the same height as the top surface of the reserved steel plates;

[0012] Assemble the modular cold box on site: weld the column base plate of the bottom section modular cold box to the reserved steel plate, and then install the modular cold box section by section from bottom to top; before the boxes of the upper section modular cold box are connected in pairs, set up a temporary working platform using the full-length ladder inside the modular cold box, and use the temporary working platform to connect the boxes and containers of the upper section modular cold box in pairs;

[0013] dismantling the temporary working platform;

[0014] System testing and purging;

[0015] Bare cold and pearl sand filling.

[0016] Furthermore, the segmented position is the connection position between the upper tower and the main condenser evaporator, and the tops of the four inner skeleton columns of the cold box segmented frame where the container is to be installed are provided with lifting ears.

[0017] Furthermore, the positioning brackets include permanent brackets and temporary brackets.

[0018] Furthermore, the temporary operating platform is located at the segmented connection between the upper and lower sections of the modular cold box.

[0019] Furthermore, a special sling is used to lift each section of the modular cold box, and the special sling includes a fixed bracket and a sliding bracket slidably connected to the fixed bracket. A fall chain assembly is provided at one end of the fixed bracket, and the fall chain assembly is connected to the sliding bracket for driving the sliding bracket to move along the length direction of the fixed bracket.

[0020] Furthermore, after the boxes of each section of the modular cold box are connected in pairs, the boxes and pipelines around the modular cold box are connected in pairs.

[0021] Furthermore, the stepwise installation of the modular cold box from bottom to top includes:

[0022] Use high-strength bolts to connect and fix the box body of the lower modular cold box with the box body of the upper modular cold box;

[0023] Carry out the container pair connection, pipe docking installation, and connection part bracket installation in sequence;

[0024] Equipment and pipeline pressure testing;

[0025] Welding the connecting flanges of the lower modular cold box and the upper modular cold box;

[0026] Install cables, bridges and instrumentation inside the modular cold box.

[0027] Furthermore, the pair connection of the containers includes detecting the verticality of the containers, including setting two sets of upper and lower adjustable brackets in four directions of the outer wall of the container, setting sensors on the adjustable brackets, and detecting the laser position on the sensor by a laser collimator.

[0028] Furthermore, the sensor is a wireless laser measurement target, comprising an optical sensor, a connecting rod and a control module. The connecting rod is provided with a scale and can be rotated under the drive of the control module to adjust the angle of the optical sensor.

[0029] Furthermore, before dismantling the temporary working platform, the temporary support and temporary pipe section are dismantled on the temporary working platform through the full-length ladder.

[0030] The advantages and positive effects of the present invention are:

[0031] (1) The cold box is divided into sections and assembled horizontally in the factory to form a modular cold box. The modular cold box is then transported to the construction site for section assembly. Compared with the overall skid-mounted cold box, the weight is lighter, which reduces the requirements for transportation and lifting. Compared with traditional on-site assembly, the space occupied by the site is smaller, which reduces the requirements for the site, saves transportation and construction costs, and improves construction efficiency.

[0032] (2) During the on-site assembly of the modular cold box, the modular cold box body is first connected and fixed, and then the internal containers and pipes are connected in pairs, which saves the hoisting operation time and improves the construction safety;

[0033] (3) By setting up a temporary working platform at the segmented connection between the upper and lower modular cold boxes, it is avoided to set up a working platform within the height range from the bottom to the top of the cold box, which reduces the working time of personnel and the amount of materials used, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the connection between the upper cold box frame and the lower cold box frame in a specific embodiment of the present invention;

[0035] Figure 2 This is a schematic structural diagram of a cold box foundation in a specific embodiment of the present invention;

[0036] Figure 3 It is a structural schematic diagram of a special spreader in a specific embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of the position of a temporary work platform in a specific embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of container verticality detection in a specific embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of a wireless laser measurement target in a specific embodiment of the present invention;

[0040] Figure 7 It is a structural schematic diagram of an adjustable bracket in a specific embodiment of the present invention.

