CN102226487A - Heat-supply three-layer casing system based on countercurrent heat exchange principle - Google Patents
Heat-supply three-layer casing system based on countercurrent heat exchange principle Download PDFInfo
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- CN102226487A CN102226487A CN2011101026537A CN201110102653A CN102226487A CN 102226487 A CN102226487 A CN 102226487A CN 2011101026537 A CN2011101026537 A CN 2011101026537A CN 201110102653 A CN201110102653 A CN 201110102653A CN 102226487 A CN102226487 A CN 102226487A
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Abstract
The invention provides a heat-supply three-layer casing system based on a countercurrent heat exchange principle. A thermal fluid flows through an inner pipe, a reflux cold fluid flows through an annular space between an inner pipe and an outer pipe, thermal insulating layers are wrapped on the outer walls of the inner and outer pipes, a layer of intermediate pipe is wrapped on the thermal insulating layer of the outer wall of the inner pipe so as to absorb the expansion of the inner pipe and the outer thermal insulating layer, and a certain gap is reserved between the intermediate pipe and the thermal insulating layer of the out wall of the inner pipe. The system provided by the invention can be used for overcoming the problems that the outer wall surfaces of the cold and heat pipes radiate heat to the surrounding medium in the traditional heat-supply process, the lost heat of the thermal fluid are all brought back by the cold fluid, and only the cold fluid radiates heat to the surrounding medium through the outer pipe; and the temperature gradient of the outer wall of a cold fluid pipe and the environment medium is smaller than that of the outer pipe wall of the thermal fluid and the environmental medium in the traditional mode, thus the heat dissipation with a larger temperature difference between a thermal fluid pipe wall and the environmental medium can be avoided and the heat-dissipating loss of a heat-supply pipeline can be greatly reduced.
Description
Technical field
The present invention relates to a kind of heat delivered switch, particularly a kind of defeated hot three layers of cannula system based on the counter-flowing heat exchange principle.
Background technique
In industrial and agricultural production and daily life, heat supply has a wide range of applications, with we production and live closely bound up.Traditional defeated hot mode mostly is aerial pipeline or ground-based duct, carry hot fluid pipeline and returned cold fluid line independent separately, only be to be surrounded by thermal insulation layer at pipeline outer wall separately to expose in environment, but the outer wall temperature of cold and hot pipe insulating layer still is higher than ambient temperature, heat dissipating capacity is bigger, especially the heat dissipating capacity of hot channel is bigger, causes very big heat waste.
Summary of the invention
Technical problem to be solved by this invention provides a kind of defeated hot three layers of cannula system based on the counter-flowing heat exchange principle, and its thermal loss is little, compact structure, the simple and reliable property of technology are strong.
The present invention is based on defeated hot three layers of cannula system of counter-flowing heat exchange principle, include the outer tube and the interior pipe of hollow, the two ends of interior pipe connect the hot fluid outlet of heat supply source end and the hot fluid inlet of hot user side respectively, the two ends of outer tube connect the cold fluid outlet of hot user side and the returned cold fluid input of heat supply source end respectively, pipe thermal insulation layer in the outer wall of interior pipe is coated with, the outer wall of outer tube is coated with the outer tube thermal insulation layer, interior pipe thermal insulation layer outer wall is with intervalve, forms the annular space of hollow between intervalve and the outer tube.
As the preferred embodiments of the present invention, leave tiny gap between described intervalve and the interior pipe thermal insulation layer;
As the preferred embodiments of the present invention, be provided with a plurality of supporting frames between described intervalve and the outer tube vertically, described outer tube inboard is provided with conduit, and an end of support frame as described above is fixedly connected on the intervalve, and the other end is connected in the conduit of outer tube movably;
As the preferred embodiments of the present invention, aperture evenly is set on support frame as described above, make that supported separated working medium can flow mutually in the outer tube.
