CN215335204U - A novel cold insulation structure for LNG pipeline is under construction on line - Google Patents
A novel cold insulation structure for LNG pipeline is under construction on line Download PDFInfo
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Abstract
The utility model discloses a novel cold insulation structure for LNG pipeline online construction, which comprises a low-temperature sponge cold insulation layer, a first foam glass cold insulation layer, a PIR cold insulation layer, a second foam glass cold insulation layer and an outermost protection layer, wherein the low-temperature sponge cold insulation layer, the first foam glass cold insulation layer, the PIR cold insulation layer, the second foam glass cold insulation layer and the outermost protection layer adopt an arrangement sequence cold insulation distribution structure which is sequentially arranged on the outer peripheral wall of a pipeline from inside to outside. The LNG pipeline can be maintained online, the stability and reliability of the overall quality of the LNG pipeline after online maintenance are effectively improved, and the online maintenance qualification rate and quality assurance are improved.
Description
Technical Field
The utility model relates to an LNG pipeline, in particular to a novel cold insulation structure for online construction of the LNG pipeline, which is used for online maintenance of the LNG pipeline.
Background
The system media of unloading, storage, high-pressure gasification, tank car loading, BOG recondensation and the like of the LNG receiving station are LNG or low-temperature BOG, and only the downstream of the gasifier is normal-temperature natural gas, namely most systems of the receiving station operate at low temperature (below minus 120 ℃). And a cold-hot alternating state exists in partial process emptying, condensate discharging pipelines and equipment. The cold insulation system plays an important role in the running energy consumption of the LNG receiving station, the safety and the stable running of equipment facilities, so that the cold insulation system is a system with important functions of the receiving station, and is not only an auxiliary system.
The cold insulation forms of the existing pipelines and valves are different according to the main cold insulation materials of the pipelines, and the cold insulation structures of the pipelines can be divided into hard cold insulation structures and flexible cold insulation structures. Wherein the hard cold insulation structure can be divided into PIR cold insulation structure, PIR + FG (foam glass) composite structure and PIR + SA (nano heat insulation material). The flexible cold insulation structure is formed by diene elastomer foaming flexible materials and nitrile rubber foaming flexible materials. According to statistics, in the LNG pipeline cold insulation structure form of domestic main LNG receiving station and natural gas liquefaction station, PIR + foam glass cold insulation structure accounts for about 50%, PIR cold insulation structure accounts for about 40%, flexible cold insulation structure accounts for about 7%, and PIR + SA cold insulation structure accounts for about 3%. The cold insulation structure mainly adopts the following cold insulation structure.
In the cold insulation structure of stereoplasm, PIR cold insulation structure main material adopts polyisocyanurate (PIR for short), and supplementary material mainly has: low temperature sealants, fiberglass tape, fiberglass blankets, butyl rubber, PAP aluminum foil, mastic, glass cloth, metal outer protective layers, metal sealants, stainless steel tape, and the like. The PIR + FG (foam glass) composite structure adopts polyisocyanurate (PIR for short) and Foam Glass (FG) as main materials, and the auxiliary materials mainly comprise: low-temperature sealant, an anti-wear agent, a glass fiber tape, a glass fiber blanket, butyl rubber, PAP aluminum foil, mastic, glass cloth, a metal outer protective layer, metal sealant, a stainless steel tape and the like. The main material PIR + SA (nano heat insulation material) adopts polyisocyanurate (PIR for short) and silica aerogel, and the auxiliary material mainly comprises: low-temperature sealant, a glass fiber tape, a glass fiber blanket, butyl rubber, a PAP aluminum foil, a metal outer protective layer, metal sealing glue, a stainless steel tape and the like. Adopt alkadiene elastomer foaming flexible material + butadiene nitrile rubber foaming flexible material at flexible cold insulation structure owner material, supplementary material mainly has: the aluminum foil wear-resistant layer, the aluminum foil adhesive tape, the sealant, the metal outer protective layer, the metal sealing adhesive, the stainless steel band and the like. The hard cold insulation structure and the flexible cold insulation structure have the advantages and disadvantages of the pipeline cold insulation structure, and the flexible cold insulation structure has the advantages of moisture resistance, good plasticity, few joints and short construction period; the disadvantages are that: precooling shrinkage causes cold insulation and outer protection hollowing and reduces cold insulation effect; the hard cold insulation structure has the advantages that: the appearance quality is good, and the cold insulation effect is reliable; the defects of more joints, complex construction procedures and high material prefabrication requirement; the problems of poor cold insulation effect, dewing on the surface of a pipeline, falling of an outer protection part of a flexible cold insulation structure, icing at a joint of a pipe bracket and the like of an LNG receiving station generally exist, and construction and maintenance are needed; the domestic LNG receiving station lacks large-area on-line maintenance experience, and the production and construction maintenance are carried out simultaneously, so that the safety risk is high, and the maintenance scheme and the cold insulation structure form need further exploration.
