KR20200026399A - Apparatus and method for removing nitrogen oxide contained in waste gas using an adsorbent - Google Patents

Abstract

An apparatus for removing nitrogen oxides contained in waste gas by using an adsorbent according to the present invention, as an apparatus for removing nitrogen oxides contained in waste gas generated in industrial fields, includes: an apparatus main body in a portion of which a gas inlet and a gas outlet are each correspondingly formed to purify flown-in waste gas and flow out the purified waste gas; a heater unit which is connected to the gas inlet within the apparatus main body to provide a heat source; a catalyst unit which is connected to the heater unit to oxidation-treat the nitrogen oxides by using an oxidation catalyst while receiving the heat source generated in the heater unit; a heat exchange unit which lowers the temperature of the waste gas by lowering a gas discharged from the catalyst unit to a set temperature of an adsorption reaction; an adsorption unit which is connected to the heat exchange unit and adsorbs the nitrogen oxides passing through the heat exchange unit by using the adsorbent; and an insulation unit which is provided in a portion of the apparatus main body to block heat of the apparatus main body from being emitted to outside air, wherein the heater unit and catalyst unit are integrally manufactured to easily perform a heat transfer process. The apparatus according to the present invention may have high adsorption efficiency and an effect of reducing operating costs accordingly by converting the nitrogen oxides into an easily adsorbable material and adsorbing and removing the easily adsorbable material in treatment of the nitrogen oxides flown in a semiconductor process.

Description

Apparatus and method for removing nitrogen oxides contained in waste gas by using adsorbent {APPARATUS AND METHOD FOR REMOVING NITROGEN OXIDE CONTAINED IN WASTE GAS USING AN ADSORBENT}

The present invention relates to an apparatus and a method for reducing nitrogen oxides in waste gas issued in an industrial field, and converts nitrogen monoxide (NO) in nitrogen oxides to nitrogen dioxide (NO 2) using an oxidation catalyst reaction, and the converted nitrogen dioxide is The present invention relates to an apparatus and a method for removing nitrogen oxides contained in waste gas by using an adsorbent.

In general, nitrogen oxide is a term commonly used to refer to a compound consisting of nitrogen and oxygen, such as nitrogen monoxide, nitrogen dioxide, dinitrogen monoxide, dinitrogen trioxide, or mixtures thereof, and is generated in large quantities in various industrial processes. have.

When the nitrogen oxides are discharged to the atmosphere, it causes acid rain, eyes, respiratory diseases, and the like, and is known as a source of fine dust through secondary reactions.

Therefore, various processing technologies such as SCR and SNCR are applied and are operating in industrial processes.

However, technologies such as SCR and SNCR essentially use a reducing agent such as ammonia gas or urea water, and its use is limited due to the danger of a reducing agent fluid in a special industrial product process such as semiconductor or display or solar panel.

In addition, the wet treatment technology needs to solve the problem of secondary accidents caused by waste water leakage, the use of a large amount of water, and the enormous cost of waste water treatment. Therefore, it is necessary to develop a stable adsorption treatment technology for nitrogen oxides. have.

Application of various catalysts and adsorbents such as urea water, SCR catalyst, and nitrogen oxide adsorbent alone has been considered as a method for reducing nitrogen oxides.However, in the case of using urea water, unreacted ammonia treatment technology is additionally required, or nitrogen oxide In the case of using the adsorbent alone, there is a problem in applying the technology, such as the development of a high level of adsorption performance is not required to ensure efficiency and cost.

Republic of Korea Patent No. 10-1863940 (Invention name: Method and apparatus for removing nitrogen oxide from exhaust gas)

Therefore, the present invention has been made in order to solve the above problems, the problem to be solved of the present invention is a heater for heating the inlet, the inlet to which harmful gas containing nitrogen oxide discharged from the industrial process flows in Apparatus and method for removing nitrogen oxides contained in the waste gas by using an adsorbent consisting of a catalytic part for converting nitrogen monoxide to nitrogen dioxide, a heat exchanger part for cooling the gas before the adsorption reaction, and an adsorption part for final adsorption of the cooled gas. To provide.

However, technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly to those skilled in the art from the following description. It can be understood.

