KR20230074669A - Filtering system to remove harmful gas generated during asphalt concrete manufacturing process - Google Patents

Abstract

A filtering system for removing harmful gases is disclosed.
The disclosed present invention passes harmful substances such as sulfur compounds, aldehydes, VOCS (volatile organic compounds), and benzopyrene included in various harmful gases generated during the process of regenerating asphalt in an asphalt regeneration facility through a chemical adsorption filter. A filtering system for removing harmful gases generated in the process of manufacturing ascon, which can reduce the atmospheric emission concentration of gases, comprising: a dust collection unit for collecting dust and foreign substances included in the high-temperature harmful gases; A cooling heat exchanger that cools the high-temperature harmful gas from which dust and foreign substances are filtered by the dust collecting unit to 50° C. or less; an adsorption filter unit for filtering harmful substances contained in the cooled harmful gas; and a ventilation unit for forcibly sucking the noxious gas through the dust collecting unit and the cooling heat exchanger and sending it to the adsorption filter unit.

Description

Filtering system to remove harmful gas generated during asphalt concrete manufacturing process}

The present invention relates to a filtering system for removing harmful gases generated during the ascon manufacturing process, and more particularly, to harmful gases such as sulfur compounds, aldehydes, VOCS (volatile organic compounds), and benzopyrene generated during the ascon manufacturing process. It relates to a filtering system for removing harmful gases generated in the process of manufacturing asphalt concrete, which can reduce the concentration of harmful gases emitted to the air by passing them through a chemical adsorption filter.

In general, asphalt-concrete is manufactured by heating and mixing aggregates such as gravel or crushed stone, additives, and asphalt, which is the residue left during classification according to classification of crude oil, under certain conditions, and is used as a material for various road pavements. Widely used.

In such an ascon manufacturing process, the aggregate transferred from the cold bin to the conveyor belt passes through a dryer to remove moisture contained in the aggregate and mix the aggregate with AP oil. After going through the process of heating the aggregate to a temperature suitable for the following, the heated aggregate goes through a hot elevator, a hot screen, and a hot bin to adjust the appropriate particle size. Aggregate whose particle size is adjusted is put into a mixer, and AP oil heated in the AP oil storage tank is put into the mixer in an appropriate amount through a metering tank and mixed with the aggregate to produce and manufacture Ascon.

Ascon produced through the above process is immediately loaded onto a truck and shipped to the laying site. The manufacturing process of the above-mentioned ascon is largely divided into 'storage facilities' of aggregate and stone powder and 'drying facilities' such as dryers, and heated aggregates are mixed with asphalt. It is classified into 'mixing facility' for mixing, 'dust collection facility' for air pollution prevention, 'ascon loading facility', etc. Among the above 5 major processes, all 4 processes except for 'storage facility' are closely related to the emission of odorous pollutants. there will be

As described above, air pollutants mainly emitted from the ascon manufacturing process are largely classified by the process to be treated and divided into two categories: ducted emission and fugitive emission. It is discharged after purification through facilities, and is mainly discharged from dryers, hot elevators, hot screens, hot bins, and mixing facilities.

On the other hand, free emissions include scattering dust generated during the loading process of asphalt concrete in trucks and the storage and transportation of aggregates such as cold bins.

In other words, the main pollutants are dust and organic fume generated by volatilization of AP oil, and the process of discharging organic fume, which is an odor-causing substance, is a recycled aggregate drying facility, an AP oil storage tank, and a hot mixing facility (Hot Mixer), the process of mixing aggregate and AP oil, and the process of loading manufactured asphalt into trucks.

The main contaminants include organic evaporation gas (fine droplets including VOCS when high-temperature aggregate and AP oil are mixed) and ammonia, aldehydes, and aromatics generated by evaporation of AP oil at high temperature, and the following [Table 1] is specifically shown in

[Table 1]

In addition, the deodorization method for each odor pollutant is shown in [Table 2] below.

