A vertical water tank of a marine deaerator

Abstract

The present invention relates to a vertical water tank of a marine deaerator. The vertical water tank includes an anti-slosh structure, and a reboiler is arranged below the anti-slosh structure; the anti-slosh structure divides the inner cavity of the vertical water tank into multiple partition cavities; the bottoms of the partition cavities are communicated; the reboiler is a steam jet ejector structure, including a spray pipe and a steam ejector. The spray pipe is connected to a steam outlet outside the vertical water tank, and has several first small holes above it; the steam ejector includes a nozzle, a mixer and a diffuser pipe; the steam fed into the spray pipe enters the mixer through the nozzle; a plurality of water inlet holes are uniformly distributed on the side wall of the mixer, and water enters the mixer through the water inlet holes and mixes with the steam to form a steam-water mixture; the diffuser pipe jets the steam-water mixture upward; a water outlet is arranged at the bottom of the vertical water tank, and the deaerated feed water flows out through the water outlet. When the ship tilts and sways during navigation, the present invention will not cause water level sloshing, avoiding affecting the safety of the equipment body and the water level monitoring of the system.

Description

Technical Field

[0001] The present invention relates to the field of marine boiler water treatment devices, and particularly to a vertical water tank of a marine deaerator. Background Art

[0002] Deaerators are widely used in boiler feed water heating systems. They mainly use the extraction steam of steam turbines to heat the boiler feed water to the saturation temperature to remove oxygen and other dissolved gases in the feed water, so as to prevent the corrosion and failure of the boiler. Secondly, they use waste heat to preheat the feed water and recover the heat of the waste steam to improve the efficiency of the steam cycle. Installing a deaerator in the boiler feed water system of a steam-powered ship can also buffer and store the heated and deaerated feed water when the load of the boiler changes.

[0003] Due to the limited space in the ship's cabin, generally, marine deaerators use vertical water tanks. As shown in Figure 1 , the vertical water tank 1 is used to buffer and store the heated and deaerated feed water; the support 2 is used to be fixed on the ship's hull base to ensure the reliable installation of the equipment; the whole process of thermal deaeration occurs in the deaerator head 3, and the deaerator head 3 is directly connected to the vertical water tank 1 by a saddle-shaped seat.

[0004] Since the ship sails in the sea and is affected by water waves and wind waves, the ship will tilt (roll, pitch) and sway. As a water volume buffer container in the boiler feed water system, the deaerator will store a large amount of boiler feed water, generally meeting the water volume for 5 minutes of operation. When the ship tilts and sways, the feed water with a higher water level stored in the vertical water tank 1 will surge. On the one hand, it will cause an impact on the equipment itself, and on the other hand, it will cause the water level to become unstable, bringing great risks to the operation of the feed water pump and the water level monitoring of the entire feed water system. Summary of the Invention

[0005] To solve the problems existing in the above-mentioned prior art, the present invention provides a vertical water tank of a marine deaerator. The purpose of the present invention is to set an anti-surge structure in the vertical water tank so that when the ship tilts and sways during navigation, the feed water stored in the vertical water tank of the deaerator is cut into smaller liquid surfaces and no water level surging will occur, thereby avoiding affecting the safety of the equipment body and the water level monitoring of the system. In addition, this structure will not hinder personnel from entering the vertical water tank for maintenance work. A water injection reboiler device is arranged in the vertical water tank. On the one hand, steam is introduced below the water surface of the vertical water tank to supplement the deaeration of the feed water; on the other hand, the feed water is heated by steam injection and entrainment, greatly reducing the noise that may be generated due to bubbling. The bottom of the vertical water tank is provided with a drain outlet with a hood and an anti-whirlpool design, which can prevent foreign objects from entering the feed water pump on the one hand and avoid the occurrence of water flow vortices to reduce the resistance loss on the other hand.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vertical water tank of a marine deaerator, the vertical water tank is arranged at the lower part inside the deaerator, includes an anti-surge structure, and a reboiling device is arranged below the anti-surge structure inside the vertical water tank;