The present invention has been created to improve the problems of the prior art as described above, as a device for removing nitrogen oxides from the waste gas generated in the industrial field, the gas inlet and the gas outlet is formed to correspond to each part of the waste gas introduced The apparatus main body to purify and outflow; A heater unit connected to the gas inlet inside the apparatus body to provide a heat source; A catalyst unit connected to the heater unit to oxidize nitrogen oxide using an oxidation catalyst while receiving a heat source generated by the heater unit; A heat exchange unit which lowers the temperature of the waste gas by lowering the gas discharged from the catalyst unit to a temperature set for the adsorption reaction; An adsorption unit connected to the heat exchange unit and adsorbing nitrogen oxide having passed through the heat exchange unit using an adsorbent; And a heat insulation unit provided at a portion of the device body to block heat of the device body from being discharged to the outside air. The heater unit and the catalyst unit may be integrally manufactured to facilitate heat transfer.

In addition, the oxidation catalyst may convert nitrogen monoxide into nitrogen dioxide in nitrogen oxides.

In addition, the adsorption unit is provided with an adsorbent at the rear to perform the adsorption removal role, the inside is configured to be separated in multiple stages and at least one or more porous plates may be partitioned by zone corresponding to the adsorbent material.

In addition, the adsorbents may be filled in plural numbers for each target gas or filled with one gas as a target according to the conversion efficiency of the catalyst unit.

In addition, when the adsorption reaction generated in the adsorption unit is an exothermic reaction, the flow of waste gas may be induced from the top to the bottom.

In addition, the apparatus body may be configured as at least one series configuration to perform at least one catalyst-adsorption reaction.

In addition, it is possible to modify the shape of the device body according to the type and appearance of the catalyst applied to the catalyst unit.

In addition, one of an electric heater, a gas burner, and a plasma may be used as a heat source used in the heater unit.

In addition, the heat insulation unit, the heat insulating material which is installed in the outside, the outer wall of the device body to prevent heat transfer outside; And a heating jacket installed at a portion of the device body to heat the device body.

In addition, the auxiliary adsorption unit is installed between the heat exchange unit and the adsorption unit, the secondary adsorption unit capable of continuous adsorption by inducing the flow of waste gas through the change of the flow path when the adsorption unit is replaced.

The present invention provides a method for removing nitrogen oxides using a nitrogen oxide removal device for removing nitrogen oxides from waste gas generated in an industrial site, the method comprising: a heating step of providing a heat source to the nitrogen oxide removal device using a heater unit; An oxidation treatment step of oxidizing nitrogen oxide using a catalyst unit which oxidizes nitrogen oxide as an oxidation catalyst in the waste gas which has undergone the heating step; A heat exchange step of performing heat exchange using a heat exchange unit that lowers the temperature of the waste gas by lowering the reaction temperature to a predetermined temperature for the adsorption reaction after the oxidation treatment step; An adsorption step of adsorbing nitrogen oxide using an adsorption unit connected to the heat exchange unit and adsorbing nitrogen oxides having passed through the heat exchange unit; And a heat insulation step provided on the outside of the device body to insulate the oxide removal device by using the heat insulation unit that blocks the device body from the outside air.

According to one embodiment of the present invention, in the treatment of nitrogen oxides introduced in the semiconductor process, by converting the adsorption to the easily adsorbable material, it can have a high adsorption efficiency and the effect of reducing the operating cost.

In addition, there is no use of chemicals in the gas or liquid, which can prevent the occurrence of related leaks, explosions, fires, etc.

However, the effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.
1 is an overall flow conceptual diagram of an apparatus and method for removing nitrogen oxides contained in waste gas using an adsorbent according to an embodiment of the present invention.
2 is a conceptual diagram of the nitrogen oxide removal device.
3 is a configuration diagram of the removal device.
4 is an overall block diagram of the removal device.
Figure 5 is a flow chart of a method for removing nitrogen oxides contained in the waste gas by using the adsorbent according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiments may be variously modified and may have various forms, the scope of the present invention should be understood to include equivalents for realizing the technical idea. In addition, the objects or effects presented in the present invention does not mean that a specific embodiment should include all or only such effects, the scope of the present invention should not be understood as being limited thereby.

