CN209876180U - Pipeline structure for preventing cold-heat exchange mixed heat fatigue - Google Patents
Pipeline structure for preventing cold-heat exchange mixed heat fatigue Download PDFInfo
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- CN209876180U CN209876180U CN201920240799.XU CN201920240799U CN209876180U CN 209876180 U CN209876180 U CN 209876180U CN 201920240799 U CN201920240799 U CN 201920240799U CN 209876180 U CN209876180 U CN 209876180U
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Abstract
The utility model provides a prevent cold and hot tired pipeline structure of muddy heat, including being responsible for and the branch pipe that is used for the fluid circulation, the exit end of branch pipe sets up be responsible for in and be connected with the honeycomb duct, the honeycomb duct with be provided with the circulation clearance between being responsible for, just the fluidic flow direction in the honeycomb duct with it is the same to be responsible for fluidic flow direction. The utility model provides a pipeline structure can guarantee when cold and hot fluid joins, and the honeycomb duct fluid is in among the fluidic surrounding of being responsible for, and cold and hot fluidic interface is in inside the pipeline and not contacts with the pipeline wall to solved cold and hot handing over and mixed produced pipeline thermal fatigue problem, structural design is simple and practical, has good practicality and economic nature.
Description
Technical Field
The utility model relates to the technical field of pipelines, concretely relates to cold-proof heat exchange mixes tired pipeline structure of heat.
Background
In a fluid process system of a nuclear power plant, a large amount of cold and hot fluid is merged and mixed. The traditional three-way pipe structure is shown in figure 1, branch pipe fluid and main pipe fluid with temperature difference are converged at a tee joint, and a cold-heat mixing phenomenon is generated at the downstream of the tee joint, so that the phenomenon that cold and heat frequently alternate exists on the wall surface of a pipeline in a cold-heat mixing area, and therefore thermal fatigue of pipeline materials is caused, and the pipeline is cracked or even broken due to long-term thermal fatigue, so that the safety of a power plant is influenced.
A solution to the problem of cold-heat-exchange mixed-heat fatigue in the prior art is to add a thermal fatigue monitoring instrument at a position where cold-heat-exchange mixed is likely to occur, so as to monitor the thermal fatigue phenomenon of a pipeline. However, the thermal fatigue monitoring scheme does not solve the thermal fatigue problem, but only judges failure possibly caused by thermal fatigue in advance through long-term monitoring so as to intervene in replacing the pipeline in advance, does not solve the problem, and can only avoid the occurrence of breakage; the other solution is to adopt a specially forged pipeline at a position with more serious cold and hot mixing, so as to improve the thermal fatigue resistance of the pipeline, thereby avoiding the failure of the pipeline due to the thermal fatigue problem. However, the problem of thermal fatigue caused by cold-heat mixing is not solved by the mode of improving the thermal fatigue resistance performance through the special forging, the equipment can bear more times of cold-heat alternating transient states only by improving the performance of the equipment, and the cost of the specially forged three-way pipeline is much higher than that of a common pipeline.
Therefore, manufacturing a pipeline structure capable of preventing cold-heat mixing and thermal fatigue is an urgent problem to be solved in the nuclear power plant at present.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem among the above-mentioned prior art, provide a prevent cold and hot heat exchange and mix tired pipeline structure of heat, can make cold and hot interface that cold and hot heat exchange mixes remain throughout inside the pipeline and do not avoid contacting with the pipeline to fundamentally solves the hot tired problem of pipeline.
The utility model is used for solve above technical problem's technical scheme and do: provided is a cold-heat-mixing fatigue-preventing pipe structure, including:
a main pipe for fluid communication;
the outlet end of the branch pipe is arranged in the main pipe and is connected with a flow guide pipe, a circulation gap is arranged between the flow guide pipe and the main pipe, and the flow direction of the fluid in the flow guide pipe is the same as that of the fluid in the main pipe.
In the above pipeline structure of the present invention, the main pipe is provided with an expanding section, and the cross-sectional area of the expanding section is larger than that of the main pipe; the honeycomb duct is arranged in the diameter expanding section.
In the above pipe structure of the present invention, the flow guide pipe extends along the length direction of the main pipe; the central lines of the main pipe, the diameter expanding section and the flow guide pipe are positioned on the same straight line.
In the above pipe structure of the present invention, the flow guiding pipe comprises an elbow and a straight pipe, one end of the elbow is connected to the outlet end of the branch pipe, and the other end of the elbow is connected to the straight pipe; one end of the straight pipeline, which is far away from the elbow, is a free end.
