Sectional type air separation device and installation method thereof

Abstract

The invention relates to the technical field of air separation, in particular to a sectional type air separation device and an installation method thereof.The sectional type air separation device comprises a cold box and a low-temperature separation system, the cold box is formed by splicing a first cold box and a second cold box, and the splicing position of the first cold box and the second cold box is a cutting area; the first cold box and the second cold box are formed by cutting the cold box along a cutting area, the low-temperature separation system is arranged in the cold box, the low-temperature separation system is formed by splicing a first low-temperature separation system and a second low-temperature separation system, and the first low-temperature separation system and the second low-temperature separation system are formed by cutting the low-temperature separation system along the cutting area; the first low-temperature separation system is located in the first cold box, and the second low-temperature separation system is located in the second cold box. The sectional type air separation device is cut along the cutting area and then transported to an installation site to be spliced and welded, and the problem that a traditional air separation device cannot give consideration to both the installation quality and the transportation size overrun is solved.

Description

Technical Field

[0001] The present application relates to the technical field of air separation, and in particular to a segmented air separation device and an installation method thereof. Background Art

[0002] In the process of air separation using deep freezing, the cryogenic separation system is placed in an insulated box, generally called a cold box. The cold box is a tall box structure, generally ranging from 20 to 80 meters in height, which contains cryogenic separation equipment and pipelines and is filled with pearlescent sand insulation material for cold preservation. There are two main methods for manufacturing and installing traditional air separation units:

[0003] One method is to manufacture the cold box shell structure in pieces in the manufacturing plant workshop, and then ship the internal low-temperature separation equipment, pipelines, valves, etc. in bulk to the site, and perform all the installation work on site. Although this method solves the problem of the cold box transportation length exceeding the transportation limit size, the complex on-site installation work will lead to quality problems in the assembled air separation device.

[0004] The other method is to manufacture the entire air separation unit in the factory workshop and then transport it to the site for lifting and installation. Although this method reduces the complexity and workload of on-site installation, it is not suitable for air separation units whose size exceeds transportation restrictions. Summary of the Invention

[0005] The segmented air separation device and the installation method thereof provided in the present application are intended to solve the problem that traditional air separation devices cannot achieve both installation quality and transportation overruns.

[0006] In order to solve the above technical problems, the present application proposes an air separation device, which includes: a cold box and a low-temperature separation system;

[0007] The cold box is formed by splicing a first cold box and a second cold box, the splicing portion of the first cold box and the second cold box is a cutting area, and the first cold box and the second cold box are formed by cutting the cold box along the cutting area;

[0008] The low-temperature separation system is arranged in the cold box, and the low-temperature separation system is composed of a first low-temperature separation system and a second low-temperature separation system. The first low-temperature separation system and the second low-temperature separation system are formed by cutting the low-temperature separation system along the cutting area. The first low-temperature separation system is located in the first cold box, and the second low-temperature separation system is located in the second cold box.

[0009] Furthermore, the segmented air separation device also includes a fixed bracket, which is fixedly installed in the cold box. The fixed bracket includes a through groove, and the low-temperature separation system runs through the through groove to maintain the stability of the low-temperature separation system.

[0010] Furthermore, a plurality of the fixing brackets are evenly distributed along the length direction of the cold box.

[0011] Furthermore, the first cold box and the second cold box are both provided with fixed brackets near the cutting area, so that after the cold box is cut along the cutting area, the cut can maintain a stable shape.

[0012] Furthermore, a first through hole is provided in the first cold box near the cutting area, and the first through hole passes through the surface of the first cold box. The first low-temperature separation system includes a first instrument gas sampling tube, and the first instrument gas sampling tube is led out from the first through hole to reduce the incision when the segmented air separation device is cut along the cutting area.

[0013] Furthermore, a second through hole is provided at a position of the second cold box away from the cutting area, and the second through hole runs through the surface of the second cold box. The second low-temperature separation system includes a second instrument gas sampling tube, and the second instrument gas sampling tube is led out from the second through hole. When the segmented air separation device is placed vertically, the second through hole is close to the ground for easy operation.

