KR102188369B1 - Vapor oil recycling and air pollution prevention system - Google Patents

Abstract

The present invention relates to an air pollution and fire preventing system through reduction and recycling of oil vapor. The air pollution and fire preventing system through reduction and recycling of oil vapor according to the present invention comprises: a plurality of oil tanks arranged independent of one another; an oil vapor reduction unit arranged in each of the oil tanks and reducing oil vapor generated in the oil tanks; a plurality of individual supply lines individually connected to the oil tanks and individually supplying oil in the oil tank; a plurality of bleed valves connected to the individual supply lines to be openable and closeable; a commonly used supply line connected to the individual supply lines for a common use; a filter unit coupled to an end portion of the commonly used supply line with respect to the direction of supplying the oil; a cooler arranged on the commonly used supply line and cooling the oil directed to the filter unit through the commonly used supply line; and a first flashback arrestor arranged on the commonly used supply line and preventing flashback.

Description

Air pollution and fire prevention system through oil vapor reduction and recovery {VAPOR OIL RECYCLING AND AIR POLLUTION PREVENTION SYSTEM}

The present invention relates to a system for preventing air pollution and fire through reduction and recovery of oil vapor, and more specifically, it is possible to reduce the amount of oil vapor generated by a simple structure and method for primary cooling of oil vapor, as well as to effectively recover it. Air pollution and fire prevention system through reduction and recovery of oil vapor that not only can reduce fire risk and air pollution, but also prevent the performance deterioration of the filter, and further remove traces of oil vapor (VOC) by secondary filtering It is about.

Oil vapor is a generic term in which oil droplets (GAS) with a particle size of 1 to 10 m are distributed in the air in the form of fog.

Oil vapor is generated by spraying fuel oil, lubricant oil, hydraulic base oil, and mechanical equipment into fine gaps at high pressure, or when the temperature of the storage tank rises, flows out from equipment, pipes, tanks, etc., and exists in a liquid state, and then comes into contact with high-temperature equipment. It can be produced by meeting the air at a lower temperature after being vaporized by increasing the temperature.

On the other hand, such oil vapor can be generated a lot in the oil storage facility as shown in FIG. That is, referring to FIG. 1, a typical oil storage facility includes a plurality of oil tanks 10.

The plurality of oil tanks 10 are connected by an oil pipe 20. Accordingly, the oil in the oil tank 10 may be transferred to the destination through the oil pipe 20.

At this time, since one side of the oil pipe 20 is exposed to the atmosphere as it is, conventionally, the oil vapor is discharged into the atmosphere through the oil pipe 20, thereby causing a risk of fire and environmental pollution.

On the other hand, the oil storage facility as shown in FIG. 1 is a facility widely applied to gas stations, large ships, or plant facilities, and such conventional oil storage facilities do not have facilities to reduce oil vapor, increasing the risk of fire and causing environmental pollution. .

Let's look at this in more detail. Oil including oil is filled in the oil tank 10, and the filled oil may change into an oil vapor state while evaporating according to ambient temperature conditions, and may be transferred to a destination through the oil pipe 20.

At this time, when the amount of oil vapor increases, the risk of fire leaking outward may increase while causing damage to the oil tank 10 or the oil pipe 20.

In other words, when the concentration of oil vapor reaches the lower explosion limit defined by the International Classification Association (IACS UR M67/LEL: Low Explosive Level), it contacts a heat source higher than the ignition point or sparks caused by static electricity, causing fire or explosion. In addition, when released into the atmosphere, it causes environmental pollution.

This means that when the concentration of oil vapor that exists in the enclosed space increases gradually, it reaches the lowest explosion concentration, and when there is a heat source higher than the ignition point in the same space, it is ignited, causing a disaster of fire or explosion.

Therefore, in order to eliminate such an obstruction, it is necessary to separately collect and store the oil vapor leaking out from the oil tank 10 or the oil pipe 20 or cool the oil vapor again to reduce the amount of oil vapor, and research on this Continues.

However, considering that the existing technology is not only complex due to its structural limitations, but also can require a large cost to construct the facility, it is possible to prevent air pollution and fire through the reduction and recovery of previously unknown new concepts of oil vapor. There is a need to develop technology for the system.

