JP3331264B2 - Exhaust gas concentration treatment method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas concentration treatment method and apparatus.

[0002]

2. Description of the Related Art As is well known, paints, printing inks, and adhesives contain organic solvents, and these exhaust gases are emitted to the atmosphere during painting of automobiles, printing of newspapers and magazines, and other processes. Will be released.

[0003] In recent years, in order to prevent air pollution by exhaust gas, an exhaust gas concentration treatment system for continuously treating these exhaust gases and concentrating and recovering the contained organic solvent has been known.

[0004] The above-mentioned conventional exhaust gas enrichment treatment system includes:
A rotary drum for exhaust gas concentration treatment is filled with a sheet-shaped adsorbent in a honeycomb shape, or the adsorbent is arranged in a cylindrical shape and arranged radially so that the rotary drum is continuously rotated at a constant speed. I have.

[0005] Exhaust gas is introduced from one side of the rotating drum and led out to the other side, the organic solvent contained in the exhaust gas is adsorbed by the adsorbent, and hot air is blown at the solvent desorption station. The solvent introduced and adsorbed on the adsorbent is desorbed and discharged to recover the solvent.

[0006]

However, when the rotating drum is continuously rotated, even if the rotating drum is radially partitioned at regular intervals, the exhaust gas is mixed with the hot air and discharged at the solvent desorption station. Even if the solvent adsorbed by the adsorbent is recovered by hot air, the exhaust gas is discharged and released into the atmosphere as it is, causing waste in the concentration treatment of the exhaust gas and releasing the solvent to pollute the air. Was something.

Further, there has been proposed an apparatus in which an adsorbent of an adsorption filter unit is radially arranged on a rotating body, and intermittently rotates at every installation pitch of the adsorbent to efficiently perform an exhaust gas concentration treatment. However, since a large rotating body is supported by the central shaft, or a circular bearing is fitted around the rotating body and supported, these shaft supporting parts are formed into a molded body with a precise outer or inner diameter finish. The cost was high.

[0008]

【The invention's effect】

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in consideration of the above-described problems, and has been made in consideration of the above-described problems by providing a cylindrical rotating device for exhaust gas enrichment processing on one side of a central portion of the rotating device. An exhaust gas inlet and an exhaust gas outlet on the other side are provided, and the lower peripheral part of the bottom side of the rotating device is supported by a shaft support at a predetermined interval so that the rotating device can be driven to rotate in a centerless state. Then, a cylindrical body for exhaust gas distribution is radially arranged in the rotating device for the exhaust gas concentration treatment, and a concentrator element for solvent adsorption is provided concentrically on the cylindrical body, and the rotating device is radially mounted on the rotating device. The rotating device, which is supported intermittently in a centerless state at predetermined time intervals by the pitch angle of the arranged cylindrical body, is rotationally driven, and exhaust gas is introduced from the exhaust gas inlet side at the center of one side and exhaust gas at the center of the other side. Solvent desorption step Except for the exhaust portion, the exhaust gas introduced from the exhaust gas inlet side flows through the concentrator element to adsorb the solvent in the exhaust gas, and the joined body is joined to both sides of the cylindrical body at the solvent desorption station. It is another object of the present invention to provide an exhaust gas concentration treatment method and apparatus, wherein hot air or steam is circulated through a joined body to recover a solvent adsorbed on a concentrator element.

[0009]

When the exhaust gas concentration treatment method and apparatus according to the present invention are used, the rotating apparatus is rotatably supported in a centerless manner because the lower peripheral portion of the rotating apparatus is pivotally supported. There is no need to make a molded product with an outer or inner diameter finish, and it can be manufactured at low cost. And, by radially disposing a cylindrical body for exhaust gas distribution in a rotating device for exhaust gas enrichment treatment and detachably installing the concentrator element concentrically in this cylindrical body, the concentrator element can be easily manufactured. The concentrator element can be easily replaced and the labor can be saved.

In addition, the rotating device is intermittently rotated at a predetermined time interval by a pitch angle of a cylindrical member radially disposed on the rotating device, and at both sides of the cylindrical member at a solvent desorption station. By joining the joined body and flowing the hot air through the joined body through the tubular body to collect the solvent adsorbed on the concentrator element, the exhaust gas and the hot air are mixed in the solvent desorption station. Can be reliably prevented, and the exhaust gas concentration treatment can be performed without waste and without releasing the solvent to the atmosphere.