[0008] The anti-surge structure divides the inner cavity of the vertical water tank into multiple partition cavities; the bottoms of the partition cavities are communicated;

[0009] The reboiling device is a steam injection and ejector structure, includes a spray pipe and a steam ejector, the spray pipe is connected to a steam outlet outside the vertical water tank, and has several first small holes above it; the steam ejector includes a nozzle, a mixer and a diffuser pipe; the nozzle is installed on the first small holes, the mixer is installed on the nozzle, and the steam fed into the spray pipe enters the mixer through the nozzle; a plurality of water inlet holes are evenly distributed on the side wall of the mixer, water enters the mixer through the water inlet holes, and is mixed with the steam to form a steam-water mixture; the diffuser pipe is installed at the top of the mixer and jets the steam-water mixture upward;

[0010] A water outlet is arranged at the bottom of the vertical water tank, and the deaerated feed water flows out through the water outlet.

[0011] Further, the mixer has a hollow and through conical cylinder structure, and a plurality of the water inlet holes are evenly distributed around the side wall of the conical cylinder of the mixer. The mixer is placed on the top flange at the top of the nozzle through a bottom flange and is connected by bolts.

[0012] Further, a spiral groove is opened on the inner wall of the diffuser pipe. The diffuser pipe has an inclined pipe section and a straight pipe section connected to a small opening at the upper end of the inclined pipe section. The upper end of the conical cylinder of the mixer has a diffuser pipe installation cylinder with internal threads. The outer surface of the straight pipe section of the diffuser pipe has external threads, and is installed at the top of the mixer by matching with the internal threads of the diffuser pipe installation cylinder. The outer surface of the inclined pipe section of the diffuser pipe is matched and pressed with the inclined surface of the inner wall of the conical cylinder of the mixer.

[0013] Further, the anti-surge structure is a set of cross-shaped water tank partitions, and the water tank partitions are composed of 3 first partitions and 1 second partition welded in a cross shape.

[0014] Further, the outer edges of the first partition and the second partition are fixed to the inner wall surface of the vertical water tank by intermittent welding, and the connection at the inner edges of the first partition and the second partition is fixed by full welding.

[0015] Further, a waist-shaped manhole is arranged in the middle of the first partition.

[0016] Furthermore, a hood is installed on the top of the water outlet, and several second small holes are evenly arranged on the hood, and the diameter of the second small holes is smaller than the minimum size of all internal components of the deaerator head.

[0017] Furthermore, a cross-shaped baffle is arranged in the water outlet and penetrates through the water outlet.

[0018] Advantages of the present invention:

[0019] By arranging cross-shaped water tank partitions inside the vertical water tank, the present invention can reduce the free liquid surface area, avoid large liquid level fluctuations when the ship tilts and sways during navigation, thereby avoiding damaging the safety of the water tank body, and also avoid false liquid levels at the parts near the edge of the water tank caused by tilting, thus affecting the monitoring of the system water level. A waist-shaped manhole is arranged on the first partition to ensure that personnel can enter any compartment during maintenance. The bottoms of multiple compartments are connected, so that the water levels in the compartments are the same.

[0020] The present invention is provided with a reboiling device below the anti-surge structure, which can use steam to heat the deoxygenated feed water in the vertical water tank, and prevent the feed water from re-absorbing dissolved oxygen to the greatest extent. The reboiling device consists of a spray pipe and a steam ejector. The spray pipe is of a ring structure. The steam ejector consists of a nozzle, a mixer and a diffuser pipe. Steam is ejected from the nozzle, and the pressure energy of the steam is converted into kinetic energy, driving the surrounding water into the mixer. The steam as the entrainment medium and the entrained water flow and mix in the mixer, and flow through the diffuser pipe for further diffusion and pressure reduction. Water is used to reduce the steam temperature and reduce the bubbling of the steam. Finally, the steam-water mixture ejected from the diffuser pipe has smaller bubbles, which is beneficial to reducing the noise and bubble impact when the steam heats the feed water. A spiral groove is opened on the inner wall of the diffuser pipe, so that the height of the diffuser pipe becomes smaller, reducing the overall height of the steam ejector, and it can be applied to the deaerator device with limited height of the vertical water tank. At the same time, due to the large impact force of the steam-water mixture, the mixer and the diffuser pipe are easily damaged. The mixer is connected to the nozzle by a flange, and the mixer and the diffuser pipe are connected in a detachable manner. While ensuring the connection strength, it is also convenient to replace when the mixer or the diffuser is damaged. The lower end of the diffuser pipe is provided with an inclined pipe section, so that the high-pressure and high-speed steam will not directly scour the corner part with stress concentration of the mixer, and the flow field of the steam-water mixture entering the straight pipe section of the diffuser pipe is more stable.

