KR102324814B1 - Volatile Organic Compound Recovery System - Google Patents

Abstract

A volatile organic compound recovery system according to an embodiment of the present disclosure includes a VOC inlet unit, a first condensing unit, a first distribution module, a second condensing unit, a second distribution module, a liquid nitrogen supply unit, a condensed VOC storage unit, a nitrogen separation unit, and a VOC discharge unit. The present invention can recover VOC in gas discharged into the air.

Description

Volatile Organic Compound Recovery System {Volatile Organic Compound Recovery System}

The present disclosure relates to a volatile organic compound recovery system, and more particularly, to a volatile organic compound recovery system for condensing and recovering volatile organic compounds using cryogenic liquid nitrogen.

Volatile Organic Compounds (VOCs) are emitted from various pollutants, such as mobile pollutants that use fuel, fixed emission sources that use solvents such as production and manufacturing processes, and painting facilities.

These VOCs contain hydrocarbon components such as methane and ethane and other components such as oxygen, nitrogen, carbon dioxide, and hydrogen sulfide, and about 60 ~ It may contain 70% nitrogen component.

In a facility that uses organic solvents, the process operation cycle is irregular and instantaneous, and VOCs are generated in a wide range of concentrations from high to low concentrations, but their occurrence time is tens of minutes. Currently, there are various methods used to treat VOCs, such as combustion, absorption, adsorption, condensation, and biological treatment. In particular, facilities that directly use organic solvents emit high-concentration VOCs, and the method of selecting recovery rather than removal is effective. In addition, the limitations of the existing process are clearly shown in facilities that discharge from high concentration to low concentration in a short period of time.

The cooling and condensation process is a method of recovering liquid at a low temperature by using the difference in vapor pressure according to the temperature of the material to be treated. There is a limit to maintaining efficiency, and there are problems in that maintenance is difficult and operation cost is also high.

US 101359569 B1 US 101516169 B1 US 101148070 B1 US 1020200078676 A

The volatile organic compound recovery system according to an embodiment of the present disclosure was created to improve the conventional problems as described above, and by rapidly cooling and condensing the VOC using liquid nitrogen, a volatile organic compound capable of recovering VOC in atmospheric exhaust gas An object of the present invention is to provide an organic compound recovery system.

A volatile organic compound recovery system according to an embodiment of the present disclosure for solving the above problems,

a VOC inlet 100 for introducing a process gas containing a volatile organic compound (hereinafter, VOC); The first condensing unit 200 is connected to the VOC inlet 100 to receive process gas, and cools the process gas to condense the VOC included in the process gas. ); a first distribution module 300 connected to the first condensing unit 200 to separate and discharge VOC and process gas condensed in the first condensing unit 200; A second condensing unit ( 400); a second distribution module 500 connected to the second condensing unit 400 to separate and discharge VOC and process gas condensed in the second condensing unit 400; a liquid nitrogen supply unit 600 connected to the first condensing unit 200 and the second condensing unit 400 and supplying low-temperature liquid nitrogen to the first condensing unit 200; a condensed VOC storage unit 700 connected to the first distribution module 300 and the second distribution module 500 and receiving and storing the condensed VOC from the distribution modules 300 and 500; a nitrogen separation unit 800 connected to the second distribution module 500 to receive a process gas, and to separate and discharge nitrogen from the process gas; and a VOC discharge unit 900 that receives a process gas from which nitrogen is separated from the nitrogen separation unit 800 and determines whether the process gas is discharged. including,
The first condensing unit 200 and the second condensing unit 400 include a gas-liquid separation module, and vaporized nitrogen by heat exchange with the process gas introduced into the condensing units 200 and 400 . separated and supplied to the liquid nitrogen supply unit 600,
The first condensing unit 200 and the second condensing unit 400 are provided with at least one refrigerant transfer pipe through which cryogenic liquid nitrogen is moved therein, and the process gas introduced into the condensing units 200 and 400 . (Process Gas) is indirectly cooled by cryogenic liquid nitrogen moving the refrigerant transfer pipe, characterized in that the VOC contained in the process gas (Process Gas) is condensed,
The first condensing unit 200, the second condensing unit 400, and the liquid nitrogen supply unit 600 are connected to each other so that the low-temperature liquid nitrogen supplied from the liquid nitrogen supply unit 600 is converted into the first condensing unit ( 200) and the second condensing unit 400 and the liquid nitrogen supply unit 600, characterized in that it circulates,
The liquid nitrogen supply unit 600 includes a separate cooling and storage system, so that the nitrogen vaporized in the first condensing unit 200 and the second condensing unit 400 and the nitrogen separated in the nitrogen separating unit 800 are separated. is supplied to liquefy gaseous nitrogen and supplied to the first condensing unit 200,
The nitrogen separation unit 800 is characterized in that it includes any one of a PSA (Pressure Swing Absorption) method or a Membrane method,
The VOC discharge unit 900 includes a concentration detection module for detecting the VOC concentration of the provided process gas, and when the sensed VOC concentration value is less than or equal to a preset concentration value, the process gas It is discharged to the atmosphere, and when the detected VOC concentration value exceeds a preset concentration value, the process gas is moved back to the VOC inlet 100 ,
The VOC discharge unit 900 further includes a noise removal unit for increasing precision by removing the noise of the concentration sensing module, and the noise removal unit samples data containing noise at predetermined time intervals, and the sampled data Compared with the data sampled immediately before that, if the difference between the values is within a predetermined range, the data sampled later is adopted, and if the difference between the values is out of the predetermined range, the data sampled immediately before and configured to accept data.