The meaning of the terms described in the present invention will be understood as follows.

Terms such as "first" and "second" are intended to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. When a component is referred to as being "connected" to another component, it should be understood that there may be other components in between, although it may be directly connected to the other component. On the other hand, when a component is said to be "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring", should be interpreted as well.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and terms such as "include" or "have" refer to features, numbers, steps, operations, components, parts, or parts thereof described. It is to be understood that the combination is intended to be present and does not exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, actions, components, parts or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Generally, the terms defined in the dictionary used are to be interpreted to coincide with the meanings in the context of the related art, and should not be interpreted as having ideal or excessively formal meanings unless clearly defined in the present invention.

1 is a conceptual diagram illustrating an overall flow of an apparatus and a method for removing nitrogen oxide contained in waste gas using an adsorbent according to an embodiment of the present invention, FIG. 2 is a conceptual diagram of the nitrogen oxide removing device, and FIG. 4 is a schematic block diagram of the removal apparatus, and FIG. 5 is a flowchart illustrating a method for removing nitrogen oxides contained in waste gas using an adsorbent according to an embodiment of the present invention.

As shown in Figure 1 to Figure 5, as a device for removing nitrogen oxides from the waste gas generated in the industrial field, the present invention is the apparatus body 100, heater unit 200, catalyst unit 300, heat exchange unit ( 400), the adsorption unit 500 and the heat insulation unit 600 may be included.

Nitrogen oxides play an important role in many chemical reactions in the air. Another form of nitric oxide (NO3) is formed in the dark, which controls the chemical reaction in the atmosphere at night. Nitrogen oxides react with water to form nitric acid (HNO3), which is a major cause of acid rain. Because of acid rain, nitrogen oxides play a key role in the removal of nitrogen oxides from the air by precipitation or by washing them off.

Nitric acid is also a cloud particle in the polar stratosphere, which is a mixture of water and nitric acid called NAT (Nitric Acid Trihydrate) and is known as a cause of destruction of the polar ozone layer. During the day, nitrogen monoxide and nitrogen dioxide are in equilibrium with each other. The ratio of nitrogen monoxide to nitrogen dioxide is determined by sunlight and ozone, which converts nitrogen dioxide to nitrogen monoxide and vice versa. Nitrogen monoxide and nitrogen dioxide play an important role in the formation and destruction of ozone in the troposphere.

The apparatus main body 100 is formed while the gas inlet 30 and the gas outlet 50 correspond to each part, it is possible to purify the outflowing waste gas flowing out.

The apparatus body 100 may be configured as at least one in-line configuration to perform at least one catalyst-adsorption reaction.

The heater unit 200 may be connected to the gas inlet 30 in the apparatus body 100 to provide a heat source.

As a heat source used in the heater unit 200, one of an electric heater, a gas burner, or a plasma may be used. In the case of plasma, the heat of a gaseous substance is continuously heated to raise the temperature, and an aggregate of particles composed of an ion nucleus and free electrons is formed. Along with the three forms of matter, solid, liquid and gas, it is called the 'fourth material state', and this state of matter is called plasma.

Specifically, the use of plasma can be used to synthesize artificial diamond, and the surface coating treatment with plasma on the metal remains discovered in the ancient ruins can prevent wear or corrosion and can improve the state of the remains. Plasma Display Panels (PDPs) using light emitted from plasma are widely used throughout the industry, and PDP TVs are typical. In addition, plasma can be used to replace fossil fuels such as petroleum and coal through nuclear fusion, and major developed countries around the world are actively researching for developing alternative energy sources using plasma.

The catalyst unit 300 may be connected to the heater unit 200 to oxidize nitrogen oxide using an oxidation catalyst while receiving a heat source generated by the heater unit 200.

The oxidation catalyst can convert nitrogen monoxide into nitrogen dioxide in nitrogen oxides. In addition, in addition to nitrogen oxides, it may be converted to H2O and CO2 by oxidizing materials such as VOCs. Specifically, the catalyst unit 300 is to convert nitrogen monoxide into nitrogen dioxide using an oxidation catalyst using various nitrogen oxides such as nitrogen monoxide and nitrogen dioxide.

