KR20170140999A - Air bubble discharge system using scavenging of ship engine - Google Patents

Abstract

The present invention relates to an air bubble discharge system using scavenging of a ship engine and a method thereof, wherein in normal sailing, an air bubble is supplied to the bottom of a ship by using scavenging of a ship engine to reduce friction resistance of a hull. Moreover, in specific sailing to maintain hull balance, such as turning the hull and sailing in the tide, scavenging is discharged in the air to maintain pressure of the scavenging applied to an engine to be fitted to a predetermined range in accordance with an engine load. Therefore, safe sailing of a ship and an energy saving effect can be provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and a method for discharging air bubbles using a scavenging engine,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bubble discharge using a scavenging engine of a marine engine, and more particularly, to an air bubble delivery system using a sweep of a marine engine, In order to reduce the resistance, in the case of a specific operation in which the hull balance must be maintained, such as turning the hull or operating in the tide, the scavenging air is discharged to the atmosphere, The present invention relates to a system and a method for bubble discharge using a scavenging engine of a marine engine, in which a ship can be safely operated and an energy saving effect can be obtained.

Recently, various energy saving equipment have been applied to ships to reduce ship operation cost and reduce environmental pollutants.

In particular, in the case of a large ship, most of the hull resistance is very large in the frictional resistance caused by the relative flow of the outer water of the bottom (bottom) .

There are energy-saving technology (energy saving equipment) example as hull bottom air bubbles air lubrication (air lubricating) technology to supply the (air bubble) to reduce the frictional resistance on the large energy-saving effect, CO ₂ discharged from the ship It is known to be effective for cutbacks.

However, air lubricating technology requires equipment such as a compressor and a cooling water pump for the compressor to send air to the bottom of a large outer ship with a deep water draft, Since additional energy is consumed such as separate power, there is a limit to obtaining energy saving effect.

In order to solve such a problem, Japanese Unexamined Patent Publication (Kokai) No. 10-2014-0084273 discloses an air supply device for an air-lubricated ship using pressurized air (draft) or exhaust gas around the supercharger of an engine (main machine).

The term "exhaust gas" refers to the supply of fresh air into the cylinder by the internal combustion engine to exhaust the remaining gas and supply air for combustion. Since the temperature is increased due to compression in the supercharging operation, the exhaust gas is cooled do.

In the prior art, an air supply device for an air-lubricated ship which reduces the frictional resistance of water along the outer surface of the ship bottom of a ship in operation is disclosed in Korean Patent Laid-Open No. 10-2014-0084273.

However, in the prior art, air bubbles are supplied to the bottom of the ship using the sweep of the ship engine to reduce the frictional resistance of the hull. However, as in the case of turning the hull, Air bubbles are supplied to the bottom of the ship or air bubbles are not used to maintain a small pressure during a certain operation requiring maintenance of the hull balance, Let the crowd go.

Korean Patent Publication No. 10-2014-0084273 Korean Patent Publication No. 10-2014-0083944

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an air bubble reducing device for reducing frictional resistance of a hull by supplying air bubbles to a bottom of a ship using sweeping Such as the turning of the hull and the operation in the algae, the scavenging is carried out to the atmosphere to keep the scavenging pressure supplied to the engine to a predetermined range according to the engine load, And to provide a bubble discharging system and method using scavenging of a marine engine capable of ensuring safe operation of the marine vessel.

According to an aspect of the present invention, there is provided a bubble discharging system using a scavenging engine of a marine engine, comprising: a supercharger which generates pressurized air using a pressure of exhaust gas discharged from an engine and supplies the pressurized air to the engine; ; A scavenging receiver for providing compressed scavenging to the engine via the turbocharger; A scavenging line bypassing a desired part of the scavenging receiver; A bubble discharge unit for spraying the scum that is introduced into the scavenging line to the bottom of the ship in order to reduce frictional resistance of the hull; A scavenging switching valve installed in the scavenging bypass line for switching the scavenging flow to the scavenging bypass line; And a control unit for switching the scavenging switching valve to discharge the scavenging gas to either the bubble discharging unit or the atmosphere.