In particular, the following technical difficult conditions exist: 1. during on-line maintenance, the surface temperature of the LNG pipeline is about-160 ℃, and partial pipe fittings such as elbows are deformed by cold contraction and have deviation from standard sizes. If the pipe shell is prefabricated according to the standard elbow, the pipe shell cannot be matched with the low-temperature elbow during online installation, namely the pipe shell cannot be installed. 2. The welding seam of the pipeline is generally higher than that of the parent metal, and if a hard cold insulation pipe shell is adopted, a certain gap exists between the outer surface of the pipeline and the pipe shell; if the cleaning of the attachments on the surface of the pipeline is not thorough, a certain gap is also generated. During on-line construction, water vapor can be condensed and frozen in the gap, the cold insulation effect is directly influenced, and if the content of free chloride ions in the water vapor is higher, the risk of corrosion of the stainless steel pipeline can also exist. 3. When the hard cold insulation material is adopted for online maintenance, because the temperatures of the cold insulation materials on different layers are different, axial relative displacement can occur between the cold insulation material layers and the cold insulation material layers, and the cold insulation material layers are mutually extruded, so that the cold insulation pipe shell is possibly crushed, and the cold insulation effect cannot be met. 4. After the pipeline is removed and kept cold, the surface of the pipeline can be frosted.
And the receiving station of LNG is after operating for a plurality of years, because pipeline design or construction problem in earlier stage, the cold insulation efficiency of pipeline descends, leads to the pipeline condensation to freeze, appears the cavitation phenomenon even, unable normal operating, produces great risk factor, for quick solution this problem, adopts the online maintenance to be the most feasible mode. But the requirement of the online inspection and maintenance on cold insulation structure and construction is very high, because the pipeline is in a liquid-carrying low-temperature state during the online inspection and maintenance, the surface temperature of the pipeline is below minus 160 ℃, and the pipe is also in a cold-shrinkage state, the pipe support part is not movable; if demolish former cold insulation structure between the conduit saddle after, the situation of freezing will appear immediately on the pipeline surface, lead to original pipeline to have irregularly, the uneven circumstances such as height appear, the laminating degree between the thermal-insulated material that appears the stereoplasm and the pipeline can be very poor, if the size after cold insulation material size adopts the shrinkage, get back to the normal atmospheric temperature at pipeline temperature, the cold insulation structure will be destroyed in the inflation of pipeline, if according to former design size, have the space during the installation, the gas tightness is difficult to guarantee again.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel cold insulation structure for LNG pipeline online construction, which can online overhaul and maintain the LNG pipeline, effectively improve the overall quality stability, reliability and effectiveness of the LNG pipeline after online overhaul and maintenance, and improve the online overhaul and maintenance qualification rate and quality assurance of the LNG pipeline.
