CN203907575U - U-shaped tube with graphene layer - Google Patents
U-shaped tube with graphene layer Download PDFInfo
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- CN203907575U CN203907575U CN201420294595.1U CN201420294595U CN203907575U CN 203907575 U CN203907575 U CN 203907575U CN 201420294595 U CN201420294595 U CN 201420294595U CN 203907575 U CN203907575 U CN 203907575U
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Abstract
The utility model discloses a U-shaped tube with a graphene layer. The U-shaped tube is used in a steam generator of a loop system of a nuclear power plant. The wall of the U-shaped tube is provided with the graphene layer. The U-shaped tube with the graphene layer has the advantages of being small in thermal resistance, high in power generating efficiency, high in mechanical strength, economical, practical and the like.
Description
Technical field
The utility model relates to plant equipment field and nuclear energy field, specially refers to U-shaped tubular construction in steam generator.
Background technology
Nuclear power station is the power plant that utilizes the power generation electric energy that nuclear fission or nuclear fusion reaction discharge, and its inside is comprised of a circuit system and secondary coolant circuit system conventionally, and wherein reactor is the core of nuclear power station.Reactor inner generation nuclear fusion or nuclear fission reaction, the heat energy discharging is taken out of by the cooling agent of a circuit system, by steam generator, make secondary circuit cooling agent change steam into, thereby drive Turbo-generator Set to generate electricity, therefore, a whole circuit system is called as " core steam-supplying system ", and it is equivalent to the steam generator system of thermal power plant, and the steam turbine generator system of secondary coolant circuit system and thermal power plant is basic identical.
At present, what most of reactors adopted is light water reactor,, with light-water, the neutron in nuclear reactor is carried out to slowing down and cooling that is, and light water reactor is divided into again presurized water reactor and boiling-water reactor.Now take the effect of presurized water reactor as example explanation steam generator.
One circuit system and the secondary coolant circuit system of pressurized-water reactor nuclear power plant separate completely, and it is an airtight circulatory system.The principle process of this nuclear power station is: main pump is sent cryogenic high pressure one circuit cools agent into reactor, make it to remain on 120～160 times of atmospheric pressure, under condition of high voltage, even if a circuit cools agent temperature still can not vaporized higher than 300 ℃, a liquid circuit cools agent is taken reactor out of the heat discharging in reactor, and enters steam generator, pass through heat-transfer pipe, heat is passed to the secondary circuit cooling agent outside pipe, conventionally make water, make water boiling produce steam; The one circuit cools agent steam generator of flowing through carries out after heat exchange, then sends reactor back to by main pump, and reciprocation cycle, constantly takes the heat producing in reactor out of like this, and conversion produces steam; And from steam generator high temperature and high pressure steam out, promoting Turbo-generator Set generating, the waste vapour of doing merit condenses into water in condenser, then sends into heater by feed pump, sends steam generator after reheating back to, the secondary circuit circulatory system that Here it is.
As can be seen here, steam generator be connect one, the visual plant of secondary circuit, be called as one, the hinge of secondary circuit.Can steam generator move safely, reliably has very important impact to the economy of whole nuclear power unit and security reliability.Heat-transfer pipe in so-called steam generator is the U-shaped tube bank of proper alignment, U-shaped tube bank is most important heat-exchanging component in steam generator, the high temperature one circuit cools agent of being flowed out by nuclear reactor is carried out flowing back to reactor core after heat exchange via U-shaped tube bank and the water outside pipe again, constantly move in circles, carry out heat transmission, the quality of U-shaped tube bank exchange capability of heat has determined the size of steam generator exchange capability of heat.Therefore, manufacture U-shaped tube material and need to possess heat resistance, heat endurance and good welding performance simultaneously, thermal conductivity is high, thermal coefficient of expansion is little, and anti-homogeneous corrosion, anti-local corrosion ability are strong, have the advantages such as enough plasticity and toughness, and ordinary metallic material is difficult to reach this requirement.
At present, U-shaped pipe in used in nuclear power station steam generator is mainly selected Inco nickel 690 materials, and its thermal conductivity factor is about 12.1W/mK, higher than common iron, it has the ability of good anti intercrystalline corrosion and anti-intergranular stress corrosion cracking, the far super common iron of mechanical performance simultaneously.
