A skid-mounted heat exchanger cold box

Abstract

The present invention relates to the technical field of heat exchanger cold boxes, and more specifically, to a skid-mounted heat exchanger cold box, comprising a cylindrical shell filled with insulation material, a plurality of heat exchange cores arranged in the shell, a plurality of reinforcement rings arranged on the inner wall of the shell, a plurality of support beams arranged on the heat exchange core, the support beams being arranged on the tops of the reinforcement rings, a waist-shaped hole being provided at one end of the support beam, and a circular hole being provided at the other end, and fasteners for fixing the support beams to the reinforcement rings are passed through the waist-shaped hole and the circular hole. The cylindrical shell is convenient for reducing wind load and shaking amplitude during the skid-mounting process, and the cylindrical shell is more conducive to evenly dispersing the pressure brought by the internal insulation material, thereby preventing deformation of the shell due to internal stress concentration. The reinforcement ring can further enhance the shell's resistance to deformation, and the waist-shaped hole can allow the support beam to produce a certain deformation, thereby avoiding damage to the support beam due to stress concentration when the support beam contracts in the cold.

Description

Technical Field

[0001] The present invention relates to the technical field of skid-mounted heat exchanger cold boxes, and more particularly, to a skid-mounted heat exchanger cold box. Background Art

[0002] Air separation equipment uses air as a raw material, converting it into a liquid through a compression cycle and deep freezing. It then undergoes distillation to gradually separate and produce inert gases such as oxygen, nitrogen, and argon from the liquid air. An air separation plant is a large, complex system primarily composed of the following subsystems: power system, purification system, refrigeration system, heat exchange system, distillation system, product delivery system, liquid storage system, and control system.

[0003] As my country's air separation technology continues to improve, air separation units are trending towards larger, skid-mounted systems. Major air separation manufacturers are investing heavily in R&D in this area. Skid-mounted systems, with their controllable quality and ease of installation, are highly favored by customers. The degree of skid-mounted systems is even used as an indicator of a manufacturer's R&D capabilities.

[0004] A heat exchanger, including a low-temperature heat exchanger and cold box equipment, is disclosed, belonging to the field of thermal energy utilization technology. The heat exchanger and cold box equipment are composed of a shell and a mosquito-repellent coil or serpentine heat exchange pipe disposed within the shell. A first inlet for introducing a high-temperature fluid to be cooled is provided at the top of the shell's cavity, and a first outlet for discharging a low-temperature liquid is provided at the bottom of the shell's cavity. Multiple mosquito-repellent coils or serpentine coils are stacked and connected from bottom to top to form a columnar shape. The heat exchange pipe of the columnar mosquito-repellent coil or serpentine coil is disposed within the shell's cavity. A second inlet of the heat exchange pipe is drawn from the bottom of the cavity, and a second outlet of the heat exchange pipe is drawn from the top of the cavity.

[0005] The above-mentioned existing skid-mounted heat exchanger cold box has a low skid-mounting degree, and it is difficult to fill the cold box with insulation material evenly. At the same time, the insulation material filled in the cold box is easy to squeeze and deform the inner wall of the cold box. Summary of the Invention

[0006] The present invention provides a skid-mounted heat exchanger cold box to overcome the problems of low skid-mounting degree and easy deformation of the inner wall of the cold box in the above-mentioned prior art.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a skid-mounted heat exchanger cold box, comprising a cylindrical shell filled with insulation material, a plurality of heat exchange cores are arranged in the shell, a plurality of reinforcement rings are arranged on the inner wall of the shell, and a plurality of support beams are provided on the heat exchange core, and the support beams are arranged on the top of the reinforcement rings.

[0008] The cylindrical shell is convenient for reducing wind load and shaking amplitude during the skid installation process, making it easier to skid. At the same time, the cylindrical shell is more conducive to evenly dispersing the pressure brought by the internal insulation material, preventing deformation of the shell due to internal stress concentration. The reinforcement ring can further enhance the shell's resistance to deformation. At the same time, the reinforcement ring also provides support for the heat exchange core in the shell, so that the heat exchange core can be stably set in the shell through the support beam. When filling the shell with insulation material, there are a large number of beams and diagonal braces in the existing square cold box. There are many areas at the bottom of the beams, the bottom of the diagonal braces and their nodes that cannot be filled with insulation material. Since the shell in the present invention is a vertical cylindrical shell, its inner wall has no other obstructions except the reinforcement ring, thereby ensuring that the insulation material can be filled everywhere in the shell without filling dead zones, and the insulation effect is good.

