KR20100123536A - Absorbing tower for voltile organic compounds - Google Patents

Abstract

PURPOSE: An absorbing tower for volatile organic compounds is provided to enable one absorbing tower for volatile organic compounds to process an exhaust gas even though a volatile organic compound-contained exhaust gas is continuously generated. CONSTITUTION: A volatile organic compound absorbing tower includes a tank(10), a fluidized bed(20), and a vibrating unit(30). An absorbent input pipe(14) and an absorbent exhaust pipe(12) are installed in upper/lower parts of the tank respectively. The fluidized bed is installed in upper/lower ends of the tank. A plurality of gas passing holes(H1) is installed on the fluidized bed. Absorbent(A) loaded on the fluidized bed moves downward. The vibrating unit shakes the fluidized bed from the outside of the tank.

Description

Volatile Organic Compound Adsorption Tower {ABSORBING TOWER FOR VOLTILE ORGANIC COMPOUNDS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorption tower for adsorptive separation of various volatile organic compounds contained in exhaust gases generated in various industrial sites. More particularly, the present invention relates to a plurality of plate-shaped fluidized beds through which a plurality of gas through holes are formed. By installing in the cylindrical tank in multiple stages up and down so as to vibrate, the adsorbent moves along the fluidized bed, while adsorbing the volatile organic compounds in the exhaust gas while contacting the exhaust gas moving from the bottom to the top of the inside of the adsorption tower. The present invention relates to a volatile organic compound adsorption tower, in which an adsorbent adsorbing a volatile organic compound is discharged to the outside of the adsorption tower, and the discharged adsorbent is regenerated and then reintroduced into the adsorption tower.

In the 1990s, the necessity of total preservation of the global environment has been strongly raised, and global environmental problems such as global warming and ozone depletion have been recognized as issues at the national level. Much attention has been paid to the photochemical air pollution phenomenon and the increase of ozone concentration. Volatile organic compounds are known as the cause of photochemical smog, and halogenated volatile organic compounds including halogen element are It is known as a volatile organic compound that pollutes ground water as well as air.

In particular, research on this field is being actively conducted as the PCDDs (polychlorinated dibenzodioxins) and PCDFs (polychlorinated dibenzofurans) generated from incinerators have emerged as a social problem.

The above volatile organic compounds are contained in exhaust gases generated from solvent and detergent use processes, petrochemical product manufacturing processes, incineration processes, etc., which are mostly volatile, have high residuals, and are toxic. In the art, a technique for efficiently separating and recovering volatile organic compounds from exhaust gas has been actively studied.

Techniques for decomposing / recovering volatile organic compounds from the exhaust gas include pyrolysis, condensation, absorption, membrane separation, and adsorption. Pyrolysis using the combustion process as a decomposition technique is a device for removing volatile organic compounds. Among the simplest and low concentrations of volatile organic compounds, the exhaust gas can be treated, but if the waste heat recovery system is not provided due to combustion, the operating cost will not only increase, but also the carbon dioxide that is currently being reduced as a greenhouse gas. And a secondary pollutant in incomplete combustion.

As a recovery technique, the condensation method is difficult to remove and recover when the volatile organic compounds contained in the exhaust gas are not at a high concentration, and the volatile organic compounds recovered in the condensation process have a high water content. Silver is possible from low to high concentrations, but the quality of the recovered volatile organic compounds is poor, and not only requires a separate purification process such as condensation, but also may cause contamination by the solvent used to absorb the volatile organic compounds. There is this.

Membrane separation is also suitable for the removal and recovery of expensive high-concentration volatile organic compounds because of high equipment costs and low efficiency at low concentrations, but it is not economical for the recovery of general volatile organic compounds. It is known to be the most suitable technique for treating volatile organic compounds as a technique of removing volatile organic compounds by periodically repeating adsorption and desorption using an adsorption tower.

The adsorption method is applicable to a wide concentration range from low concentration to high concentration, and has an advantage of low installation cost and operation cost, and simple operation. The efficiency of the adsorption method varies depending on the method of recovering the adsorbed volatile organic compounds. In the Korean Patent Laid-Open Publication No. 1999-40660, "A device and a method for removing volatile organic compounds using adsorption and plasma" are published.

