Cold box heat preservation device for air separation equipment

Abstract

The utility model discloses a cold box heat preservation device for air separation equipment, and relates to the technical field of heat insulation equipment, the cold box heat preservation device comprises a box body and a pipe passing hole formed in the outer surface of the box body, the interior of the box body extends to the exterior to be provided with an external pipe, the right end of the external pipe is fixedly connected with a first flange, and the right side of the external pipe is provided with a butt joint pipe; the left end of the butt joint pipe is fixedly connected with a second flange, and a heat preservation mechanism is arranged outside the box body. Compared with an existing common cold box heat preservation device for the air separation equipment, according to the cold box heat preservation device for the air separation equipment, a third flange of a heat preservation mechanism needs to be installed on a fixing base firstly, then a first flange and a second flange are in butt joint, and after the length of a pipe body is determined, a connecting gap of an outer pipe and an inner pipe needs to be welded; according to the device, the joint of the pipe body can be still located in the internal environment of the cold box, the disassembling and sealing functions are achieved, the protection effect on the joint of the pipe body is achieved, and meanwhile the limitation of additional installation can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat insulation equipment, in particular to a cold box heat preservation device for air separation equipment. Background Art

[0002] In the process of transporting cryogenic gases (liquid nitrogen, liquid oxygen, etc.), in order to prevent the loss of performance due to absorption of external heat in the transport pipeline, it is usually necessary to arrange the transport pipeline in an air separation cold box. Pearlescent sand is provided in the air separation cold box, which can effectively block the heat exchange between the cryogenic gas and the outside world and play a good role in keeping cold.

[0003] For example, the air separation cold box insulation device with application number 201720572460.0 ensures that the nitrogen concentration filled in the insulation shell is consistent, preventing outside air from entering the insulation shell and causing the pearl sand to "get damp" and reduce the insulation performance, which has good application prospects. However, like the traditional device, the device has the phenomenon of cold leakage at the pipe connection.

[0004] For example, the anti-frost insulation structure at the connection of the cold box plate of the air separation equipment with application number 201921143838.0, through this structure, the pearl sand in the cold box can smoothly enter the insulation structure through the small hole, and the attached zipper leather cover also solves the maintenance problem that may occur in the peripheral vacuum tube. Although this device can solve the problem of cold leakage at the connection, it cannot be disassembled after welding, and the installation limitation is high.

[0005] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a cold box insulation device for air separation equipment is proposed. Utility Model Content

[0006] The utility model aims to provide a cold box insulation device for air separation equipment to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cold box insulation device for an air separation device, comprising a box body and a pipe running hole opened on the outer surface of the box body, an external pipe is provided from the inside of the box body to the outside, a first flange is fixedly connected to the right end of the external pipe, a butt pipe is provided on the right side of the external pipe, a second flange is fixedly connected to the left end of the butt pipe, and an insulation mechanism is provided on the outside of the box body.

[0008] Preferably, the heat preservation mechanism includes an inner tube arranged outside the box body, the outer part of the inner tube is slidably connected to the outer tube, the outer circular surface of the outer tube is provided with a maintenance door, and the inner surface of the maintenance door is provided with a sealing gasket, and the left end of the inner tube is provided with a connecting mechanism.

[0009] Preferably, the right end of the inner tube is fixedly connected with an anti-slip ring, and the inner circular surface of the outer tube is provided with a limiting groove.

[0010] Preferably, the connection mechanism comprises a third flange fixedly connected to the left end of the inner tube, a fixing seat is welded on the outer surface of the box body, and a first ring gasket is arranged inside the fixing seat.

[0011] Preferably, a fourth flange is welded to the outer circumferential surface of the butt tube, and a fifth flange is fixedly connected to the right end of the outer tube.

[0012] Preferably, a second gasket is provided between the fourth flange and the fifth flange, and a third gasket is provided between the first flange and the second flange.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model can make the pipe body connection still in the environment inside the cold box through the arrangement of the box body, the pipe hole, the external pipe, the first flange, the butt pipe, the second flange, the insulation mechanism, the inner pipe, the outer pipe, the maintenance door, the connection mechanism, the third flange, the fixing seat, the first ring gasket, the anti-slip ring, the limit groove, the fourth flange, and the fifth flange. The device can meet the disassembly and sealing functions, protect the pipe body connection and reduce the limitation of installation;

[0015] 2. The utility model provides the second ring gasket and the third ring gasket, which can improve the sealing performance of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0017] Figure 2 For this utility model Figure 1 Schematic diagram of the local structure;

[0018] Figure 3 For this utility model Figure 2 Schematic diagram of the partial structure of ;

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the connection between the inner tube 71 and the outer tube 72 of the utility model.

