Two-phase water hammer relieving device and industrial production / two-phase pipeline transportation system

Abstract

The invention belongs to the technical field of reactor thermal hydraulic power and safety, and particularly provides a two-phase water hammer relieving device and an industrial production / two-phase pipeline transportation system. The invention aims to solve the problem that an existing water hammer relieving device is easy to cause increase of resistance in a pipeline. A two-phase water hammer relieving device comprises a flow guide pipe, an annular screen mesh and a supporting arm, and the annular screen mesh is arranged in the flow guide pipe; the two ends of the supporting arm are connected with the inner wall of the flow guide pipe and the outer wall of the annular silk screen correspondingly, so that a main flow channel is formed in the inner side of the annular silk screen, and a flow dividing channel is formed between the annular silk screen and the flow guide pipe. The water hammer phenomenon in the pipeline can be effectively relieved, meanwhile, resistance cannot be generated on fluid in the pipeline, the structure is simple, and implementation is easy.

Description

Technical Field

[0001] The invention belongs to the field of reactor thermal hydraulics and safety technology, and specifically provides a two-phase water hammer relief device and an industrial production / two-phase pipeline transportation system. Background Art

[0002] Two-phase flow often occurs in scientific research experimental devices and industrial production equipment. In the two-phase flow in the horizontal pipe, steam usually gathers at the upper part of the pipe. When the steam gathered at the upper part of the pipe condenses rapidly, it will cause water hammer phenomenon, resulting in strong vibration and noise, which seriously threatens the safe operation of the equipment.

[0003] Existing water hammer elimination / mitigation devices mainly use forced circulation flow, that is, adding fairings, guide bodies and other components in the pipeline to alleviate the water hammer phenomenon, but this can easily increase the flow resistance of the pipeline, making it difficult to use in a natural circulation loop.

[0004] Therefore, a two-phase water hammer relief device is provided to solve the above problems. Summary of the invention

[0005] An object of the present invention is to provide a two-phase water hammer mitigation device that can alleviate the water hammer phenomenon without increasing the resistance of the pipeline.

[0006] To achieve the above object, the present invention provides a two-phase water hammer mitigation device, comprising:

[0007] A flow guide pipe and an annular wire mesh arranged in the flow guide pipe;

[0008] A support arm, wherein both ends of the support arm are respectively connected to the inner wall of the guide tube and the outer wall of the annular screen, so that a main flow channel is formed inside the annular screen, and a branch flow channel is formed between the annular screen and the guide tube.

[0009] Furthermore, the guide pipe includes a straight pipe section and a bent pipe section, the bent pipe section is provided at one end of the straight pipe section, and the bent pipe section is bent inward along the inner wall of the straight pipe section; the annular wire mesh and the bent pipe section are placed along the same axis.

[0010] Furthermore, the annular wire mesh is configured as a plurality of annular wire meshes, and the plurality of annular wire meshes are placed in the guide tube along the same axis.

[0011] Furthermore, the interval between two adjacent annular screens is set to 5 mm to 10 mm.

[0012] Furthermore, the length of each of the annular wire meshes is set to 50 mm.

[0013] Furthermore, the total length of the flow guide pipe is set to 500 mm.

[0014] Furthermore, the two-phase water hammer relief device also includes a diverter pipe, which is located between the guide pipe and the plurality of annular wire meshes to divide the diverter channel into two sub-channels; the support arm includes a first support arm and a second support arm, the first support arm is arranged between the diverter pipe and the guide pipe; the second support arm is arranged between the diverter pipe and each of the annular wire meshes.

[0015] Furthermore, the support arm is provided with a plurality of through holes, and the plurality of through holes allow two-phase media to pass through.

[0016] Furthermore, an industrial production / two-phase pipeline transportation system is characterized by comprising a pipeline for conveying a two-phase medium and a two-phase water hammer relief device as described in any one of the above, wherein the two-phase water hammer relief device is arranged in the pipeline.

[0017] Furthermore, the two-phase water hammer relief device is installed in the pipeline by welding.

