JP2009291685A - Device and method for recovering volatile organic compound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To optimize both an adsorption treatment of a volatile organic compound using an adsorbent and a desorption treatment of this compound from the desorbent. <P>SOLUTION: A VOC recovery device A adsorbs VOC contained in a VOC-containing gas, using the adsorbent 4b and desorbs the VOC adsorbed by the adsorbent 4b using a desorbing gas and recovers the VOC. In addition, the VOC recovery device A comprises an adsorption chamber 1 through which the VOC-containing gas passes, a freely breathing adsorbent pack 4 which is arranged in the adosrption chamber 1 and filled with the adsorbent 4b, a desorption chamber 5 which is arranged separately from the adsorption chamber 1 and desorbs the VOC from the adsorbent 4b of the adsorbent pack 4, using the desorbing gas, and an adsorbent transfer device 6 which transfers the adsorbent pack 4 between the adosrption chamber 1 and the desorption chamber 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a volatile organic compound recovery apparatus and method.

In Patent Document 1 below, a plurality of adsorption towers each having a predetermined capacity filled with an adsorbent are provided in parallel, and at least two adsorption towers are regenerated (desorption process of VOC (volatile organic compound) from the adsorbent). On the other hand, a technique for continuously recovering VOC from a gas to be treated containing a volatile organic compound by performing an adsorption process on the remaining adsorption towers and sequentially switching these processes is disclosed. In the adsorption process, the gas to be treated is supplied to the adsorption tower to be adsorbed by the adsorbent. On the other hand, in the regeneration process, a predetermined regeneration gas is supplied to the adsorption tower and heated to volatilize the adsorbent. Desorb and recover organic compounds. In such a VOC continuous recovery technique, the gas to be treated and the regeneration gas pass through the same cross section of the adsorbent in the adsorption tower.
Patent Documents 2 and 3 listed below also include a technique for recovering a volatile organic compound using an adsorbent packed in a predetermined capacity of an adsorption tower.
JP 2007-050379 A Japanese Patent Laid-Open No. 2007-069156 JP 08-281044 A

  By the way, in the said prior art, the magnitude | size (cross-sectional area) of the adsorption agent through which process target gas passes is determined based on the flow volume of process target gas in an adsorption | suction process. That is, in order to increase the processing amount of the processing target gas per unit time, it is necessary to increase the cross-sectional area of the adsorbent, that is, the cross-sectional area of the adsorption tower. On the other hand, since the VOC adsorption rate and the desorption rate in the adsorbent are different, a flow rate of the desorption regeneration gas that is smaller than the flow rate of the processing target gas is sufficient.

However, when the regeneration gas with the minimum necessary flow rate is supplied to the adsorption tower, the regeneration gas passes through the same cross section as the gas to be treated, so that a sufficient flow rate cannot be obtained and desorption becomes insufficient or adsorption occurs. There is a problem that the desorption rate varies depending on the site of the agent. On the contrary, if the flow rate of the regeneration gas is the same as the flow rate of the gas to be processed, it is necessary to prepare more regeneration gas than necessary, which causes a problem of reducing energy efficiency in the VOC recovery process. .
Further, at the time of desorption, it is necessary to heat the adsorbent to a predetermined temperature with the regeneration gas, but there is also a problem that heating takes time because the heat capacity in the adsorption tower is relatively large.

  That is, the conventional VOC continuous recovery technique has a problem that the adsorption process of VOC by the adsorbent and the desorption process of VOC from the adsorbent cannot be optimized, respectively, and the processing efficiency is poor. Such a problem is a technical problem to be solved immediately in practical use of the VOC continuous recovery technology.

The present invention has been made in view of the above-described circumstances, and has the following objects.
(1) The adsorption process of the volatile organic compound to the adsorbent and the desorption process of the volatile organic compound from the adsorbent are optimized respectively.
(2) Improving the processing efficiency in terms of time and / or energy.

  In order to achieve the above object, in the present invention, as a first solving means related to a volatile organic compound recovery apparatus, a volatile organic compound contained in a gas to be treated is adsorbed to a predetermined adsorbent, and the adsorbent In the volatile organic compound recovery device that desorbs and recovers the adsorbed volatile organic compound using a predetermined desorption gas, the adsorbent is filled inside, and the gas to be processed passes through the first cross section of the adsorbent. A means is adopted in which a desorption gas is provided with a treatment chamber that passes through a second cross section that is smaller than the first cross section.