In particular, by mixing steam with air as hot air and circulating the air through the concentrator element, the exhaust gas can be concentrated economically and safely, and the heat generation of the fibrous activated carbon concentrator element can be suppressed. Can be processed.

In addition, a lower peripheral portion of the bottom surface of the rotating device is supported by a shaft supporting portion at a predetermined interval, and a pressing portion is disposed at a predetermined interval on the upper peripheral portion of the upper surface of the rotating device. By rotating without rotating, the above-described rotating device can be prevented from floating and can be rotated.

When steam is used in place of hot air, the solvent adsorbed on the concentrator element can be collected and passed through a condensing device without passing through an adsorption can or the like, and the solvent can be recovered. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. 1 and 2 show an embodiment of the present invention. The exhaust gas concentration treatment device 1 has a cylindrical rotating device 3 rotatably mounted in a rectangular box 2 as shown in FIGS.
Exhaust gas is introduced from the exhaust gas inlet 4 on one side of the box body 2 and led out from the exhaust gas outlet 5 on the other side, and the solvent is recovered at the upper solvent desorption station 6 part.

The rotating device 3 has a cylindrical shape having a predetermined width and a predetermined diameter as shown in FIGS. 1 and 2, and a cylindrical member 7 having a predetermined diameter is radially arranged at a constant interval on a peripheral side thereof. A ring core such as fibrous activated carbon or zeolite is provided on the cylindrical body 7.
The concentrator elements 8 are concentrically provided at predetermined intervals and are detachably mounted.

As shown in FIGS. 1 and 2, the cylindrical body 7 has a blind lid-shaped central portion on the exhaust gas introduction side and a flange-shaped protruding side on the outlet side. The element 8 is inserted between them, and its flange and the like are detachably locked and fixed with appropriate fasteners such as thumb screws, and the exhaust gas introduced into the box 2 from the exhaust gas inlet 4 is formed into a cylindrical body. 7, flows from the outer peripheral surface side of the concentrator element 8 of the ring core to the inner peripheral surface side,
The solvent contained in the exhaust gas is adsorbed by the concentrator element 8,
The exhaust gas is discharged to the exhaust gas outlet 5 on the outlet side of the box 2.

A valve plate is disposed on the solvent desorption station 6 at the upper part of the rotating device 3 from both side surfaces of the box 2 facing the cylindrical body 7 of the rotating device 3 as shown in FIG. The joints 9 each having a shape of a circle are detachably provided by a detaching device 10 for a cylinder.

As shown in FIG. 2, a hot air supply duct 12 and a hot air discharge duct 13 each having an expansion / contraction portion 11 are connected to the joined body 9 to form a hot air generation blower mounted on the upper surface of the box 2. The hot air of a predetermined temperature supplied from the hot air supply device 14 opens and closes the on-off valve 15 to flow from the inner peripheral surface of the concentrator element 8 of the ring core to the outer peripheral surface, and flows out to the inner peripheral side of the cylindrical body 7. The solvent adsorbed on the concentrator element 8 is desorbed and discharged.

The above-mentioned rotating device 3 is similar to that shown in FIGS.
As shown in the figure, the bottom side is mounted on a shaft support 16 suspended at a fixed interval, and a holding part 17 is disposed on the top side to prevent floating, so that the rotating device 3 is in a so-called centerless state. It is rotatably mounted. The teeth 18 of a predetermined module are provided around the periphery of the rotating device 3, and are engaged with the driving gear 20 of the rotating drive device 19 disposed on the bottom surface side, and the rotating drive device 19 is fixed at predetermined time intervals. And the rotary device 3 is intermittently driven to rotate by the arrangement pitch angle of the cylindrical body 7.

The means for positioning the rotation angle of the rotation device 3 can be appropriately performed by, for example, arranging a positioning pin or the like on the periphery of the rotation device 3 and detecting it with a detector such as a proximity sensor. It is.

When the exhaust gas generated during painting or printing is introduced from the exhaust gas inlet 4 of the exhaust gas enrichment treatment apparatus 1, the exhaust gas flows into the cylindrical body 7, and the ring core in the cylindrical body 7 is concentrated. The solvent in the exhaust gas is adsorbed by penetrating from the outer peripheral surface to the inner surface of the element 8 and discharged from the exhaust gas outlet 5.