As the preferred embodiments of the present invention, adopt flange plate to connect in the described front and back between the pipe, adopt between the intervalve of front and back to have externally threaded silk to be connected, adopt flange plate to connect between the outer tube of front and back;
As the preferred embodiments of the present invention, interior pipe in the installation process, intervalve, the joint of outer tube does not line up.
The defeated hot three layers of cannula system that the present invention is based on the counter-flowing heat exchange principle have the following advantages at least: when carrying out heat transport by apparatus of the present invention, hot fluid flows through from interior pipe, flows through the annular space of cold fluid between intervalve and outer tube.Because the temperature of returned cold fluid is generally speaking greater than the temperature of surrounding environment, be the heat transfer temperature difference of the heat transfer temperature difference of hot fluid and cold fluid less than cold fluid and environmental gas, hot fluid heat radiation of environment towards periphery when so hot fluid is less than the use conventional pipelines to the heat radiation of cold fluid, so both can reduce the loss of hot fluid heat in course of conveying, simultaneously, the heat of this part loss is taken back by cold fluid, avoided being lost to and caused waste in the environment, reduced the loss of heat delivery process to greatest extent.
Description of drawings
Fig. 1 is the structural representation that the present invention is based on defeated hot three layers of cannula system of counter-flowing heat exchange principle;
Fig. 2 be among Fig. 1 along A-A to sectional view;
Fig. 3 is the Placement figure of interior pipe in the installation process;
Fig. 4 is the Placement figure of intervalve in the installation process;
Fig. 5 is the Placement figure of installation process middle external tube.
The following expression of label among the figure:
| 1 | Interior pipe | 2 | Outer tube |
| 3 | The hot fluid outlet of heat supply source end | 4 | The hot fluid inlet of hot user side |
| 5 | The cold fluid outlet of hot user side | 6 | The returned cold fluid input of heat |
| 7 | Interior pipe |
8 | The outer tube |
| 9 | Intervalve | 10 | |
| 11 | |
12 | To |
| 13 | Outer pipe flange |
Embodiment
Below in conjunction with accompanying drawing, the defeated hot three layers of cannula system that the present invention is based on the counter-flowing heat exchange principle are done detailed description:
Referring to accompanying drawing 1 to shown in Figure 5, the defeated hot three layers of cannula system that the present invention is based on the counter-flowing heat exchange principle include the outer tube 2 and the interior pipe 1 of hollow, the two ends of interior pipe 1 connect the hot fluid outlet 3 of heat supply source end respectively and the hot fluid of hot user side enters the mouth 4, the two ends of outer tube 2 connect the cold fluid outlet 5 of hot user side and the returned cold fluid input 6 of heat supply source end respectively, pipe thermal insulation layer 7 in the outer wall of interior pipe 1 is coated with, the outer wall of outer tube 2 is coated with outer tube thermal insulation layer 8, interior pipe thermal insulation layer 7 outer walls are with intervalve 9, expansion for pipe 1 and interior pipe 7 thermal insulation layers in absorbing, leave certain clearance between intervalve 9 and the interior pipe thermal insulation layer 7, and the annular space of the hollow that forms between intervalve 9 and the outer tube 2.
During heat delivered, hot fluid flows through from interior pipe 1, flows through the annular space of cold fluid between intervalve 9 and outer tube 2.Because the temperature of returned cold fluid is generally speaking greater than the temperature of surrounding environment, be the heat transfer temperature difference of the heat transfer temperature difference of hot fluid and cold fluid less than cold fluid and environmental gas, hot fluid heat radiation of environment towards periphery when so hot fluid is less than the use conventional pipelines to the heat radiation of cold fluid, so both can reduce the loss of hot fluid heat in course of conveying, simultaneously, the heat of this part loss is taken back by cold fluid, avoided being lost to and caused waste in the environment, reduced the loss of heat delivery process to greatest extent.
