KR101831681B1 - Volatile organic compound removal system and method using the same - Google Patents

Abstract

Disclosed is a volatile organic compound removal system for removing volatile organic compounds by allowing a volatile organic compound (VOCs) gas generated in a coating process to be burned. The present invention provides a system for removing volatile organic compounds (VOCs), comprising: a processing unit for causing a volatile organic compound to be adsorbed and desorbed from an exhaust gas containing volatile organic compounds (VOCs); A reaction unit for causing the volatile organic compounds desorbed in the processing unit to be burned and removed by the high temperature of the plasma; And nitrogen oxide (NO) contained in the produced nitrogen oxide is oxidized to nitrogen dioxide (NO2) when the volatile organic compound is combusted in the reaction unit to generate nitrogen oxide (NOx), wherein the nitrogen oxide And a scrubber unit for reducing the nitrogen dioxide to nitrogen (N2) and exhausting the nitrogen-containing exhaust gas to the outside. As a result, the VOCs generated in the drawing process and various coating processes are concentrated and adsorbed, and the concentrated and adsorbed VOCs are desorbed at a high concentration and the VOCs desorbed at a high concentration are burned, NOx) is oxidized and reduced, the removal efficiency of VOCs can be improved.

Description

[0001] The present invention relates to a volatile organic compound removal system and a volatile organic compound removal method using the same,

The present invention relates to a volatile organic compound removal system and a method for removing volatile organic compounds using the same, and more particularly, to a volatile organic compound removal system for removing volatile organic compounds (VOCs) from a painting process and various coating processes, The present invention relates to a volatile organic compound removal system for removing a compound and a method for removing a volatile organic compound using the same.

Volatile organic compounds (VOCs) are generated in sewage treatment plants, incinerators, food waste disposal facilities, refuse disposal sites, refineries, chemical plants, manure and animal wastewater treatment plants.

VOCs not only cause discomfort by stimulating human nervous system by odor, but they are harmful to human body, and there are many problems from decrease of concentration to decrease of efficiency or increase of safety accidents. It is also the main reason.

In addition, VOCs are classified as chemical substances that are harmful to humans and the environment in many aspects, such as carcinogenic potential, tropospheric ozone formation, photochemical smog formation and explosion.

According to the data of the Ministry of Environment, 43% of the anthropogenic occurrences are related to the painting process and about 13% of the VOCs are related to the printing.

VOCs related to coating process VOCs generated during coating process for architectural, automobile and electronic products are emitted in such a large amount that about 10% to 20% of anthropogenic VOCs are emitted. However, Since VOCs are generated in the form of fugitive emissions, it is not easy to establish appropriate countermeasures against VOCs.

On the other hand, research and development of various treatment methods for eliminating VOCs have been carried out. Among them, a technology for treating odor and harmful gas (including VOCs) using microwave has been developed by researchers in USA and Japan, (Plasma) has been used to treat not only odor and harmful gas contained in the gas but also heavy metal components.

However, the technology for treating odor and harmful gas (including VOCs) using microwave is still in the research stage, and the commercialization stage is not reached through the demonstration.

In addition, plasma technology has problems such as excessive power consumption at the stage of technology development, necessity of large-scale device development, and economical efficiency with other technologies.

Accordingly, it is necessary to develop a device capable of efficiently removing VOCs generated in a coating process while solving the problems of plasma technology.

Korean Patent Publication No. 10-1574675: VOCs treatment device using low-temperature catalyst

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for burning VOCs generated in a coating process and various coating processes by a high temperature of plasma, (NOx) contained in the volatile organic compound is oxidized and reduced.

It is another object of the present invention to provide a volatile organic compound removal system that allows VOCs to be concentratedly adsorbed before the exhaust gas containing VOCs is burned and the concentrated and adsorbed VOCs to be desorbed at a high concentration.

It is a further object of the present invention to provide a VOC-type exhaust gas purifying apparatus which allows VOCs separated by flow in a heat exchange unit to preheat and purify and cool the exhaust gas to a predetermined temperature, And the exhaust gas adsorbed by the VOCs is injected toward the filter.

According to an aspect of the present invention, there is provided a system for removing volatile organic compounds (VOCs), comprising: a processor for adsorbing and desorbing volatile organic compounds from exhaust gas containing volatile organic compounds (VOCs); A reaction unit for causing the volatile organic compounds desorbed in the processing unit to be burned and removed by the high temperature of the plasma; And nitrogen oxide (NO) contained in the produced nitrogen oxide is oxidized to nitrogen dioxide (NO2) when the volatile organic compound is combusted in the reaction unit to generate nitrogen oxide (NOx), wherein the nitrogen oxide And a scrubber unit for reducing the nitrogen dioxide to nitrogen (N2) and exhausting the nitrogen-containing exhaust gas to the outside.

The scrubber unit may further include an oxidation unit for oxidizing the nitrogen monoxide contained in the nitrogen oxide produced by burning the volatile organic compound in the reaction unit to the nitrogen dioxide; And a reducing unit for reducing the nitrogen dioxide oxidized in the oxidizing unit to nitrogen.