The scavenging receiver is provided with a pressure gauge, and the pressure gauge is connected to the control unit.

According to another aspect of the present invention, there is provided a bubble discharging system using scavenging of a marine engine, comprising: a supercharger for generating pressurized air using the pressure of the exhaust gas discharged from the engine and supplying the pressurized air to the engine; A scavenging receiver for providing compressed scavenging to the engine via the turbocharger; A first scavenging line bypassing a desired part of the scavenging receiver; A second scavenging line bypassing a desired portion of the scavenging receiver; A bubble discharge unit for spraying the scum that is introduced into the first scavenging line to the bottom of the ship in order to reduce frictional resistance of the hull; A first scavenging opening / closing valve installed in the first scavenging line for opening / closing the scavenging flow flowing to the scavenging line; A second scavenging opening / closing valve installed in the second scavenging line for opening / closing the scavenging flow flowing to the second scavenging line; And a control unit for opening one of the first scavenging valve and the second scavenging valve to discharge and control the scavenger.

The scavenging receiver is provided with a pressure gauge, and the pressure gauge is connected to the control unit.

Meanwhile, the bubble discharging method using the scavenging of a marine engine according to the present invention includes: generating pressurized air using pressure of exhaust gas of an engine in a supercharger and supplying the pressurized air to a scavenging receiver; Bypassing a desired portion of the scavenging receiver to a scavenging line; And spraying the scum flowing into the scavenging bypass line to either the bottom or the atmosphere.

In the step of jetting the scavenging to either the bottom or the atmosphere, when the ship is turning or the ship is operating in the tidal current, the scavenging is discharged to the atmosphere during a specific operation.

As described above, in the normal operation, the air bubble is supplied to the bottom of the ship using the sweep of the ship engine to reduce the frictional resistance of the hull, It is necessary to keep the hull balance in the same manner as in the operation of the internal combustion engine. In this case, And energy saving effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a bubble discharge unit in a bubble discharge system according to the present invention; FIG.
2 is a view showing a bubble discharge system according to a first embodiment of the present invention;
3 is a block diagram illustrating a bubble discharging method according to a first embodiment of the present invention
4 is a view showing a bubble discharge system according to a second embodiment of the present invention
5 is a view showing a bubble discharging system according to a third embodiment of the present invention
6 is a view showing a bubble discharging system according to a fourth embodiment of the present invention

Conventional air lubrication systems typically use electrically driven compressors or blowers to produce large amounts of compressed air. At this time, the energy efficiency of a ship equipped with a general air lubrication system may be lowered because the compressor or the blower generates a power corresponding to about 7% of the main power source.

On the other hand, the present invention generates compressed air using exhaust gas from an engine supplied to a turbine of a supercharger in a supercharging process. Since an air film is formed using compressed air, frictional resistance of a ship is reduced, Is higher than a general air lubrication system using electricity.

In other words, the propeller of the ship rotates according to the operation of the engine, and the propeller converts the rotational force into the propulsive force. The bubble discharging portion may form an air film for reducing frictional resistance by generating compressed air by using the energy of the exhaust gas generated during operation of the engine that provides the propulsion force to the ship. The turbine of the supercharger is supplied with the exhaust gas generated according to the operation of the engine. Exhaust gas is generated as the engine is operated by the combustion of fuel. The exhaust gas generated at this time can be discharged from the engine at a high speed to rotate the turbine. The compressed air thus generated is supplied to the engine together with the fuel, and the output of the engine can be increased through such supercharging operation. It is possible to reduce the energy required for air lubrication by forming an air bubble on the bottom by using the air compressed through the energy of the exhaust gas used in the superheating process shown in FIG. In addition, when it is necessary to maintain the balance of the hull during a certain operation such as turning of the hull, operation in the tide, etc., the ship can be safely operated by discharging the air to the atmosphere.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bubble discharge system and method using a scavenging method of a marine engine according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing a bubble discharge system according to a first embodiment of the present invention, and FIG. 3 is a block diagram illustrating a bubble discharge method according to the first embodiment of the present invention.