The rotating device 3 includes a rotary driving device 19,
The solvent in the exhaust gas is adsorbed to the concentrator element 8 as described above by intermittently rotating the pitch angle of the cylindrical member 7 every minute, and the solvent in the upper part of the rotating device 3 is rotated. When the tubular body 7 stops at a predetermined position in the attaching / detaching station 6, the attachment / detachment device 10 is operated to join the joined bodies 9 to both surfaces of the tubular body 7 respectively, and the on-off valve 15 is opened to open the hot air supply device. The hot air circulates from 14 and the solvent adsorbed on the concentrator element 8 is desorbed and recovered.

The solvent desorbed by the hot air can be sent together with the hot air to a separately provided solvent recovery processing device (not shown), and can be recovered by distillation or the like.

Therefore, the exhaust gas and the hot air are not mixed in the solvent desorption station, the waste gas is not wastefully treated, the solvent in the exhaust gas can be reliably adsorbed to the concentrator element, and the adsorbed solvent can be removed. It can be desorbed and collected by hot air.

When the adsorbing capacity of the concentrator element is reduced, the side panel of the box of the exhaust gas concentrator is opened,
By removing the flange of the cylindrical body of the rotating device, the concentrator element of the ring core can be easily taken out and replaced.

Also, since the rotating device pivotally supports the bottom surface side, it can be driven to rotate in a so-called centerless manner. Even if the device is large, it is not necessary to form a molded product having a precise outer or inner diameter finish. It is preferable because it can be manufactured at a low cost.

As the hot air, it is preferable to use air at a low cost, and it is preferable to mix it with a small amount of water vapor of 1% by weight or less. Can be.

In the above embodiment, the concentrator element and the cylindrical body on which the concentrator element is mounted are formed into a cylindrical shape which is easy to mold. However, if necessary, the concentrator element may be formed into a rectangular cylindrical shape or a flat cylindrical shape. The present invention can be appropriately modified and implemented based on the spirit of the present invention.

A steam may be used in place of the above-mentioned hot air. In this case, the solvent adsorbed on the concentrator element is recovered, and is passed directly to the condenser without passing through the adsorber. Then, the solvent can be recovered.

[0030]

As described above, according to the present invention, the exhaust gas can be introduced from the exhaust gas inlet port on one side of the center of the rotating device and led to the exhaust gas outlet port on the other side. Since the lower peripheral portion can be rotatably driven in a so-called center-less manner, it can be manufactured at a low cost without the necessity of forming a molded product having a precise outer or inner diameter finish even if the device is large. Then, the rotating device, which is supported intermittently in a centerless state at predetermined time intervals by a pitch angle of a cylindrical body radially arranged on the rotating device, is rotationally driven, and exhaust gas is discharged from the central exhaust gas inlet side of one side. To the exhaust gas outlet at the center of the other side,
Except in the exhaust section, the exhaust gas introduced from the exhaust gas inlet side flows through the above-mentioned concentrator element to adsorb the solvent in the exhaust gas,
At the solvent desorption station, the joined body is joined to both sides of the tubular body, and hot air or steam flows through the tubular body through the joined body to collect the solvent adsorbed on the concentrator element.
Mixing of exhaust gas and hot air can be reliably prevented at the solvent desorption station, and exhaust gas treatment can be performed without waste and concentration treatment can be performed without releasing the solvent to the atmosphere.

Further, a cylindrical body for exhaust gas distribution is radially disposed in a rotating device for exhaust gas concentration processing, and a concentrator element is detachably mounted on the cylindrical body in a concentric manner so as to be detachable. The element can be easily inserted and attached to the cylindrical body, and the element of the concentrator can be easily exchanged and labor can be saved.

Further, by mixing steam with air as hot air and passing the mixture through the concentrator element, the exhaust gas can be economically concentrated, and the heat generated by the fibrous activated carbon concentrator element can be suppressed and the processing can be performed safely. be able to.

The lower peripheral portion of the bottom surface of the rotating device is supported by a shaft support at a predetermined interval, and a pressing portion is disposed at a predetermined interval on the upper peripheral portion of the upper surface of the rotating device. -Even if it rotates without, the rotation device can be rotated while being prevented from floating.