The oxidizing unit may be configured to supply a first cleaning liquid having a predetermined pH to the nitrogen oxide so that the nitrogen monoxide contained in the nitrogen oxide is oxidized to the nitrogen dioxide and the first cleaning liquid is included in the nitrogen oxide (2NaCIO2) or sulfuric acid (H2SO4) at the predetermined pH so that the oxidizing nitrogen monoxide is oxidized to the nitrogen dioxide.

And the reducing unit is configured to cause the second cleaning liquid to be supplied to the oxidized nitrogen dioxide so that the oxidized nitrogen dioxide in the oxidizing unit is reduced to the nitrogen and the second cleaning liquid is reduced by the nitrogen (NaOH). ≪ / RTI >

The oxidizing nitrogen dioxide may be supplied together with the second cleaning liquid when the oxidized nitrogen dioxide is supplied from the oxidizing unit at a predetermined amount or more, (2Na < 2 > S < 2 > O < 3 >) which causes the reduced nitrogen dioxide to be reduced to nitrogen.

The processing unit may include a suction unit including a filter into which activated carbon is drawn so that the volatile organic compound is adsorbed from the exhaust gas containing the introduced volatile organic compound when the exhaust gas containing the volatile organic compound is introduced. A heat exchange unit for preheating the adsorption unit to a predetermined temperature so that the volatile organic compound adsorbed on the adsorption unit is desorbed; And a first injecting unit for injecting high-temperature outside air toward the adsorption unit when the adsorption unit is preheated to a predetermined temperature.

Also, the adsorption unit may be configured to close the path through which the volatile organic compound is introduced during the preheating to the predetermined temperature from the heat exchange unit to stop the inflow of the exhaust gas containing the volatile organic compound, It is possible to prevent the exhaust gas containing the VOCs before being preheated to the predetermined temperature from flowing to the reaction part.

The processing unit may include a suction unit including a filter into which activated carbon is drawn so that the volatile organic compound is adsorbed from the exhaust gas containing the introduced volatile organic compound when the exhaust gas containing the volatile organic compound is introduced. A heat exchange unit for preheating the temperature of the exhaust gas adsorbed by the volatile organic compound passing through the adsorption unit to a predetermined temperature; The exhaust gas adsorbed by the volatile organic compound preheated at the preset temperature is injected toward the adsorbing portion so that the volatile organic compound adsorbed on the adsorbing portion is desorbed and the exhaust gas containing the desorbed volatile organic compound A second jetting part for allowing the reaction part to flow; And a cooling unit for injecting cooling gas to the adsorption unit to cool the adsorption unit.

When the exhaust gas to which the volatile organic compound is adsorbed is introduced into the internal space, the heat exchanger may be formed to extend in a direction perpendicular to the direction in which the exhaust gas to which the volatile organic compound is adsorbed, A first spiral wing rotated so that the exhaust gas adsorbed by the organic compound is swirled toward one side; Wherein the volatile organic compound is provided so as to extend in a direction perpendicular to an inflow direction of the adsorbed exhaust gas and to be introduced into the first vane, wherein the exhaust gas adsorbed by the volatile organic compound introduced into the internal space flows toward the other side A second wing in a spiral shape rotated to pivot; A first outlet provided at the one side for allowing exhaust gas adsorbed by the volatile organic compound pivoted to one side through the first vane to flow to the second spray portion along a first path; And a second exhaust port provided on the other side of the exhaust port and adapted to allow the exhaust gas adsorbed by the volatile organic compound pivoted to the other side through the second vane to flow into the second path.

The heat exchanger may be configured to separate the flow of the exhaust gas through which the introduced volatile organic compound is adsorbed through the first vane and the second vane, and the first vane is configured to separate the volatile organic compound The gas may be pivoted around the flow, and the second vane may cause the exhaust gas to which the introduced volatile organic compound adsorbed to be pivoted at the center of the flow.

Also, the heat exchanger may be configured to allow the exhaust gas, which is circulated along the first vane and flows along the first path, to be adsorbed by the volatile organic compound to be preheated to a predetermined temperature, and the preheated volatile organic compound And the exhaust gas adsorbed by the volatile organic compound flowing along the second path is purged and cooled to flow to the cooling unit so that the adsorbed exhaust gas flows to the second spray unit, have.

The diameter of the first wing may increase toward one side such that the exhaust gas to which the volatile organic compound is adsorbed is turned toward the periphery of the flow.

The heat exchange unit may further include a storage unit connected to the second outlet through the second path and storing the exhaust gas adsorbed by the volatile organic compound flowing along the second path.

The heat exchanger may be configured to store the exhaust gas adsorbed by the volatile organic compound flowing in the other direction through the second vane in the storage unit for a predetermined period of time, A third path connected to a part of a path through which the exhaust gas adsorbed by the volatile organic compound flows from the adsorption unit is opened so that the volatile organic compound stored in the storage unit is adsorbed And a valve portion for allowing the exhaust gas to flow into the internal space again along the third path for heat exchange.

According to another aspect of the present invention, there is provided a method for removing volatile organic compounds (VOCs) from an exhaust gas containing volatile organic compounds (VOCs) by adsorbing and desorbing the volatile organic compounds step; Causing the reaction part to burn out the volatile organic compound desorbed in the processing part by the high temperature of the plasma; (NO) contained in the generated nitrogen oxide is oxidized to nitrogen dioxide (NO2) when the volatile organic compound is burned in the reaction part and the scrubber part is combusted to generate nitrogen oxide (NOx), and the nitrogen monoxide And allowing the nitrogen dioxide to be reduced to nitrogen (N 2) when oxidized by the nitrogen dioxide, so that the exhaust gas containing the nitrogen is discharged to the outside.