[0009] Furthermore, the heat exchange core is provided with a plurality of support ears, which are installed on the top of the support beam; one end of the support beam is provided with a waist-shaped hole, and the other end is provided with a round hole, and the waist-shaped hole and the round hole are both provided with fasteners for fixing the support beam to the reinforcement ring.

[0010] Furthermore, the number of the supporting ears is two, and the two supporting ears are symmetrically arranged on both sides of the two heat exchange cores, and the supporting ears are fixed to the support beams by bolts.

[0011] Furthermore, insulation panels are provided between the support lugs and the support beams, and between the support beams and the reinforcement rings.

[0012] Furthermore, the insulation board is made of perlite, and is sandwiched between the lug and the support beam, and between the support beam and the reinforcement ring, and the fastener passes through the insulation board.

[0013] By adopting the above technical solution, it is possible to prevent the heat in the heat exchange core from being dissipated to the outside through the path of the lug-support beam-reinforcement ring-shell, thereby avoiding the heat loss from affecting the heat exchange work.

[0014] Furthermore, a manhole is provided on the top of the shell, and a ladder is provided on the heat exchange core.

[0015] By adopting the above technical solution, technicians can enter the shell through the manhole and move on the surface of the heat exchange core by climbing the ladder, thereby facilitating maintenance of the heat exchange core.

[0016] Furthermore, a skirt is provided at the bottom of the shell.

[0017] By adopting the above technical solution, the entire shell can be quickly installed on the required ground using the skirt, which facilitates the installation of the entire cold box at the installation site.

[0018] Furthermore, a hot end pipe is provided at the top of the heat exchange core, and the hot end pipe passes through the top of the shell; a cold end pipe is provided at the bottom of the heat exchange core, and the bottom of the heat exchange core is provided with a cold end pipe for connecting with other cold boxes; a plurality of connecting pipes are provided on the outer wall of the shell, and the plurality of connecting pipes are connected to the cold end pipes one by one.

[0019] Furthermore, the shell is provided with a plurality of axial lifting ears.

[0020] On the other hand, the present invention also provides a method for installing a skid-mounted heat exchanger cold box, comprising the following steps:

[0021] S1. Adjust the shell with the top opening to a level in the workshop;

[0022] S2. Place the heat exchange core into the shell from the top opening of the shell, and install and secure the heat exchange core in the shell;

[0023] S2. Close the top opening of the shell, then install the cold end pipe and the hot end pipe on the shell and connect them to the heat exchange core;

[0024] S3. Install the connecting pipe on the shell, connect the connecting pipe to the cold end pipe, and then install the shaft lug on the outer wall of the shell;

[0025] S4. Transport the shell to the site of use and rotate the shell to a vertical position;

[0026] S5. Install the skirt on the civil foundation at the desired installation location, and then fill the shell with insulation material through the manhole to complete the installation.

[0027] Furthermore, the S2 specifically includes the following steps:

[0028] S21. The heat exchange core is hoisted into the shell through the opening of the shell;

[0029] S22. A perforation is provided on the side wall of the housing through which a support beam is provided, and the support beam is inserted into the housing through the perforation, and fasteners are used to secure the support beam to the lugs, the support beam to the reinforcement ring, and then the perforation is sealed;

[0030] S23. Connect the cold end pipe to the connecting pipe, thus completing the installation of the heat exchange core in the shell.

[0031] By adopting the above technical solution, skid-mounted installation of the skid-mounted heat exchanger cold box avoids the constraints of weather, site conditions, and other factors at the site, which can hinder timely and quality completion. Assembly in a workshop is not subject to these constraints. Furthermore, given the extensive welding work and high cleanliness requirements within the cold box, workshop installation allows for excellent quality control and ensures cleanliness within the piping. This significantly reduces on-site workload and ensures installation quality.

[0032] Furthermore, the thermal insulation material is pearl sand.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The cylindrical shell is convenient for reducing wind load and shaking amplitude during skid installation, making it easier to skid install. At the same time, the cylindrical shell is more conducive to evenly distributing the pressure brought by the internal insulation material, preventing deformation of the shell due to internal stress concentration. The reinforcement ring can further enhance the shell's resistance to deformation. At the same time, the reinforcement ring also provides support for the heat exchange core inside the shell, so that the heat exchange core can be stably set in the shell. Since the temperature inside the shell is low when the heat exchanger is working, the support beam is prone to deformation and contraction due to cold. The waist-shaped hole can allow the support beam to produce a certain deformation, thereby avoiding damage to the support beam due to stress concentration during pre-cooling contraction.

