KR102504745B1 - Flare stack deodorizing system and method for operating the same - Google Patents

Abstract

One embodiment of the present invention is a knockout drum for separating gas and liquid from the gas flowing into the interior; a buffer drum connected to the knockout drum and maintaining the pressure of the gas introduced from the knockout drum within a predetermined pressure range; a backflow prevention drum connected to the buffer drum and accommodating gas supplied from the buffer drum; a malodor removal unit removing malodor present in the gas flowing into the backflow prevention drum; and a flare stack that is connected to the backflow prevention drum and burns gas supplied from the backflow prevention drum.

Description

Flare stack deodorization system and its operating method {FLARE STACK DEODORIZING SYSTEM AND METHOD FOR OPERATING THE SAME}

The present invention relates to a flare stack deodorizing system and an operating method thereof, and more particularly, to a flare stack deodorizing system configured to prevent air pollution and an operating method thereof.

The flare stack is a chimney made for combustion treatment of VOCs (Volatile Organic Compounds), toxic gas, corrosive vapor, etc. generated from oil refineries/petrochemical plants and landfills.

1 is an exemplary view showing a conventional flare stack system.

As shown in FIG. 1, the flare stack system 10 is configured to process flare gas to be incinerated from various facilities. At this time, the gas supplied to the flare stack system 10 is not a pure gas, but a gas containing a large amount of impurities.

In this way, the knockout drum 1 provided in the flare stack system 10 removes moisture from the gas to be incinerated so that the flare gas can be better incinerated. The gas to be incinerated from which moisture has been removed in the knockout drum 1 is sent to the flare stack 3 through the backflow prevention drum 2 and incinerated.

However, abnormal operation that occasionally occurs in petrochemical and oil refinery ball tanks, reactors and distillation towers (power outages, process temperature rises, compression errors, overpressure due to atmospheric temperature rise in liquefied gas storage tanks) etc.) will cause overpressure and overcharging in the equipment. When overpressure and overcharging occur in such equipment, there is a risk of explosion.

To prevent such an explosion accident, a safety valve (PSV, Pressure Safety Valve) and a pressure control valve (PCV, Pressure Control Valve) are installed in the facility. and the pressure control valve are configured to send the gas to the flare stack (3), which is an incineration facility. At this time, a large amount of gas supplied to the flare stack 3 is directly discharged to the atmosphere without combustion treatment, or odor and soot are discharged to the atmosphere in a state of incomplete combustion, thereby polluting the atmospheric environment.

Such air pollution has a problem in that a large amount of odorous polluting gas is discharged into the atmosphere through the flare stack 3 until each process equipment such as a gas tank, a reaction tank, and a distillation column is normally operated.

Therefore, there is a need for various studies on a flare stack deodorization system and its operation method designed to prevent air pollution even when abnormal operation of each process facility occurs.

Prior Document 1: Korean Patent Registration No. 10-2085454 (2020.02.28)

A technical problem of the present invention for solving the above problems is to provide a flare stack deodorizing system and an operating method thereof to prevent air pollution.

In order to achieve the above technical problem, one embodiment of the present invention is a knock-out drum for separating gas and liquid from the gas flowing into the inside; a buffer drum connected to the knockout drum and maintaining the pressure of the gas introduced from the knockout drum within a predetermined pressure range; a backflow prevention drum connected to the buffer drum and accommodating gas supplied from the buffer drum; a malodor removal unit removing malodor present in the gas flowing into the backflow prevention drum; and a flare stack connected to the backflow prevention drum and combusting the gas supplied from the backflow prevention drum.

In one embodiment of the present invention, a first connection passage connecting the knockout drum and the buffer drum; and a second connection passage connecting the buffer drum and the backflow prevention drum, wherein the first connection passage may include a pressure sensor unit for measuring a pressure in the first connection passage.

In one embodiment of the present invention, the operation of the odor removal unit may be selectively controlled according to the pressure value measured by the pressure sensor unit.

