Ballast water treatment system capable of removing hydrogen under pressure

Abstract

The invention provides an under-pressure hydrogen removal ballast water treatment system which comprises an electrolytic bath, a cyclone separator and an exhaust assembly, an outlet of the electrolytic bath is connected with an inlet of the cyclone separator, and a bottom outlet of the cyclone separator is used for being connected to a ballast water main pipeline; the exhaust assembly comprises a filler dehydrator, a drain valve, a water storage device and an exhaust pipeline; the filler dehydrator is arranged at a top outlet of the cyclone separator, an inlet of the drain valve is connected with the filler dehydrator, an outlet of the drain valve is connected with an inlet of the water storage device, and a top outlet of the water storage device is connected with the exhaust pipeline. And the bottom outlet of the water storage device is connected to the cyclone separator or a pipeline between the outlet of the electrolytic bath and the inlet of the cyclone separator or a pipeline between the bottom outlet of the cyclone separator and the ballast water main pipeline. According to the system, stable emission of separated hydrogen can be achieved, the problems of hydrogen building and the like are avoided, and the operation stability of the system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ships, and in particular to a pressurized hydrogen removal ballast water treatment system. Background Art

[0002] In the process of treating ship ballast water by branch electrolysis, a portion of hydrogen will be entrained in the sodium hypochlorite solution produced by electrolyzing seawater in the electrolytic cell (i.e., the electrolytic cell will simultaneously produce sodium hypochlorite and hydrogen when electrolyzing seawater). In order to remove the hydrogen in the sodium hypochlorite solution, a cyclone separator is currently used to separate the hydrogen in the sodium hypochlorite solution, and a gas-water separation valve is set at the top outlet of the cyclone separator. After the sodium hypochlorite solution entrained in the hydrogen is removed by the gas-water separation valve, the hydrogen is discharged; the sodium hypochlorite solution after hydrogen is separated is then injected into the ballast water pipeline to inactivate microorganisms.

[0003] However, in actual use, it is found that in the process of pressurized dehydrogenation, the hydrogen pressure discharged from the top outlet of the cyclone separator is often too high, resulting in the problem that the valve ball in the gas-water separation valve is dead and the outlet cannot be vented, causing the gas-water separation valve to hold back hydrogen, which not only affects the gas discharge in the cyclone separator, but may also cause damage to components such as the gas-water separation valve and the cyclone separator. Summary of the invention

[0004] The object of the present invention is to provide a pressurized hydrogen removal ballast water treatment system, which can achieve stable discharge of hydrogen after separation, avoid problems such as hydrogen holding back, and improve the operating stability of the system.

[0005] The present invention provides a ballast water treatment system for dehydrogenation under pressure, comprising an electrolyzer, a cyclone separator and an exhaust assembly, wherein the outlet of the electrolyzer is connected to the inlet of the cyclone separator, and the bottom outlet of the cyclone separator is used to be connected to the ballast water main pipeline;

[0006] The exhaust assembly includes a packing dehydrator, a discharge valve, a water reservoir and an exhaust pipeline; the packing dehydrator is arranged at the top outlet of the cyclone separator, the inlet of the discharge valve is connected to the packing dehydrator, the outlet of the discharge valve is connected to the inlet of the water reservoir, the top outlet of the water reservoir is connected to the exhaust pipeline, and the bottom outlet of the water reservoir is connected to the cyclone separator or the pipeline between the outlet of the electrolyzer and the inlet of the cyclone separator or the pipeline between the bottom outlet of the cyclone separator and the ballast water main pipeline.

[0007] Furthermore, the exhaust component also includes a fan, the outlet of the fan is connected to the exhaust pipeline; the exhaust pipeline is located above the top outlet of the water reservoir, and the connection part between the outlet of the fan and the exhaust pipeline is located above the top outlet of the water reservoir.

[0008] Furthermore, a connection portion between the outlet of the discharge valve and the inlet of the water reservoir is located below a connection portion between the outlet of the fan and the exhaust pipeline.

[0009] Furthermore, the outlet of the discharge valve is connected to the side inlet of the water reservoir through a first pipeline; the difference between the height of the connection part between the first pipeline and the side inlet of the water reservoir and the height of the connection part between the outlet of the fan and the exhaust pipeline is H, and the diameter of the first pipeline is D, H≥2D.