Korean Intellectual Property Office Application No. 10-2009-0023105 Korean Intellectual Property Office Application No. 10-2009-0121597 Korean Intellectual Property Office Application No. 10-2017-0133642 Korean Intellectual Property Office Application No. 10-2017-0133735

An object of the present invention is that it is possible to reduce the amount of oil vapor generated by a simple structure and method for primary cooling of the oil vapor, as well as to be able to recover it effectively, thereby reducing the risk of fire and air pollution, as well as preventing the performance degradation of the filter. Furthermore, it is to provide a system for preventing air pollution and fire through reduction and recovery of oil vapor that can completely remove trace amounts of oil vapor (VOC) by secondary filtering.

The object is, a plurality of oil tanks provided independently of each other; An oil vapor reduction unit provided in the oil tanks and configured to reduce oil vapor generated in the oil tank; A plurality of individual supply lines respectively connected to the oil tanks and individually supplying the oil in the oil tank; A plurality of bleed valves connected to the individual supply lines to be opened and closed; A common supply line commonly connected to the individual supply lines; A filter unit to which an end of the common supply line is coupled with respect to a direction in which oil is supplied; A cooler provided on the common supply line and cooling oil directed to the filter unit through the common supply line; And it is provided on the common supply line, it is achieved by the air pollution and fire prevention system through the oil vapor reduction and recovery, characterized in that it comprises a first flashback preventer for preventing backfire.

The oil vapor reduction unit includes a plurality of radiator plates arranged in a zigzag manner, and cooling water or cooling air may circulate through the radiator plates.

A nitrogen generator generating nitrogen (N2); A first nitrogen line for supplying nitrogen from the nitrogen generator to the oil tanks; A second nitrogen line branched from the first nitrogen line and supplying nitrogen from the nitrogen generator to the filter unit; A nitrogen recovery line connected to the nitrogen generator and the filter unit and recovering the recovered nitrogen in the filter unit to the first nitrogen line; A pressure relief valve provided on the nitrogen recovery line; And an oil vapor liquid recovery line connected to the cooler and the last oil tank and recovering the oil vapor liquid that has passed the cooler to the last oil tank.

A separator tank disposed adjacent to the filter unit; A first connection line connecting the filter unit and the separator tank; A second connection line connecting the last oil tank and the separator tank; And a second backfire prevention device provided on the second connection line and preventing backfire.

A system controller for controlling the operation of the nitrogen generator and the bleed valve through an organic mechanism to reduce and recover the oil vapor that may be generated in the oil tanks may be further included.

On the other hand, the object is, a plurality of oil tanks provided independently of each other; A plurality of individual supply lines respectively connected to the oil tanks and individually supplying the oil in the oil tank; A plurality of bleed valves connected to the individual supply lines to be opened and closed; A common supply line commonly connected to the individual supply lines; An oil vapor reduction unit provided on the common supply line and configured to reduce oil vapor generated in the oil tank and passing through the common supply line; A filter unit to which an end of the common supply line is coupled with respect to a direction in which oil is supplied; A cooler provided on the common supply line and cooling oil directed to the filter unit through the common supply line; A first backfire preventer provided on the common supply line and preventing backfire; A nitrogen generator generating nitrogen (N2); A first nitrogen line for supplying nitrogen from the nitrogen generator to the oil tanks; A second nitrogen line branched from the first nitrogen line and supplying nitrogen from the nitrogen generator to the filter unit; A nitrogen recovery line connected to the nitrogen generator and the filter unit and recovering the recovered nitrogen in the filter unit to the first nitrogen line; A pressure relief valve provided on the nitrogen recovery line; And an oil vapor liquid recovery line connected to the cooler and the last oil tank and recovering the oil vapor liquid that has passed the cooler to the last oil tank. A separator tank disposed adjacent to the filter unit; A first connection line connecting the filter unit and the separator tank; A second connection line connecting the last oil tank and the separator tank; A second backfire prevention device provided on the second connection line and preventing backfire; And a system controller for controlling the operation of the nitrogen generator and the bleed valve by an organic mechanism to reduce and recover the oil vapor that may occur in the oil tanks. Air pollution through reduction and recovery of oil vapor, characterized in that it comprises And a fire protection system.

According to the present invention, it is possible to reduce the amount of oil vapor generated by a simple structure and method for primary cooling of the oil vapor, as well as to effectively recover it, thereby reducing the risk of fire and air pollution, as well as preventing the performance degradation of the filter, Furthermore, there is an effect of completely removing trace amounts of oil vapor (VOC) by secondary filtering.