[0041] In the picture:

[0042] 1. Upper cold box frame; 2. Lower cold box frame; 3. Connecting flange; 4. Positioning block; 5. Cold box foundation; 6. Anchor bolts; 7. Reserved steel plate; 8. Column base plate; 9. Fixed bracket; 10. Sliding bracket; 11. Falling chain assembly; 12. Positioning ring; 13. Modular cold box; 14. Container; 15. Full-length ladder; 16. Temporary working platform; 17. Wireless laser measurement target; 18. Laser path; 19. Laser collimator; 20. Optical sensor; 21. Connecting rod; 22. Control module; 23. Adjustable bracket; 231. Fixed bracket; 242. Connecting bracket. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0044] like Figures 1 to 7 As shown, the present invention proposes a segmented installation construction method for a skid-mounted cold box, which is particularly suitable for the installation of large skid-mounted cold boxes. Compared with the overall skid-mounted technology used in the prior art, it occupies less site space and reduces the requirements for transportation and lifting equipment. It is efficient, convenient, and has high installation precision.

[0045] The method specifically comprises the following steps:

[0046] S1. Deepen the design;

[0047] An analysis was conducted based on the project design documents and the functional role of the cold box. A three-dimensional model was created using BIM technology. The cold box was then segmented based on its overall dimensions, weight, height, number of towers in the cold box, and position. The technical parameters of the main tower were considered as the key factors to determine the segment positions. BIM simulation and mechanical analysis were then performed on the laying paths and forms of the bridges for the pipes, containers 14, positioning brackets, and electrical and instrumentation lines in each segmented cold box based on the segment positions, ensuring optimal operating conditions for the segmented cold boxes.

[0048] Furthermore, the segmentation of cold boxes must fully consider the needs of segmented transportation and on-site assembly. It must not only meet the conditions for factory transportation, have a transportation load that meets the requirements, and reduce the difficulty of transportation; it must also meet the conditions for on-site installation operations, reduce the investment in redundant measures, and improve construction efficiency.

[0049] Preferably, the segmented position of the cold box is the connection position between the upper tower and the main condenser evaporator.

[0050] S2, making cold box segmented frames;

[0051] The method includes setting a connecting flange 3 at the interface of two adjacent cold box segmented frames, setting a full-length ladder 15 on the inner side of the cold box segmented frame, and setting a lifting lug on the outer side of the cold box segmented frame.

[0052] In a specific embodiment, Figure 1 As shown, the cold box is divided into an upper cold box and a lower cold box, which are respectively manufactured in the factory to form an upper cold box frame 1 and a lower cold box frame 2; the connecting flange 3 is made of square steel and is matched and arranged at the bottom of the upper cold box frame 1 and the top of the lower cold box frame 2; the connecting surfaces of the two connecting flanges 3 are provided with a plurality of matching connecting holes, so that the upper cold box frame 1 and the lower cold box frame 2 can be positioned and connected by high-strength bolts during subsequent construction to ensure that the two can be connected in pairs;

[0053] Preferably, if Figure 1 As shown, in the above embodiment, when the lower cold box frame 2 is manufactured in the factory, vertical positioning blocks 4 are provided on the inner walls on both sides of the corners of the connecting flange 3 at the top of the lower cold box frame 2, so that the upper cold box frame 1 and the lower cold box frame 2 can be accurately positioned during assembly, saving the assembly time of the upper cold box frame 1 and the lower cold box frame 2 and improving the operating safety of the operators.

[0054] In the above embodiment, a full-length ladder 15 is provided at the same relative position of the upper cold box frame 1 and the lower cold box frame 2. The full-length ladder 15 is arranged along the height direction of the upper cold box frame 1 and the lower cold box frame 2, and can be spliced into a whole after the upper cold box frame 1 and the lower cold box frame 2 are paired and connected. The operator performs installation operations inside the cold box through the full-length ladder 15 provided in the cold box, which improves the safety of the operation and saves labor and material costs compared to the practice of erecting a full-length scaffolding outside the cold box.

[0055] In a specific embodiment, lifting ears are provided on the outside of the cold box segmented frame to facilitate subsequent lifting operations; at the same time, lifting ears are also provided on the tops of the four inner skeleton columns of the cold box segmented frame where the container is to be installed, which are used to temporarily fix the container 14 in the cold box segmented frame.

[0056] S3, making a modular cold box 13;

[0057] After the cold box segmented frames are manufactured, it is necessary to install the equipment and piping inside the segmented frames to form a modular cold box 13;

[0058] Specifically, the modular cold box 13 is horizontally installed in the factory, including installing positioning brackets in the assembled cold box segment frame, and then installing the container 14, pipelines and cold box accessories to form the modular cold box 13;

[0059] Among them, the positioning brackets include permanent brackets and temporary brackets. The permanent brackets are necessary brackets for fixing and supporting equipment and pipelines and controlling pipeline displacement and deformation when the cold box is in operation; the temporary brackets are newly added brackets for the temporary fixation and transportation of equipment and pipelines in the cold box, and need to be removed after the on-site assembly of the cold box is completed. Preferably, the temporary brackets are marked with special colors.