[0010] Furthermore, the outlet of the discharge valve is connected to the side inlet of the water reservoir through a first pipeline; the angle between the arrangement direction of the discharge valve and the horizontal direction is 0°~30°, and the height of the discharge valve close to one end of the water reservoir is greater than or equal to the height of the discharge valve away from one end of the water reservoir; the angle between the arrangement direction of the first pipeline and the horizontal direction is 0°~30°, and the height of the first pipeline close to one end of the water reservoir is greater than or equal to the height of the first pipeline away from one end of the water reservoir.

[0011] Furthermore, the cyclone separator is provided with a liquid level gauge, and the liquid level gauge is electrically connected to the discharge valve;

[0012] The discharge valve is an automatic regulating valve, and the opening of the automatic regulating valve can be adjusted according to the liquid level detected by the liquid level meter;

[0013] Alternatively, the discharge valve is a switch valve, and the switch valve can be adjusted to open or close according to the liquid level detected by the liquid level meter.

[0014] Furthermore, the inlet of the discharge valve is connected to the packing water separator through a second pipeline, and an orifice plate is provided on the second pipeline, and the orifice plate is used to reduce the flow rate of the fluid entering the discharge valve from the second pipeline.

[0015] Furthermore, the outlet of the electrolyzer is connected to the inlet of the cyclone separator through a third pipeline; the pressurized dehydrogenation ballast water treatment system also includes a compressed nitrogen pipeline, which is connected to the third pipeline; the compressed nitrogen pipeline is used to input compressed nitrogen into the electrolyte in the third pipeline, so that the compressed nitrogen absorbs the hydrogen in the electrolyte to form large bubbles, thereby facilitating the cyclone separator to separate the hydrogen in the electrolyte.

[0016] Furthermore, the input flow rate of the compressed nitrogen in the third pipeline is 1-10 times the flow rate of the hydrogen in the electrolyte.

[0017] Furthermore, a first check valve is provided on the bottom outlet pipeline of the water reservoir, and a second check valve is provided on the compressed nitrogen pipeline.

[0018] The pressurized dehydrogenation ballast water treatment system provided by the present invention is provided with an exhaust assembly, and the exhaust assembly includes a packing dehydrator, a discharge valve, a water reservoir and an exhaust pipeline. The exhaust valve is used to control the exhaust of the gas in the cyclone separator, and the packing dehydrator is first used to remove most of the liquid entrained in the gas, and then the water reservoir is used to remove the liquid entrained in the gas again. In the process of hydrogen discharge, part of the liquid in the exhaust pipeline will also flow back to the water reservoir, so that the discharged hydrogen is basically free of liquid to ensure the gas-liquid separation effect. At the same time, the liquid stored in the water reservoir can be discharged into the cyclone separator (or the inlet / outlet pipeline of the cyclone separator) through its bottom outlet to complete the discharge. The pressurized dehydrogenation ballast water treatment system can not only achieve the stable discharge of hydrogen after separation, but also does not need to use a gas-water separation valve, avoids the problem of hydrogen holding, and improves the operating stability of the system and the life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a ballast water treatment system for dehydrogenation under pressure in an embodiment of the present invention.

[0020] Figure 2 for Figure 1 Schematic diagram of the connection relationship between the exhaust assembly and the cyclone separator.

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the water reservoir.

[0022] Figure 4 Schematic diagram of the connection relationship between the exhaust assembly and the cyclone separator in another embodiment of the present invention.

[0023] Figure 5 for Figure 4 Schematic diagram of the structure of the mesoporous plate. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular sequence or order.

[0026] like Figures 1 to 3As shown, the pressurized dehydrogenation ballast water treatment system provided by the present invention includes an electrolyzer 1, a cyclone separator 2 and an exhaust assembly 3. The inlet of the electrolyzer 1 is used to connect to the seawater pipeline 6, and the electrolyzer 1 is used to electrolyze seawater (or salt water, etc.) to produce an electrolyte, and the electrolyte includes a sodium hypochlorite solution and hydrogen entrained in the sodium hypochlorite solution. The outlet of the electrolyzer 1 is connected to the inlet of the cyclone separator 2; the cyclone separator 2 is used to separate the electrolyte into gas and liquid, and the bottom outlet of the cyclone separator 2 is used to connect to the ballast water main line 4 to transport the separated sodium hypochlorite solution to the ballast water main line 4, and inactivate the ballast water in the ballast water main line 4. The exhaust assembly 3 is connected to the top outlet of the cyclone separator 2, and the exhaust assembly 3 is used to process the separated hydrogen to remove the liquid entrained in the hydrogen and then discharge the hydrogen.