2 and 3, a bubble discharging system 100 using a scavenging apparatus according to a first embodiment of the present invention includes a supercharger 110, a scavenging receiver 120, a scavenging line 130, A discharge unit 140, a scavenging switching valve 150, and a control unit 160.

The supercharger 110 generates pressurized air using the pressure of the exhaust gas discharged from the engine 10 and supplies the pressurized air to the engine 10. That is, the supercharger 110 drives the turbine 111 of the supercharger 110 using the pressure of the exhaust gas discharged from the engine 10 to generate pressurized air and supplies the pressurized air to the scavenging receiver 120 . A high temperature is generated in the course of pressing and compressing the air and a cooler 115 may be installed between the supercharger 110 and the scavenge receiver 120 so that the high pressure heat air can be cooled and supplied to the engine 10 . The scavenging receiver (120) supplies the scavenged compressed air to the engine (10) via the supercharger (110). The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20, and the discharged gas drives the turbine 111 of the supercharger 110. The compressor 112 of the supercharger 110 composed of the same axis S as the turbine 111 compresses the air and supplies the compressed air to the scavenging receiver 120.

As described above, in order to reduce the frictional resistance by supplying air bubbles to the bottom of the vessel for energy saving equipment, a small part of the scavenging receiver 120 is disposed in the scavenging receiver 120 And the scavenging bypass line 130 for bypassing is connected. And a bubble discharging portion 140 for spraying the bottom of the scavenging line 130 to the bottom of the scavenging line 130 is provided at one side of the scavenging line 130.

In the middle of the scavenging bypass line (130), a scavenging switching valve (150) is provided for switching the scavenging flow to the scavenging bypass line (130).

And a control unit 160 for switching the scavenging switching valve 150 to control the discharge of the scavengers to either the bubble discharging unit 140 or the air. The scavenge receiver 120 is provided with a pressure gauge P and the pressure gauge P is connected with the control unit 160.

The operation effect of the bubble discharging system 100 using the scavenging of the marine engine according to the first embodiment of the present invention will now be described.

The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20 and the turbine 111 of the supercharger 110 is driven using the pressure of exhaust gas discharged at this time. The compressor 112 of the supercharger 110 composed of the same axis S as the turbine 111 compresses the air and supplies the compressed air to the scavenging receiver 120. In the course of pressurizing and compressing the air, a high temperature is generated, and this high-temperature pressurized air is cooled to a proper temperature by the cooler 115 and then supplied to the engine 10.

When the air bubble is supplied to the bottom of the vessel for energy conservation in order to reduce frictional resistance, the control unit 160 switches the scavenging switching valve 150 to the bubble discharging unit 140, And the bubble discharging unit 140 reduces the frictional resistance of the hull by sending air bubbles to the bottom of the hull.

When the hull balance needs to be maintained at the time of a specific operation such as turning the hull or operating in the tide, the control unit 160 switches the scavenging switching valve 150 to the bubble discharging unit 140, Do not supply scavenging. This is because the air bubbles may flow into the propeller or the cooling water intake side when the hull turns or the algae influences, which may cause the vibration of the hull and the cooling efficiency to be lowered.

In other words, at the time of a specific operation, the control unit 160 switches the scavenging switching valve 150 to discharge the scavenging to the atmosphere. The pressure gauge P is used to measure the pressure inside the scavenging receiver 120 and maintain it at an appropriate pressure.

Referring to FIGS. 2 and 3, a bubble discharging method using a scavenging engine of a marine engine according to the present invention generates pressurized air using the pressure of the exhaust gas of the engine 10 in the turbocharger 110, (S 110) to the receiver 120; (S 120) of bypassing a desired portion of the scavenging receiver (120) to the scavenging line (130); And a step (S 130) of spraying the scum flowing into the scavenging bypass line (130) to either the bottom or the atmosphere. In a step S110 of spraying the scum as either the bottom or the atmosphere, if the ship is turning or the ship is operating in an algae, the scum is discharged to the atmosphere.

4 is a bubble discharging system using the scavenging of a marine engine according to a second embodiment of the present invention.