[Brief description of the drawings]

FIG. 1 is a rear side view of an embodiment of the present invention, with a part omitted;

FIG. 2 is a side cross-sectional view partially omitted from the above.

[Explanation of symbols]

1. Exhaust gas concentration treatment device 3. Rotating device 6.
Solvent desorption station 7 ... cylindrical body 8 ... concentrator element 9 ...
Bonded body 10 ... Attachment / detachment device 14 ... Hot air supply device 15
... On-off valve 16 ... Shaft support 18 ... Teeth 19
... Rotary drive unit 20 ... Drive gear

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 53/06 B01D 53/34

Claims (5)

(57) [Claims] An exhaust gas inlet is provided on one side of a central portion of a cylindrical rotating device for exhaust gas concentration treatment, and an exhaust gas outlet is provided on the other side, so that the rotating device is rotated in a centerless state. A lower peripheral portion of the bottom side of the rotating device is supported at predetermined intervals by a shaft support so as to be driven, and a cylindrical body for exhaust gas distribution is radially arranged on the rotating device for the exhaust gas concentration treatment. A concentrator element for solvent adsorption is concentrically mounted on the body, and a rotating device that is supported intermittently in a centerless state at predetermined time intervals at a pitch angle of a cylindrical body radially arranged on the rotating device is rotated. The exhaust gas was introduced from the exhaust gas inlet side in the center except for the solvent desorption station by driving the exhaust gas to be introduced from the exhaust gas inlet side in the center of one side and to the exhaust gas outlet side in the center of the other side. Exhaust gas flowing through the concentrator element A solvent is adsorbed, and a joined body is joined to both sides of the tubular body at the solvent desorption station, and hot air or steam flows through the tubular body through the joined body to collect the solvent adsorbed on the concentrator element. An exhaust gas enrichment treatment method characterized by performing. 2. The exhaust gas concentration treatment method according to claim 1, wherein steam is mixed with air as hot air and the mixture is passed through a concentrator element. 3. A lower peripheral portion of the bottom side of the rotating device is supported by a shaft supporting portion at a predetermined interval, and a pressing portion is disposed at a predetermined interval on the upper peripheral portion of the upper surface to support the rotating device in a centerless state. The exhaust gas concentration treatment method according to claim 1 or 2, wherein the rotating device is intermittently driven to rotate by a predetermined pitch angle. 4. An exhaust gas inlet is provided on one side of a central portion of a rotating device for exhaust gas concentration treatment, and an exhaust gas outlet is provided on the other side, so that the rotating device is rotationally driven in a centerless state. The lower peripheral portion of the bottom side of the rotating device is supported at a predetermined interval by a shaft support, and a cylindrical body for exhaust gas distribution is radially arranged on the rotating device for exhaust gas concentration treatment, and concentrically with the cylindrical body. When rotating a rotating device which is provided intermittently in a centerless state at a predetermined time interval at a pitch angle of a cylindrical body in which the above-mentioned rotating device is radially arranged, and which comprises a concentrator element for solvent adsorption in a form. At the solvent desorption station, joints are detachably arranged on both sides of the cylindrical body, and the exhaust gas is introduced from the exhaust gas inlet side at the center on one side and led to the exhaust gas outlet side on the other side. So as to form a solvent desorption station Outside, the exhaust gas introduced from the exhaust gas inlet side flows through the above-mentioned concentrator element so that the solvent in the exhaust gas is adsorbed, and a joined body is joined to both sides of the cylindrical body at the solvent desorption station to join. A pipe for hot air or steam distribution is connected to the joined body so that the solvent adsorbed on the concentrator element can be recovered by flowing hot air or steam through the tubular body through the body, and a pipe on the hot air or steam supply side. An exhaust gas enrichment treatment apparatus characterized in that an on-off valve is arranged to be freely opened and closed. 5. A rotating device for exhaust gas enrichment treatment is mounted on a shaft support provided at a predetermined interval on the bottom side, and teeth of a predetermined module are provided on a peripheral portion of the rotating device, and a driving gear is provided on the teeth. 5. The exhaust gas concentrating treatment apparatus according to claim 4, wherein the rotary device intermittently supported and intermittently supported by the rotary drive device in a centerless state is intermittently driven to rotate by the rotary drive device.