[0027] The exhaust assembly 3 includes a packing dehydrator 36, a discharge valve 31, a water reservoir 32 and an exhaust pipeline 33; the packing dehydrator 36 is arranged at the top outlet of the cyclone separator 2, the inlet of the discharge valve 31 is connected to the outlet of the packing dehydrator 36, the outlet of the discharge valve 31 is connected to the inlet of the water reservoir 32, the top outlet of the water reservoir 32 is connected to the exhaust pipeline 33, and the bottom outlet of the water reservoir 32 is connected to the cyclone separator 2. Of course, in other embodiments, the bottom outlet of the water reservoir 32 can also be connected to the pipeline between the outlet of the electrolyzer 1 and the inlet of the cyclone separator 2 or the pipeline between the bottom outlet of the cyclone separator 2 and the ballast water main pipeline 4.

[0028] The pressurized dehydrogenation ballast water treatment system provided by the present invention is provided with an exhaust assembly 3, the exhaust assembly 3 includes a packing dehydrator 36, a discharge valve 31, a water reservoir 32 and an exhaust pipeline 33, and the exhaust valve 31 is used to control the exhaust of the gas in the cyclone separator 2, and the packing dehydrator 36 is used to remove most of the liquid entrained in the gas, and then the water reservoir 32 is used to remove the liquid entrained in the gas again, and in the process of hydrogen discharge, part of the liquid in the exhaust pipeline 33 (the liquid in the exhaust pipeline 33 is the liquid not removed by the water reservoir 32) will also flow back to the water reservoir 32, so that the discharged hydrogen is basically free of liquid to ensure the gas-liquid separation effect. At the same time, the liquid stored in the water reservoir 32 can be discharged into the cyclone separator 2 (or the inlet / outlet pipeline of the cyclone separator 2) through its bottom outlet to complete the discharge. The pressurized dehydrogenation ballast water treatment system can not only realize the stable discharge of hydrogen after separation, but also does not need to use a gas-water separation valve, avoids the problem of hydrogen holding, and improves the operating stability of the system and the life of the equipment.

[0029] Furthermore, if Figure 1As shown, in this embodiment, the exhaust assembly 3 further includes a fan 34, the outlet of the fan 34 is connected to the exhaust pipeline 33, and the fan 34 is used to dilute the hydrogen in the exhaust pipeline 33 to reduce the emission concentration of the hydrogen. Specifically, the fan 34 can pass air into the exhaust pipeline 33 when it is running. After the air and hydrogen are mixed in the exhaust pipeline 33, the concentration of hydrogen can be reduced, so that the concentration of hydrogen can be reduced to below the safe concentration, so as to improve the safety of hydrogen emission.

[0030] Furthermore, if Figures 1 to 3 As shown, in this embodiment, the exhaust pipe 33 is arranged vertically, and the exhaust pipe 33 is located above the top outlet of the water reservoir 32, so that the liquid in the exhaust pipe 33 can flow back to the water reservoir 32. Figure 2 The portion A) in the middle is located above the top outlet of the water reservoir 32, thereby preventing the liquid in the water reservoir 32 from entering the inside of the fan 34 through the exhaust pipe 33.

[0031] Furthermore, if Figures 1 to 3 As shown, in this embodiment, the connection portion between the outlet of the discharge valve 31 and the inlet of the water reservoir 32 (i.e. Figure 2 The portion B in the figure is located at the connection portion between the outlet of the fan 34 and the exhaust pipe 33 (i.e. Figure 2 Since the gas-liquid mixture discharged from the discharge valve 31 to the water reservoir 32 has a certain pressure, the connection part between the outlet of the discharge valve 31 and the inlet of the water reservoir 32 is set to be lower than the connection part between the outlet of the fan 34 and the exhaust pipe 33, so as to avoid the gas-liquid mixture discharged from the discharge valve 31 to the water reservoir 32 directly impacting and spraying into the inside of the fan 34 through the exhaust pipe 33.

[0032] Furthermore, if Figures 1 to 3 As shown, in this embodiment, the outlet of the discharge valve 31 is connected to the side inlet of the water reservoir 32 through the first pipeline 35, and the gas-liquid mixture discharged through the discharge valve 31 is sprayed onto the inner wall of the water reservoir 32 through the first pipeline 35, thereby realizing gas-liquid separation of the gas-liquid mixture in the water reservoir 32.

[0033] Furthermore, if Figures 1 to 3 As shown, in this embodiment, the connection portion between the first pipeline 35 and the side inlet of the water reservoir 32 (i.e. Figure 2 The difference between the height of the portion B in the middle and the height of the connection portion between the outlet of the fan 34 and the exhaust pipe 33 is H, and the diameter of the first pipe 35 is D, H≥2D. Generally, H is 2 to 3 times of D.

