A device for recycling inert gas in a very large crude carrier

Abstract

The utility model relates to a kind of super large oil tanker internal inert gas recycling device in the field of ship engineering, including tank body, the upper end of one side of tank body is fixedly connected with suction pipe, the lower end of one side of tank body is fixedly connected with exhaust pipe, the gas outlet of exhaust pipe is connected with the suction port of outside air pump, further include: annular plate, set in tank body interior, and with the inner wall of tank body slidingly adheres;Gas-permeable liquid-impermeable membrane is arranged in arc, and is fixedly connected on annular plate;Motor is installed in the upper end of tank body;Driving shaft is fixedly connected in the output end of motor;Using above structure, oil can be intercepted accurately, let inert gas pass through smoothly, realize oil gas effective separation, oil content in inert gas after separation is greatly reduced, provide high-purity gas source for subsequent recycling, solve the problem of traditional device oil gas mixing interference.

Description

Technical Field

[0001] This utility model relates to a recycling device, and more particularly to an inert gas recycling device for a very large oil tanker, which is applied in the field of marine engineering technology. Background Technology

[0002] During crude oil transportation and loading / unloading operations on Very Large Crude Carriers (VLCCs), in order to prevent the formation of an explosive environment by mixing oil and air in the oil tanks, it is usually necessary to fill the oil tanks with inert gases (such as nitrogen or flue gas with an oxygen content of less than 8%) to reduce the oxygen concentration. Traditional inert gas supply systems mostly use flue gas generated by boiler combustion, which is treated before being injected into the oil tanks. However, since the amount of flue gas emitted by boilers is usually greater than the actual amount of inert gas required, the direct emission of excess flue gas will release a large amount of air pollutants, causing environmental pollution. Therefore, it is necessary to install gas recovery devices to reduce environmental pollution.

[0003] However, in practical applications of existing inert gas recycling devices for very large crude carriers, when recovering excess gas from the oil tanks, oil and inert gas are collected together. This results in the recovered mixed gas containing a large amount of volatile organic compounds (VOCs) and oil mist particles. This mixed state of oil and gas not only reduces the purity of the inert gas and affects its reuse effect (such as reducing the inerting efficiency of the oil tanks), but may also cause blockage or corrosion of subsequent processing equipment (such as compressors and filters), shortening the service life of the equipment. In view of this, this utility model is proposed. Summary of the Invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by this utility model is how to solve the problem of oil-gas mixing affecting subsequent use.

[0005] To address the aforementioned problems, this utility model provides an inert gas recycling device for ultra-large oil tankers, comprising a tank body, an exhaust pipe fixedly connected to the upper end of one side of the tank body, and an exhaust pipe fixedly connected to the lower end of one side of the tank body. The exhaust pipe's outlet is connected to the exhaust port of an external air pump. The device also includes: an annular plate disposed inside the tank body and slidingly attached to the inner wall of the tank body; an arc-shaped, air-permeable but liquid-permeable membrane fixedly connected to the annular plate; a motor mounted on the upper end of the tank body; and a drive shaft fixedly connected to the motor's output end. One end of the drive shaft extending downward into the tank body is fixedly connected to the annular plate via a connecting rod, and the upper end of the air-permeable but liquid-permeable membrane is fixedly connected to the drive shaft.

[0006] In the aforementioned inert gas recycling device inside the supertanker, the physical properties of a breathable but liquid-impermeable film are used to precisely intercept oil, allowing inert gas to pass through smoothly, thus achieving effective oil-gas separation. After separation, the residual oil content in the inert gas is significantly reduced, providing a high-purity gas source for subsequent recycling and solving the problem of oil-gas mixing interference in traditional devices.

[0007] To facilitate oil collection, as a further improvement of this application, an annular oil collection box is provided between the inner wall of the tank and the annular plate. The annular oil collection box is fixedly connected to the inner wall of the tank. The outer wall of the annular plate slides against the inner wall of the annular oil collection box. An oil drain valve pipe is fixedly connected to one side of the lower end of the annular oil collection box. The oil outlet end of the oil drain valve pipe extends obliquely downward out of the tank.

[0008] To facilitate the full flow of oil into the annular oil collecting box, as a further improvement of this application, a guide inclined ring is fixedly connected to the upper end of the annular oil collecting box near the inner wall of the tank, and an arc-shaped chamfer is provided at the upper end of the annular oil collecting box near the annular plate.

