Supercritical carbon dioxide conveying steel pipe with high crack arrest toughness

Abstract

The utility model discloses a supercritical carbon dioxide conveying steel pipe with high crack arrest toughness, which comprises a welded pipe, a Fe-Cr-Ni metal coating and a modified PTFE (polytetrafluoroethylene) resin layer are sequentially sprayed on the inner surface of the welded pipe from the position close to the inner wall of the welded pipe to the outside, and a modified FBE (fiber bragg ether), a basalt reinforcing belt winding layer, a silicon dioxide aerogel heat preservation layer and an aluminum foil belt are sequentially sprayed on the outer surface of the welded pipe from inside to outside. According to the supercritical carbon dioxide conveying steel pipe with the high crack arrest toughness, the problems that in the prior art, when the temperature is low, phase change of carbon dioxide occurs, pressure bearing suddenly changes, and the service life of a pipeline and the conveying efficiency of the pipeline are seriously affected are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon dioxide transportation pipes and relates to a supercritical carbon dioxide transportation steel pipe with high crack arrest toughness. Background Art

[0002] Carbon dioxide transportation is the key link between carbon dioxide capture and storage and utilization in the CCUS / CCS industry chain. Supercritical carbon dioxide (pressure exceeding 7.38MPa and temperature greater than 31.1℃) has the high density of liquid and the low viscosity of gas. Supercritical carbon dioxide is most economical to transport over long distances. Due to the Joule-Thomson cooling effect of carbon dioxide, once the pipeline fails, leaks or is vented, the density of carbon dioxide will undergo a drastic mutation, forming a low temperature of -30℃ to -78℃ under a strong throttling effect. Supercritical carbon dioxide has a long decompression wave platform after decompression. Once the pipeline cracks, the crack will propagate along the axial direction of the pipeline at low temperature for a long distance, resulting in large-scale leakage of carbon dioxide and serious accidents. Therefore, the carbon dioxide pipeline itself is required to have excellent low-temperature crack arrest capabilities. However, there is inevitably water and other impurities (such as SO x 、NO x , O2, H2S, N2, etc.), the presence and interaction of impurities can cause corrosion and thinning of the pipeline, so the carbon dioxide pipeline itself needs to have a certain corrosion resistance.

[0003] As a supercritical carbon dioxide transmission pipe for stations exposed to the open air, in cold areas with low temperatures, the temperature inside the pipe is easy to drop below 31.1°C, which will cause the phase change of carbon dioxide and lead to sudden pressure changes, seriously affecting the life of the pipeline and pipeline efficiency, so the pipeline needs to be insulated. Therefore, it is necessary to develop a high crack arrest and corrosion-resistant supercritical carbon dioxide transmission steel pipe that can be used in stations. Utility Model Content

[0004] The utility model aims to provide a supercritical carbon dioxide transport steel pipe with high crack arrest toughness, which solves the problem in the prior art that carbon dioxide undergoes phase change at low temperatures, resulting in sudden pressure changes and seriously affecting the life of the pipeline and the transportation efficiency of the pipeline.

[0005] The technical solution adopted by the utility model is a supercritical carbon dioxide transport steel pipe with high crack arrest toughness, including a welded pipe, the inner surface of the welded pipe is sprayed with a Fe-Cr-Ni metal coating and a modified PTFE resin layer in sequence from close to the inner wall of the welded pipe to the outside, and the outer surface of the welded pipe is sprayed with a modified FBE layer, a basalt reinforcement belt winding layer, a silica aerogel insulation layer, and an aluminum foil belt in sequence from the inside to the outside.

[0006] The utility model is also characterized in that:

[0007] The thickness of the Fe-Cr-Ni metal coating is 60 μm to 100 μm.

[0008] The thickness of the modified PTFE resin layer is 15 μm to 40 μm.

[0009] The thickness of the modified FBE layer is 100 μm to 200 μm.

