Online repairing device for cold insulation layer of cryogenic pipeline
By designing an online repair device for cold-proofing layer of deep-cold pipes including sleeves, purge mechanisms, sliding support mechanisms and winding mechanisms, the shortcomings of the aging of cold-proofing layer of deep-cold pipes and traditional repair methods are solved, and efficient and energy-saving online repair results are achieved, and the quality and safety of repairs are improved.
Patent Information
- Application Number
- CN202421742125.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The cold-retaining layer of deep-cooled pipe aging, cracking or damage in long-term low-temperature environments and temperature fluctuations, resulting in a decrease in cooling performance and increasing heat loss, safety hazards and equipment damage. Traditional repair methods require shutdown operations, which affects normal operation, and the online repair process has problems such as large nitrogen usage, high construction costs and construction quality.
A deep-cooled pipe cold-proof layer online repair device is designed, including a sleeve, a purge mechanism, a sliding support mechanism and a winding mechanism. By purging and wrapping the cooling material in the sleeve, a positive pressure environment is formed, external wet air is avoided, deicing efficiency is improved, the amount of dry gas is saved, and the cooling layer is initially coated under the protection of a dry atmosphere.
It realizes efficient repair of the cold-proof layer of deep-cold pipes without stopping the pipeline operation, improves the deicing efficiency, saves the amount of dry gas, and improves the quality of repair, avoids rapid frost and equipment damage.
Smart Images
Figure CN222992525U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cryogenic insulation layer repair for liquefied natural gas pipelines, and particularly relates to an on-line repair device for cryogenic pipeline insulation layers. Background Art
[0002] In order to ensure the low-temperature environment in the natural gas receiving station, the insulation layer of the cryogenic pipeline plays a crucial role. The insulation layer can effectively block heat from entering the pipeline and ensure the stable existence of natural gas in the cryogenic environment.
[0003] However, during the operation of the natural gas receiving station, the insulation layer of the cryogenic pipeline often faces many challenges. The long-term low-temperature environment and frequent temperature fluctuations are likely to cause the insulation layer material to age, crack or be damaged. In addition, external environmental factors such as mechanical collision and corrosion will also damage the insulation layer. Once the insulation layer fails, the insulation performance of the natural gas pipeline will drop significantly, resulting in the following hazards: First, increased heat loss: The failure of the insulation layer will cause a large amount of external heat to enter the pipeline, increasing the evaporation rate of natural gas, and thus leading to energy waste and economic losses. Second, safety hazards: The damage of the insulation layer may cause frosting or even freezing and cracking on the pipeline surface. In severe cases, it may cause natural gas leakage, resulting in safety accidents such as fires or explosions. Third, equipment damage: The failure of the insulation layer will generate excessive temperature difference stress on the pipeline and its attached equipment, increasing the failure rate and maintenance cost of the equipment.
[0004] Traditional insulation layer repair methods require shutdown operations, which not only seriously affect the normal operation of the natural gas receiving station, but also have a short construction window period and it is difficult to guarantee the repair quality. At present, the on-line repair process for the cryogenic pipeline insulation layer includes removing the old insulation layer, knocking off large pieces of ice with a hammer, purging with nitrogen to remove residual ice, and quickly wrapping the insulation material. There are disadvantages such as a large amount of nitrogen consumption, high construction cost, and rapid icing after losing nitrogen protection, which affects the construction quality.
[0005] Therefore, a device capable of on-line repairing the insulation layer of liquefied natural gas pipelines has become the key to solving the problem. Summary of the Utility Model
[0006] The purpose of the utility model is to provide an on-line repair device for cryogenic pipeline insulation layers. The beneficial effect of the utility model is that dry gas purging and winding of the insulation material are carried out inside the sleeve, avoiding the entry of external wet air and sublimation on the surface of the liquefied natural gas pipeline, improving the de-icing efficiency of the dry gas, and saving the consumption of dry gas.
