CN108896603A - A kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device - Google Patents
A kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device Download PDFInfo
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- CN108896603A CN108896603A CN201810841314.2A CN201810841314A CN108896603A CN 108896603 A CN108896603 A CN 108896603A CN 201810841314 A CN201810841314 A CN 201810841314A CN 108896603 A CN108896603 A CN 108896603A
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- heat transfer
- heating tube
- test coupon
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- tubular test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
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Abstract
The invention discloses a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device, including heater element, the both ends of the heater element are provided with end guard assembly, and the heater element outer sheath is equipped with heating tube；When carrying out Experimental Study of Heat Transfer, there are gaps between the heating pipe outer wall and tubular test coupon inner wall；Radial baffle is arranged in the heating pipe outer wall, the gap between tubular test coupon and heating tube is divided into multiple independent heat transfer regions by the radial direction baffle in the axial direction；Longitudinal baffle is additionally provided in the heating pipe outer wall, the gap between tubular test coupon and heating tube is divided into multiple independent heat transfer regions by the longitudinal baffle in the circumferential.The present invention compensates for the technological gap for not being specially adapted for the experimental rig of tubular metal insulating layer Experimental Study of Heat Transfer in the prior art, it is bonded the heat transfer situation of tubular metal insulating layer in actual application, so that the data of Experimental Study of Heat Transfer are more accurate and have reference significance.
Description
Technical field
The present invention relates to nuclear power plant's heat-preserving equipment technical fields, and in particular to a kind of metallic insulation tubular test coupon heat transfer
Experimental rig.
Background technique
Metallic insulation is a kind of domestic Accidents on NPP and pipeline heat insulation layer structure newly ground in recent years, heat transfer
Performance needs are measured by special experimental rig.
To tubular metal insulating layer test specimen, since its structure is different from the interior geometry of tabular metallic insulation,
And hot-fluid direction of transfer is also inconsistent with tabular insulating layer, can not use domestic more mature protective hot box Experimental Study of Heat Transfer dress
It sets and carries out heat transfer property test, and the protection end-type experimental rig of tubular type specified in GB/T 10296 can not meet metal guarantor
The test request of warm layer test specimen.
Summary of the invention
It is existing to solve the purpose of the present invention is to provide a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device
The problem of test that Experimental Study of Heat Transfer device is unable to satisfy tubular metal insulating layer test specimen heat transfer property needs, it is special on probation to carry out
In the heat transfer testing that the even heat of tubular metal insulating layer test specimen is distributed and measurement accuracy is high.
The present invention is achieved through the following technical solutions：
A kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device, including heater element, the both ends of the heater element
It is provided with end guard assembly, the heater element outer sheath is equipped with heating tube；When carrying out Experimental Study of Heat Transfer, outside the heating tube
There are gaps between wall and tubular test coupon inner wall.
Currently, Experimental Study of Heat Transfer device in the prior art is difficult to meet the test of metallic insulation tubular test coupon heat transfer property
It is required that.For example, protective hot box experimental rig can not be applied to tubular test coupon, because of the structure of tubular test coupon and flat gold
The internal structure for belonging to insulating layer is different, and hot-fluid direction of transfer is also inconsistent with tabular metallic insulation；Meanwhile GB/T
10296《The measurement round tube method of insulating layer steady state heat transfer property》In also regulation tubular type protection end-type experimental rig be not able to satisfy gold
Belong to the test request of insulating layer test specimen.But the Experimental Study of Heat Transfer of metallic insulation tubular test coupon to simulation metallic insulation in core
Virtual condition on power plant's pipeline studies that its heat transfer property is most important, and therefore, there is an urgent need to design one kind dedicated for metal
The Experimental Study of Heat Transfer device of insulating layer tubular test coupon.
The present invention provides a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer devices, fill with existing heat transfer experiment
It sets equally, uses heater element as heat source, it is preferable that heater element is all kinds of resistance heating wires.The two of heater element
End is provided with end guard assembly, on the one hand end guard assembly is used to clamping and fixing tubular test coupon during the test,
On the other hand heat that heater element generates is reduced to Environment release, it is ensured that the accuracy of heating power measurement.
