WO2019017533A1 - System for removing vocs using gas distribution plate - Google Patents

Abstract

Provided is a system for removing VOCs using a gas distribution plate, comprising: a cylindrical adsorption reactor, in a fixed state, including an adsorption region in which VOCs are adsorbed and a recycling region in which the VOCs adsorbed in the adsorption region are desorbed; a plurality of microwave modules disposed at regular intervals along the periphery of the cylindrical adsorption reactor; a rotatable upper gas distribution plate which has a supply pipe for supplying recycled air to the recycling region, and which is disposed above the cylindrical adsorption reactor; and a rotatable lower gas distribution plate disposed below the cylindrical adsorption reactor and having a discharge pipe for discharging the recycled air containing the VOCs desorbed from the recycling region, wherein the recycled air is supplied to the recycling region while the supply pipe and the discharge pipe are located at the upper and lower portions of the recycling area during the rotation of the upper gas distribution plate and the lower gas distribution plate, and at the same time, microwave modules disposed on a side of the recycling region are switched on so as to heat the recycling region.

Description

VOCS removal system using gas distribution plate

The present invention relates to a VOCs removal system using a gas distribution plate. More particularly, the present invention relates to a system for removing VOCs using a gas distribution plate that maximizes microwave efficiency and effectively treats a large amount of VOCs gas by simultaneously using a rotatable gas distribution plate and a microwave module during desorption of adsorbed VOCs will be.

Volatile organic compounds (VOCs) are highly volatile organic compounds (VOCs) that are easily evaporated in the air and coexist with nitrogen oxides to generate photochemical reactions that generate ozone and photochemical oxidants, leading to photochemical smog. Due to these problems, strict domestic and foreign regulations are currently being implemented and remain a national priority to be urgently addressed.

On the other hand, since the shipyard's paint factory was an exception in the regulation of volatile organic compounds (VOCs) emission, it has met legal regulations on VOCs removal facilities as a way to enlarge factories. However, as environmental regulations are strengthened, effective VOCs removal facilities are required have. Regenerative thermal oxidizer (RTO), which is a conventional regenerative combustion system, has a problem that operation cost is increased by burning air not made with high concentration and installation space is insufficient due to large sized equipment.

Techniques using microwaves have also been developed to reduce operating costs and installation space in removing VOCs.

Patent Literature 1 relates to a VOCs degassing system, and proposes a method of directly injecting a microwave into a honeycomb-type VOCs adsorption rotor so as to regenerate an adsorption rotor. In this case, it is difficult to block the microwave leakage and the microwave efficiency is lowered, the operation stability is worried, and there is a limitation in the capacity that can be processed by one adsorption rotor, which makes it difficult to utilize in a large workplace such as a shipyard painting factory . Further, there is a problem that the operating cost is continuously increased due to continuous driving of the adsorption rotor, and the regeneration air is partially dispersed before reaching the regeneration area.

Therefore, it is necessary to develop a VOC removal system that can maximize energy efficiency while reducing the burden on the separate microwave shielding facility.

One aspect of the present invention is to propose a VOCs removal system that can maximize microwave efficiency, simplify facilities, reduce operating costs, and effectively treat large amounts of VOCs gas.

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

In order to achieve the above object, an aspect of the present invention is to provide a cylindrical adsorption reactor in a fixed state including an adsorption region in which VOCs are adsorbed and a regeneration region in which adsorbed VOCs are desorbed in the adsorption region; A plurality of microwave modules disposed at regular intervals along the circumference of the cylindrical adsorption reactor; A rotatable upper gas distribution plate having a supply pipe for supplying regeneration air to the regeneration zone and disposed above the cylindrical adsorption reactor; And a rotatable lower gas distribution plate disposed below the cylindrical adsorption reactor and having a discharge tube for discharging reclaimed air containing VOCs desorbed from the regeneration zone, wherein the upper gas distribution plate and the lower gas distribution plate The regeneration air is supplied to the regeneration area while the supply tube and the discharge tube are located at the upper and lower parts of the regeneration area while the plate is rotating, and at the same time, the microwave module arranged on the side of the regeneration area is switched to the regeneration area, Wherein the VOCs are removed from the gas distribution plate.