Need to prove: because in the defeated thermal process, the temperature of conveying hot fluid pipeline will be apparently higher than the temperature of environment, and the thermal loss in traditional heat supply pipeline mainly is to carry the radiation loss and the radiation loss of carrying cold fluid pipeline to environment of hot fluid pipeline to environment, obviously, the hot fluid pipeline is greater than the radiation loss of cold fluid pipeline to environment to the radiation loss of environment.In structure of the present invention, pipe thermal insulation layer 7 in being coated with between interior pipe 1 and the intervalve 9, reduced the heat conduction amount of cold fluid between inside pipe 1 of interior pipe hot fluid and the intervalve 9, also reduced simultaneously the temperature of outer tube 2 outer surfaces, reduce outer tube 2 environment heat radiation towards periphery, and then reduced the thermal loss of whole system.In addition, support between intervalve 9 and the outer tube 2 is to be finished by the supporting frame of arranging vertically 10, on supporting frame 10, be with holes at a certain distance, make that supported 10 separated working medium can flow mutually in the outer tube 2, guarantee hydrodynamic pressure and uniformity of temperature profile in the annular space, therefore, the present invention can effectively reduce the thermal loss of conveying hot fluid pipeline and this part thermal loss is taken back by the returned cold fluid, reduces radiation loss significantly.
Described interior pipe thermal insulation layer 7 is made by the good heat insulation effect asbestos material, and concrete thickness should be looked the temperature difference of defeated hot distance and cold fluid and hot fluid and determine, should reduce thickness as far as possible under the prerequisite that reaches the insulation requirement, thereby reduces overall dimensions.
The heat supply hot fluid flows through from interior pipe 1, and fluid temperature (F.T.) reduces after the thermotropism user heat supply, becomes the returned cold fluid, flows back in the annular space of outer tube 2 and intervalve 9.In traditional heating mode, hot fluid pipeline and cold fluid pipeline all are just to place environment behind the outsourcing thermal insulation layer, and two pipelines all dispel the heat to the external world, especially hot fluid pipeline, because fluid temperature (F.T.) is higher, causes outsourcing thermal insulation layer external temperature still higher, and is bigger to extraneous heat dissipating capacity.Heat supply pipeline of the present invention, the outer tube 2 of cold fluid flow warp is placed in interior pipe 1 outside of flow of heated fluid warp, because the temperature of returned cold fluid still is higher than the surrounding medium temperature, and between the inner and outer pipes 1,2 thermal insulation layer is housed, so the heat dissipating capacity of hot fluid is less than the heat dissipating capacity that hot fluid pipeline in traditional heat supply directly places surrounding medium in the interior pipe 1, make flow of heated fluid reduce, reduce the thermal loss in the heat delivery process through the temperature reduction value of heat supply pipeline; Simultaneously, this part heat radiation is taken back by cold fluid again, and having reduced directly scatters and disappears causes heat loss to environment.Wherein, the outer tube 2 outer outer tube thermal insulation layers 8 that coat have reduced the heat radiation of returned cold fluid to environment.
Because heat loss main in traditional heat supply is from the hot fluid pipeline, and the heat of hot fluid pipe loss not only reduces among the present invention, and major part is taken back by the returned cold fluid, differ less when the heat of cold fluid loss and traditional heat supply, thereby improved whole efficiency greatly, reduced radiation loss.The interior pipe thermal insulation layer that outer wall of inner tube coats, reduced the heat conduction amount of hot fluid annular space cold fluid between intervalve 9 and outer tube 2 in the interior pipe, guarantee the hot fluid quality, the temperature that causes outer tube 2 outer surfaces rises because endothermic temperature rises thereby also avoided cold fluid in the outer tube 2 simultaneously, controlled of the heat radiation of outer tube cold fluid, reduced the thermal loss of whole system to environment.Adopt heat supply pipeline of the present invention, can also reduce installation cost, the situation of having avoided traditional heat supply pipeline need set up two pipelines is saved the space.