Yet the thermal conductivity factor of the U-shaped pipe that in nuclear power station steam generator, Inco nickel 690 materials are manufactured is still not satisfactory, there is room for promotion, and other has the corrosion resistance of the metal material of more excellent thermal conductivity factor, the performances such as intensity all cannot meet U-shaped pipe performance requirement in nuclear power station steam generator simultaneously, simultaneously the rich transformation of U-shaped tube wall structure leeway.
In addition, at present the U-shaped pipe in steam generator is used through long-term, and tube wall heat transfer property significantly declines, and badly broken affects the heat transfer efficiency of nuclear power unit, causes serious potential safety hazard simultaneously.
Graphene is a kind of new material of the individual layer laminated structure consisting of carbon atom.The cellular lattice structure of its two-dimension periodic being formed by carbon hexatomic ring, its basic structural unit is benzene six-membered ring structure the most stable in organic material, it can be rolled into the CNT of one dimension.Graphene is that world is the thinnest is at present the hardest nano material also, and its structure is highly stable, up to now, do not find yet to have in Graphene the situation of carbon atom disappearance, Graphene has the extremely strong capacity of heat transmission simultaneously, and thermal conductivity factor is up to 5300W/mK, higher than CNT and diamond.
For single-layer graphene, multi-layer graphene intensity increases, but its capacity of heat transmission declines to some extent, and however, the capacity of heat transmission of multi-layer graphene is still better than Inco nickel 690 materials, according to cylinder barrel thermal resistance calculation formula
the Graphene capacity of heat transmission declines with the increase of thickness.Graphene thermal conductivity factor is 5300W/mK, and Inco nickel 690 thermal conductivity factors are 12.1W/mK, so the Graphene capacity of heat transmission is better than Inco nickel 690 materials of stack pile.
Under the percussion of high-pressure fluid, can there is relative sliding in the interlayer of multi-layer graphene, and this can cause malformation to cause heat transfer deterioration
At present, not yet have the U-shaped tube wall structure as core component is carried out to improved report, if by U-shaped tube wall structure is carried out appropriate design and is selected suitable material, heat conductivility may be developed better, the U-shaped pipe that mechanical performance is stronger, to obtain better economy and security reliability.
Utility model content
In order to address the above problem, the utility model adopts following technical scheme: keeping, U-shaped pipe appearance and size is constant, keep in U-shaped tube wall, graphene layer being set in situation that U-shaped pipe external diameter is constant, utilize the heat conductivility of Graphene superelevation to improve the heat transfer efficiency of U-shaped pipe, utilize its stable lattice structure and chemical inertness to increase mechanical strength and the corrosion resistance of pressure U shape tube simultaneously, thereby complete the utility model.
The utility model object is to provide following aspect:
(1) there is a U-shaped pipe for graphene layer, it is characterized in that: this has the U-shaped pipe of graphene layer for the steam generator of nuclear power station one circuit system, and it comprises the body taking the shape of the letter U, two side pipes of body are cylindrical tube shape, its tube wall comprises graphene layer, wherein
The external diameter of U-shaped pipe is 17～22mm, and U-shaped tube wall thickness is 0.08～2mm;
The thickness of graphene layer is 0.08～0.2mm;
The side pipe openend of U-shaped pipe body is set up annular resistance piece.
(2) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that, described Graphene is multi-layer graphene.
(3) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that, described annular resistance piece is arranged at the side pipe openend 1～5cm place apart from body.
(4) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that, described U-shaped tube wall consists of graphene layer, and wherein, U-shaped tube wall thickness is 0.08～0.12mm.
(5) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that, described U-shaped tube wall comprises inner wall layer 1 and the outer wall layer 2 of lamination, wherein,
Inner wall layer 1 consists of Inco nickel 690 materials, and outer wall layer 2 consists of Graphene, and wherein, the thickness of inner wall layer 1 is 0.9～1.8mm, and outer wall layer 2 thickness are 0.1～0.2mm;
U-shaped tube wall is thick is 1～2mm;
Outer wall layer 2 is formed in inner wall layer 1 by CVD method.