  As a second means for solving the volatile organic compound recovery apparatus, the volatile organic compound contained in the gas to be treated is adsorbed on a predetermined adsorbent, and the volatile organic compound adsorbed on the adsorbent is supplied with a predetermined desorption gas. In a volatile organic compound recovery device that is desorbed and recovered using, an adsorption chamber through which a gas to be treated passes, an adsorbent filler that is disposed in the adsorption chamber and is filled with an adsorbent, and an adsorption chamber; A desorption chamber that is separately disposed and desorbs a volatile organic compound from the adsorbent of the adsorbent filler using a desorption gas, and an adsorbent transfer device that transfers the adsorbent filler between the adsorption chamber and the desorption chamber; The means of comprising is adopted.

  As a third solving means related to the volatile organic compound recovery device, in the second solving means, the adsorbent is divided and stored, and includes a plurality of adsorbent fillers arranged adjacent to each other. A means is adopted in which the adsorbent filler adsorbing the volatile organic compound is sequentially moved from the adsorption chamber to the desorption chamber.

  As a fourth solution means related to the volatile organic compound recovery device, in the third solution means described above, the adsorbent transfer device further includes an adsorbent circulation means for circulating the adsorbent filler in a fixed direction in the adsorption chamber. The adsorbent filler that has moved to a specific position is moved to the desorption chamber.

  As a fifth solving means relating to the volatile organic compound recovery device, in the second solving means, in place of the adsorbent transferring device, the desorbing chamber is transferred into the adsorbing chamber and accommodates the adsorbent filling body. A means of providing a device is adopted.

  As a sixth solving means related to the volatile organic compound recovery device, in the fifth solving means, a plurality of adsorbent fillers that are separately housed and that adsorbents are separately stored, and a desorption chamber are provided as adsorbent fillers. It is further provided with a desorption chamber circulating means for circulating in a certain direction along the arrangement direction of the above, and the adsorbent fillers at positions corresponding to the circulating position of the desorption chamber are sequentially accommodated by the desorption chamber transfer device and the desorption chamber circulating means. Adopt means.

  As a seventh solving means relating to the volatile organic compound recovery device, in the above-described second to sixth solving means, a means is adopted in which the desorption chamber has a volume for accommodating one adsorbent filler. .

  As an eighth solving means relating to the volatile organic compound recovery device, in the second to seventh solving means, a means is adopted in which the adsorption chamber is a part of a flow path through which the gas to be treated passes. To do.

  Further, in the present invention, as a first solving means relating to the volatile organic compound recovery method, the volatile organic compound contained in the gas to be treated is adsorbed on a predetermined adsorbent, and the volatile organic compound adsorbed on the adsorbent is obtained. In the volatile organic compound recovery method, in which the gas to be treated passes through the first cross section of the adsorbent and the desorption gas is smaller than the first cross section. Adopt the means of passing.

  As a second means for solving the volatile organic compound recovery method, the volatile organic compound contained in the gas to be treated is adsorbed to a predetermined adsorbent, and the volatile organic compound adsorbed on the adsorbent is adsorbed to a predetermined desorption gas. In the volatile organic compound recovery method, which is desorbed and recovered by using, the desorption chamber provided separately from the adsorption chamber by adsorbing the volatile organic compound to the adsorbent in a predetermined adsorption chamber and moving the adsorbent The method of desorbing volatile organic compounds from the adsorbent is employed.

  As a third solution for the volatile organic compound recovery method, in the second solution, the adsorbent is divided and filled into a plurality of ventilated adsorbent containers and stored in the adsorption chamber. A means is adopted in which the adsorbent container filled with the adsorbed adsorbent is sequentially moved from the adsorption chamber to the desorption chamber for desorption treatment.

  As a fourth solving means related to the volatile organic compound recovery method, in the third solving means, the adsorbent container is circulated in a certain direction in the adsorption chamber, and the adsorbent container moved to a specific position is set in the desorption chamber. A means of moving and desorbing is adopted.

  As a fifth solution means related to the volatile organic compound recovery method, in the second solution means, instead of transferring the adsorbent, the desorption chamber is transferred into the adsorption chamber to accommodate the adsorbent filler. Adopt the means.

  As a sixth solution relating to the volatile organic compound recovery method, in the fifth solution, the adsorbent is divided and filled into a plurality of adsorbent containers that can be ventilated and arranged adjacent to each other in the adsorption chamber to adsorb the desorption chamber. A means is adopted in which the adsorbent filler is moved in a fixed direction along the arrangement direction of the adsorbent containers, and the adsorbent filler at a position corresponding to the circulating position of the desorption chamber is sequentially accommodated in the desorption chamber and desorbed.