[0020] In the figure: 1. box body; 2. pipe hole; 3. external pipe; 4. first flange; 5. butt pipe; 6. second flange; 7. insulation mechanism; 71. inner pipe; 72. outer pipe; 73. maintenance door; 74. connecting mechanism; 741. third flange; 742. fixing seat; 743. first gasket; 8. anti-slip ring; 9. limiting groove; 10. fourth flange; 11. fifth flange; 12. second gasket; 13. third gasket. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-Figure 4 As shown, a cold box insulation device for an air separation device comprises a box body 1 and a pipe hole 2 opened on the outer surface of the box body 1, an external pipe 3 is arranged extending from the inside of the box body 1 to the outside, a first flange 4 is fixedly connected to the right end of the external pipe 3, a butt pipe 5 is arranged on the right side of the external pipe 3, a second flange 6 is fixedly connected to the left end of the butt pipe 5, an insulation mechanism 7 is arranged on the outside of the box body 1, the insulation mechanism 7 comprises an inner tube 71 arranged on the outside of the box body 1, an outer tube 72 is slidably connected to the outside of the inner tube 71, a maintenance door 73 is arranged on the outer circumferential surface of the outer tube 72, and a sealing gasket is arranged on the inner surface of the maintenance door 73, a connecting mechanism 74 is arranged on the left end of the inner tube 71, the maintenance door 73 facilitates maintenance of the inside of the insulation mechanism 7, an anti-slip ring 8 is fixedly connected to the right end of the inner tube 71, a limiting groove 9 is arranged on the inner circumferential surface of the outer tube 72, and the connecting mechanism 74 comprises a third flange fixedly connected to the left end of the inner tube 71 741, a fixing seat 742 is welded on the outer surface of the box body 1, a first ring gasket 743 is arranged inside the fixing seat 742, the third flange 741 is fixedly connected to the fixing seat 742 by bolts, the first ring gasket 743 can improve the sealing between the third flange 741 and the fixing seat 742, a fourth flange 10 is welded on the outer cylindrical surface of the butt pipe 5, and a fifth flange 11 is fixedly connected to the right end of the outer tube 72. Before the first flange 4 and the second flange 6 are butt-jointed, the third flange 741 of the insulation mechanism 7 is first installed on the fixing seat 742, the first flange 4 and the second flange 6 are butt-jointed, and the fifth flange 11 is installed on the fourth flange 10. During the sliding process of the outer tube 72 outside the inner tube 71, the anti-slip ring 8 slides inside the limiting groove 9 to prevent the outer tube 72 from slipping off the inner tube 71. After determining the length of the tube body, the connection gap between the outer tube 72 and the inner tube 71 needs to be welded to ensure its sealing.

[0023] like Figure 1-Figure 3 As shown, a second gasket 12 is provided between the fourth flange 10 and the fifth flange 11 , and a third gasket 13 is provided between the first flange 4 and the second flange 6 . The second gasket 12 can improve the sealing performance of the fourth flange 10 and the fifth flange 11 .

[0024] Working principle: when using the cold box insulation device for air separation equipment, first, before connecting the first flange 4 and the second flange 6, the third flange 741 of the insulation mechanism 7 is installed on the fixed seat 742, the first flange 4 and the second flange 6 are connected, and the fifth flange 11 is installed on the fourth flange 10. During the sliding process of the outer tube 72 outside the inner tube 71, the anti-slip ring 8 slides inside the limiting groove 9 to prevent the outer tube 72 and the inner tube 71 from slipping. After determining the length of the tube body, it is necessary to weld the connection gap between the outer tube 72 and the inner tube 71 to ensure its sealing. The second gasket 12 and the third gasket 13 can improve the sealing of the connection. This is the working principle of the cold box insulation device for air separation equipment.

Claims

1. A cold box heat preservation device for an air separation plant, comprising a box body (1) and a pipe hole (2) opened on the outer surface of the box body (1), characterized in that: An external pipe (3) is provided extending from the interior of the box body (1) to the exterior, the right end of the external pipe (3) is fixedly connected to a first flange (4), a butt pipe (5) is provided on the right side of the external pipe (3), the left end of the butt pipe (5) is fixedly connected to a second flange (6), a heat preservation mechanism (7) is provided on the exterior of the box body (1), the heat preservation mechanism (7) comprises an inner pipe (71) provided on the exterior of the box body (1), the exterior of the inner pipe (71) is slidably connected to an outer pipe (72), a maintenance door (73) is provided on the outer circumferential surface of the outer pipe (72), and the inner surface of the maintenance door (73) is provided with A sealing gasket, wherein a connecting mechanism (74) is provided at the left end of the inner tube (71), an anti-slip ring (8) is fixedly connected to the right end of the inner tube (71), a limiting groove (9) is provided on the inner circumferential surface of the outer tube (72), the connecting mechanism (74) comprises a third flange (741) fixedly connected to the left end of the inner tube (71), a fixing seat (742) is welded to the outer surface of the box body (1), a first ring gasket (743) is provided inside the fixing seat (742), a fourth flange (10) is welded to the outer circumferential surface of the butt tube (5), and a fifth flange (11) is fixedly connected to the right end of the outer tube (72).

2. The cold box insulation device for air separation equipment according to claim 1, characterized in that: A second ring gasket (12) is arranged between the fourth flange (10) and the fifth flange (11), and a third ring gasket (13) is arranged between the first flange (4) and the second flange (6).

Images