Micro-bubble separation device for ship ballast water treatment and use method

Abstract

The invention discloses a microbubble separation device for ship ballast water treatment and a use method. The device comprises a first-stage separation tank, a water inlet is formed in the bottom of the side face of the first-stage separation tank, a water outlet is formed in the upper portion of the side face of the first-stage separation tank, an exhaust pipeline is arranged at the top of the first-stage separation tank, and a breather valve is arranged at an outlet of the exhaust pipeline; a first fixed pore plate is arranged in the first-stage separation tank, the height of the first fixed pore plate is higher than that of the water outlet, and an exhaust hole is formed in the first fixed pore plate; a flow guide column is installed on the bottom face of the first fixing hole plate and is hollow, air holes allowing bubbles to penetrate through are formed in all the wall faces of the flow guide column, and a flow guide plate is spirally wound around the outer wall face of the flow guide column. Through cooperation of the flow guide columns and the flow guide plates, microbubbles in seawater are effectively separated, corrosion of the microbubbles to the ship body is avoided, and the safety of the ship body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship equipment, and in particular to a microbubble separation device for ship ballast water treatment and a use method thereof. Background Art

[0002] In the treatment of ship ballast water discharge, the effective removal of bacterial spores is crucial for meeting the environmental protection requirements of the International Maritime Organization (IMO). Traditional treatment processes employ a combination of ultrasonic pretreatment and ultraviolet inactivation, using the mechanical shear force generated by ultrasound to destroy bacterial cell and spore walls before sterilizing them with ultraviolet irradiation. However, this method has significant limitations. Continuous ultraviolet irradiation consumes significant amounts of energy and is costly.

[0003] The recent emergence of micro-nano bubble treatment technology offers a new approach to ballast water treatment. The instantaneous high temperature and high pressure generated by the collapse of these bubbles effectively kills bacteria and spores, significantly improving sterilization efficiency. However, this technology also has drawbacks: if seawater treated with micro-nano bubbles enters the ship's hold directly, the cavitation caused by the bubble collapse can cause long-term corrosion to the ship's structure, seriously impacting vessel safety. Therefore, a treatment device that can effectively separate microbubbles from ballast water is urgently needed. Summary of the Invention

[0004] Purpose of the invention: In response to the above shortcomings, the present invention provides a microbubble separation device and method for ship ballast water treatment, which can effectively separate microbubbles in seawater, avoid corrosion of the hull by microbubbles, and improve the safety of the hull.

[0005] Technical solution: In order to solve the above problems, the present invention adopts a microbubble separation device for ship ballast water treatment, including a first-level separation tank, a water inlet is provided at the bottom of the side of the first-level separation tank, a water outlet is provided at the upper part of the side of the first-level separation tank, an exhaust pipe is provided on the top of the first-level separation tank, and a breathing valve is provided at the outlet of the exhaust pipe; a first fixed orifice plate is provided in the first-level separation tank, the first fixed orifice plate is set at a height higher than the water outlet, and an exhaust hole is provided on the first fixed orifice plate; a guide column is installed on the bottom surface of the first fixed orifice plate, the guide column is hollow inside, and each wall surface of the guide column is provided with an air hole for bubbles to pass through, and a guide plate is spirally coiled on the outer wall surface of the guide column.

[0006] Furthermore, it also includes a secondary separation tank arranged above the primary separation tank, the primary separation tank and the secondary separation tank are connected through a connecting pipe and a reflux pipe, and the exhaust pipe is connected to the secondary separation tank; a second fixed orifice plate and a water vapor separation plate installed on the second fixed orifice plate are provided in the secondary separation tank, and the water vapor separation plate is opposite to the outlet of the connecting pipe.

[0007] Furthermore, the water vapor separation plate includes a main plate surface and a ridge vertically mounted on the main plate surface, the ridge is in a broken line shape, and the side of the main plate surface provided with the ridge faces the outlet of the connecting pipe.

[0008] Furthermore, the axis of the guide column is parallel to the axis of the first-stage separation tank body, and the spiral inclination angle of the guide plate is 45°.

[0009] Furthermore, the guide column is cylindrical, each wall surface of the guide column is mesh-shaped, and the top of the guide column is fixed in the exhaust hole.

[0010] Furthermore, the breathing valve includes a preload spring and a valve cover. When the pressure inside the secondary separation tank is lower than the external air pressure, the valve cover is closed. When the pressure inside the secondary separation tank is higher than the external air pressure, the valve cover is opened.

[0011] Furthermore, the guide column and spiral plate are made of corrosion-resistant metal.

[0012] Furthermore, a maintenance window is provided on the side of the first-stage separation tank.

[0013] Furthermore, a drain valve is provided at the bottom of the first-stage separation tank.