Nitrogen oxide removal device 10 of the present invention is based on the principle that it is possible to remove by adsorption relatively easily compared to nitrogen monoxide, which is a material before conversion of nitrogen dioxide converted using a catalyst.

Specifically, the role of the catalytic unit 300 is to convert nitrogen oxides, such as nitrogen monoxide, nitrogen dioxide, and the like, which are variously configured, into an adsorbent to be used as an adsorption target, and may also serve as an oxidative removal role such as VOCs. That is, nitrogen monoxide (NO) in the nitrogen oxides is converted to nitrogen dioxide (NO2), and the converted nitrogen dioxide is removed by using an adsorbent.

As for VOCs (Volatile Organic Compounds), VOCs are hydrocarbon compounds that volatilize in the atmosphere and produce odors or ozone. They are carcinogens that cause disorders in the nervous system through skin contact or respiratory inhalation. Benzene, formaldehyde, toluene, xylene, ethylene, styrene, acetaldehyde and the like are collectively referred to.

These VOCs usually cause odors even at low concentrations, and as compounds themselves, are directly harmful to the environment and the human body, or participate in photochemical reactions in the air to produce secondary pollutants such as photochemical oxides.

VOCs are mainly generated in the manufacturing and storage process of petrochemical oil refining coating factory, automobile exhaust, construction materials such as paint and adhesives, and storage tanks of gas stations.

The shape of the apparatus main body 100 may be modified according to the type and shape of the catalyst applied to the catalyst unit 300. It can be applied in various ways such as.

The heat exchange unit 400 may lower the temperature of the waste gas by lowering the reaction temperature to a predetermined temperature for the adsorption reaction of the waste gas discharged from the catalyst unit 300. That is, the exchange unit 400 may lower the gas discharged from the catalyst unit 300 to a temperature suitable for adsorption.

The adsorption unit 500 is connected to the heat exchange unit 400 and may adsorb the nitrogen oxide that has passed through the heat exchange unit 400 using an adsorbent.

Adsorption unit 500 is provided with an adsorbent at the rear to perform the adsorption removal role, the interior may be configured to be separated in multiple stages and may have a structure in which at least one or more porous plates are partitioned by zone corresponding to the adsorption material.

When the adsorption reaction generated in the adsorption unit 500 is an exothermic reaction, the flow of the waste gas may be induced from the top to the bottom. In addition, the adsorption unit 500 is manufactured in a configuration that is divided into one, two stages can be adsorbed step by step.

The adsorbent may be filled in plural numbers for each target gas or filled with one gas as a target according to the conversion efficiency of the catalyst unit 300.

In the case of an adsorbent, adsorption is a phenomenon in which molecules of a gas or a solution stick to a solid surface, and an adsorbent is a solid material that accepts adsorption. The adsorbent having a large surface area adsorbed per unit volume of the adsorbent is an excellent adsorbent. Activated carbon, alumina, and the like are used industrially, and charcoal for soaking soy sauce is also included.

The adsorbed material is called adsorbate. Liquids and glass can also be adsorbents and are distinguished from absorption, a phenomenon in which molecules melt into the interior of a solid or liquid. If the surface is rough or porous, the effective surface area (specific surface area) for the unit volume (or unit weight) of the adsorbent is large, so that the amount of adsorption increases, resulting in an excellent adsorbent. Commonly used adsorbents are activated carbon, diatomaceous earth, zeolite. Silica gel, starch, bentonite, alumina and the like. In Korea, when the soy sauce is soaked in traditional methods, the charcoal that floats in it is an example of an adsorbent to remove impurities by adsorption.

The purpose of using the adsorbent is to purify the material by removing impurities, decolorization to remove color from the product by adsorbing pigments, remove moisture, remove odors, separate substances, and so on. It is also important to use the catalyst as a catalyst to speed up the reaction. In chromatography, the adsorbent separates different molecules. The amount of adsorption increases with the concentration or pressure of the substance adsorbed at a constant temperature, and its quantitative relationship is represented by various adsorption isotherms. It is common for the adsorption amount to decrease as the temperature rises. In general, the adsorbed material may be accumulated below the monomolecular layer or in the multimolecular layer.