Three layers of sleeve pipe of the defeated heat of the present invention take following measure to guarantee the smooth implementation of this technology in manufacturing and installation process: the interior pipe 1 of defeated thermal sleeve, intervalve 9 are branch body structures with outer tube 2, weld with interior pipe flange 11 and outer pipe flange 13 respectively at interior pipe 1 and outer tube 2 two ends, all there is one section internal thread at intervalve 9 two ends, are beneficial in installation process pipeline and take different Placements.After in interior pipe 1 outer wall coats, managing thermal insulation layer 7, put intervalve 9 and outer tube 2, in pipe 1, intervalve 9 and outer tube 2 all can relative movement, and being uneven in length of interior pipe 1, intervalve 9 and outer tube 2, the joint that is each pipeline in the installation process can not align, help carrying out from inside to outside the installation of pipeline, the two ends of pipe 1 in starting point of heat supply pipeline (heat supply source end) and terminal (hot user side) are installed in respectively.
Installation process from inside to outside, interior pipe 1 connects by interior pipe flange 11, manages thermal insulation layer 7 then the outer wall of interior pipe 1 adds in, the thickness of interior pipe thermal insulation layer is greater than the size of interior pipe flange 11; In then intervalve 9 being enclosed within outside pipe 1 thermal insulation layer, intervalve 9 adopts to have and externally threaded silk 12 is connected, and silk 12 is enclosed within on the interior pipe 1 after the insulation, guarantees that two sections intervalves 9 closely connect; Overlap upper exterior tube 2 then, outer tube 2 is consistent with the Placement of interior pipe 1, adopts outer pipe flange 13 to connect, and installs the back and coats outer tube thermal insulation layer 8.In pipe 1, intervalve 9 and outer tube 2 all can relative movement before heat supply pipeline is installed, relative fixed then after heat supply pipeline is installed.In still and between the intervalve 9 leave certain clearance after guaranteeing temperature, the expanded by heating of pipe 1 and interior pipe thermal insulation layer 7 in both can having absorbed, can also guarantee in installation process, to allow some leeway between the intervalve 9 and interior pipe 1, support between intervalve 9 and the outer tube 2 is to be finished by supporting frame 10 vertically, this supporting frame 10 is integrally welded with intervalve 9, at the conduit of outer tube 2 disposed inboard supporting frames, be beneficial to the relative movement between the intervalve 9 and outer tube 2 in installation process.Punching at a certain distance guarantees hydrodynamic pressure and uniformity of temperature profile in the annular space on supporting frame 10.
Below, specify in conjunction with the embodiments:
Example 1: thermal insulating material is got asbestos wool, and thermal conductivity is 0.077W/ (mK), and the heat supply distance is ten thousand metres, and ambient temperature is 0 ℃, and heat source section hot fluid outlet steam temperature is 255.8 ℃, and pressure is 4 * 10
-4Pa, mass flow rate is 10kg/s, hot user side cold fluid outlet temperature is 130 ℃.
(1) if adopt traditional heat supply pipeline, be provided with respectively and carry hot fluid pipeline and returned cold fluid line, outer diameter tube is 150mm, insulation layer thickness is 60mm.If hot user side hot fluid inlet temperature is t
1, then the pipeline mean temperature is
Calculate for simplifying, think that the thermal resistance of tube wall is compared with thermal insulation layer and can be ignored, calculate with the mean temperature of pipeline.If thermal insulation layer outer wall mean temperature is t
2, then have
Φ
2′＝cm(300-t
1)
Φ
3′＝h(t
2-0)
Wherein
In the formula:
Φ
1'---heat flow/W that pipeline scatters and disappears to the thermal insulation layer outer wall;
Φ
2'---the heat flow/W that scatters and disappears in the fluid temperature (F.T.) reduction process in the pipeline;
Φ
3'---heat flow/W that the thermal insulation layer outer wall scatters and disappears to environment;
r
1---outer diameter tube/m;
r
2---pipeline installs the external diameter/m behind the thermal insulation layer additional;
λ---thermal insulation layer thermal conductivity/W (mK)
-1
L---duct length/m;
C---working medium specific heat capacity/J (kgK)
-1
M---working medium quality/kg;
H---thermal insulation layer outer wall convective surface heat-transfer coefficient/W (m
2K)
-1
Gr---grashof number;
Pr---Prandtl number;
Nu---nusselt number.