[0009] To facilitate reducing the motor load, as a further improvement of this application, multiple blades are fixedly connected in a circular pattern at equal intervals near the exhaust pipe on the drive shaft. The surface of the blades is provided with an oil-repellent layer, and the exhaust pipe outlet faces the blades.

[0010] To facilitate the replacement of the air-permeable but liquid-permeable membrane, as a further improvement of this application, a can lid is also included, which is threadedly connected to the can opening at the upper end of the can body, and the motor is fixedly connected to the can lid.

[0011] To facilitate rotating the can lid, as a further improvement of this application, a rotating handle is fixedly connected to one side of the can lid via a support rod.

[0012] In summary, compared with existing technologies, the inert gas recycling device inside this supertanker utilizes the physical properties of a breathable but liquid-impermeable film to precisely intercept oil, allowing inert gas to pass through smoothly, thus achieving effective oil-gas separation. The residual oil content in the separated inert gas is significantly reduced, providing a high-purity gas source for subsequent recycling and solving the problem of oil-gas mixing interference in traditional devices.

[0013] The motor drives the air-permeable but liquid-permeable membrane to rotate, generating centrifugal force to promptly clean the oil and water adhering to the membrane surface and prevent membrane pore blockage. Compared with traditional devices that are prone to decreased separation and recovery efficiency due to membrane blockage, this device can maintain a high recovery efficiency for a long time, ensuring continuous and smooth recovery of inert gas and effectively extending the cleaning and replacement cycle of the air-permeable but liquid-permeable membrane.

[0014] The recovered inert gas has high purity and few impurities. When it is refilled into the oil tank for operations such as suppressing oil and gas explosions, it can perform better and ensure the safety of oil tanker operations. At the same time, it reduces potential problems such as equipment corrosion caused by impure gas, and improves the reliability and economy of the entire inert gas recycling system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0016] Figure 2 This is a schematic diagram of the internal structure of the tank according to an embodiment of this application;

[0017] Figure 3 This is a cross-sectional structural diagram of an embodiment of this application.

[0018] Explanation of the labels in the diagram:

[0019] 1. Tank body; 101. Suction pipe; 102. Exhaust pipe; 2. Tank cover; 201. Rotating handle; 202. Motor; 203. Drive shaft; 204. Annular plate; 205. Connecting rod; 206. Air-permeable but liquid-impermeable film; 207. Blade; 3. Annular oil collection box; 301. Oil discharge valve pipe; 302. Flow guide inclined ring. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0021] Implementation method:

[0022] Figures 1-3 The diagram illustrates an inert gas recycling device for a very large oil tanker, comprising a tank body 1, with an extraction pipe 101 fixedly connected to the upper end of one side of the tank body 1 and an exhaust pipe 102 fixedly connected to the lower end of one side of the tank body 1. The outlet of the exhaust pipe 102 is connected to the extraction port of an external air pump. The device also includes: an annular plate 204 disposed inside the tank body 1 and slidingly attached to the inner wall of the tank body 1; an arc-shaped, air-permeable but liquid-permeable membrane 206 fixedly connected to the annular plate 204; a motor 202 mounted on the upper end of the tank body 1; and a drive shaft 203 fixedly connected to the output end of the motor 202. One end of the drive shaft 203 extending downward into the tank body 1 is fixedly connected to the annular plate 204 via a connecting rod 205. The upper end of the air-permeable but liquid-permeable membrane 206 is fixedly connected to the drive shaft 203.

[0023] Before use, first connect the exhaust port of the device's exhaust pipe 102 to the external air pump's suction port (the air pump is connected to an external air storage tank), and connect the suction port of the suction pipe 101 to the oil tank. The oil tank is equipped with a pressure sensor (this is existing technology, used to monitor the amount of inert gas).

[0024] When the pressure sensor in the oil tank detects a large amount of inert gas (which needs to be recovered), the air pump is started. The air pump draws in the gas, creating a negative pressure inside the tank 1. The excess oil-gas mixture in the oil tank is drawn into the tank 1 through the suction pipe 101. After entering the tank 1, the oil-gas mixture flows through the air-permeable but liquid-impermeable membrane 206. Due to the air-permeable but liquid-impermeable properties of the membrane, the inert gas can pass through the membrane and flow out, while the oil is intercepted, thus achieving oil-gas separation.

