Two-phase water hammer mitigation device and two-phase pipeline transportation system for industrial production

Abstract

This invention belongs to the field of reactor thermal hydraulics and safety technology, specifically providing a two-phase water hammer mitigation device and an industrial two-phase pipeline transport system. The invention aims to solve the problem that existing water hammer mitigation devices easily lead to increased resistance within the pipeline. A two-phase water hammer mitigation device includes a guide pipe, an annular wire mesh, and a support arm. The annular wire mesh is disposed inside the guide pipe; the two ends of the support arm are respectively connected to the inner wall of the guide pipe and the outer wall of the annular wire mesh, so that a main flow 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 pipe. This invention can effectively mitigate water hammer phenomena in pipelines without generating resistance to the fluid within the pipeline. It has a simple structure and is relatively easy to implement.

Description

Technical Field

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

[0002] Two-phase flow often occurs in scientific research experimental devices and industrial production equipment. In two-phase flow in horizontal pipes, steam usually accumulates at the top of the pipe. When the steam accumulated at the top of the pipe condenses rapidly, it will cause water hammer, which will generate strong vibration and noise, seriously threatening the safe operation of the equipment.

[0003] Existing water hammer elimination / mitigation devices mainly employ forced circulation flow, which involves adding components such as rectifiers and guides inside the pipe to mitigate the water hammer phenomenon. However, this also easily increases the flow resistance of the pipe, making it difficult to use in natural circulation loops.

[0004] Therefore, a two-phase water hammer mitigation device is provided to solve the above-mentioned problem. Summary of the Invention

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

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

[0007] A guide tube and an annular wire mesh disposed within the guide tube;

[0008] A support arm is provided, with its two ends connected to the inner wall of the guide tube and the outer wall of the annular wire mesh, respectively, so that a main flow 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.

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

[0010] Furthermore, multiple annular wire meshes are configured, and the multiple annular wire meshes are placed inside the guide tube with the same axis.

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

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

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

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

[0015] Furthermore, the support arm is provided with multiple through holes, which allow two-phase media to pass through.

[0016] Furthermore, an industrial production two-phase pipeline transportation system includes a pipeline for transporting two-phase media and a two-phase water hammer mitigation device as described above, wherein the two-phase water hammer mitigation device is disposed within the pipeline.

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

[0018] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this invention, by adding an annular wire mesh inside the guide pipe and a support arm between the guide pipe and the annular wire mesh, a main flow 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 pipe. When the large steam bomb enters the main flow channel, due to the capillary action of the wire mesh, the steam bomb cannot contact the upper wall of the pipe through the wire mesh and can only accumulate in the upper part of the main flow channel. When the steam ball passes through the wire mesh gap, some steam will enter the diversion channel through the wire mesh gap 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. This invention innovatively uses wire mesh to alleviate the water hammer phenomenon in the two-phase medium pipeline, with a simple structure and easy implementation.

[0019] Furthermore, by adding a diversion pipe and positioning it between the guide pipe and multiple annular wire meshes, the diversion channel is divided into two sub-channels. This diverts and guides the small bubbles entering the diversion channel into the sub-channels to form a natural circulation. This allows the cooler water in the main channel to flow into the sub-channels, cooling the small bubbles separated from the main channel and causing them to condense prematurely in that area. This weakens the water hammer phenomenon caused by rapid steam condensation and further improves the mitigation effect of the two-phase water hammer mitigation device. Attached Figure Description

[0020] 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. Those skilled in the art should understand that the same reference numerals may indicate the same or similar parts or components in different drawings; the drawings of the present invention are not necessarily drawn to scale. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a two-phase water hammer mitigation device in some embodiments of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100. Two-phase water hammer mitigation device;

[0024] 1. Guide pipe; 11. Straight pipe section; 12. Bent pipe section; 2. Annular wire mesh; 3. Diversion pipe; 41. First support arm; 42. Second support arm; 5. Main flow channel; 6. Sub-flow channel. Detailed Implementation

[0025] Those skilled in the art should understand that the embodiments described below are merely a part of the embodiments of the present invention, and not all of the embodiments of the present invention. These partial embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0026] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] The following reference Figure 1 This will be used to describe in detail the two-phase water hammer mitigation device in some embodiments of the present invention. Figure 1 This is a schematic diagram of the structure of a two-phase water hammer mitigation device in some embodiments of the present invention.