Unlike the prior art, the outer sheath of heater element is equipped with heating tube.Heat transfer of the inventor in tubular test coupon
It is found during test, from one end of tubular test coupon to the other end, there are apparent temperature gradients and part temperature on tubular test coupon
Non-uniform phenomenon is spent, this is because caused by the structure of heater element and the length of tubular test coupon.In order to enable fever
The heat that element generates as far as possible uniformly, is equipped with heating tube, heating tube in heater element outer sheath before transmitting to tubular test coupon
Can to heater element generate heat pre-allocate so that in heating tube heat distribution it is relatively uniform, rear heating tube
On heat be transferred on tubular test coupon again.The design of heating tube is so that heat distribution thereon is more bonded in pipeline of nuclear power plant
Actual heat distribution so that the data of Experimental Study of Heat Transfer are more accurate and have reference significance.When it is implemented, heating tube
Both ends can be contacted with end guard assembly, can not also be contacted with end guard assembly.Preferably, heating tube is stainless steel
Material, it is further preferred that the wall thickness of heating tube is 3~5mm to reach preferable heat distribution in heating tube.
In existing Experimental Study of Heat Transfer device, gap is not present between heater element and test specimen, heater element is contacted with test specimen
Direct heat transfer, but when tubular metal insulating layer is arranged in pipeline of nuclear power plant, between insulating layer and pipeline it is that there are gaps, and
Using the gap isolation conduction, therefore, existing Experimental Study of Heat Transfer device can not simulate pipeline and tubulose in pipeline of nuclear power plant
The actual installation state and heat-transfer effect of metallic insulation.To solve the above-mentioned problems, in heating pipe outer wall and tubular test coupon
Gap is arranged heating tube and tubular test coupon is isolated, it will be appreciated by those skilled in the art that between heating tube and tubular test coupon in wall
The mode being isolated can also have other numerous embodiments, and these embodiments should all fall into protection scope of the present invention
In.
In use, one piece of end guard assembly is placed on experimental bench, tubular test coupon is mounted on fixed end and is prevented
It on protecting assembly, contacts one end of tubular test coupon with end guard assembly, another piece of end guard assembly is mounted on pipe later
The other end of shape test specimen contacts the end guard assembly with tubular test coupon, is realized by two pieces of end guard assemblies to tubulose
The clamping and fixation of test specimen, while making between tubular test coupon and its internal heating tube that there are certain intervals so that tubulose examination is isolated
Part and heating tube.
By above structure, the examination for not being specially adapted for tubular metal insulating layer Experimental Study of Heat Transfer in the prior art is compensated for
Experiment device；In addition, the device realizes the preheating to heating tube by setting heating tube, so that being transmitted to the heat on tubular test coupon
More uniform, more fitting tubular metal insulating layer heat transfer situation in actual application is measured, so that the number of Experimental Study of Heat Transfer
According to more accurately and with reference significance；By the way that gap is arranged between tubular test coupon and heating tube, so that Experimental Study of Heat Transfer device
Installation condition of the tubular metal insulating layer in pipeline of nuclear power plant in closing to reality application, improves the representativeness of test data.
The presence in gap leads in gap that there are convective heat transfer for air, and forms stack effect in regional area, leads to pipe
Shape test specimen non-uniform temperature, and then influence the accuracy of heat transfer property test.In order to solve this problem, present invention edge in gap
Heating tube is radially, circumferentially provided with thermal baffle, and the air chamber in gap is made to be isolated into multiple independent heat transfer regions,
Convective heat transfer is reduced, and avoids stack effect.
Specifically, as a preferred embodiment of the invention, radial baffle, institute are arranged in the heating pipe outer wall
It states radial baffle and the gap between tubular test coupon and heating tube is divided into multiple independent heat transfer regions in the axial direction.Radial gear
Plate is using materials such as thermostable heat insulation materials, such as micarex, ceramics.Flapper gap is divided at least two pieces by radial baffle
Heat transfer region, between adjacent heat transfer region due to radial baffle, gas can not pass through, therefore can reduce in gap
High-temperature gas along heating tube central axes direction convection current, improve heat distribution uniformity, to improve the standard of experimental data
True property.Preferably, radial baffle is circular ring structure, and the central axes of radial baffle are conllinear with the central axes of heating tube.Radial gear
Connection relationship between plate and heating tube can be to be detachably connected, such as be clamped, or non-dismountable connection is for example viscous
It connects, splice or welds, it is preferable that the connection type between radial baffle and heating tube is clamping, and specific snap fit is, radial
Radial baffle is first set on the outer wall of heating tube by the internal diameter of baffle during installation slightly larger than the outer diameter of heating tube, then will pipe
Shape test specimen is set on the guard assembly of end.
Further, the quantity of the radial baffle is two pieces.Preferably, two pieces of radial baffles are along heating tube central axes side
Three sections are divided by gap.