[0018] Based on the foregoing description, those skilled in the art will understand that, in the aforementioned technical solution of the present invention, by adding an annular wire mesh in the guide tube and providing a support arm between the guide tube and the annular wire mesh, a main channel is formed on the inner side of the annular wire mesh, and a diversion channel is formed between the annular wire mesh and the guide tube. When a large steam bomb enters the main channel, due to the capillary action of the wire mesh, the steam bomb cannot contact the upper wall of the pipeline through the wire mesh and can only gather in the upper part of the main channel. When the steam mass passes through the wire mesh interval, part of the steam will pass through the wire mesh interval and enter the diversion channel to form small bubbles, thereby decomposing the large steam bomb into small bubbles, thereby alleviating the water hammer phenomenon occurring in the two-phase medium pipeline. The present invention innovatively uses wire mesh to alleviate the water hammer phenomenon in the two-phase medium pipeline, has a simple structure, and is relatively easy to implement.

[0019] Furthermore, by adding a diverter pipe and locating the diverter pipe between the guide pipe and the plurality of annular screens, the diverter channel is divided into two sub-channels, so that the small bubbles entering the diverter channel are diverted and guided into the sub-channels to form a natural circulation, so that the water with lower temperature in the mainstream channel can flow into the sub-channel, and the small bubbles separated from the mainstream channel into the sub-channel are cooled, so that they are condensed in advance in this area, thereby weakening the water hammer phenomenon caused by the rapid condensation of steam, and further improving the mitigation effect of the two-phase water hammer mitigation device on the water hammer phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the same reference numerals indicate the same or similar components or parts in different drawings; the drawings of the present invention are not necessarily drawn to scale.

[0021] In the attached figure:

[0022] Figure 1 Schematic diagram of the structure of a two-phase water hammer mitigation device in some embodiments of the present invention.

[0023] Description of reference numerals:

[0024] 100. Two-phase water hammer relief device;

[0025] 1. guide pipe; 11. straight pipe section; 12. bent pipe section; 2. annular wire mesh; 3. diverter pipe; 41. first support arm; 42. second support arm; 5. main flow channel; 6. sub-flow channel. DETAILED DESCRIPTION

[0026] It should be understood by those skilled in the art that the embodiments described below are only some embodiments of the present invention, rather than all embodiments of the present invention, and these embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

[0027] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Refer to the following Figure 1 , to describe in detail the two-phase water hammer mitigation device in some embodiments of the present invention. Figure 1 Schematic diagram of the structure of a two-phase water hammer mitigation device in some embodiments of the present invention.

[0030] It should be noted that, for the convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, the following text only describes the technical features that are strongly related (directly or indirectly related) to the technical problem and / or technical concept to be solved by the present invention, and will not describe the technical features that are weakly related to the technical problem and / or technical concept to be solved by the invention. Since the technical features with a weaker degree of correlation belong to the common knowledge in the field, even if the present invention does not describe the features with a weaker degree of correlation, it will not lead to insufficient disclosure of the present invention.

[0031] like Figure 1 As shown, in some embodiments of the present invention, a two-phase water hammer mitigation device 100 is provided, comprising a flow guide pipe 1, an annular wire mesh 2 and a support arm, wherein the annular wire mesh 2 is arranged in the flow guide pipe 1. The two ends of the support arm are respectively connected to the inner wall of the flow guide pipe 1 and the outer wall of the annular wire mesh 2, so that a mainstream channel 5 is formed inside the annular wire mesh 2, and a diversion channel is formed between the annular wire mesh 2 and the flow guide pipe 1. When a large steam bomb enters the mainstream channel 5, due to the capillary action of the wire mesh, the steam bomb cannot contact the upper wall of the pipeline through the wire mesh, and can only gather in the upper part of the mainstream channel 5. When the steam mass passes through the annular wire mesh 2, part of the steam will enter the diversion channel through the annular wire mesh 2 to form small bubbles, thereby decomposing the large steam bomb into small bubbles, thereby alleviating the water hammer phenomenon in the two-phase medium pipeline.

[0032] The flow guide pipe 1 includes a straight pipe section 11 and a bent pipe section 12 . The bent pipe section 12 is disposed at one end of the straight pipe section 11 . The bent pipe section 12 is bent inward along the inner wall of the straight pipe section 11 .