Φ when easily knowing stable state
1'=Φ
2'=Φ
3', suppose thermal insulation layer outer wall mean temperature t earlier
2,, calculate hot user side hot fluid inlet temperature t through iteration repeatedly
1=221.3 ℃, hot fluid pipe insulating layer outer wall mean temperature is t
2=43.2 ℃, loses heat Φ=1698897W.
The returned cold fluid is considered in like manner calculating and can getting heat source end cold fluid inlet temperature is 95.9 ℃, cold fluid pipeline thermal insulation layer outer wall mean temperature is 22.7 ℃, loses heat Φ=738139W.
(2) after the sleeved pipe among employing the present invention, establishing the hot fluid mean temperature is t
3, the cold fluid mean temperature is t
4, outer tube thermal insulation layer outer wall temperature is t
5, interior external diameter of pipe still is 150mm, and the insulation layer thickness of outer wall of inner tube is 60mm, and outer external diameter of pipe must be 308mm as calculated, and the thickness of outer tube outsourcing thermal insulation layer is 60mm, according to the result of calculation in the conventional pipelines, supposes that at first the cold fluid mean temperature is 110 ℃, has
Φ
2=cm (300-t
The heat inlet)
Φ
4＝h(t
5-0)
Φ
5=cm (130-t
Cold inlet)
In the formula:
Φ
1---in seeing through, guarantees hot fluid the heat flow/W of warm course cold fluid conduction;
Φ
2---heat flow/W that temperature reduction process is scattered and disappeared in the hot fluid flow in the interior pipe;
Φ
3---heat flow/W that cold fluid scatters and disappears to outsourcing thermal insulation layer outer wall in the outer tube;
Φ
4---heat flow/W that outer tube outsourcing thermal insulation layer outer wall is scattered and disappeared to environment;
Φ
5---heat flow/W that temperature reduction process was scattered and disappeared during cold fluid flowed in the outer tube;
r
1---interior external diameter of pipe/m;
r
2---interior pipe installs external diameter/m behind the thermal insulation layer additional;
r
3---outer external diameter of pipe/m;
r
4---outer tube installs external diameter/m behind the thermal insulation layer additional;
t
The heat inlet---hot user side hot fluid inlet temperature/℃;
t
Cold inlet---heat source end cold fluid inlet temperature/℃;
λ---thermal insulation layer thermal conductivity/W (mK)
-1
L---duct length/m;
C---working medium specific heat capacity/J (kgK)
-1
M---working medium quality/kg;
H---pipeline convective surface heat-transfer coefficient/W (m
2K)
-1
During stable state, Φ
1=Φ
2, Φ
3=Φ
4, Φ
5=Φ
1-Φ
3Through repeatedly getting after the iteration, outer tube thermal insulation layer outer wall temperature is 26.5 ℃, heat source end cold fluid inlet temperature is 117.6 ℃, and hot user side hot fluid inlet temperature is 231.1 ℃, is higher than 221.3 ℃ when using traditional heat supply pipeline, improved thermotropism user's heat supply quality largely, to the radiation loss Φ=1294276W of external environment, the Φ=1698897+738139=2437036W during less than the traditional heat supply pipeline of use reduces thermal loss and is about 46.8%.
Example 2: thermal insulating material is got asbestos wool, and thermal conductivity is 0.077W/ (mK), and the heat supply distance is ten thousand metres, and ambient temperature is 0 ℃, and heat source section hot fluid outlet steam temperature is 255.8 ℃, and pressure is 4 * 10
-4Pa, mass flow rate is 10kg/s, hot user side cold fluid outlet temperature is 50 ℃.