  As a seventh solving means relating to the volatile organic compound recovery method, a means is adopted in which the desorption chamber has a capacity for accommodating one adsorbent container in any one of the second to sixth solving means.

  As an eighth solving means related to the volatile organic compound recovery method, in the second to seventh solving means, a means is adopted in which the adsorption chamber is a part of a flow path through which the gas to be treated passes. To do.

  According to the present invention, in the adsorbent, the processing gas passage cross section and the desorption gas passage cross section are set to different cross sections, for example, the desorption gas passage cross section is set to a smaller cross section than the processing target gas passage cross section. Therefore, it is possible to optimize the adsorption treatment of the volatile organic compound to the adsorbent and the desorption treatment of the volatile organic compound from the adsorbent, respectively, and to improve the time and / or energy treatment efficiency. This can be improved compared to the prior art.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a front view showing a configuration of a VOC (volatile organic compound) recovery apparatus A according to the first embodiment, and FIG. 2 is a side view of the VOC recovery apparatus A. As shown in these drawings, the present VOC recovery device A is provided in a flow path of a VOC-containing gas that is a gas to be processed, and adsorbs and recovers VOC contained in the VOC-containing gas. A traveling belt 2A, two sprockets 2B and 2B, a rotation drive unit 3, an adsorbent filler 4, a desorption chamber 5, an adsorbent transfer device 6, a clutch door 7, a desorption gas supply device 8, and a compressed air supply device 9 are provided. Yes.

  The adsorption chamber 1 is an open space that is provided in a part of the channel having a rectangular cross section and communicates with the channel. As shown in the drawing, a plurality of adsorbent fillers 4 connected and attached to the outer periphery of the circulating belt 2A are accommodated in the adsorption chamber 1. The circulating belt 2A is a chain wound around a pair of upper and lower sprockets 2B, 2B, and is connected to a plurality of adsorbent fillers 4 by a holder (not shown) provided on the outer periphery at predetermined intervals. And detachably supported.

The rotation drive unit 3 applies rotational power to one of the pair of sprockets 2B, 2B, thereby causing the adsorbent filler 4 held by the circulating belt 2A to be orthogonal to the extending direction of the flow path as indicated by an arrow. It is to make a patrol in the direction.
The circulating belt 2A, the sprockets 2B and 2B, and the rotation driving unit 3 constitute an adsorbent circulating unit in the present embodiment.

  As shown in FIG. 3, the adsorbent filler 4 includes an adsorbent container 4a (adsorbent container) formed in a quadrangular prism shape and a granular adsorbent 4b filled in the adsorbent container 4a. It is configured. The adsorbent container 4a is formed to be freely permeable so that the VOC-containing gas can pass therethrough. That is, as shown in FIG. 3, the VOC-containing gas can pass through the surface of the adsorbent container 4 a that is in contact with the circulating belt 2 </ b> A, the opposing surface of the surface, and the two surfaces orthogonal to the extending direction of the flow path. As described above, a mesh portion 4c is provided. The mesh portion 4c is formed with a large number of holes smaller than the particle size of the adsorbent 4b, and is formed of, for example, punching metal. The adsorbent 4b is, for example, activated carbon. In addition, the shape of the adsorbent container 4a, that is, the shape of the adsorbent filler 4 may be a shape other than the quadrangular prism shape, for example, a cylindrical shape or a polygonal prism shape.

  In this way, a plurality of adsorbent fillers 4 that are supported adjacent to the circulating belt 2A in the adsorbing chamber 1 are arranged densely without gaps, and the plurality of adsorbent fillers 4 arranged densely. Is a state directly facing the flow path of the VOC-containing gas, that is, completely blocks the flow path. Therefore, the VOC-containing gas that has flowed in the flow path from the upstream side passes through the adsorbent filler 4 formed so as to be freely ventilated as described above, and flows downstream. Here, a sealing material made of rubber or the like is provided on the surface of each adsorbent filler 4 or the inner surface of the adsorption chamber 1 so that the VOC-containing gas does not flow around the adsorbent filler 4 downstream. Yes.

  As shown in FIG. 2, the desorption chamber 5 is a quadrangular prism-shaped space provided adjacent to the uppermost portion of the adsorption chamber 1, and is separated from the adsorption chamber 1 by a clutch door 7. The desorption chamber 5 has a capacity for accommodating one adsorbent container 4a. The desorption chamber 5 has an inlet 5a for taking in water vapor as a desorption gas from the desorption gas supply device 8 and taking in pressurized air from the compressed air supply device 9 near one end, and an adsorbent in the adsorbent container 4a. Discharge ports 5b for exhausting VOC-containing water vapor including VOC desorbed from 4b and pressurized air to the outside are provided in the vicinity of the other end. Further, on the inner surface of the desorption chamber 5, the water vapor (desorption gas) supplied to the inlet 5a bypasses the adsorbent filler 4 and does not flow toward the discharge port 5b. An intimate sealing material is provided.