Referring to FIG. 4, a bubble discharging system 200 using a scavenging system according to a second embodiment of the present invention includes a supercharger 210, a scavenging receiver 220, a second scavenging line 231, A first scavenging opening and closing valve 250, a second scavenging opening and closing valve 251, and a control unit 260. [

The supercharger 210 generates pressurized air using the pressure of the exhaust gas discharged from the engine 10, and supplies the pressurized air to the engine 10. That is, the supercharger 210 drives the turbine 211 using the pressure of the exhaust gas discharged from the engine 10 to generate pressurized air, and supplies the pressurized air to the scavenging receiver 220.

A high temperature is generated in the process of compressing and compressing the air and a cooler 215 may be installed between the turbocharger 210 and the scavenge receiver 220 so that the high pressure heat air can be cooled and supplied to the engine 10 .

The scavenging receiver (220) supplies the scavenged gas to the engine (10) via the supercharger (210). The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20, and the discharged gas drives the turbine 211 of the supercharger 210. The compressor 212 of the turbocharger 210 having the same axis as the turbine 211 compresses the air and supplies the compressed air to the scavenging receiver 220.

The first scavenging lines 230 and 231 that bypass the scavenging part of the scavenging receiver 220 are provided. And a bubble discharge unit 240 for spraying the scum that is introduced into the first scavenging line 230 to the bottom of the ship in order to reduce frictional resistance of the ship.

The first scavenging bypass line (230) is provided with a first scavenging on / off valve (250) to open and close a desired scavenging flow to the first scavenging line (230).

A second scavenging on / off valve 251 is provided in the second scavenging bypass line 231 to open / close a desired scavenging flow to the second scavenging line 231.

The controller 260 selectively opens any one of the first scavenging valve 250 and the second scavenging valve 260 to discharge and control the scavenging. The scavenge receiver 220 is provided with a pressure gauge P and the pressure gauge P is connected with the control unit 260.

The operation effect of the bubble discharging system 200 using the scavenging of the marine engine according to the second embodiment of the present invention will now be described.

The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20 and the turbine 211 of the supercharger 210 is driven using the pressure of exhaust gas discharged at this time.

The compressor 212 of the supercharger 210 composed of the same axis S as the turbine 211 compresses the air and supplies the compressed air to the scavenging receiver 220. In the course of pressing and compressing the air, a high temperature is generated, and this high-temperature pressurized air is cooled to a proper temperature by the cooler 215 and then supplied to the engine 10.

When it is desired to reduce the frictional resistance by supplying an air bubble to the bottom of the ship for energy saving during normal operation, the control unit 260 opens the first scavenging valve 250 to open the bubble discharging unit 240, and the bubble discharging unit 240 reduces the frictional resistance of the hull by sending air bubbles to the bottom of the ship. At the same time, the second scavenging valve 251 is closed.

When it is necessary to maintain a hull balance such as a hull turn or a navigation within a tide, the control unit 260 opens the first scavenging valve 250 to open the bubble discharge unit 240). This is because the air bubbles may flow into the propeller or the cooling water intake side when the hull is turned or influenced by the algae, resulting in vibration of the hull or deterioration of the cooling efficiency.

In other words, at the time of a specific operation, the controller 260 closes the first scavenging valve 250 and opens the second scavenging valve 251 to discharge the scavenging gas to the atmosphere. The pressure gauge P is used to measure the pressure inside the scavenging receiver 220 and keep it at a proper pressure.

5 is a view showing a bubble discharging system according to a third embodiment of the present invention.

5, the bubble discharging system 300 according to the third embodiment of the present invention includes a supercharger 310, a scavenging receiver 320, a scavenging line 330, a bubble discharging unit 340, (350), and a control unit (360).

The turbocharger 310 generates pressurized air using the pressure of the exhaust gas discharged from the engine 10 and supplies the pressurized air to the engine 10. That is, the supercharger 310 drives the turbine 311 using the pressure of the exhaust gas discharged from the engine 10 to generate pressurized air, and supplies the pressurized air to the scavenging receiver 320.

A high temperature is generated in the process of compressing and compressing the air and a cooler 315 may be installed between the turbocharger 310 and the scavenge receiver 320 so that the high temperature compressed air can be cooled and supplied to the engine 10 .