(1) if adopt traditional heat supply pipeline, be provided with respectively and carry hot fluid pipeline and returned cold fluid line, outer diameter tube is 150mm, insulation layer thickness is 60mm.With the computational methods in the example 1, repeatedly can get hot user side hot fluid inlet temperature t after the iteration
1=221.3 ℃, hot fluid pipe insulating layer outer wall mean temperature is t
2=43.2 ℃, loses heat Φ
Heat=1698897W.
In like manner can get heat source end cold fluid inlet temperature is 36.3 ℃, and cold fluid pipeline thermal insulation layer outer wall mean temperature is 11.7 ℃, loses heat Φ
Cold=257654W.
(2) after the sleeved pipe among employing the present invention, with the computational methods in the example 1, through repeatedly getting after the iteration, outer tube thermal insulation layer outer wall temperature is 17.6 ℃, heat source end cold fluid inlet temperature is 88.9 ℃, hot user side hot fluid inlet temperature is 224.4 ℃, be higher than 221.3 ℃ when using traditional heat supply pipeline, improved thermotropism user's heat supply quality, radiation loss Φ=747117W to the external world, Φ=1698897+257654=1956551W during less than traditional heat supply pipeline reduces heat waste and is about 61.8%
Example 3: thermal insulating material is got asbestos wool, and thermal conductivity is 0.077W/ (mK), and the heat supply distance is ten thousand metres, and ambient temperature is 20 ℃, and heat source section hot fluid outlet steam temperature is 255.8 ℃, and pressure is 4 * 10
-4Pa, mass flow rate is 10kg/s, and hot user side cold fluid outlet temperature is 130 ℃, and pressure is 2.7 * 10
5Pa.
(1) if adopt traditional heat supply pipeline, be provided with respectively and carry hot fluid pipeline and returned cold fluid line, outer diameter tube is 150mm, insulation layer thickness is 60mm.With the computational methods in the example 1, repeatedly can get hot user side hot fluid inlet temperature t after the iteration
1=225.7 ℃, hot fluid pipe insulating layer outer wall mean temperature is t
2=60.4 ℃, loses heat Φ
Heat=1436699W.269.48 ℃, hot fluid pipe insulating layer outer wall mean temperature is t
2=67.3 ℃, loses heat Φ
Heat=1789183W.
In like manner can get heat source end cold fluid inlet temperature is 101.4 ℃, and cold fluid pipeline thermal insulation layer outer wall mean temperature is 40.1 ℃, loses heat Φ
Cold=622421W.
(2) after the sleeved pipe among employing the present invention, with the computational methods in the example 1, through repeatedly getting after the iteration, outer tube thermal insulation layer outer wall temperature is 44.6 ℃, heat source end cold fluid inlet temperature is 127.4 ℃, hot user side hot fluid inlet temperature is 234.9 ℃, be higher than 225.7 ℃ when using traditional heat supply pipeline, improved thermotropism user's heat supply quality, radiation loss Φ=1207457W to the external world, Φ=1789183+622421=2411604W during less than traditional heat supply pipeline reduces heat waste and is about 49.9%.
The above only is one embodiment of the present invention, it or not whole or unique mode of execution, the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading specification of the present invention is claim of the present invention and contains.
Claims (6)
1. defeated hot three layers of cannula system based on the counter-flowing heat exchange principle, it is characterized in that: the outer tube (2) and the interior pipe (1) that include hollow, in the two ends of pipe (1) hot fluid that connects the hot fluid outlet (3) of heat supply source end and hot user side respectively enter the mouth (4), the two ends of outer tube (2) connect the cold fluid outlet (5) of hot user side and the returned cold fluid input (6) of heat supply source end respectively, pipe thermal insulation layer (7) in the outer wall of interior pipe (1) is coated with, the outer wall of outer tube (2) is coated with outer tube thermal insulation layer (8), interior pipe thermal insulation layer (7) outer wall is with intervalve (9), forms the annular space of hollow between intervalve (9) and the outer tube (2).
2. the defeated hot three layers of cannula system based on the counter-flowing heat exchange principle as claimed in claim 1 is characterized in that: leave tiny gap between described intervalve (9) and the interior pipe thermal insulation layer (7).