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Accordingly, the volatile organic compound recovery system according to an embodiment of the present disclosure,

Since liquid nitrogen and VOC do not come into direct contact, condensed VOC and vaporized nitrogen have the advantage that they can be recycled, there is no wastewater generation, there is no additional pollution such as acid and dioxin, and there is no ignition source, so it is easy to construct explosion-proof facilities. There is an advantage.

In addition, since the equipment configuration is simple and operation is simple, there is an advantage in that it is possible to reduce the number of operating personnel and facilitate maintenance, and to reduce the operation cost by reusing the vaporized nitrogen.

In addition, since it can be installed in all stages of the existing absorption and adsorption facilities and used together, there is an advantage of great utility.

1 is a schematic diagram illustrating a volatile organic compound recovery system according to an embodiment of the present disclosure;
2 is a view for specifically explaining noise removal according to an embodiment of the present disclosure;
3 is a flowchart showing a volatile organic compound recovery method according to an embodiment of the present disclosure;
4 and 5 are flowcharts specifically illustrating step S107 of FIG. 2 .

Hereinafter, the technical spirit of the present invention will be described with reference to the drawings, but this is for easier understanding, and the scope of the present invention is not limited thereto, and the present invention is only defined by the scope of the claims.

In describing the embodiment of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted, and the same reference numerals refer to the same components throughout the specification. refers to the element.

In the following examples, the volatile organic compound is referred to as VOC, and the gas containing VOC is referred to as a process gas, and VOC is a hydrocarbon component such as methane and ethane and oxygen, It contains other components such as nitrogen, carbon dioxide, and hydrogen sulfide, and may contain about 60 to 70% of the nitrogen component.

1 is a schematic diagram illustrating a volatile organic compound recovery system according to an embodiment of the present disclosure, FIG. 2 is a view for specifically explaining noise removal according to an embodiment of the present disclosure, and FIG. 3 is an implementation of the present disclosure A flow chart showing a method for recovering a volatile organic compound according to an example, FIGS. 4 and 5 are flowcharts specifically illustrating step S107 of FIG. 2 .

<Volatile organic compound recovery system according to an embodiment of the present disclosure>

1 , the volatile organic compound recovery system according to an embodiment of the present disclosure includes a VOC inlet 100 , a first condensing unit 200 , a first distribution module 300 , a second condensing unit 400 , It may be configured to include a second distribution module 500 , a liquid nitrogen supply unit 600 , a condensed VOC storage unit 700 , a nitrogen separation unit 800 , and a VOC discharge unit 900 .

The VOC inlet 100 is for introducing a process gas containing a volatile organic compound (hereinafter, VOC), and a flow control damper ( not shown) may be included.

In addition, the VOC inlet 100 may include a filter module (not shown) for removing foreign substances such as dust from the flowing process gas.

Such a filter module may be provided with a plurality of filters for filtering according to particle size, for example, may be configured by sequentially arranging a nonwoven fabric filter, a medium filter, a HEPA filter, and the like.

On the other hand, the VOC inlet 100 may further include a concentration module (not shown) for concentrating the process gas (Process Gas) to make a high-concentration VOC.

The concentration module may be configured to concentrate more than a certain amount of the inflow of the process gas and discharge the remaining amount, specifically, it may be configured to concentrate more than 90% and discharge treatment for the remaining less than 10% have. It is preferable to use a rota-rotary concentrator as such a concentration module, but is not necessarily limited thereto.