The utility model adopts the following specific technical scheme for solving the technical problems: the utility model provides a novel cold insulation structure for online construction of LNG pipeline which characterized in that: including low temperature sponge cold insulation layer, first foam glass cold insulation layer, PIR cold insulation layer, second foam glass cold insulation layer and outmost inoxidizing coating, low temperature sponge cold insulation layer, first foam glass cold insulation layer, PIR cold insulation layer, second foam glass cold insulation layer and outmost inoxidizing coating adopt by interior and outer encircle the cladding in proper order and locate the range order cold insulation distribution structure on the pipeline periphery wall. The low temperature sponge cold insulation layer has compressibility for the elastic adjustment layer, can overcome the problem of pipe fitting shrinkage deflection, first foam glass cold insulation layer and second foam glass cold insulation layer can effectively make it can be ignored at LNG cryrogenic pipeline surface axial displacement, improve the reliable and stable validity of cold insulation structure, can carry out online maintenance to the LNG pipeline, effectively improve the reliable and stable validity of the whole quality of LNG pipeline after online maintenance, improve online maintenance qualification rate and quality assurance.
Preferably, the low-temperature sponge layer is of a melamine layer structure. The effectiveness of the cold insulation structure for overcoming the cold shrinkage deformation of the pipe fitting is improved.
Preferably, a wear-resistant protective layer is arranged between the first foam glass cold insulation layer and the PIR cold insulation layer, a secondary moisture-proof layer is arranged between the first foam glass cold insulation layer and the second foam glass cold insulation layer, a main moisture-proof layer is arranged between the second foam glass cold insulation layer and the outermost protective layer, and the outermost protective layer is a metal outer protective layer; the first foam glass cold insulation layer and the second foam glass cold insulation layer are respectively provided with low-temperature sealant, and the metal outer protective layer is provided with metal sealant. The wear-resistant, moisture-proof, sealed and protected reliability and effectiveness of the whole low-temperature cold insulation structure are improved, and the use safety, reliability and effectiveness of the whole low-temperature cold insulation structure are improved.
Preferably, the low-temperature sponge cold insulation layer, the first foam glass cold insulation layer, the PIR cold insulation layer and the second foam glass cold insulation layer are all provided with reinforcing ties. The cold insulation fixing and positioning reliability and effectiveness of each cold insulation layer are improved.
Preferably, the tolerance temperature of the low-temperature sponge cold insulation layer is-200 ℃ to +150 ℃. The cold insulation tolerance of the low-temperature sponge cold insulation layer during online maintenance is improved, and the safe reliability of cold insulation use is improved.
Preferably, the rebound rate of the low-temperature sponge cold insulation layer is not less than 60%, the tensile strength of the low-temperature sponge cold insulation layer is not less than 100KPa, and the tear strength of the low-temperature sponge cold insulation layer is not less than 25N/m. The safety operation degree of the low-temperature sponge cold insulation layer during online maintenance and repair operation is improved, the stability, reliability and effectiveness of the overall quality of the LNG pipeline after online maintenance are improved, and the online maintenance and repair qualification rate and quality assurance are improved.
Preferably, the first foam glass cold insulation layer and the second foam glass cold insulation layer are made of pure glass materials. The low-temperature stability of the whole low-temperature cold insulation structure during and after on-line maintenance is reduced or avoided, and the deformation phenomenon is prevented.
Preferably, the thickness of the foam glass layer of the first foam glass cold insulation layer and the second foam glass cold insulation layer is 30-80 mm. The stability and reliability effectiveness of the whole low-temperature cold insulation structure during and after on-line maintenance are improved, the cold insulation moisture-proof isolation effect is improved, and the bad quality phenomena such as deformation and displacement are avoided.
Preferably, the compressive resistance of the first foam glass cold insulation layer and the second foam glass cold insulation layer is not less than 0.5MPa, the tearing resistance of the first foam glass cold insulation layer and the second foam glass cold insulation layer is not less than 0.35MPa, and the linear expansion coefficient of the first foam glass cold insulation layer and the second foam glass cold insulation layer is 6x10-6V. C. The stability and reliability effectiveness of the whole low-temperature cold insulation structure during and after on-line maintenance are improved, the cold insulation moisture-proof isolation effect is improved, and the bad quality phenomena such as deformation and displacement are avoided.
Preferably, the cold insulation layers of the low-temperature sponge cold insulation layer, the first foam glass cold insulation layer, the PIR cold insulation layer and the second foam glass cold insulation layer are in staggered joint structures. The phenomenon of through seam is better avoided.