1 is a structural diagram of a general oil storage facility.
2 is a system structure diagram of an air pollution and fire prevention system through reduction and recovery of oil vapor according to the first embodiment of the present invention.
3 is a detailed structural diagram of an oil vapor reduction unit shown in FIG. 2.
4 is a control block diagram for the air pollution and fire prevention system through the reduction and recovery of oil vapor of FIG.
5 is a detailed structural diagram of a steam reduction unit applied to the air pollution and fire prevention system through oil vapor reduction and recovery according to the second embodiment of the present invention.
6 is a system structure diagram of an air pollution and fire prevention system through oil vapor reduction and recovery according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention.

However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text.

For example, since the embodiments may be modified in various ways and may have various forms, the scope of the present invention should be understood as including equivalents capable of realizing the technical idea.

In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all or only such effects, the scope of the present invention should not be understood as being limited thereto.

In the present specification, the present embodiment is provided to complete the disclosure of the present invention, and to fully inform a person of ordinary skill in the art to which the present invention belongs. And the invention is only defined by the scope of the claims.

Therefore, in some embodiments, well-known components, well-known operations, and well-known techniques have not been described in detail in order to avoid obscuring interpretation of the present invention.

Meanwhile, the meaning of the terms described in the present invention is not limited to the dictionary meaning, and should be understood as follows.

When a component is referred to as being "connected" to another component, it should be understood that it may be directly connected to the other component, but another component may exist in the middle. On the other hand, when it is mentioned that a component is "directly connected" to another component, it should be understood that there is no other component in the middle. On the other hand, other expressions describing the relationship between constituent elements, that is, "between" and "directly between" or "adjacent to" and "directly adjacent to" should be interpreted as well.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as “comprise” or “have” refer to the specified features, numbers, steps, actions, components, parts, or It is to be understood that a combination is intended to be specified and does not preclude the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined.

Terms defined in a commonly used dictionary should be construed as having the meanings of the related technology, and cannot be construed as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of the embodiments, the same reference numerals are assigned to the same components, and the description of the same reference numerals is omitted in some cases.

(Example 1)

2 is a system structure diagram of an air pollution and fire prevention system through oil vapor reduction and recovery according to a first embodiment of the present invention, FIG. 3 is a detailed structural diagram of the oil vapor reduction unit shown in FIG. 2, and FIG. 4 is Fig. 2 is a control block diagram for the air pollution and fire prevention system through oil vapor reduction and recovery.

Referring to these drawings, the air pollution and fire prevention system through oil vapor reduction and recovery according to the present embodiment can reduce the amount of oil vapor generated by a simple structure and method for primary cooling of oil vapor, as well as effectively recover it. In addition to reducing the risk and air pollution, it can prevent the deterioration of the filter, and furthermore, it is possible to completely remove a trace amount of oil vapor (VOC) by secondary filtering.

The air pollution and fire prevention system through the reduction and recovery of oil vapor according to the present embodiment, which can provide such an effect, reduces the amount of oil vapor that can be generated in the plurality of oil tanks 110, while appropriately recovering the generated oil vapor. To be there.

In particular, since the air pollution and fire prevention system through the reduction and recovery of oil vapor according to the present embodiment has a closed circulation structure, the oil vapor is not discharged to the outside. Therefore, it does not cause environmental pollution problems due to external emission of oil vapor.

The oil tank 110 is a tank that stores oil. Oil can be liquid or gaseous. As shown in FIG. 2, a plurality of oil tanks 110 may be provided independently of each other. Equipment in which a plurality of oil tanks 110 are provided independently of each other may be, for example, a storage station, a tank terminal, a gas station, a large ship, or a plant facility.

Such an oil tank 110 reacts according to an external air condition, that is, vaporizes, so that a part of the oil tank may be changed into oil vapor. In order to reduce the oil vapor that changes in this way, the oil vapor reduction unit 130 is provided.

In this embodiment, the oil vapor reduction unit 130 is provided in the oil tanks 110 and serves to reduce the oil vapor generated in the oil tank 110, and may be a type of cooler. The configuration for this will be further described in the following embodiments.

