Low-temperature supporting structure for cryogenic CO-making cold box in natural gas-to-ethylene glycol device

Abstract

The utility model belongs to the technical field of cryogenic separation equipment, and particularly relates to a low-temperature supporting structure for a cryogenic CO cold box in a natural gas-to-ethylene glycol device, which comprises a foundation slab and an equipment supporting assembly which are arranged in a box body, and the equipment supporting assembly comprises a plurality of supporting ring pipes and supporting lugs corresponding to the supporting ring pipes. The supporting lug is arranged at the top end of the supporting ring pipe, a cold insulation assembly is arranged between the bottom end of the supporting ring pipe and the foundation bottom plate, a plurality of heat insulation skylights are formed in the supporting ring pipe in the axial direction, and the supporting ring pipe and the box body are both filled with pearlife. According to the utility model, the heat insulation skylight effectively reduces the loss of cold energy conducted by metal, the pearlife in the support ring pipe effectively blocks the loss of cold energy conducted by convection, and the design of the cold insulation component further avoids direct contact between the support ring pipe and the foundation slab, so that the formation of a cold bridge is prevented, and the cold brittleness of the foundation slab is avoided; and safe operation of equipment is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of cryogenic separation equipment, specifically relating to a low-temperature support structure for a cryogenic CO production cold box in a natural gas to ethylene glycol plant. Background Technology

[0002] Natural gas, used as feedstock, is compressed and desulfurized before being sent to a natural gas conversion unit. This unit uses pure oxygen conversion technology to produce syngas. After CO2 removal via the MDEA process, the syngas enters a cryogenic separation unit and a PSA (Pressure Swing Adsorption) unit to separate CO and H2, which are then used as feedstock for the dimethyl oxalate and ethylene glycol units. The cryogenic CO production cold box typically integrates equipment such as distillation columns, heat exchangers, and gas-liquid separators, along with supporting structures, within a single enclosure. The various components are connected by pipes. Currently, the traditional support structure uses support rings, which create cold bridges by directly contacting the base plate, resulting in a 3-5% loss of cooling capacity. Furthermore, the low temperature at the bottom of the cold box leads to brittleness in the steel base plate over extended periods, reducing its impact toughness by more than 40% and affecting the safe operation of the cold box. Therefore, it is necessary to modify the traditional support structure within the cold box. Utility Model Content

[0003] The present invention aims to provide a low-temperature support structure for the cryogenic CO production cold box in a natural gas to ethylene glycol plant, in order to solve the problems of cold bridges formed by direct contact between the traditional support structure and the foundation plate, resulting in large cold loss and cold brittleness of the foundation plate.

[0004] To achieve the above objectives, the present invention provides a cryogenic support structure for a cryogenic CO production cold box in a natural gas-to-ethylene glycol plant, comprising a base plate and an equipment support assembly disposed inside the box. The equipment support assembly includes several support ring pipes and corresponding lugs. The lugs are located at the top of the support ring pipes. A cold insulation assembly is provided between the bottom of the support ring pipes and the base plate. Several heat-insulating skylights are provided along the axial direction of the support ring pipes. The support ring pipes and the box body are filled with perlite.

[0005] The working principle and beneficial effects of this solution are as follows: Insulating windows are created on the support ring pipe to effectively reduce heat loss through metal conduction; perlite is filled inside the support ring pipe to effectively block heat loss through convection; and a cold insulation component is designed between the bottom of the support ring pipe and the foundation plate to prevent direct contact between them, thus preventing cold bridge formation, avoiding embrittlement of the foundation plate, and ensuring safe equipment operation. In summary, this solution effectively solves the problems of significant heat loss due to cold bridges formed by direct contact between the traditional support structure and the foundation plate, as well as the problem of embrittlement of the foundation plate.

[0006] Optionally, a cold insulation component is also provided between the support ring tube and the corresponding support lug.

[0007] In this design, the support lugs are directly connected to the supported equipment, such as a distillation column. The design of the insulation components effectively prevents the support lugs from directly contacting the support ring pipe, thereby further blocking the loss of cold energy through metal conduction.

[0008] Optionally, the cold insulation component includes a stainless steel substrate, a ceramic fiber plate, and a graphene-reinforced gasket, with the graphene-reinforced gasket in contact with the support ring tube.

[0009] In this solution, the ceramic fiber board is positioned between the stainless steel substrate and the graphene-reinforced gasket, thus protecting the ceramic fiber board and ensuring that it can effectively perform its insulation function.

