A ship bubbling deoxygenation device

Abstract

The invention relates to the technical field of ship steam power, and provides a ship bubbling deoxygenation device, comprising an air supply pipe and a bubbling tube connected to each other, wherein the bubbling tube comprises multiple stages, the heads and tails of the multiple stages of bubbling tubes are connected in sequence to form a tree-like fractal structure; the flow area of ​​the bubbling tube of the upper stage is equal to the sum of the flow areas of the bubbling tubes of the lower stage connected thereto; the bubbling tube is filled with porous materials; the invention ensures the uniformity of the flow distribution of steam in the bubbling tubes of each stage by filling the bubbling tubes of each stage with porous materials, and sequentially connects the bubbling tubes of each stage into a tree-like fractal structure, reduces the local violent vibration of the pipeline and the noise generated thereby, makes the steam injection uniform, realizes the uniform heating of condensed water, and avoids the occurrence of the "water hammer" phenomenon, thereby ensuring the effect of bubbling deoxygenation of the condensed water.

Description

Technical Field

[0001] The invention relates to the technical field of ship steam power, and in particular to a ship bubbling deoxygenation device. Background Art

[0002] At present, in order to improve efficiency, steam power systems generally use condensing steam turbines to generate a high vacuum in the condenser. However, due to the high oxygen content of air and make-up water leaking into the condenser, in order to prevent corrosion of thermal equipment and accessories such as valves and improve the heat exchange efficiency of the condenser, the circulating condensate needs to be deoxygenated during operation. Among them, thermal deoxygenation is the most commonly used deoxygenation method.

[0003] In order to save the precious operating space of the ship, a deaerator is not separately set in the ship's steam power system, and a bubbling deoxygenation scheme is adopted in which exhaust steam is introduced into the hot well corresponding to the condenser. By introducing high-pressure and high-temperature steam into the condensate with a certain vacuum degree and a low degree of supercooling to heat the condensate, the condensate temperature is close to saturation, and the partial pressure of water vapor at the vapor-liquid interface of the hot well is close to saturation, so that the gas (including oxygen) in the condensate is precipitated to achieve the deoxygenation function.

[0004] In the traditional bubbling device design, steam is introduced into the condensate space of the hot well through the bubbling tube hole or through the gap to form an underwater jet, and the condensate is heated by direct contact with the steam. This solution has a simple structure and is easy to implement, but it has the following main shortcomings:

[0005] (1) Steam injection heating is sensitive to injection parameters. When the condensate is injected and heated through the bubbling tube holes or gaps, there is a problem of uneven heating, which affects the overall deoxygenation effect.

[0006] (2) Since the steam pressure is much greater than the vacuum pressure of the condenser, the injection noise is obvious. At the same time, when the steam is injected into the condensate in the hot well, a large condensation collapse noise will be generated, increasing the risk of condenser failure and affecting the quietness of the ship;

[0007] (3) When the steam injection flow rate is low, it is easy to cause condensate backflow, forming a "water hammer" phenomenon, which will cause significant noise and even cause equipment damage.

[0008] In the degree thesis "Research on the Design of Low-Noise Exhaust Flow Channel Based on the Principle of Throttling and Pressure Reduction", it is pointed out that by setting up a multi-stage throttling orifice plate, the exhaust pressure is reduced to effectively reduce the deoxygenation method of injection noise. However, this deoxygenation method is mainly aimed at the exhaust of underwater insoluble gases, and does not involve steam bubbling. Although the use of throttling orifices can reduce noise to a certain extent, the use of multi-stage throttling orifices requires a long pipeline, and the use of throttling orifices causes drastic changes in local pressure, which will cause the bubbling tube itself to vibrate more, and also produce vibration noise. The use of small hole injection will also cause drastic changes in local pressure, leading to vibration and other problems.

[0009] In the patent document "A Bubbling Deoxygenation Condenser" with application number 201620263151.0, a serpentine steam coil is used as the steam inlet pipeline, and an air outlet is set on the steam coil to perform bubbling deoxygenation. This can increase the uniformity of heating the condensate to a certain extent, but it is difficult to eliminate the vibration noise generated during the operation and prevent the occurrence of "water hammer".

[0010] It can be seen that in the existing ship steam power system, when bubbling and deoxygenating the condensed water in the hot well, how to eliminate the steam injection noise and vibration and effectively prevent the occurrence of the "water hammer" phenomenon is a technical problem that urgently needs to be solved. Summary of the invention

[0011] 1. Technical issues to be resolved

[0012] The object of the present invention is to provide a ship bubbling deoxygenation device to solve the problems of steam injection noise and vibration and easy occurrence of "water hammer" phenomenon when bubbling deoxygenation is performed on condensed water in a ship hot well.