For reference, in this embodiment, the cooler is provided in the oil tanks 110, but may also be provided on a line of the system. In other words, the cooler may be provided in both the oil tank 110 or the line, or may be provided in any one place, although it should be said that all of them belong to the scope of the present invention even if they are not shown in the drawings.

As such, the oil vapor reduction unit 130 may be a cooler, and the oil vapor reduction unit 130 may be applied in the form of a cooler, for example, as a plurality of radiator plates 131 arranged in a zigzag manner. Although the radiator plate 131 is simply shown in the drawing, cooling water or cooling air must be circulated through the radiator plate 131 for the function of the radiator plate 131. That is, a method of connecting the radiator plate 131 shown in the drawing with a connection pipe and allowing a cooling fluid, for example, gas or liquid, to circulate through the radiator plate 131 may be applied. Of course, unlike FIG. 3, the oil vapor reduction unit 130 may be implemented only with a pipe line. That is, it is possible to apply a method of reducing oil vapor by concentrically distributing the pipeline through which the cooling fluid circulates inside to contact the oil vapor, and all of these items should be said to belong to the scope of the present invention.

As in the present embodiment, the radiator plates 131 are arranged to overlap a certain section in a zigzag manner or return to the inlet, so that the flow path through which the oil vapor can heat exchange can be lengthened. Accordingly, it is possible to increase the cooling and collection efficiency of the oil vapor generated in the oil tank 110, thereby significantly reducing the amount of oil vapor entering the final filter unit 120.

Individual supply lines 111 are respectively connected to the oil tanks 110. The oil in the oil tank 110 is individually supplied through the individual supply line 111. A bleed valve 112 is connected to the individual supply lines 111 so as to open and close. The bleed valve 112 may be an electronic solenoid valve. Individual supply lines 111 are commonly connected through a common supply line 114.

The end of the common supply line 114 is connected to the filter unit 120 with respect to the direction in which oil is supplied. At this time, a cooler 115 is provided on the common supply line 114 to cool the oil directed to the filter unit 120 through the common supply line 114. The cooler 115 serves to cool the oil vapor together with the oil vapor reduction unit 130.

On the common supply line 114 adjacent to the cooler 115, a first backfire preventer 116 is applied to prevent backfire.

Meanwhile, a nitrogen generator 140 for generating nitrogen (N2) is provided in the air pollution and fire prevention system through oil vapor reduction and recovery according to the present embodiment for reduction and proper recovery of oil vapor.

The nitrogen generator 140 is provided with a first nitrogen line 141 and a second nitrogen line 142. The first nitrogen line 141 is a line that supplies nitrogen from the nitrogen generator 140 to the oil tanks 110, and the second nitrogen line 142 is branched from the first nitrogen line 141, but the nitrogen generator 140 ) Is a line that supplies nitrogen to the filter unit 120.

Nitrogen supplied to the filter unit 120 along the second nitrogen line 142 serves to desorb VOCs collected in the filter unit 120 into nitrogen. The nitrogen generator 140 and the filter unit 120 are provided with a nitrogen recovery line 143 for recovering the recovered nitrogen in the filter unit 120 to the first nitrogen line 141. A pressure relief valve 144 is provided on the nitrogen recovery line 143. If the pressure relief valve 144 is not operated, there is no possibility of VOC being discharged out of the system because nitrogen is not supplied. Therefore, it is advantageous in preventing air pollution. Meanwhile, all valves in the system including the pressure relief valve 144 are automatically controlled. For example, if the safety pressure of the tank is set to 2k, the pressure safety valve 144 is automatically opened when the tank pressure is 2k or more. If the amount of nitrogen supplied is insufficient, the nitrogen generator 140 automatically operates so that nitrogen may be supplied together with the VOC in the tank 110.

The cooler 115 and the last oil tank 110 are provided with an oil vapor liquid recovery line 145 for recovering the oil vapor liquid that has passed through the cooler 115 to the last oil tank 110.

In this system, a separator tank 151 is disposed adjacent to the filter unit 120. The filter unit 120 and the separator tank 151 are connected by a first connection line 152. The last oil tank 110 and the separator tank 151 are connected by a second connection line 153. In addition, a second backfire preventer 154 is mounted on the second connection line 153 to prevent backfire.

Meanwhile, the system controller 160 is further mounted in the air pollution and fire prevention system through oil vapor reduction and recovery according to the present embodiment.