As a result, the VOCs generated in the drawing process and various coating processes are concentrated and adsorbed, the concentrated and adsorbed VOCs are desorbed at a high concentration, the VOCs desorbed at high concentration are subjected to the combustion treatment, (NOx) is oxidized and reduced, the removal efficiency of VOCs can be improved.

The VOCs separating the flow from the heat exchanger may be injected into the filter after the adsorbed exhaust gas is preheated to a predetermined temperature, thereby improving the desorption efficiency of the VOCs.

Further, the VOCs from which the flow is separated from the heat exchanging portion are injected into the filter after the adsorbed exhaust gas is purified and cooled, thereby replacing the cooling gas supplied from the outside, thereby saving the cooling gas.

1 is a block diagram of a system for removing volatile organic compounds according to an embodiment of the present invention;
2 is a flow chart of a method for removing volatile organic compounds according to an embodiment of the present invention,
FIG. 3 is a flowchart illustrating a process sequence of a volatile organic compound removal system according to an embodiment of the present invention;
4 is a block diagram illustrating components of a volatile organic compound removal system according to an embodiment of the present invention.
5 is a cross-sectional view of a system for removing volatile organic compounds according to an embodiment of the present invention,
FIG. 6 is a flow chart for explaining a process sequence of a volatile organic compound removal system according to another embodiment of the present invention;
7 is a block diagram illustrating components of a volatile organic compound removal system according to another embodiment of the present invention.
8 is a cross-sectional view of a system for removing volatile organic compounds according to another embodiment of the present invention,
FIG. 9 is a cross-sectional view of an adsorption unit for adsorbing VOCs from an exhaust gas containing VOCs according to another embodiment of the present invention;
FIG. 10 is a cross-sectional view of a heat exchanging unit in which VOCs according to another embodiment of the present invention are separated from a flow of desorbed exhaust gas,
11 is a flowchart for explaining a process sequence of a volatile organic compound removal system according to another embodiment of the present invention,
12 is a cross-sectional view of a system for removing volatile organic compounds according to another embodiment of the present invention and Fig.
13 is a cross-sectional view of a heat exchanging unit in which VOCs according to another embodiment of the present invention are separated from a flow of desorbed exhaust gas.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided as examples for allowing a person skilled in the art to sufficiently convey the ideas of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms.

FIG. 1 is a block diagram of a system for removing volatile organic compounds according to an embodiment of the present invention, and FIG. 2 is a flowchart illustrating a method for removing volatile organic compounds according to an embodiment of the present invention.

1 and 2, the system for removing volatile organic compounds according to an embodiment of the present invention allows the VOCs generated in the coating process and various coating processes to be burned by the high temperature of the plasma, (NOx) produced and treated is oxidized and reduced.

The system for removing volatile organic compounds according to the present embodiment is a system that allows VOCs to be concentrated and adsorbed before the exhaust gas containing VOCs is burned, and the concentrated and adsorbed VOCs to be desorbed at a high concentration.

1 and 2, the system for removing volatile organic compounds according to the present embodiment includes a processing unit 100, a reaction unit 200, and a scrubber unit 300.

The processing unit 100 allows the VOCs to be adsorbed and desorbed from the exhaust gas containing the VOCs introduced in the coating process and various coating processes (S210).

Here, exhaust gas containing VOCs desorbed from the treatment section 100 may flow to the reaction section 200.

A detailed description of the structure of the processing unit 100 for allowing the VOCs to be adsorbed and desorbed will be described later.

The reaction unit 200 allows the VOCs to be removed from the exhaust gas containing VOCs desorbed in the treatment unit 100 through the high temperature of the plasma (S220).

When the VOCs are burned and removed, the reaction unit 200 can generate nitrogen oxides by the chemical reaction.

In addition, the exhaust gas in which the VOCs are burned and removed in the reaction part 200 can be discharged to the outside.

A detailed description of the configuration of the reaction unit 200 for allowing the VOCs to be burned and removed through the high temperature of the plasma will be described later.

The scrubber unit 300 causes the nitrogen oxide produced in the reaction unit 200 to be oxidized or reduced (S230).

Here, the scrubber unit 300 is configured to cause the nitrogen monoxide NO contained in the nitrogen oxide to be oxidized to nitrogen dioxide (NO2), and the oxidized nitrogen dioxide can be absorbed and removed.

At this time, oxidized nitrogen dioxide can be reduced to nitrogen (N2) by being absorbed and removed.

A detailed description of the configuration of the scrubber unit 300 that causes the nitrogen oxide to be oxidized and reduced will be described later.

FIG. 3 is a flowchart illustrating a process sequence of a volatile organic compound removal system according to an embodiment of the present invention. FIG. 4 is a block diagram illustrating components of a volatile organic compound removal system according to an embodiment of the present invention. And FIG. 5 is a cross-sectional view of a system for removing volatile organic compounds according to an embodiment of the present invention.

3 to 5, the processing unit 100 includes a suction unit 110, a heat exchanging unit 120, and a first jetting unit 130.