[0034] Furthermore, in this embodiment, the fan 34 is an explosion-proof fan, and the starting pressure of the fan 34 is 1000Pa to 4000Pa.

[0035] Furthermore, if Figure 1 As shown, in this embodiment, there are multiple fans 34 (two fans are shown in the figure), and the multiple fans 34 are arranged in parallel. The outlets of the multiple fans 34 are all connected to the exhaust pipeline 33 (specifically, the outlets of the multiple fans 34 are connected in parallel and then connected to the exhaust pipeline 33). A wind pressure switch 310 is provided on the pipeline between the outlet of the fan 34 and the exhaust pipeline 33, and the wind pressure switch 310 is connected to the fan 34 by electrical signals. The wind pressure switch 310 is used to detect the outlet pressure of the fan 34. When the outlet pressure of the fan 34 is too low, the standby fan 34 is switched and an alarm is issued.

[0036] Furthermore, if Figures 1 to 3 As shown, in this embodiment, the discharge valve 31 and the first pipeline 35 are both arranged horizontally or inclined. The angle between the arrangement direction of the discharge valve 31 (the arrangement direction of the discharge valve 31, i.e., the direction of the line connecting the inlet and the outlet of the discharge valve 31) and the horizontal direction is 0° to 30°, and the height of the discharge valve 31 close to the water reservoir 32 is greater than or equal to the height of the discharge valve 31 away from the water reservoir 32. That is, when the angle between the arrangement direction of the discharge valve 31 and the horizontal direction is 0°, the discharge valve 31 is arranged horizontally, and the height of the discharge valve 31 close to the water reservoir 32 is equal to the height of the discharge valve 31 away from the water reservoir 32; when the angle between the arrangement direction of the discharge valve 31 and the horizontal direction is greater than 0°, the discharge valve 31 is arranged inclined, and the height of the discharge valve 31 close to the water reservoir 32 is greater than the height of the discharge valve 31 away from the water reservoir 32.

[0037] The angle between the arrangement direction of the first pipeline 35 and the horizontal direction is 0° to 30°, and the height of the first pipeline 35 near the water reservoir 32 is greater than or equal to the height of the first pipeline 35 away from the water reservoir 32. That is, when the angle between the arrangement direction of the first pipeline 35 and the horizontal direction is 0°, the first pipeline 35 is arranged horizontally, and the height of the first pipeline 35 near the water reservoir 32 is equal to the height of the first pipeline 35 away from the water reservoir 32; when the angle between the arrangement direction of the first pipeline 35 and the horizontal direction is greater than 0°, the first pipeline 35 is arranged obliquely, and the height of the first pipeline 35 near the water reservoir 32 is greater than the height of the first pipeline 35 away from the water reservoir 32. Such an arrangement can enable the gas-liquid mixture to be smoothly discharged from the discharge valve 31 and the first pipeline 35 to the water reservoir 32, and avoid the accumulation of part of the liquid at the valve outlet during the discharge valve 31 opening and deflation process to cause exhaust noise.

[0038] Preferably, the discharge valve 31 and the first pipeline 35 are arranged obliquely ( Figure 3, the discharge valve 31 and the first pipeline 35 are both arranged at an angle, and the arrangement angles of the discharge valve 31 and the first pipeline 35 are the same. The angle between the arrangement direction of the discharge valve 31 and the horizontal direction is greater than 0° and less than or equal to 30°; or 5° to 15°; or 5° to 10°. The angle between the arrangement direction of the first pipeline 35 and the horizontal direction is greater than 0° and less than or equal to 30°; or 5° to 15°; or 5° to 10°. The angle between the arrangement direction of the discharge valve 31 and the horizontal direction is equal to the angle between the arrangement direction of the first pipeline 35 and the horizontal direction, that is, the arrangement direction of the discharge valve 31 is parallel to the arrangement direction of the first pipeline 35.

[0039] Furthermore, if Figure 1 As shown, in this embodiment, a first check valve 39 is provided on the bottom outlet pipeline of the water reservoir 32, that is, the bottom outlet of the water reservoir 32 is connected to the cyclone separator 2 (or the pipeline between the outlet of the electrolytic cell 1 and the inlet of the cyclone separator 2 or the pipeline between the bottom outlet of the cyclone separator 2 and the ballast water main pipeline 4) through the first check valve 39, so as to prevent the liquid in the cyclone separator 2 or the pipeline from flowing into the water reservoir 32 under pressure. It should be noted that the setting position of the first check valve 39 needs to ensure that the height difference of the liquid level from the bottom of the water reservoir 32 to the first check valve 39 can open the first check valve 39.