[0014] Furthermore, the cold box includes a structural frame and a shell panel, the shell panel covers the structural frame, the structural frame includes beams and columns, the beams and columns are vertically connected, and several beams and several columns form a rectangular structural frame.

[0015] Furthermore, the structural frame further includes diagonal braces, and a plurality of diagonal braces are provided between two adjacent crossbeams, and the diagonal braces are fixedly connected to the crossbeams.

[0016] Furthermore, the diagonal brace and the shell panel are arranged outside the cutting area to reduce the incision during cutting.

[0017] In a second aspect, the present application provides a method for installing a segmented air separation device, which is used for the segmented air separation device described above. The method for installing the segmented air separation device comprises the following steps:

[0018] Cutting the integrally manufactured segmented air separation device into two parts, a first segmented air separation device and a second segmented air separation device, along the cutting area;

[0019] transporting the cut first segmented air separation unit and the second segmented air separation unit to an installation site;

[0020] Assembling and welding the first segmented air separation unit and the second segmented air separation unit at the installation site;

[0021] The welded segmented air separation device is hoisted into place.

[0022] The beneficial effects of the present application are as follows: in the segmented air separation device and its installation method provided in the present application, the segmented air separation device includes a cold box and a low-temperature separation system, the cold box is composed of a first cold box and a second cold box, the joint of the first cold box and the second cold box is a cutting area, the first cold box and the second cold box are formed by cutting the cold box along the cutting area, the low-temperature separation system is arranged in the cold box, the low-temperature separation system is composed of a first low-temperature separation system and a second low-temperature separation system, the first low-temperature separation system and the second low-temperature separation system are formed by cutting the low-temperature separation system along the cutting area, the first low-temperature separation system is located in the first cold box, and the second low-temperature separation system is located in the second cold box. By dividing the segmented air separation device into two parts along the cutting area and transporting them to the site for assembly and welding, it can meet the size restrictions of transportation and reduce the complexity of on-site installation work, effectively improving the installation quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0024] Figure 1 is a perspective view of a segmented air separation apparatus according to an embodiment of the present invention;

[0025] Figure 2 1. It is a schematic diagram of the three-dimensional structure of a segmented air separation device according to one embodiment of the present invention;

[0026] Figure 3 This is a partial enlarged view of a segmented air separation device according to an embodiment of the present invention;

[0027] Figure 4 FIG. 1 is a schematic diagram of a fixing bracket according to an embodiment of the present invention.

[0028] Explanation of the accompanying drawings: 100, low-temperature separation system; 110, first low-temperature separation system; 120, second low-temperature separation system; 200, fixed bracket; 210, through groove; 300, cold box; 310, structural frame; 311, crossbeam; 312, column; 313, diagonal brace; 320, shell panel; 321, first through hole; 322, second through hole; 330, first cold box; 340, second cold box; 400, cutting area; 500, heat exchanger cold box; 600, expander bridge cold box. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0030] It will be understood by those skilled in the art that, unless expressly stated otherwise, the singular forms "a", "an", "above", and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of this application refers to the presence of features, integers, steps, operations, elements, modules, modules and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or wireless couplings. The term "and / or" used herein includes all or any module and all combinations of one or more associated listed items.

[0031] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0032] like Figure 1As shown, the present application provides a segmented air separation device, which includes a cold box 300 and a low-temperature separation system 100. The cold box 300 is composed of a first cold box 330 and a second cold box 340. The joint of the first cold box 330 and the second cold box 340 is a cutting area 400. The first cold box 330 and the second cold box 340 are formed by cutting the cold box 300 along the cutting area 400. The low-temperature separation system 100 is arranged in the cold box 300. The low-temperature separation system 100 is composed of a first low-temperature separation system 110 and a second low-temperature separation system 120. The first low-temperature separation system 110 and the second low-temperature separation system 120 are formed by cutting the low-temperature separation system 100 along the cutting area 400. The first low-temperature separation system 110 and the second low-temperature separation system 120 are formed by cutting the low-temperature separation system 100 along the cutting area 400. The first low-temperature separation system 110 is located in the first cold box 330, and the second low-temperature separation system 120 is located in the second cold box 340.