The scavenging receiver (320) provides the scavenging gas to the engine (10) via the supercharger (310). The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20, and the discharged gas drives the turbine 311 of the turbocharger 310. The compressor 312 of the supercharger 310 constituted by the same axis S as the turbine 311 compresses the air and supplies the compressed air to the scavenging receiver 320.

A scavenging line 330 for bypassing a desired part of the scavenging receiver 320 and a bubble discharging unit 330 for discharging the scavenging air flowing into the scavenging line 330 to reduce the frictional resistance of the hull, (340).

The scavenging bypass line (330) is provided with a scavenging on / off valve (350) to control the scavenging flow of the scavenging line (330).

The bubble discharge system 300 according to the third embodiment of the present invention is characterized in that the bubble discharge system 300 according to the third embodiment of the present invention includes an additional bypass Line 370 is provided. The additional bypass line 370 is provided with a scavenging valve 371 to control the flow of the scavenging flow to the additional bypass line 370.

The controller 360 selectively opens the scavenging valve 350 to discharge the scavenging gas. The scavenge receiver 320 is provided with a pressure gauge P and the pressure gauge P is connected with the control unit 360.

The operation effect of the bubble discharging system 300 using the scavenging of the marine engine according to the third embodiment of the present invention will now be described.

The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20 and the turbine 311 of the turbocharger 310 is driven by the pressure of the exhaust gas discharged at this time.

The compressor 312 of the supercharger 310 constituted by the same axis S as the turbine 311 compresses the air and supplies the compressed air to the scavenging receiver 320. In the course of pressing and compressing the air, a high temperature is generated, and the high-pressure, pressurized air is cooled to a proper temperature by the cooler 315 and then supplied to the engine 10.

The control unit 360 opens the scavenging valve 350 to supply the air bubbles to the bubble discharging unit 340 so as to reduce the frictional resistance by supplying air bubbles to the bottom of the ship for energy saving during normal operation. And the bubble discharging unit 340 sends a bubble, that is, an air bubble to the bottom of the vessel, to reduce the frictional resistance of the hull.

In the bubble discharge system 300 according to the third embodiment of the present invention, the compressed gas (draft) flowing into the cooler 315 through the additional bypass line 370 is bypassed to the front end of the turbocharger 310, ) Can be reduced, and the energy can be used as a waste heat recovery steam generator.

6 is a configuration diagram showing a bubble discharge system according to a fourth embodiment of the present invention.

Referring to FIG. 6, a bubble discharging system 400 according to a fourth embodiment of the present invention includes a turbocharger 410, a scavenging receiver 420, a bubble discharging unit 440, a scavenging valve 450, 460).

The turbocharger 410 generates pressurized air using the pressure of the exhaust gas discharged from the engine 10 and supplies the pressurized air to the engine 10 side. That is, the supercharger 410 drives the turbine 411 using the pressure of the exhaust gas discharged from the engine 10 to generate pressurized air, and supplies the pressurized air to the scavenging receiver 420.

A high temperature is generated in the process of compressing and compressing the air and a cooler 415 may be installed between the turbocharger 410 and the scavenge receiver 420 so that the high pressure heat air can be cooled and supplied to the engine 10 .

The scavenging receiver 420 provides compressed scavenging to the engine 10 via the supercharger 410. The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20, and the discharged gas drives the turbine 411 of the supercharger 410. The compressor 412 of the supercharger 410 composed of the same axis S as the turbine 411 compresses the air and supplies it to the scavenging receiver 420.

A scavenging line 430 for bypassing a desired part of the scavenging receiver 420 and a bubble discharging unit 420 for discharging a scavenger flowing into the scavenging line 430 in order to reduce frictional resistance of the hull, (440).

The scavenging bypass line (430) is provided with a scavenging on / off valve (450) to control the scavenging flow to the scavenging line (430).

As a feature of the bubble discharge system 400 according to the fourth embodiment of the present invention, an additional bypass line 470 is installed at the rear end of the turbine 411. The additional bypass line (470) is provided with a scavenging valve (471) to control the flow of the scavenging flow to the additional bypass line (470). The compressed waste through the compressor 412 is configured to be discharged directly to the waste without passing through the cooler 415 through the additional bypass line 470. [

The control unit 460 selectively opens and closes the scavenging opening / closing valve 450 to discharge and control the scavenging. The scavenge receiver 420 is provided with a pressure gauge P and the pressure gauge P is connected with the control unit 460.