[0007] To achieve the above purpose, the utility model adopts the following technical solutions, including:
[0008] A sleeve, which has a cylindrical structure and is used to cover the outer periphery of the liquefied natural gas pipeline;
[0009] A purging mechanism, which is arranged inside the sleeve and used to connect with a dry gas source to purge the liquefied natural gas pipeline, so that the thin ice sublimes rapidly;
[0010] Multiple sliding support mechanisms, which are arranged inside the sleeve and located behind the purging mechanism, are used to slidably support the sleeve, so that the sleeve can slide along the liquefied natural gas pipeline;
[0011] A winding mechanism, which is rotatably arranged at the rear end of the sleeve and used to wind the cold insulation material on the liquefied natural gas pipeline;
[0012] Among them, the sliding support mechanism includes;
[0013] Multiple fixing bolts, which are evenly distributed along the circumference on the inner wall of the sleeve, and connection rings are arranged at the ends of the fixing bolts;
[0014] Multiple support frames, one end of which is hinged to the middle of the fixing bolt, and the other end is provided with sliding wheels;
[0015] Multiple adjusting rods, the ends of which are hinged to the middle of the support frame, the upper ends of the adjusting rods pass through the connection rings, and external threads are arranged on the adjusting rods;
[0016] Multiple adjusting nuts, which are respectively sleeved on the adjusting rods and are adapted to the external threads, and are used to adjust the slope of the adjusting rods so as to adapt to the outer circumference of the liquefied natural gas pipeline;
[0017] The fixing bolts, support frames and adjusting rods correspond one by one.
[0018] Preferably, the sleeve is composed of a pair of relatively buckled first half shells, and the pair of first half shells are connected by buckles.
[0019] Preferably, the purging mechanism is composed of a pair of relatively arranged purging frames, and the purging frames are respectively arranged inside the first half shells;
[0020] Among them, the purging frame includes;
[0021] Multiple semicircular pipelines, which are equidistantly arranged inside the first half shell along the length direction of the first half shell, and multiple nozzles are evenly arranged on the semicircular pipelines, and the ends of the semicircular pipelines are sealed;
[0022] A main pipe, which sequentially communicates with the middle parts of multiple semicircular pipelines, and the starting end of the main pipe is connected with a dry gas source through a hose.
[0023] Preferably, the multiple semicircular pipelines are 3 in number.
[0024] Preferably, the winding mechanism includes:
[0025] The hopper-shaped body, whose starting end is rotatably connected to the end of the sleeve, and the rear part of the hopper-shaped body gradually converges inward;
[0026] The reel holder, which is arranged on the outer periphery of the hopper-shaped body and is used for suspending the cold insulation material reel;
[0027] The opening, which is arranged on the hopper-shaped body and is used for allowing the cold insulation material to enter the hopper-shaped body.
[0028] Preferably, it further includes:
[0029] The limit ring groove, which is arranged on the inner periphery of the starting end of the hopper-shaped body;
[0030] A plurality of limit sliders, which are respectively arranged on the outer periphery of the sleeve along the circumference and are adapted to the limit ring groove, and are used to realize the rotatable connection between the hopper-shaped body and the end of the sleeve.
[0031] Preferably, the hopper-shaped body is composed of a pair of second half shells that are buckled opposite to each other, and the pair of second half shells are connected by a buckle.
[0032] Preferably, it further includes:
[0033] A plurality of rotating handles, which are evenly distributed along the circumference on the outer periphery of the hopper-shaped body and are used for facilitating rotation.
[0034] Preferably, the plurality of sets of sliding support mechanisms are 2 sets, and each set of sliding support mechanisms is provided with 3 fixing bolts, 3 support frames and 3 adjusting rods.
[0035] Preferably, the adjusting nut is a butterfly nut.
[0036] The beneficial effects of the present invention are as follows: Dry gas is purged inside the sleeve, a positive pressure environment is formed in the annular space between the sleeve and the liquefied natural gas pipeline, preventing external humid air from entering and sublimating on the surface of the liquefied natural gas pipeline, improving the ice removal efficiency of the dry gas and saving the consumption of dry gas; A winding mechanism is provided at the tail of the sleeve, which can realize the preliminary coating of the cold insulation layer on the liquefied natural gas pipeline after ice removal under the protection of a dry atmosphere, preventing the liquefied natural gas pipeline from quickly frosting after ice removal when entering a humid air environment, leaving an operation time for subsequent coating of the cold insulation material and improving the repair quality of the cold insulation layer. Description of the Drawings
[0037] Figure 1 It is a perspective view of an on-line repair device for the cold insulation layer of a cryogenic pipeline of the present invention.