[0014] The present invention also provides a method for using the microbubble separation device, which includes injecting water from the water inlet until the water level reaches the height of the water outlet, and always maintaining the water level no higher than the first fixed orifice plate.

[0015] Beneficial effects: Compared with the existing technology, the significant advantage of the present invention is that the microbubbles in seawater can be effectively separated through the coordinated cooperation of the guide column and the guide plate, thereby avoiding the corrosion of the hull by the microbubbles and improving the safety of the hull; the secondary separation tank can further separate the water vapor carried by the microbubbles to avoid the loss of ballast water. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the overall structure of the floating bridge microbubble separation device of the present invention;

[0017] Figure 2 Schematic diagram of the cross-sectional structure of the floating bridge microbubble separation device of the present invention;

[0018] Figure 3 This is a schematic structural diagram of the first fixed orifice plate of the present invention;

[0019] Figure 4 This is a schematic structural diagram of the guide column and guide plate of the present invention;

[0020] Figure 5 This is a schematic structural diagram of the water vapor separation plate of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the breathing valve of the present invention. DETAILED DESCRIPTION

[0022] like Figure 1 and Figure 2 As shown, a microbubble separation device for ship ballast water treatment in this embodiment includes a primary separation tank 4 and a secondary separation tank 10. The secondary separation tank 10 is arranged above the primary separation tank 4. The primary separation tank 4 and the secondary separation tank 10 are connected by a connecting pipe 6 and a reflux pipe 13.

[0023] A water inlet 1 is provided at the bottom of the side of the first-stage separation tank 4, and a water outlet 11 is provided at the upper side of the first-stage separation tank 4. A first fixed orifice plate 5 is provided inside the first-stage separation tank 4, and the first fixed orifice plate 5 is provided perpendicular to the axis of the tank body, and the height of the first fixed orifice plate 5 is higher than the water outlet 11. Figure 3 As shown, a plurality of exhaust holes 51 are provided on the first fixed orifice plate 5 , and an exhaust cavity is formed between the first fixed orifice plate 5 and the top of the primary separation tank 4 .

[0024] like Figure 4 As shown, a plurality of guide columns 3 are installed on the bottom surface of the first fixed orifice plate 5. The guide columns 3 are cylindrical with a hollow interior. The walls of the guide columns 3 are mesh-shaped. The upper ends of the guide columns 3 are open and fixed in the exhaust holes 51. The axis of the guide columns 3 is parallel to the axis of the first-stage separation tank 4. A guide plate 2 is spirally wound on the outer wall of the guide column 3, and the spiral inclination angle of the guide plate 2 is 45°. The guide column 3 and the spiral plate 2 are made of corrosion-resistant metal materials, such as stainless steel, aluminum alloy, etc., which can ensure that they will not deform in fast-flowing seawater and have the characteristics of resistance to seawater corrosion and bubble erosion.

[0025] A maintenance window 14 is provided on the side of the first-stage separation tank 4 to facilitate maintenance of the interior of the tank. A drain valve 12 is provided at the bottom of the first-stage separation tank 4 to discharge dirt in special circumstances such as maintenance.

[0026] A second fixed orifice plate 8 and a water vapor separation plate 7 mounted on the second fixed orifice plate 8 are provided in the secondary separation tank 10. A connecting pipe 6 is connected between the top of the primary separation tank 4 and the side wall of the secondary separation tank 10. A reflux pipe 13 is connected between the top of the primary separation tank 4 and the bottom of the secondary separation tank 10. An exhaust pipe 9 is provided on the upper side of the secondary separation tank 10.

[0027] like Figure 5 As shown, the water vapor separation plate 7 comprises a main plate 71 and multiple ridges 72 mounted perpendicularly to the main plate 71. The ridges 72 are in a broken line shape, forming a parallel arrowhead shape from the front. The side of the main plate 71 with the ridges 72 faces the outlet of the connecting pipe 6. A second fixed orifice plate 8 is fixed to the upper side of the secondary separation tank 10. The second fixed orifice plate 8 has air holes and is installed at a height lower than the exhaust pipe 9.

[0028] like Figure 6As shown, a breathing valve 15 is provided at the outlet of the exhaust pipe 9. The breathing valve 15 includes a preloaded spring 151 and a valve cover 152. When the pressure inside the secondary separation tank 10 is lower than the external air pressure, the valve cover closes. When the pressure inside the secondary separation tank 10 is higher than the external air pressure, the valve cover opens. The breathing valve ensures that the two connected separation tanks maintain sufficient water pressure, preventing seawater from entering the exhaust cavity of the primary separation tank and the secondary separation tank.