[0010] Optionally, the low-temperature support structure further includes a pipe support assembly, which includes a transverse support pipe disposed outside the pipe and a number of pipe clamps for supporting the transverse support pipe. A fluororubber pad and an insulation layer are provided between the transverse support pipe and the pipe, with the insulation layer located between the fluororubber pad and the pipe.

[0011] In this solution, pipe support components are used to support the pipes inside the box. Furthermore, the fluororubber padding layer effectively isolates the pipes from the horizontal support pipes, preventing direct contact between the pipes and the horizontal support pipes, thereby reducing heat loss. In addition, the insulation layer can also reduce heat loss from the pipes.

[0012] Optionally, the pipe clamp includes a clamp and a vertical pipe fixedly connected to the clamp, the vertical pipe being filled with perlite.

[0013] In this design, the perlite filling the vertical pipe effectively prevents the loss of cold energy through convection.

[0014] Optionally, the cryogenic support structure further includes a nitrogen inlet pipe and a nitrogen outlet pipe. The outlet port of the nitrogen inlet pipe enters the chamber from the top of the chamber and stops at the bottom of the chamber. The nitrogen outlet pipe is connected to the chamber, and the inlet port of the nitrogen outlet pipe is located above the outlet port of the nitrogen inlet pipe. A breathing valve is installed on the nitrogen outlet pipe.

[0015] In this solution, when the temperature at the bottom of the chamber is too low, nitrogen is supplied into the chamber through the nitrogen inlet pipe. After absorbing the cold energy, the temperature of the nitrogen decreases. When the positive pressure inside the chamber reaches the opening pressure of the breather valve, the breather valve opens, and the cold nitrogen is discharged through the nitrogen outlet pipe, thereby carrying away the cold energy and causing the temperature at the bottom of the chamber to rise, thus preventing the bottom of the chamber from becoming too cold and affecting the safe operation of the equipment.

[0016] Optionally, the outer periphery of the support ring tube is wrapped with a plastic mesh or nano-aerogel felt to prevent the perlite inside the support ring tube from leaking out through the heat insulation skylight.

[0017] In this design, the plastic mesh and nano-aerogel felt have low thermal conductivity, which can prevent the perlite inside the support ring tube from leaking out through the insulation skylight and reduce the cold loss of the support ring tube. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the low-temperature support structure for a cryogenic CO production cold box in a natural gas-to-ethylene glycol apparatus according to Embodiment 1 of this utility model;

[0019] Figure 2 This is a radial partial sectional view of the pipe support assembly in Embodiment 1 of this utility model;

[0020] Figure 3 This is a radial sectional view of the pipe support assembly in Embodiment 2 of this utility model;

[0021] Figure 4 This is a schematic diagram of the low-temperature support structure for the cryogenic CO production cold box in a natural gas to ethylene glycol apparatus according to Embodiment 3 of this utility model. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The markings in the accompanying drawings include: 1. Box body; 2. Foundation plate; 3. Distillation column; 4. Pipe; 5. Support ring pipe; 5. Insulated skylight; 6. Support lug; 7. Cold insulation component; 7. 304 stainless steel substrate; 701. Ceramic fiber board; 702. Graphene reinforced gasket; 703. Perlite; 8. Nano aerogel felt; 9. Horizontal support pipe; 10. Pipe clamp; 11. Clamp; 1101. Vertical pipe; 1102. Fluororubber pad; 12. Insulation layer; 13. Nitrogen inlet pipe; 14. Nitrogen outlet pipe; 15. Breathing valve; 16.