[0035] 2. When filling the shell with insulation material, existing square cold boxes have a large number of beams and diagonal braces. There are many areas at the bottom of the beams, the bottom of the diagonal braces and their nodes that are not filled with insulation material. Since the shell of the present invention is a vertical cylindrical shell, its inner wall has no other obstructions except for the reinforcement ring, which ensures that the insulation material can be filled everywhere in the shell without filling dead areas, and the insulation effect is good.

[0036] 3. The support beam is provided, which not only facilitates the hoisting of the heat exchange core, but also can directly contact the reinforcement ring to complete the installation of the heat exchange core in the shell, which is convenient and quick;

[0037] 4. Skid-mounted installation of the skid-mounted heat exchanger cold box avoids constraints on site, such as weather and site conditions, which can hinder timely and quality completion. Assembly in a workshop is not subject to these constraints. Furthermore, given the extensive welding work and high cleanliness requirements within the cold box, workshop installation provides excellent quality control and ensures cleanliness within the piping. This significantly reduces on-site workload and ensures installation quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a skid-mounted heat exchanger cold box of the present invention;

[0039] Figure 2 This is a schematic diagram of the internal structure of an embodiment of a skid-mounted heat exchanger cold box of the present invention;

[0040] Figure 3 This is a schematic diagram of the internal structure of a skid-mounted heat exchanger cold box according to an embodiment of the present invention from another perspective;

[0041] Figure 4 yes Figure 3 Enlarged view of part A;

[0042] Figure 5 This is a schematic diagram of the internal structure of a skid-mounted heat exchanger cold box according to an embodiment of the present invention from another perspective;

[0043] Figure 6 The present invention is a flow chart of a method for installing a skid-mounted heat exchanger cold box.

[0044] In the attached figure: 1. Shell; 2. Heat exchange core; 3. Reinforcement ring; 4. Support beam; 5. Skirt; 6. Cold end pipe; 7. Hot end pipe; 8. Connecting pipe; 9. Axial lifting lug; 10. Waist-shaped hole; 11. Round hole; 12. Fastener; 13. Support lug; 14. Insulation board; 15. Manhole; 16. Ladder. DETAILED DESCRIPTION

[0045] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0046] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0048] Example 1

[0049] Reference Figures 1 to 5, is Example 1 of a skid-mounted heat exchanger cold box of the present invention, comprising a cylindrical shell 1, wherein a plurality of heat exchange cores 2 are arranged in the shell 1, a plurality of reinforcement rings 3 are provided on the inner wall of the shell 1, a plurality of support beams 4 are provided on the heat exchange core 2, the support beams 4 are arranged on the top of the reinforcement ring 3, a waist-shaped hole 10 is provided at one end of the support beam 4, and a circular hole 11 is provided at the other end, and fasteners 12 for fixing the support beam 4 to the reinforcement ring 3 are passed through the waist-shaped hole 10 and the circular hole 11.

[0050] Specifically, there are two reinforcement rings 3, spaced apart and arranged parallel to each other in the middle of the shell 1. The reinforcement rings 3 are coaxial with the shell 1, and their outer walls are welded to the inner wall of the shell 1. There are two heat exchange cores 2, each in the shape of a square column, and arranged in parallel. Fasteners 12 are bolts. There are two support beams 4, symmetrically arranged on either side of the two heat exchange cores 2. The support beams 4 are in the shape of a square column, with their axes perpendicular to the axial direction of the heat exchange core 2. The shell 1 is also filled with insulation material.

[0051] The cylindrical shell 1 reduces wind loads and sway during skid installation, facilitating skid installation. It also evenly distributes the pressure from the internal insulation material, preventing deformation of the shell 1 due to internal stress concentration. The reinforcement ring 3 further enhances the shell 1's resistance to deformation and provides support for the heat exchange core 2 within the shell 1, ensuring its stable placement.

[0052] When filling the shell 1 with insulation material, there are a large number of beams and diagonal braces in the existing square cold box. There are many areas at the bottom of the beams, the bottom of the diagonal braces and their nodes that cannot be filled with insulation material. Since the shell 1 in the present invention is a vertical cylindrical shape, its inner wall has no other obstructions except the reinforcement ring 3, which ensures that the insulation material can be filled everywhere in the shell 1 without filling dead areas, and the insulation effect is good. The circular holes 11 and waist-shaped holes 10 at both ends of the support beam 4 provide installation holes for the fasteners 12 to fix the support beam 4 to the reinforcement ring 3. At the same time, since the temperature inside the shell 1 is low when the heat exchanger is working, the support beam 4 is prone to deformation and contraction when it is cold. The waist-shaped holes 10 can allow the support beam 4 to produce a certain deformation, thereby avoiding damage due to stress concentration when the support beam 4 is pre-cooled and contracted.