[0060] Furthermore, after the assembly of the container 14 and the pipeline is completed, the container 14 is temporarily fixed to the lifting lugs on the inner side of the cold box segmented frame by a fall chain to ensure that the container 14 does not move back and forth during transportation, does not shift up and down during the lifting of the modular cold box 13, and prevents the pipeline in the cold box from being deformed during lifting; at the same time, it is convenient to fine-tune the pairing gap between the upper and lower containers when pairing the containers 14 in the cold box later, to ensure the pairing gap width of the interface and control the welding quality.

[0061] Furthermore, before installing the equipment and pipelines in the box, the equipment and pipeline materials must be degreased and deoiled. After the internal cleanliness inspection is passed, they must be sealed in time before the next construction process can be carried out.

[0062] Furthermore, the installation of cold box accessories includes installing cables, cable trays and instrument panel accessories inside the cold box according to the drawings. After installation, the cable trays, instrument panel accessories, etc. are also reinforced with temporary brackets.

[0063] Furthermore, after the modular cold box 13 is manufactured, a spherical cap head is used to seal the reserved connection ports of the container 14 and the pipeline to ensure its cleanliness during transportation and lifting.

[0064] S4, welding inspection and pressure test;

[0065] This includes non-destructive testing of welds during the manufacture of the modular cold box 13 and gas pressure testing;

[0066] Specifically, 100% non-destructive testing is performed on the welds. After passing the test, a gas pressure test is carried out according to the system pressure level. The test medium is dry, clean, oil-free air. The product can only be shipped out of the factory when all pressure values meet the design requirements.

[0067] S5. Transporting the modular cold box 13: Before transporting the modular cold box 13, remove the valve assembly and safety valve pipeline outside the modular cold box 13, and seal the reserved pipe opening;

[0068] Furthermore, before transporting the modular cold box 13, all pipe racks and valve racks inside the cold box need to be fastened; blind plates are used to seal the reserved pipe openings; and low-pressure nitrogen is filled on the equipment and pipelines inside the cold box for protection.

[0069] S6, cold box foundation 5 construction;

[0070] In this embodiment, the construction of the cold box foundation 5 only needs to be completed before the modular cold box 13 is transported to the construction site. There is no limit on the specific start time of the construction. It can be carried out after the cold box segmented frame is completed in step S2, or it can be carried out simultaneously with the production of the modular cold box 13 in step S3.

[0071] Furthermore, if Figure 2 As shown, during the foundation construction, the size of the foundation is designed according to the size and installation position of the bottom modular cold box 13, and the anchor bolts 6 are installed at the corresponding position of the column base plate 8 of the bottom modular cold box 13, and the reserved steel plate 7 is installed and tightened by the anchor bolts 6 to ensure that the reserved steel plate 7 is level, and then the foundation concrete is poured to the same height as the top surface of the reserved steel plate 7; the above-mentioned reserved steel plate 7 is used to be aligned with the column base plate 8 of the bottom modular cold box 13, and is connected by welding. Compared with directly connecting and fixing the column base plate 8 by the anchor bolts 6, the relative position of the column base plate 8 and the reserved steel plate 7 can be adjusted more conveniently, while ensuring the installation accuracy of the bottom modular cold box 13, the requirements for the positioning accuracy of the anchor bolts are reduced, saving the adjustment time of the hoisting and positioning of the modular cold box 13, reducing the process of adjusting the column base plate shim and the secondary grouting of the foundation, saving installation operation costs, and improving construction operation efficiency.