In one embodiment of the present invention, when the pressure value measured by the pressure sensor unit is equal to or greater than a predetermined pressure value, the malodor removal unit is operated, and the odor removal unit measures the pressure measured from the pressure sensor unit while the operation unit is operating. When the pressure value is less than or equal to the predetermined pressure value, the operation of the malodor removal unit is stopped, and the predetermined pressure value of the pressure sensor unit for stopping operation of the odor removal unit is the pressure for operating the malodor removal unit. It may be set to a lower pressure value than a predetermined pressure value of the sensor unit.

In one embodiment of the present invention, when the pressure value measured from the pressure sensor unit is 0.5 kg/cm 2 or more, the odor removal unit operates, and the odor removal unit operates, and the pressure is measured from the pressure sensor unit in an operating state. When the pressure value obtained is 0.1 kg/cm 2 or less, the operation of the odor removal unit may be stopped.

The set pressure value of the pressure sensor unit may be changed according to gas discharge pressure conditions of the flare stack for each factory.

In one embodiment of the present invention, the odor removal unit may include a deodorant tank unit in which a deodorant is stored; a mixer unit receiving the deodorant from the deodorant tank unit; an advanced oxidation processing unit generating hydroxyl radicals and supplying the generated hydroxyl radicals to the mixer unit; a first control unit controlling supply of the deodorant from the deodorant tank unit to the mixer unit; a second control unit controlling the supply of hydroxyl radicals from the advanced oxidation processing unit to the mixer unit; and a nozzle unit receiving the deodorant and hydroxyl radical from the mixer unit and injecting and supplying the deodorant and hydroxyl radical into the backflow prevention drum.

In one embodiment of the present invention, the nozzle unit may be disposed in the upper and lower water inside the backflow prevention drum, and may be provided in plurality at predetermined intervals.

In one embodiment of the present invention, it is connected to the buffer drum, further comprising a gas recovery unit made to recover the gas present in the buffer drum, wherein the gas recovery unit according to the pressure value measured from the pressure sensor unit Operation of the gas recovery unit may be selectively performed.

One embodiment of the present invention is a) separating gas and liquid from the gas flowing into the knockout drum; b) supplying the separated gas from the knockout drum to a buffer drum; c) supplying the gas introduced into the buffer drum to the backflow prevention drum; and d) supplying gas introduced into the backflow prevention drum to a flare stack for combustion, wherein a pressure sensor for measuring a pressure of the first connection passage is located on a first connection passage connecting the knockout drum and the buffer drum. Provided is a flare stack deodorization system operating method in which an odor removal unit is provided and an odor removal unit for removing odors present in the gas flowing into the backflow prevention drum is selectively operated according to the pressure value measured by the pressure sensor unit. .

In one embodiment of the present invention, after step b), b') recovering the gas in the buffer drum to a gas recovery unit; further comprising the gas recovery unit based on the pressure value measured from the pressure sensor unit. It is selectively operated according to, and the gas pressure in the buffer drum can be adjusted.

The effects of the flare stack deodorizing system and its operating method according to the present invention described above are as follows.

According to the present invention, the flare stack deodorization system can prevent air pollution by automatically operating the odor removal unit when abnormal operation of each process facility occurs.

In other words, a pressure sensor unit for measuring the pressure of the first connection channel is provided on the first connection flow path connecting the knockout drum and the buffer drum, and when the pressure value measured from the pressure sensor unit is greater than or equal to a predetermined pressure value, the backflow prevention drum It is possible to prevent atmospheric environmental pollution from occurring by operating an odor removal unit that removes odors present in the gas flowing into the gas.

In addition, the flare stack deodorization system includes a gas recovery unit that recovers gas present in the buffer drum, so that a large amount of gas can be prevented from being supplied to the flare stack in an abnormal operating state.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is an exemplary view showing a conventional flare stack system.
2 is an exemplary diagram illustrating a flare stack system according to an embodiment of the present invention.
3 is an operating state diagram of a flare stack system showing a state in which a gas recovery unit and an odor removal unit are operated according to an embodiment of the present invention.
4 is an operating state diagram of a flare stack system showing a state in which a gas recovery unit and an odor removal unit are stopped according to an embodiment of the present invention.
5 is a flowchart illustrating an operating method of a flare stack system according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and, therefore, is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another member interposed therebetween. . In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

In the present invention, the upper and lower parts mean that they are located above or below the object member, and do not necessarily mean that they are located above or below the gravitational direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exemplary diagram showing a flare stack system according to an embodiment of the present invention, and FIG. 3 is an operating state diagram of the flare stack system showing a state in which a gas recovery unit and an odor removal unit are operated according to an embodiment of the present invention. 4 is an operating state diagram of the flare stack system showing a state in which the gas recovery unit and the odor removal unit are stopped in operation according to an embodiment of the present invention.