[0053] In this embodiment, the heat exchange core 2 is provided with a plurality of lugs 13, which are mounted on the top of the support beam 4. Specifically, each heat exchange core 2 is provided with a number of lugs 12 corresponding to the number of support beams 4, and each lug 13 is located on the top of a support beam 4 and is fixed to the top of the support beam 4 by bolts.

[0054] In this embodiment, a heat insulation plate 14 is provided between the support ear 13 and the support beam 4 , and between the support beam 4 and the reinforcement ring 3 .

[0055] Specifically, in this embodiment, the insulation board 14 is made of perlite and is sandwiched between the lug 13 and the support beam 4, and between the support beam 4 and the reinforcement ring 3. The fastener 12 passes through the insulation board 14. The insulation board 14 prevents heat from the heat exchange core 2 from being dissipated to the outside through the path of the lug 13, the support beam 4, the reinforcement ring 3, and the housing 1, thereby preventing heat loss from affecting heat exchange performance.

[0056] In this embodiment, the shell 1 is arranged vertically. The vertically arranged shell 1 not only facilitates the placement of the heat exchange core 2, but also allows most of the pressure brought by the insulation material poured into the shell 1 to be applied to the bottom of the shell 1. Since the bottom of the shell 1 is in contact with the ground, the bottom of the shell 1 can be prevented from deforming, thereby reducing the pressure on the side walls of the shell 1. At the same time, the vertically arranged shell 1 also facilitates the insulation material to be evenly filled inside the shell 1.

[0057] In this embodiment, a manhole 15 is provided on the top of the shell 1 , and a ladder 16 is provided on the heat exchange core 2 .

[0058] Specifically, three manholes 15 are provided on the top of the shell 1 and the manholes are covered with covers. When the equipment of the shell 1 needs to be repaired, technicians can enter the shell 1 through the manholes 15 and move on the surface of the heat exchange core 2 using the ladder 16.

[0059] In this embodiment, a hot end pipe 7 is provided at the top of the heat exchange core 2, and the hot end pipe 7 passes through the top of the shell 1 and is connected to the heat exchange core 2; a cold end pipe 6 is provided at the bottom of the heat exchange core 2, and a cold end pipe 6 for connecting with other cold boxes is provided at the bottom of the heat exchange core 2; a plurality of connecting pipes 8 are provided on the outer wall of the shell 1, and the plurality of connecting pipes 8 are connected to the cold end pipe 6 one by one.

[0060] Specifically, the hot-end pipe 7 is used to introduce a higher-temperature fluid into the heat exchange core 2, while the cold-end pipe 6 is used to introduce a lower-temperature fluid into the heat exchange core 2. The lower-temperature fluid enters the heat exchange core 2 through the cold-end pipe 6, and the higher-temperature fluid and the lower-temperature fluid exchange heat within the heat exchange core 2. The skid-mounted heat exchanger cold box of the present invention is connected to other cold boxes only through the cold-end pipe 6, with no other external connections. This makes the overall structure relatively simple and facilitates transportation and assembly during the skid-mounted process.

[0061] Example 2

[0062] Reference Figure 1 and Figure 2This is Example 2 of a skid-mounted heat exchanger cold box of the present invention. This example differs from Example 1 in that a skirt 5 is provided at the bottom of the shell 1 and is welded to the shell 1. The skirt 5 allows the entire shell 1 to be quickly mounted on the desired surface, facilitating on-site installation of the entire cold box.

[0063] In this embodiment, a plurality of axial lifting ears 9 are provided on the housing 1 .

[0064] Specifically, four axial lifting lugs 9 are provided on the side wall of the shell 1 , which are symmetrically welded to both sides of the side wall of the shell 1 in groups of two with the axis of the shell 1 as the symmetry axis, so as to facilitate the lifting and transportation of the shell 1 .

[0065] Example 3

[0066] Reference Figure 6 , which is a skid-mounted method for the skid-mounted heat exchanger cold box in Example 2 of the present invention, comprising the following steps:

[0067] S1. The shell 1 with the top opening is adjusted to a level in the workshop;

[0068] S2. The heat exchange core 2 is placed into the shell from the top opening of the shell 1, and the heat exchange core 2 is installed and fixed in the shell 1;

[0069] S21. The heat exchange core is hoisted into the shell 1 through the opening of the shell 1;

[0070] S22. A perforation is provided on the side wall of the housing through which the support beam 4 is inserted. The support beam 4 is then inserted into the housing 1 through the perforation. The support beam 4 is secured to the lug 13 and the support beam 4 to the reinforcement ring 3 using fasteners 12. The perforation is then sealed.