(6) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that, described U-shaped tube wall comprises inner wall layer 1 and the outer wall layer 2 of lamination, wherein,
Inner wall layer 1 consists of Graphene, and outer wall layer 2 consists of Inco nickel 690 materials, and wherein, the thickness of inner wall layer 1 is 0.1～0.2mm, and outer wall layer 2 thickness are 0.9～1.8mm;
U-shaped tube wall is thick is that 1～2mm inner wall layer 1 is formed on outer wall layer 2.
(7) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that, described U-shaped tube wall comprises inner wall layer 1, middle parietal layer 3 and the outer wall layer 2 of lamination successively, wherein,
Inner wall layer 1 consists of Graphene respectively with outer wall layer 2, and middle parietal layer 3 consists of Inco nickel 690 materials, and wherein, the thickness of inner wall layer 1 and outer wall layer 2 is respectively 0.1～0.2mm, and middle parietal layer 3 thickness are 0.8～1.6mm;
U-shaped tube wall is thick is 1～2mm; Inner wall layer 1 and outer wall layer 2 are formed at respectively on middle parietal layer 3.
(8) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that, described U-shaped tube wall comprises inner wall layer 1, middle parietal layer 3 and the outer wall layer 2 of lamination successively, wherein,
Inner wall layer 1 consists of Inco nickel 690 materials respectively with outer wall layer 2, and middle parietal layer 3 consists of Graphene, and wherein, the thickness of inner wall layer 1 and outer wall layer 2 is respectively 0.45～0.9mm, and middle parietal layer 3 thickness are 0.1～0.2mm;
U-shaped tube wall is thick is 1～2mm;
Middle parietal layer 3 is formed in inner wall layer 1 by CVD method, and outer wall layer 2 is coated with and casts from middle parietal layer 3.
(9) according to a kind of U-shaped pipe with graphene layer as above (1) described, it is characterized in that circulation one circuit cools agent in described U-shaped pipe pipe, the U-shaped pipe pipe secondary circuit cooling agent that circulates outward.
A kind of U-shaped pipe with graphene layer providing according to the utility model, has following beneficial effect:
(1) by the use of grapheme material, reduced U-shaped pipe thermal resistance, effectively improve the capacity of heat transmission of Steam Generator U pipe, thereby increased by one, the heat transfer efficiency of secondary coolant circuit system, improve nuclear power plant's generating efficiency, increase economic benefit;
(2) effectively improve high temperature resistant, corrosion resistance and the mechanical strength of U-shaped pipe, thereby improved its security, stability, not fragile, from a long-term perspective, there is considerable economy;
(3) appearance and size of design U-shaped pipe is identical with existing general U-shaped pipe appearance and size, thereby can keep steam generator structure not change, the use of the U-shaped pipe that therefore can not provide due to the utility model causes the reconstruction of nuclear power station, is convenient to promoting the use of of U-shaped pipe.
Accompanying drawing explanation
Fig. 1 illustrates according to the drawing in side sectional elevation of the U-shaped pipe of the utility model preferred embodiment ();
Fig. 2 illustrates according to the profilograph of the U-shaped pipe of the utility model preferred embodiment ();
Fig. 3 illustrates according to the profilograph of the U-shaped pipe of the utility model preferred embodiment (two);
Fig. 4 illustrates according to the drawing in side sectional elevation of the U-shaped pipe of the utility model preferred embodiment (two);
Fig. 5 illustrates according to the profilograph of the U-shaped pipe of the utility model preferred embodiment (three);
Fig. 6 illustrates according to the drawing in side sectional elevation of the U-shaped pipe of the utility model preferred embodiment (three).
Drawing reference numeral explanation:
1-inner wall layer;
2-outer wall layer;
Parietal layer in 3-.
The specific embodiment
By the specific embodiment, further explain and describe the utility model content below, but embodiment should not be understood to the restriction to the utility model protection domain.
Here special-purpose word " exemplary " means " as example, embodiment or illustrative ".Here as " exemplary " illustrated any embodiment, needn't be interpreted as being better than or being better than other embodiment.Although the various aspects of embodiment shown in the drawings, unless otherwise indicated, needn't draw accompanying drawing in proportion.