  The adsorbent transfer device 6 transfers the adsorbent container 4a located at the uppermost part of the adsorption chamber 1 to the desorption chamber 5 as described above. For example, the uppermost part is pressed by pressing the end surface of the adsorbent container 4a from the rear. This is a hydraulic cylinder that transfers one adsorbent container 4 a located at the position from the adsorption chamber 1 to the desorption chamber 5. The adsorbent container 4a located at the top of the adsorption chamber 1 to be transferred is in a state in which the connection with the circulating belt 2 is released, and in this state, the adsorbent container 4a is transferred to the desorption chamber 5 by the transfer device 6.

As shown in the figure, the clutch door 7 opens and closes with the upper end of the suction chamber 1 as a fulcrum, and the desorption chamber 5 and the suction chamber 1 are divided or connected as a normal body. The desorption gas supply device 8 generates steam that is a desorption gas and supplies it to the desorption chamber 5, and is, for example, a boiler. The compressed air supply device 9 generates compressed air heated to a pressure higher than normal pressure and higher than normal temperature by compressing and heating the outside air, and is, for example, a compressor having a heating function. is there.
Of the above-described constituent elements, the rotation drive unit 3, the adsorbent transfer device 6, the clutch door 7, the desorption gas supply device 8, and the compressed air supply device 9 are uniformly controlled by a control device (not shown).

  Next, the VOC recovery process of the VOC recovery apparatus A configured as described above will be described in detail. In the VOC recovery process in the VOC recovery apparatus A, the adsorption process in the adsorption chamber 1, the transfer process of the adsorbent filler 4 between the adsorption chamber 1 and the desorption chamber 5, the desorption preparation process and the desorption process in the desorption chamber 5 are performed. By sequentially repeating the above, VOC is recovered from the VOC-containing gas that is the processing target gas. Hereinafter, details of each process will be described in detail.

[Adsorption process]
In the adsorption step, the adsorption chamber 1 and the desorption chamber 5 are completely separated by closing the clutch door 7. In this state, the rotation driving unit 3 supplies the VOC-containing gas from the flow path to the adsorption chamber 1 while the circulating belt 2A circulates intermittently at predetermined time intervals. The VOC-containing gas passes through the respective adsorbent fillers 4 arranged so as to completely block their own passages, and then flows downstream, and during this passage, the inside of each adsorbent filler 4 VOC is adsorbed on the adsorbent 4b. That is, the VOC-containing gas is sequentially adsorbed in the adsorbent fillers 4 that circulate in the vertical direction in the adsorbent fillers 4 in the adsorption chamber 1, thereby removing the VOCs as processed gas. It is discharged downstream.

[Transfer process]
In such an adsorption process, the adsorption amount of VOC in the adsorbent 4b in each adsorbent filler 4 gradually increases according to the elapsed time of the adsorption process, and the adsorption capacity gradually decreases. The adsorbent filling body 4 positioned at the uppermost portion of the adsorption chamber 1 due to the intermittent movement of the adsorbent is somewhat disconnected, and the clutch door 7 is disengaged from the circulation belt 2A during the movement stop period. The adsorption chamber 1 and the desorption chamber 5 are in communication with each other. When the adsorbent filler 4 is transferred from the adsorption chamber 1 to the desorption chamber 5 by the transfer device 6 and completely accommodated in the desorption chamber 5, the clutch door 7 is closed and the adsorption chamber 1 and the desorption chamber 5 are closed. And are separated.

[Desorption preparation process]
When such a transfer step is completed, in the desorption preparation step, compressed air heated to, for example, 100 to 400 ° C. is supplied from the compressed air supply device 9 to the desorption chamber 5 so that the inside of the desorption chamber 5 is maintained at normal pressure. Is pressurized and heated to a predetermined pressure higher than the normal temperature. The temperature in the desorption chamber 5 is heated to, for example, 100 ° C. or higher.

[Desorption process]
When such a desorption preparation process is completed, the desorption process is started by supplying water vapor to the desorption chamber 5 from the desorption gas supply apparatus 8 instead of the compressed air supply apparatus 9. In this desorption step, VOC is desorbed from the adsorbent 4b by the action of water vapor and mixed into the water vapor, and is discharged from the desorption chamber 5 as VOC-containing water vapor. Here, in the desorption preparation process, which is a pre-process of the desorption process, since the desorption chamber 5 is heated to 100 ° C. or higher, the water vapor condensed in the desorption chamber 5 is the amount of heat required to heat the adsorbent 4b. Therefore, it is possible to minimize the equipment for treating the condensed water of water vapor as drain water.