As another preferred embodiment of the invention, longitudinal baffle is additionally provided in the heating pipe outer wall, it is described vertical
The gap between tubular test coupon and heating tube is divided into multiple independent heat transfer regions in the circumferential to baffle.In Experimental Study of Heat Transfer
It finds in the process, since high-temperature gas can rise and cryogenic gas can decline, the tubular test coupon inner wall being located above and position
There are temperature difference between the tubular test coupon inner wall of lower section, usually at 10~30 DEG C, staff needs to rely on this temperature difference
Experience makes up data difference caused by temperature difference, it is clear that the data measured in this way are not accurate enough.In order to solve the technology
Problem, is provided with longitudinal baffle in heating pipe outer wall, and the longitudinal baffle uses thermostable heat insulation material, such as mica
The materials such as plate, ceramics.In some embodiments, longitudinal baffle and radial baffle can be integral structure, for example, two pieces of radial directions
It is connected between baffle by longitudinal baffle, is also possible to be provided with clamping groove on radial baffle, is connected to card between longitudinal baffle
It is fixed in access slot.Longitudinal baffle can further separate heat transfer region along the circumferential direction of heating tube, reduce the high temperature in gap
Gas avoids the high-temperature gas in bottom thermal transfer region from flowing to the heat transfer region at top, together along the convection current of heating tube circumferential direction
When avoid top cryogenic gas flow to the heat transfer region of bottom, thus further increase heat distribution uniformity and data
The accuracy of acquisition.
Further, the quantity of the longitudinal baffle is six pieces, and six pieces of longitudinal baffles are along the circumferential uniform of heating tube
Distribution.
By arranging radial baffle and longitudinal baffle in gap, the air chamber in gap is made to form multiple independent heat transfers
Region improves the being heated evenly property of test specimen, has ensured the accuracy of test result.
Further, the end guard assembly includes test piece end protection, heating tube end protection, the test piece end
Protection is set in the outside of heating tube end protection, and the thickness of test piece end protection is less than the thickness of heating tube end protection.Institute
It states test piece end protection and heating tube end protection can be two individual components, it can also be with integrally formed component, test specimen end
The thickness that the thickness of portion's protection is less than heating tube end protection refers to that heating tube end protection protects to be formed relative to test piece end
Lug boss is to install heater element and heating tube, the inner wall of the side fitting tubular test coupon of lug boss.
Further, end thermal insulation board is provided in the heating tube end protection.End thermal insulation board can further subtract
Release of the heat that few heater element generates to environment.Preferably, the material of end thermal insulation board is micarex.
Further, the radial baffle, longitudinal baffle material be micarex.
Compared with prior art, the present invention having the following advantages and benefits：
1, the present invention compensates for the test dress for not being specially adapted for tubular metal insulating layer Experimental Study of Heat Transfer in the prior art
It sets；In addition, the device realizes the preheating to heating tube by setting heating tube, so that the heat being transmitted on tubular test coupon is more
Add uniformly, more the heat transfer situation of fitting tubular metal insulating layer in actual application, so that the data of Experimental Study of Heat Transfer are more
Add accurate and there is reference significance；Moreover, existing gap makes Experimental Study of Heat Transfer device between tubular test coupon and heating tube
Installation condition of the tubular metal insulating layer in pipeline of nuclear power plant in closing to reality application, thus improve the representative of test data
Property；
2, the present invention forms the air chamber in gap multiple only by arranging radial baffle and longitudinal baffle in gap
Vertical heat transfer region reduces convective heat transfer, and avoids stack effect, improves the being heated evenly property of test specimen, has ensured survey
The accuracy of test result.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of the specific embodiment of the invention；
Fig. 2 is the schematic cross-section of the specific embodiment of the invention.
Label and corresponding parts title in attached drawing：
1- tubular test coupon, 2- heating tube, 3- radial direction baffle, 4- heater element, the end 5- thermal insulation board, 6- test piece end are anti-
Shield, 7- heat tube end protection, 8- longitudinal baffle.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
In the description of the present invention, it is to be understood that, term "front", "rear", "left", "right", "upper", "lower", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "high", " low " "inner", "outside" is orientation based on the figure or position
Relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have
There is specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the scope of the invention.