[0024] Example 1

[0025] This embodiment is basically as follows: Figure 1 and Figure 2As shown: A cryogenic support structure for a cryogenic CO production cold box in a natural gas to ethylene glycol plant includes a base plate 2, equipment support components, and pipeline support components installed inside the box body 1. The equipment support components are used to support equipment such as distillation columns 3, heat exchangers, and gas-liquid separators, while the pipeline support components are used to support pipelines 4 connecting the various devices. The equipment support assembly includes several support ring tubes 5 and corresponding lugs 6. A cold insulation component 7 is provided between the top end of the support ring tube 5 and the corresponding lug 6, and between the bottom end of the support ring tube 5 and the base plate 2. The cold insulation component 7 includes a 304 stainless steel substrate 701, a ceramic fiber board 702, and a graphene-reinforced gasket 703, with the graphene-reinforced gasket 703 in contact with the support ring tube 5. Specifically, the cold insulation component 7 at the top end of the support ring tube 5 consists of, from top to bottom, a 304 stainless steel substrate 701, a ceramic fiber board 702, and a graphene-reinforced gasket 703; the cold insulation component 7 at the bottom end of the support ring tube 5 consists of, from top to bottom, a graphene-reinforced gasket 703, a ceramic fiber board 702, and a 304 stainless steel substrate 701. In this way, the cold insulation component 7 effectively isolates direct contact between metals, thereby effectively preventing heat loss through metal conduction. In this embodiment, taking the support of the distillation column 3 as an example, there are four support ring tubes 5. The four support ring tubes 5 are evenly distributed around the circumference of the distillation column 3. One end of the support lug 6 is welded to the outer wall of the distillation column 3, and the other end of the support lug 6 is placed on the 304 stainless steel substrate 701 of the cold insulation component 7 located at the top of the support ring tube 5.

[0026] The support ring pipe 5 has several heat-insulating skylights 501 opened along the axial direction. Both the support ring pipe 5 and the box body 1 are filled with perlite 8 (the perlite in the box body 1 is not shown). Figure 1 In this embodiment, the space between the filling device and the housing 1, and between the pipe 4 and the housing 1, is filled with a plastic mesh or nano-aerogel felt 9 wrapped around the outer peripheral wall of the support ring pipe 5 to prevent the perlite 8 inside the support ring pipe 5 from leaking out through the thermal insulation window 501. In this embodiment, the nano-aerogel felt 9 is wrapped around the outer peripheral wall of the support ring pipe 5 and secured with ropes or cable ties. This prevents the perlite 8 inside the support ring pipe 5 from leaking out and reduces cold loss. In addition, the number and specifications of the thermal insulation windows 501 are designed to ensure the safe use of the support ring pipe 5.

[0027] The pipe support assembly includes a transverse support pipe 10 disposed outside the pipe 4 and several pipe clamps 11 for supporting the transverse support pipe 10. A fluororubber pad 12 and an insulation layer 13 are provided between the transverse support pipe 10 and the pipe 4, with the insulation layer 13 located between the fluororubber pad 12 and the pipe 4. In this embodiment, there are two pipe clamps 11, distributed at both ends of the transverse support pipe 10. The insulation layer 13 is made of nano-aerogel felt or polyurethane, and the insulation layer 13 completely wraps around the pipe 4, thereby reducing the cold loss of the pipe 4. The pipe clamp 11 includes a clamp 1101 and a vertical pipe 1102 welded to the clamp 1101, with the bottom end of the vertical pipe 1102 abutting against the foundation plate 2.

[0028] In this embodiment, the space between the equipment, pipes 4, and housing 1 is filled with perlite 8, thereby reducing the loss of cold energy from the equipment to the outside atmosphere. In the equipment support assembly, the insulating skylight 501 on the support ring pipe 5 reduces the metal conduction area, thus reducing cold energy loss through metal conduction; the perlite 8 cooling material filling the support ring pipe 5 effectively blocks cold energy loss through convection conduction; cold insulation components 7 are installed at both the top and bottom of the support ring pipe 5, thereby isolating the support ring pipe 5 from the lugs 6 and from the foundation plate 2, preventing the foundation plate 2 from becoming brittle and ensuring safe equipment operation. Furthermore, this embodiment utilizes pipe support assemblies to support the pipes 4 within the housing 1, thereby sharing the load-bearing pressure of the equipment support assembly; and the insulation layer 13 in the pipe support assembly effectively reduces cold energy loss, while the fluororubber padding layer 12 effectively isolates the pipes 4 from the transverse support pipes 10, thereby reducing cold energy conduction.

[0029] In summary, due to the low temperature at the bottom of the housing 1, prolonged operation can lead to brittleness of the foundation plate 2, causing damage and affecting the safe operation of the cryogenic device. Therefore, this embodiment reduces cold conduction by opening an insulating skylight 501, adding a cold insulation component 7, and filling with perlite 8, thereby preventing the foundation plate 2 from becoming brittle and affecting the safe operation of the equipment. Furthermore, nano-aerogel felt 9 is wrapped around the outer wall of the pipe 4 and the outer wall of the support ring pipe 5 to effectively reduce cold loss and achieve the purpose of energy saving and consumption reduction.