[0010] The thickness of the basalt reinforcement belt winding layer is 1cm to 4cm, the width of the basalt reinforcement belt is 5mm to 20mm, the two basalt reinforcement belts are cross-wound towards each other, and the winding angle of the two basalt reinforcement belts is 54° axially with the welded pipe.

[0011] The thickness of the silica aerogel insulation layer is 1 cm to 4 cm.

[0012] The thickness of the aluminum foil is 0.5mm to 1mm.

[0013] The beneficial effects of the utility model are:

[0014] (1) The utility model sprays Fe-Cr-Ni metal powder and modified PTFE resin double coating on the inner wall of the welded pipe to ensure that the inner wall of the welded pipe can achieve the purpose of preventing carbon dioxide corrosion; sprays modified FBE powder non-metallic coating on the outer wall of the welded pipe to prevent external corrosion of the welded pipe, wraps basalt reinforcement belt to ensure that when the welded pipe fails, the welded pipe quickly stops cracking at low temperature and improves the internal pressure resistance of the welded pipe; covers the welded pipe with silica aerogel for efficient thermal insulation, and wraps the aluminum foil belt to assist the thermal insulation of the entire pipe and resist external damage;

[0015] (2) The utility model supercritical carbon dioxide transport steel pipe is suitable for transporting supercritical carbon dioxide in open-air stations, has good anti-corrosion and heat preservation effects, and has strong low-temperature crack arresting ability, thereby achieving the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure section of the carbon dioxide delivery steel pipe of the utility model;

[0017] Figure 2 It is a schematic diagram of the winding angle of the basalt reinforcement belt of the carbon dioxide conveying steel pipe of the utility model.

[0018] In the figure, 1. welded pipe, 2. Fe-Cr-Ni metal coating, 3. modified PTFE resin layer, 4. modified FBE layer, 5. basalt reinforcement tape winding layer, 6. silica aerogel insulation layer, 7. aluminum foil tape. DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0020] The utility model has a supercritical carbon dioxide delivery steel pipe with high crack arrest toughness, such as Figure 1 As shown, it includes a welded pipe 1, wherein the welded pipe 1 adopts a straight seam electric resistance welded pipe or a submerged arc welded pipe, especially a spiral welded pipe. When the crack source expands along the axial direction of the steel pipe during failure explosion, when the crack is blocked across one spiral weld after another, the direction of the crack will be changed, so that the crack is easier to stop before the spiral weld. The inner surface of the welded pipe 1 is sprayed with a Fe-Cr-Ni metal coating 2 and a modified PTFE resin layer 3 in sequence from the inner wall of the welded pipe 1 to the outside, and the outer surface of the welded pipe 1 is sprayed with a modified FBE layer 4, a basalt reinforcement belt winding layer 5, a silica aerogel insulation layer 6, and an aluminum foil belt 7 in sequence from the inside to the outside.

[0021] Preferably, the thickness of the Fe-Cr-Ni metal coating 2 is 60 μm to 100 μm, and high-speed impact is caused on the inner surface of the welded pipe 1 substrate by thermal spraying to generate a Fe-Cr-Ni based powder coating with good density, especially the Fe-Cr-Ni fine-grained metal powder forms a NiO layer and a more stable Cr2O3 layer on the inner surface of the welded pipe 1, which can easily avoid pitting corrosion of the inner wall of the steel pipe caused by carbonic acid formed after CO2 dissolves in water.

[0022] Preferably, the thickness of the modified PTFE resin layer 3 is 15 μm to 40 μm. In order to fill the pores of the Fe-Cr-Ni metal coating 2, the modified PTFE resin coating is sprayed onto the surface of the Fe-Cr-Ni based powder coating by rotating the welded pipe 1 by centrifugal method in the welded pipe 1. The modified PTFE resin has excellent corrosion resistance and aging resistance, and is one of the best materials for transportation pipelines that meet high corrosion resistance and high creep resistance. Because it has a high-density molecular cross-linked structure, has a very low gas permeability, and has a small friction coefficient, it has excellent resistance to supercritical carbon dioxide fluid corrosion, and at the same time, it has a drag reduction and heat insulation effect on the flow of supercritical carbon dioxide medium, and the modified PTFE resin and the bottom Fe-Cr-Ni fine particle metal powder layer in the pipe are tightly combined to achieve a dual high-efficiency anti-corrosion effect.