[0040] Furthermore, if Figure 1 As shown, in this embodiment, a liquid level meter 21 is provided on the cyclone separator 2, and the liquid level meter 21 is used to detect the liquid level height of the sodium hypochlorite solution in the cyclone separator 2, and the liquid level meter 21 is electrically connected to the discharge valve 31. In this embodiment, the discharge valve 31 is an automatic regulating valve, and the liquid level meter 21 is electrically connected to the automatic regulating valve. The automatic regulating valve can adjust its opening according to the liquid level height detected by the liquid level meter 21, so as to maintain the stability of the liquid level in the cyclone separator 2, and ensure the stability of the exhaust, and then ensure the operation stability of the system. Specifically, when the liquid level height detected by the liquid level meter 21 is too high (for example, higher than the upper limit of the set range), the automatic regulating valve reduces its opening to reduce the discharge flow rate of hydrogen; when the liquid level height detected by the liquid level meter 21 is too low (for example, lower than the lower limit of the set range), the automatic regulating valve increases its opening to increase the discharge flow rate of hydrogen.

[0041] like Figure 4As shown, in another embodiment, the discharge valve 31 is a switch valve, the liquid level meter 21 is connected to the switch valve by electrical signals, and the switch valve can adjust its opening and closing according to the liquid level height detected by the liquid level meter 21. Specifically, when the liquid level height detected by the liquid level meter 21 is too high (for example, higher than the upper limit of the set range), the switch valve is closed to stop the discharge of hydrogen; when the liquid level height detected by the liquid level meter 21 is too low (for example, lower than the lower limit of the set range), the switch valve is opened to discharge hydrogen. Such a setting can also maintain the stability of the liquid level in the cyclone separator 2; at the same time, the cost of the switch valve is lower than that of the automatic regulating valve, but the operating reliability of the switch valve is higher than that of the automatic regulating valve.

[0042] Furthermore, in this embodiment, the liquid level meter 21 is provided with at least four alarm points, including a low-low liquid level alarm, a low liquid level alarm, a high liquid level alarm and a high-high liquid level alarm.

[0043] like Figure 4 As shown, in another embodiment, the inlet of the discharge valve 31 is connected to the packing dehydrator 36 through the second pipeline 37, and the second pipeline 37 is provided with an orifice plate 38, which is used to reduce the fluid flow rate of the second pipeline 37 entering the discharge valve 31 (that is, to reduce the fluid flow rate in the second pipeline 37). By setting the orifice plate 38, the orifice plate 38 can reduce the exhaust flow rate of the second pipeline 37, which can be beneficial to the flow control of the gas under a small flow rate, that is, to improve the flow control accuracy of the gas under a small flow rate, and on the other hand, it is beneficial to ensure the stability of the exhaust, and can reduce the impact of the pressurized gas on the subsequent components (including the discharge valve 31, the water reservoir 32, etc.), and improve the service life of the components. At the same time, the orifice plate 38 is generally used in conjunction with the switch valve (that is, the discharge valve 31 is a switch valve), so that when the switch valve is opened (the switch valve can generally only be opened 100%, and the opening cannot be adjusted), it can be exhausted at a small flow rate. Of course, the orifice plate 38 can also be used in conjunction with the automatic regulating valve (that is, the discharge valve 31 is an automatic regulating valve).

[0044] Specifically, Figure 4 and Figure 5 As shown, the orifice plate 38 is provided with a through hole 381, the number of the through hole 381 is one or more (shown as one in the figure, the one through hole 381 is arranged at the center of the orifice plate 38), and the through hole 381 is connected with the inner cavity of the second pipeline 37. The diameter of the through hole 381 is smaller than the inner diameter of the second pipeline 37, that is, the area of ​​the through hole 381 is smaller than the cross-sectional area of ​​the second pipeline 37, so that the orifice plate 38 can play a role in reducing the flow. At the same time, by selecting the orifice plate 38 with different sizes of through holes 381, the fluid flow in the second pipeline 37 can be changed.

[0045] Furthermore, if Figure 1 and Figure 2As shown, in this embodiment, the outlet of the electrolyzer 1 is connected to the inlet of the cyclone separator 2 through the third pipeline 11. The pressurized dehydrogenation ballast water treatment system also includes a compressed nitrogen pipeline 5 (the compressed nitrogen pipeline 5 is generally an existing device on the ship and does not need to be additionally set up), and the compressed nitrogen pipeline 5 is connected to the third pipeline 11; the compressed nitrogen pipeline 5 is used to input compressed nitrogen into the electrolyte in the third pipeline 11, so that the compressed nitrogen absorbs the hydrogen in the electrolyte to form large bubbles, thereby facilitating the cyclone separator 2 to separate the hydrogen in the electrolyte.