[Transfer process]
When the VOC is sufficiently desorbed from the adsorbent 4b in such a desorption process, the supply of water vapor from the desorption gas supply device 8 to the desorption chamber 5 is stopped and the clutch door 7 is opened, and the adsorption chamber 1 and the desorption chamber 5 are opened. Will be in communication again. The desorbed adsorbent filler 4 is transferred from the desorption chamber 5 to the adsorption chamber 1 by the transfer device 6, and when completely accommodated in the adsorption chamber 1, the clutch door 7 is closed and desorbed from the adsorption chamber 1. The chamber 5 is separated and further connected to the circulating belt 2. In this state, the circulating belt 2 is circulated by the rotation drive unit 3 and again used for VOC adsorption.

According to the present embodiment, the following effects are obtained.
(1) Since the adsorption process is performed in the adsorption chamber 1 and the desorption process is performed in the desorption chamber 5, the degree of freedom in each process is improved as compared with the conventional method. For example, the passage cross-sectional area of the VOC-containing gas in the adsorption chamber 1, that is, the cross-sectional area of the adsorbent 4 b composed of the side surfaces of the plurality of adsorbent fillers 4 is the water vapor in the desorption chamber 5 that accommodates one adsorbent filler 4. Is different (small) from the cross-sectional area of the adsorbent 4b formed by the end face of one adsorbent filler 4, so that the flow rate of water vapor (desorption gas) is different from the flow rate of the VOC-containing gas. It is possible to set optimally irrespective of this, and to improve energy processing efficiency rather than before.

(2) Further, in the prior art, a purge process and a cooling process are necessary after the desorption process, but the adsorption process is performed in the adsorption chamber 1 and the desorption process is performed in the desorption chamber 5, so the purge process and the cooling process are unnecessary. Therefore, according to the present embodiment, the temporal processing efficiency can be improved as compared with the prior art.
(3) Since the volume of the desorption chamber 5 is significantly smaller than the volume of the adsorption chamber 1, the pressurization and heating time in the desorption preparation step can be significantly shortened compared with the case where the desorption chamber 5 is performed in the adsorption chamber as in the prior art. . Also by this, the temporal processing efficiency can be improved as compared with the prior art.

[Second Embodiment]
4 is a front view showing the configuration of the VOC recovery device B according to the second embodiment, FIG. 5 is a side view of the VOC recovery device B, and FIG. 6 is a top view of the VOC recovery device B. The VOC recovery device A according to the first embodiment is provided with the adsorption chamber 1 and the desorption chamber 5 as separate chambers, but the VOC recovery device B has the functions of the adsorption chamber 1 and the desorption chamber 5. In the processing chamber 10 that is also included, adsorption, desorption, and recovery of VOC contained in the VOC-containing gas are performed.

  The processing chamber 10 is a rectangular parallelepiped open space provided in a part of the flow path having a rectangular cross section and communicating with the flow path. In the processing chamber 10, a granular adsorbent 11 housed in a cuboid container that can be ventilated is housed so as to completely block the flow path. In addition, a slide door 12 is provided at the entrance (upstream side of the adsorbent 11) of the processing chamber 10 and a slide door 13 is provided at the exit (downstream side of the adsorbent 11). The sliding door 12 is a rectangular door that is inserted into the processing chamber 10 by moving forward and completely closes the inlet as shown in FIG. The slide door 13 is a door having the same shape as the slide door 12, and completely closes the outlet of the processing chamber 10 by moving forward.

  Here, the rectangular parallelepiped processing chamber 10 is also closely packed with a rectangular parallelepiped adsorbent 11, but the shape of the processing chamber 10 (that is, the shape of the adsorbent 11) is as shown in FIGS. Furthermore, the passage cross section (first cross section) of the VOC-containing gas is set to be larger than the passage cross section (second cross section) of the desorption gas. That is, the rectangular shape of the processing chamber 10 shown in FIG. 4 corresponds to the cross section (second cross section) of the desorption gas, and the side shape of the processing chamber 10 shown in FIG. 5 is the cross section of the VOC-containing gas (first cross section). 4, and the front shape of the processing chamber 10 shown in FIG. 4 corresponds to the desorption gas passage cross section (second cross section), but the second cross section is significantly smaller than the first cross section. It has an area (cross-sectional area).