[0072] S7, on-site assembly of modular cold box 13;

[0073] The column base plate 8 of the bottom modular cold box is welded to the reserved steel plate 7, and then the modular cold box 13 is installed section by section from bottom to top; before the box body of the upper modular cold box 13 is connected, a temporary working platform 16 is set up through the full-length ladder 15 inside the modular cold box 13, and the box body and container 14 of the upper modular cold box 13 are connected through the temporary working platform 16;

[0074] In a specific embodiment, the modular cold box 13 is hoisted by hoisting equipment. According to the overall weight, size, installation height, on-site working space, equipment transportation and the performance of hoisting crane of each section of modular cold box 13, the crane selection is confirmed from the perspectives of safety, economy and feasibility, and a special hoist is designed. The modular cold boxes 13 of different sections have different sizes. Preferably, the length of the special hoist can be adjusted as needed to meet the hoisting requirements of modular cold boxes 13 of different sizes. Before hoisting, a hoisting simulation is required to ensure the reliability and safety of the hoisting operation.

[0075] Specifically, a special lifting device is used to install the modular cold box 13 on site, such as Figure 3 As shown, the special sling includes a fixed bracket 9 and a sliding bracket 10 slidably connected to the fixed bracket 9. A fall chain assembly 11 is provided at one end of the fixed bracket 9. The fall chain assembly 11 is connected to the sliding bracket 10 and is used to drive the sliding bracket 10 to move along the length direction of the fixed bracket 9. The fixed bracket 9 is provided with a receiving cavity, and the sliding bracket 10 is movably arranged in the receiving cavity. The effective length of the special sling can be changed by moving the sliding bracket 10 to meet the lifting requirements of modular cold boxes 13 of different sizes; the fixed bracket 9 is also provided with a positioning ring 12 for limiting the sliding bracket 10; the fall chain assembly 11 includes an electric hoist and a fall chain, and the other end of the fall chain is connected to one end of the sliding bracket 10 close to the fall chain assembly 11; by running the electric hoist, the length of the fall chain can be controlled to drive the sliding bracket 10 to move in the fixed bracket 9, thereby realizing the adjustment of the length of the special sling;

[0076] Furthermore, in the above embodiment, the length of the special sling is determined according to the spacing between the lifting ears of the container 14, that is, the length of the two outer end faces of the special sling is the same as the spacing between the lifting ears of the container 14; when in use, the positioning ring 12 is clamped in the slide positioning groove of the sliding bracket 10, and the two positioning rings 12 are connected into one with connecting bolts; after each lifting operation is completed, the special sling is restored to its minimum length.

[0077] Furthermore, before the hoisting operation, the container in the modular cold box 13 is fixed to the lifting lug on the inner top thereof with a fall chain to ensure that the container remains stable during the hoisting process and prevents it from slipping during the hoisting process.

[0078] Furthermore, when assembling the modular cold box 13 on site, the spherical cap heads on the equipment and pipelines in the modular cold box 13 are first cut off, polished and cleaned; specifically, the spherical cap heads are provided with cutting lines, and cutting operations are performed according to the cutting lines, and then the bevels are polished as required. After completion, the cutting debris is cleaned with a vacuum cleaner in time to prevent it from entering the equipment and pipelines and affecting the operation of the cold box device. Finally, the cut portion and the surrounding area are wiped clean and sealed.

[0079] Furthermore, after the boxes of each section of the modular cold box 13 are connected in pairs, the boxes and pipelines around the modular cold box 13 are connected in pairs;

[0080] Furthermore, the modular cold box 13 is installed section by section from bottom to top, including the following steps:

[0081] The bottom modular cold box is hoisted and aligned. The bottom modular cold box is a modular cold box 13 designed at the bottom of the whole cold box. The column base plate 8 of the bottom modular cold box is welded to the reserved steel plate 7, and then the box and pipelines around it are connected. Then, a temporary working platform 16 is set up around the connection of the internal equipment of the bottom modular cold box through the full-length ladder 15 inside the bottom modular cold box. The position of the temporary working platform 16 is as follows: Figure 4 As shown; after the connection of the bottom section modular cold box 13 and the surrounding boxes and pipelines is tested, the upper section modular cold box 13 is hoisted;

[0082] Before connecting the boxes of the upper modular cold box 13, a temporary working platform 16 is set up inside the box of the installed modular cold box 13; preferably, the temporary working platform 16 is located at the segmented connection between the upper and lower modular cold boxes 13, avoiding the need to set up a working platform within the height range from the bottom to the top of the cold box, reducing personnel working time and material consumption, and saving costs.

[0083] When the upper and lower modular cold boxes 13 are connected, a special hoist is used to lift the upper modular cold box 13, and the vertical positioning block 4 is used to align the connection. Then, high-strength bolts are used to connect and fix the box body of the lower modular cold box 13 to the box body of the upper modular cold box 13.