[0021] In addition, a cross-shaped baffle is arranged in the water outlet of the vertical water tank of the present invention as an anti-whirlpool structure, which is beneficial to reducing the outlet resistance loss. Description of the drawings

[0022] Figure 1 is a schematic structural diagram of a marine deaerator in the prior art;

[0023] Figure 2 is a schematic structural diagram of the vertical water tank of the marine deaerator of the present invention;

[0024] Figure 3 This is the developed view of the partition plate of the vertical water tank of the marine deaerator of the present invention;

[0025] Figure 4 This is the schematic structural view of the reboiling device in the present invention;

[0026] Figure 5 This is the schematic structural view and the view in the A-A direction of the steam ejector in the present invention;

[0027] Figure 6 This is the schematic structural view of the water outlet in the present invention;

[0028] Figure 7 This is the schematic view of the cross-shaped baffle inside the water outlet of the present invention.

[0029] Wherein: 1 - vertical water tank, 2 - support, 3 - deaeration head, 4 - first partition plate, 5 - second partition plate, 6 - reinforcing rib, 7 - flat plate, 8 - spray pipe, 9 - nozzle, 10 - mixer, 11 - diffuser pipe, 12 - hood, 13 - cross-shaped baffle. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the technical solution of the present application, the following will further describe the present invention in detail with reference to the drawings and embodiments.

[0031] The orientation terms such as up, down, left, right, front and back in the present application document are established based on the positional relationship shown in the drawings. If the drawings are different, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as a limitation to the protection scope.

[0032] In the present invention, the terms "installation", "connection", "engagement", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or a connection that can communicate with each other, a direct connection, an indirect connection through an intermediate medium, a connection inside two components, or an interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] This embodiment describes a vertical water tank of a marine deaerator. The vertical water tank of the deaerator is arranged at the lower part inside the deaerator, and there is no water level agitation inside the vertical water tank, which can avoid affecting the safety of the equipment body and the water level monitoring of the system.

[0034] The vertical water tank is provided with an anti-slosh structure to avoid large liquid level sloshing when the ship tilts or sways during navigation, thus preventing damage to the safety of the water tank body and also avoiding false liquid levels near the edge of the water tank due to tilting, which may cause the system to lose water.

[0035] As Figure 2 shown, in this embodiment, the anti-slosh structure is a set of cross-shaped water tank partitions, which divide the inner cavity of the vertical water tank 1 into 4 compartments to greatly reduce the free liquid surface area. The water tank partitions are composed of 3 first partitions 4 and 1 second partition 5 welded in a cross shape. There is a certain gap between the bottoms of the first partition 4 and the second partition 5 after welding and the lower head of the vertical water tank 1, and the bottoms of the 4 compartments are connected, so that the water levels in the 4 compartments of the vertical water tank 1 are the same, avoiding uneven liquid levels in the 4 compartments. The adjacent partitions among the 3 first partitions 4 and 1 second partition 5 are perpendicular to each other. The outer edges of the first partition 4 and the second partition 5 are fixed to the inner wall surface of the vertical water tank 1 by intermittent welding to prevent large deformation caused by full welding. The inner edges of the first partition 4 and the second partition 5 are connected by full welding to increase the structural stability.