[Table 2]

As described above, odors and pollutants generated during the asphalt concrete manufacturing process are the main culprits of very serious environmental pollution, and these pollutants are, first, difficult to identify with the naked eye, and second, odor pollutants are not emitted only through a single emission source. Since it is discharged sporadically rather than continuously under the operation of equipment facilities open to the atmosphere and outdoor field operation, not only are the sources diverse, but also the expectation of improvement in the removal investment cost is quite low, unlike other air pollutants. Third, odor pollutants are environmental pollution caused by the release of many types of substances into the atmosphere, and they exhibit complex characteristics in many aspects, so the problem of odor pollution is due to the complex nature of many types of compounds rather than single substances. Fourth, it is very difficult to objectively measure many odor pollutants that are detected in ppb units by the human sense of smell using analysis equipment, and the detection of odor is time, place, concentration, and component even by the same person. There is a problem that it can vary depending on .

However, the deodorization methods shown in [Table 2] cannot be perfect because each has its strengths and weaknesses, and odor-causing substances and concentrations at the odor removal site, process change, installation area, work flow, temperature, humidity, air volume, and secondary pollution treatment Although the most effective method should be selected in consideration of countermeasures and fuel used, the reality is that there are many difficulties such as excessive facility costs, management and operation costs, and maintenance.

1) Registered Patent Publication No. 10-1187291 (registered on September 25, 2012) 2) Registered Patent Publication No. 10-2176906 (registered on November 4, 2020)

Therefore, in order to solve the above problems, the present invention removes or minimizes air pollutants or other harmful dust generated in the asphalt concrete manufacturing process regardless of the above-mentioned conduit discharge and free discharge to prevent environmental pollution in advance. Its purpose is to prevent

The technical problem to be achieved in the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The present invention for achieving the above object is a chemical adsorption filter for harmful substances such as sulfur compounds, aldehydes, VOCS (volatile organic compounds), and benzopyrene contained in various harmful gases generated during the process of regenerating asphalt in an asphalt regeneration facility. A filtering system for removing harmful gases generated in the process of manufacturing ascon, which can reduce the atmospheric emission concentration of harmful gases by passing through, a dust collection unit for collecting dust and foreign substances contained in the high-temperature harmful gases; A cooling heat exchanger that cools the high-temperature harmful gas from which dust and foreign substances are filtered by the dust collecting unit to 50° C. or less; an adsorption filter unit for filtering harmful substances contained in the cooled harmful gas; And a ventilation unit for forcibly sucking the noxious gas through the dust collecting unit and the cooling heat exchanger and sending it to the adsorption filter unit.

Preferably, the adsorption filter unit is formed by arranging a filter package composed of a hexahedron-shaped cage and a plurality of filter cartridges inclined in a zigzag direction inside the cage in three or more stages vertically and horizontally in a filter housing. can

Preferably, the filter packages disposed in three or more stages vertically and horizontally are installed in two or more places along the moving direction of the harmful gas inside the filter housing, and a non-filtering section in which the filter package is not installed is provided between them. It can be.

Preferably, the filter cartridge includes upper and lower frames molded to fill the ion exchange resin with a uniform width in order to process and remove harmful substances included in the harmful gas; Non-woven fabrics fixed inside the upper and lower frames to prevent leakage to the outside when the ion exchange resin is filled; A plurality of fastening structures formed on the upper and lower frames to prevent a leaning phenomenon when filling the ion exchange resin and to maintain a constant distance between the upper and lower frames; And after fastening using a plurality of fastening structures, ion exchange resins may be filled in the upper and lower frames.

According to the above embodiment, harmful gases such as sulfur compounds, aldehydes, VOCS (volatile organic compounds), and benzopyrene generated during the ascon manufacturing process are passed through a chemical adsorption filter, thereby reducing the atmospheric emission concentration of harmful gases. there is.

In addition, acid gases such as SOX, NOX, HCl, HF, H2S, and alkaline gas ions including ammonia can be simultaneously removed, and it can be used for multiple purposes, and the filter has excellent durability and can be adsorbed and regenerated. It works.

In addition, the ion exchange cartridge filled with ion exchange resin uniformly and at a high density can be manufactured by a simple method of a continuous process, thereby reducing the manufacturing cost compared to the existing ion exchange filter manufacturing method, and free selection of substrates. , There is an increased effect of lowering the manufacturing cost by enabling easy attachment and detachment, reducing manufacturing time, and simplifying the process by converting the manufacturing method of the filter medium, which is manufactured by fixing the existing ion exchange resin, into a cartridge.