[0046] Specifically, since the hydrogen in the electrolyte is mixed in the sodium hypochlorite solution in the form of small bubbles, it is not easy to be separated in the cyclone separator 2; by introducing compressed nitrogen into the third pipeline 11, through the principle of gas diffusion (gas diffusion refers to the movement of certain gas molecules into other gases through diffusion), the compressed nitrogen can absorb the hydrogen in the electrolyte and form large bubbles after mixing with the electrolyte, thereby facilitating the subsequent gas-liquid separation in the cyclone separator 2 and improving the gas-liquid separation efficiency. The separated nitrogen will be discharged through the exhaust pipeline 33 together with the hydrogen, and the discharged nitrogen will not pollute the atmospheric environment.

[0047] Further, in this embodiment, the input flow rate of the compressed nitrogen in the third pipeline 11 (i.e., the flow rate of the compressed nitrogen input from the compressed nitrogen pipeline 5 to the third pipeline 11) is 1-10 times the flow rate of hydrogen in the electrolyte (i.e., the hydrogen production of the system). For example, if the flow rate of the electrolyte is 1L / min, and the hydrogen content in the electrolyte is 0.1L / L (i.e., 1L of electrolyte contains 0.1L of hydrogen), then the flow rate of hydrogen in the electrolyte is 0.1L / min, and the input flow rate of the compressed nitrogen in the third pipeline 11 is 0.1L / min to 1L / min. By limiting the input flow rate of compressed nitrogen, the hydrogen precipitation effect can be guaranteed while avoiding the waste of nitrogen and the danger caused by excessive nitrogen concentration (if the input flow rate of compressed nitrogen is too low, the absorption effect of hydrogen will be poor, affecting the hydrogen precipitation effect; if the input flow rate of compressed nitrogen is too high, it will not only cause nitrogen waste, but also increase the workload of the cyclone separator 2, and there may be danger due to the excessively high concentration of nitrogen finally discharged. By controlling the input flow rate of compressed nitrogen within a reasonable range, the nitrogen can be discharged after reaching a safe concentration after being diluted by the fan 34).

[0048] Furthermore, in this embodiment, the pressure of the compressed nitrogen is greater than the pressure of the electrolyte in the third pipeline 11, so that the compressed nitrogen in the compressed nitrogen pipeline 5 can smoothly flow into the third pipeline 11 and mix with the electrolyte; the pressure of the compressed nitrogen is generally 3 to 7 bar.

[0049] Furthermore, if Figure 1 and Figure 2As shown, in this embodiment, a flow regulating valve 52 and a first flow meter 53 are provided on the compressed nitrogen pipeline 5. The flow regulating valve 52 can be a pneumatic regulating valve. The flow regulating valve 52 cooperates with the first flow meter 53 to control the input flow of the compressed nitrogen.

[0050] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, a second check valve 51 is further provided on the compressed nitrogen pipeline 5 , and the second check valve 51 is used to prevent the electrolyte in the third pipeline 11 from flowing into the compressed nitrogen pipeline 5 .

[0051] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, a water inlet pipe 22 is provided at the side inlet of the cyclone separator 2, and the outlet of the electrolytic cell 1 is connected to the water inlet pipe 22. The water inlet pipe 22 is tangent to the side wall of the cylinder of the cyclone separator 2, so that the electrolyte can form a vortex after entering the cyclone separator 2 to accelerate the gas-liquid separation.

[0052] Furthermore, in the present embodiment, the packing dehydrator 36 is a packing structure, and the packing in the packing dehydrator 36 may be a perforated plate corrugated packing, a wire mesh corrugated packing, or the like.

[0053] Furthermore, if Figure 1 As shown, in this embodiment, a second flow meter 14, a pressure sensor 13 and a conductivity meter 15 are provided on the seawater pipeline 6. The second flow meter 14 is used to detect the flow rate of seawater in the seawater pipeline 6, the pressure sensor 13 is used to detect the pressure of seawater in the seawater pipeline 6, and the conductivity meter 15 is used to detect the conductivity of seawater in the seawater pipeline 6.

[0054] Furthermore, if Figure 1 As shown, in this embodiment, a temperature sensor 12 is provided on the pipeline between the outlet of the electrolytic cell 1 and the inlet of the cyclone separator 2 for detecting the temperature of the electrolyte.