The utility model is disclosed is that a kind of heat transfer efficiency is high, corrosion resistance and good, and the safe and reliable U-shaped pipe with graphene layer, particularly:
The U-shaped pipe with graphene layer that the utility model provides, is characterized in that: this has the U-shaped pipe of graphene layer for the steam generator of nuclear power station one circuit system, and it comprises the body taking the shape of the letter U, two side pipes of body are cylindrical tube shape, its tube wall comprises graphene layer, wherein
The external diameter of U-shaped pipe is 17～22mm, and U-shaped tube wall thickness is 1～2mm;
The thickness of graphene layer is 0.08～0.2mm;
The side pipe openend of U-shaped pipe body is set up annular resistance piece.
Single-layer graphene is a kind of new material of the individual layer laminated structure consisting of carbon atom, it forms with sp2 hybridized orbit the flat film that hexangle type is honeycomb lattice by carbon atom, be the two-dimensional material of only having a carbon atom thickness, be considered to plane polycyclic aromatic hydrocarbons (PAH) atomic crystal.Therefore, Graphene is that the thinnest while is also the hardest nano material in the world at present; Also be that Graphene has chemical inertness due to its above-mentioned special construction, though under HTHP generally also not with other material generation chemical reaction, there is the performance of good corrosion-and high-temp-resistant; Graphene has the extremely strong capacity of heat transmission, and thermal conductivity factor is up to 5300W/mK, higher than CNT and diamond.Therefore, the utility model adopts Graphene as the material that improves U-shaped pipe performance.
Graphene described in the utility model is multi-layer graphene, and its number of plies is 5.5 * 10
4～1.5 * 10
6layer, interlamellar spacing is 0.34nm, gross thickness is 0.08～0.2mm.
In the utility model, the appearance and size of design U-shaped pipe is identical with existing general U-shaped pipe appearance and size, thereby can keep steam generator structure not change, the use of the U-shaped pipe that therefore can not provide due to the utility model causes the reconstruction of nuclear power station, is convenient to promoting the use of of U-shaped pipe; Meanwhile, because the mechanical strength of multi-layer graphene is large, high temperature high voltage resistant decay resistance is remarkable, therefore can reduce pipe thickness, thereby saves material, saves cost.
Under the effect of high-voltage high-speed fluid impact, may there is relative sliding in multi-layer graphene interlayer, thereby cause the distortion of U-shaped tubular construction, and then cause heat transfer deterioration, yet Graphene slides and easily carries out in the plane, it is difficult for occurring relative sliding at U-shaped pipe sweep, and at both sides tube portion, relative sliding easily occurs, so the utility model arranges annular resistance piece at the side pipe openend of U-shaped pipe body, hinders this relative sliding.
A kind of U-shaped pipe with graphene layer is being provided according to the utility model, and this U-shaped tube wall comprises graphene layer.
Graphene layer can adopt CVD method, i.e. CVD method preparation.CVD method as growing graphene layer, in prior art, there is relevant report, Large area few-layer graphenegraphite films as transparent thin conducting electrodes for example, Applied physics letters 95,123115,2009; Large-scale growth of grapheme films for stretchable transparent electrodes, Nature, doi:10.1038/nature07719.
In the utility model, inventor finds through research, be suitable in the condition of the utility model graphene layer growth as follows: growth gasses is by methane, methane passes into speed 15～25sccm, growth temperature is 920～980 ℃, growth time is 30～60 minutes, and cooling rate is 10 ℃/min, and cooling last temperature is room temperature.
As depicted in figs. 1 and 2, the described U-shaped tube wall with graphene layer consists of multi-layer graphene completely preferred embodiment in (one) according to one of the present utility model, thickness is 0.08～0.12mm.
The U-shaped pipe that this comprises graphene layer is manufactured by the following method:
It is 17～22mm that methane is passed into internal diameter, temperature is the inner surface 30～60 minutes of Inco nickel 690 pipes of 920～980 ℃, methane is decomposed at the inner surface of Inco nickel 690 pipes, and in cooling rate, be under the condition of 10 ℃/min, be cooled to room temperature, thereby form the thick graphene layer of 0.08～0.12mm.