Also, the VOC inlet 100 may include at least one blower for supplying process gas to a condenser or the like.

The first condensing unit 200 is connected to the VOC inlet 100 to receive process gas, and cools the process gas to VOC contained in the process gas. For condensing the , the first condensing unit 200 is preferably formed in a vertical structure, and a plurality of refrigerant moving pipes may be provided inside the first condensing unit 200 .

Cryogenic liquid nitrogen (LIN) is moved through the refrigerant moving pipe, and the process gas introduced into the first condensing unit 200 is cryogenic liquid nitrogen ( Liquid Nitrogen, LIN) may be indirectly cooled to condense VOCs included in the process gas (Process Gas).

On the other hand, the first condensing unit 200 is connected to a second condensing unit 400 to be described later and a liquid nitrogen supplying unit 600 to be described later, and liquid nitrogen supplied from the liquid nitrogen supplying unit 600 (Liquid Nitrogen, LIN). may be configured to circulate and move through the first condensing unit 200 , the second condensing unit 400 , and the liquid nitrogen supply unit 600 .

In addition, the first condensing unit 200 may include a separate gas-liquid separation module (not shown). The gas-liquid separation module is connected to the refrigerant transfer pipe, and is configured to separate and discharge nitrogen (Gas Nitrogen, GAN) vaporized by heat exchange with the process gas introduced into the first condensing unit 200. can The gaseous nitrogen (Gas Nitrogen, GAN) discharged in this way can be reused in the liquid nitrogen supply unit 600 or configured to be used in a separate refrigeration or air conditioning system, so operating costs through the reuse of vaporized nitrogen (Gas Nitrogen, GAN) savings can be obtained.

The first distribution module 300 is connected to the first condensing unit 200 to separate and discharge VOC and process gas condensed in the first condensing unit 200, and the first The distribution module 300 may be configured to be connected to a condensed VOC storage unit 700 to be described later with a condensation line, and to be connected to a second condensed unit 400 to be described later with a non-condensed line.

Specifically, the VOC condensed in the first condensing unit 200 is moved along the condensing line by the first distribution module 300 to be stored in the condensed VOC storage unit 700, and includes uncondensed VOC. Processes Gas may be configured to be moved along the non-condensed line by the first distribution module 300 and cooled again in the second condensing unit 400 .

On the other hand, although the first distribution module 300 has been described as being configured separately from the first condensing unit 200 , it is not limited thereto, and of course, it may be configured as one integrally with the first condensing unit 200 . .

The second condensing unit 400 is connected to the first distribution module 300 to receive a process gas, and cools the process gas to be contained in the process gas. As for condensing VOC, the second condensing unit 400 is also preferably formed in a vertical structure like the first condensing unit 200 , and a plurality of refrigerant moving pipes are provided inside the second condensing unit 400 . can be provided.

Similarly, cryogenic liquid nitrogen (LIN) moves through the refrigerant moving pipe, and the process gas introduced into the second condensing unit 400 is cryogenic liquid nitrogen that moves through the refrigerant moving pipe. It may be configured to be indirectly cooled by the VOC contained in the process gas (Process Gas) is condensed.

In addition, the second condensing unit 200 is connected to the above-described first condensing unit 200 and a liquid nitrogen supply unit 600 to be described later, and liquid nitrogen supplied from the liquid nitrogen supply unit 600 (Liquid Nitrogen, LIN). may be configured to circulate and move through the first condensing unit 200 , the second condensing unit 400 , and the liquid nitrogen supply unit 600 .

In addition, the second condensing unit 400 may include a separate gas-liquid separation module (not shown), wherein the gas-liquid separation module is connected to the refrigerant transfer pipe and introduced into the second condensing unit 400 . It may be configured to separate and discharge nitrogen (Gas Nitrogen, GAN) vaporized by heat exchange with a process gas.

The gaseous nitrogen (Gas Nitrogen, GAN) discharged in this way can be reused in the liquid nitrogen supply unit 600 or configured to be used in a separate refrigeration or air conditioning system, so operating costs through the reuse of vaporized nitrogen (Gas Nitrogen, GAN) savings can be obtained.

The second distribution module 500 is connected to the second condensing unit 400 to separate and discharge VOC and process gas condensed in the second condensing unit 400, and the second The distribution module 400 may be configured to be connected to a condensed VOC storage unit 700 to be described later and a condensation line, and to be connected to a nitrogen separation unit 800 to be described later and a non-condensed line.

