Steam transport pipe joints and steam transport pipe network systems

Abstract

The present invention relates to a steam conveying pipe section and a steam conveying pipe network system. The steam conveying pipe section includes a steam pipe and a water retaining edge. The water retaining edge is provided on the inner wall surface of the steam pipe. The first end of the water retaining edge is located at or adjacent to one side of the steam pipe in a preset direction. The second end of the water retaining edge is located in the range from the middle of the steam pipe in the preset direction to the other side. The water retaining edge has a guide groove, or the water retaining edge and the inner wall surface of the steam pipe are surrounded to form a guide groove. The guide groove is open on the side facing the flow direction of the fluid so that the water in the steam pipe flows from the first end to the second end along the guide groove. The steam conveying pipe section of the embodiment of the present invention can guide water to a high-temperature steam area, thereby utilizing superheated steam to vaporize water in the fluid, thereby being able to recover the working medium, reduce the amount of water drainage in the conveying pipe network, reduce or even eliminate the water drainage points in the steam conveying pipe network system, and then reduce the investment cost, reduce the maintenance workload of the steam conveying pipeline, and reduce the maintenance cost.

Description

Technical Field

[0001] The invention relates to the technical field of steam pipe network transportation, and in particular to a steam transportation pipe joint and a steam transportation pipe network system. Background Art

[0002] In the steam transmission network system of thermal power plants, for long-distance superheated steam transmission pipelines, many automatic drain systems are often arranged to discharge water in the steam pipeline to ensure that there is no water accumulation in the pipeline. However, a drain well is arranged below the automatic drain system, and water is pumped out when there is a lot of water in the drain well. Since there are many drain points, the investment in the drain system is large and the maintenance workload is also large. After the steam passes through the desuperheater and pressure reducer, if the flow rate is less than the flow rate required by the specification, there will be a large temperature difference between the upper and lower walls of the outlet pipe of the desuperheater and pressure reducer. On the one hand, the large temperature difference between the upper and lower walls and the large thermal stress of the pipeline are not conducive to safe operation. On the other hand, inaccurate temperature measurement leads to automatic failure. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a steam transport pipe joint that can divert water to a high-temperature steam area, thereby utilizing superheated steam to vaporize water in the fluid and achieve mixing of the two, thereby being able to recover the working fluid, reduce the amount of water drainage in the transport network, and reduce or even eliminate the water drainage points in the steam transport network system, thereby reducing investment costs, reducing the maintenance workload of the steam transport pipeline, and reducing maintenance costs.

[0005] An embodiment of the present invention provides a steam transport pipe network system.

[0006] A steam conveying pipe segment according to an embodiment of the present invention comprises a steam pipe and a water retaining edge, wherein the water retaining edge is arranged on the inner wall surface of the steam pipe, and the water retaining edge has a first end and a second end in its extending direction, wherein the first end is located at or adjacent to one side of the steam pipe in a preset direction, and the second end is located in a range from the middle of the steam pipe in the preset direction to the other side, and the second end is located downstream of the first end in the fluid flow direction, and the water retaining edge has a guide groove, or the water retaining edge and the inner wall surface of the steam pipe are arranged to form a guide groove, and the guide groove is open on the side facing the fluid flow direction so that water in the steam pipe flows from the first end to the second end along the guide groove.

[0007] Therefore, the steam delivery pipe section of the embodiment of the present invention can guide water to the high-temperature steam area, so as to use the superheated steam to vaporize the water in the fluid and achieve the mixing of the two, so as to recover the working medium, reduce the amount of water drainage in the delivery pipe network, reduce or even eliminate the water drainage points in the steam delivery pipe network system, and then reduce the investment cost, reduce the maintenance workload of the steam delivery pipeline, and reduce the maintenance cost. When the steam delivery pipe section of the embodiment of the present invention participates in the transportation of the steam-water mixed fluid after the temperature reducer, it can reduce the temperature difference between the upper and lower sides of the steam-water mixed fluid, and then reduce the temperature difference between the upper and lower walls of the pipeline, solve the problem of inaccurate temperature measurement of the fluid after temperature reduction and pressure reduction, and ensure the safe operation of the temperature reducer when the flow rate is less than the specification requirement.