The operation effect of the bubble discharging system 400 using the scavenging of the marine engine according to the fourth embodiment of the present invention will now be described.

The exhaust gas discharged from the engine 10 is discharged through the exhaust gas receiver 20 and the turbine 411 of the supercharger 410 is driven by the pressure of exhaust gas discharged at this time.

The compressor 412 of the supercharger 410 composed of the same axis S as the turbine 411 compresses the air and supplies it to the scavenging receiver 420. High temperature is generated in the course of pressing and compressing the air, and this high-temperature pressurized air is cooled to a proper temperature by the cooler 415 and then supplied to the engine 10. [

The control unit 460 opens the scavenging opening / closing valve 450 to open the bubble discharging unit 440 and the bubble discharging unit 440 in order to reduce the frictional resistance by supplying air bubbles to the bottom of the ship for energy saving during normal operation. And the bubble discharging unit 440 sends a draft, that is, an air bubble to the bottom of the ship, thereby reducing the frictional resistance of the hull.

In the bubble discharge system 400 according to the fourth embodiment of the present invention, supercharging can be efficiently controlled by discharging it through the additional bypass line 470 directly to the waste without passing through the cooler 415.

As described above, in the normal operation, the air bubble is supplied to the bottom of the ship using the sweep of the ship engine to reduce the frictional resistance of the hull, , It is necessary to keep the hull balance in the same manner as in the operation of the internal combustion engine, have.

10: Engine
20: exhaust gas receiver
100: Bubble discharge system
110: supercharger
111: Turbine
112: compressor
115: cooler
120: Scavenge Receiver
130: scavenging line
140:
150: Vacuum switch valve
160:
S: Axis

Claims (6)

A supercharger for generating pressurized air using the pressure of the exhaust gas discharged from the engine and supplying the pressurized air to the engine;
A scavenging receiver for providing compressed scavenging to the engine via the turbocharger;
A scavenging line bypassing a desired part of the scavenging receiver;
A bubble discharge unit for spraying the scum that is introduced into the scavenging line to the bottom of the ship in order to reduce frictional resistance of the hull;
A scavenging switching valve installed in the scavenging bypass line for switching the scavenging flow to the scavenging bypass line; And
And a controller for switching the scavenging switching valve to control the scavenging of the scavenging unit to either the bubble discharging unit or the atmosphere. The method according to claim 1,
Wherein the scavenging receiver is provided with a pressure gauge, and the pressure gauge is connected to the control unit. A supercharger for generating pressurized air using the pressure of the exhaust gas discharged from the engine and supplying the pressurized air to the engine;
A scavenging receiver for providing compressed scavenging to the engine via the turbocharger;
A first scavenging line bypassing a desired part of the scavenging receiver;
A second scavenging line bypassing a desired portion of the scavenging receiver;
A bubble discharge unit for spraying the scum that is introduced into the first scavenging line to the bottom of the ship in order to reduce frictional resistance of the hull;
A first scavenging opening / closing valve installed in the first scavenging line for opening / closing the scavenging flow flowing to the scavenging line;
A second scavenging opening / closing valve installed in the second scavenging line for opening / closing the scavenging flow flowing to the second scavenging line; And
And a control unit for opening one of the first scavenging valve and the second scavenging valve to discharge and control the scavenging unit. The method of claim 3,
Wherein the scavenging receiver is provided with a pressure gauge, and the pressure gauge is connected to the control unit. Generating pressurized air using the pressure of the exhaust gas of the engine in the turbocharger and supplying the pressurized air to the scavenging receiver;
Bypassing a desired portion of the scavenging receiver to a scavenging line; And
And blowing out the scavenging air flowing into the scavenging bypass line to either the bottom or the atmospheric air. The method of claim 5,
In the step of ejecting the scum as either the bottom or the atmosphere,
And discharging the scavenging air to the atmosphere when the ship is turning or the ship is operating in the algae.

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