[0038] Figure 2 It is a perspective sectional view of an on-line repair device for the cold insulation layer of a cryogenic pipeline of the present invention.
[0039] Figure 3 It is a perspective view of the sleeve in the present invention.
[0040] Figure 4 This is a perspective view of the purging mechanism in the present utility model.
[0041] Figure 5 This is a perspective view of the sliding support mechanism in the present utility model.
[0042] Figure 6 This is a perspective view of the winding mechanism in the present utility model. Detailed implementation manners
[0043] The following further describes the utility model in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the text of the specification.
[0044] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or other elements or their combinations.
[0045] As Figure 1-6 shown, an on-line repair device 1 for the cryogenic pipeline insulation layer of the present utility model includes:
[0046] A sleeve 110, which has a cylindrical tubular structure and is used to cover the outer periphery of the liquefied natural gas pipeline 2. As a preference, the sleeve 110 is composed of a pair of relatively buckled first half shells 111, and the pair of first half shells are connected by a buckle 112.
[0047] A purging mechanism 120, which is arranged in the sleeve 110 and is used to connect with a dry gas source to purge the liquefied natural gas pipeline, so that the thin ice quickly sublimes. As a preference, the purging mechanism 120 is composed of a pair of relatively arranged purging frames, and the purging frames are respectively arranged in the first half shell 111; wherein, the purging frame includes: multiple semicircular pipelines 121, which are equidistantly arranged along the length direction of the first half shell 111 in the first half shell 111, and a plurality of nozzles 122 are evenly arranged on the semicircular pipeline 121, and the end of the semicircular pipeline 121 is sealed; a main pipe 123, which sequentially communicates with the middle parts of the multiple semicircular pipelines 121, and the starting end of the main pipe 123 is connected with the dry gas source through a hose. As a further preference, the multiple semicircular pipelines 121 are 3 in number.
[0048] A plurality of sliding support mechanisms 130 are provided inside the sleeve 110 and behind the purging mechanism 120 for slidably supporting the sleeve 110 so that the sleeve 110 can slide along the liquefied natural gas pipeline. As a preference, the sliding support mechanism 130 includes: a plurality of fixing bolts 131 evenly arranged along the circumference on the inner wall of the sleeve 110, with a connecting ring 132 provided at the end of the fixing bolt 131; a plurality of support frames 133, one end of which is hinged to the middle of the fixing bolt 131 and the other end is provided with a sliding wheel 134; a plurality of adjusting rods 135, the ends of which are hinged to the middle of the support frame 133, the upper end of the adjusting rod 135 passes through the connecting ring 132, and external threads are provided on the adjusting rod 135; a plurality of adjusting nuts 136 sleeved on the adjusting rods respectively and adapted to the external threads for adjusting the slope of the adjusting rod 135 to adapt to the outer circumference of the liquefied natural gas pipeline 2; the fixing bolts 131, the support frames 133 and the adjusting rods 135 are in one-to-one correspondence. As a further preference, the plurality of sliding support mechanisms 130 are two groups, and each group of sliding support mechanisms 130 is provided with 4 fixing bolts 131, 4 support frames 133 and 4 adjusting rods 135. The adjusting nut 136 is a wing nut.
[0049] A winding mechanism 140 is rotatably provided at the rear end of the sleeve 110 for winding the cold insulation material 3 on the liquefied natural gas pipeline 2. As a preference, a hopper-shaped body 141, the starting end of which is rotatably connected to the end of the sleeve 110, and the rear part of the hopper-shaped body 141 gradually converges inward; a reel holder 142 provided on the outer circumference of the hopper-shaped body 141 for suspending the cold insulation material reel; an opening 143 provided on the hopper-shaped body 141 for allowing the cold insulation material to enter the hopper-shaped body 141. As a further preference, it further includes: a limit ring groove 151 provided on the inner circumference of the starting end of the hopper-shaped body 141; a plurality of limit sliders 152 respectively arranged along the circumference on the outer circumference of the sleeve 110 and adapted to the limit ring groove 151 for realizing the rotatable connection between the hopper-shaped body 141 and the end of the sleeve 110. As a further preference, the hopper-shaped body 141 is composed of a pair of relatively buckled second half shells 141a, and the pair of second half shells 141a are connected by a buckle 141b.