The invention is provided with two or more adsorption towers filled with activated carbon, and then sequentially passing the exhaust gas through the adsorption tower to adsorb volatile organic compounds to the adsorbent, and desorb and discharge the volatile organic compounds adsorbed in the adsorption tower from the adsorption tower. A device that passes through a plasma reactor provided between an adsorption tower and a vacuum pump, wherein the volatile organic compounds introduced into the plasma reactor are converted into a solid polymer form or a harmless form by a plasma polymerization process at low pressure. After the device is discharged to the outside.

The present invention not only has to provide two or more adsorption towers, but also to desorb the volatile organic compounds adsorbed on the adsorbents, since the exhaust gas does not pass through the adsorption towers, the operation efficiency of the equipment decreases, and an expensive plasma reactor is used. As a result, there is a problem that the cost of equipment investment increases.

That is, an adsorption tower is essentially provided in the adsorption method for removing volatile organic compounds contained in the exhaust gas, and the adsorption tower is filled with an adsorbent such as activated carbon. If the adsorption tower continues to operate, the adsorbent degrades and the adsorbent is regenerated or replaced. In the case of an intermittent process with a time to stop the adsorption tower and regenerate or replace the adsorbent, only one adsorption tower may be required, but in the case of a continuous process that requires continuous operation without stopping the adsorption tower. By connecting two or more adsorption towers in parallel, the amount of the adsorbent to be charged increases, not only the facility investment cost increases but also the installation place becomes large.

In addition, two conventional adsorption towers are installed in a fixed bed type, and thus, processing efficiency decreases as a channeling phenomenon and dead space of volatile organic compounds injected into the adsorption tower occur.

The present invention has been made to solve the problems of the adsorption tower provided in the conventional adsorption and desorption apparatus for separating and recovering volatile organic compounds contained in the exhaust gas of various industrial sites, volatile in It is an object of the present invention to provide an adsorption tower capable of continuously treating organic gas-containing exhaust gas.

The object of the present invention is to provide a fluidized bed and a fluidized bed in which a plurality of gas passage holes are installed in the tank so that the adsorbent can be continuously discharged from the upper part to the lower part of the adsorption column by the flow and then discharged to the outside of the adsorption tower. By vibrating means for vibrating or the like.

In the volatile organic compound adsorption tower of the present invention, the adsorbent filled in the adsorption column descends while moving radially between the inner circumferential surface and the center of the adsorption column along the fluidized bed and is discharged to the outside through the lower end of the adsorption tower, and then reintroduced to the upper part of the adsorption tower. Since the structure can be a continuous process in which the exhaust gas containing volatile organic compounds continuously generated, it is possible to treat the exhaust gas with only one adsorption tower, thereby reducing the overall equipment investment cost.

And because the structure of the adsorption tower is relatively simple, maintenance costs are reduced, and there is an advantage in that it is easy to operate.

In addition, since the adsorbent is continuously discharged, regenerated, and injected as it flows, the amount of adsorbent is significantly reduced compared to the conventional fixed bed, and since the volatile organic compound is a countercurrent method in which the adsorbent moves from the bottom to the top, There is an advantage that the processing efficiency is improved.

The present invention relates to a volatile organic compound adsorption tower for adsorbing and separating volatile organic compounds contained in exhaust gas.

The volatile organic compound adsorption tower of the present invention adsorbs the volatile organic compounds contained in the exhaust gas generated in an industrial site to a continuously moving adsorbent, and supplies new or regenerated adsorbent to the upper part of the adsorption tower, and supplies the supplied adsorbent to the adsorption tower. There is a feature of the present invention in a structure that can be continuously moved to the bottom to discharge to the outside of the adsorption tower.

As described above, the adsorption tower of the present invention has a structure in which a fluid bed having a top and bottom double plate-like structure is provided in multiple stages in a cylindrical tank. The adsorbent which moves downward from the rim and the rim to the center, i.e., radially, into the fluidized bed at the lower end by the drop adsorbs the volatile organic compounds in the exhaust gas moving upward in the tank.

That is, the adsorbent in the tank is continuously moved from the top to the bottom, the adsorbent is introduced into the upper end of the tank, the adsorbent descends while adsorbing volatile organic compounds in the tank, and the adsorbent in which the organic compound is adsorbed to the bottom of the tank. Is discharged.

Adsorption tower of the present invention as described above, the tank; A fluidized bed mounted in multiple stages inside the tank; Vibration means; It is composed of, etc. Looking at each as follows.

The tank is filled with a solid granular adsorbent such as activated carbon. The tank is provided with an exhaust gas inlet tube and an adsorbent discharge tube at one lower side and a lower center thereof, respectively, and a purge gas discharge tube and an adsorbent input are disposed at one upper side and an upper center thereof. Each tube is provided.