[0055] Furthermore, in this embodiment, the hydrogen production of the system is 2.5%-20% of the incoming water flow (i.e., the seawater flow in the seawater pipeline 6), the design pressure of the system is 2bar-7bar, and the gas flow rate in the exhaust pipeline 33 is 0.5-15m / s.

[0056] Furthermore, if Figures 1 to 3 As shown, in this embodiment, the working principle of the pressurized hydrogen removal ballast water treatment system is:

[0057] The pressurized seawater in the seawater pipeline 6 enters the electrolytic cell 1, and the electrolytic cell 1 electrolyzes the seawater to generate an electrolyte. The electrolyte includes a sodium hypochlorite solution and hydrogen entrained in the sodium hypochlorite solution.

[0058] The compressed nitrogen pipeline 5 introduces compressed nitrogen into the electrolyte, and the compressed nitrogen absorbs the hydrogen in the electrolyte to form large bubbles, thereby obtaining a mixed solution of hydrogen, nitrogen and sodium hypochlorite solution.

[0059] The mixed liquid enters the cyclone separator 2 to form a cyclone flow. Under the action of centrifugal force, hydrogen and nitrogen are precipitated and accumulated at the top of the cyclone separator 2, and part of the sodium hypochlorite solution is entrained in the hydrogen and nitrogen to form a gas-liquid mixture; the sodium hypochlorite solution accumulates at the bottom of the cyclone separator 2 and is transported to the ballast water main line 4 through the bottom outlet of the cyclone separator 2 to inactivate microorganisms in the ballast water in the ballast water main line 4.

[0060] The gas-liquid mixture first passes through the packing dehydrator 36 at the top outlet of the cyclone separator 2 for gas-water separation to remove most of the liquid, and then the gas-liquid mixture enters the water reservoir 32 after passing through the discharge valve 31; by adjusting the valve opening of the discharge valve 31, the amount of hydrogen discharged in the exhaust pipe 33 can be kept equal to the amount of hydrogen produced by the electrolyzer 1, thereby ensuring that the liquid level in the cyclone separator 2 is stable within a certain range. After the gas-liquid mixture enters the water reservoir 32, most of the liquid in the gas-liquid mixture will be retained in the water reservoir 32, and a small amount of liquid entering the exhaust pipe 33 will also flow back to the water reservoir 32 to prevent the liquid from accumulating in the exhaust pipe 33 and entering the fan 34. The hydrogen and nitrogen separated from the gas-liquid mixture are diluted to below the safe concentration by the fan 34 and then discharged through the exhaust pipe 33. When the system stops running, the water in the water reservoir 32 will open the first check valve 39 by gravity after the system is depressurized and flow into the cyclone separator 2 (or the inlet / outlet pipeline of the cyclone separator 2) to complete the discharge.

[0061] The above technology can realize that the sodium hypochlorite solution produced after the electrolysis device removes hydrogen can be directly injected into the ballast water main line 4 under pressure, without the need for an additional dosing pump for pressurized injection.

[0062] An embodiment of the present invention further provides a ship, comprising the above-mentioned pressurized hydrogen removal ballast water treatment system.

[0063] The pressurized dehydrogenation ballast water treatment system provided by the embodiment of the present invention is provided with an exhaust assembly 3, the exhaust assembly 3 includes a packing dehydrator 36, a discharge valve 31, a water reservoir 32 and an exhaust pipeline 33, and the exhaust valve 31 is used to control the exhaust of the gas in the cyclone separator 2, and the packing dehydrator 36 is used to remove most of the liquid entrained in the gas, and then the water reservoir 32 is used to remove the liquid entrained in the gas again, and in the process of hydrogen discharge, part of the liquid in the exhaust pipeline 33 will also flow back to the water reservoir 32, so that the discharged hydrogen is basically free of liquid to ensure the gas-liquid separation effect. At the same time, the liquid stored in the water reservoir 32 can be discharged into the cyclone separator 2 (or the inlet / outlet pipeline of the cyclone separator 2) through its bottom outlet to complete the discharge. The pressurized dehydrogenation ballast water treatment system can not only realize the stable discharge of hydrogen after separation, but also does not need to use a gas-water separation valve, avoids the problem of hydrogen holding, and improves the operating stability of the system and the life of the equipment.