[0029] The working principle of the present invention is as follows: the ship's ballast water to be treated is injected from the water inlet 1 until the water level reaches the height of the water outlet 11, and the water level is always kept no higher than the first fixed orifice plate 5. After the seawater is injected, it flows from bottom to top. When passing through the guide column 3 and the guide plate 2, the guide column 3 can guide the seawater to flow upward along its wall. At the same time, the spiral structure of the guide plate 2 produces a rotating centrifugal effect on the gas-laden seawater flowing upward from the bottom of the tank body. Because the inertia of the bubbles is much lower than that of the seawater, under the action of centrifugal force, the seawater will tend to move away from the guide column 3, while the bubbles can flow into the interior of the guide column 3 through the mesh holes on the wall of the guide column 3, and then be discharged into the exhaust cavity through the upper end of the guide column 3 and the exhaust hole 51, and then enter the secondary separation tank 10 through the connecting pipe 6.

[0030] The secondary separation tank 10 is used to separate water vapor carried by bubbles. Gas discharged from the connecting pipe 6 is sprayed onto the water vapor separation plate 7. Due to its small molecular weight, the gas can flow along the curved path of the ridge 72 and then be discharged from the exhaust pipe through the air holes in the second fixed orifice plate 8. However, water droplets, due to their large mass and inertia, cannot change direction quickly and will collide with the ridge surface. After collision, the water droplets aggregate into larger droplets, which fall along the water vapor separation plate under the action of gravity and flow back into the separation tank through the return pipe 13, ultimately being discharged through the outlet.

[0031] The present invention provides a two-stage water vapor separation tank, which can effectively remove microbubbles in the ship's ballast water after micro-nano bubble treatment and sterilization, thereby preventing the seawater pump and the cabin from being corroded.

Claims

1. A microbubble separation device for ship ballast water treatment, characterized in that: The invention comprises a first-stage separation tank (4), wherein a water inlet (1) is provided at the bottom of the side of the first-stage separation tank (4), a water outlet (11) is provided at the upper part of the side of the first-stage separation tank (4), an exhaust pipe (9) is provided at the top of the first-stage separation tank (4), and a breathing valve (15) is provided at the outlet of the exhaust pipe (9); a first fixed orifice plate (5) is provided in the first-stage separation tank (4), the first fixed orifice plate (5) is arranged at a height higher than the water outlet (11), and an exhaust hole (51) is provided on the first fixed orifice plate (5); a guide column (3) is installed on the bottom surface of the first fixed orifice plate (5), the guide column (3) is hollow inside, each wall surface of the guide column (3) is provided with an air hole for air bubbles to pass through, and a guide plate (2) is spirally wound on the outer wall surface of the guide column (3).

2. The microbubble separation device according to claim 1, wherein The invention also includes a secondary separation tank (10) arranged above the primary separation tank (4); the primary separation tank (4) and the secondary separation tank (10) are connected via a connecting pipe (6) and a reflux pipe (13); and an exhaust pipe (9) is connected to the secondary separation tank (10); a second fixed orifice plate (8) and a water vapor separation plate (7) mounted on the second fixed orifice plate (8) are provided in the secondary separation tank (10); the water vapor separation plate (7) is directly opposite to the outlet of the connecting pipe (6).

3. The microbubble separation device according to claim 2, wherein: The water vapor separation plate (7) comprises a main plate surface (71) and a ridge (72) vertically mounted on the main plate surface (71); the ridge (72) is in a broken line shape; the main plate surface (71) has a side where the ridge (72) is located facing the outlet of the connecting pipe (6).

4. The microbubble separation device according to claim 1, wherein The axis of the guide column (3) is parallel to the axis of the tank body of the first-stage separation tank (4), and the spiral inclination angle of the guide plate (2) is 45°.

5. The microbubble separation device according to claim 1, wherein The guide column (3) is cylindrical, each wall surface of the guide column (3) is mesh-shaped, and the top of the guide column (3) is fixed in the exhaust hole.

6. The microbubble separation device according to claim 1, wherein The breathing valve (15) comprises a preload spring (151) and a valve cover (152). When the pressure inside the secondary separation tank (10) is lower than the external air pressure, the valve cover is closed. When the pressure inside the secondary separation tank (10) is higher than the external air pressure, the valve cover is opened.

7. The microbubble separation device according to claim 1, wherein The guide column (3) and the spiral plate (2) are made of corrosion-resistant metal.

8. The microbubble separation device according to claim 1, wherein A maintenance window (14) is provided on the side of the primary separation tank (4).

9. The microbubble separation device according to claim 1, wherein A sewage valve (12) is provided at the bottom of the primary separation tank (4).

10. A method for using the microbubble separation device according to any one of claims 1 to 9, characterized in that: Water is injected from the water inlet (1) until the water level reaches the height of the water outlet (11), and the water level is always kept no higher than the first fixed orifice plate (5).

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