Specifically, the VOC condensed in the second condensing unit 400 is moved along the condensing line by the second distribution module 500 to be stored in the condensed VOC storage unit 700, and includes uncondensed VOC. Process gas may be configured to be moved to the nitrogen separation unit 800 along the non-condensed line by the second distribution module 500 .

Meanwhile, although the second distribution module 500 has been described as being configured separately from the second condensing unit 400 like the first distribution module 300, it is not limited thereto, and the second condensing unit 400 and Of course, it may be integrally configured as one.

The liquid nitrogen supply unit 600 is connected to the first condensing unit 200 and the second condensing unit 400 to supply low-temperature liquid nitrogen to the first condensing unit 200, the liquid The nitrogen supply unit 600 is provided with a separate cooling and storage system (not shown) to liquefy gaseous nitrogen to store liquid nitrogen below -196° C. and to supply it to the first condensing unit 200 . can

On the other hand, the liquid nitrogen supply unit 600 has been described as supplying low-temperature liquid nitrogen to the above-described first condensing unit 200, but is not limited thereto, and the above-described second condensing unit 400 or the above-mentioned first It may be configured to supply low-temperature liquid nitrogen (LIN) to the condensing unit 200 and the aforementioned second condensing unit 400 .

In addition, the liquid nitrogen supply unit 600 may be configured to receive nitrogen vaporized from the first condensing unit 200 and the second condensing unit 400 to be reused, as well as a nitrogen separation unit 800 to be described later. ) may be configured to be reused by receiving nitrogen from it.

The condensed VOC storage unit 700 is connected to the first distribution module 300 and the second distribution module 500 to receive and store the condensed VOC from the distribution modules 300 and 500 . .

The condensed VOC storage unit 700 may be configured to supply the condensed VOC by being connected to a consumer of the condensed VOC.

On the other hand, the condensed VOC storage unit 700 may include a separate cooling module (not shown) to prevent the condensed VOC from being vaporized again, and the cooling module is vaporized in the condensers 200 and 400 described above. It may be configured to cool the condensed VOC storage unit 700 using the nitrogen.

The nitrogen separation unit 800 may be configured to be connected to the second distribution module 500 to receive a process gas, and to separate nitrogen from the process gas and discharge it.

The nitrogen separation unit 800 includes any one of a PSA (Pressure Swing Absorption) method for separating nitrogen components by an adsorption rate difference using pressure fluctuations or a Membrane method for separating nitrogen components by a permeation rate difference. can be

In addition, the nitrogen separated by the nitrogen separation unit 800 may be supplied to the liquid nitrogen supply unit 600 described above, or may be configured to be supplied to a separate refrigeration system or the like.

On the other hand, the nitrogen separation unit 800 may be configured to supply a process gas from which nitrogen is separated by being connected to a VOC discharge unit 900 to be described later.

The VOC discharge unit 900 may be configured to receive a process gas in which nitrogen is separated from the nitrogen separation unit 800 and determine whether the process gas is discharged.

Specifically, the VOC discharge unit 900 may include a concentration detection module (not shown) for detecting the VOC concentration of the provided process gas, and the VOC concentration value detected by the concentration detection module is When the concentration value is less than the set concentration value, the process gas is discharged to the atmosphere, and when the sensed VOC concentration value exceeds the preset concentration value, the process gas is introduced into the VOC inlet (100). It can be configured to move back to

On the other hand, the volatile organic compound recovery system according to the present disclosure may further include a sensor for sensing temperature, pressure, or concentration in a pipeline connecting each component, and a control valve interlocking with the sensor may be further provided. is of course

The control valve may be configured to sense and adjust the flow rate. For example, the control valve may include a body unit, a flow rate sensor, a flow rate control unit, a gear unit, and a lever unit.

The body unit is provided with an inlet and an outlet, a flow path communicating with the inlet and the outlet is formed therein, and the flow sensor detects a flow rate flowing through the flow path.

The flow rate control unit may be slidably installed inside the body unit in which the flow path is formed, and selectively open and close the flow path during sliding movement to adjust the flow rate of the fluid passing through the flow path.

The gear unit is coupled to a side surface of the body unit, and has a gear body coupled to the flow rate control unit therein so that the flow rate control unit slides in the body unit.