[0033] The annular wire mesh 2 and the bent pipe section 12 are placed along the same axis.

[0034] The diameter of the annular screen 2 can be set to be equal to the diameter of the bent pipe section 12 of the guide pipe 1. The "equal" mentioned here can mean equal in an absolute sense / numerical sense, or approximately equal / numerical sense.

[0035] The annular wire meshes 2 are configured in plurality, and the plurality of annular wire meshes 2 are placed in the flow guide tube 1 along the same axis.

[0036] Those skilled in the art can select the interval between multiple annular screens 2, the length of the annular screens 2 and the length of the guide tube 1 as needed. In this embodiment, preferably, the interval between two adjacent annular screens 2 is set to 5mm to 10mm, the length of each annular screen 2 is set to 50mm, and the total length of the guide tube 1 is set to 500mm.

[0037] The support arm can be arranged at multiple positions between the guide pipe 1 and the annular screen 2 to improve the structural stability of the two-phase water hammer mitigation device 100. Preferably, in this embodiment, the support arm is arranged between the lowest point of the inner wall of the guide pipe 1 and the lowest point of the outer wall of the annular screen 2.

[0038] The support arm can be connected to the inner wall of the flow guide pipe 1 and the outer wall of the annular wire mesh 2 by welding.

[0039] In still other embodiments of the present invention, a plurality of through holes are provided on the support arm, and the plurality of through holes allow the two-phase medium to pass through.

[0040] In some other embodiments of the present invention, the two-phase water hammer relief device 100 also includes a diverter pipe 3, which is located between the guide pipe 1 and the multiple annular screens 2, dividing the diverter channel into two sub-channels 6, and diverting the small bubbles entering the diverter channel to the sub-channels 6 to form a natural circulation, so that the water with lower temperature in the mainstream channel 5 can flow into the sub-channel 6, and the small bubbles separated from the mainstream channel 5 to the sub-channel 6 are cooled, so that they are condensed in advance in this area, thereby weakening the water hammer phenomenon caused by the rapid condensation of steam, and effectively improving the mitigation effect of the two-phase water hammer relief device 100 on the water hammer phenomenon.

[0041] The support arm includes a first support arm 41 and a second support arm 42. The first support arm 41 is arranged between the shunt pipe 3 and the guide pipe 1, and the first support arm 41 is used to support the shunt pipe 3. The second support arm 42 is arranged between the shunt pipe 3 and each annular screen 2, and the second support arm 42 is used to support the annular screen 2. The first support arm 41 and the second support arm 42 can be arranged at multiple positions on the inner / outer wall of the shunt pipe 3 to improve the stability of the structure of the two-phase water hammer relief device 100.

[0042] The first support arm 41 and the second support arm 42 are connected to the flow guide pipe 1 , the annular wire mesh 2 , and the diverter pipe 3 by welding.

[0043] In other embodiments of the present invention, a plurality of through holes are disposed on the first support 41 and the second support arm 42, and the plurality of through holes allow the two-phase medium to pass through.

[0044] In other embodiments of the present invention, an industrial production / two-phase pipeline transportation system is provided, comprising a pipeline for conveying a two-phase medium and any one of the above two-phase water hammer mitigation devices 100, wherein the two-phase water hammer mitigation device 100 is disposed in the pipeline.

[0045] The two-phase water hammer relief device 100 is installed in the pipeline by welding.

[0046] It should be noted that when assembling the two-phase medium pipeline, the pipeline can be arranged to be installed in an upward tilted shape from upstream to downstream as a whole, and then the two-phase water hammer mitigation device 100 is installed, and the bending section of the guide pipe 1 can be arranged upstream of the pipeline, so that the two-phase water hammer mitigation device 100 is tilted as a whole, so as to improve the mitigation effect of the two-phase water hammer mitigation device 100. Alternatively, the two-phase medium pipeline does not need to be installed tilted, and only the two-phase water hammer mitigation device 100 can be installed tilted in the pipeline.

[0047] It should be further explained that those skilled in the art can select the materials of the guide pipe 1, the diversion pipe 3, the annular screen 2 and the support arm and the shape of the surface of the annular screen 2 according to the needs of the actual pipeline system. The present invention does not limit them and will not be elaborated on them.