When the exhaust gas containing VOCs is introduced in the coating process and various coating processes (S310), the adsorption unit 110 may adsorb VOCs from the exhaust gas containing VOCs (S320).

Here, the adsorption unit 110 may be provided with a filter 111 having activated carbon for adsorbing VOCs.

The heat exchange unit 120 may preheat the adsorbed portion 110 to preheat the exhaust gas to which the VOCs have been adsorbed (S330).

Specifically, the heat exchanging unit 120 is configured such that the exhaust gas containing VOCs is introduced into the adsorption unit 110, the VOCs of the exhaust gas containing the VOCs are adsorbed, and the exhaust gas containing the VOCs desorbed from the adsorption unit 110 The adsorption unit 110 can be preheated to a predetermined temperature when the path for allowing gas to flow to the reaction unit 200 is closed.

The reason why the exhaust gas containing VOCs desorbed by the adsorption unit 110 is allowed to flow to the reaction unit 200 is to be closed before the exhaust gas containing the VOCs is preheated to the predetermined temperature, In order to prevent it from flowing.

To this end, a first exhaust fan 112 may be provided in the adsorption unit 110 to open or close a path for flowing into the reaction unit 200.

The preset temperature of the heat exchanging unit 120 is a temperature for allowing the VOCs to be desorbed from the adsorption unit 110 and may be 100 ° C to 200 ° C and may be 120 ° C in the present embodiment.

When the adsorption unit 110 is preheated to a predetermined temperature, a path for allowing the exhaust gas containing VOCs desorbed from the adsorption unit 110 to flow to the reaction unit 200 is opened, So that the exhaust gas containing the VOCs desorbed can flow to the reaction part 200.

At this time, the adsorption unit 110 may close the path through which exhaust gas containing VOCs is introduced.

This is to prevent exhaust gas containing VOCs desorbed from the adsorption unit 110 from being discharged to the outside.

To this end, a second exhaust fan 113 may be provided to open or close the path through which the exhaust gas containing VOCs is introduced into the adsorption unit 110.

When the exhaust gas containing VOCs desorbed from the adsorption unit 110 flows into the reaction unit 200 after the adsorption unit 110 is preheated to a predetermined temperature, And may be sprayed onto the adsorption unit 110 (S340).

Accordingly, the VOCs adsorbed to the adsorption unit 110 can be removed from the adsorption unit 110 (S350).

The reaction unit 200 includes a plasma generation unit 210 and a combustion unit 220.

The plasma generating part 210 may be provided in a plasma torch type to generate plasma and transmit the generated plasma to the burning part 220.

Meanwhile, the plasma generated by the plasma generating part 210 may be an arc plasma for smooth removal of VOCs.

When the exhaust gas containing VOCs desorbed from the adsorption unit 110 flows into the combustion unit 220, the exhaust gas containing VOCs desorbed from the adsorption unit 110 passes through the plasma generated from the plasma generation unit 210 And may be burned at a high temperature (S360).

Here, the temperature of the plasma for burning the exhaust gas containing desorbed VOCs may be 3,000 DEG C or higher.

At this time, if the exhaust gas containing the desorbed VOCs is burned by the high temperature of the plasma, nitrogen oxides may be generated in the combustion unit 220 (S370).

Meanwhile, the nitrogen oxides generated from the combustion unit 220 may flow into the scrubber unit 300.

The nitrogen oxide produced in the combustion unit 220 may contain nitrogen monoxide of 90% or more.

The scrubber unit 300 is provided with an oxidizing unit 310 and a reducing unit 320.

The oxidation unit 310 may cause the nitrogen monoxide contained in the nitrogen oxide flowing from the combustion unit 220 to be oxidized to nitrogen dioxide (S380).

On the other hand, the oxidizing unit 310 can supply the nitrogen oxide to the first cleaning liquid at a preset pH so that nitrogen monoxide included in the nitrogen oxide is oxidized to nitrogen dioxide.

Here, the first cleaning liquid may be sodium chlorite (2NaCIO 2) or sulfuric acid (H 2 SO 4) to oxidize nitrogen monoxide to nitrogen dioxide through an oxidation reaction.

Also, the predetermined pH may be from pH 3 to pH 5 in order to maximize the oxidation reaction.

In addition, the oxidizing unit 310 may supply the first cleaning liquid having a preset temperature.

Here, the preset temperature of the oxidizing unit 310 may be a temperature of 200 ° C or more to maximize the oxidation reaction of the nitrogen monoxide.

The reducing unit 320 may absorb nitrogen dioxide oxidized by the oxidizing unit 310 and may reduce nitrogen from the oxidized nitrogen oxide (S390).

Also, the reducing unit 320 can absorb and remove oxidized nitrogen dioxide through a wet cleaning method.

For this, the reducing unit 320 may supply the second cleaning liquid to the oxidized nitrogen dioxide.

Here, the second rinsing liquid may be sodium hydroxide (NaOH) to cause the oxidized nitrogen dioxide to be absorbed and removed and reduced to nitrogen.

The reducing unit 320 prevents the efficiency of absorption and removal from being reduced when a predetermined amount of oxidized nitrogen dioxide is supplied from the oxidizing unit 310 and reduces the maximum amount of nitrogen from the oxidized nitrogen dioxide, It is possible to further add additives.