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

1 is an overall configuration diagram of a filtering system for removing harmful gases generated in the ascon manufacturing process;
2 is a detailed configuration diagram of an adsorption filter unit according to the present invention;
3 is a detailed configuration diagram of a filter cartridge according to the present invention.

The present invention may be embodied in many different forms and, therefore, is not limited to the embodiments set forth herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

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

1 is an overall configuration diagram of a filtering system for removing harmful gases generated in the asphalt concrete manufacturing process, FIG. 2 is a detailed configuration diagram of an adsorption filter unit according to the present invention, and FIG. 3 is a detailed configuration of a filter cartridge according to the present invention. It is also

Referring to the above drawing, the filtering system 100 for removing harmful gases generated during the asphalt manufacturing process according to the present invention includes sulfur compounds included in various harmful gases generated during the asphalt recycling process in an asphalt recycling facility (not shown), It is for removing aldehydes and VOC _S (volatile organic compounds), and may include a dust collecting unit 200, a cooling heat exchanger 300, an adsorption filter unit 400, and an air blowing unit 500.

The dust collecting unit 200 is for collecting dust and foreign substances included in various harmful gases generated from the asphalt concrete recycling facility (mixer, cyclone, hot silo, conveyor belt), and various harmful gases generated from the asphalt concrete recycling facility. It includes a plurality of suction ducts 210 for inhaling, and may further include a connection duct 202 connecting the plurality of suction ducts and the noxious gas inlet port 201 of the dust collecting unit 200.

The dust collecting unit 200 has a dust collecting container 210 provided with the inlet port 201 on one side, and a plurality of dust collecting filters 220 are arranged in a horizontal direction inside the dust collecting container. Can be installed in multiple stages there is.

The cooling heat exchanger 300 includes a heat exchanger housing 310 connected to the discharge port 203 provided on the upper side of the dust collecting unit 200 and a cooling pipe 320 installed inside the heat exchanger housing. can be configured.

When the high-temperature (about 150 ° C.) harmful gas passing through the dust collecting unit 200 flows into the cooling heat exchanger 300 through the upper side of the heat exchanger housing 310, the introduced high-temperature harmful gas While being in contact with the cooling pipe 320, heat exchange is performed, and cooling is performed to about 50° C. or less.

Here, the inlet 301 of the cooling heat exchanger 300 is located on the upper side of the heat exchanger housing 310 so as to be connected to the discharge port 203 of the dust collecting unit 200, while the outlet 302 is the heat exchanger It is located on the lower side of the housing 310, but is preferably positioned offset from the inlet 301. This is to increase the positional difference between the inlet 301 and the outlet 302 so that the high-temperature noxious gas can sufficiently heat exchange. This is to increase the heat exchange efficiency by staying inside the housing 310 for a long time.

The adsorption filter unit 400 is a core component of the present invention, and is for removing harmful substances included in the harmful gas passing through the dust collecting unit 200 and the cooling heat exchanger 300.

In particular, the adsorption filter unit 400 according to the present invention is a filter package 410 composed of a hexahedral cage 411 and a plurality of filter cartridges 412 installed in a zigzag direction inclined inside the cage. It may be formed by arranging three or more stages vertically and horizontally within the housing 420 .

Here, the filter cartridge 412 includes upper and lower frames 412a and 412b molded to fill the ion exchange resin in a uniform width in order to process and remove harmful substances contained in the harmful gas, and inner parts of the upper and lower frames. A non-woven fabric 412c fixedly installed on the ion exchange resin to prevent leakage to the outside when the ion exchange resin is filled, and formed on the upper and lower frames to prevent the skewing phenomenon when the ion exchange resin is filled and to maintain a constant distance between the upper and lower frames. A plurality of fastening structures 412d and after fastening using the plurality of fastening structures may have a configuration in which ion exchange resins (not shown) are filled in the upper and lower frames.