The lever unit has one end coupled to the gear body, the other end is connected to a rotation shaft rotatably provided in the gear unit, and rotates the rotation shaft by an external force so that the fluid passing through the flow path passes at a set flow rate. The flow control unit is controlled.

On the other hand, by further comprising a driving unit connected to the lever unit may be configured to remotely operate the lever unit by a predetermined signal.

In addition, of course, the control valve may be configured to control the optimal flow rate based on temperature, pressure, concentration, and the like.

In addition, it may be configured to further include a monitoring device capable of integrally monitoring by receiving data of the temperature, pressure, or concentration of the fluid or gas in the pipeline.

In addition, each pipeline may be configured to further include a noise removal unit for more precise detection of each sensor.

Referring to FIG. 2 , for example, the noise removing unit samples data including noise at predetermined time intervals, and compares the sampled data with data sampled immediately before that to determine a difference between the values. If it is within the range, data sampled later is adopted, and when the difference between the values is out of a predetermined range, data sampled immediately before may be adopted.

Specifically, when the predetermined range is A, if the absolute value of the difference between the sampled data is smaller than A, the data sampled later is determined to be free of noise and adopted, but the absolute value of the difference between the sampled data is larger than A In this case, it may be configured to adopt the previously sampled data rather than determining that the data sampled later contains noise.

On the other hand, the absolute value of the difference between the sampling time interval and the data can be changed, and noise may be removed by using a bandpass filter generally used for signal processing.

<Volatile organic compound recovery method according to an embodiment of the present disclosure>

3 to 5, the volatile organic compound volatilization method according to an embodiment of the present disclosure,

The process gas (Process Gas) containing the volatile organic compound is introduced by the VOC inlet 100 (S101); Condensing the VOC contained in the process gas (Process Gas) by cooling the introduced process gas (Process Gas) in the first condensing unit 200 (S102); The VOC condensed in the first condensing unit 200 by the first distribution module 300 is discharged to the condensed VOC storage unit 700 , and the process gas is discharged to the second condensing unit 400 . step (S103); cooling the process gas introduced from the second condensing unit 400 to condense the VOC contained in the process gas (S104); VOC condensed in the second condensing unit 400 by the second distribution module 500 is discharged to the condensed VOC storage unit 700 , and the process gas is discharged to the nitrogen separating unit 800 . (S105); After nitrogen of the process gas introduced by the nitrogen separation unit 800 is separated, the nitrogen-separated process gas (Process Gas) is discharged to the VOC discharge unit 900 (S106); and determining whether the process gas introduced from the VOC discharge unit 900 is discharged (S107); It may be configured as comprising a.

Meanwhile, referring to FIG. 4 , the step S107 is

Detecting the VOC concentration of the process gas (Process Gas) (S107a); comparing the sensed VOC concentration value with a preset concentration value (S107b); and discharging the process gas to the atmosphere when the sensed VOC concentration value is less than or equal to a preset concentration value (S107c); It may be configured as comprising a.

In addition, referring to FIG. 5 , the step S107 is

Detecting the VOC concentration of the process gas (Process Gas) (S107a); comparing the sensed VOC concentration value with a preset concentration value (S107b); and moving the process gas to the VOC inlet 100 when the sensed VOC concentration value exceeds a preset concentration value (S107d); It may be configured as comprising a.

Accordingly, the volatile organic compound recovery system and method according to an embodiment of the present disclosure,

Since liquid nitrogen and VOC do not come into direct contact, condensed VOC and vaporized nitrogen have the advantage that they can be recycled, there is no wastewater generation, there is no additional pollution such as acid and dioxin, and there is no ignition source, so it is easy to construct explosion-proof facilities. There is an advantage.

In addition, because the facility configuration is simple and operation is simple, there is an advantage of reducing the number of operating personnel and easy maintenance, and it is possible to reduce operating costs by reusing vaporized nitrogen. It has the advantage of being highly usable because it can be installed and used together.

Although described above with reference to the drawings according to the embodiment of the present disclosure, it is possible for those of ordinary skill in the art to make various applications, modifications and adaptations within the scope of the present invention based on the above contents. will be.