2 to 4, the flare stack deodorization system 1000 includes a knockout drum 100, a buffer drum 200, a gas recovery unit 300, a backflow prevention drum 400, and an odor removal unit 500 and a flare stack 600 .

Here, the knockout drum 100 is formed to collect flare gas to be incinerated from various facilities such as petrochemical, oil refinery gas tanks, reaction tanks, and distillation towers.

In this way, moisture can be removed from the gas collected in the knockout drum 100 . That is, the knockout drum 100 is configured to separate gas and liquid from gases introduced into the inside.

The liquid collected at the bottom of the knockout drum 100 through the gas and liquid separation process of the knockout drum 100 may be, for example, water and oil, and these water and oil are transferred to the outside through a drain and reused. may be In this way, the knockout drum 100 is configured to prevent liquid from flowing into the flare stack 600 .

And the buffer drum 200 is configured to receive gas from the knockout drum 100 . Here, the knockout drum 100 and the buffer drum 200 are connected by the first connection passage 610, so gas can be supplied from the knockout drum 100 to the buffer drum 200.

The buffer drum 200 is disposed between the knockout drum 100 and the backflow prevention drum 400 .

In such a buffer drum 200, a large amount of gas flows into the knockout drum 100 due to abnormal operation of each process facility (power outage, process temperature rise, compression mistake, overpressure due to atmospheric temperature rise in the liquefied gas storage tank, etc.) In the process of being supplied to the backflow prevention drum 400 via the buffer drum 200, the supply amount of the gas supplied to the backflow prevention drum 400 is maintained constant.

Such a buffer drum 200 is provided with an internal space having a certain size or more, so that even if a large amount of gas is rapidly introduced, the pressure of the introduced gas is prevented from being rapidly increased. The buffer drum 200 may be made to have a size of 100 lubes, for example.

And the buffer drum 200 maintains the pressure of the gas introduced from the knockout drum 100 within a predetermined pressure range, and is made so that a certain amount of gas can be uniformly supplied to the backflow prevention drum 400.

The gas recovery unit 300 may be coupled to the buffer drum 200 as described above.

When a large amount of gas rapidly flows into the buffer drum 200, the gas recovery unit 300 recovers the gas present in the buffer drum 200 so that the internal pressure of the buffer drum 200 is within a predetermined pressure range. It is made to adjust the gas pressure in the buffer drum 200 so as to be maintained. Accordingly, a large amount of gas is prevented from being rapidly supplied from the buffer drum 200 to the backflow prevention drum 400 .

In the gas recovery unit 300, the operation of the third control unit 310 is selectively performed according to the pressure value measured by the pressure sensor unit 630, and the gas in the buffer drum 200 is transferred to the gas recovery unit 300. can be infiltrated. The operation of the third controller 310 will be described later.

On the other hand, the backflow prevention drum 400 is configured to receive gas introduced from the buffer drum 200 . Here, the buffer drum 200 and the backflow prevention drum 400 are connected by the second connection passage 620 so that gas can be supplied from the buffer drum 200 to the backflow prevention drum 400 .

The reverse flow prevention drum 400 is configured to prevent a flash back phenomenon in which the flame of the flare stack 600 flows backward. The backflow prevention drum 400 maintains a positive pressure in the flare stack deodorization system 1000 to prevent backfire from being introduced into the flare stack 600 from the outside.

In addition, the odor removal unit 500 is configured to remove odor present in the gas flowing into the backflow prevention drum 400 .