According to the present invention, it is possible to simplify the equipment and to reduce the operation cost by providing the gas distribution plate having a relatively light weight in comparison with the adsorption reactor and the microwave module, and it is easy to control the adsorption and desorption time, It is possible to provide a system for removing VOCs that can effectively treat a large amount of VOCs gas because it is possible to carry out an adsorption and desorption process in the absorption process, thereby saving energy and facility space, maximizing the microwave efficiency and improving the regeneration efficiency.

FIG. 1 is a partial cross-sectional view of a system for removing VOCs according to an embodiment of the present invention, in which the outer periphery of a cylindrical adsorption reactor is arranged to surround a microwave module.

2 is a conceptual diagram of an upper and a lower gas distribution plate installed in a case where one regeneration region of the VOCs removal system according to an embodiment of the present invention is one.

3 is a conceptual diagram of an upper and a lower gas distribution plate installed in a case where there are two regeneration zones of a VOCs removal system according to an embodiment of the present invention.

FIG. 4 is a conceptual diagram illustrating a structure in which the upper and lower gas distribution plates are provided in a cylindrical adsorption reactor in the case where one regeneration region of the VOCs removal system according to an embodiment of the present invention is used.

FIG. 5 is a conceptual diagram of a configuration in which upper and lower gas distribution plates are provided in a cylindrical adsorption reactor in the case where there are two regeneration zones of a VOCs removal system according to an embodiment of the present invention.

6 is a cross-sectional view of a VOCs removal system in accordance with an embodiment of the present invention.

FIG. 7 is a conceptual diagram of a configuration in which a system for removing VOCs and peripheral equipment according to an embodiment of the present invention are integrated.

FIG. 8 is a view of a microwave module having a slotted waveguide installed in a divided region of a cylindrical reactor according to an embodiment of the present invention. Referring to FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a system for removing VOCs according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a VOCs removal system, comprising: a fixed-bed cylindrical adsorption reactor (110); A plurality of microwave modules 120 disposed at regular intervals along the circumference of the cylindrical adsorption reactor 110; And rotatable gas distribution plates 130a, 130a ', 130b, and 130b' disposed above and below the cylindrical adsorption reactor 110, respectively.

In order to simplify the equipment and reduce the operating cost by providing a relatively lightweight gas distribution plate in a rotary manner as compared with the adsorption reactor and the microwave module.

The cylindrical adsorption reactor 110 is filled with an adsorbent 111 such as activated carbon or zeolite to adsorb the VOCs in the gas. In addition, the inside of the cylindrical adsorption reactor 110 is filled with the adsorbent 111, and the region is radially divided with respect to the central axis. The divided region includes an adsorption region in which VOCs in the VOC-containing gas supplied from the outside are adsorbed, And a regeneration zone for desorbing the VOCs adsorbed in the adsorption zone through the high temperature regeneration air. In addition, it may further comprise a cooling region in which cooling is selectively performed after the VOCs are desorbed.

The plurality of microwave modules 120 are arranged at regular intervals along the circumference of the cylindrical adsorption reactor 110. Preferably, the microwave module 120 may be disposed on each side of the radially divided region of the cylindrical adsorption reactor 110.

The plurality of microwave modules 120 may be formed in the form of wrapping a side surface of the cylindrical adsorption reactor 110 or a part of a case 140 surrounding the side of the cylindrical adsorption reactor 110 have. Thus, the microwave module 120 or the case 140 including the microwave module 120 can prevent the microwave from leaking from the side of the cylindrical adsorption reactor 110. The microwave module 120 turns on the power when the arranged area is reproduced, heats the microwave to irradiate the reproducing area, and when the reproduction is completed, the power is turned off and the operation is stopped. The side surface of the cylindrical adsorption reactor 110 may be composed of a mica plate 112 so that microwaves can pass therethrough.

The microwave module may employ a method of irradiating a microwave to a reproducing region through a waveguide. At this time, a state in which the waveguide is not divided, that is, a passage through which the microwave is irradiated can be made as one.