  In the adsorption process of the VOC recovery apparatus B, the slide doors 12 and 13 are retracted and the adsorbent 11 is exposed in the flow path. In this state, the VOC-containing gas that has flowed from the upstream in the flow path passes through the adsorbent 11 and flows downstream, so that the VOC is adsorbed by the adsorbent 11 and removed.

  On the other hand, in the detaching process of the VOC recovery device B, the sliding doors 12 and 13 move forward and the adsorbent 11 is completely isolated from the flow path. In this state, the desorption gas is supplied into the processing chamber 10 from a direction perpendicular to the flow path, that is, the horizontal direction, and the VOC adsorbed by the adsorbent 11 is desorbed by the action of the desorption gas.

  That is, in this VOC recovery device B, as shown in the top view of FIG. 6, the passing direction of the VOC gas in the adsorbent 11 and the passing direction of the desorption gas are orthogonal to each other on the horizontal plane, and the VOC-containing gas is absorbed during the adsorption. While passing through the first cross section (cross section perpendicular to the extending direction of the flow path) in the adsorbent 11, the second cross section (flow path) in which the desorption gas is significantly smaller than the first cross section during desorption. Through a cross section parallel to the extending direction).

  Therefore, according to the present embodiment, unlike the first embodiment described above, in the processing chamber 10 provided as a single chamber, the desorption gas has a greater passage area in the adsorbent 11 than the VOC-containing gas. Since it can be set small, the flow rate of the desorption gas can be optimally set regardless of the flow rate of the VOC-containing gas, and the energy processing efficiency can be improved as compared with the prior art.

[Third Embodiment]
FIG. 7 is a front view showing the configuration of the VOC recovery device C according to the third embodiment, and FIG. 8 is a view taken along the line AA in FIG. In FIGS. 7 and 8, the same components as those in the first and second embodiments described above are denoted by the same reference numerals.

  The VOC recovery device A according to the first embodiment adsorbs VOC while circulating the adsorbent filling body 4 in which the adsorbent 11 is accommodated in the adsorbent container 4a in the flow path of the VOC-containing gas, and adsorbs at the time of desorption. As shown in FIGS. 7 and 8, the VOC recovery device C is used to move the adsorbent filler 4 to a desorption chamber 5 provided separately. The container 15 includes two adsorbent fillers 4A1 and 4A2 which are connected in a foldable manner.

  The adsorbent fillers 4A1 and 4A2 are individually accommodated in a folded state in the two desorption chambers 5A1 and 5A2 formed on the flow path wall (lower side wall) of the VOC-containing gas. Yes. The adsorbent fillers 4A1 and 4A2 are driven by the driving device 16 to be set in an open state, a folded state, and an accommodation state in the desorption chambers 5A1 and 5A2.

That is, in this VOC recovery device C, as shown in FIG. 7, the state in which one adsorbent filler 4A1 is opened by the operation of the drive device 16 to block the flow path of the VOC-containing gas with a plurality of flat containers 15. At this time, the other adsorbent filler 4A2 is folded by the operation of the driving device 16 so as to be separated and accommodated in the desorption chamber 5A2. By alternately repeating these two states for the two adsorbent fillers 4A1 and 4A2, VOC is adsorbed on one of the two adsorbent fillers 4A1 and 4A2, and at the same time, the desorption gas is vertically moved in the desorption chamber. The VOC adsorbed by the adsorbent 11 by being inserted is desorbed and recovered.
This VOC recovery device C can also achieve the same effects as the VOC recovery devices A and C of the first and second embodiments described above.

  Here, as shown in FIG. 7 and FIG. 8, the adsorbent filler 4A1 is not in a state in which the plurality of flat containers 15 form a single plane at the time of VOC adsorption. It is in a state of being bent at a certain angle. This state is not a state in which each flat container 15 is directly opposed to the VOC-containing gas, that is, orthogonal to the passing direction of the VOC-containing gas. That is, in the present VOC recovery device C, by not making each flat container 15 orthogonal to the passing direction of the VOC-containing gas, each flat container 15 has a VOC-containing gas passing distance in the adsorbent 11 of the VOC-containing gas. It is set longer than when orthogonal to the passing direction. According to the present VOC recovery device C, it is possible to improve the VOC adsorption efficiency as the passing distance becomes longer.

The present invention is not limited to the above-described embodiments. For example, the following modifications can be considered.
(1) In the first embodiment, one desorption chamber 5 is provided adjacent to the uppermost portion of the adsorption chamber 1, and only the adsorbent filler 4 positioned at the uppermost portion is transferred to the desorption chamber 5 for desorption processing. However, in addition to the uppermost part of the adsorption chamber 1, the desorption chamber 5 may be provided at the lowermost part, and the desorption process may be performed in parallel in a total of two desorption chambers 5.