Embodiment：
A kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device as depicted in figs. 1 and 2, including heater element 4, institute
The both ends for stating heater element 4 are provided with end guard assembly, and the end guard assembly includes test piece end protection 6, heating
Tube end protection 7, the test piece end protection 6 are set in the outside of heating tube end protection 7, the thickness of test piece end protection 6
Less than the thickness of heating tube end protection 7,4 outer sheath of heater element is equipped with heating tube 2；It is described when carrying out Experimental Study of Heat Transfer
There are gaps between 1 inner wall of 2 outer wall of heating tube and tubular test coupon；Two pieces of radial baffles are arranged on 2 outer wall of heating tube
3, the gap between tubular test coupon 1 and heating tube 2 is divided into three sections along the axial direction of heating tube 2 by two pieces of radial baffles 3；Add
At least six pieces of longitudinal baffles 8 are additionally provided on 2 outer wall of heat pipe, six pieces of longitudinal baffles 8 are connect with radial baffle 3, described vertical
The gap between tubular test coupon 1 and heating tube 2 is divided into six pieces of independent heat transfers along the circumferential direction of heating tube 2 to baffle 8
Region, and six pieces of longitudinal baffles 8 are uniformly distributed along the circumferential direction of heating tube 2；End is provided in the heating tube end protection 7
Portion's thermal insulation board 5；The material of the radial direction baffle 3, longitudinal baffle 8 and end thermal insulation board 5 is micarex.
In use, one piece of end guard assembly is placed on experimental bench, two pieces of radial baffles 3 are installed in heating tube 2,
And the circumferential direction on two pieces of radial baffles 3 along heating tube 2 is clamped six pieces of longitudinal baffles 8 in total, in some embodiments, diameter
It is also possible to integral structure to baffle 3 and longitudinal baffle 8；Tubular test coupon 1 is mounted on to the test specimen end of end guard assembly later
In portion's protection 6, the inner wall at 1 both ends of tubular test coupon is connect with heating tube end protection 7；Another piece of end guard assembly is pacified later
On the end face of tubular test coupon 1, at this point, 3 side of radial baffle is contacted with the inner wall of tubular test coupon 1, the both ends of heating tube 2 are logical
End thermal insulation board 5 is crossed to be fixed between two pieces of heating tube ends protection 7, tubular test coupon 1 be fixed on two pieces of test piece ends protection 6 it
Between；Heater element 4 is opened later starts Experimental Study of Heat Transfer.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device, including heater element (4), the heater element (4)
Both ends are provided with end guard assembly, which is characterized in that heater element (4) outer sheath is equipped with heating tube (2)；
When carrying out Experimental Study of Heat Transfer, there are gaps between heating tube (2) outer wall and tubular test coupon (1) inner wall.
2. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device according to claim 1, which is characterized in that described
It is arranged with radial baffle (3) on heating tube (2) outer wall, the radial direction baffle (3) will be between tubular test coupon (1) and heating tube (2)
Gap be divided into multiple independent heat transfer regions in the axial direction.
3. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device according to claim 2, which is characterized in that described
The quantity of radial baffle (3) is two pieces.
4. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device according to claim 1, which is characterized in that described
Be additionally provided with longitudinal baffle (8) on heating tube (2) outer wall, the longitudinal baffle (8) by tubular test coupon (1) and heating tube (2) it
Between gap be divided into multiple independent heat transfer regions in the circumferential.
5. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device according to claim 4, which is characterized in that described
The quantity of longitudinal baffle (8) is six pieces, and six pieces of longitudinal baffles (8) are uniformly distributed along the circumferential direction of heating tube (2).
6. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device according to any one of claims 1 to 5, special
Sign is that the end guard assembly includes test piece end protection (6), heating tube end protection (7), the test piece end protection
(6) it is set in the outside of heating tube end protection (7), test piece end protects the thickness of (6) to be less than heating tube end protection (7)
Thickness.
7. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device according to claim 6, which is characterized in that described
End thermal insulation board (5) are provided in heating tube end protection (7).
8. a kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device according to any one of claims 1 to 5, special
Sign is, the radial direction baffle (3), longitudinal baffle (8) material be micarex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841314.2A CN108896603A (en) | 2018-07-27 | 2018-07-27 | A kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841314.2A CN108896603A (en) | 2018-07-27 | 2018-07-27 | A kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108896603A true CN108896603A (en) | 2018-11-27 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810841314.2A Pending CN108896603A (en) | 2018-07-27 | 2018-07-27 | A kind of metallic insulation tubular test coupon Experimental Study of Heat Transfer device |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782212A (en) * | 2020-12-29 | 2021-05-11 | 安徽应流集团霍山铸造有限公司 | Nuclear power metal heat preservation heat transfer performance test device |
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Application publication date: 20181127 |