The fluidized bed is a multi-stage structure that is installed in multiple stages inside the tank to support the adsorbent and descends by vibration while being spaced apart from each other. Fluidized plates in the upper and lower pairs.

And the upper flow plate constituting the fluidized bed of each stage is inclined downward toward the inner peripheral surface of the tank at the center of the tank, the lower flow plate located below the upper flow plate is inclined downward toward the center of the tank at the inner peripheral surface side of the tank The diameter of the lower flow plate is larger than that of the upper flow plate.

In addition, an adsorbent dropping hole penetrates through the center of the lower flow plate in each fluidized bed. The adsorbent dropped to the center of the upper flow plate in the uppermost fluidized bed is moved from the center of the upper flow plate to the edge by the flow of the upper flow plate. Falling to the upper surface of the edge of the lower flow plate having a larger diameter than the plate.

In addition, the adsorbent dropped to the upper surface of the edge of the lower flow plate is moved to the center of the lower flow plate by the flow of the lower flow plate, and then falls to the center of the upper flow plate of the lower flow phase through the adsorbent falling hole in the center. .

Radial and falling movement of the adsorbent as described above is carried out to the lower flow plate of the lowest fluidized bed and then discharged to the outside of the adsorption tower through the adsorbent dropping hole provided in the center of the lower fluidized plate of the lowest fluidized bed and the adsorbent discharge pipe at the center of the bottom of the tank. After the adsorbent is regenerated, the adsorbent is reinserted into the adsorption tower through the adsorbent input pipe at the center of the tank top.

The vibrating means is for vibrating the fluidized bed, and by allowing the inclined fluidized bed to vibrate, the adsorbent deposited on the fluidized bed upper surface can move.

Details of the effects and the resulting effects, including the object and technical configuration of the present invention will be clearly understood by the following description with reference to the drawings showing a preferred embodiment of the present invention.

Figure 1 shows the internal structure of an embodiment of the present invention the volatile organic compound adsorption tower.

As shown, the adsorption tower of the present invention,

The exhaust gas injection pipe 11 and the adsorbent discharge pipe 12 for injecting the exhaust gas containing volatile organic compounds in the lower portion is provided, and the purification gas discharge pipe for discharging the exhaust gas from which the volatile organic compounds have been removed (13). And a tank 10 provided with an adsorbent inlet pipe 14;

A fluidized bed (20) installed in the tank (10) in up and down stages and provided with a plurality of gas through holes (H1), respectively;

Vibration means (30) installed outside the tank 10 to shake the fluidized bed (20); And the like.

At this time, the tank 10 is preferably a cylindrical having a circular cross section.

The fluidized bed 20 installed in multiple stages in the tank 10 is a means for moving the adsorbent A downwardly.

A plurality of gas passage holes H1 formed therethrough, the upper flow plate 21 having a plate shape inclined downward from the center toward the edge portion;

The larger area than the upper flow plate 21, located below the upper flow plate 21, inclined upward from the center toward the rim, a plurality of gas through holes (H1) are formed through the adsorbent falling hole in the center A lower flow plate 22 through which H2 is penetrated; And the like.

The fluidized bed 20 as described above is coupled to be vibrated in the tank 10, and the vibration means 30 outside the tank 10 is installed to shake the tank 10 to prevent vibration of the tank 10. Accordingly, the fluidized bed 20 may be vibrated together, or the fluidized bed 20 may be directly vibrated.

In addition, a plurality of connecting brackets B are provided on the outer circumferential surface of the tank 10 so that the entire fluidized bed 20 installed in multiple stages can shake organically with each other. By connecting the fluidized bed 20, the entire fluidized bed 20 can vibrate together organically when the tank 10 or the connecting bracket B is shaken.

At this time, the edges of the upper and lower flow plates 21 and 22 are connected to each other to allow the adsorbent to fall, and the connecting member C connecting the edges of the upper and lower flow plates 21 and 22 is connected to the tank 10. Bar is coupled to the connecting bracket (B) after being exposed to the outside through the wall of the bar, the flow 20 may be shaken by a method of directly connecting the vibration means to the connecting bracket (B).