[0033] In a specific embodiment, the cryogenic separation system 100 is the core part of the air separation device, which separates air into different components, such as oxygen, nitrogen, etc., through cryogenic technology. Its working principle is to utilize the different boiling points of the components in the air to liquefy and separate them in sequence under a low-temperature environment. The cryogenic separation system 100 is fixedly installed in a cold box 300. The cold box 300 is a key component that provides a low-temperature environment for the cryogenic separation system 100. The cold box 300 is composed of a first cold box 330 and a second cold box 340. The joint of the first cold box 330 and the second cold box 340 is the cutting area 400 of the cold box 300. Preferably, the cutting area 400 is located in the middle area of the cold box. The cold box 300 is cut into two parts along the cutting area 400 to obtain the first cold box 330 and the second cold box 340.

[0034] The low-temperature separation system 100 is also composed of a first low-temperature separation system 110 and a second low-temperature separation system 120. During the above-mentioned process of cutting the cold box 300 along the cutting area 400, the low-temperature separation system 100 will also be divided into two parts, namely the first low-temperature separation system 110 and the second low-temperature separation system 120, and the first low-temperature separation system 110 is located in the first cold box 330, and the second low-temperature separation system 120 is located in the second cold box 340.

[0035] In this embodiment, the segmented air separation device is divided into two parts by the cutting area 400, so that the cold box 300 is divided into a first cold box 330 and a second cold box 340, and the low-temperature separation system 100 is divided into a first low-temperature separation system 110 and a second low-temperature separation system 120. After arriving at the site, the two parts are assembled and welded to form a complete segmented air separation device.

[0036] In summary, in actual transportation, there are often size restrictions for large equipment. Traditional integral air separation units may not be able to be transported smoothly due to their large size, but this segmented design can divide the unit into two parts, effectively reducing the transportation size, making the transportation process more convenient, and reducing transportation costs and difficulty. Compared with shipping the air separation unit in bulk to the site, transporting the two-part segmented air separation unit to the site for assembly and welding reduces the workload of complex assembly on site. Only relatively simple splicing and welding work is required on site, which greatly shortens the installation cycle and improves the installation quality and efficiency. And because most of the components can be installed in the factory, and more stringent quality inspections can be carried out in the factory environment, the errors and quality problems that may occur during the on-site installation process are reduced, thereby effectively improving the installation quality of the entire device.

[0037] like Figure 4 As shown, the segmented air separation device further includes a fixed bracket 200 , which is fixedly installed in the cold box 300 . The fixed bracket 200 includes a through slot 210 , and the low-temperature separation system 100 passes through the through slot 210 to maintain the stability of the low-temperature separation system 100 .

[0038] In a specific embodiment, the fixed bracket 200 is welded inside the cold box 300. The fixed bracket 200 can be used to maintain the shape and structure of the cold box 300, effectively preventing the cold box 300 from deforming during transportation, which would affect the subsequent welding effect. The fixed bracket 200 is roughly in the shape of a "well", and the middle part of the fixed bracket 200 is a rectangular through groove 210. The low-temperature separation system 100 includes a low-temperature separation device and a pipeline. The pipeline is connected to the low-temperature separation device. The shape and size of the through groove 210 are adapted to the low-temperature separation device. The low-temperature separation device passes through the through groove 210 of the fixed bracket 200. The function of the through groove 210 is to provide a positioning and restraining space for the low-temperature separation system 100, so that the low-temperature separation system 100 always maintains a specific position and direction during operation, thereby ensuring its verticality.

[0039] like Figure 1 As shown, a plurality of fixing brackets 200 are evenly distributed along the length direction of the cold box 300 .