3. the defeated hot three layers of cannula system based on the counter-flowing heat exchange principle as claimed in claim 1, it is characterized in that: be provided with a plurality of supporting frames (10) vertically between described intervalve (9) and the outer tube (2), described outer tube (2) inboard is provided with conduit, one end of support frame as described above (10) is fixedly connected on the intervalve (9), and the other end is connected in the conduit of outer tube (2) movably.
4. the defeated hot three layers of cannula system based on the counter-flowing heat exchange principle as claimed in claim 3 is characterized in that: on support frame as described above (10) aperture is set evenly, makes that supported (10) separated working medium can flow mutually in the outer tube (2).
5. the defeated hot three layers of cannula system based on the counter-flowing heat exchange principle as claimed in claim 1, it is characterized in that: adopt flange plate (11) to connect in the described front and back between the pipe (1), before and after adopt between intervalves (9) to have and externally threaded silk (12) connected, adopt flange plate (13) to connect between the front and back outer tube (2).
6. the defeated hot three layers of cannula system based on the counter-flowing heat exchange principle as claimed in claim 1 is characterized in that: pipe in the installation process, and intervalve, the joint of outer tube does not line up.
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|---|---|---|---|
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| CN102979967A (en) * | 2012-11-29 | 2013-03-20 | 西安交通大学 | Installation structure convenient for disassembling and assembling expansion joint of heat transfer casing |
| CN102996908A (en) * | 2012-11-12 | 2013-03-27 | 华北电力大学 | Pipeline capable of reducing influence of thermal stratification |
| CN104405994A (en) * | 2014-10-27 | 2015-03-11 | 宁夏天纵泓光余热发电技术有限公司 | Energy-saving flue gas insulation pipe for submerged arc furnace |
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| CN102996908A (en) * | 2012-11-12 | 2013-03-27 | 华北电力大学 | Pipeline capable of reducing influence of thermal stratification |
| CN102996908B (en) * | 2012-11-12 | 2015-01-21 | 华北电力大学 | Pipeline capable of reducing influence of thermal stratification |
| CN102979967B (en) * | 2012-11-29 | 2015-04-15 | 西安交通大学 | Installation structure convenient for disassembling and assembling expansion joint of heat transfer casing |
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| CN104565641A (en) * | 2013-10-25 | 2015-04-29 | 上海汽车空调配件有限公司 | Pipe body connecting part for connecting coaxial pipe and aluminum pipe and connecting method thereof |
| CN104405994A (en) * | 2014-10-27 | 2015-03-11 | 宁夏天纵泓光余热发电技术有限公司 | Energy-saving flue gas insulation pipe for submerged arc furnace |
| CN109386865A (en) * | 2018-01-13 | 2019-02-26 | 陈奎宏 | Tube-in-tube and the pipe fitting for connecting tube-in-tube |
| CN108548039A (en) * | 2018-05-11 | 2018-09-18 | 上海科华热力管道有限公司 | A kind of insulating tube and the self-insulation system containing the insulating tube |
| CN108548039B (en) * | 2018-05-11 | 2019-10-29 | 上海科华热力管道有限公司 | A kind of insulating tube and the self-insulation system containing the insulating tube |
| CN109114345A (en) * | 2018-07-25 | 2019-01-01 | 山东理工大学 | Three layers of hot wind distribution pipe |
| CN113864541A (en) * | 2021-09-16 | 2021-12-31 | 华能兰州新区热电有限公司 | Central heating heat preservation heating pipeline structure |
| CN114033911A (en) * | 2021-09-23 | 2022-02-11 | 中材(北京)地热能科技有限公司 | Four-to-two communication device |
| CN114370535A (en) * | 2021-11-28 | 2022-04-19 | 大连中远海运重工有限公司 | Three-wall pipe for dangerous medium transmission |
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| CN102226487B (en) | 2012-09-05 |
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