[0013] (II) Technical solution

[0014] In order to solve the above technical problems, the present invention provides a ship bubbling deoxygenation device, comprising an air supply pipe and a bubbling tube connected to each other, the bubbling tube comprising multiple levels, the heads and tails of the multiple levels of bubbling tubes are connected in sequence to form a tree-like fractal structure; the flow area of ​​the bubbling tube of the upper level is equal to the sum of the flow areas of each bubbling tube of the lower level connected thereto; and the bubbling tube is filled with a porous material.

[0015] Preferably, the tree-like fractal structure in the present invention is arranged axially symmetrically along the air supply pipe; the tree-like fractal structure includes multiple tree-like fractal structures, and the multiple tree-like fractal structures are arranged axially symmetrically along the same axial symmetry line, or are arranged centrally symmetrically along the same center point.

[0016] Preferably, in the present invention, the tail end of the bubbling tube of the upper stage is simultaneously connected to the head ends of the two bubbling tubes of the lower stage to form a tree-like fractal structure in the form of a binary tree.

[0017] Preferably, in the present invention, the angle between the two bubbling tubes constituting the bifurcation at each stage is 50° to 90°.

[0018] Preferably, the bubbling tube in the present invention comprises a tube body and a vent hole; the tube body is arranged transversely, and the vent hole is arranged on the side wall of the lower side of the tube body.

[0019] Preferably, in the present invention, a plurality of ventilation sections arranged at intervals are provided on the side wall at the lower side of the tube body along the axis; each of the ventilation sections includes a plurality of ventilation holes arranged along the radial direction.

[0020] Preferably, the diameter of the vent holes in the present invention is 0.5 to 2 mm.

[0021] Preferably, the gas flowing in the bubbling tube in the present invention is steam, and the porous material includes foamed metal.

[0022] Preferably, the pore size and porosity of the foam metal in the present invention increase step by step from the first stage to the last stage of the bubbling tube.

[0023] Preferably, in the present invention, the pore size and porosity of the foam metal filled in the bubbling tube of each stage gradually increase along the flow direction of the steam.

[0024] (III) Technical Effect

[0025] The ship bubbling deoxygenation device provided by the present invention provides a multi-stage bubbling tube filled with porous materials, and the bubbling tubes of each stage are connected in sequence to form a tree-like fractal structure, so that the pressure and flow rate of the gas (steam) introduced from the air supply pipe are gradually reduced to prevent local channel blockage, and the flow area of ​​the upper-stage bubbling tube is set to be equal to the sum of the flow areas of each bubbling tube of the next stage connected thereto, which is conducive to ensuring the uniformity of the flow distribution of steam in the bubbling tubes of each stage, thereby reducing the local violent vibration of the pipeline and the noise generated thereby; in addition, by filling the bubbling tube with porous materials, it is not only conducive to ensuring the uniformity of the flow rate through the vents on each bubbling tube during gas (steam) injection, thereby reducing the injection noise, but also under low flow conditions, due to the resistance of the porous material, it can effectively prevent the occurrence of condensed water backflow, avoid the occurrence of "water hammer" phenomenon, thereby ensuring the deoxygenation effect while reducing the noise on the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a ship bubbling deoxygenation device comprising two tree-like fractal structures shown in an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of one of the first-level bubbling tubes along the axial direction shown in an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of one of the first-level bubbling tubes along the radial direction shown in an embodiment of the present invention.

[0030] In the figure: 1. air supply pipe; 2. bubbling tube; 21. tube body; 22. vent hole; 3. three-way structure; 4. foam metal. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that, 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] See also Figure 1 The present embodiment provides a ship bubbling deoxygenation device, comprising an air supply pipe 1 and a bubbling tube 2 connected to each other, the bubbling tube 2 comprising multiple stages, the heads and tails of the multiple stages of the bubbling tubes 2 being connected in sequence to form a tree-like fractal structure; the flow area of ​​the upper stage of the bubbling tube 2 is equal to the sum of the flow areas of the lower stage of the bubbling tubes 2 connected thereto; the bubbling tube 2 is filled with a porous material.

[0034] Specifically, by Figure 1In the structure shown, two tree-like fractal structures are provided, each of which includes an air supply pipe 1 and four levels of bubbling tubes 2 connected in sequence, wherein the air supply end of the air supply pipe 1 is connected to the head end of the bubbling tube 2 at the first level, the tail end of the bubbling tube 2 at the first level is connected to the tail end of the bubbling tube 2 at the corresponding second level, and so on. Since there are multiple bubbling tubes 2 at each level, this connection structure constitutes a tree-like fractal structure.