[0040] In one embodiment, a plurality of fixing brackets 200 are provided, and the fixing brackets 200 are arranged at equal intervals along the length of the cold box 300. This distribution allows the fixing brackets 200 to provide more balanced support to the cold box 300 and the low-temperature separation system 100.

[0041] In summary, the evenly distributed fixing brackets 200 maintain the overall shape stability of the cold box 300 and evenly support the weight of the cryogenic separation system 100, preventing deformation or damage to the system due to insufficient local support. During operation, the evenly distributed fixing brackets 200 also better resist various vibrations and external forces, ensuring system stability and reliability.

[0042] like Figure 1 As shown, the first cold box 330 and the second cold box 340 are both provided with fixing brackets 200 near the cutting area 400, so that after the cold box 300 is cut along the cutting area 400, the cut can maintain a stable shape.

[0043] In a specific embodiment, fixed brackets 200 are provided near the cutting area 400 of the first cold box 330 and the second cold box 340. When the cold box 300 is cut into two parts along the cutting area 400, these fixed brackets 200 can support the structure at the incision to prevent the structure at the incision from being deformed during transportation and affecting the subsequent welding effect.

[0044] In summary, setting a fixed bracket 200 at the cutting area 400 can effectively enhance the structural strength of the incision, ensure that the incisions of the first cold box 330 and the second cold box 340 maintain a stable shape after cutting, and provide a good foundation for subsequent assembly and welding work.

[0045] like Figure 2 As shown, the first cold box 330 is provided with a first through hole 321 near the cutting area 400. The first through hole 321 runs through the surface of the first cold box 330. The first low-temperature separation system 110 includes a first instrument gas sampling tube, which is led out from the first through hole 321 to reduce the incision when the segmented air separation device is cut along the cutting area 400.

[0046] In one embodiment, the first through holes 321 are a row of holes formed in the first cold box 330 near the cutting area 400 . The first through holes 321 penetrate the first cold box 330 .

[0047] First cryogenic separation system 110 includes a first instrument gas sampling tube, which connects to the cryogenic separation equipment and piping within first cryogenic separation system 110 to extract instrument gas samples for testing and analysis of parameters such as gas composition and pressure within the system. The first instrument gas sampling tube is routed through first through-hole 321, preventing the first instrument gas sampling tube from passing from first cold box 330 to second cold box 340. This reduces the need for cutting and welding the first instrument gas sampling tube, thus reducing on-site installation workload.

[0048] like Figure 2As shown, the second cold box 340 is provided with a second through hole 322 at a position away from the cutting area 400. The second through hole 322 runs through the surface of the second cold box 340. The second low-temperature separation system 120 includes a second instrument gas sampling tube, which is led out from the second through hole 322. When the segmented air separation device is placed vertically, the second through hole 322 is close to the ground for easy operation.

[0049] In one embodiment, the second through holes 322 are a row of holes opened on a side of the second cold box 340 away from the cutting area 400 , and the second through holes 322 pass through the second cold box 340 .

[0050] Second cryogenic separation system 120 includes a second instrument gas sampling tube, which connects to the cryogenic separation equipment and piping within the system to extract instrument gas samples for testing and analysis of parameters such as gas composition and pressure within the system. The second instrument gas sampling tube exits through second through-hole 322. During on-site installation of the segmented air separation unit, the unit must be placed vertically. In this case, second through-hole 322 is closer to the ground, facilitating manual operation.

[0051] like Figure 2 and Figure 3 As shown, the cold box 300 includes a structural frame 310 and a shell panel 320, the shell panel 320 covers the structural frame 310, the structural frame 310 includes a beam 311 and a column 312, the beam 311 and the column 312 are vertically connected, and a plurality of beams 311 and a plurality of columns 312 enclose a rectangular parallelepiped structural frame 310.

