KR101805021B1 - Method for treating fine dust and harmful gas - Google Patents

Abstract

Disclosed is a method for treating fine dust and harmful gas. According to the present invention, the fine dust and harmful gas treating method includes a process of mixing the fine dust and first harmful gas generated in a flame retardant agent coating operation with second harmful gas at a high temperature. An adhesive agent used to coat the flame retardant agent on a material is heated and melts after being discharged from a coating apparatus, thereby losing adhesive properties. When a mixture of the fine dust, first harmful gas, adhesive agent without the adhesive properties, and second harmful gas flows into a cyclone unit, the cyclone unit sprays water to remove the particles from the mixture. The remaining particles in the mixture are removed in a medium filter. The harmful gas and untreated particles of the mixture are partially removed in a combustion treatment unit. The particles of the mixture not treated in the combustion treatment unit can be removed in a semi-drying type reactor and a back-filter, thereby removing ultrafine dust as well as the harmful gas.

Description

METHOD FOR TREATING FINE DUST AND HARMFUL GAS BACKGROUND OF THE INVENTION [0001]

TECHNICAL FIELD The present invention relates to a method for treating fine dust and noxious gas to treat fine dust and noxious gas generated when a flame retardant is coated.

Styrofoam, a polystyrene resin foam, is widely used as a heat insulating material for insulation and cold storage, a packaging material for a product, and a cushioning material because it has excellent molding processability, heat insulating property and shock absorbing ability. However, since styrofoam is a thermoplastic resin, it is not easily melted at a high temperature due to low heat resistance, and is easily burned in a fire when a fire occurs.

Flame and noxious gas are generated during the printing of styrofoam, so styrofoam is used as flame retardant. As a method of softening styrofoam, inorganic flame retardant or organic flame retardant is coated on the surface of styrofoam. In addition, when the water-soluble resin is used as a flame retardant, the productivity is lowered.

When a non-water-soluble inorganic flame retardant is coated on a styrofoam, methanol is mixed with the flame retardant and diluted, followed by coating with styrofoam. Inorganic flame retardant flame retardants include borax-containing flame retardants.

When the flame retardant is coated on the flame-retardant material as described above, the flame retardant that is not coated on the material is discharged in the form of fine dust, and the methanol is vaporized and becomes harmful gas and discharged together with the fine dust . At this time, not only the fine dust having a diameter of 10 μm or less to be regulated but also a large amount of ultrafine dust having a diameter of 2.5 μm or less not to be regulated is contained in the discharged fine dust.

Conventionally, a combustion device or a bag filter has been used to remove fine dust and noxious gas generated in the production of a flame retardant material. However, the ultrafine dust of 2.5 占 퐉 or less is not combusted in the above combustion apparatus, and is not filtered by the bag filter, so that ultrafine dust of 2.5 占 퐉 or less can not be treated.

Prior art relating to the treatment of fine dust and noxious gas is disclosed in Korean Patent Registration No. 10-0928344 (November 26, 2009).

It is an object of the present invention to provide a method for treating fine dust and noxious gas which can solve all the problems of the prior art as described above.

Another object of the present invention is to provide a method for treating fine dust and noxious gas which can remove not only fine dust including ultrafine dust but also harmful gas.

According to an aspect of the present invention, there is provided a method of treating fine dust and noxious gas according to an embodiment of the present invention. The method includes the steps of: preparing fine dust and noxious gas to treat minute dust and noxious gas generated when coating a flame- (A) mixing fine dust, a first noxious gas, and an adhesive added and discharged when a coating is applied to a flame retardant, with hot air; (b) removing particles of the composite material in which the fine particles, the first noxious gas, the adhesive melted by hot air, and hot air are mixed; (c) removing noxious gas from the composite material from which the particles have been removed; (d) removing particles of the clean composite material from which the harmful gas has been removed.