Here, the additive may be sodium thiosulfate (2Na2S₂O₃) for allowing a predetermined amount of oxidized nitrogen dioxide to be absorbed and removed.

The scrubber unit 300 is not shown in the figure but a heat exchanger (not shown) is installed in order to lower the temperature of the exhaust gas containing the burned VOCs passing through the combustion unit 220 to room temperature .

Thus, the heat exchanger (not shown) is provided to allow carbon dioxide oxidized at room temperature to be absorbed and removed through the reducing unit 320, and then discharged to the outside.

In addition, the heat exchanger (not shown) is not provided separately and is provided in the scrubber unit 300 so as to minimize the installation space of the VOCs removal system.

Meanwhile, the temperature of the exhaust gas containing VOCs burned through the combustion unit 220 may be 200 ° C to 400 ° C.

FIG. 6 is a flow chart for explaining a process sequence of a volatile organic compound removal system according to another embodiment of the present invention, and FIG. 7 is a block diagram illustrating components of a volatile organic compound removal system according to another embodiment of the present invention 8 is a cross-sectional view of a system for removing volatile organic compounds according to another embodiment of the present invention.

6 to 8, the processing unit 100 of another embodiment includes a suction unit 110, a heat exchange unit 120, a second spray unit 140, and a cooling unit 150.

When the exhaust gas containing VOCs is introduced in the coating process and various coating processes (S610), the adsorption unit 110 can adsorb VOCs from the exhaust gas containing the VOCs (S620).

Here, the adsorption unit 110 may be provided with a filter 111 to be described later in which activated carbon is adsorbed to adsorb VOCs.

The heat exchanger 120 may preheat the exhaust gas to which the VOCs passing through the adsorption unit 110 are adsorbed to a predetermined temperature (S630).

A detailed description of the configuration of the heat exchanging unit 120 for preheating the exhaust gas adsorbed by the VOCs to a predetermined temperature will be described later.

The second injector 140 may inject the exhaust gas to which the VOCs preheated to a preset temperature have been adsorbed to the adsorption unit 110 (S640).

Accordingly, the exhaust gas adsorbed by the VOCs preheated to a predetermined temperature is injected to the adsorption unit 110, so that the VOCs adsorbed to the adsorption unit 110 can be desorbed (S650).

8, the second jetting unit 140 may be preheated to a predetermined temperature in a state of being as close as possible to the adsorption unit 110 so that the desorption efficiency of the VOCs adsorbed on the adsorption unit 110 is increased, So that the exhaust gas adsorbed by the VOCs can be injected.

The cooling unit 150 may inject the cooling gas toward the adsorption unit 110 in order to increase the adsorption efficiency of the adsorption unit 110.

Here, the cooling unit 150 may supply a cooling gas to the adsorption unit 110 when the inflow of the exhaust gas containing VOCs is stopped in the coating process and various coating processes, or when a control signal is received from the control unit (not shown) It can be sprayed.

Although not shown in the drawing, the treatment section 100 may further include an exhaust section (not shown) for exhausting the exhaust gas to which the VOCs having passed through the adsorption section are adsorbed.

In addition, the exhaust part (not shown) can also cause the cooling gas injected from the cooling part 150 to be discharged to the outside.

In the process (S660) in which the exhaust gas containing the VOCs that the combustion unit 220 desorbs from the adsorption unit 110 through the high temperature of the plasma is combusted, the reducing unit 320 oxidizes the nitrogen dioxide The processes up to the step of absorbing and removing (S690) are the same as the processes of the volatile organic compound system of one embodiment, and thus a detailed description thereof will be omitted.

FIG. 9 is a cross-sectional view of an adsorption unit for adsorbing VOCs from an exhaust gas containing VOCs according to another embodiment of the present invention. FIG.

Referring to FIG. 9, the adsorption unit 110 is provided with a filter 111, a first exhaust fan 112, and a second exhaust fan 113.

The filter 111 can attract activated carbon so that VOCs can be adsorbed from the exhaust gas containing VOCs.

Accordingly, the exhaust gas to which the VOCs are adsorbed can flow into the heat exchanging part 120. [

The first exhaust fan 112 is heat-exchanged from the heat exchanging part 120. When the VOCs adsorbed by the VOCs flowing through the second jetting part 140 are desorbed by the filter 111, The exhaust gas containing the VOCs may be opened or closed so as to flow to the combustion section 220.

At this time, the first exhaust fan 112 is not always open and can be opened when the second exhaust fan 113 is closed.

Conversely, the first exhaust fan 112 may be closed when the second exhaust fan 113 is opened.

This makes it possible to prevent the inflow of exhaust gas containing VOCs or desorbed VOCs not preheated to a predetermined temperature.

The second exhaust fan 113 may be opened or closed to allow exhaust gas containing VOCs to be introduced into the adsorption unit 110. [

At this time, the second exhaust fan 113 is not always open, and the first exhaust fan 112 is closed, but can be opened when the exhaust gas containing VOCs is introduced.

Conversely, the second exhaust fan 113 can be closed when the first exhaust fan 112 is opened.

As a result, the exhaust gas containing the desorbed VOCs can be prevented from being discharged to the outside.

10 is a cross-sectional view of a heat exchanger in which VOCs according to another embodiment of the present invention allow the flow of desorbed exhaust gas to be separated.