The odor removal unit 500 is made to operate when a large amount of gas flows into the backflow prevention drum 400 due to abnormal operation of each process facility, such as a gas tank, a reaction tank, and a distillation column. In other words, in a situation where the gas supplied from the backflow prevention drum 400 to the flare stack 600 is completely burned, the malodor removal unit 500 may not operate at all.

The odor removal unit 500 includes a deodorant tank unit 510, an advanced oxidation treatment unit 520, a mixer unit 530, a first control unit 540, a second control unit 550, and a nozzle unit 560. can do.

Here, a deodorant is stored in the deodorant tank unit 510 . This deodorant is sprayed and supplied to the inside of the backflow prevention drum 400 through, for example, the nozzle unit 560, and the odor pollutant gas, volatile organic compound (VOC), hydrocarbon (THC) gas, and other complex odor gases It may be a deodorant made to remove odor through a chemical reaction.

And the advanced oxidation treatment unit 520 is configured to generate hydroxyl radical (OH). The hydroxyl radicals generated from the advanced oxidation treatment unit 520 are sprayed and supplied to the inside of the backflow prevention drum 400 through the nozzle unit 560 to remove odors through oxidation reactions of various recalcitrant pollutants.

The mixer unit 530 is connected to the deodorant tank unit 510 and the advanced oxidation treatment unit 520, respectively, and increases the deodorant supplied from the deodorant tank unit 510 and the hydroxyl radical supplied from the advanced oxidation treatment unit 520. It is activated as a deodorant with strong oxidizing power and supplied to the nozzle unit 560.

The nozzle unit 560 is provided inside the backflow prevention drum 400 . The nozzle unit 560 is disposed in the water inside the upper and lower parts of the backflow prevention drum 400, and is provided in plural at predetermined intervals to spray a deodorant and hydroxyl radicals to the entire inside of the backflow prevention drum 400. will spray

The first control unit 540 is configured to control the supply of the deodorant supplied from the deodorant tank unit 510 to the mixer unit 530 .

The second control unit 550 controls the supply of hydroxyl radicals supplied from the advanced oxidation unit 520 to the mixer unit 530.

The first control unit 540 and the second control unit 550 perform selective operation according to the pressure value measured from the pressure sensor unit 630 installed on the first connection passage 610 . Here, the pressure sensor unit 630 is configured to measure the pressure in the first connection passage 610 .

As such, the odor removal unit 500 may be selectively operated according to the pressure value measured by the pressure sensor unit 630 . That is, when the pressure value measured by the pressure sensor unit 630 is greater than or equal to a predetermined pressure value, the odor removal unit 500 may operate.

For example, when the pressure value measured by the pressure sensor unit 630 is 0.5 kg/cm 2 or more, the odor removal unit 500 may be set to operate. In this case, the preset pressure setting value of the pressure sensor unit 630 for the operation of the odor removal unit 500 may be a pressure value determined as a large amount of gas flowing into the first connection passage 610 .

As such, when the pressure value measured by the pressure sensor unit 630 is equal to or greater than a predetermined pressure value, the first control unit 540 and the second control unit 550 operate, and the mixer unit 530 provides a deodorant and a hydroxyl agent. A supply of radicals can be made.

In addition, when the pressure value measured by the pressure sensor unit 630 falls below 0.1 kg/cm 2 while the odor removal unit 500 is operating, the operation of the odor removal unit 500 may be stopped. The set pressure value of the pressure sensor unit 630 may be changed according to gas discharge pressure conditions of the flare stack 600 for each factory. Here, the predetermined pressure set value for stopping the operation of the odor removal unit 500 may be a pressure value determined to allow complete combustion when the gas flowing into the first connection passage 610 is supplied to the flare stack 600. .

Here, the pressure value of the pressure sensor unit 630 for operating the odor removal unit 500 and the pressure value of the pressure sensor unit 630 for stopping the operation of the odor removal unit 500 are not set to the same value. . In other words, the pressure value of the pressure sensor unit 630 for stopping the operation of the odor removal unit 500 is a lower pressure value than the pressure value of the pressure sensor unit 630 for operating the odor removal unit 500. It is desirable to set This is because odor treatment must be performed while the gas at the time when the pressure value of the pressure sensor unit 630 is measured passes through the buffer drum 200 and the backflow prevention drum 400 .