[0029] It should be noted beforehand that, for ease of description and to enable those skilled in the art to quickly understand the technical solution of this invention, the following description only focuses on technical features that are strongly related (directly or indirectly related) to the technical problem and / or concept to be solved by this invention. Technical features that are less related to the technical problem and / or concept to be solved by this invention will not be described in detail. Since such less related technical features are common knowledge in the field, the omission of such less related features will not result in insufficient disclosure of this invention.

[0030] like Figure 1 As shown, in some embodiments of the present invention, a two-phase water hammer mitigation device 100 is provided, including a guide pipe 1, an annular wire mesh 2, and a support arm. The annular wire mesh 2 is disposed inside the guide pipe 1. The two ends of the support arm are respectively connected to the inner wall of the guide pipe 1 and the outer wall of the annular wire mesh 2, so that a main flow channel 5 is formed on the inner side of the annular wire mesh 2, and a diversion channel is formed between the annular wire mesh 2 and the guide pipe 1. When a large steam bomb enters the main flow channel 5, due to the capillary action of the wire mesh, the steam bomb cannot contact the upper wall of the pipe through the wire mesh and can only accumulate in the upper part of the main flow channel 5. When the steam bomb passes through the annular wire mesh 2, some steam will enter the diversion channel through the annular wire mesh 2 at intervals to form small bubbles, thereby decomposing the large steam bomb into small bubbles, thus mitigating the water hammer phenomenon in the two-phase medium pipeline.

[0031] The guide pipe 1 includes a straight pipe section 11 and a bent pipe section 12. One end of the straight pipe section 11 is provided with a bent pipe section 12, which bends inward along the inner wall of the straight pipe section 11.

[0032] The annular wire mesh 2 and the bent pipe section 12 are placed along the same axis.

[0033] The diameter of the annular wire mesh 2 can be set to be equal to the diameter of the bent section 12 of the guide pipe 1. The term "equal" here can mean absolute or numerical equality, or approximately equal or close in value.

[0034] Multiple annular wire meshes 2 are configured, and the multiple annular wire meshes 2 are placed in the guide tube 1 with the same axis.

[0035] Those skilled in the art can select the spacing between multiple annular wire meshes 2, the length of the annular wire meshes 2, and the length of the guide tube 1 as needed. In this embodiment, preferably, the spacing between two adjacent annular wire meshes 2 is set to 5mm to 10mm, the length of each annular wire mesh 2 is set to 50mm, and the total length of the guide tube 1 is set to 500mm.

[0036] The support arm can be installed at multiple locations between the guide pipe 1 and the annular wire mesh 2 to improve the structural stability of the two-phase water hammer mitigation device 100. Preferably, in this embodiment, the support arm is positioned between the lowest point of the inner wall of the guide pipe 1 and the lowest point of the outer wall of the annular wire mesh 2.

[0037] The support arm can be connected to the inner wall of the guide tube 1 and the outer wall of the annular wire mesh 2 by welding.

[0038] In some other embodiments of the invention, the support arm is provided with a plurality of through holes, which allow two-phase media to pass through.

[0039] In some embodiments of the present invention, the two-phase water hammer mitigation device 100 further includes a diversion pipe 3, which is located between the guide pipe 1 and multiple annular wire meshes 2. The diversion pipe 3 divides the diversion channel into two sub-channels 6, diverting small bubbles entering the diversion channel to the sub-channels 6 to form a natural circulation. This allows the cooler water in the main channel 5 to flow into the sub-channels 6, cooling the small bubbles separated from the main channel 5 into the sub-channels 6 and causing them to condense in advance in this area. This weakens the water hammer phenomenon caused by rapid condensation of steam and effectively improves the mitigation effect of the two-phase water hammer mitigation device 100 on the water hammer phenomenon.

[0040] The support arms include a first support arm 41 and a second support arm 42. The first support arm 41 is disposed between the diversion pipe 3 and the guide pipe 1, and is used to support the diversion pipe 3. The second support arm 42 is disposed between the diversion pipe 3 and each annular wire mesh 2, and is used to support the annular wire mesh 2. The first support arm 41 and the second support arm 42 can be disposed at multiple locations on the inner / outer wall of the diversion pipe 3 to improve the structural stability of the two-phase water hammer mitigation device 100.

[0041] The first support arm 41 and the second support arm 42 are connected to the guide pipe 1, the annular wire mesh 2, and the diversion pipe 3 by welding.

[0042] In other embodiments of the present invention, both the first support 41 and the second support arm 42 are provided with multiple through holes, which allow two-phase media to pass through.