The filter cartridge 412 enhances adsorption performance by coating a safety-assured material on the specific surface area of the carrier, and in order to maximize treatment efficiency, the filter cartridge 412 is coated with a chemical adsorption material, which is a glass and glass composite material, to remove odors contained in harmful gases. and a chemical adsorption filter capable of stably removing harmful substances.

In addition, the adsorption filter unit 400 is configured to be detachable in a drawer type inside the cage 411, so that it can be periodically exchanged and washed according to the degree of contamination, so maintenance is easy.

In the embodiment of the present invention, the filter packages 411 disposed in three or more stages vertically and horizontally are installed in two or more places along the direction of movement of the harmful gas inside the filter housing 420, and the filter packages are located therebetween. A non-filtering section (z) in which is not installed may be provided.

At this time, when installed in three stages vertically and horizontally, harmful substances to be removed, such as sulfur compound removal in the first stage, aldehyde removal in the second stage, and VOC removal in the third stage, can be shared and removed. Of course, the three-stage installation is just an example, and may be installed in more or less stages. However, the same applies to the fact that the filters in each stage divide and filter the filtrate according to the type.

The non-filtering section (z) is to prevent flow resistance from increasing when the harmful gas passing through the first filtering section directly flows into the second filtering section, so that the harmful gas flows more smoothly without flow resistance play a role

The exhaust unit 500 forcibly sucks harmful gas through the dust collecting unit 200 and the cooling heat exchanger 300 and sends it to the adsorption filter unit 400 .

The above present invention reduces the atmospheric emission concentration of harmful gases by passing harmful gases such as sulfur compounds, aldehydes, VOCS (volatile organic compounds), and benzopyrene generated during the ascon manufacturing process through a chemical adsorption filter.

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

100: filtering system for removing harmful gases
200: dust collection unit
300: cooling heat exchanger
400: adsorption filter unit
500: ventilation unit

Claims (2)

By passing harmful substances including sulfur compounds, aldehydes, VOCS, and benzopyrene included in the harmful gas generated during the process of regenerating ascon in the asphalt regeneration facility through a chemical adsorption filter, the atmospheric emission concentration of harmful gases can be reduced. In the harmful gas removal filtering system that can be,
The harmful gas removal filtering system includes a dust collection unit for collecting dust and foreign substances included in high-temperature harmful gas generated during the process of regenerating asphalt concrete;
A cooling heat exchanger that cools the harmful gas filtered out of dust and foreign matter by the dust collection unit to 50° C. or less;
It consists of an adsorption filter unit that filters harmful substances contained in the harmful gas cooled in the cooling heat exchanger,
A ventilation unit for forcibly sucking the gas through the dust collecting unit and the cooling heat exchanger and sequentially discharging the harmful gas to the adsorption filter unit;
The adsorption filter unit arranges a filter package composed of a hexahedron-shaped cage and a plurality of filter cartridges inclined in a zigzag direction inside the cage in three stages vertically and horizontally in the filter housing,
Among the three stages, sulfur compounds are removed in the first stage, aldehydes are removed in the second stage, and VOCs are removed in the third stage to share and remove harmful substances,
The filter cartridge is a chemical adsorption filter filled with ion exchange resin in a uniform width in order to process and remove harmful substances contained in harmful gases,
The adsorption filter unit is configured to be detachable in a drawer type inside the cage so that it can be periodically exchanged and washed according to the degree of contamination,
The filter packages disposed up and down and left and right are installed inside the filter housing along the direction of movement of the harmful gas, and a non-filtering section in which the filter package is not installed is provided in the ascon manufacturing process, characterized in that A filtering system for removing harmful gases.
The method of claim 1,
The filter cartridge includes upper and lower frames molded to fill the ion exchange resin with a uniform width in order to process and remove harmful substances included in the harmful gas;
Non-woven fabrics fixed inside the upper and lower frames to prevent leakage to the outside when the ion exchange resin is filled;
a plurality of fastening structures formed on the upper and lower frames to prevent tipping when the ion exchange resin is filled and to maintain a constant distance between the upper and lower frames; and
A filtering system for removing harmful gases generated in the ascon manufacturing process, characterized in that the ion exchange resin is filled in the upper and lower frames using the fastening structure.

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