[0023] Preferably, the thickness of the modified FBE layer 4 is 100 μm to 200 μm. The modified FBE coating is sprayed on the outside of the welded pipe 1, and the welded pipe 1 is heated to about 200°C by medium frequency induction, and an electrostatic spraying machine is used to spray a thickness of about 150 μm. Since the modified FBE is a new type of phenolic modified resin powder coating with an epoxy equivalent of 250 to 350, the microscopic voids of the FBE are filled, the cross-linking density of the coating is increased, and the mutual penetration and compatibility of the conventional FBE coating and the supercritical CO2 are prevented. The modified FBE coating does not react with the leaked supercritical CO2 and has excellent adhesion. The modified FBE layer improves the environmental permeability resistance of the ordinary FBE and improves the wet adhesion, which plays an anti-corrosion role on the steel pipe in the open air environment.

[0024] The thickness of the basalt reinforcement belt winding layer 5 is 1 cm to 4 cm. Figure 2 As shown, it is specifically achieved by cross-winding two basalt reinforcement belts in opposite directions, and the winding angle of the two basalt reinforcement belts is 54° with the axial direction of the welded pipe 1, which can better achieve the winding reinforcement effect. The basalt reinforcement belt is wound on the modified FBE powder layer, and the selected basalt reinforcement belt is 5mm-20mm wide. The basalt reinforcement belt is impregnated with a modified epoxy resin carbon fiber glue, and the two groups of reinforcement belts are cross-wound in opposite directions on the modified FBE layer 4 of the outer wall of the welded pipe 1. The winding angle is 54° with the axial direction of the steel pipe, and each is wound for 3 layers to form a basalt reinforcement belt winding layer 5. The resin impregnant is filled in the FBE layer 4 and the basalt reinforcement belt. It plays a sealing and reinforcing role. After calculation, the reinforcement layer wrapped around the welded pipe 1 can increase the conveying pressure of the welded pipe 1 by about 30%. Since the lowest operating temperature of the basalt reinforcement belt can reach -269°C and the tensile strength can reach 1500-2800MPa, especially the high strength, high rigidity and high toughness of the basalt reinforcement belt itself, it can ensure that when the welded pipe 1 fails in conveying supercritical carbon dioxide, it is equivalent to thickening the thickness of the steel pipe and plays the role of a crack stopper, preventing the welded pipe 1 from rapidly expanding over a long distance at low temperature and ensuring that the welded pipe 1 stops cracking immediately, so the safety of the operation of the supercritical carbon dioxide delivery pipe is greatly ensured.

[0025] Preferably, the thickness of the silica aerogel insulation layer 6 is 1 cm to 4 cm. On the basalt reinforcement belt layer 5, a silica aerogel insulation layer 6 is wrapped in an annular direction. The thermal conductivity of the silica aerogel is 0.13 W / (m·K). After design calculation, the thickness of the silica aerogel insulation layer 6 is 1.5 cm, which can achieve the designed operating temperature. Compared with other insulation layers, the thinning saves a lot of space in the open-air station.

[0026] Preferably, the thickness of the aluminum foil strip 7 is 0.5 mm to 1 mm. A layer of 3003 rust-proof aluminum foil strip outer protective layer is coated on the outside of the silica aerogel insulation layer 6. The thickness of the aluminum foil strip is 0.25 to 0.5 mm, and two layers are coated. The aluminum foil has a tiny closed honeycomb hole structure, which can play the role of pressure resistance, impact resistance, moisture resistance, etc. Through the above measures, the operating temperature of supercritical carbon dioxide is ensured to be above 31.1°C.

[0027] Therefore, the supercritical carbon dioxide transport steel pipe with high crack arrest toughness provided by the utility model has high crack arrest and efficient anti-corrosion and heat preservation effects when used in stations.