Referring to FIG. 10, the heat exchanging unit 120 includes a first wing 121, a second wing 122, a first valve unit 123, and a second valve unit 124.

The first wing 121 is provided in the inner space and can be rotated so that the exhaust gas containing the VOCs passing through the filter 111 is turned toward one side.

At this time, the first wing 121 is formed in a spiral shape, so that the exhaust gas to which the VOCs are adsorbed can be turned when rotated.

Specifically, the first wing 121 is formed in a spiral shape so that the exhaust gas to which the VOCs are adsorbed can be turned in one direction.

Also, the first wing 121 is formed in a spiral shape opposite to the spiral shape of the second wing 122, so that the flow of the exhaust gas adsorbed by the VOCs can be separated.

In addition, the diameter of the first wing 121 may be increased toward one side so that the exhaust gas to which the VOCs are adsorbed is pivoted around the flow.

The second wing 122 is drawn into the first wing 121 and can be made to swivel the exhaust gas to which the VOCs are adsorbed when it is rotated.

Specifically, the second vane 122 is formed in a spiral shape so that the exhaust gas to which the VOCs are adsorbed can be turned in the other direction.

As described above, the second vanes 122 are formed in a spiral shape opposite to the first vanes 121, so that the flow of the exhaust gas to which the VOCs are adsorbed can be separated.

On the other hand, the second vanes 121 are drawn into the first vanes 122, and are formed to have the same diameter, so that the exhaust gas to which the VOCs are adsorbed can be turned at the center of the flow.

The reason why the first wing 121 and the second vane 122 are provided is that the flow is separated according to the difference in the atmospheric pressure of the exhaust gas to which the VOCs are adsorbed.

For example, when the exhaust gas to which the VOCs having passed through the filter 111 is introduced into the internal space of the heat exchanging unit 120, the exhaust gas to which the VOCs are adsorbed is directed in one direction through the first vane 121 The flow can be separated into the first exhaust gas (A) pivoted and the second exhaust gas (B) turned in the other direction through the second vane (122).

Here, the first exhaust gas A is pivoted along the first wing 121 in the periphery of a flow having a relatively high air pressure as compared with the second exhaust gas B, and the temperature is lower than that of the second exhaust gas B High VOCs can be the adsorbed exhaust gas.

On the other hand, the second exhaust gas B is pivoted along the second vane 122 at the center of the flow having a relatively low air pressure relative to the first exhaust gas A, and the temperature is lower than the first exhaust gas A Low VOCs may be the adsorbed exhaust gas.

The first valve unit 123 may be opened to allow the first exhaust gas A, which is turned in one direction along the first vane 121, to flow into the first outlet 125.

The first exhaust gas A having passed through the first valve portion 123 is not shown in the drawing, but may be preheated to a predetermined temperature in the first path through a heater (not shown).

On the other hand, the first valve unit 123 is operated when a heater (not shown) is operated. Can be closed for preheating the first exhaust gas (A).

The first exhaust gas, which has been preheated to a predetermined temperature, may flow to the second injection part 140 along the first path.

The second valve portion 124 may be opened to allow the second exhaust gas B, which is pivoted to the other side along the second vane 122, to flow into the second outlet 126.

The second exhaust gas B having passed through the second valve portion 124 is not shown in the drawing, but can be purified through a purifier (not shown).

The second exhaust gas purified through the purifier (not shown) is not shown in the drawing, but can be cooled through a cooling device (not shown).

Meanwhile, the cooled second exhaust gas may flow to the cooling unit 150 along the second path.

In this way, the cooling unit 150 not only supplies the cooling gas supplied from the outside. The filter 111 can be cooled through the second exhaust gas cooled through the cooling device (not shown).

FIG. 11 is a flowchart for explaining a process sequence of a volatile organic compound removal system according to another embodiment of the present invention, FIG. 12 is a sectional view of a volatile organic compound removal system according to another embodiment of the present invention, Is a cross-sectional view of a heat exchange unit in which VOCs according to another embodiment of the present invention allow the flow of desorbed exhaust gas to be separated.

11 to 13, the volatile organic compound removal system of another embodiment differs from the volatile organic compound removal system of the other embodiments in that the exhaust gas adsorbed by VOCs is re-introduced into the heat exchange unit 120 for heat exchange .

When the exhaust gas containing VOCs is introduced in the coating process and various coating processes (S1110), the adsorption unit 110 can adsorb VOCs from the exhaust gas containing the VOCs (S1115).

Here, the adsorption unit 110 may be provided with a filter 111 having activated carbon for adsorbing VOCs.

The heat exchanging unit 120 may preheat the exhaust gas to which the VOCs passing through the adsorption unit 110 are adsorbed to a predetermined temperature (S1120).

Hereinafter, it is assumed that the reducing unit 320 oxidizes the oxidizing unit 310 from the process (S1125) of causing the heat exchanging unit 120 to inject the exhaust gas adsorbed by the VOCs preheated to a predetermined temperature onto the adsorbing unit 110, The process of absorbing / removing nitrogen dioxide and reducing it to nitrogen (S1150) is the same as that described in the other embodiments, and thus a detailed description thereof will be omitted.

On the other hand, the exhaust gas to which the VOCs not preheated to a predetermined temperature has been adsorbed from the heat exchange unit 120 can be stored (S1155).