The utility model discloses among the foretell pipeline structure, honeycomb duct and branch pipe integrated into one piece.
The utility model discloses among the foretell pipeline structure, the connecting hole has been seted up on the lateral wall of being responsible for wear to establish branch pipe and honeycomb duct.
In the above pipe structure of the present invention, the length of the diameter-expanding section is 5 to 30 times of the diameter-expanding section.
The technical scheme provided by the embodiment can have the following beneficial effects:
(1) the flow guide pipe is arranged in the main pipe, so that when cold and hot fluids are converged, the flow of the flow guide pipe is surrounded by the fluid of the main pipe, and the interface of the cold and hot fluids is positioned in the pipeline and is not contacted with the wall surface of the pipeline, so that the problem of pipeline thermal fatigue caused by cold and hot mixing is solved;
(2) the flow guide pipe is arranged in the main pipe, and the fluid in the flow guide pipe and the fluid in the main pipe exchange heat in the flow guide pipe section, so that the temperature difference when cold and hot fluids are mixed can be further reduced, and the interface generated when the cold and hot fluids are converged is shortened;
(3) the main pipe where the flow guide pipe is located is expanded to form an expanding section, so that the flow area of the fluid is increased, the local flow resistance is reduced, the flow velocity of the fluid can be reduced, the disturbance effect is reduced, and the problem of pipeline thermal fatigue caused by cold-heat mixing is further reduced;
(4) the pipeline structure is formed by assembling a main pipe, a branch pipe and a flow guide pipe, is simple to process and low in cost, and greatly reduces the processing difficulty and the processing cost compared with a specially forged pipeline.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic structural diagram of a three-way pipe cold and hot fluid junction in the prior art;
fig. 2 is a schematic plan view of a pipeline structure provided by an embodiment of the present invention.
Detailed Description
In order to make the present invention more clearly understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2, fig. 2 is a schematic plan view of a pipeline structure shown in this embodiment, the pipeline structure includes a main pipe 10 and a branch pipe 20 for fluid circulation, an outlet end of the branch pipe 20 is disposed in the main pipe 10 and connected to a flow guide pipe 30, a flow gap is disposed between the flow guide pipe 30 and the main pipe 10, and a flow direction of fluid in the flow guide pipe 30 is the same as a flow direction of fluid in the main pipe 10, so that a cold-hot interface generated by mixing of hot fluid in the main pipe 10 and the branch pipe 20 is maintained inside the main pipe 10 and is not in contact with a pipe wall surface of the main pipe 10, thereby solving a thermal fatigue problem of.
Furthermore, the main pipe 10 is provided with an expanding section 11 through expanding, the cross section area of the expanding section 11 is larger than that of the straight section of the main pipe 10, and the guide pipe 30 is arranged in the expanding section 11, so that the cross section area of the main pipe 10 at the position of the guide pipe 30 is increased, and the flow resistance in a pipeline is reduced, thereby avoiding the problems that the flow area in the main pipe is reduced and the flow resistance is increased after the guide pipe 30 extends into the main pipe 10; on the other hand, the diameter expanding section 11 can reduce the flow velocity of the fluid, so that the disturbance effect of fluid mixing is reduced, and the problem of pipeline thermal fatigue caused by cold-heat mixing is further reduced.
In this embodiment, the draft tube 30 is extended along the longitudinal direction of the main tube 10, the center lines of the main tube 10, the diameter-expanding section 11 and the draft tube 30 are positioned on the same straight line, and the branch tube 20 is perpendicular to the main tube 10.
Specifically, the flow gap between the draft tube 30 and the diameter-expanding section 11 is 0.1-0.4 times the diameter of the main tube 10, the length of the diameter-expanding section 11 is 5-30 times the diameter of the main tube, and when the flow gap is small, the length of the diameter-expanding section 11 can be properly increased; when the flow gap is larger, the length of the expanding section 11 can be properly reduced to ensure that the interface of cold and hot fluid is positioned in the pipeline.
Further, the draft tube 30 comprises an elbow 31 and a straight pipeline 32, one end of the elbow 31 is welded to the outlet end of the branch pipe 20, and the other end of the elbow 31 is welded to the straight pipeline 32; one end of the straight pipeline 32 far away from the elbow 31 is a free end; the elbow 31 is a commonly used connecting pipe fitting, is used for connecting the corners of pipelines, and can be used for connecting two pipelines with different or same nominal diameters. In other embodiments of the present invention, the flow guiding tube 30 and the branch tube 20 are integrally formed, that is, the flow guiding tube 30 is formed by bending the outlet end of the branch tube 20, and the structure is simpler.