[0025] At the same time, the motor 202 is started synchronously. The output end of the motor 202 drives the shaft 203 to rotate, which drives the annular plate 204 and the air-permeable but liquid-permeable membrane 206 fixed on it to rotate through the connecting rod 205, generating centrifugal force to throw off the oil and water attached to the membrane, avoid membrane pore blockage, and continuously ensure the smoothness of gas discharge and separation effect.

[0026] After separation and cleaning, the inert gas passes through the air-permeable but liquid-impermeable membrane 206 under the suction of the air pump, and is finally drawn into the external gas storage tank through the exhaust pipe 102 to complete the recovery for subsequent recycling.

[0027] This device utilizes the physical properties of the air-permeable but liquid-impermeable membrane 206 to precisely intercept oil while allowing inert gas to pass through smoothly, achieving effective oil-gas separation. After separation, the residual oil content in the inert gas is significantly reduced, providing a high-purity gas source for subsequent recycling and solving the problem of oil-gas mixing interference in traditional devices.

[0028] Motor 202 drives the air-permeable but liquid-permeable membrane 206 to rotate, generating centrifugal force to promptly clean the oil and water adhering to the membrane surface and prevent membrane pore blockage. Compared with traditional devices that are prone to decreased separation and recovery efficiency due to membrane blockage, this device can maintain a high recovery efficiency for a long time, ensuring continuous and smooth recovery of inert gas and effectively extending the cleaning and replacement cycle of the air-permeable but liquid-permeable membrane 206.

[0029] The recovered inert gas has high purity and few impurities. When it is refilled into the oil tank for operations such as suppressing oil and gas explosions, it can perform better and ensure the safety of oil tanker operations. At the same time, it reduces potential problems such as equipment corrosion caused by impure gas, and improves the reliability and economy of the entire inert gas recycling system.

[0030] Figures 1-3 As shown, an annular oil collection box 3 is provided between the inner wall of the tank 1 and the annular plate 204. The annular oil collection box 3 is fixedly connected to the inner wall of the tank 1. The outer wall of the annular plate 204 slides against the inner wall of the annular oil collection box 3. An oil drain valve pipe 301 is fixedly connected to one side of the lower end of the annular oil collection box 3. The oil outlet end of the oil drain valve pipe 301 extends obliquely downward out of the tank 1. With the help of the annular oil collection box 3, the oil that is rotated and intercepted by the air-permeable but liquid-permeable membrane 206 can be accurately collected and gathered, avoiding the oil from flowing randomly in the tank 1 and contaminating the tank 1 or affecting gas separation. The oil drain valve pipe 301 extends obliquely downward out of the tank 1, which can use gravity to achieve convenient discharge of oil. With the help of valve control, oil can be discharged periodically as needed, which not only ensures the orderly collection of oil, but also maintains the stability of the oil-gas separation environment in the tank 1, improves the processing efficiency and cleanliness of the oil in the oil-gas mixture, and ensures the continuous and efficient recovery of inert gas.

[0031] A flow-guiding inclined ring 302 is fixedly connected to the upper end of the annular oil collecting box 3 near the inner wall of the tank body 1. An arc-shaped chamfer is provided at the upper end of the annular oil collecting box 3 near the annular plate 204. The flow-guiding inclined ring 302 can guide the oil that is thrown off by the air-permeable but liquid-permeable film 206 to flow quickly into the oil collecting box along the inclined surface, avoiding oil splashing and retention. The arc-shaped chamfer near the annular plate 204 can eliminate the obstruction caused by the right angle structure, guide the oil to converge, reduce the accumulation of oil in the gaps, improve the oil collection efficiency, and also reduce the impact of oil splashing on the mating part of the annular plate 204 and the oil collecting box, enhance the stability and service life of the device, and ensure the continuous and efficient operation of oil-gas separation and inert gas recovery.

[0032] Figures 1-3 As shown, multiple blades 207 are fixedly connected in a circular pattern at equal intervals on the drive shaft 203 near the exhaust pipe 101. The surface of the blades 207 is provided with an oleophobic layer, and the exhaust port of the exhaust pipe 101 faces the blades 207.