(2) In the first embodiment, the desorption chamber 5 is set to have a shape that accommodates one adsorbent filler 4, but a plurality of (for example, two) adsorbent fillers 4 are included in the desorption chamber 5. May be formed so that a plurality of detaching processes can be performed simultaneously.
(3) In the first embodiment, the configuration in which the quadrangular prism-shaped adsorbent fillers 4 are arranged in a line on the outer peripheral side of the circulating belt 2A is adopted. However, the shape and arrangement method of the adsorbent fillers 4 are the same. It is not limited.
(4) The configuration of the adsorbent transfer device 6 and the adsorbent circulating means is not limited to the configuration of the first embodiment. Further, the desorption gas is not limited to water vapor, and the adsorbent is not limited to activated carbon.

(5) In the first embodiment, the adsorbent filler 4 is transferred from the adsorption chamber 1 to the desorption chamber 5 and desorbed, but instead, the desorption chamber 5 is moved into the adsorption chamber 1. Alternatively, one or a plurality of adsorbent fillers 4 may be separated and desorbed. That is, instead of the adsorbent transfer device 6, a desorption chamber transfer device that transfers the desorption chamber 5 into the adsorption chamber 1 and accommodates the adsorbent filler 4 may be provided.

(6) In the first embodiment, the adsorbent filler 4 is circulated in the adsorption chamber 1 by the adsorbent circulation means. Instead, the desorption chamber 5 can be freely circulated to fill the adsorbent. The body 4 may be sequentially detached. That is, a desorption chamber circulating means for circulating the desorption chamber 5 in a certain direction along the arrangement direction of the adsorbent filler 4 is provided, and the adsorbent filler 4 at a position corresponding to the circulation position of the desorption chamber 5 is sequentially accommodated. Alternatively, the desorption chamber 5 may be moved.

(7) Although the two adsorbent fillers 4A1 and 4A2 are provided in the flow path of the VOC-containing gas in the third embodiment, the present invention is not limited to this. Further, by providing a larger number of adsorbent fillers, the VOC-containing gas may pass through the plurality of adsorbent fillers so that the VOC is more reliably recovered.

(8) In the third embodiment, the flat containers 15 are not orthogonal to the passing direction of the VOC-containing gas, but may be orthogonal. In particular, in the case where more adsorbent fillers are provided as described above, the passage distance of the VOC-containing gas through the adsorbent 11 can be easily secured, so that each flat container 15 can be placed in the direction in which the VOC-containing gas passes. May be made orthogonal to each other.

It is a front view which shows the structure of the VOC collection | recovery apparatus A concerning 1st Embodiment of this invention. It is a side view which shows the structure of the VOC collection | recovery apparatus A concerning 1st Embodiment of this invention. It is a perspective view which shows the structure of the adsorbent filler 4 in 1st Embodiment of this invention. It is a front view which shows the structure of the VOC collection | recovery apparatus B concerning 2nd Embodiment of this invention. It is a side view which shows the structure of the VOC collection | recovery apparatus B concerning 2nd Embodiment of this invention. It is a top view which shows the structure of the VOC collection | recovery apparatus B concerning 2nd Embodiment of this invention. It is a front view which shows the structure of the VOC collection | recovery apparatus C concerning 3rd Embodiment of this invention. It is an AA arrow line view in FIG.

Explanation of symbols

  A, B, C: VOC recovery device, 1 ... Adsorption chamber, 2A ... Cyclic belt, 2B ... Sprocket, 3 ... Rotation drive part, 4, 4A1, 4A2 ... Adsorbent filler, 4a ... Adsorbent container, 4b ... Adsorption 4c ... mesh part, 5, 5A1, 5A2 ... desorption chamber, 6 ... adsorbent transfer device, 7 ... clutch door, 8 ... desorption gas supply device, 9 ... compressed air supply device, 10 ... treatment chamber, 11 ... adsorption Agent, 12, 13 ... slide door, 15 ... flat container

Claims (16)