[0035] The ship bubbling deoxygenation device shown in this embodiment is provided with a multi-stage bubbling tube 2 filled with porous material, and the bubbling tubes 2 of each stage are connected in sequence to form a tree-like fractal structure, so that the pressure and flow rate of the gas (steam) introduced from the air supply pipe 1 are gradually reduced to prevent local channel blockage, and the flow area of ​​the upper-stage bubbling tube 2 is set to be equal to the sum of the flow areas of each bubbling tube 2 of the next stage connected thereto, which is conducive to ensuring the uniformity of the flow distribution of steam in the bubbling tubes 2 of each stage, thereby reducing the local violent vibration of the pipeline and the noise generated thereby; at the same time, by filling the bubbling tube 2 with porous material, it is not only conducive to ensuring the uniformity of the flow rate through the vents 22 on each bubbling tube 2 during gas (steam) injection, thereby reducing the injection noise, but also under low flow conditions, due to the resistance of the porous material, it can effectively prevent the backflow of condensed water and avoid the occurrence of "water hammer", thereby ensuring the deoxygenation effect while reducing the noise on the ship.

[0036] In addition, it should be pointed out that the porous material can be a material having a network structure composed of mutually interpenetrating or closed holes, such as asbestos, foam metal, etc., or it can be a metal mesh, a throttling orifice plate and a combination structure arranged in layers in the bubbling tube 2. As long as the corresponding structure ensures the uniformity of the flow distribution of the gas in the bubbling tubes 2 at each level, it belongs to the protection scope of the present invention. In actual application, considering that the gas introduced into the bubbling tube 2 is mostly high-temperature and high-pressure new steam or exhaust steam, it is necessary to adaptively select the porous material.

[0037] Furthermore, in this embodiment, the tree-like fractal structure is arranged axially symmetrically along the air supply pipe 1; the tree-like fractal structure includes multiple tree-like fractal structures, and the multiple tree-like fractal structures are arranged axially symmetrically along the same axial symmetry line, or are arranged centrally symmetrically along the same center point.

[0038] Specifically, in Figure 1The diagram shows two tree-like fractal structures arranged symmetrically relative to each other, which is only for the convenience of describing the shape of the tree-like fractal structure shown in this embodiment and one of its actual arrangement structures, rather than indicating or implying that the tree-like fractal structure referred to cannot be arranged in other forms. This embodiment arranges multiple tree-like fractal structures in an axially opposed or centrally symmetrical manner, and when such an arrangement structure is used for deoxygenating condensed water in a hot well corresponding to a condenser on a ship, it is beneficial to ensure the uniform arrangement of multiple tree-like fractal structures in the hot well, ensure the uniformity of the injected steam flow rate, make the temperature of the condensed water approach saturation as soon as possible and precipitate the dissolved gas therein, thereby further ensuring the deoxygenation effect.

[0039] Furthermore, in this embodiment, the tail end of the upper-stage bubbling tube 2 is connected to the head ends of the two lower-stage bubbling tubes 2 through the three-way structure 3 to form a tree-like fractal structure in the form of a binary tree.

[0040] Specifically, by designing the tree-like fractal structure in the form of a binary tree, it is not only convenient to realize the corresponding connection between the bubbling tubes 2 at each level, but also helps to ensure that the distribution of the steam flow is more uniform, and the corresponding steam outlet distribution of the vents 22 on each bubbling tube 2 is more uniform, thereby reducing the vibration of the pipeline, and correspondingly ensuring the uniformity of the heating of the condensed water, thereby improving the deoxygenation efficiency.

[0041] Furthermore, in this embodiment, the angle between the two bubbling tubes 2 constituting the fork at each stage is 50° to 90°.

[0042] Specifically, by setting the angle between each of the two forked bubbling tubes 2 in this way, it is helpful to further ensure that the tree-like fractal structure in the form of a binary tree is distributed in a divergent manner, thereby ensuring the uniform arrangement of each bubbling tube 2, which in turn ensures the uniformity of the steam outlet distribution corresponding to the vent holes 22 on each bubbling tube 2.

[0043] For further information, see Figure 2 and Figure 3 In this embodiment, the bubbling tube 2 includes a tube body 21 and a vent hole 22 ; the tube body 21 is arranged horizontally, and the vent hole 22 is provided on the side wall of the lower side of the tube body 21 .

[0044] Specifically, in order to prevent impurities in the condensed water from clogging the air holes 22 on the bubbling tube 2, and in order to make the condensed water heated more evenly, each air hole 22 is arranged on the lower side of the tube body 21. This allows the bubbles generated during steam injection to condense and heat the condensed water during the buoyancy process, thereby ensuring the heating effect of the condensed water, so that the temperature of the condensed water approaches saturation as soon as possible and the dissolved gas in it is precipitated.

[0045] For further information, see Figure 2 and Figure 3In this embodiment, a plurality of ventilation sections are arranged at intervals along the axis on the side wall of the lower side of the tube body 21; each ventilation section includes a plurality of ventilation holes 22 arranged along the radial direction.