[0033] When the oil-gas mixture in the oil tank enters the tank 1 through the extraction pipe 101, the airflow impacts the blade 207. Because the blade 207 can rotate due to the airflow, it can convert the kinetic energy of the airflow into the rotational power of the drive shaft 203, providing additional power assistance to the drive shaft 203, reducing the drive load of the motor 202, reducing the energy consumption and operating load of the motor 202, and helping the device to operate more energy-efficiently and efficiently. At the same time, the oleophobic layer on the surface of the blade 207 can reduce oil adhesion, maintain the aerodynamic performance of the blade 207, ensure the stability and continuity of power assistance, and synergistically improve the energy efficiency of the inert gas recovery process.

[0034] Figures 1-3 As shown, it also includes a can lid 2, which is threaded to the can opening at the upper end of the can body 1. The motor 202 is fixedly connected to the can lid 2. When it is necessary to remove and replace the air-permeable but liquid-permeable membrane 206, simply rotate the can lid 2 to separate it from the can body 1. The motor 202 will then be removed along with the can lid 2. The annular plate 204 and the air-permeable but liquid-permeable membrane 206, which are connected to the motor 202 through the drive shaft 203 and the connecting rod 205, will also be taken out of the can body 1. There is no need to disassemble the complex connection structure, which greatly simplifies the removal and replacement operation of the air-permeable but liquid-permeable membrane 206, saves maintenance time and labor costs, and ensures that the device can quickly return to a high-efficiency operating state.

[0035] A rotating handle 201 is fixedly connected to one side of the can lid 2 via a support rod. The rotating handle 201 is fixed to the outside of the can lid 2 via the support rod, which provides a convenient point of force for opening the can lid 2. When it is necessary to open the can lid 2 to replace the air-permeable but liquid-permeable membrane 206, the operator can directly hold the rotating handle 201 and apply rotational force more effortlessly to easily drive the can lid 2 to rotate along the threaded structure. This avoids the slippage or inconvenience of applying force that may occur when directly holding the can lid 2, significantly improving the convenience of opening the can lid 2 and further shortening the maintenance operation time.

[0036] It should be noted that any content not described in detail in this specification is prior art known to those skilled in the art.

[0037] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A device for recycling inert gas in a very large crude carrier, comprising a tank body (1), a gas suction pipe (101) being fixedly connected to an upper end of one side of the tank body (1), a gas discharge pipe (102) being fixedly connected to a lower end of the one side of the tank body (1), and a gas outlet of the gas discharge pipe (102) being connected to a gas suction port of an external gas pump, characterized in that, Also includes: An annular plate (204) is disposed inside the tank body (1) and slides against the inner wall of the tank body (1); An air-permeable but liquid-impermeable membrane (206) arranged in an arc shape is fixedly connected to the annular plate (204); A motor (202) is installed at the upper end of the tank (1); The drive shaft (203) is fixedly connected to the output end of the motor (202). One end of the drive shaft (203) extends downward into the tank (1) and is fixedly connected to the annular plate (204) by a connecting rod (205). The upper end of the air-permeable but liquid-permeable membrane (206) is fixedly connected to the drive shaft (203).

2. A device for recycling inert gas in a very large crude carrier according to claim 1, wherein, An annular oil collection box (3) is provided between the inner wall of the tank (1) and the annular plate (204). The annular oil collection box (3) is fixedly connected to the inner wall of the tank (1). The outer wall of the annular plate (204) slides against the inner wall of the annular oil collection box (3). An oil drain valve pipe (301) is fixedly connected to one side of the lower end of the annular oil collection box (3). The oil outlet end of the oil drain valve pipe (301) extends obliquely downward out of the tank (1).

3. A device for recycling inert gas in a very large crude carrier according to claim 2, wherein A flow guiding inclined ring (302) is fixedly connected to the upper end of the annular oil collecting box (3) near the inner wall of the tank body (1), and an arc-shaped chamfer is provided at the upper end of the annular oil collecting box (3) near the annular plate (204).

4. The inert gas recycling device for a very large crude carrier according to claim 1, characterized in that, Multiple blades (207) are fixedly connected in a circumferential manner near the exhaust pipe (101) on the drive shaft (203). The surface of the blades (207) is provided with an oleophobic layer, and the exhaust port of the exhaust pipe (101) faces the blades (207).

5. The apparatus for recycling inert gas in a very large crude carrier according to claim 1, wherein It also includes a can lid (2), which is threadedly connected to the can opening at the upper end of the can body (1), and the motor (202) is fixedly connected to the can lid (2).

6. A device for recycling inert gas in a very large crude carrier according to claim 5, wherein The outer end of the can lid (2) is fixedly connected to a rotating handle (201) by a support rod.

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