Here, in addition to the first controller 540 and the second controller 550 according to the pressure value measured by the pressure sensor unit 630, the third controller configured to introduce gas in the buffer drum 200 into the gas recovery unit 300 ( 310) may be performed in the same way as the first control unit 540 and the second control unit 550.

Here, the first control unit 540, the second control unit 550, and the third control unit 310 may be composed of various power providing means such as, for example, a motor, a pump, a compressor, and the like, and the first control unit 540, The second control unit 550 and the third control unit 310 are operated in conjunction with the pressure value measured by the pressure sensor unit 630 .

In this way, the pressure sensor unit 630 is provided to the first control unit 540 to the third control unit 310 so that information on the pressure value measured by the pressure sensor unit 630 can be provided to the odor removal unit 500 and A communication connection with the gas recovery unit 300 may be made.

At this time, the pressure sensor unit 630, the odor removal unit 500, and the gas recovery unit 300 may transmit information in a wired or wireless form. The pressure sensor unit 630, the odor removal unit 500, and the gas recovery unit 300 convert data into an Internet protocol using various wired and wireless communication technologies such as an Internet network, an intranet network, a mobile communication network, and a satellite communication network. It may be made to enable transmission and reception.

Here, the communication network includes not only closed networks such as LAN (Local Area Network) and WAN (Wide Area Network), but also open networks such as the Internet, as well as home networks and wireless sensor networks mainly based on two-way wireless personal area networks (WPANs). Networks such as Zigbee, CDMA (Code Division Multiple Access), WCDMA (Wideband Code Division Multiple Access), GSM (Global System for Mobile Communications), LTE (Long Term Evolution), EPC (Evolved Packet Core), etc. It may be a concept that collectively refers to a next-generation network and a computing network to be implemented in the future.

5 is a flowchart illustrating an operating method of a flare stack system according to an embodiment of the present invention.

Referring schematically to the operation method of the flare stack system through FIG. 5 , first, the gas introduced into the knockout drum 100 is separated into a gas and a liquid. (S1000)

Next, the gas separated from the knockout drum 100 is supplied to the buffer drum 200 . (S2000)

Next, the gas introduced into the buffer drum 200 is supplied to the backflow prevention drum 400 . (S3000)

Here, the pressure sensor unit 630 installed on the first connection passage 610 connecting the knockout drum 100 and the buffer drum 200 measures the pressure in the first connection passage 610 . At this time, when the pressure value measured by the pressure sensor unit 630 is greater than or equal to a predetermined pressure value, the pressure of the gas in the buffer drum 200 is lowered through the operation of the gas recovery unit 300, and the odor removal unit ( Odors in the backflow prevention drum 400 may be removed through the operation of 500 . (S2100, S3100)

The odor removal unit 500 as described above primarily removes 30% of odor pollutants such as volatile organic compounds (VOC), hydrocarbon (THC) gas, and other complex odor gases existing in the backflow prevention drum 400 through chemical reactions. It is made to remove more than ~ 40% of odor.

And, when the pressure value measured by the pressure sensor unit 630 falls below a predetermined pressure value while the odor removal unit 500 is operating, the operation of the gas recovery unit 300 and the odor removal unit 500 is stopped. It can be.

Finally, the gas introduced into the backflow prevention drum 400 is supplied to the flare stack 600 to be burned. (S4000)

In the flare stack deodorization system 1000, a large amount of gas is introduced into the knockout drum 100 and discharged to the flare stack 600 when an abnormal operation of each process facility occurs, and the gas recovery unit 300 and odor removal By automatically operating the rejection 500, it is made to prevent air pollution from occurring.