[0008] In some embodiments, the steam delivery pipe section further includes an atomizing nozzle, which is arranged on the second end, and has a liquid inlet and a spray outlet, the liquid inlet is connected to the guide groove, and the spray outlet is located downstream of the liquid inlet.

[0009] In some embodiments, the steam delivery pipe section further includes a connecting pipe, which is arranged at the second end of the water retaining edge, and the connecting pipe has an inlet and an outlet, the inlet is connected to the guide groove, the connecting section is connected to the atomizing nozzle, and the outlet is connected to the liquid inlet.

[0010] In some embodiments, at the connection between the second end and the connecting pipe, the contour of the inlet covers the contour of the guide groove.

[0011] In some embodiments, the extension direction of the atomizing nozzle points to the central axis of the steam pipe.

[0012] In some embodiments, the cross section of the water retaining edge on a plane perpendicular to its extension direction is arc-shaped, and the angle corresponding to the arc is 45°-100° or 135°-190°.

[0013] In some embodiments, the water retaining edge extends spirally along the pipe wall.

[0014] In some embodiments, the angle between the orientation of the first end and the axial direction of the steam pipe is 20°-40°.

[0015] In some embodiments, in the preset direction, the first end is located between the fifth and fourth divisions of the steam pipe, and the water retaining edge covers the one side of the steam pipe; and / or the number of spiral turns of the water retaining edge is between 0.4 and 0.7.

[0016] The steam transport pipe network system of the embodiment of the present invention includes the steam transport pipe section.

[0017] The steam transmission pipe network system of the embodiment of the present invention can recycle working fluid, reduce or even eliminate the drain system, reduce investment costs, reduce the maintenance workload of the steam transmission pipeline, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the structural schematic diagrams of the steam delivery pipe section according to an embodiment of the present invention;

[0019] Figure 2 This is the second structural schematic diagram of the steam delivery pipe section according to the embodiment of the present invention;

[0020] Figure 3 This is the third structural schematic diagram of the steam delivery pipe section according to the embodiment of the present invention;

[0021] Figure 4 is a cross-sectional view of one embodiment of a water retaining wall;

[0022] Figure 5 is a cross-sectional view of another embodiment of a water retaining wall;

[0023] Reference numerals:

[0024] The steam delivery pipe section 100 comprises a steam pipe 1, a water retaining edge 2, a first end 21, a second end 22, a guide groove 23, an atomizing nozzle 3, and a connecting pipe 4. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] Please refer to the attached Figures 1 to 5 , the steam transport pipe segment 100 and the steam transport pipe network system according to an embodiment of the present invention are described in detail.

[0027] The steam transport pipe segment 100 of the embodiment of the present invention comprises a steam pipe 1 and a water retaining edge 2. The water retaining edge 2 is provided on the inner wall surface of the steam pipe 1. The water retaining edge 2 has a first end 21 and a second end 22 in its extending direction. The first end 21 is located at or adjacent to the steam pipe 1 in a preset direction (e.g. Figure 1 The second end 22 is located in the range from the middle of the steam pipe 1 in the preset direction to the other side, and the second end 22 is located downstream of the first end 21 in the fluid flow direction. The water retaining edge 2 has a guide groove 23, or the water retaining edge 2 and the inner wall surface of the steam pipe 1 are surrounded to form the guide groove 23, and the guide groove 23 is open on the side facing the fluid flow direction, so that the water in the steam pipe 1 flows from the first end 21 to the second end 22 along the guide groove 23.

[0028] The steam transport pipe network system of the embodiment of the present invention comprises a steam transport pipe segment 100. The steam transport pipe segment 100 is installed in a superheated steam transport pipeline and / or in an outlet pipeline of a temperature reducing and pressure reducing device.

[0029] When the steam conveying pipe segment 100 according to the embodiment of the present invention is in use, the preset direction is the up-down direction, one side of the steam pipe 1 in the preset direction is the lower side of the steam pipe 1 , and the other side of the steam pipe 1 in the preset direction is the upper side.

[0030] exist Figure 1 In the direction shown, the fluid flows from left to right, and the second end 22 of the water retaining edge 2 is located on the right side of the first end 21 .