When the upwardly convex upper flow plate 21 vibrates by the above structure, the adsorbent A introduced into the center of the upper flow plate 21 moves to the rim along the upper surface of the upper flow plate 21 and then the lower flow. The adsorbent dropped to the upper surface of the rim of the plate 22, and the adsorbent dropped to the upper surface of the lower convex lower flow plate 22 moves to the center along the upper surface of the lower flow plate 22, and then the lower flow plate 22 Through the adsorbent falling hole (H2) in the center portion falls to the center of the upper flow plate (21) of the lower flow phase.

And the adsorbent falling through the adsorbent falling hole (H2) of the lower flow plate 22 provided in the lowest flow bed is discharged to the outside of the tank 10 through the adsorbent discharge pipe 12 of the lower center of the tank (10).

However, the plate-shaped upper and lower flow plates 21 and 22 are inclined in opposite directions, and may change in inclination due to continuous vibration, and thus, between the centers of the upper and lower flow plates 21 and 22. In order to keep the interval constant, as shown in FIGS. 2 and 3, the adsorbent dropping tube 23 can be fixedly coupled to the adsorbent dropping hole H2 at the center of the lower flow plate 22.

At this time, the upper end of the adsorbent dropping pipe 23 is fixedly coupled to the center of the bottom surface of the upper convex upper flow plate 21, and the lower end of the adsorbent dropping pipe 23 is different from the bottom of the lower convex lower flow plate 22. It is located between the upper surface of the lower upper flow plate (21).

That is, the center of the lower convex lower flow plate 22 is coupled to the outer circumferential surface of the adsorbent drop tube 23, so that the lower end of the adsorbent drop tube 23 passes through the lower flow plate 22 and the bottom surface of the lower flow plate 22. Although positioned below, the lower end of the adsorbent dropping pipe 23 may be coupled to the center of the lower flow plate 22 so that the lower end of the adsorbent dropping pipe 23 is not positioned below the bottom of the lower flow plate 22. have.

In addition, the upper end of the adsorbent dropping pipe 23 may be in a simple contact or somewhat spaced state without being fixed to the bottom of the upper flow plate (21).

And the adsorbent through hole (H3) is provided in the pipe wall of the adsorbent dropping pipe 23 in contact with the upper surface of the lower flow plate 22, the adsorbent (A) moved from the edge portion to the center along the upper surface of the lower flow plate (22) is The adsorbent drops down through the adsorbent through hole (H3) and the hollow (H4) of the dropping pipe (23).

In addition, the adsorbent drop tube 23 may be coupled only to the lowermost fluidized bed to be connected to the adsorbent discharge tube 12 for smooth discharge of the adsorbent.

However, the double-plate fluidized bed 20 may have a single plate structure, and as shown in FIG. 4, each of the fluidized beds 20 may include any one of the upper and lower fluidized plates 21 and 22. It can be comprised by the one flow plate 24 which has the same structure as one, and this fluid plate 24 can be provided in multiple stages up and down.

At this time, the top flow plate is inclined downward from the center to the rim side, and from the bottom end to the inclined direction alternately, but the bottom flow plate is adjusted to the incline upward from the center to the rim side.

In addition, the adsorbent dropping hole (H2) is provided in the fluidized plate of the stage just below the uppermost flow plate, and thereafter, the adsorbent dropping hole (H2) is provided in the center of the fluidized plate every other stage. (H2) is provided.

In other words, the uppermost fluidized plate has an upwardly convex shape, and from the lower end thereof, the downwardly convex fluidized plate and the upwardly convex fluidized plate are alternately formed, and an adsorbent dropping hole (H2) is provided at the center of the downwardly convex fluidized plate. Increase the size of the convex flow plate than the plate.

Of course, all the flow plate 24 has a gas passage hole (H1), the connection member (C) and the connection bracket (B) may also be coupled to the flow plate (24).

However, when the bottom surface of the tank 10 is inclined downward from the rim toward the center, the inclined surface of the lowermost flow plate is inclined downward without inclining upward from the center to the rim side, so that the adsorbent of the bottom fluid plate is moved to the tank ( 10) After the drop to the edge portion of the tank 10, the adsorbent may be moved from the bottom edge portion of the tank 10, in this case, the lowermost flow plate is not provided with the adsorbent falling hole.

The adsorption tower of the present invention configured as described above is operated as a constituent device of the volatile organic compound adsorption and desorption apparatus. As an example of the volatile organic compound adsorption and desorption apparatus, the operation state of the adsorption tower of the present invention is as follows.