[0071] S23. Connect the cold end pipe 6 to the connecting pipe 8, thus completing the installation of the heat exchange core 2 in the shell 1.

[0072] S3. The top opening of the shell 1 is closed, and then the cold end tube 6 and the hot end tube 7 are installed on the shell and connected to the heat exchange core 2;

[0073] S4. Install the connecting pipe 8 on the housing 1, connect the connecting pipe 8 to the cold end pipe 6, and then install the shaft lug 9 on the outer wall of the housing;

[0074] S5. The housing 1 is transported to the site of use and the housing 1 is rotated to a vertical position;

[0075] S6. Install the skirt 5 on the civil foundation at the desired installation location, and then fill the shell 1 with pearl sand through the manhole 15 to complete the installation.

[0076] Skid-mounted installation of skid-mounted heat exchanger cold boxes avoids constraints on site, such as weather and site conditions, which can hinder timely and quality completion. Workshop assembly is unaffected by these factors. Furthermore, given the extensive welding work and high cleanliness requirements within the cold box, workshop installation provides excellent quality control and ensures cleanliness within the piping. This significantly reduces on-site workload and ensures installation quality.

[0077] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A skid-mounted heat exchanger cold box, characterized in that: The invention comprises a cylindrical shell (1), wherein a plurality of heat exchange cores (2) are arranged in the shell (1), a plurality of reinforcement rings (3) are arranged on the inner wall of the shell (1), a plurality of support beams (4) are arranged on the heat exchange core (2), and the support beams (4) are arranged on the top of the reinforcement rings (3); a plurality of support ears (13) are provided on the heat exchange core (2), and the support ears (13) are installed on the top of the support beams (4); a waist-shaped hole (10) is provided at one end of the support beam (4), and a round hole (11) is provided at the other end, and fasteners (12) for fixing the support beam (4) to the reinforcement ring (3) are penetrated in the waist-shaped hole (10) and the round hole (11); a heat insulation plate (14) is provided between the support ear (13) and the support beam (4), and between the support beam (4) and the reinforcement ring (3); and a plurality of axial lifting ears (9) are provided on the shell (1).

2. The skid-mounted heat exchanger cold box according to claim 1, characterized in that: A manhole (15) is provided on the top of the shell (1), and a ladder (16) is provided on the heat exchange core (2).

3. The skid-mounted heat exchanger cold box according to claim 2, characterized in that: A skirt seat (5) is provided at the bottom of the shell (1).

4. The skid-mounted heat exchanger cold box according to claim 1, characterized in that: The top of the heat exchange core (2) is connected to a hot end pipe (7), and the hot end pipe (7) passes through the top of the shell (1) and is connected to the heat exchange core (2); the bottom of the heat exchange core (2) is provided with a cold end pipe (6), and the bottom of the heat exchange core (2) is provided with a cold end pipe (6) for connecting with other cold boxes; a plurality of connecting pipes (8) are provided on the outer wall of the shell (1), and the plurality of connecting pipes (8) are connected to the cold end pipes (6) in a one-to-one correspondence.

5. A skid-mounted method for a skid-mounted heat exchanger cold box according to any one of claims 1 to 4, characterized in that: The steps include: S1. Adjust the shell (1) with the top opening to a horizontal position in the workshop; S21. The heat exchange core is hoisted into the shell (1) through the opening of the shell (1); S22. A through-hole is provided on the side wall of the housing to allow the support beam (4) to pass through, and the support beam (4) is inserted into the housing (1) through the through-hole. The support beam (4) is fixed to the lug (13) and the support beam (4) to the reinforcement ring (3) using a fastener (12), and the through-hole is then sealed. S23. Connect the cold end pipe (6) to the connecting pipe (8), thus completing the installation of the heat exchange core (2) in the housing (1); S3. Close the top opening of the shell (1), then install the cold end pipe (6) and the hot end pipe (7) on the shell and connect them to the heat exchange core (2); S4. Install the connecting pipe (8) on the shell (1), connect the connecting pipe (8) to the cold end pipe (6), and then install the shaft lug (9) on the outer wall of the shell (1); S5. Transport the housing (1) to the site of use and rotate the housing (1) to a vertical position; S6. Install the skirt (5) on the civil foundation at the desired installation location, and then fill the shell (1) with pearl sand through the manhole (15) to complete the installation.

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