[0031] When the steam conveying pipe section 100 of the embodiment of the present invention participates in conveying superheated steam, if there is water in the steam fluid, since the heat of the steam is greater than that of the water, the water is located at the lower side of the entire fluid, that is, at the lower side of the steam pipe 1. When the steam fluid flows from left to right through the steam conveying pipe section 100 of the embodiment of the present invention, at least a portion of the water located at the lower side of the fluid will inevitably pass through the first end 21 of the water retaining edge 2. When the water passes through the first end 21 of the water retaining edge 2, it is blocked by the water retaining edge 2 and confined in the guide groove 23. At the same time, under the action of the flow power of the fluid itself, the water continues to flow downstream (that is, to the right) along the water retaining edge 2 (guide groove 23). When the water flows to the second end 22 of the water retaining edge 2, it is discharged from the second end 22. Since the second end 22 is located at the middle and upper side of the steam pipe 1, the water moves to the middle and upper side of the steam pipe 1 after being guided by the water retaining edge 2. In other words, the water moves to the area covered by the high-temperature steam. Then, the superheated steam heats the liquid water and vaporizes it into steam. The vaporized steam mixes with the original superheated steam and continues to flow downstream.

[0032] Therefore, the steam transport pipe segment 100 of the embodiment of the present invention can divert water to the high-temperature steam area, so as to utilize superheated steam to vaporize water in the fluid and achieve mixing of the two, thereby being able to recover the working fluid, reduce the amount of water drainage in the transport pipe network, reduce or even eliminate the water drainage points in the steam transport pipe network system, and then reduce investment costs, reduce the maintenance workload of the steam transport pipeline, and reduce maintenance costs.

[0033] When the steam conveying pipe segment 100 of the embodiment of the present invention participates in conveying a steam-water mixed fluid after the temperature reducer, water is located at the lower side of the fluid. When the water flows through the first end 21 of the water retaining edge 2, it flows along the guide groove 23 to the second end 22 and is discharged from the second end 22, that is, the water flows to the middle and upper part of the steam pipe 1 where the temperature is higher. The water exchanges heat with the steam located in the middle and upper part. If the steam temperature is high, the water will be heated and vaporized to form steam. If the steam temperature is not enough to vaporize the water, the water can also be heated. As a result, the temperature of the steam is reduced, thereby achieving mixing of water and steam in the steam-water mixed fluid, thereby reducing the temperature difference between the upper and lower sides of the steam-water mixed fluid, and then reducing the temperature difference between the upper and lower walls of the pipeline, solving the problem of inaccurate temperature measurement of the fluid after temperature reduction and pressure reduction, and ensuring the safe operation of the temperature reducer when the flow rate is less than the specification requirement.

[0034] It should be noted that the steam transport pipe segment 100 of the embodiment of the present invention is not limited to the application in the steam transport pipe network system, but can also be applied to other pipelines that need to transport steam-water mixture fluids, or to pipelines that transport fluids that are easily stratified.

[0035] Furthermore, the cross section of the water retaining edge 2 on a plane perpendicular to its extension direction is arc-shaped, and the angle corresponding to the arc is 45°-100° or 135°-190°. The arc-shaped water retaining edge 2 is easy to process, and the arc-shaped water retaining edge 2 itself or with the inner wall surface of the steam pipe 1 can form a semi-enclosed guide groove 23, ensuring the stability of water flowing in the guide groove 23, avoiding the problem that water, although blocked by the water retaining edge 2, is not in the encirclement formed by the water retaining ring and the inner wall surface of the steam pipe 1 and escapes from the water retaining edge 2, causing vortex or turbulence in the guide groove 23, thereby ensuring the effect of mixing steam and water in the steam delivery pipe section 100 of the embodiment of the present invention, thereby ensuring the recovery of the working medium and the reduction of the amount of hydrophobicity.

[0036] Optionally, the angle corresponding to the arc-shaped cross section of the water retaining edge 2 is 45°, 60°, 90° or 100°, and the water retaining edge 2 and the inner wall surface of the steam pipe 1 are surrounded to form a guide groove 23 .

[0037] Optionally, the angle corresponding to the arc-shaped cross section of the water retaining edge 2 is 135°, 150°, 180° or 190°, and the water retaining edge 2 itself forms a guide groove 23 .

[0038] Specifically, Figure 4 As shown, the angle corresponding to the water retaining edge 2 is 180°, that is, the cross section of the water retaining edge 2 is semicircular. Figure 5 As shown, the angle corresponding to the water retaining edge 2 is 90°, that is, the cross section of the water retaining edge 2 is a quarter circle.