In the actual use process, the guide pipe 30 and the branch pipe 20 can be assembled in advance, the main pipe 10 is provided with a connecting hole for penetrating the branch pipe 20, the guide pipe 30 can be installed in the main pipe 10 through the connecting hole, and the whole processing process is very simple. In order to assemble the pipeline structure, the pipeline structure further includes flanges respectively disposed at both ends of the main pipe 10 in the length direction, and flanges disposed at inlet ends of the branch pipes 20, so that the pipeline structure is conveniently connected to a fluid process system of a nuclear power plant.
It should be noted that the main pipe 10 may be used for conducting cold fluid, and may also be used for conducting hot fluid, and the branch pipe 20 may also be used for conducting cold or hot fluid, and the embodiment is not limited in particular.
To sum up, the utility model provides an anti cold and hot heat exchange mixes tired pipeline structure has following beneficial effect:
the pipeline structure is provided with the guide pipe in the main pipe, so that when cold and hot fluids are converged, the fluid of the guide pipe is surrounded by the fluid of the main pipe, and the interface of the cold and hot fluids is positioned in the pipeline and is not contacted with the wall surface of the pipeline, so that the problem of pipeline thermal fatigue caused by cold and hot mixing is solved; meanwhile, the fluid in the guide pipe and the fluid in the main pipe can exchange heat in the guide pipe section, so that the temperature difference when cold and hot fluids are mixed can be further reduced, and the interface generated when the cold and hot fluids are mixed is shortened; on the other hand, the pipeline structure is assembled by being responsible for, branch pipe and honeycomb duct and forms, and processing is simple, and is with low costs, compares special forged pipeline, greatly reduced the processing degree of difficulty and processing cost, has good practicality and economic nature.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (7)
1. The utility model provides a prevent tired pipeline structure of cold and heat exchange mixture heat which characterized in that includes:
a main pipe (10) for the passage of a fluid;
the flow direction of the fluid in the flow guide pipe (30) is the same as that of the fluid in the main pipe (10).
2. A pipe structure according to claim 1, characterized in that said main pipe (10) is provided with an expanded diameter section (11) with an expanded cross-sectional area (11) larger than the cross-sectional area of said main pipe (10); the guide pipe (30) is arranged in the diameter expanding section (11).
3. The piping structure according to claim 2, wherein the draft tube (30) is provided extending in the length direction of the main pipe (10); the central lines of the main pipe (10), the diameter expanding section (11) and the draft tube (30) are positioned on the same straight line.
4. A piping structure according to claim 1, characterized in that said flow guide pipe (30) comprises an elbow (31) and a straight pipe (32), one end of said elbow (31) being connected to the outlet end of said branch pipe (20), the other end of said elbow (31) being connected to said straight pipe (32).
5. The piping structure according to claim 1, wherein the draft tube (30) is integrally formed with the branch tube (20).
6. The piping structure according to claim 2, wherein the side wall of said expanded diameter section (11) is provided with connection holes for passing through said branch pipes (20) and said draft tubes (30).
7. A pipe structure according to claim 2, characterized in that the length of the expanded diameter section (11) is 5-30 times the diameter of the expanded diameter section (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920240799.XU CN209876180U (en) | 2019-02-26 | 2019-02-26 | Pipeline structure for preventing cold-heat exchange mixed heat fatigue |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920240799.XU CN209876180U (en) | 2019-02-26 | 2019-02-26 | Pipeline structure for preventing cold-heat exchange mixed heat fatigue |
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| Publication Number | Publication Date |
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| CN209876180U true CN209876180U (en) | 2019-12-31 |
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| CN201920240799.XU Active CN209876180U (en) | 2019-02-26 | 2019-02-26 | Pipeline structure for preventing cold-heat exchange mixed heat fatigue |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377711A (en) * | 2020-11-30 | 2021-02-19 | 亚洲硅业(青海)股份有限公司 | Pipeline protection device |
-
2019
- 2019-02-26 CN CN201920240799.XU patent/CN209876180U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377711A (en) * | 2020-11-30 | 2021-02-19 | 亚洲硅业(青海)股份有限公司 | Pipeline protection device |
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