In a volatile organic compound recovery apparatus that adsorbs a volatile organic compound contained in a gas to be treated to a predetermined adsorbent and desorbs and recovers the volatile organic compound adsorbed on the adsorbent using a predetermined desorption gas.
Volatile, characterized in that it is filled with an adsorbent and has a treatment chamber in which the gas to be treated passes through the first cross section of the adsorbent and the desorption gas passes through a second cross section smaller than the first cross section. Organic compound recovery device. In a volatile organic compound recovery apparatus that adsorbs a volatile organic compound contained in a gas to be treated to a predetermined adsorbent and desorbs and recovers the volatile organic compound adsorbed on the adsorbent using a predetermined desorption gas.
An adsorption chamber through which the gas to be treated passes,
A breathable adsorbent filler disposed in the adsorption chamber and filled with an adsorbent;
A desorption chamber that is arranged separately from the adsorption chamber and desorbs volatile organic compounds from the adsorbent of the adsorbent filler using a desorption gas;
A volatile organic compound recovery device comprising: an adsorbent transfer device for transferring an adsorbent filler between an adsorption chamber and a desorption chamber. A plurality of adsorbent fillers that store the adsorbent separately and are arranged adjacent to each other,
3. The volatile organic compound recovery apparatus according to claim 2, wherein the adsorbent transfer device sequentially moves the adsorbent filler that adsorbs the volatile organic compound from the adsorption chamber to the desorption chamber. Further comprising adsorbent circulation means for circulating the adsorbent filler in a certain direction in the adsorption chamber,
4. The volatile organic compound recovery device according to claim 3, wherein the adsorbent transfer device moves the adsorbent filler that has moved to a specific position to the desorption chamber.   3. The volatile organic compound recovery device according to claim 2, further comprising a desorption chamber transfer device that transfers the desorption chamber into the adsorption chamber and accommodates the adsorbent filler instead of the adsorbent transfer device. A plurality of adsorbent fillers that store the adsorbent separately and are arranged adjacent to each other;
A desorption chamber circulating means for circulating the desorption chamber in a fixed direction along the arrangement direction of the adsorbent filler,
6. The volatile organic compound recovery apparatus according to claim 5, wherein the adsorbent filler at a position corresponding to the circulation position of the desorption chamber is sequentially accommodated by the desorption chamber transfer device and the desorption chamber circulation means.   The volatile organic compound recovery device according to any one of claims 2 to 6, wherein the desorption chamber has a volume for accommodating one adsorbent filler.   The volatile organic compound recovery apparatus according to any one of claims 2 to 7, wherein the adsorption chamber is a part of a flow path through which the gas to be processed passes. In a volatile organic compound recovery method in which a volatile organic compound contained in a gas to be treated is adsorbed on a predetermined adsorbent, and the volatile organic compound adsorbed on the adsorbent is desorbed and recovered using a predetermined desorption gas.
A method for recovering a volatile organic compound, characterized in that a gas to be treated passes through a first cross section of an adsorbent and a desorption gas passes through a second cross section smaller than the first cross section. In a volatile organic compound recovery method in which a volatile organic compound contained in a gas to be treated is adsorbed on a predetermined adsorbent, and the volatile organic compound adsorbed on the adsorbent is desorbed and recovered using a predetermined desorption gas.
Adsorption of volatile organic compounds to the adsorbent is performed in a predetermined adsorption chamber, and by moving the adsorbent, desorption of the volatile organic compound from the adsorbent is performed in a desorption chamber provided separately from the adsorption chamber. A characteristic volatile organic compound recovery method. The adsorbent is divided and packed into a plurality of ventilated adsorbent containers and stored in the adsorption chamber, and the adsorbent containers filled with the adsorbent adsorbing volatile organic compounds are sequentially moved from the adsorption chamber to the desorption chamber for desorption. It processes. The volatile organic compound collection | recovery method of Claim 10 characterized by the above-mentioned. The volatile organic compound recovery method according to claim 11, wherein the adsorbent container is circulated in a certain direction in the adsorption chamber, and the adsorbent container moved to a specific position is moved to the desorption chamber for desorption treatment.   The volatile organic compound recovery method according to claim 10, wherein, instead of transferring the adsorbent, the desorption chamber is transferred into the adsorption chamber to accommodate the adsorbent filler. The adsorbent is divided and filled into a plurality of ventilated adsorbent containers and placed adjacent to the adsorption chamber.
The desorption chamber is circulated in a certain direction along the arrangement direction of the adsorbent containers, and the adsorbent filler at a position corresponding to the circulating position of the desorption chamber is sequentially accommodated in the desorption chamber for desorption treatment. 14. The method for recovering a volatile organic compound according to 13.   The method for recovering a volatile organic compound according to any one of claims 10 to 14, wherein the desorption chamber has a capacity for accommodating one adsorbent container.   The method for recovering a volatile organic compound according to any one of claims 10 to 15, wherein the adsorption chamber is a part of a flow path through which the gas to be treated passes.

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