The heat insulation unit 600 may block the heat of the device body 100 from being carried out to the outside to a part of the device body 100. The insulation unit 600 may include an insulation 610 and a heating jacket 620.

The heat insulator 610 may be installed inside or outside the outer wall of the apparatus body to prevent heat transfer from the outside. Specifically, the heat insulating material 610 (heat insulating material) is a material for reducing the heat loss or heat inflow to the outside by covering the outside of the portion to maintain a constant temperature, cold insulation material of less than 100 ℃ depending on the temperature used It is divided into insulation material, insulation material of 100 ~ 500 ℃, heat insulation material of 500 ~ 1,100 ℃, and fireproof insulation material of 1,100 ℃ or more, and it is made to be porous to reduce thermal conductivity. .

The material of the heat insulating material 610 is largely divided into organic and inorganic, and organic materials include cork, cotton, felt, cork carbide, foam rubber, and the like, and are suitable for use at about 150 ° C. or lower. As minerals, asbestos, glass wool, quartz wool, diatomaceous earth, magnesium carbonate powder, magnesia powder, calcium silicate, pearlite and the like are used, and most of them can withstand high temperatures. These are the limits used by the softening and decomposition temperature of each material.

The heating jacket 620 may be installed at a portion of the device body to heat the device body 100. Specifically, the heating jacket 620 is made of a Teflon material, and has heat resistance, non-adhesiveness, chemical resistance, and insulation, so that deformation and breakage may be prevented and the service life may be further extended.

The heater unit 200 and the catalyst unit 300 may be integrally manufactured to facilitate heat transfer.

The nitrogen oxide removal device 10 of the present invention may further include an auxiliary adsorption unit 700.

The auxiliary adsorption unit 700 is installed between the heat exchange unit 400 and the adsorption unit 500 to allow continuous adsorption by inducing the flow of waste gas or gas by changing the flow path when the adsorption unit 500 is replaced.

Figure 5 is a flow chart of a method for removing nitrogen oxides contained in the waste gas by using the adsorbent according to an embodiment of the present invention.

As shown in Figure 5, as a method for removing nitrogen oxides to remove nitrogen oxides from the waste gas generated in the industrial field, the present invention is a heating step (S100), oxidation treatment step (S200), heat exchange step (S300), Adsorption step (S400) and adiabatic step (S500) can be made, including.

The heating step S100 is a step of providing a heat source to the nitrogen oxide removing device using the heater unit 200.

The oxidation treatment step (S200) is a step of oxidizing nitrogen oxide using a catalyst unit 300 for oxidizing nitrogen oxide to an oxidation catalyst from the waste gas which has undergone the heating step (S100).

The heat exchange step S300 is a step of heat exchange using the heat exchange unit 400 which lowers the temperature of the waste gas by lowering the reaction temperature to a predetermined temperature for the adsorption reaction after the oxidation treatment step S200.

Adsorption step (S400) is a step of adsorbing nitrogen oxide using the adsorption unit 500 is connected to the heat exchange unit 400 and adsorbs the nitrogen oxide passed through the heat exchange unit 400.

The thermal insulation step (S500) is a step of insulating the nitrogen oxide removal device 10 by using the thermal insulation unit 600 which is provided on the outside of the apparatus body 100 to block the apparatus body 100 from the outside air.

Nitrogen oxide removal method using the nitrogen oxide removal device of the present invention is installed between the heat exchange unit 400 and the adsorption unit 500 to change the flow of the waste gas through the change of the flow path when the adsorption unit 500 is replaced. It may further include the step of auxiliary adsorption by using the auxiliary adsorption unit 700 capable of continuous adsorption.

Hereinafter, descriptions of the respective components are the same as described above, and thus will be omitted.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable those skilled in the art to implement and practice the invention. Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made without departing from the scope of the present invention. For example, those skilled in the art can use each of the components described in the above-described embodiments in combination with each other. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention. The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, the claims may be incorporated into claims that do not have an explicit citation relationship in the claims, or may be included as new claims by amendment after filing.