[0028] The utility model provides a supercritical carbon dioxide transport steel pipe (i.e., welded pipe 1) with high crack arrest toughness, which also has anti-corrosion and heat-insulating functions. By spraying Fe-Cr-Ni fine-grained metal powder on the inner surface of the steel pipe, a NiO layer and a more stable Cr2O3 layer are formed on the inner surface of the steel pipe, which is beneficial to resisting carbonic acid corrosion formed when CO2 dissolves in impure water. However, since the powder has voids, after the modified PTFE resin layer is sprayed on the outermost layer of the inner surface, the tiny voids of the Fe-Cr-Ni fine-grained metal powder are filled, and the interface adhesion with the metal powder layer is good, which improves the disadvantage of low peeling strength of the traditional PTFE resin with excellent corrosion resistance directly sprayed on the steel pipe, and the Fe-Cr-Ni fine-grained metal powder layer is combined to play a drag reduction, heat insulation and dual anti-corrosion role on the transported supercritical carbon dioxide.

[0029] By spraying a modified FBE layer on the outer surface of the steel pipe, it mainly plays an anti-corrosion role for the steel pipe in an open-air environment; then, on the modified FBE layer, a basalt reinforcement belt layer is wrapped on the modified FBE layer with the help of a resin impregnant, and the resin impregnant is filled between the modified FBE layer and the basalt reinforcement belt to play a sealing and bonding role, ensuring that when the steel pipe fails to leak when transporting supercritical carbon dioxide, the thickened basalt belt steel pipe can quickly stop cracking at low temperature, and basalt belts of different thicknesses can also increase the maximum internal pressure of the steel pipe transporting supercritical carbon dioxide by about 10%-40%, which effectively ensures the supercritical carbon dioxide delivery pipe. Safety of operation; As a new generation of intelligent energy storage and heat storage material, the silica aerogel insulation layer has a thickness of only 1 / 8 to 1 / 3 of the insulation material with the same thermal insulation effect. The silica aerogel is coated on the basalt reinforcement belt layer according to the designed thickness to ensure that the operating temperature of the supercritical carbon dioxide is above 31.1°C, which has a high-efficiency thermal insulation effect and saves station space; the aluminum foil has a tiny closed honeycomb pore structure, which has multiple functions such as pressure resistance, impact resistance, moisture resistance, etc. to prevent third-party damage. At the same time, it also plays a certain role in preventing heat loss in the pipe, thereby achieving the purpose of improving the safe transportation of supercritical carbon dioxide pipes.

[0030] Example 1

[0031] A supercritical carbon dioxide transport steel pipe with high crack arrest toughness comprises a welded pipe, the inner surface of which is sprayed with a Fe-Cr-Ni metal coating and a modified PTFE resin layer in sequence from the inner wall of the welded pipe to the outside, and the outer surface of the welded pipe is sprayed with a modified FBE layer, a basalt reinforcement belt winding layer, a silica aerogel insulation layer, and an aluminum foil belt in sequence from the inside to the outside.

[0032] The Fe-Cr-Ni metal coating has a thickness of 60 μm.

[0033] The thickness of the modified PTFE resin layer is 40 μm.

[0034] The thickness of the modified FBE layer is 100 μm.

[0035] The thickness of the basalt reinforcement belt winding layer is 4cm, the width of the basalt reinforcement belt is 5mm, and the two basalt reinforcement belts are cross-wound towards each other. The winding angle of the two basalt reinforcement belts is 54° axially with the welded pipe.

[0036] The thickness of the silica aerogel insulation layer is 2 cm.

[0037] The thickness of the aluminum foil is 0.5 mm.

[0038] Example 2

[0039] A supercritical carbon dioxide transport steel pipe with high crack arrest toughness comprises a welded pipe, the inner surface of which is sprayed with a Fe-Cr-Ni metal coating and a modified PTFE resin layer in sequence from the inner wall of the welded pipe to the outside, and the outer surface of the welded pipe is sprayed with a modified FBE layer, a basalt reinforcement belt winding layer, a silica aerogel insulation layer, and an aluminum foil belt in sequence from the inside to the outside.