[0048] Those skilled in the art can understand that, the present invention forms a main channel on the inner side of the annular wire mesh 2 and a diversion channel between the annular wire mesh 2 and the guide tube 1 by adding an annular wire mesh 2 in the guide tube 1 and supporting an arm 4 between the guide tube 1 and the annular wire mesh 2. When a large steam bomb enters the main channel 5, due to the capillary action of the wire mesh, the steam bomb cannot contact the upper wall of the pipeline through the wire mesh and can only gather in the upper part of the main channel 5. When the steam mass passes through the wire mesh interval, part of the steam will pass through the wire mesh interval and enter the diversion channel to form small bubbles, thereby decomposing the large steam bomb into small bubbles, so as to alleviate the water hammer phenomenon occurring in the two-phase medium pipeline. The present invention effectively alleviates the water hammer phenomenon occurring in the two-phase medium pipeline, has a simple structure, and is relatively easy to implement.

[0049] Furthermore, by adding a diverter pipe 3 and locating the diverter pipe 3 between the guide pipe 1 and the plurality of annular screens 2, the diverter channel is divided into two sub-channels 6, so that the small bubbles entering the diverter channel are diverted and guided into the sub-channels 6 to form a natural circulation, so that the water with lower temperature in the mainstream channel 5 can flow into the sub-channel 6, and the small bubbles separated from the mainstream channel 5 into the sub-channel 6 are cooled, so that they are condensed in advance in this area, thereby weakening the water hammer phenomenon caused by the rapid condensation of steam, and further improving the mitigation effect of the two-phase water hammer mitigation device 100 on the water hammer phenomenon.

[0050] So far, the technical solution of the present invention has been described in combination with the above multiple embodiments, but it is easy for those skilled in the art to understand that the protection scope of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present invention will fall within the protection scope of the present invention.

Claims

1. A two-phase water hammer mitigation device, characterized in that: include: A flow guide pipe and an annular wire mesh arranged in the flow guide pipe; A support arm, wherein both ends of the support arm are respectively connected to the inner wall of the guide tube and the outer wall of the annular screen, so that a main flow channel is formed inside the annular screen, and a branch flow channel is formed between the annular screen and the guide tube.

2. The two-phase water hammer mitigation device according to claim 1, characterized in that: The flow guide pipe comprises a straight pipe section and a bent pipe section, wherein the bent pipe section is disposed at one end of the straight pipe section, and the bent pipe section is bent inwardly along the inner wall of the straight pipe section; and The annular wire mesh and the bent pipe section are placed along the same axis.

3. The two-phase water hammer mitigation device according to claim 2, characterized in that: The two-phase water hammer mitigation device further includes a flow diversion pipe, which is located between the flow guide pipe and the plurality of annular wire meshes to divide the flow diversion channel into two sub-flow channels; and The support arm includes a first support arm and a second support arm, wherein the first support arm is arranged between the shunt pipe and the guide pipe; and the second support arm is arranged between the shunt pipe and each of the annular wire meshes.

4. The two-phase water hammer mitigation device according to claim 3, characterized in that: The first support arm and the second support arm are both provided with a plurality of through holes, and the plurality of through holes allow two-phase media to pass through.

5. The two-phase water hammer mitigation device according to claim 2, characterized in that: The annular screens are configured in plurality, and the plurality of annular screens are placed in the flow guide tube along the same axis.

6. The two-phase water hammer mitigation device according to claim 3, characterized in that: The interval between two adjacent annular screens is set to 5 mm to 10 mm.

7. The two-phase water hammer mitigation device according to claim 3, characterized in that: The length of each of the annular screens is set to 50 mm.

8. The two-phase water hammer mitigation device according to claim 1, characterized in that: The total length of the flow guide pipe is set to 500 mm.

9. An industrial production / two-phase pipeline transportation system, characterized in that: The invention comprises a pipeline for conveying a two-phase medium and the two-phase water hammer relief device according to any one of claims 1 to 8, wherein the two-phase water hammer relief device is arranged in the pipeline.

10. The two-phase water hammer mitigation device according to claim 9, characterized in that: The two-phase water hammer mitigation device is installed in the pipeline by welding.

Images