The utility model has the beneficial effects that: the LNG pipeline can be maintained online, the stability and reliability of the overall quality of the LNG pipeline after online maintenance are effectively improved, and the online maintenance qualification rate and quality assurance are improved. The cold insulation structure of the utility model is characterized in that: the low-temperature sponge cold insulation layer has good elasticity and compressibility, and can well overcome the problem of cold shrinkage deformation of the pipe fitting; after the pipe wall is tightly attached, the problem of the gap between the cold insulation pipe shell and the pipe wall can be solved; if the innermost layer freezes, the foam glass can be expanded and extruded, and the buffer effect can be achieved. As the linear expansion coefficients of the foam glass of the first foam glass cold insulation layer and the second foam glass cold insulation layer are extremely small and are about 5x 10-6/DEG C at the temperature of-160 ℃, the axial displacement of the foam glass at the innermost layer on the surface of the LNG cryogenic pipeline can be ignored by calculating according to 6 meters of each section of pipeline, and in addition, the compressive strength of the foam glass is higher than 500KPa, even if certain axial displacement exists, the extrusion force between cold insulation materials can be completely borne. The linear expansion coefficient of the PIR is about 6x 10-5/DEG C at-160 ℃, but the temperature of the PIR is ensured to be greatly reduced to 1/10 at the axial displacement because the PIR is not directly contacted with an LNG pipeline, so that the PIR is extremely unlikely to be crushed, and the PIR can be prevented from being frozen and frosted due to the fact that the PIR is pulled apart at a joint caused by shrinkage. The low temperature pipeline is under construction on line, and the pipeline surface has the frost, and the inlayer is the foam glass on first foam glass cold insulation layer and second foam glass cold insulation layer and does not absorb water, can play isolated moisture's effect. The thickness of each layer of PIR is not more than 80mm, so that the condition that the temperature difference of a radial temperature field is too large to cause material shrinkage fracture due to too thick cold insulation material can be avoided. The foam glass of the first foam glass cold insulation layer and the second foam glass cold insulation layer is non-combustible, the PIR is combustible in continuous flame, and the safety is high. The foam glass of the first foam glass cold insulation layer and the second foam glass cold insulation layer has the excellent characteristics of excellent low-temperature stability, high compressive strength, water resistance, fire resistance, air impermeability, aging resistance, fading resistance, almost no chloride ion content, environmental friendliness, no toxicity and no secondary pollution after being dismantled, so that the low-temperature stability of the whole low-temperature cold insulation structure is improved, the fire resistance and the water resistance of the whole low-temperature cold insulation structure are improved, and the service life, the stability and the reliability of the whole low-temperature cold insulation structure are improved. The low-temperature sponge has the beneficial effects that the low-temperature sponge is adopted, the low-temperature sponge is in an online detection and maintenance state, humidity and water vapor on the surface of a pipeline cannot be discharged, the heat insulation layer can wrap some water, the water exists in an ice form when the pipeline is normally driven, when the pipeline is stopped or the pipeline is normally driven to run, the ice in a non-horizontal section can be changed into water and flows to a low place along the pipeline to be gathered, when the pipeline is driven again, the water can be frozen again to generate expansion, the heat insulation and heat preservation structure is damaged, and a major risk point is formed. By using the low-temperature sponge, the utility model effectively utilizes the adsorption effect of the low-temperature sponge to fix the melted water, thereby avoiding local convergence and avoiding the formation of major risk points.
Description of the drawings:
the utility model is described in further detail below with reference to the figures and the detailed description.
Fig. 1 is a schematic structural diagram of the novel cold insulation structure for the on-line construction of the LNG pipeline according to the present invention.
Fig. 2 is a table of design parameters of the thickness of each cold insulation layer of the novel cold insulation structure for the on-line construction of the LNG pipeline according to the present invention.
Fig. 3 is a table for collecting the temperature test data of the outer surface of the test point of the LNG pipeline cold insulation online overhaul and maintenance construction of the high-pressure pump, which is applied to the novel cold insulation structure for the LNG pipeline online construction of the present invention.