[0030] Example 2

[0031] The difference between this embodiment and Embodiment 1 is that: Figure 3 As shown, in this embodiment, the vertical pipe 1102 of the pipe clamp 11 is filled with perlite 8, so that the perlite 8 can prevent the cold energy in the vertical pipe 1102 from being lost through convection conduction.

[0032] Example 3

[0033] The difference between this embodiment and Embodiment 1 is that: Figure 4As shown, the cryogenic support structure in this embodiment also includes a nitrogen inlet pipe 14 and a nitrogen outlet pipe 15. The outlet port of the nitrogen inlet pipe 14 enters the box 1 from the top of the box 1 and stops at the bottom of the box 1. The nitrogen outlet pipe 15 is connected to the box 1, and the inlet port of the nitrogen outlet pipe 15 is located above the outlet port of the nitrogen inlet pipe 14. A breathing valve 16 is installed on the nitrogen outlet pipe 15. Figure 4 The middle arrow indicates the direction of nitrogen flow.

[0034] In this embodiment, when the temperature at the bottom of the chamber 1 is too low, nitrogen (at room temperature) enters the chamber 1 through the nitrogen inlet pipe 14. The nitrogen absorbs the cold energy and its temperature decreases. Subsequently, when the positive pressure inside the chamber 1 reaches the opening pressure of the breather valve 16, the breather valve 16 opens, and the cold nitrogen is discharged through the nitrogen outlet pipe 15, thereby taking away the cold energy and causing the temperature at the bottom of the chamber 1 to rise, thus preventing the bottom of the chamber 1 from becoming too cold and affecting the safe operation of the equipment.

[0035] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness or practicality of this utility model. The specific embodiments described in the specification can be used to interpret the claims.

Claims

1. A cryogenic support structure for a cryogenic CO production cold box in a natural gas-to-ethylene glycol plant, comprising a foundation plate and an equipment support assembly disposed inside the box body, the equipment support assembly comprising a plurality of support ring pipes and corresponding lugs to the support ring pipes, the lugs being disposed at the top ends of the support ring pipes, characterized in that: A cold insulation component is provided between the bottom end of the support ring tube and the foundation plate. Several heat insulation skylights are opened along the axial direction of the support ring tube. The support ring tube and the box body are filled with perlite.

2. The cryogenic support structure for the cryogenic CO production cold box in the natural gas to ethylene glycol unit according to claim 1, characterized in that: A cold insulation component is also provided between the support ring tube and the corresponding support lug.

3. The cryogenic support structure for the cryogenic CO production cold box in a natural gas-to-ethylene glycol plant according to claim 1 or 2, characterized in that: The cold insulation component includes a stainless steel substrate, a ceramic fiber board, and a graphene-reinforced gasket, with the graphene-reinforced gasket in contact with the support ring tube.

4. The cryogenic support structure for the cryogenic CO production cold box in the natural gas to ethylene glycol unit according to claim 1, characterized in that: The low-temperature support structure also includes a pipe support assembly, which includes a transverse support pipe located outside the pipe and several pipe clamps for supporting the transverse support pipe. A fluororubber pad and an insulation layer are provided between the transverse support pipe and the pipe, with the insulation layer located between the fluororubber pad and the pipe.

5. The cryogenic support structure for the cryogenic CO production cold box in the natural gas to ethylene glycol unit according to claim 4, characterized in that: The pipe clamp includes a clamp and a vertical pipe fixedly connected to the clamp, and the vertical pipe is filled with perlite.

6. The cryogenic support structure for the cryogenic CO production cold box in a natural gas-to-ethylene glycol plant according to claim 1 or 4, characterized in that: The cryogenic support structure also includes a nitrogen inlet pipe and a nitrogen outlet pipe. The outlet port of the nitrogen inlet pipe enters the chamber from the top of the chamber and stops at the bottom of the chamber. The nitrogen outlet pipe is connected to the chamber, and the inlet port of the nitrogen outlet pipe is located above the outlet port of the nitrogen inlet pipe. A breathing valve is installed on the nitrogen outlet pipe.

7. The cryogenic support structure for the cryogenic CO production cold box in the natural gas to ethylene glycol unit according to claim 1, characterized in that: The outer circumference of the support ring tube is wrapped with a plastic mesh or nano aerogel felt to prevent the perlite inside the support ring tube from leaking out through the heat insulation skylight.

Images