[0084] After the upper modular cold box 13 is connected and fixed to the lower modular cold box 13, the containers 14, pipelines, bridges and instrument components of the electrical lines in the modular cold box 13 are connected in pairs, specifically including: firstly, the containers 14 are connected in pairs, followed by the docking installation of the pipelines and the installation of the brackets at the connection parts, and then the equipment and pipelines are pressure tested. After the pressure test is passed, the connecting flanges 3 of the upper and lower modular cold boxes 13 are welded, and finally the cables, bridges and instrument components in the modular cold box 13 are installed; the above operations are all performed through the temporary working platform 16 in the lower modular cold box 13.

[0085] In the above embodiment, if Figure 5 As shown, when the containers are being connected, the verticality of the containers 14 is simultaneously checked. This involves installing two sets of upper and lower adjustable brackets 23 in four directions on the outer wall of the container 14. Sensors are installed on the adjustable brackets 23, and the position of the laser on the sensor is detected by a laser collimator 19. By using the laser collimator 19 and sensors to check the verticality of the container 14, the measurement accuracy is guaranteed to the greatest extent possible and interference from human and environmental factors is prevented. The device enables remote data transmission, eliminating the need for high-altitude monitoring operations. It also enables real-time measurement, achieving precise measurement and real-time monitoring of the verticality of the container 14.

[0086] In a specific embodiment, the sensor is used as Figure 6 The wireless laser measurement target 17 shown in the figure includes an optical sensor 20, a connecting rod 21 and a control module 22. The connecting rod 21 is provided with a scale and can be rotated under the drive of the control module 22 to adjust the angle of the optical sensor 20; the connecting rod 21 is detachably provided on an adjustable bracket 23, and the adjustable bracket 23 can be adopted as follows Figure 7The structure shown includes a fixing bracket 231 and a connecting bracket 242. Both the fixing bracket 231 and the connecting bracket 242 are L-shaped structures. The fixing bracket 231 is fixedly connected to the side wall of the container 14 and has an elongated hole. The connecting bracket 242 is provided with an arcuate hole and is connected to the fixing bracket 231 by bolts passing through the elongated hole and the arcuate hole. The connection position and angle of the two can be adjusted. When in use, the adjustable bracket 23 is welded to the outer wall of the container 14, and the connecting bracket 242 is installed with bolts. Then, the wireless laser measurement target 17 is installed and its position is adjusted so that the center of the sensor is at an equal distance from the center line of the container 14 and they are both at a 90-degree angle to each other. A total of four groups of eight sensors are set up, and the laser path 18 extends from bottom to top. After the lower sensor detects a set of data values, it flips up under the drive of the control module 22, allowing the laser to pass through and reach the upper sensor, and then sends the measurement results back to the ground receiving module; each set of data values includes deviation values in the x and y directions, and the deviation value accuracy is 1mm. By analyzing and comparing multiple sets of data, the verticality deviation value and direction of the container 14 can be obtained, and the container 14 can be adjusted accordingly until its verticality meets the requirements.

[0087] After adjustment, the verticality of the container 14 is less than 1 / 1000L and not greater than ±25mm.

[0088] S8, dismantling the temporary working platform 16;

[0089] After the modular cold box 13 is assembled, the fixed support 9 of the pipeline is adjusted on the temporary working platform 16 through the full-length ladder 15, and the temporary supports of the container 14 and the pipeline are removed, and then the temporary working platform 16 is removed.

[0090] S9, system test and purge;

[0091] After the modular cold box 13 pairs are completed, the pipelines inside the box are subjected to overall pressure test and tightness test as required, and are purged according to the system.

[0092] S10, bare cold and pearl sand filling.

[0093] The modular cold box 13 is debugged. After passing the debugging, the cold box is put into bare cold trial operation.

[0094] Before bare cooling, the nuts on all pipe racks without blocks should be loosened half a turn, and the limit pins of the cold box overpressure relief device should be removed; during bare cooling, all valves and pipeline connection bolts on the cold box must be tightened with cold air.

[0095] After bare cooling and before starting, fill the cold box with pearlescent sand and the valves with insulation materials.