In the time of in U-shaped pipe is flowed through in a circuit cools agent, heat is passed to secondary circuit cooling agent from a circuit cools agent via Graphene parietal layer.
At another preferred embodiment in (two), as shown in Figure 3 and Figure 4, the described U-shaped pipe with graphene layer comprises inner wall layer 1 and the outer wall layer 2 of lamination, wherein inner wall layer 1 or outer wall layer 2 consist of Graphene, its thickness is 0.1～0.2mm, its another layer is that Inco nickel 690 materials form, and its thickness is 0.9～1.8mm.
Wherein, the U-shaped pipe that this comprises graphene layer is manufactured by following steps: it is 20～21mm (or external diameter is 21.8～21.9mm) that methane is passed into internal diameter, temperature is the inner surface (or outer surface) 30～60 minutes of Inco nickel 690 pipes of 920～980 ℃, make methane in upper decomposition of inner surface (or outer surface) of Inco nickel 690 pipes, and in cooling rate, be under the condition of 10 ℃/min, be cooled to room temperature, thereby form the thick graphene layer of 0.1～0.2mm.
In the time of in U-shaped pipe is flowed through in a circuit cools agent, heat is passed to secondary circuit cooling agent via inner wall layer 1, outer wall layer 2 successively from a circuit cools agent, particularly, heat is passed to inner wall layer 1 inner surface from a circuit cools agent, through inner wall layer 1, reach outer wall layer 2 inner surfaces, through the heat conduction of outer wall layer 2, heat is passed to secondary circuit cooling agent by outer wall layer 2 outer surfaces again.
At another preferred embodiment in (three), as shown in Figure 5 and Figure 6, the described U-shaped pipe with graphene layer comprises the inner wall layer of lamination (1), middle parietal layer (3) and outer wall layer (2) successively, wherein inner wall layer 1 and outer wall layer 2 consist of Graphene, its thickness is 0.1～0.2mm, middle parietal layer 3 You Yin section 690 materials form, and its thickness is 0.8～1.6mm; Or inner wall layer 1 and outer wall layer 2 consist of Inco nickel 690 materials, its thickness is 0.45～0.9mm, and middle parietal layer 3 consists of Graphene, and its thickness is 0.1～0.2mm.
Wherein, this U-shaped pipe that comprises graphene layer obtains by following steps manufacture:
By methane, by internal diameter, be 19.9～22mm, temperature is the outer surface 30～60 minutes of Inco nickel 690 materials of 920～980 ℃, methane is decomposed on its outer surface, and in cooling rate, be under the condition of 8～12 ℃/min, be cooled to room temperature, thereby form the thick graphene layer of 0.1～0.2mm, continue Inco nickel 690 materials in graphene layer surface-coated molten state, 690 layers of the Inco nickels that formation thickness is 0.45～0.9mm.
In the time of in U-shaped pipe is flowed through in a circuit cools agent, heat is passed to secondary circuit cooling agent via inner wall layer 1, middle parietal layer 3, outer wall layer 2 successively from a circuit cools agent, particularly, heat is passed to inner wall layer 1 inner surface from a circuit cools agent, via inner wall layer 1, be passed to middle parietal layer 3, again by parietal layer 3 be passed to outer wall layer 2, heat reaches secondary circuit cooling agent by outer wall layer 3 outer surfaces.
The U-shaped pipe with graphene layer providing according to the utility model, has following advantage:
The first, by the use of grapheme material, reduced U-shaped pipe thermal resistance, effectively improve the capacity of heat transmission of Steam Generator U pipe, thereby increased by one, the heat transfer efficiency of secondary coolant circuit system, improve nuclear power plant's generating efficiency, increase economic benefit;
The second, effectively improve high temperature resistant, corrosion resistance and the mechanical strength of U-shaped pipe, thereby improved its security, stability, not fragile, from a long-term perspective, there is considerable economy;
The 3rd, the appearance and size of design U-shaped pipe is identical with existing general U-shaped pipe appearance and size, thereby can keep steam generator structure not change, the use of the U-shaped pipe that therefore can not provide due to the utility model causes the reconstruction of nuclear power station, is convenient to promoting the use of of U-shaped pipe.
embodiment
Embodiment 1
The present embodiment adopts CVD method to prepare graphene layer, wherein, growth gasses is methane, methane passes into speed 20sccm, and growth temperature is 950 ℃, and growth time is 60 minutes, the internal diameter of Inco nickel 690 pipes is 21mm, cooling rate is 8 ℃/s, is cooled to room temperature, thereby forms the thick straight tube-like graphene layer of 0.2mm.