[0040] The Fe-Cr-Ni metal coating has a thickness of 100 μm.

[0041] The thickness of the modified PTFE resin layer is 15 μm.

[0042] The thickness of the modified FBE layer is 200 μm.

[0043] The thickness of the basalt reinforcement belt winding layer is 2cm, the width of the basalt reinforcement belt is 10mm, and the two basalt reinforcement belts are cross-wound toward each other. The winding angle of the two basalt reinforcement belts is 54° axially with the welded pipe.

[0044] The thickness of the silica aerogel insulation layer is 1 cm.

[0045] The thickness of the aluminum foil is 1 mm.

[0046] Example 3

[0047] A supercritical carbon dioxide transport steel pipe with high crack arrest toughness comprises a welded pipe, the inner surface of which is sprayed with a Fe-Cr-Ni metal coating and a modified PTFE resin layer in sequence from the inner wall of the welded pipe to the outside, and the outer surface of the welded pipe is sprayed with a modified FBE layer, a basalt reinforcement belt winding layer, a silica aerogel insulation layer, and an aluminum foil belt in sequence from the inside to the outside.

[0048] The Fe-Cr-Ni metal coating has a thickness of 80 μm.

[0049] The thickness of the modified PTFE resin layer is 30 μm.

[0050] The thickness of the modified FBE layer is 150 μm.

[0051] The thickness of the basalt reinforcement tape winding layer is 1 cm, the width of the basalt reinforcement tape is 20 mm, and the two basalt reinforcement tapes are cross-wound toward each other. The winding angle of the two basalt reinforcement tapes is 54° to the axial direction of the welded pipe.

[0052] The thickness of the silica aerogel insulation layer is 4 cm.

[0053] The thickness of the aluminum foil is 0.8 mm.

Claims

1. Supercritical carbon dioxide transport steel pipe with high crack arrest toughness, characterized in that: The invention comprises a welded pipe (1), wherein the inner surface of the welded pipe (1) is sprayed with a Fe-Cr-Ni metal coating (2) and a modified PTFE resin layer (3) in sequence from the inner wall of the welded pipe (1) to the outside, and the outer surface of the welded pipe (1) is sprayed with a modified FBE layer (4), a basalt reinforcement tape winding layer (5), a silica aerogel insulation layer (6), and an aluminum foil tape (7) in sequence from the inside to the outside.

2. The supercritical carbon dioxide transport steel pipe with high crack arrest toughness according to claim 1, characterized in that: The Fe-Cr-Ni metal coating (2) has a thickness of 60 μm to 100 μm.

3. The supercritical carbon dioxide transport steel pipe with high crack arrest toughness according to claim 1, characterized in that: The modified PTFE resin layer (3) has a thickness of 15 μm to 40 μm.

4. The supercritical carbon dioxide transport steel pipe with high crack arrest toughness according to claim 1, characterized in that: The modified FBE layer (4) has a thickness of 100 μm to 200 μm.

5. The supercritical carbon dioxide transport steel pipe with high crack arrest toughness according to claim 1, characterized in that: The thickness of the basalt reinforcement tape winding layer (5) is 1 cm to 4 cm, the width of the basalt reinforcement tape is 5 mm to 20 mm, two pieces of the basalt reinforcement tape are wound crosswise in opposite directions, and the winding angle of the two pieces of the basalt reinforcement tape is 54° axially with the welded pipe (1).

6. The supercritical carbon dioxide transport steel pipe with high crack arrest toughness according to claim 1, characterized in that: The thickness of the silica aerogel thermal insulation layer (6) is 1 cm to 4 cm.

7. The supercritical carbon dioxide transport steel pipe with high crack arrest toughness according to claim 1, characterized in that: The thickness of the aluminum foil strip (7) is 0.5 mm to 1 mm.

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