However, this is only a preferred embodiment of the present invention, and the scope of the present invention is not limited by the description scope of these embodiments.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

100: knockout drum
200: buffer drum
300: gas recovery unit
310: third control unit
400: backflow prevention drum
500: odor removal unit
510: deodorant tank unit
520: advanced oxidation treatment unit
530: mixer unit
540: first controller
550: second control unit
560: nozzle part
600: flare stack
610: first connection passage
620: second connection passage
630: pressure sensor unit
1000: flare stack deodorization system

Claims (10)

A knockout drum separating gas and liquid from the gas flowing into the inside;
a buffer drum connected to the knockout drum and maintaining the pressure of the gas introduced from the knockout drum within a predetermined pressure range;
a backflow prevention drum connected to the buffer drum and accommodating gas supplied from the buffer drum;
a first connection passage connecting the knockout drum and the buffer drum;
a second connection passage connecting the buffer drum and the backflow prevention drum;
a malodor removal unit removing malodor present in the gas flowing into the backflow prevention drum; and
A flare stack connected to the backflow prevention drum and combusting the gas supplied from the backflow prevention drum,
The first connection passage is provided with a pressure sensor unit for measuring the pressure in the first connection passage, and the operation of the odor removal unit is selectively controlled according to the pressure value measured by the pressure sensor unit.
When the pressure value measured by the pressure sensor unit is greater than or equal to a predetermined pressure value, the odor removal unit is operated, and when the pressure value measured by the pressure sensor unit is less than or equal to a predetermined pressure value while the odor removal unit is operating The operation of the odor removal unit is stopped, and the predetermined pressure value of the pressure sensor unit for stopping the operation of the odor removal unit is higher than the predetermined pressure value of the pressure sensor unit for operating the odor removal unit. A flare stack deodorization system that is set to a low pressure value.
delete delete delete According to claim 1,
When the pressure value measured by the pressure sensor unit is 0.5 kg/cm 2 or more, the odor removal unit operates,
The flare stack deodorization system according to claim 1 , wherein the operation of the odor removal unit is stopped when the pressure value measured by the pressure sensor unit is 0.1 kg/cm 2 or less while the odor removal unit is operating.
According to claim 1,
The odor removal unit,
a deodorant tank unit in which deodorant is stored;
a mixer unit receiving the deodorant from the deodorant tank unit;
an advanced oxidation treatment unit generating hydroxyl radicals and supplying the generated hydroxyl radicals to the mixer unit;
a first control unit controlling supply of the deodorant from the deodorant tank unit to the mixer unit;
a second control unit controlling the supply of hydroxyl radicals from the advanced oxidation processing unit to the mixer unit; and
and a nozzle unit receiving the deodorant and hydroxyl radicals from the mixer unit and injecting and supplying the deodorant and hydroxyl radicals into the backflow prevention drum.
According to claim 6,
The flare stack deodorization system, characterized in that the nozzle unit is disposed in the upper and lower water inside the backflow prevention drum, and is provided in plurality at a predetermined interval.
According to claim 1,
Further comprising a gas recovery unit connected to the buffer drum and configured to recover gas present in the buffer drum,
The gas recovery unit flare stack deodorization system, characterized in that the operation of the gas recovery unit is selectively performed according to the pressure value measured from the pressure sensor unit.
a) separating gas and liquid from the gas flowing into the knockout drum;
b) supplying the separated gas from the knockout drum to a buffer drum;
c) supplying the gas introduced into the buffer drum to the backflow prevention drum; and
d) supplying the gas introduced into the backflow prevention drum to a flare stack to burn it;
A pressure sensor unit for measuring the pressure of the first connection channel is provided on a first connection passage connecting the knockout drum and the buffer drum, and the gas flowing into the backflow prevention drum is controlled according to the pressure value measured by the pressure sensor unit. The operation of the odor removal unit for removing the existing odor is selectively controlled,
When the pressure value measured by the pressure sensor unit is greater than or equal to a predetermined pressure value, the odor removal unit is operated, and when the pressure value measured by the pressure sensor unit is less than or equal to a predetermined pressure value while the odor removal unit is operating The operation of the odor removal unit is stopped, and the predetermined pressure value of the pressure sensor unit for stopping the operation of the odor removal unit is higher than the predetermined pressure value of the pressure sensor unit for operating the odor removal unit. A method of operating a flare stack deodorization system that is set to a low pressure value.
According to claim 9,
After step b),
b') recovering the gas in the buffer drum to a gas recovery unit; further comprising,
The gas recovery unit is selectively operated according to the pressure value measured by the pressure sensor unit and controls the gas pressure in the buffer drum.

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