The hot strength 1000Gpa of this U-shaped pipe, Young's modulus 1060Gpa,
Thermal resistance is 1.13 * 10
-3m
2k/w.
Embodiment 2
The present embodiment adopts CVD method to prepare graphene layer, wherein, growth gasses is methane, and methane passes into speed 22sccm, and growth temperature is 980 ℃, growth time is 40 minutes, the external diameter of Inco nickel 690 pipes is 21.8mm, and methane is decomposed on the outer surface of Inco nickel 690 pipes, and cooling rate is 10 ℃/s, be cooled to room temperature, thereby form the thick graphene layer of 0.2mm.
The hot strength 1000Gpa of this U-shaped pipe, Young's modulus 1060Gpa,
Thermal resistance is 1.65 * 10
-3m
2k/w.
Embodiment 3
The present embodiment adopts CVD method to prepare graphene layer, wherein, growth gasses is methane, and methane passes into speed 22sccm, and growth temperature is 980 ℃, growth time is 40 minutes, the external diameter of Inco nickel 690 pipes is 21.8mm, and methane is decomposed on the outer surface of Inco nickel 690 pipes, and cooling rate is 10 ℃/s, be cooled to room temperature, thereby form the thick graphene layer of 0.2mm.
The hot strength 1000Gpa of this U-shaped pipe, Young's modulus 1060Gpa,
Thermal resistance is 1.70 * 10
-3m
2k/w.
Embodiment 4
The present embodiment adopts CVD method to prepare graphene layer, wherein, growth gasses is methane, and methane passes into speed 25sccm, and growth temperature is 930 ℃, growth time is 50 minutes, the external diameter of Inco nickel 690 pipes is 21.1mm, and internal diameter is 19.9mm, and cooling rate is 8 ℃/s, be cooled to room temperature, thereby form respectively at Inco nickel 690 inside pipe walls and outer wall the graphene layer that 0.9mm is thick.
The hot strength 1000Gpa of this U-shaped pipe, Young's modulus 1060Gpa,
Thermal resistance is 2.23 * 10
-3m
2k/w.
Embodiment 5
The present embodiment adopts CVD method to prepare graphene layer, wherein, growth gasses is methane, and methane passes into speed 18sccm, growth temperature is 960 ℃, growth time is 45 minutes, and the internal diameter of Inco nickel 690 pipes is 19.9mm, and cooling rate is 12 ℃/s, be cooled to room temperature, thereby at Inco nickel 690 inside pipe walls and outer wall, form respectively the graphene layer that 0.9mm is thick, continue Inco nickel 690 materials in graphene layer surface-coated molten state, 690 layers of the Inco nickels that formation thickness is 0.9mm.
The hot strength 1000Gpa of this U-shaped pipe, Young's modulus 1060Gpa,
Thermal resistance is 2.39 * 10
-3m
2k/w.
Comparative example
This comparative example is that external diameter is 22mm, the U-shaped pipe of Inco nickel 690 materials that wall thickness is 2mm, and its mechanical strength, heat transfer efficiency, the experimental datas such as corrosion resistance are as follows:
Its hot strength is 1200Mpa, Young's modulus 9000Mpa,
Thermal resistance is 2.64 * 10
-3～3.52 * 10
-3m
2k/w.
The above combination specific embodiment and exemplary example have been described in detail the utility model, but these explanations can not be interpreted as restriction of the present utility model.It will be appreciated by those skilled in the art that in the situation that not departing from the utility model spirit and scope, can carry out multiple replacement of equal value, modify or improve technical solutions of the utility model and embodiment thereof, these all fall in scope of the present utility model.Protection domain of the present utility model is as the criterion with claims.