To this end, the heat exchanging unit 120 of another embodiment may further include a storage unit 127. [

The storage part 127 may be provided in the second path and may store the second exhaust gas B1 which is turned in the other direction along the second vane 122 and flows along the second path.

That is, the exhaust gas to which the VOCs not preheated to a pre-set temperature has been adsorbed may be referred to as a second exhaust gas B1 which is turned toward the other side along the second vane 122.

If the exhaust gas containing VOCs that have not been pre-heated to a predetermined temperature is stored in the storage unit 127 and the inflow of exhaust gas containing VOCs is stopped toward the adsorption unit 110 (YES in S1160) May be opened (S1165).

Here, the separate route induces the exhaust gas B2, which has not been preheated to a predetermined temperature stored in the storage unit 127, to be re-introduced into the internal space of the heat exchange unit 120 from the storage unit 127 May be a third path.

Accordingly, the exhaust gas to which the VOCs not preheated to a predetermined temperature has been adsorbed can be heat-exchanged again in the heat exchange unit 120.

Meanwhile, the heat exchanging unit 120 may be configured such that, during the flow of the exhaust gas B2 adsorbed by the VOCs that have not been preheated to a predetermined temperature through the third path, the VOCs, which have not been preheated to a predetermined temperature, The inlet can be closed through the valve to prevent it from flowing toward the adsorption unit 110. [

Further, although not shown in the drawing, a valve unit (not shown) for opening or closing the third path is further provided, so that the exhaust gas to which the VOCs in a state in which the flow is not separated is sucked into the heat exchanging unit 120 It is possible to prevent the exhaust gas from being adsorbed by the VOCs in a state in which the flow is not separated from flowing into the third path.

Alternatively, if the exhaust gas B1 to which the VOCs not preheated to a predetermined temperature has been adsorbed is stored in the storage unit 127 and the inflow of the exhaust gas containing VOCs is not stopped toward the adsorption unit 110 S1160-NO), the exhaust gas B1 to which the VOCs not preheated to a predetermined temperature has been adsorbed can be continuously stored in the storage unit 127. [

According to the detailed description of the present invention, the volatile organic compound removal system enables the VOCs generated in the drawing process and various coating processes to be concentratedly adsorbed, the concentrated and adsorbed VOCs to be desorbed at a high concentration, and the VOCs desorbed at a high concentration The NOx removal efficiency of the VOCs can be improved by oxidizing and reducing the nitrogen oxides (NOx) produced by burning the VOCs after being treated.

The VOCs separating the flow from the heat exchanger may be injected into the filter after the adsorbed exhaust gas is preheated to a predetermined temperature, thereby improving the desorption efficiency of the VOCs.

Further, the VOCs from which the flow is separated from the heat exchanging portion are injected into the filter after the adsorbed exhaust gas is purified and cooled, thereby replacing the cooling gas supplied from the outside, thereby saving the cooling gas.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

100: Processor 110:
111: filter 112: first exhaust fan
113: second exhaust fan 120: heat exchanger
121: first wing 122: second wing
123: first valve portion 124: second valve portion
125: first outlet 126: second outlet
127: storage part 130: first ejection part
140: second sprayer part 150: cooling part
200: Reactor 210: Plasma generator
220: Combustion part 300: Scrubber part
310: oxidizing part 320: reducing part
A: first exhaust gas B: second exhaust gas

Claims (15)