[0043] In other embodiments of the present invention, an industrial production two-phase pipeline transportation system is provided, including a pipeline for transporting two-phase media and a two-phase water hammer mitigation device 100 as described above, wherein the two-phase water hammer mitigation device 100 is disposed inside the pipeline.

[0044] The two-phase water hammer mitigation device 100 is installed inside the pipeline by welding.

[0045] It should be noted that when assembling a two-phase medium pipeline, the pipeline can be installed with an upward inclination from upstream to downstream. In this case, the two-phase water hammer mitigation device 100 can be installed with the bend in the guide pipe 1 positioned upstream, making the two-phase water hammer mitigation device 100 tilted overall, thus improving its mitigation effect. Alternatively, the two-phase medium pipeline does not need to be installed tilted; simply assembling the two-phase water hammer mitigation device 100 at an inclination within the pipeline is sufficient.

[0046] It should be further noted that those skilled in the art can select the materials of the guide pipe 1, the diversion pipe 3, the annular wire mesh 2 and the support arm, as well as the shape of the surface of the annular wire mesh 2, according to the needs of the actual pipeline system. This invention does not limit these selections and will not elaborate further.

[0047] Those skilled in the art will understand that the present invention, by adding an annular wire mesh 2 inside the guide pipe 1 and a support arm 4 between the guide pipe 1 and the annular wire mesh 2, 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 pipe 1. When the 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 pipe through the wire mesh and can only accumulate at the upper part of the main channel 5. When the steam ball passes through the wire mesh gap, some steam will enter the diversion channel through the wire mesh gap to form small bubbles, thereby decomposing the large steam bomb into small bubbles, thus alleviating the water hammer phenomenon in the two-phase medium pipeline. The present invention effectively alleviates the water hammer phenomenon in the two-phase medium pipeline, has a simple structure, and is relatively easy to implement.

[0048] Furthermore, by adding a diversion pipe 3 and positioning it between the guide pipe 1 and multiple annular wire meshes 2, the diversion channel is divided into two sub-channels 6. This diverts and guides the small bubbles entering the diversion channel into the sub-channels 6 to form a natural circulation. This allows the cooler water in the main channel 5 to flow into the sub-channels 6, cooling the small bubbles separated from the main channel 5 into the sub-channels 6 and causing them to condense in advance in this area. This weakens the water hammer phenomenon caused by the rapid condensation of steam and further improves the mitigation effect of the two-phase water hammer mitigation device 100 on the water hammer phenomenon.

[0049] The technical solutions of the present invention have been described in conjunction with several embodiments above. However, it will be readily understood by those skilled in the art that the scope of protection 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 disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to related technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of the present invention will fall within the scope of protection of the present invention.

Claims

1. A two-phase water hammer mitigation device, characterized in that, include: A guide tube and an annular wire mesh disposed within the guide tube; A support arm, the two ends of which are respectively connected to the inner wall of the guide tube and the outer wall of the annular wire mesh, so that a main flow 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; The guide pipe includes a straight pipe section and a bent pipe section, with the bent pipe section located at one end of the straight pipe section. The bent pipe section bends 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; The two-phase water hammer mitigation device further includes a diversion pipe located between the guide pipe and the plurality of annular wire meshes to divide the diversion channel into two sub-channels; and... The support arm includes a first support arm and a second support arm. The first support arm is disposed between the diversion pipe and the guide pipe. The second support arm is disposed between the diversion pipe and each of the annular wire meshes. Both the first support arm and the second support arm are provided with multiple through holes, which allow two-phase media to pass through; Multiple annular wire meshes are configured, and the multiple annular wire meshes are placed in the guide tube with the same axis, and a gap is provided between two adjacent annular wire meshes.

2. The two-phase water hammer mitigation device according to claim 1, characterized in that, The spacing between two adjacent annular wire meshes is set to 5 mm to 10 mm.

3. The two-phase water hammer mitigation device according to claim 1, characterized in that, The length of each of the aforementioned annular wire meshes is set to 50 mm.

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

5. An industrial production two-phase pipeline transportation system, characterized in that, It includes a pipeline for conveying a two-phase medium and a two-phase water hammer mitigation device according to any one of claims 1 to 4, wherein the two-phase water hammer mitigation device is disposed within the pipeline.

6. The industrial production two-phase pipeline transportation system according to claim 5, characterized in that, The two-phase water hammer mitigation device is installed inside the pipeline by welding.

Images