As shown in FIG. 5, the adsorbent discharged to the adsorbent discharge pipe 12 is passed through the desorption reactor 300 which separates the volatile organic compound from the adsorbent by the adsorbent transporter 200 and then re-enters the adsorption tower 100. do.

At this time, rather than directly inputting the adsorbent to the adsorption tower 100, a separate storage container 400 is provided on the adsorption tower 100 to store the adsorbent first in the storage container 400 and then in the storage container 400 It is more preferable in terms of the input management of the adsorbent so that the adsorbent is introduced into the adsorption tower 100 according to the operating state.

Reference numeral "500" denotes a "purified gas discharge device" which is connected to the purification gas discharge pipe 13 of the adsorption tower 100, sucks the purification gas moved to the upper part of the absorption tower 100, and discharges it to the outside of the absorption tower 100. And "600" is a "condenser" connected to the desorption reactor 300 to recover and liquefy gaseous volatile organic compounds desorbed from the adsorbent.

1 is a structural diagram of the adsorption tower of the first embodiment of the present invention.

Figure 2 is a structural diagram of the adsorption tower of the second embodiment of the present invention.

Figure 3 is a perspective view of the combination of the lower flow plate and the adsorbent drop pipe of the second embodiment of the present invention.

Figure 4 is a perspective view of the combination of the lower flow plate and the adsorbent drop pipe of the third embodiment of the present invention.

Figure 5 is a block diagram of an embodiment volatile organic compound adsorption and desorption apparatus including the adsorption tower of the present invention.

Explanation of symbols on the main parts of the drawings

 10. Tank 11.Exhaust gas injection pipe 12.Adsorbent discharge pipe

 13. Purification gas discharge pipe 14. Adsorbent input pipe 20. Fluidized bed

 21. Upper flow plate 22. Lower flow plate 23. Adsorbent dropping pipe

 24. Flow plate 30. Vibration means 100. Adsorption tower

 200. Adsorbent feeder 300. Desorption reactor 400. Storage container

 500. Purifying gas discharge system 600. Condenser A. Adsorbent

 B. Connecting bracket C. Connecting member H1. Gas passing hole

 H2. Adsorbent Droplet H3. Absorbent through hole H4. Hollow

Claims (6)

In the adsorption column for adsorptive separation of volatile organic compounds contained in the exhaust gas, A tank 10 having upper and lower adsorbent input pipes 14 and adsorbent discharge pipes 12, respectively; A fluidized bed (20) installed in the tank (10) in up and down stages and provided with a plurality of gas passing holes (H1) for moving downwardly the adsorbent (A) deposited on the upper surface; Volatile organic compound adsorption tower, characterized in that it comprises a; vibration means (30) installed outside the tank 10 to shake the fluidized bed (20). The fluidized bed of claim 1, wherein A plurality of gas passage holes H1 formed therethrough, and an upper flow plate 21 inclined downward from the center toward the edge portion; Located below the upper flow plate 21, larger than the upper flow plate 21, inclined upward toward the rim at the center, and provided with a plurality of gas through holes (H1), the adsorbent falling hole (H2) in the center The volatile organic compound adsorption tower, characterized in that comprising a; The adsorbent dropping tube (23) is coupled to the adsorbent dropping hole (H2) at the center of the lower flow plate (22), A volatile organic compound adsorption tower is characterized in that the adsorbent through hole (H3) is provided in the pipe wall of the adsorbent dropping pipe (23) in contact with the upper surface of the lower flow plate (22). The volatile organic compound adsorption tower according to claim 3, wherein the adsorbent drop pipe (23) coupled to the lower flow plate of the lowermost fluid bed of the fluidized bed (20) is connected to the adsorbent discharge pipe (12) of the tank (10). . The upper flow plate 21 and the lower flow plate 22 of the fluidized bed 20, the edge portion is connected to each other by a connecting member (C), The connection member (C) penetrates the tank (10), the volatile organic compound adsorption tower, characterized in that coupled to the connection bracket (B) outside the tank (10). The fluidized bed (20) of claim 1, wherein the fluidized bed (20) is a fluidized plate (24) having a plurality of gas through holes (H1), The flow plate 24 forms an upper and lower stages The top fluid plate is inclined downward from the center to the edge, The inclined direction of the upper and lower adjacent flow plates is opposite, Adsorbent dropping hole (H2) is provided in the center of the flow plate just below the top flow plate, The adsorbent falling hole (H2) is a volatile organic compound adsorption tower, characterized in that provided by every step.

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