10: nitrogen oxide removal device
30: gas inlet
50: gas outlet
100: device body
200: heater unit
300: catalyst unit
400: heat exchange unit
500: adsorption unit
600: insulation unit
610: heat insulation
620: heating jacket
700: auxiliary adsorption unit

Claims (11)

As a device for removing nitrogen oxides from waste gas generated in industrial sites,
A gas inlet and a gas outlet are formed at a portion thereof to correspond to each other to purify and discharge the introduced waste gas;
A heater unit connected to the gas inlet inside the apparatus body to provide a heat source;
A catalyst unit connected to the heater unit to oxidize nitrogen oxide using an oxidation catalyst while receiving a heat source generated by the heater unit;
A heat exchange unit which lowers the temperature of the waste gas by lowering the gas discharged from the catalyst unit to a temperature set for the adsorption reaction;
An adsorption unit connected to the heat exchange unit and adsorbing nitrogen oxide having passed through the heat exchange unit using an adsorbent; And
And a heat insulation unit provided at a portion of the device body to block heat of the device body from being carried out to the outside.
The heater unit and the catalyst unit is a device for removing nitrogen oxides contained in the waste gas by using an adsorbent, characterized in that it is made integrally to facilitate heat transfer. The method according to claim 1,
The oxidation catalyst is a device for removing nitrogen oxides in the waste gas using an adsorbent, characterized in that for converting nitrogen monoxide into nitrogen dioxide in the nitrogen oxides. The method according to claim 1,
The adsorption unit,
Adsorption is provided at the rear to perform adsorption and removal, and the interior is separable in multiple stages and at least one porous plate is partitioned by zone corresponding to the adsorbent to remove nitrogen oxides from the waste gas. Device. The method according to claim 1,
The adsorbent is a device for removing nitrogen oxides in the waste gas using an adsorbent, characterized in that each of the target gas is filled with a plurality of target gas, or one of the target gas in accordance with the conversion efficiency of the catalyst unit. The method according to claim 1,
When the adsorption reaction generated in the adsorption unit is an exothermic reaction, the apparatus for removing nitrogen oxides in the waste gas by using an adsorbent, characterized in that the flow of the waste gas from the top to the bottom by gravity. The method according to claim 1,
The apparatus body is configured as at least one in-line configuration to remove nitrogen oxides in the waste gas using an adsorbent, characterized in that to perform at least one catalyst-adsorption reaction. The method according to claim 1,
Apparatus for removing nitrogen oxides in the waste gas using an adsorbent, characterized in that the shape of the device body can be modified depending on the type and appearance of the catalyst applied to the catalyst unit. The method according to claim 1,
Apparatus for removing nitrogen oxides in the waste gas by using an adsorbent, characterized in that using one of the electric heater, gas burner or plasma as a heat source used in the heater unit. The method according to claim 1
The heat insulation unit,
Insulation material is installed in, the outside of the outer wall of the device body to prevent heat transfer outside; And
And a heating jacket installed on a part of the apparatus main body to heat the apparatus main body. The method according to claim 2,
An auxiliary adsorption unit installed between the heat exchange unit and the adsorption unit to allow continuous adsorption by inducing the flow of waste gas by changing a flow path when the adsorption unit is replaced; waste gas using an adsorbent further comprising: Device for removing heavy nitrogen oxides. A method of removing nitrogen oxides using a nitrogen oxide removal device for removing nitrogen oxides from waste gas generated in an industrial site,
A heating step of providing a heat source to the nitrogen oxide removing device using a heater unit;
An oxidation treatment step of oxidizing nitrogen oxide using a catalyst unit which oxidizes nitrogen oxide as an oxidation catalyst in the waste gas which has undergone the heating step;
A heat exchange step of performing heat exchange using a heat exchange unit that lowers the temperature of the waste gas by lowering the reaction temperature to a predetermined temperature for the adsorption reaction after the oxidation treatment step;
An adsorption step of adsorbing nitrogen oxide using an adsorption unit connected to the heat exchange unit and adsorbing nitrogen oxides having passed through the heat exchange unit; And
Remove the nitrogen oxide contained in the waste gas by using an adsorbent, characterized in that it comprises a; heat insulating step of insulating the oxide removal device by using an insulation unit which is provided on the outside of the device body to block the device body from the outside air How to.

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