Claims (9)
1. a U-shaped pipe with graphene layer, is characterized in that: this has the U-shaped pipe of graphene layer for the steam generator of nuclear power station one circuit system, and it comprises the body taking the shape of the letter U, and two side pipes of body are cylindrical tube shape, and its tube wall comprises graphene layer, wherein,
The external diameter of U-shaped pipe is 17～22mm, and U-shaped tube wall thickness is 0.08～2mm;
The thickness of graphene layer is 0.08～0.2mm;
The side pipe openend of U-shaped pipe body is set up annular resistance piece.
2. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, described Graphene is multi-layer graphene.
3. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, described annular resistance piece is arranged at the side pipe openend 1～5cm place apart from body.
4. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, described U-shaped tube wall consists of graphene layer, and wherein, U-shaped tube wall thickness is 0.08～0.12mm.
5. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, described U-shaped tube wall comprises inner wall layer (1) and the outer wall layer (2) of lamination, wherein,
Inner wall layer (1) consists of Inco nickel 690 materials, and outer wall layer (2) consists of graphene layer, and wherein, the thickness of inner wall layer (1) is 0.9～1.8mm, and outer wall layer (2) thickness is 0.1～0.2mm;
U-shaped tube wall is thick is 1～2mm;
Outer wall layer (2) is formed in inner wall layer (1) by CVD method.
6. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, described U-shaped tube wall comprises inner wall layer (1) and the outer wall layer (2) of lamination, wherein,
Inner wall layer (1) consists of Graphene, and outer wall layer (2) consists of Inco nickel 690 materials, and wherein, the thickness of inner wall layer (1) is 0.1～0.2mm, and outer wall layer (2) thickness is 0.9～1.8mm;
U-shaped tube wall is thick is 1～2mm; Inner wall layer (1) is formed on outer wall layer (2).
7. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, described U-shaped tube wall comprises the inner wall layer of lamination (1), middle parietal layer (3) and outer wall layer (2) successively, wherein,
Inner wall layer (1) consists of Graphene respectively with outer wall layer (2), middle parietal layer (3) consists of Inco nickel 690 materials, wherein, the thickness of inner wall layer (1) and outer wall layer (2) is respectively 0.1～0.2mm, and middle parietal layer (3) thickness is 0.8～1.6mm;
U-shaped tube wall is thick is 1～2mm; Inner wall layer (1) and outer wall layer (2) are formed at respectively on middle parietal layer (3).
8. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, described U-shaped tube wall comprises the inner wall layer of lamination (1), middle parietal layer (3) and outer wall layer (2) successively, wherein,
Inner wall layer (1) consists of Inco nickel 690 materials respectively with outer wall layer (2), middle parietal layer (3) consists of Graphene, wherein, the thickness of inner wall layer (1) and outer wall layer (2) is respectively 0.45～0.9mm, and middle parietal layer (3) thickness is 0.1～0.2mm;
U-shaped tube wall is thick is 1～2mm;
It is upper that middle parietal layer (3) is formed at inner wall layer (1) by CVD method, and outer wall layer (2) is coated with and casts from middle parietal layer (3).
9. a kind of U-shaped pipe with graphene layer according to claim 1, is characterized in that, circulation one circuit cools agent in described U-shaped pipe pipe, the U-shaped pipe pipe secondary circuit cooling agent that circulates outward.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654876A (en) * | 2015-03-05 | 2015-05-27 | 苏州市凯业金属制品有限公司 | Corrosion-resistant U-shaped tube |
| CN106802106A (en) * | 2017-02-21 | 2017-06-06 | 广东万家乐燃气具有限公司 | A kind of etch-proof heat exchanger preparation method with Graphene diaphragm of heat transfer efficient |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654876A (en) * | 2015-03-05 | 2015-05-27 | 苏州市凯业金属制品有限公司 | Corrosion-resistant U-shaped tube |
| CN106802106A (en) * | 2017-02-21 | 2017-06-06 | 广东万家乐燃气具有限公司 | A kind of etch-proof heat exchanger preparation method with Graphene diaphragm of heat transfer efficient |
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