Alternatively, the microwave module 120 'may include a plurality of slotted waveguides 170 to uniformly divide a passage through which the microwaves pass, thereby irradiating the regeneration area relatively uniformly. That is, each of the plurality of microwave modules has a waveguide 170 including a plurality of slots along a side periphery of the radially divided region 110 of the cylindrical adsorption reactor, May be uniformly irradiated.

FIG. 8 shows a microwave module 120 'having a slot waveguide 170 installed around a divided one side region of the cylindrical reactor 110. 8, the microwave may be irradiated at one side of the waveguide, or the microwave may be irradiated at the center of the waveguide.

The rotatable gas distribution plate is arranged on the upper and lower portions of the cylindrical adsorption reactor 110, respectively. The upper gas distribution plates 130a and 130a 'disposed on the upper portion of the cylindrical adsorption reactor 110 are provided with supply pipes 133a and 133a' for supplying regeneration air to the regeneration region of the cylindrical adsorption reactor 110 . The regeneration air is supplied to the supply pipes 133a and 133a 'through the regeneration air inlets 132a and 132a'. The lower gas distribution plates 130b and 130b 'disposed at the lower portion of the cylindrical adsorption reactor 110 are connected to a discharge tube 133b for discharging the regeneration air containing VOCs desorbed from the regeneration region of the cylindrical adsorption reactor 110 And 133b '. The regeneration air outlets 132b and 132b 'may be connected to the discharge tubes 133b and 133b'. The supply pipes 133a and 133a 'of the upper gas distribution plates 130a and 130a' and the discharge pipes 133b and 133b 'of the lower gas distribution plates 130b and 130b' Is located in the projected portion of the regeneration region of the cylindrical adsorption reactor 110 just above or below the regeneration zone. For the sake of convenience, the regions where the regeneration region of the cylindrical adsorption reactor 110 is projected onto the upper gas distribution plates 130a and 130a 'are referred to as upper regeneration regions 131a and 131a', and the lower gas distribution plates 130b and 130b ' Is referred to as a lower reproduction area 131b or 131b '.

The upper gas distribution plates 130a and 130a 'and the lower gas distribution plates 130b and 130b' have the same rotation period at the upper and lower portions of the cylindrical adsorption reactor 110 and are configured to periodically rotate in the same direction do.

The upper and lower gas distribution plates 130a and 130a 'and the lower gas distribution plates 130b and 130b are rotated so that the upper and lower regeneration zones 131a and 131b and the lower regeneration zone 131b and 131b' While the supply pipes 133a and 133a 'and the discharge pipes 133b and 133b' are located on the upper and lower sides of the regeneration area of the reactor 110, The regeneration air is supplied to the upper part of the regeneration zone of the cylindrical adsorption reactor 110 through the adsorption units 133a and 133a '. At the same time, the microwave module 120 disposed on the side of the regeneration area is switched from the operation stop state to the operating state to heat the regeneration area. As a result, the adsorbed VOCs components are desorbed. The regeneration air containing the desorbed VOCs is discharged through the discharge pipes 133b and 133b 'disposed at the lower part of the regeneration area.

The rotation period and the playback time can be adjusted by presetting them through a timer or a program. That is, the rotation period of the upper and lower gas distribution plates 130a, 130a ', 130b, and 130b', the rotation stop time during reproduction, and the operation time of the microwave module 120 can be preset through a timer or a program have. This makes it easy to control the adsorption and desorption time.

Or sensor to detect that the upper regeneration zone 131a or 131a 'and the lower regeneration zone 131b or 131b' are located on a vertical line to the regeneration zone of the cylindrical adsorption reactor 110, It is possible to stop the rotation of the plates 130a, 130a ', 130b, and 130b', to simultaneously inject the regeneration air and operate the microwave module 120.

The area to be reproduced at the same time may be one divided reproduction area or a plurality of reproduction areas radially arranged at regular intervals. FIGS. 2 and 4 show a case in which there is one regeneration zone, and FIGS. 3 and 5 show a conceptual diagram in which upper and lower gas distribution plates are combined with a cylindrical reactor when there are two regeneration zones.