The system controller 160 controls the operation of the nitrogen generator 140 and the bleed valve 112 through an organic mechanism to reduce and recover the oil vapor that may occur in the oil tanks 110.

The system controller 160 performing this role may include a central processing unit 161 (CPU), a memory 162 (MEMORY), and a support circuit 163 (SUPPORT CIRCUIT).

The central processing unit 161 is used to control the operation of the nitrogen generator 140 and the bleed valve 112 with an organic mechanism to reduce and recover the oil vapor that may occur in the oil tanks 110 in this embodiment. It may be one of various computer processors that can be applied industrially.

The memory 162 (MEMORY) is connected to the central processing unit 161. The memory 162 can be installed locally or remotely as a computer-readable recording medium, and can be easily used, such as random access memory (RAM), ROM, floppy disk, hard disk, or any digital storage type. It may be at least one or more memories.

The support circuit 163 (SUPPORT CIRCUIT) is coupled with the central processing unit 161 to support typical operation of the processor. The support circuit 163 may include a cache, a power supply, a clock circuit, an input/output circuit, a subsystem, and the like.

In this embodiment, the system controller 160 controls the operation of the nitrogen generator 140 and the bleed valve 112 with an organic mechanism in order to reduce and recover the oil vapor that may be generated in the oil tanks 110. A series of control processes and the like may be stored in the memory 162. Typically software routines may be stored in memory 162. Software routines can also be stored or executed by other central processing units (not shown).

Although the process according to the present invention has been described as being executed by a software routine, it is also possible that at least some of the processes of the present invention are performed by hardware. As such, the processes of the present invention may be implemented by software executed on a computer system, by hardware such as an integrated circuit, or by a combination of software and hardware.

According to the present embodiment acting based on the structure as described above, it is possible to reduce the amount of oil vapor generated by a simple structure and method of primary cooling the oil vapor, as well as to effectively recover it, thereby reducing the risk of fire and air pollution. In addition, it is possible to prevent the performance degradation of the filter, and furthermore, it is possible to completely remove a trace amount of oil vapor (VOC) by secondary filtering.

(Example 2)

5 is a detailed structural diagram of a steam reduction unit applied to the air pollution and fire prevention system through oil vapor reduction and recovery according to the second embodiment of the present invention.

Referring to this drawing, the oil vapor reduction unit 230 for reducing the oil vapor generated in the oil tank 110 in the oil tank 110 of the air pollution and fire prevention system through the reduction and recovery of oil vapor according to the present embodiment Can be applied.

At this time, the oil vapor reduction unit 230 includes a plurality of radiator plates 131 arranged in a zigzag manner, a cooler 132 disposed adjacent to the radiator plate 131 and cooling the radiator plate 131, and a radiator. It may include an oil vapor guide 233 for guiding the oil vapor to the plates 131.

As such, the oil vapor is guided to the radiator plates 131 by the oil vapor guide 233, and the cooling efficiency of the oil vapor may be increased as the radiator plates 131 are continuously cooled by the cooler 132. Accordingly, the oil vapor can be converted back to oil and collected, thereby preventing the performance degradation of the filter unit 120.

Even if this embodiment is applied, it is possible to reduce the amount of oil vapor generated by a simple structure and method for primary cooling of the oil vapor, as well as to effectively recover it, thereby reducing the risk of fire and air pollution, as well as preventing the performance degradation of the filter, Furthermore, trace amounts of oil vapor (VOC) can be completely removed by secondary filtering.

(Third Example)

6 is a system structure diagram of an air pollution and fire prevention system through oil vapor reduction and recovery according to a third embodiment of the present invention.

Referring to this drawing, in the case of the present embodiment, it is shown that the oil vapor reduction unit 130 is applied on the common supply line 114, and even if implemented in this way, the effects of the present invention can be provided.

In addition, it should be said that a system in which the first and third embodiments are merged together also falls within the scope of the present invention.

Even if this embodiment is applied, it is possible to reduce the amount of oil vapor generated by a simple structure and method for primary cooling of the oil vapor, as well as to effectively recover it, thereby reducing the risk of fire and air pollution, as well as preventing the performance degradation of the filter, Furthermore, trace amounts of oil vapor (VOC) can be completely removed by secondary filtering.