[0036] The first partition 4 and the second partition 5 have the same shape and size. The difference is that a waist-shaped manhole is provided in the middle of the first partition 4. During equipment maintenance, maintenance personnel enter a compartment through the manhole provided on the vertical water tank 1 and then enter any compartment through the waist-shaped manhole on the first partition 4.

[0037] In this embodiment, the first partition 4 and the second partition 5 can be made of flat plates 7 respectively, or two first partitions 4 or one first partition 4 and one second partition 5 can be jointly arranged on a flat plate 7. As Figure 3 shown, the symmetrically arranged two first partitions 4 and the middle upper parts of the symmetrically arranged first partition 4 and the second partition 5 are welded and connected by reinforcing ribs 6 respectively, which can greatly strengthen the connection strength between the partitions.

[0038] A reboiling device is arranged near the center of the bottom below the water surface of the vertical water tank 1. The reboiling device in this embodiment adopts a steam jet ejector structure to introduce steam to heat the feed water and reduce the bubbling noise.

[0039] As Figure 4 shown, the reboiling device includes a spray pipe 8 and a steam ejector. The spray pipe 8 is connected to the steam outlet outside the vertical water tank 1 through a pipeline, and steam is introduced into the spray pipe 8 below the water surface of the vertical water tank 1. The spray pipe 8 adopts an annular structure and is spliced by multiple annular pipe segments and straight pipe segments. Several first small holes are opened above the spray pipe 8, and a miniature steam ejector is welded to the outlet of each first small hole. Since the steam pressure is higher than the pressure inside the vertical water tank 1, the steam is ejected upward through the steam ejector. In order to make the steam spray evenly, several first small holes are evenly distributed on the spray pipe 8.

[0040] As Figure 5 shown, the steam ejector consists of a nozzle 9, a mixer 10 and a diffuser tube 11. The nozzle 9 is installed on the first small hole and placed below the center of the mixer 10. The mixer 10 has a hollow and through conical cylinder structure, which is welded to the bottom flange and placed on the top flange of the nozzle 9 through the bottom flange and connected by bolts. At the same time, due to the large impact force of the steam-water mixture, the mixer 10 or the diffuser tube 11 is easily damaged. By installing through the flange, when the mixer 10 or the diffuser tube 11 is damaged, it can be replaced. A plurality of water inlet holes are evenly distributed around the side wall of the mixer 10, so that water can enter the mixer 10 from all around and mix with steam to form a steam-water mixture. The diffuser tube 11 is inserted into the top end of the mixer 10 for spraying the steam-water mixture upward, or the diffuser tube 11 can also be threadedly connected to the mixer 10, which is convenient for the diffuser tube 11 to be disassembled from the mixer 10. Preferably, the side wall at the connection of the bottom end of the diffuser tube 11 and the mixer 10 is an inclined surface, which is connected to the inclined surface of the mixer 10 to prevent the diffuser tube 11 from being separated from the mixer 10 with the ejection of the steam-water mixture.

[0041] When steam is introduced into the spray tube 8, since the steam pressure is higher than the pressure in the vertical water tank 1, the steam is ejected from the nozzle 9, and the pressure energy of the steam is converted into kinetic energy, driving the surrounding water into the mixer 10. The steam as the entrainment medium and the entrained water flow and mix in the mixer 10, and flow through the diffuser tube 11 for further diffusion and pressure reduction. Water is used to reduce the steam temperature and reduce the steam bubbling. Finally, the steam-water mixture ejected from the diffuser tube 11 has smaller bubbles, which is beneficial to reducing the noise and bubble impact when the steam heats the feed water.

[0042] At the same time, in order to increase the mixing of steam and water and reduce the steam bubbling, a spiral groove is opened on the inner wall of the diffuser tube 11, so that the height of the diffuser tube 11 becomes smaller, reducing the overall height of the steam ejector, and it can be applied to the deaerator device with limited height of the vertical water tank.