[0052] In a specific embodiment, the cold box 300 includes a structural frame 310 and a shell panel 320. The structural frame 310 supports the entire cold box 300. The structural frame 310 is generally made of a solid metal material and has a certain strength and stability. The shell panel 320 is welded to the structural frame 310, making the cold box 300 a sealed container to prevent the loss of cold. The structural frame 310 includes a plurality of long cross beams 311 and a plurality of long columns 312. When the cross beams 311 are arranged horizontally and the columns 312 are perpendicular to the ground, the cross beams 311 and the columns 312 are welded perpendicularly to each other. The multiple cross beams 311 and the multiple columns 312 are arranged in a certain manner to form a rectangular parallelepiped structural frame 310. This rectangular parallelepiped structural frame 310 provides a storage space for the low-temperature separation system 100 and provides a stable support foundation for the segmented air separation device.

[0053] In summary, the rectangular structural frame 310 facilitates the rational planning of the spatial layout inside the cold box 300, and can conveniently install the low-temperature separation system 100 and other related equipment and pipelines. The rectangular structural frame 310 has good stability and load-bearing capacity, and can effectively resist forces from all directions, including gravity, wind force, vibrations generated during equipment operation, etc., to ensure that the segmented air separation device can remain stable under various working conditions.

[0054] like Figure 3 As shown, the structural frame 310 further includes diagonal braces 313 . A plurality of diagonal braces 313 are provided between two adjacent crossbeams 311 , and the diagonal braces 313 are fixedly connected to the crossbeams 311 .

[0055] In one embodiment, the diagonal brace 313 is in the form of an elongated strip. The diagonal brace 313 is a support component disposed obliquely within the structural frame 310 to enhance the stability of the structural frame 310. The diagonal brace 313 is connected between two adjacent crossbeams 311. The diagonal brace 313 and the crossbeams 311 are fixed by welding. The diagonal brace 313 and the crossbeams 311 form a triangular structure that provides additional support.

[0056] In summary, the arrangement of the diagonal braces 313 enables the structural frame 310 to form a plurality of triangular structures. The triangle has the characteristic of strong stability, which greatly enhances the ability of the structural frame 310 to resist deformation. Even when subjected to a large external force, it can effectively prevent the crossbeam 311 from bending or deforming, thereby ensuring the safe operation of the segmented air separation device.

[0057] like Figure 2 As shown, the diagonal brace 313 and the housing panel 320 are arranged outside the cutting area 400 to reduce the cutting opening.

[0058] In one embodiment, when the segmented air separation unit is manufactured in a factory, the diagonal braces 313 and the shell panels 320 are not installed at the cutting area 400. Therefore, when the segmented air separation unit is divided along the cutting area 400, the diagonal braces 313 and the shell panels 320 do not need to be cut, thereby reducing the number of cuts and the difficulty of cutting. At the installation site, after the two segmented air separation units are welded together, the diagonal braces 313 and the shell panels 320 are welded at the cutting area 400 to form a complete segmented air separation unit.

[0059] like Figure 2 As shown, the segmented air separation device further includes a heat exchanger cold box 500 and an expander bridge cold box 600 , and the heat exchanger cold box 500 and the expander bridge cold box 600 are arranged adjacent to the second cold box 340 .

[0060] On the other hand, the present application also provides a method for installing a segmented air separation device, the method comprising the following steps:

[0061] S1: cutting the integrally manufactured segmented air separation device into a first segmented air separation device and a second segmented air separation device along a cutting zone 400;

[0062] S2: transporting the cut first segmented air separation unit and the second segmented air separation unit to the installation site;

[0063] S3: Assembling and welding the first segmented air separation unit and the second segmented air separation unit at the installation site;

[0064] S4: Hoist the welded segmented air separation unit into place.

[0065] Specifically, in S1, when manufacturing the integral segmented air separation device, the shell panel 320 and the diagonal brace 313 are not welded near the cutting area 400, so as to facilitate the subsequent welding of the structural frame 310 and the pipeline on site; after the integral segmented air separation device is manufactured, non-destructive testing, pressure testing, and leak detection steps need to be carried out; after the segmented air separation device is cut, the cut part needs to be sealed.