1000: Volatile organic compound recovery system according to an embodiment of the present disclosure
S1000: Volatile organic compound recovery method according to an embodiment of the present disclosure
100: VOC inlet 200: first condensing unit
300: first distribution module 400: second condensing unit
500: second distribution module 600: liquid nitrogen supply unit
700: condensed VOC storage unit 800: nitrogen separation unit
900: VOC exhaust

Claims (9)

a VOC inlet 100 for introducing a process gas containing a volatile organic compound (hereinafter, VOC);
The first condensing unit 200 is connected to the VOC inlet 100 to receive process gas, and cools the process gas to condense the VOC included in the process gas. );
a first distribution module 300 connected to the first condensing unit 200 to separate and discharge VOC and process gas condensed in the first condensing unit 200;
A second condensing unit ( 400);
a second distribution module 500 connected to the second condensing unit 400 to separate and discharge VOC and process gas condensed in the second condensing unit 400;
a liquid nitrogen supply unit 600 connected to the first condensing unit 200 and the second condensing unit 400 and supplying low-temperature liquid nitrogen to the first condensing unit 200;
a condensed VOC storage unit 700 connected to the first distribution module 300 and the second distribution module 500 and receiving and storing the condensed VOC from the distribution modules 300 and 500;
a nitrogen separation unit 800 connected to the second distribution module 500 to receive a process gas, and to separate and discharge nitrogen from the process gas; and
a VOC discharge unit 900 that receives a process gas from which nitrogen is separated from the nitrogen separation unit 800 and determines whether the process gas is discharged; including,
The first condensing unit 200 and the second condensing unit 400 include a gas-liquid separation module, and vaporized nitrogen by heat exchange with the process gas introduced into the condensing units 200 and 400 . separated and supplied to the liquid nitrogen supply unit 600,
The first condensing unit 200 and the second condensing unit 400 are provided with at least one refrigerant transfer pipe through which cryogenic liquid nitrogen is moved therein, and the process gas introduced into the condensing units 200 and 400 . (Process Gas) is indirectly cooled by cryogenic liquid nitrogen moving the refrigerant transfer pipe, characterized in that the VOC contained in the process gas (Process Gas) is condensed,
The first condensing unit 200, the second condensing unit 400, and the liquid nitrogen supply unit 600 are connected to each other so that the low-temperature liquid nitrogen supplied from the liquid nitrogen supply unit 600 is converted into the first condensing unit ( 200) and the second condensing unit 400 and the liquid nitrogen supply unit 600, characterized in that it circulates,
The first distribution module 300 is connected to the condensed VOC storage unit 700 by a condensing line, and is connected to the second condensing unit 400 by a non-condensing line, and is condensed in the first condensing unit 200 . VOC is moved along the condensing line by the first distribution module 300 and stored in the condensed VOC storage unit 700, and the process gas including uncondensed VOC is stored in the first distribution module ( It is moved along the non-condensed line by 300) and is cooled again in the second condensing unit 400,
The second distribution module 500 is connected to the condensed VOC storage unit 700 and a condensing line, and is connected to the nitrogen separating unit 800 and a non-condensed line through a non-condensed line, and the VOC condensed in the second condensing unit 400 . is moved along the condensing line by the second distribution module 500 and stored in the condensed VOC storage unit 700 , and the process gas including uncondensed VOC is stored in the second distribution module 500 . ), characterized in that it is moved to the nitrogen separation unit 800 along the non-condensing line,
The liquid nitrogen supply unit 600 includes a separate cooling and storage system, so that the nitrogen vaporized in the first condensing unit 200 and the second condensing unit 400 and the nitrogen separated in the nitrogen separating unit 800 are separated. is supplied to liquefy gaseous nitrogen and supplied to the first condensing unit 200,
The condensed VOC storage unit 700 includes a separate cooling module to prevent the condensed VOC from being vaporized again, and the cooling module is configured in the first condensing unit 200 and the second condensing unit 400 . It is characterized in that the condensed VOC storage unit 700 is cooled using vaporized nitrogen,
The nitrogen separation unit 800 is characterized in that it includes any one of a PSA (Pressure Swing Absorption) method or a Membrane method,
The VOC discharge unit 900 includes a concentration detection module for detecting the VOC concentration of the provided process gas, and when the sensed VOC concentration value is less than or equal to a preset concentration value, the process gas It is discharged to the atmosphere, and when the detected VOC concentration value exceeds a preset concentration value, the process gas is moved back to the VOC inlet 100 ,
The VOC discharge unit 900 further includes a noise removal unit for increasing precision by removing the noise of the concentration sensing module, and the noise removal unit samples data containing noise at predetermined time intervals, and the sampled data In comparison with the data sampled immediately before, if the difference between the values is within a predetermined range, the data sampled later is adopted, and if the difference between the values is out of the predetermined range, the data sampled immediately before A volatile organic compound recovery system configured to take data.
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