A processing unit for causing the volatile organic compound to be adsorbed and desorbed from an exhaust gas containing volatile organic compounds (VOCs);
A reaction unit for causing the volatile organic compounds desorbed in the processing unit to be burned and removed by the high temperature of the plasma; And
(NO) contained in the generated nitrogen oxide is oxidized to nitrogen dioxide (NO2) when the volatile organic compound is burned in the reaction unit to generate nitrogen oxide (NOx), and the nitrogen monoxide is oxidized with the nitrogen dioxide And a scrubber unit configured to reduce the nitrogen dioxide to nitrogen (N2) when the oxidizing gas is oxidized, and to exhaust the exhaust gas containing the nitrogen to the outside. The method according to claim 1,
The scrubber section
An oxidizing unit for oxidizing the nitrogen monoxide contained in the nitrogen oxide produced by burning the volatile organic compound in the reaction unit to the nitrogen dioxide; And
And a reducing unit for reducing the nitrogen dioxide oxidized in the oxidizing unit to nitrogen. 3. The method of claim 2,
The oxidation unit
The first cleaning liquid having a predetermined pH is supplied to the nitrogen oxide so that the nitrogen monoxide contained in the nitrogen oxide is oxidized to the nitrogen dioxide,
The first cleaning liquid may contain,
Wherein the nitrogen oxide is sodium hypochlorite (2NaCIO2) or sulfuric acid (H2SO4) at the predetermined pH so that the nitrogen monoxide contained in the nitrogen oxide is oxidized to the nitrogen dioxide. 3. The method of claim 2,
The reducing unit includes:
The second cleaning liquid is supplied to the oxidized nitrogen dioxide so that the oxidized nitrogen dioxide in the oxidizing unit is reduced to the nitrogen,
The second cleaning liquid,
Wherein the oxidizing nitrogen dioxide is sodium hydroxide (NaOH) which is reduced to nitrogen. 5. The method of claim 4,
The reducing unit includes:
When the oxidized nitrogen dioxide is supplied from the oxidizing unit over a predetermined amount, the oxidizing nitrogen dioxide is supplied together with the second cleaning liquid,
Preferably,
(2Na < 2 > S < 2 > O &sub3;) for reducing the predetermined amount of oxidized nitrogen dioxide to nitrogen. The method according to claim 1,
Wherein,
A suction unit including a filter into which activated carbon is drawn so that the volatile organic compound is adsorbed from an exhaust gas containing the introduced volatile organic compound when the exhaust gas containing the volatile organic compound is introduced;
A heat exchange unit for preheating the adsorption unit to a predetermined temperature so that the volatile organic compound adsorbed on the adsorption unit is desorbed; And
And a first injecting unit injecting a high-temperature outside air toward the adsorption unit when the adsorption unit is preheated to a predetermined temperature. The method according to claim 6,
The adsorption unit
The flow path of the volatile organic compound during the preheating from the heat exchanging unit to the predetermined temperature is closed so that the inflow of the exhaust gas containing the volatile organic compound is stopped,
The exhaust gas containing VOCs before being preheated to a predetermined temperature is prevented from flowing to the reaction unit when the preheating is completed at the predetermined temperature from the heat exchange unit, Volatile organic compound removal system. The method according to claim 1,
Wherein,
A suction unit including a filter into which activated carbon is drawn so that the volatile organic compound is adsorbed from an exhaust gas containing the introduced volatile organic compound when the exhaust gas containing the volatile organic compound is introduced;
A heat exchange unit for preheating the temperature of the exhaust gas adsorbed by the volatile organic compound passing through the adsorption unit to a predetermined temperature;
The exhaust gas adsorbed by the volatile organic compound preheated at the preset temperature is injected toward the adsorbing portion so that the volatile organic compound adsorbed on the adsorbing portion is desorbed and the exhaust gas containing the desorbed volatile organic compound A second jetting part for allowing the reaction part to flow; And
And a cooling unit for injecting a cooling gas into the adsorption unit to cool the adsorption unit. 9. The method of claim 8,
The heat-
Wherein when the exhaust gas to which the volatile organic compound has been adsorbed is introduced into the internal space, the volatile organic compound is extended in a direction perpendicular to the direction in which the exhaust gas is adsorbed and the volatile organic compound introduced into the internal space is adsorbed A spiral first wing rotated so that gas is swirled toward one side;
Wherein the volatile organic compound is provided so as to extend in a direction perpendicular to an inflow direction of the adsorbed exhaust gas and to be introduced into the first vane, wherein the exhaust gas adsorbed by the volatile organic compound introduced into the internal space flows toward the other side A second wing in a spiral shape rotated to pivot;
A first outlet provided at the one side for allowing exhaust gas adsorbed by the volatile organic compound pivoted to one side through the first vane to flow to the second spray portion along a first path; And
And a second outlet provided on the other side of the first vane and adapted to allow the exhaust gas, to which the volatile organic compound pumped to the other side through the second vane is adsorbed, to flow into the second path. 10. The method of claim 9,
The heat-
The flow of the exhaust gas adsorbed by the introduced volatile organic compound is separated through the first vane and the second vane,
The first wing
So that the exhaust gas to which the introduced volatile organic compound adsorbed is pivoted around the flow,
The second wing
And the exhaust gas adsorbed by the introduced volatile organic compound is pivoted at the center of the flow. 11. The method of claim 10,
The heat-
Wherein the exhaust gas adsorbed by the volatile organic compound, which has been pre-heated to a predetermined temperature, is exhausted from the exhaust gas adsorbed by the volatile organic compound, To flow into the second branch,
And the exhaust gas adsorbed by the volatile organic compound flowing along the second path is purged and cooled to flow to the cooling unit. 11. The method of claim 10,
The first wing
Wherein the diameter increases toward one side so that the exhaust gas to which the volatile organic compound is adsorbed is turned toward the periphery of the flow. 11. The method of claim 10,
The heat-
And a storage unit connected to the second outlet through the second path and storing the exhaust gas adsorbed by the volatile organic compound flowing along the second path, . 14. The method of claim 13,
The heat-
The exhaust gas adsorbed by the volatile organic compound flowing in the other direction through the second vane is stored in the storage unit for a predetermined period of time and the inflow of the exhaust gas containing the volatile organic compound into the internal space of the adsorption unit is stopped A third path connected to a part of a path through which the exhaust gas adsorbed by the volatile organic compound flows is opened from the adsorbing part, so that the exhaust gas adsorbed by the volatile organic compound stored in the storing part Further comprising: a valve unit for re-flowing into the internal space along the third path to heat-exchange the volatile organic compound. Causing the processing unit to adsorb and desorb the volatile organic compound from the exhaust gas containing volatile organic compounds (VOCs);
Causing the reaction part to burn out the volatile organic compound desorbed in the processing part by the high temperature of the plasma; And
Wherein the scrubber unit causes the nitrogen oxide (NO) contained in the generated nitrogen oxide to be oxidized to nitrogen dioxide (NO2) when the volatile organic compound is combusted in the reaction unit to generate nitrogen oxide (NOx) Wherein the nitrogen oxide is reduced to nitrogen (N2) when oxidized by nitrogen dioxide, and the exhaust gas containing nitrogen is discharged to the outside.

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