[0039] In this embodiment, the angle corresponding to the cross section of the water retaining edge 2 is 180°.

[0040] In some embodiments, the water retaining edge 2 extends spirally along the pipe wall, that is, the water retaining edge 2 is spiral-shaped, such as Figure 1 and Figure 3 The spiral water retaining edge 2 makes the water flow in a spiral direction, with little change to the original rightward flow direction of the water, thereby reducing the disturbance generated during the flow of water through the water retaining edge 2 (guiding groove 23) and reducing the kinetic energy loss of the water.

[0041] The angle between the orientation of the first end 21 and the axial direction of the steam pipe 1 is 20°-40°, and the angle between the orientation of the first end 21 and the direction of fluid flow is 20°-40°, so that the spiral path of the water retaining edge 2 (the guide groove 23) has a certain length in the axial direction of the steam pipe 1, so that the movement process of water flowing from the lower side to the middle and upper side of the steam pipe 1 along the guide groove 23 has a certain time, which is conducive to the water being gradually heated by the adjacent superheated steam during the movement process, thereby reducing the temperature difference between the water discharged from the second end 22 and the surrounding superheated steam, thereby improving the effect of superheated steam heating vaporized water, and further reducing the hydrophobicity in the superheated steam. Moreover, the kinetic energy loss of water is small when it flows through the water retaining edge 2 (guide groove 23), thereby ensuring that the water flows smoothly from the first end 21 to the second end 22 and still has a certain kinetic energy or flow rate when it is discharged from the guide groove 23 from the second end 22, thereby reducing the difference between the flow rate of the water discharged from the second end 22 and the superheated steam, ensuring that the water can maintain a certain contact time with the superheated steam, thereby improving the heating and vaporization effect of the superheated steam on the water.

[0042] In this embodiment, the angle between the direction of the first end 21 and the axial direction of the steam pipe 1 is 30°.

[0043] The first end 21 is located between the fifth and fourth parts of the steam pipe 1, and the water retaining edge 2 covers the side (lower side) of the steam pipe 1. In other words, Figures 1 to 3 In the direction, if the first end 21 is located at the front side of the steam pipe 1, the first end 21 extends toward the rear side and toward the right side, that is, the spiral direction of the water retaining edge 2 rotates counterclockwise; if the first end 21 is located at the rear side of the steam pipe 1, the first end 21 extends toward the front side and toward the right side, that is, the spiral direction of the water retaining edge 2 rotates clockwise.

[0044] The first end 21 of the water retaining edge 2 and the part adjacent to the first end 21 can cover the lower side of the steam pipe 1, so that at least a part of the water on the front and rear sides of the lower side of the steam pipe 1 can be blocked by the water retaining edge 2, and flow along the guide groove 23 to the second end 22, so as to participate in heat exchange and be heated by the superheated steam. In this way, the water content in the fluid can be further reduced, the amount of water drainage can be further reduced, and the amount of working fluid recovered by the steam delivery pipe segment 100 of the embodiment of the present invention can be increased.

[0045] The number of spiral turns of the water retaining edge 2 is between 0.4 and 0.7.

[0046] In some embodiments, the steam delivery pipe section 100 further includes an atomizing nozzle 3, which is disposed on the second end 22. The atomizing nozzle 3 has a liquid inlet and a spray outlet, wherein the liquid inlet is connected to the guide groove 23, and the spray outlet is located downstream of the liquid inlet. After flowing out of the guide groove 23, water flows to the liquid inlet, and is formed into fine water (mist) beads through the atomizing nozzle 3 and sprayed out from the spray outlet to the surroundings. The superheated steam heats the water (mist) beads into steam, and the mixture flows to the right.

[0047] The steam conveying pipe segment 100 of the embodiment of the present invention atomizes water into smaller particles of water (mist) beads through the atomizing nozzle 3, thereby increasing the heat exchange area between superheated steam and water, and then improving the heating and vaporization effect of superheated steam on water, which can further reduce the water content in the fluid, further reduce the amount of hydrophobicity, and increase the amount of working fluid recovered by the steam conveying pipe segment 100 of the embodiment of the present invention.