Fig. 4 is a test data collection table of the cold leakage amount of the LNG pipeline cold insulation on-line maintenance construction test point using the high-pressure pump, which is applied to the novel cold insulation structure for LNG pipeline on-line construction of the present invention.
Detailed Description
In the embodiment shown in fig. 1 and 2, a novel cold insulation structure for LNG pipeline online construction includes a low-temperature sponge cold insulation layer 20, a first foamed glass cold insulation layer 30, a PIR cold insulation layer 50, a second foamed glass cold insulation layer 70 and an outermost protection layer 90, wherein the low-temperature sponge cold insulation layer 20, the first foamed glass cold insulation layer 30, the PIR cold insulation layer 50, the second foamed glass cold insulation layer 70 and the outermost protection layer 90 are arranged in an arrangement order cold insulation distribution structure which is sequentially wrapped around and arranged on the outer peripheral wall of the pipeline 10 from inside to outside. The low-temperature sponge layer adopts a melamine material layer structure. A wear-resistant protective layer 40 is arranged between the first foam glass cold insulation layer and the PIR cold insulation layer, a secondary moisture-proof layer 60 is arranged between the first foam glass cold insulation layer and the second foam glass cold insulation layer, a main moisture-proof layer 80 is arranged between the second foam glass cold insulation layer and the outermost protective layer, and the outermost protective layer 90 is a metal outer protective layer; first foam glass cold insulation layer and second foam glass cold insulation layerThe layers are respectively provided with low-temperature sealant 11, and the metal outer protective layer is provided with metal sealant 12. All be equipped with on low temperature sponge cold insulation layer, first foam glass cold insulation layer, PIR cold insulation layer, the second foam glass cold insulation layer and consolidate ribbon 10. The reinforcing band 10 is in a stainless steel band structure. The tolerance temperature of the low-temperature sponge cold insulation layer is-200 ℃ to +150 ℃. The rebound rate of the low-temperature sponge cold insulation layer is more than or equal to 60 percent, the tensile strength of the low-temperature sponge cold insulation layer is more than or equal to 100KPa, and the tear strength of the low-temperature sponge cold insulation layer is more than or equal to 25N/m. The tolerance temperature ranges of the first foam glass cold insulation layer and the second foam glass cold insulation layer are-268 ℃ to +480 ℃, the cold insulation tolerance of the whole low-temperature cold insulation structure during and after online maintenance and repair is improved, and the safe reliability of cold insulation use is improved. The first foam glass cold insulation layer and the second foam glass cold insulation layer are of pure glass material structures. The thickness of the foam glass layer of the first foam glass cold insulation layer and the second foam glass cold insulation layer is 30-80 mm. The compressive resistance of the first foam glass cold insulation layer and the second foam glass cold insulation layer is more than or equal to 0.5MPa, the tearing resistance of the first foam glass cold insulation layer and the second foam glass cold insulation layer is more than or equal to 0.35MPaKP2, and the linear expansion coefficient of the first foam glass cold insulation layer and the second foam glass cold insulation layer is 6x10-6V. C. The PIR cold insulation layer 50 is made of polyisocyanurate materials. And staggered joint structures are adopted among the cold insulation layers of the low-temperature sponge cold insulation layer, the first foam glass cold insulation layer, the PIR cold insulation layer and the second foam glass cold insulation layer. The phenomenon of through seam is better avoided.
From the data information collected at the detection points of fig. 3 and 4, which are taken as examples of the cold insulation on-line construction of the LNG pipeline of the high-pressure pump, it can be seen that the analysis is performed from the perspective of cold leakage amount, and the design of the cold leakage amount is 25W/m2The qualified rate of the measuring points is 100 percent as a qualified line; and analyzing by using an anti-condensation angle, wherein the surface temperature of all measuring points is higher than the condensation point temperature of 26 ℃ under the design working condition in a conversion way, and the pass rate of the measuring points is 100%.