[0043] A smooth water outlet is provided at the bottom of the vertical water tank 1. The deaerated feed water flows into the lower water pipe through the water outlet at the bottom of the vertical water tank 1 and then flows to the feed water pump. As Figure 6 shown, a hood 12 is installed at the top of the water outlet. A plurality of second small holes are evenly provided on the hood 12. The diameter of the second small holes should be smaller than the minimum size of all the internal parts in the deaerator head 3 to prevent the internal parts of the deaerator head 3 from being damaged and falling and then entering the feed water pump to damage the unit. As Figure 7 shown, a cross-shaped baffle 13 is also installed in the water outlet and penetrates through the water outlet to prevent the water from forming a vortex and entering the lower water pipe, thereby reducing the resistance loss of the water flow in the lower water pipe.

[0044] Although the principles of the present invention have been described in detail above in connection with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are merely illustrative implementations of the present invention and do not limit the scope of the present invention. The details in the embodiments do not constitute a limitation on the scope of the present invention. Without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformations and simple substitutions based on the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A vertical water tank of a marine deaerator, characterized in that The vertical water tank (1) is arranged at the lower part inside the deaerator and includes an anti-surge structure. A reboiling device is arranged below the anti-surge structure inside the vertical water tank (1). The anti-surge structure is a set of cross-shaped water tank partitions, which are composed of 3 first partitions (4) and 1 second partition (5) welded in a cross shape. The anti-surge structure divides the inner cavity of the vertical water tank (1) into multiple compartments. The bottoms of the compartments are communicated with each other. The reboiling device is a steam injection and ejection structure, including a spray pipe (8) and a steam injector. The spray pipe (8) is connected to the steam outlet outside the vertical water tank (1), and there are several first small holes above it. The steam injector includes a nozzle (9), a mixer (10) and a diffuser pipe (11). The nozzle (9) is installed on the first small holes, and the mixer (10) is installed on the nozzle (9). The steam fed into the spray pipe (8) enters the mixer (10) through the nozzle (9). A plurality of water inlet holes are evenly distributed on the side wall of the mixer (10). The mixer (10) has a hollow and through conical cylinder structure, and a plurality of the water inlet holes are evenly distributed around the side wall of the conical cylinder of the mixer (10). The mixer (10) is placed on the top flange at the top of the nozzle (9) through the bottom flange and is connected by bolts. Water enters the mixer (10) through the water inlet holes and mixes with the steam to form a steam-water mixture. The diffuser pipe (11) is installed at the top of the mixer (10) and ejects the steam-water mixture upward. A water outlet is arranged at the bottom of the vertical water tank (1), and the deaerated feed water flows out through the water outlet.

2. The vertical water tank of the marine deaerator according to claim 1, characterized in that, A spiral groove is formed on the inner wall of the diffuser pipe (11). The diffuser pipe (11) has an inclined pipe section and a straight pipe section connected to the small opening at the upper end of the inclined pipe section. The upper end of the conical cylinder of the mixer (10) has a diffuser pipe installation cylinder with internal threads. The straight pipe section of the diffuser pipe (11) has external threads and is installed at the top of the mixer (10) by matching with the internal threads of the diffuser pipe installation cylinder. The outer surface of the inclined pipe section of the diffuser pipe (11) is matched and pressed with the inclined surface of the inner wall of the conical cylinder of the mixer (10).

3. The vertical water tank of the marine deaerator according to claim 1, characterized in that, The outer edges of the first partition (4) and the second partition (5) are fixed to the inner wall surface of the vertical water tank (1) by intermittent welding, and the inner edges of the first partition (4) and the second partition (5) are fixed by full welding.

4. The vertical water tank of the marine deaerator according to claim 1 or 3, characterized in that, A waist-shaped manhole is arranged in the middle of the first partition (4).

5. The vertical water tank of the marine deaerator according to claim 1, characterized in that, A hood (12) is installed at the top of the water outlet. A plurality of second small holes are evenly arranged on the hood (12), and the diameter of the second small holes is smaller than the minimum size of all internal parts of the deaerator head (3).

6. The vertical water tank of the marine deaerator according to claim 1, characterized in that, A cross-shaped baffle (13) passing through the water outlet is arranged inside the water outlet.

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