[0066] In S3, when assembling and welding the first segmented air separation unit and the second segmented air separation unit, horizontal welding is adopted to avoid the risk of high-altitude operation; after the assembly and welding are completed, reinforcing ribs are welded at the welds to enhance the structural strength; the shell panel 320 and the diagonal brace 313 are welded in the cutting area 400 to make the cold box 300 sealed; after the welding is completed, the welds are subjected to 100% non-destructive testing.

[0067] In S4, after the hoisting is completed, the segmented air separation unit is subjected to an overall pressure test, leak detection, and purging treatment, wherein purging refers to cleaning out the debris in the pipeline of the segmented air separation unit; the segmented air separation unit is subjected to bare cooling and leak detection treatment again, wherein bare cooling refers to performing a low-temperature test on the segmented air separation unit when the cold box 300 has not yet been filled with cold insulation materials; thereafter, pearlescent sand is filled in the cold box 300; finally, the segmented air separation unit is started and debugged.

[0068] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A segmented air separation device, characterized in that: include: cold boxes and cryogenic separation systems; The cold box is formed by splicing a first cold box and a second cold box, the splicing portion of the first cold box and the second cold box is a cutting area, and the first cold box and the second cold box are formed by cutting the cold box along the cutting area; The low-temperature separation system is arranged in the cold box, and the low-temperature separation system is composed of a first low-temperature separation system and a second low-temperature separation system. The first low-temperature separation system and the second low-temperature separation system are formed by cutting the low-temperature separation system along the cutting area. The first low-temperature separation system is located in the first cold box, and the second low-temperature separation system is located in the second cold box.

2. The staged air separation device according to claim 1, characterized in that: The segmented air separation device further includes a fixed bracket, which is fixedly installed in the cold box. The fixed bracket includes a through slot, and the low-temperature separation system passes through the through slot to maintain the stability of the low-temperature separation system.

3. The staged air separation device according to claim 2, characterized in that: A plurality of the fixing brackets are evenly distributed along the length direction of the cold box.

4. The staged air separation device according to claim 2, characterized in that: The first cold box and the second cold box are both provided with fixing brackets near the cutting area, so that after the cold box is cut along the cutting area, the cut can maintain a stable shape.

5. The staged air separation device according to claim 1, characterized in that: A first through hole is provided in the first cold box near the cutting area. The first through hole passes through the surface of the first cold box. The first low-temperature separation system includes a first instrument gas sampling tube. The first instrument gas sampling tube is led out from the first through hole to reduce the incision when the segmented air separation device is cut along the cutting area.

6. The staged air separation device according to claim 1, characterized in that: A second through hole is provided in the second cold box at a position away from the cutting area. The second through hole runs through the surface of the second cold box. The second low-temperature separation system includes a second instrument gas sampling pipe. The second instrument gas sampling pipe is led out from the second through hole. When the segmented air separation device is placed vertically, the second through hole is close to the ground for easy operation.

7. The staged air separation device according to claim 1, characterized in that: The cold box includes a structural frame and a shell panel, the shell panel covers the structural frame, the structural frame includes beams and columns, the beams and columns are vertically connected, and several beams and several columns form a rectangular structural frame.

8. The staged air separation device according to claim 7, characterized in that: The structural frame further comprises diagonal braces, and a plurality of diagonal braces are provided between two adjacent cross beams, and the diagonal braces are fixedly connected to the cross beams.

9. The staged air separation device according to claim 8, characterized in that: The diagonal brace and the shell panel are arranged outside the cutting area so as to reduce the number of cuts during cutting.

10. A method for installing a segmented air separation device, for use in the segmented air separation device according to any one of claims 1 to 9, the method comprising the following steps: Cutting the integrally manufactured segmented air separation device into two parts, a first segmented air separation device and a second segmented air separation device, along the cutting area; transporting the cut first segmented air separation unit and the second segmented air separation unit to an installation site; Assembling and welding the first segmented air separation unit and the second segmented air separation unit at the installation site; The welded segmented air separation device is hoisted into place.

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