The supply pipes 133a and 133a 'of the upper gas distribution plates 130a and 130a' and the lower gas distribution plates 130b and 130b 'of the upper gas distribution plates 130a and 130a' The number of the discharge pipes 133b and 133b 'in the radial direction may be one or plural radially arranged at regular intervals. At this time, the plurality of supply pipes 133a and 133a 'and the discharge pipes 133b and 133b' are radially arranged at regular intervals about the rotation axis of the upper and lower gas distribution plates 130a, 130a ', 130b and 130b' do.

Like the regeneration zone, the adsorption zone can also consist of several zones at the same time. In this way, the adsorption and desorption process can be carried out in various areas at the same time, thus saving energy and facility space.

6, the VOCs removal system of the present invention includes an additional case (not shown) surrounding the upper gas distribution plate 130a, 130a 'and the lower gas distribution plate 130b, 130b' and the microwave module 120 150, and may further include a compressed air inlet 160 provided in the additional case 150. The degree of contact between the upper gas distribution plates 130a and 130a 'and the lower gas distribution plates 130b and 130b' and the cylindrical adsorption reactor 110 is increased by injecting or discharging compressed air through the compressed air inlet 160 Can be adjusted.

That is, while the regeneration air is supplied to the regeneration zone and the microwave module 120 is maintained in an operating state, the upper gas distribution plates 130a and 130a 'and the lower gas distribution plates 130b and 130b' The upper gas distribution plates 130a and 130a 'and the lower gas distribution plates 130b and 130b are in close contact with the adsorption reactor 110. When the supply of the regeneration air is stopped and the microwave module 120 stops operating, 130b 'may be configured to be away from the cylindrical adsorption reactor 110. [ By thus injecting and removing the compressed air, the degree of contact between the upper and lower gas distribution plates 130b and 130b 'and the cylindrical adsorption reactor 110 can be adjusted. The regeneration air supplied through the above structure is prevented from being dispersed to the adjacent adsorption region or the cooling region, so that the supplied regeneration air can be fully utilized in the regeneration operation.

Sectional area of the upper gas distribution plates 130a and 130a 'and the lower gas distribution plates 130b and 130b' may be set to be equal to the cross-sectional area of the cylindrical adsorption reactor 110 in order to enhance the effect.

FIG. 7 is a conceptual diagram of a configuration in which a cylindrical adsorption reactor 110 of the present invention, a catalyst system, and a heat exchanger are integrated.

VOC-containing gas is supplied to the adsorption region from the outside, and VOCs in the VOC-containing gas are adsorbed. Fresh air with adsorbed VOCs is discharged to the outside air.

The regeneration air containing VOCs discharged from the regeneration zone is oxidatively decomposed into carbon dioxide and water by the VOCs desorbed in the regeneration zone through the catalytic reactor. That is, in the catalytic reactor, VOCs are oxidized to carbon dioxide (CO ₂ ) and water (H ₂ O) under a warming condition of about 200 to 350 ° C., and a Pd catalyst, a Pt catalyst, a Ru catalyst, Can be used.

The catalytic reactor of the present invention may further include a separate microwave module to utilize it as a heat source. The hot gas containing VOCs desorbed into the reactor body flows into the reactor body, absorbs microwaves, and is used as a heat source to accelerate the decomposition of VOCs to be removed and treated.

The hot air containing CO ₂ / H ₂ O that has passed through the catalytic reactor can be recycled as energy for the desorption reaction of the regeneration zone, and the waste heat is heat-exchanged in the heat exchanger and supplied to the regeneration air.

In the case where the adsorption reactor of the present invention has a cooling zone, the VOCs are desorbed from the cooling zone, and the adsorption reactor having a surface temperature increased by microwaves is cooled. At this time, cooling air is supplied to the cooling zone, . The injected cooling air is converted into hot air of about 50 to 100 DEG C while passing through the cooling region, and the hot air passing through the cooling region, similar to the hot air containing CO ₂ / H ₂ O passing through the catalytic reactor, The waste heat can also be heat-exchanged in the heat exchanger and supplied to the regeneration air to be recycled as energy for the desorption reaction of the regeneration zone.