[0046] Specifically, in Figure 2 Nine ventilation sections are shown on the side wall of the lower side of the tube body 21. Figure 3 As can be seen from the cross-sectional structure shown, six radially arranged vent holes 22 are provided in each vent section, wherein the aperture of each vent hole 22 is set to 0.5-2 mm. Thus, under the premise of maintaining a certain injection area, by setting a smaller aperture of the vent holes 22 for steam injection and increasing the number of vent holes 22, the steam injection effect is ensured while the noise generated during injection is greatly reduced.

[0047] Furthermore, in this embodiment, the gas flowing in the bubbling tube 2 is steam, and the porous material includes foam metal 4 .

[0048] Specifically, the foam metal 4 can be made of foam copper or foam aluminum. The foam metal 4 not only ensures the uniformity of the flow rate through each vent 22 when the bubbling tube 2 is performing steam injection and prevents the occurrence of the "water hammer" phenomenon, but also has the effect of heat conduction, which is beneficial to enhance the heat exchange between steam and condensed water, making the heating of the condensed water more uniform and efficient, and greatly improving the deoxygenation efficiency.

[0049] Furthermore, in one of the specific embodiments, the pore size and porosity of the foam metal 4 increase step by step from the first stage to the last stage of the bubbling tube 2 .

[0050] Specifically, since the foam metal 4 is filled in each stage of the bubbling tube 2, when the steam is transported along the various stages of the bubbling tube 2 in sequence, the steam resistance will gradually increase and the corresponding permeability will gradually decrease, so that the aperture of each hole in the foam metal 4 and the porosity of the foam metal 4 are set to increase step by step from the first stage to the last stage of the bubbling tube 2, which is conducive to ensuring the uniformity of flow distribution in the various stages of the bubbling tube 2, and correspondingly ensures the uniformity of heat exchange; in addition, this also makes the steam pressure drop smoothly when passing through the various stages of the bubbling tube 2, avoiding the strong vibration noise generated during steam injection due to the large pressure difference.

[0051] Further, in another specific embodiment, the pore size and porosity of the foam metal 4 filled in the bubbling tube 2 of each stage gradually increase along the flow direction of the steam, see Figure 2 .

[0052] Specifically, for each level of the bubbling tube 2, when the foam metal 4 is filled inside, the steam pressure in the bubbling tube 2 of this level also shows a gently downward trend. Therefore, when the pore size and porosity of the foam metal 4 are gradually increased along the flow direction of the steam, this is also conducive to ensuring the uniformity of the steam flow distribution in each ventilation section in the bubbling tube 2 of this level, thereby ensuring the uniformity of heat exchange.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ship bubbling deoxygenation device, comprising an air supply pipe and a bubbling pipe connected to each other, characterized in that: The bubbling tubes include multiple stages, and the heads and tails of the multiple stages of bubbling tubes are connected in sequence to form a tree-like fractal structure; The flow area of ​​the bubbling tube of the previous stage is equal to the sum of the flow areas of the bubbling tubes of the next stage connected thereto; the bubbling tube is filled with a porous material; The tree-like fractal structure is arranged axially symmetrically along the air supply pipe; the tree-like fractal structure includes a plurality of tree-like fractal structures, and the plurality of tree-like fractal structures are arranged axially symmetrically along the same axial symmetry line, or are arranged centrally symmetrically along the same central point; The tail end of the bubbling tube of the previous stage is simultaneously connected to the head ends of the two bubbling tubes of the next stage to form a tree-like fractal structure in the form of a binary tree.

2. The ship bubbling deoxygenation device according to claim 1, characterized in that: The angle between the two bubbling tubes forming the fork at each stage is 50° to 90°.

3. The ship bubbling deoxygenation device according to claim 1, characterized in that: The bubbling tube comprises a tube body and a vent hole; The tube body is arranged in a transverse direction, and the vent hole is arranged on the side wall at the lower side of the tube body.

4. The ship bubbling deoxygenation device according to claim 3, characterized in that: A plurality of ventilation sections arranged at intervals are provided on the side wall at the lower side of the tube body along the axis; Each of the ventilation segments includes a plurality of ventilation holes arranged in a radial direction.

5. The ship bubbling deoxygenation device according to claim 3, characterized in that: The diameter of the vent hole is 0.5-2 mm.

6. The ship bubbling deoxygenation device according to any one of claims 1 to 5, characterized in that: The gas flowing in the bubbling tube is steam, and the porous material comprises foam metal.

7. The ship bubbling deoxygenation device according to claim 6, characterized in that: The pore size and porosity of the foam metal increase step by step from the first stage to the last stage of the bubbling tube.

8. The ship bubbling deoxygenation device according to claim 6, characterized in that: The pore size and porosity of the foam metal filled in the bubbling tube of each stage gradually increase along the flow direction of the steam.

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