[0096] The pearl sand is filled with a high-altitude filling device, which consists of a storage box, a blower and a feed pipe. When in use, the feed pipes with connecting flanges at both ends are connected and fixed vertically on the railings of the platforms on each floor of the cold box. The upper end is placed in the filling port of the cold box, the lower air inlet is connected to the blower outlet, and the feed port is connected to the discharge port of the storage trough; then pour the pearl sand into the storage trough, turn on the blower to supply air to the feed pipe, and the pearl sand is sent from the storage trough into the cold box under the action of wind.

[0097] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A skid-mounted cold box segmented installation construction method, characterized in that: The following steps are involved: Deepening design: Divide the cold box into sections based on its dimensions, weight, height, number and location of towers inside the cold box, determine the section locations, and conduct BIM simulation and mechanical analysis on the routing and form of the bridges for the pipes, containers, positioning brackets, and electrical and instrumentation lines inside the cold box; Making a cold box segmented frame: setting a connecting flange at the interface of two adjacent cold box segmented frames, and setting a full-length ladder inside the cold box segmented frame; Manufacturing the modular cold box: performing horizontal installation in a factory, including installing the positioning brackets in the assembled cold box segmented frame, and then installing the containers, the pipes and cold box accessories to form the modular cold box; Welding inspection and pressure test: non-destructive inspection of the welds in the process of manufacturing the modular cold box and gas pressure test; Transporting the modular cold box: Before transporting the modular cold box, remove the valve assembly and safety valve pipeline outside the modular cold box, and seal the reserved pipe opening; Cold box foundation construction: install anchor bolts and reserved steel plates, and pour foundation concrete to the same height as the top surface of the reserved steel plates; Assemble the modular cold box on site: weld the column base plate of the bottom section modular cold box to the reserved steel plate, and then install the modular cold box section by section from bottom to top; before the box bodies of the upper section modular cold box are connected in pairs, set up a temporary working platform using the full-length ladder inside the modular cold box, and use the temporary working platform to connect the box bodies and the containers of the upper section modular cold box in pairs; dismantling the temporary working platform; System testing and purging; Bare cold and pearl sand filling.

2. The skid-mounted cold box segmented installation construction method according to claim 1 is characterized in that: The segmented position is the connection position between the upper tower and the main condenser evaporator, and the tops of the four inner skeleton columns of the cold box segmented frame where the container is to be installed are provided with lifting ears.

3. The skid-mounted cold box segmented installation construction method according to claim 1 is characterized in that: The positioning brackets include permanent brackets and temporary brackets.

4. The skid-mounted cold box segmented installation construction method according to any one of claims 1 to 3, characterized in that: The temporary operation platform is located at the segmented connection between the upper and lower sections of the modular cold box.

5. The skid-mounted cold box segmented installation construction method according to claim 4 is characterized in that: A special sling is used to lift each section of the modular cold box. The special sling includes a fixed bracket and a sliding bracket slidably connected to the fixed bracket. A fall chain assembly is provided at one end of the fixed bracket. The fall chain assembly is connected to the sliding bracket and is used to drive the sliding bracket to move along the length direction of the fixed bracket.

6. The skid-mounted cold box segmented installation construction method according to claim 5 is characterized in that: After the boxes of each section of the modular cold box are connected in pairs, the boxes and pipelines around the modular cold box are connected in pairs.

7. The skid-mounted cold box segmented installation construction method according to claim 6 is characterized in that: The step of installing the modular cold box from bottom to top comprises: Use high-strength bolts to connect and fix the box body of the lower modular cold box with the box body of the upper modular cold box; Carry out the container pair connection, pipe docking installation, and connection part bracket installation in sequence; Equipment and pipeline pressure testing; Welding the connecting flanges of the lower modular cold box and the upper modular cold box; Install cables, bridges and instrumentation inside the modular cold box.

8. The skid-mounted cold box segmented installation construction method according to claim 1 is characterized in that: The pair connection of the containers includes detecting the verticality of the containers, including setting two upper and lower groups of adjustable brackets in four directions of the outer wall of the container, setting sensors on the adjustable brackets, and detecting the laser position on the sensor by a laser collimator.

9. The skid-mounted cold box segmented installation construction method according to claim 8, characterized in that: The sensor is a wireless laser measurement target, which includes an optical sensor, a connecting rod and a control module. The connecting rod is provided with a scale and can be rotated under the drive of the control module to adjust the angle of the optical sensor.

10. The skid-mounted cold box segmented installation construction method according to claim 3, characterized in that: Before dismantling the temporary working platform, the temporary support and temporary pipe section are dismantled on the temporary working platform through the full-length ladder.

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