On the other hand, the cooled air and CO ₂ / H ₂ O pass through the heat exchanger and are discharged to the outside air.

As described above, in the present invention, the adsorption reactor and the microwave module, which occupy a large volume and weight in the VOCs removal system, are fixed and a relatively lightweight gas distribution plate is provided in a rotary manner, And the adsorption and desorption time can be easily controlled. At the same time, the adsorption and desorption process can be performed in various regions, and the effect of several adsorption reactors can be seen with one adsorption reactor. Further, microwave leakage can be prevented on the side of the adsorption reactor since the structured microwave module is attached and fixed to the adsorption reactor, and furthermore, while the microwave is irradiated on the upper and lower gas distribution plates 130b and 130b ' It is possible to maximize the microwave efficiency by blocking the microwave leakage even in the upper region below the adsorption reactor and to prevent the regeneration gas from being dispersed in the adjacent adsorption region or the cooling region, thereby improving the regeneration efficiency.

Claims (10)

1. A cylindrical adsorption reactor in a fixed state including an adsorption region in which VOCs are adsorbed and a regeneration region in which adsorbed VOCs are desorbed from the adsorption region;

   A plurality of microwave modules disposed at regular intervals along the circumference of the cylindrical adsorption reactor;

   A rotatable upper gas distribution plate having a supply pipe for supplying regeneration air to the regeneration zone and disposed above the cylindrical adsorption reactor; And

   A rotatable lower gas distribution plate having a discharge tube for discharging recycled air containing VOCs desorbed from the regeneration zone and disposed below the cylindrical adsorption reactor;

   / RTI >

   The regeneration air is supplied to the regeneration area while the upper gas distribution plate and the lower gas distribution plate rotate and the supply pipe and the discharge pipe are located at the upper and lower parts of the regeneration area, Wherein the regeneration zone is switched to the operating state to heat the regeneration zone.
2. The method according to claim 1,

   Wherein the cylindrical adsorption reactor and the upper gas distribution plate and the lower gas distribution plate coincide in cross sectional area.
3. The method according to claim 1,

   Wherein the upper gas distribution plate and the lower gas distribution plate periodically rotate in the same direction and have the same rotation period.
4. The method according to claim 1,

   The upper gas distribution plate and the lower gas distribution plate are in close contact with the cylindrical adsorption reactor while the regeneration air is supplied to the regeneration zone and the microwave module is maintained in an operating state;

   Wherein the upper gas distribution plate and the lower gas distribution plate are configured to move away from the cylindrical adsorption reactor when the regeneration air supply to the regeneration zone is stopped and the microwave module stops operating.
5. The method according to claim 1,

   Wherein the plurality of microwave modules are included as part of a casing surrounding the side of the cylindrical adsorption reactor.
6. The method according to claim 1,

   An upper gas distribution plate and a lower gas distribution plate, and an additional case surrounding the microwave module; And

   Further comprising a compressed air inlet provided in said additional case,

   Wherein the degree of contact between the upper gas distribution plate and the lower gas distribution plate and the cylindrical adsorption reactor is controlled by injecting or discharging compressed air through the compressed air inlet.
7. The method according to claim 1,

   Wherein a plurality of supply pipes and discharge pipes are radially arranged at regular intervals around the rotation axis of the upper and lower gas distribution plates to realize a plurality of regeneration areas in the cylindrical adsorption reactor, system.
8. The method according to claim 1,

   Further comprising a catalytic reactor for oxidizing the VOCs desorbed in the regeneration zone.
9. 9. The method of claim 8,

   Further comprising a heat exchanger for heat-exchanging waste heat generated in the catalytic reactor and supplying the heat to the regeneration air.
10. The method according to claim 1,

    Wherein each of the plurality of microwave modules includes a waveguide including a plurality of slots along a circumference of the cylindrical adsorption reactor, wherein the microwave is uniformly irradiated through the plurality of slots, removing the VOCs using the gas distribution plate system.

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