[0050] During use, first determine the liquefied natural gas pipeline 2 to be repaired for the cold insulation layer. Remove the cold insulation layer at one end of the liquefied natural gas pipeline 2, and knock off large ice lumps by hitting with a hammer. Adjust the adjusting nut 136 and the adjusting rod 135 according to the outer diameter of the liquefied natural gas pipeline 2 so that the liquefied natural gas pipeline 2 is located in the middle of the installed sleeve 110. Install the sleeve 110 and the winding device 140 on the liquefied natural gas pipeline 2 after the preliminary ice removal treatment. Connect the dry gas source and the purging mechanism 120 with a hose to purge the area to be treated. According to the situation of purging and ice removal treatment, remove the cold insulation layer at the front part of the sleeve 110 and knock off large ice lumps by hitting with a hammer. Synchronously move the sleeve 110 forward. When the treated pipeline moves to the area of the preliminary winding of the cold insulation layer, wind the cold insulation layer 3 to be wound onto the pipeline surface through the gap between the winding device 140 and the pipeline. In this way, synchronously construct forward. When the liquefied natural gas pipeline 2 after the preliminary winding and sleeving moves out of the sleeve 110, immediately wrap the cold insulation material. Continuously operate synchronously in this way until the repair of the cold insulation layer in this area is completed.
[0051] In another embodiment, the sleeve 110 is composed of a pair of relatively buckled first half shells 111, and the pair of first half shells are connected by a buckle 112.
[0052] In another embodiment, the purging mechanism 120 is composed of a pair of relatively arranged purging frames, and the purging frames are respectively arranged in the first half shell 111. Wherein, the purging frame includes: multiple semicircular pipelines 121, which are equidistantly arranged in the first half shell 111 along the length direction of the first half shell 111, and a plurality of nozzles 122 are evenly arranged on the semicircular pipelines 121, and the ends of the semicircular pipelines 121 are sealed; a main pipe 123, which sequentially communicates with the middle parts of the multiple semicircular pipelines 121, and the starting end of the main pipe 123 is connected to the dry gas source through a hose.
[0053] In another embodiment, the multiple semicircular pipelines 121 are three.
[0054] In another embodiment, the winding mechanism 140 includes: a hopper-shaped body 141, the starting end of which is rotatably connected to the end of the sleeve 110, and the rear part of the hopper-shaped body 141 gradually converges inward; a reel frame 142, which is arranged on the outer periphery of the hopper-shaped body 141 for suspending the cold insulation material reel; an opening 143, which is arranged on the hopper-shaped body 141 for the cold insulation material to enter the hopper-shaped body 141.
[0055] In another embodiment, it further includes: a limiting ring groove 151, which is arranged on the inner periphery of the starting end of the hopper-shaped body 141; a plurality of limiting sliders 152, which are respectively arranged along the circumference on the outer periphery of the sleeve 110 and are adapted to the limiting ring groove 151 for realizing the rotatable connection between the hopper-shaped body 141 and the end of the sleeve 110.
[0056] In another embodiment, the hopper-shaped body 141 is composed of a pair of relatively buckled second half shells 141a, and the pair of second half shells 141a are connected by a buckle 141b.
[0057] In another embodiment, it further includes: a plurality of rotating handles 144, which are evenly arranged along the circumference on the outer periphery of the hopper-shaped body 141 for facilitating rotation.
[0058] In another embodiment, the plurality of sets of sliding support mechanisms 130 are 2 sets, and each set of sliding support mechanisms 130 is provided with 4 fixing bolts 131, 4 support frames 133 and 4 adjusting rods 135.
[0059] In another embodiment, the adjusting nut 136 is a butterfly nut.
[0060] In summary, for the cryogenic pipeline cold insulation layer online repair device 1 of the present invention, dry gas is purged inside the sleeve 110, a positive pressure environment is formed in the annular space between the sleeve 110 and the liquefied natural gas pipeline 2, preventing external humid air from entering and sublimating on the surface of the liquefied natural gas pipeline 2, improving the ice removal efficiency of the dry gas and saving the consumption of dry gas; a winding mechanism 140 is provided at the tail of the sleeve 110, which can realize the preliminary coating of the cold insulation layer 3 on the liquefied natural gas pipeline 2 after ice removal under the protection of a dry atmosphere, preventing the liquefied natural gas pipeline 2 from quickly frosting after ice removal when entering a humid air environment, leaving an operation time for subsequent coating of the cold insulation material and improving the repair quality of the cold insulation layer.