[0064] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A ballast water treatment system for dehydrogenation under pressure, characterized in that: It comprises an electrolytic cell (1), a cyclone separator (2) and an exhaust assembly (3), wherein the outlet of the electrolytic cell (1) is connected to the inlet of the cyclone separator (2), and the bottom outlet of the cyclone separator (2) is used to be connected to a ballast water main pipeline (4); The exhaust assembly (3) comprises a packing dehydrator (36), a discharge valve (31), a water reservoir (32) and an exhaust pipeline (33); the packing dehydrator (36) is arranged at the top outlet of the cyclone separator (2), the inlet of the discharge valve (31) is connected to the packing dehydrator (36), the outlet of the discharge valve (31) is connected to the inlet of the water reservoir (32), the top outlet of the water reservoir (32) is connected to the exhaust pipeline (33), and the bottom outlet of the water reservoir (32) is connected to the pipeline between the outlet of the cyclone separator (2) or the electrolytic cell (1) and the inlet of the cyclone separator (2) or the pipeline between the bottom outlet of the cyclone separator (2) and the ballast water main pipeline (4).

2. The pressurized dehydrogenation ballast water treatment system according to claim 1, characterized in that: The exhaust assembly (3) further comprises a fan (34), the outlet of the fan (34) being connected to the exhaust pipeline (33); the exhaust pipeline (33) being located above the top outlet of the water reservoir (32), and the connection portion between the outlet of the fan (34) and the exhaust pipeline (33) being located above the top outlet of the water reservoir (32).

3. The pressurized dehydrogenation ballast water treatment system according to claim 2, characterized in that: The connection point between the outlet of the discharge valve (31) and the inlet of the water reservoir (32) is located below the connection point between the outlet of the fan (34) and the exhaust pipeline (33).

4. The pressurized dehydrogenation ballast water treatment system according to claim 3, characterized in that: The outlet of the discharge valve (31) is connected to the side inlet of the water reservoir (32) through a first pipeline (35); the difference between the height of the connection part between the first pipeline (35) and the side inlet of the water reservoir (32) and the height of the connection part between the outlet of the fan (34) and the exhaust pipeline (33) is H, and the diameter of the first pipeline (35) is D, H≥2D.

5. The pressurized dehydrogenation ballast water treatment system according to claim 1, characterized in that: The outlet of the discharge valve (31) is connected to the side inlet of the water reservoir (32) through a first pipeline (35); the angle between the arrangement direction of the discharge valve (31) and the horizontal direction is 0° to 30°, and the height of the discharge valve (31) close to the water reservoir (32) is greater than or equal to the height of the discharge valve (31) away from the water reservoir (32); the angle between the arrangement direction of the first pipeline (35) and the horizontal direction is 0° to 30°, and the height of the first pipeline (35) close to the water reservoir (32) is greater than or equal to the height of the first pipeline (35) away from the water reservoir (32).

6. The pressurized dehydrogenation ballast water treatment system according to claim 1, characterized in that: The cyclone separator (2) is provided with a liquid level meter (21), and the liquid level meter (21) is electrically connected to the discharge valve (31); The discharge valve (31) is an automatic regulating valve, and the automatic regulating valve can adjust its opening according to the liquid level detected by the liquid level meter (21); Alternatively, the discharge valve (31) is an on-off valve, and the on-off valve can be adjusted to open or close according to the liquid level detected by the liquid level meter (21).

7. The pressurized dehydrogenation ballast water treatment system according to claim 1, characterized in that: The inlet of the discharge valve (31) is connected to the packing water separator (36) through a second pipeline (37). An orifice plate (38) is provided on the second pipeline (37). The orifice plate (38) is used to reduce the flow rate of the fluid entering the discharge valve (31) from the second pipeline (37).

8. The pressurized dehydrogenation ballast water treatment system according to any one of claims 1 to 7, characterized in that: The outlet of the electrolytic cell (1) is connected to the inlet of the cyclone separator (2) via a third pipeline (11); the pressurized dehydrogenation ballast water treatment system further comprises a compressed nitrogen pipeline (5), wherein the compressed nitrogen pipeline (5) is connected to the third pipeline (11); the compressed nitrogen pipeline (5) is used to input compressed nitrogen into the electrolyte in the third pipeline (11), so that the compressed nitrogen absorbs the hydrogen in the electrolyte to form large bubbles, thereby facilitating the cyclone separator (2) to separate the hydrogen in the electrolyte.

9. The pressurized dehydrogenation ballast water treatment system according to claim 8, characterized in that: The input flow rate of the compressed nitrogen in the third pipeline (11) is 1-10 times the flow rate of the hydrogen in the electrolyte.

10. The pressurized hydrogen removal ballast water treatment system according to claim 8, characterized in that: A first check valve (39) is provided on the bottom outlet pipeline of the water reservoir (32), and a second check valve (51) is provided on the compressed nitrogen pipeline (5).

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