In the method for treating fine dust and noxious gas according to an embodiment of the present invention, the fine dust and the first noxious gas generated during the coating of the flame retardant are mixed while being heated with the second noxious gas which is hot air. Then, among the adhesives for coating the flame retardant on the material, since the adhesive discharged from the coater is heated without being used, the unused adhesive discharged from the coater is melted by hot air to remove the adhesiveness. Then, when the composite material mixed with the fine dust, the first noxious gas, the adhesive removed from the adhesive and the second noxious gas is introduced into the cyclone, particles of the composite material are removed while spraying water from the cyclone, The particles of the composite material are removed from the medium filter. Then, the noxious gas of the composite material and a part of the untreated particles are removed in the combustion processing unit. Thereafter, the particles of the composite material not removed in the combustion treatment unit are removed from the semitransparent reactor and the bag filter, so that it is possible to remove not only noxious gas but also ultrafine dust.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a configuration of a fine dust and noxious gas processing system according to an embodiment of the present invention; FIG.
FIG. 2 is a flowchart illustrating a method of treating fine dust and noxious gas according to an embodiment of the present invention. FIG.

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

It should be understood that the term "and / or" includes all possible combinations from one or more related items. For example, the meaning of "first item, second item and / or third item" may include not only the first item, the second item or the third item but also two of the first item, Means a combination of all items that can be presented from the above.

It is to be understood that when an element is referred to as being "connected or installed" to another element, it may be directly connected or installed to another element, although other elements may be present in between. On the other hand, when an element is referred to as being "directly connected or installed" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

In each step, the identification codes (for example, S100, S110, S120, etc.) are used for convenience of explanation, and the identification codes do not describe and explain the order of each step, Unless the order is described, it may happen differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

Hereinafter, a method for treating fine dust and noxious gas according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a configuration of a fine dust and noxious gas processing system according to an embodiment of the present invention.

As shown, the fine dust and noxious gas treatment system according to the present embodiment includes a chamber 110, a cyclone 120, a medium filter 140, a combustion processing unit 150, a semi-dry reactor (SDR) A dry reactor 160, and a bag filter 170.

In the chamber 110, the fine dust and the first noxious gas generated when the flame retardant is coated on a material such as Styrofoam may be introduced into the coater. Of the adhesives for coating the flame retardant on the material, unused adhesives may be discharged from the coater together with the fine dust and the first noxious gas in the chamber 110. In addition, hot air for heating and melting the unused adhesive discharged from the coater may be introduced into the chamber 110. At this time, the fine dust, the first harmful gas, and the hot air can be mixed in the chamber 110.

The flame retardant may be a flame retardant containing borax. Borax is water-soluble, but borax-containing flame retardant is water-insoluble and can be diluted by adding methanol and then coated on the material. In this case, when the flame retardant is coated on the material in the coater, the flame retardant which is not coated on the material can be discharged in the form of fine dust, and the methanol is vaporized and becomes the first noxious gas and discharged together with the fine dust . Then, the unused adhesive may be discharged together with the fine dust and the first noxious gas.

The adhesive is adhered to the cyclone 120, the medium filter 140 and the heat accumulating member 153 of the combustion processing unit 150 and the low temperature catalyst 157 to be described later, and the cyclone 120, The medium filter 140 and the combustion processing unit 150 can be damaged. Therefore, the adhesive property of the adhesive should be removed. Hot air is supplied to the chamber 110 to remove the adhesiveness of the adhesive, and hot air causes the adhesive to melt. Then, the adhesive property of the adhesive may be lowered or removed.

The fine dust discharged from the coater includes fine dust having a diameter of not more than 10 mu m as a target to be regulated and ultrafine dust having a diameter of not more than 2.5 mu m which is not subject to regulation.

The hot air supplied to the chamber 110 may be a high-temperature second noxious gas containing a volatile organic compound. That is, since the adhesive introduced into the chamber 110 is melted by using the second harmful gas of high temperature generated in the industrial field using the organic solvent, a separate heat source for melting the adhesive of the chamber 110 Not required. Therefore, energy can be saved.

The material discharged from the chamber 110 is a composite material in which fine dust, a first noxious gas, an adhesive removed from the adhesive, and a second noxious gas that is a hot air are mixed.