[0061] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.
Claims
1. An online repair device for the cold insulation layer of a cryogenic pipeline, characterized in that: include: The sleeve is a cylindrical structure and is used to cover the outer periphery of the liquefied natural gas pipeline; A purge mechanism is disposed in the sleeve and is used to connect to a dry gas source to purge the liquefied natural gas pipeline to rapidly sublime thin ice; A plurality of sets of sliding support mechanisms, which are arranged in the sleeve and located behind the purge mechanism, and are used to slidingly support the sleeve so that the sleeve can slide along the liquefied natural gas pipeline; A winding mechanism, which is rotatably disposed at the rear end of the sleeve and is used to wind the cold insulation material around the liquefied natural gas pipeline; Wherein, the sliding support mechanism comprises: A plurality of fixing bolts are evenly distributed along the circumference on the inner wall of the sleeve, and a connecting ring is provided at the end of each fixing bolt; A plurality of support frames, one end of which is hinged to the middle of the fixing bolt and the other end of which is provided with a sliding wheel; A plurality of adjusting rods, the ends of which are hinged to the middle of the support frame, the upper ends of the adjusting rods pass through the connecting ring, and the adjusting rods are provided with external threads; A plurality of adjusting nuts, which are respectively sleeved on the adjusting rods and matched with the external threads, and are used to adjust the inclination of the adjusting rods so as to match the outer periphery of the liquefied natural gas pipeline; The fixing bolts, the supporting frame and the adjusting rods correspond to each other one by one.
2. The online repair device for the cryogenic pipeline insulation layer according to claim 1 is characterized in that: The sleeve is composed of a pair of first half shells buckled relative to each other, and the pair of first half shells are connected by buckles.
3. The cryogenic pipeline insulation layer online repair device according to claim 2 is characterized in that: The purge mechanism is composed of a pair of purge racks arranged opposite to each other, and the purge racks are respectively arranged in the first half shell; Wherein, the purge rack comprises: A plurality of semicircular pipelines are arranged in the first half shell at equal intervals along the length direction of the first half shell, a plurality of nozzles are evenly distributed on the semicircular pipelines, and the ends of the semicircular pipelines are sealed; The main pipe is connected to the middle parts of the multiple semicircular pipes in sequence, and the starting end of the main pipe is connected to the dry gas source through a hose.
4. The online repair device for the cryogenic pipeline insulation layer according to claim 3 is characterized in that: The number of the multiple semicircular pipelines is 3.
5. The cryogenic pipeline insulation layer online repair device according to claim 2 is characterized in that: The winding mechanism comprises: A bucket-shaped body, the starting end of which is rotatably connected to the end of the sleeve, and the rear part of the bucket-shaped body gradually retracts inwards; A reel rack, which is arranged at the periphery of the bucket-shaped body and is used for suspending a reel of cold-insulating material; The opening is arranged in the bucket-shaped body and is used for allowing the cold-insulating material to enter the bucket-shaped body.
6. The cryogenic pipeline insulation layer online repair device according to claim 5 is characterized in that: Also includes: A limiting ring groove, which is arranged on the inner periphery of the starting end of the bucket-shaped body; A plurality of limit sliding blocks are respectively arranged along the circumference of the outer periphery of the sleeve and matched with the limit ring groove to realize the rotatable connection between the bucket-shaped body and the end of the sleeve.
7. The cryogenic pipeline insulation layer online repair device according to claim 5 is characterized by: The bucket-shaped body is composed of a pair of second half shells that are buckled relative to each other, and the pair of second half shells are connected by buckles.
8. The cryogenic pipeline insulation layer online repair device according to claim 5 is characterized in that: Also includes: A plurality of rotating handles are evenly distributed along the circumference on the outer periphery of the bucket-shaped body for facilitating rotation.
9. The cryogenic pipeline insulation layer online repair device according to claim 1 is characterized by: There are two groups of sliding support mechanisms, and each group of sliding support mechanisms is provided with three fixing bolts, three supporting frames and three adjusting rods.
10. The cryogenic pipeline insulation layer online repair device according to claim 1 is characterized by: The adjusting nut is a butterfly nut.