As described above, the present invention is not limited to the described embodiments, and it is apparent to those of ordinary skill in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such modifications or variations belong to the claims of the present invention.

110: oil tank 111: individual supply line
112: bleed valve 114: common supply line
115: cooler 116: first backfire preventer
120: filter unit 130: oil vapor reduction unit
131: radiator plate 140: nitrogen generator
141: first nitrogen line 142: second nitrogen line
143: nitrogen recovery line 144: pressure relief valve
145: vapor liquid recovery line 151: separator tank
152: first connection line 153: second connection line
154: second backfire protector 160: system controller

Claims (6)

A plurality of oil tanks provided independently of each other;
An oil vapor reduction unit provided in the oil tanks and configured to reduce oil vapor generated in the oil tank;
A plurality of individual supply lines respectively connected to the oil tanks and individually supplying the oil in the oil tank;
A plurality of bleed valves connected to the individual supply lines to be opened and closed;
A common supply line commonly connected to the individual supply lines;
A filter unit to which an end of the common supply line is coupled with respect to a direction in which oil is supplied;
A cooler provided on the common supply line and cooling oil directed to the filter unit through the common supply line;
A first backfire preventer provided on the common supply line and preventing backfire;
A nitrogen generator generating nitrogen (N2);
A first nitrogen line for supplying nitrogen from the nitrogen generator to the oil tanks;
A second nitrogen line branched from the first nitrogen line and supplying nitrogen from the nitrogen generator to the filter unit;
A nitrogen recovery line connected to the nitrogen generator and the filter unit and recovering the recovered nitrogen in the filter unit to the first nitrogen line;
A pressure relief valve provided on the nitrogen recovery line; And
And an oil vapor liquid recovery line connected to the cooler and the last oil tank and recovering the oil vapor liquid that has passed the cooler to the last oil tank.
The method of claim 1,
The oil vapor reduction unit includes a plurality of radiator plates arranged in a zigzag manner, wherein cooling water or cooling air is circulated to the radiator plate.Air pollution and fire prevention system through oil vapor reduction and recovery.
The method of claim 1,
A separator tank disposed adjacent to the filter unit;
A first connection line connecting the filter unit and the separator tank;
A second connection line connecting the last oil tank and the separator tank; And
Air pollution and fire prevention system through oil vapor reduction and recovery, characterized in that it is provided on the second connection line and further comprises a second flashback preventer for preventing backfire.
The method of claim 3,
Air pollution through reduction and recovery of oil vapor, characterized in that it further comprises a system controller that controls the operation of the nitrogen generator and the bleed valve by an organic mechanism to reduce and recover the oil vapor that may occur in the oil tanks. And fire protection system.
A plurality of oil tanks provided independently of each other;
A plurality of individual supply lines respectively connected to the oil tanks and individually supplying the oil in the oil tank;
A plurality of bleed valves connected to the individual supply lines to be opened and closed;
A common supply line commonly connected to the individual supply lines;
An oil vapor reduction unit provided on the common supply line and configured to reduce oil vapor generated in the oil tank and passing through the common supply line;
A filter unit to which an end of the common supply line is coupled with respect to a direction in which oil is supplied;
A cooler provided on the common supply line and cooling oil directed to the filter unit through the common supply line;
A first backfire preventer provided on the common supply line and preventing backfire;
A nitrogen generator generating nitrogen (N2);
A first nitrogen line for supplying nitrogen from the nitrogen generator to the oil tanks;
A second nitrogen line branched from the first nitrogen line and supplying nitrogen from the nitrogen generator to the filter unit;
A nitrogen recovery line connected to the nitrogen generator and the filter unit and recovering the recovered nitrogen in the filter unit to the first nitrogen line;
A pressure relief valve provided on the nitrogen recovery line; And
An oil vapor liquid recovery line connected to the cooler and the last oil tank and recovering the oil vapor liquid that has passed the cooler to the last oil tank;
A separator tank disposed adjacent to the filter unit;
A first connection line connecting the filter unit and the separator tank;
A second connection line connecting the last oil tank and the separator tank;
A second backfire prevention device provided on the second connection line and preventing backfire; And
And a system controller for controlling the operation of the nitrogen generator and the bleed valve through an organic mechanism in order to reduce and recover the oil vapor that may occur in the oil tanks. Fire protection system. delete

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