[0048] In some embodiments, the steam delivery pipe section 100 further includes a connecting pipe 4, which is disposed at the second end 22 of the water retaining edge 2, and has an inlet and an outlet, wherein the inlet is connected to the guide groove 23, the connecting section is connected to the atomizing nozzle 3, and the outlet is connected to the liquid inlet. The connecting section is a circular pipe section, which facilitates the installation and connection of the water retaining edge 2 with the atomizing nozzle 3 through the connecting section, thereby improving the convenience of installing the atomizing nozzle 3.

[0049] In some embodiments, at the connection between the guide section and the connecting section, the contour of the inlet covers the contour of the guide groove 23, thereby reducing the resistance of the water flow and ensuring that the water in the guide groove 23 enters the connecting section smoothly.

[0050] In some embodiments, the extension direction of the atomizing nozzle 3 points to the central axis of the steam pipe 1. Figure 1 The extension direction of the atomizing nozzle 3 is obliquely downward, and correspondingly, the connecting pipe 4 is a curved pipe to ensure that the water (mist) drops sprayed by the atomizing nozzle 3 can have a larger contact area with the superheated steam, thereby improving the heating and vaporization effect of the superheated steam on water, which can further reduce the water content in the fluid, further reduce the amount of hydrophobicity, and increase the amount of working fluid recovered by the steam conveying pipe segment 100 of the embodiment of the present invention.

[0051] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A steam transport pipe segment (100), characterized in that: The invention comprises a steam pipe (1) and a water retaining edge (2), wherein the water retaining edge (2) is arranged on the inner wall surface of the steam pipe (1), and the water retaining edge (2) has a first end (21) and a second end (22) in its extension direction, wherein the first end (21) is located at or adjacent to one side of the steam pipe (1) in a preset direction, and the second end (22) is located in the range from the middle of the steam pipe (1) in the preset direction to the other side, and the second end (22) is located downstream of the first end (21) in the fluid flow direction, and the water retaining edge (2) has a guide groove (23), or the water retaining edge (2) and the inner wall surface of the steam pipe (1) are surrounded to form the guide groove (23), and the guide groove (23) is open on the side facing the fluid flow direction, so that water in the steam pipe (1) flows from the first end (21) to the second end (22) along the guide groove (23).

2. The steam transport pipe segment (100) according to claim 1, characterized in that: It further comprises an atomizing nozzle (3), the atomizing nozzle (3) being arranged on the second end (22), the atomizing nozzle (3) having a liquid inlet and a spray outlet, the liquid inlet being connected to the guide groove (23), and the spray outlet being located downstream of the liquid inlet.

3. The steam transport pipe segment (100) according to claim 2, characterized in that: It further comprises a connecting pipe (4), the connecting pipe (4) being arranged at the second end (22) of the water retaining edge (2), the connecting pipe (4) having an inlet and an outlet, the inlet being connected to the guide groove (23), the connecting section being connected to the atomizing nozzle (3), and the outlet being connected to the liquid inlet.

4. The steam transport pipe segment (100) according to claim 3, characterized in that: At the connection between the second end (22) and the connecting pipe (4), the contour of the inlet covers the contour of the guide groove (23).

5. The steam transport pipe segment (100) according to claim 4, characterized in that: The extension direction of the atomizing nozzle (3) points to the central axis of the steam pipe (1).

6. The steam transport pipe segment (100) according to claim 1, characterized in that: The cross section of the water retaining edge (2) on a plane perpendicular to its extension direction is arc-shaped, and the angle corresponding to the arc is 45°-100° or 135°-190°.

7. The steam transport pipe segment (100) according to claim 1, characterized in that: The water retaining edge (2) extends spirally along the pipe wall.

8. The steam transport pipe segment (100) according to claim 7, characterized in that: The angle between the orientation of the first end (21) and the axial direction of the steam pipe (1) is 20°-40°.

9. The steam transport pipe segment (100) according to claim 7, characterized in that: In the preset direction, the first end (21) is located between the fifth and fourth divisions of the steam pipe (1), and the water retaining edge (2) covers one side of the steam pipe (1); and / or the number of spiral turns of the water retaining edge (2) is between 0.4 and 0.

7.

10. A steam transmission pipe network system, characterized in that: The invention comprises the steam transport pipe segment (100) as claimed in any one of claims 1 to 9.

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