Particles of the composite material exiting the chamber 110 may be removed from the cyclone 120 and the medium filter 140. At this time, the particles may include fine dust, a first noxious gas, an adhesive removed from the adhesive, and a foreign matter contained in the second noxious gas.

Hereinafter, the first harmful gas and the second harmful gas are referred to as noxious gas.

The cyclone 120 may remove particles of the composite material exiting the chamber 110. The cyclone 120 may be formed in a substantially conical shape, and the composite material may flow upward into the cyclone 120 and descend while rotating along the inner circumferential surface of the cyclone 120. The particles of the composite material are discharged to the outside through the lower side of the cyclone 120 due to their own weight and include the particles that are not discharged to the lower side of the cyclone 120 while the airflow swirls upward at the substantially lower end side of the cyclone 120 The composite material can be discharged to the outside of the cyclone 120.

An injection part 130 for injecting water from the upper side to the lower side of the cyclone 120 is provided on the upper part of the cyclone 110 in order to more easily remove the particles of the composite material flowing into the cyclone 120 from the chamber 110. [ Can be installed. When the jetting part 130 injects water into the cyclone 120, particles of the composite material of the cyclone 120 become wet by water, so that the weight of the composite material particles of the cyclone 120 becomes heavy. Then, the particles of the composite material of the cyclone 120 are easily dropped to the lower side of the cyclone 120, so that particles of the composite material of the cyclone 120 can be more easily removed.

The adhesive that is a part of the particles of the composite material is not adhered to the inner circumferential surface of the cyclone 120 because the adhesive is melted and removed.

Since the borax in the flame retardant containing borax readily melts in hot water, it is preferable that the water sprayed from the jetting unit 130 is warm water at around 15 ° C, which is normal temperature, and a plurality of cyclones 120 can be installed.

The composite material discharged from the cyclone 120 may contain particles that are not removed from the cyclone 120 and particles of the composite material discharged from the cyclone 120 may be removed from the medium filter 140. The medium filter 140 can collect and remove the particles contained in the composite material discharged from the cyclone 120, and can smell the odor of the composite material.

The composite material discharged from the cyclone 120 may contain an adhesive agent, which is a part of the particles, but is not adhered to the medium filter 140 because the adhesive is melted to remove adhesiveness.

Particles of the composite material are removed in the cyclone 120 and the medium filter 140, but the fine particles may not be removed. As a result, the harmful gas and particles of the composite material discharged from the medium filter 140 can be removed from the combustion processing unit 150.

The combustion processing unit 150 may include a body 151 having a combustion chamber 151a formed in an upper portion of the combustion chamber 151. A hollow body formed of a ceramic material may be provided at a portion of the body 151 below the combustion chamber 151a, The heat accumulating member 153 may be provided.

The composite material discharged from the medium filter 140 may flow into the combustion chamber 151a through the heat accumulating member 153. [ The noxious gas of the composite material flowing into the combustion chamber 151a is burnt in the combustion chamber 151a, and when the noxious gas of the composite material is burnt in the combustion chamber 151a, the composite material can be in a clean state. Therefore, the composite material discharged to the outside of the combustion processing unit 150 is in a clean state. At this time, a part of particles of the composite material flowing into the combustion chamber 151a may be burned and removed.

The inside of the main body 151 provided with the heat accumulating member 153 can be divided into a plurality of regions radially with respect to the center of the main body 151 and the heat accumulating members 153 are partitioned in the divided regions. The composite material discharged from the combustion chamber 151a passes through the heat accumulating member 153 and is discharged to the outside of the main body 151. The heat accumulating member 153 absorbs heat from the composite material discharged from the combustion chamber 151a and accumulates the heat .

The portion of the main body 151 provided with the heat accumulating member 153 can be divided into a region through which the composite material containing the harmful gas passes, a region through which the clean composite material passes, and a region through which the purge gas passes. The composite material containing the harmful gas, the clean composite material, and the purge gas can pass through the divided heat accumulating members 153 one by one and sequentially circulate through the divided heat accumulating members 153.