The design and acceptance standard of the novel cold insulation system is as follows: in order to better prevent the cold insulation layer with the dewing on the outer surface, the thickness can be calculated by adopting a more accurate surface temperature method; a certain amount of cold insulation layer with cold loss is technically allowed, and the thickness is calculated by using a thermal equilibrium method; the temperature of the outer surface is 0.3 ℃ higher than the dew point temperature, and the maximum allowable cold loss is 25W/m 2. Indexes such as heat conductivity coefficient, density, safe use temperature, combustion resistance, moisture resistance, strength, thermal stability, PH and the like of the cold insulation material need to meet standard requirements; as the pipelines and the equipment are made of stainless steel, the content of chloride ions also meets the standard requirement. GB/T17393-2008
In the positional relationship description of the present invention, the appearance of terms such as "inner", "outer", "upper", "lower", "left", "right", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings is merely for convenience of describing the embodiments and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operation, and thus, is not to be construed as limiting the present invention.
The foregoing summary and structure are provided to explain the principles, general features, and advantages of the product and to enable others skilled in the art to understand the utility model. The foregoing examples and description have been presented to illustrate the principles of the utility model and are intended to provide various changes and modifications within the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a novel cold insulation structure for online construction of LNG pipeline which characterized in that: including low temperature sponge cold insulation layer, first foam glass cold insulation layer, PIR cold insulation layer, second foam glass cold insulation layer and outmost inoxidizing coating, low temperature sponge cold insulation layer, first foam glass cold insulation layer, PIR cold insulation layer, second foam glass cold insulation layer and outmost inoxidizing coating adopt by interior and outer encircle the cladding in proper order and locate the range order cold insulation distribution structure on the pipeline periphery wall.
2. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1, characterized in that: the low-temperature sponge layer is of a melamine material layer structure.
3. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1, characterized in that: a wear-resistant protective layer is arranged between the first foam glass cold insulation layer and the PIR cold insulation layer, a secondary moisture-proof layer is arranged between the first foam glass cold insulation layer and the second foam glass cold insulation layer, a main moisture-proof layer is arranged between the second foam glass cold insulation layer and the outermost protective layer, and the outermost protective layer is a metal outer protective layer; the first foam glass cold insulation layer and the second foam glass cold insulation layer are respectively provided with low-temperature sealant, and the metal outer protective layer is provided with metal sealant.
4. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1, characterized in that: all be equipped with the reinforcement ribbon on low temperature sponge cold insulation layer, first foam glass cold insulation layer, PIR cold insulation layer, the second foam glass cold insulation layer.
5. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1, characterized in that: the tolerance temperature of the low-temperature sponge cold insulation layer is-200 ℃ to +150 ℃.
6. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1 or 2 or 4 or 5, characterized in that: the resilience rate of the low-temperature sponge cold insulation layer is more than or equal to 60%, the tensile strength of the low-temperature sponge cold insulation layer is more than or equal to 100KPa, and the tear strength of the low-temperature sponge cold insulation layer is more than or equal to 25N/m.
7. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1, characterized in that: the first foam glass cold insulation layer and the second foam glass cold insulation layer are of pure glass material structures.
8. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1, characterized in that: the thickness of the foam glass layer of the first foam glass cold insulation layer and the second foam glass cold insulation layer is 30-80 mm.
9. The novel cold insulation structure for LNG pipeline on-line construction according to claim 7, characterized in that: the compressive resistance of the first foam glass cold insulation layer and the second foam glass cold insulation layer is more than or equal to 0.5MPa, the tearing resistance of the first foam glass cold insulation layer and the second foam glass cold insulation layer is more than or equal to 0.35MPa, and the linear expansion coefficient of the first foam glass cold insulation layer and the second foam glass cold insulation layer is 6 to 10-6/℃。
10. The novel cold insulation structure for LNG pipeline on-line construction according to claim 1, characterized in that: and staggered joint structures are adopted among the cold insulation layers of the low-temperature sponge cold insulation layer, the first foam glass cold insulation layer, the PIR cold insulation layer and the second foam glass cold insulation layer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114382989A (en) * | 2022-01-20 | 2022-04-22 | 河南中坤建设工程有限公司 | Online cold insulation maintenance method for low-temperature pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114382989A (en) * | 2022-01-20 | 2022-04-22 | 河南中坤建设工程有限公司 | Online cold insulation maintenance method for low-temperature pipeline |
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