A divided heat accumulating member 153 is installed on the lower surface of the main body 151 so that the regenerating member 153 can sequentially pass through the heat accumulating members 153 partitioning the composite material containing the noxious gas, the clean composite material, and the purge gas A valve 155 may be provided to independently open and close portions of the body 151.

The combustion processing unit 150 may be the same as or similar to the configuration of the regenerative combustion oxidizing apparatus disclosed in Korean Patent Registration No. 10-1560256 (Oct. 16, 2015) filed and filed by the present applicant.

The combustion processing unit 150 according to the present embodiment may further include a low temperature catalyst 157 for removing noxious gas of the composite material flowing into the main body 151. The low-temperature catalyst 157 may be formed of metal, and may remove a part of harmful gas of the complex material flowing into the main body 151, and may remove odors. The low-temperature catalyst 157 may be installed on the lower surface of the main body 151, more specifically, between the regenerating members 153 and adjacent to the lower surface of the main body 151.

The composite material discharged from the medium filter 140 may contain an adhesive agent, which is a part of particles, but is not adhered to the low temperature catalyst 157 because the adhesive is melted and the adhesiveness is removed. The composite material discharged from the combustion processing unit 150 is a clean composite material from which the adhesive is also removed.

Particles contained in the clean composite material discharged from the combustion processing unit 150 can be removed from the semitransparent reactor 160 and the bag filter 170.

The semi-cylindrical reactor 160 injects a liquid such as water into the inflowing composite material, and then dries it. In detail, the semitransparent reactor 160 injects a liquid into the introduced composite material so that the particles of the composite material are fused by the liquid. The particles of the composite material are then coarsened and the coarsened composite material is dried. Part of the dried composite material is then discharged to the lower side of the semitransparent reactor 160 and fine particles not removed in the semitransparent reactor 160 are introduced into the bag filter 170.

The semitransparent reactor 160 may include a nozzle 162 for injecting liquid and a drying means for generating heat.

Fine particles that have not been removed from the semi-dry reactor 160 can be introduced into the bag filter 170 and removed from the bag filter 170 and the composite material discharged from the bag filter 170 can be removed from the clean composite Material.

Between the bag filter 170 and the stack 180, a cooler for removing the humid air of the composite material discharged from the bag filter 170 may be installed. Since the humid air of the composite material discharged from the bag filter 170 is condensed and removed from the cooler, the composite material discharged from the cooler is discharged to the atmosphere through the stack 180 and is subjected to heat exchange with a relatively low temperature atmosphere White smoke does not occur.

A method of treating fine dust and noxious gas according to an embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig. 2 is a flowchart illustrating a method of treating fine dust and noxious gas according to an embodiment of the present invention.

As shown in the figure, in step S110, the fine dust and the first noxious gas generated in coating the flame retardant in the coater, and the adhesive which is discharged when the first noxious gas and the adhesive added during coating are discharged, Lt; / RTI > At this time, the flame retardant contains borax and can be diluted with methanol and coated on the material.

The fine dust, the first noxious gas and the adhesive may be mixed by hot air, and the hot air may be a high-temperature second noxious gas including a volatile organic compound generated in an industrial field using an organic solvent. Then, since the adhesive is melted by the second harmful gas which is a hot air, a separate heat source (heat source) for melting the adhesive is not needed, and thus energy can be saved.

When the adhesive is melted, the adhesiveness of the adhesive is lowered or removed, so that it is possible to prevent the components from being damaged by the adhesive contained in the composite material discharged from the chamber 110.

Thereafter, in step S130, the particles of the composite material in which the fine dust, the first noxious gas, and the adhesive melted by hot air and hot air are mixed can be removed. At this time, the step of removing the particles of the composite material (S130) includes a step (S131) of removing the particles of the composite material by the cyclone 120 (S131) and a step of removing the particles of the composite material by passing through the medium filter 140 .

When particles of the composite material are removed in the cyclone 120, water may be sprayed into the cyclone 120 to wet the particles of the composite material. Then, since the particles of the composite material of the cyclone 120 are wetted by water, the weight of the composite material particles of the cyclone 120 becomes heavy. As a result, the particles of the composite material of the cyclone 120 easily fall to the lower side of the cyclone 120, so that particles of the composite material of the cyclone 120 can be more easily removed. Since borax in the flame retardant containing borax readily melts in hot water, it is preferable that the water sprayed into the inside of the cyclone 120 is warm water around 15 ° C which is normal temperature.

The medium filter 140 can collect and remove the particles contained in the composite material discharged from the cyclone 120, and can smell the odor of the composite material.

Thereafter, in step S150, the noxious gas of the composite material discharged from the medium filter 140 is removed, and the noxious gas of the composite material from which the particles are removed can be removed by the catalyst and the combustion .

In step S170, the particles of the clean composite material from which the noxious gas has been removed can be removed. In step S170, the particles of the clean composite material from which the noxious gas has been removed are removed firstly in the semi-cylindrical reactor 160 (Step S171), and a step (S175) of removing the second filter from the bag filter 170. [

When particles of the composite material are removed in the semi-cylindrical reactor 160, the particles of the composite material may be fused by spraying a liquid with the composite material of the semi-cylindrical reactor 160, followed by coarsening and drying. When the particles of the composite material are coarsened, they can be easily discharged to the lower side of the semitransparent reactor 160 and removed.

Thereafter, the fine particles that have not been removed from the semi-dry reactor 160 are removed from the bag filter 170, and the clean composite material from which the particles discharged from the bag filter 170 have been removed can be discharged through the stack 180 (S190).

The clean composite material from which the particles discharged from the bag filter 170 have been removed can be discharged to the atmosphere through the stack 180 after the wet steam is removed while passing through the cooler.

The method for treating fine dust and noxious gas according to this embodiment mixes the fine dust and the first noxious gas generated when the flame retardant is coated on the product while heating the noxious gas with the second noxious gas which is hot air. Then, the adhesive of the coater discharged together with the fine dust and the first noxious gas is melted by the second harmful gas, which is the hot air, so that the adhesiveness of the adhesive is lowered or removed. Thereafter, particles of the composite material are removed from the cyclone 120 while spraying water with a composite material that is a mixture of fine dust, a first noxious gas, a molten adhesive, and a second noxious gas. After the particles of the composite material not removed from the cyclone 120 are removed from the medium filter 140, the combustion processing unit 150 removes a part of the noxious gas and untreated particles of the composite material. Then, the remaining particles of the composite material are removed in the semi-cylindrical reactor 160 and the bag filter 170, so that not only noxious gas but also ultrafine dust can be removed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of. Therefore, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention.

110: chamber
120: Cyclone
130:
140: medium filter
150: Combustion treatment device
160: Semi-annular reactor
170: bag filter

Claims (8)

A method for treating fine dust and noxious gas to treat fine dust and noxious gas generated when a non-combustible flame retardant is coated on a material,
(a) mixing the fine dust discharged during the coating of the flame retardant, the first noxious gas and the adhesive added during the coating process with unused adhesive discharged in hot air;
(b) removing the particles of the composite material in which the fine particles, the first noxious gas, and the hot air mixed with the hot molten adhesive are mixed, from the cyclone, and then passing through a medium filter to remove the particles;
(c) removing noxious gas from the composite material from which the particles have been removed;
(d) removing the particles of the clean composite material from which harmful gas has been removed from the semi-dry reactor (SDR), passing through a bag filter,
The flame retardant contains borax and is diluted with methanol and coated on the material,
Hot air is a second harmful gas at a high temperature including a volatile organic compound,
Wherein when the particles of the composite material are removed from the cyclone, water is sprayed into the cyclone to thereby wet the composite material particles to melt the borax of the composite material,
Water injected into the inside of the cyclone is 15 DEG C,
When the composite material flows into the semi-dry type reactor, the liquid is injected into the semi-dry type reactor to fuse particles of the composite material to coarse particles,
Further comprising the step of condensing and removing the humid air contained in the composite material discharged from the bag filter. delete delete delete delete The method according to claim 1,
Wherein the step (c) comprises catalytically removing and burning noxious gas of the composite material from which the particles have been removed. delete delete

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