JP2950899B2 - Rotary gas processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a plurality of rotating bodies which are mainly made of fine activated carbon and which can be ventilated in the direction of the axis of the rotating shaft. Inside, an adsorption area for passing the gas to be treated and a desorption area for passing the regeneration gas are provided, and the adsorption areas of each of the rotating bodies are arranged in a series of gas paths to be treated in the direction of the gas path, and A rotation in which the desorption area of each of the rotating bodies is arranged in the regeneration gas air path, so that the gas to be treated can be continuously processed by repeating adsorption and desorption by rotation over the adsorption area and the desorption area of each of the rotating bodies. The present invention relates to a gas processing apparatus.

[Conventional technology]

Conventionally, in the rotary gas processing apparatus as described above, a plurality of rotating bodies each having the same fine activated carbon as the fine activated carbon constituting the rotating bodies have been used.

[Problems to be solved by the invention]

However, if the molecular diameter of the substance to be adsorbed in the gas to be treated (for example, a solvent contained in the exhaust of the coating booth) is average, and the average pore diameter of the constituent fine activated carbon conforms to the average molecular diameter, In the above-described conventional configuration, adsorption and desorption are appropriately performed in each of the rotating bodies, but the molecular diameter is larger than the substance to be adsorbed having the average molecular diameter described above, or the molecular diameter is changed due to deterioration or the like in the adsorption and desorption process. Difficult-to-desorb substances that are not easily desorbed because they have a too large affinity with activated carbon after adsorption because they are likely to have a large diameter and are physically sandwiched in the pores (for example, high boiling solvents and In the case of a gas to be treated which contains a small amount of a polymerizable substance, etc. together with the substance to be adsorbed having the above average molecular diameter, the hardly desorbable substance accumulates on the rotating body without being desorbed in the desorption area after being adsorbed in the adsorption area. Adsorption and desorption efficiency is reduced Life is short by a large margin, also, there is a problem that the increase maintenance costs for that.

An object of the present invention is to solve the above-described problem by rationally configuring a plurality of rotating bodies in which each adsorption region is arranged in a series of gas passages to be processed in the direction of the passage.

[Means for solving the problem]

A first characteristic configuration of the rotary gas processing apparatus according to the present invention is that a plurality of rotating bodies which are mainly made of fine activated carbon and which can be ventilated in the direction of the rotation axis are provided, and each of the rotating bodies has a rotating region. Providing an adsorption area through which a gas to be processed passes and a desorption area through which a regenerating gas passes, and arranging the adsorption areas of each of the rotating bodies in a series of gas paths to be processed in the direction of the air path, In the configuration in which the respective desorption regions are arranged in the regeneration gas airflow path, the fine activated carbon constituting the upstream rotation body located upstream in the gas flow path to be processed among the rotation bodies is disposed in the downstream rotation body located downstream. The structure and the effect of the present invention are as follows.

[Action]

In other words, the fine activated carbon constituting the former rotating body has a larger molecular diameter than the substance to be adsorbed having an average molecular diameter, or even a hardly desorbable substance whose molecular diameter is increased due to alteration or the like, after being adsorbed in the adsorption area, The average pore diameter that can be easily desorbed in the desorption region is relatively large, so that the pre-rotational body is made to have a relatively small amount of difficulties contained in the gas to be treated together with the substance to be adsorbed having the above average molecular diameter. In a state where a dedicated rotating body is used for the desorbable substance, the pre-rotating body absorbs and desorbs the hardly desorbing substance appropriately without accumulating on the rotating body from the gas to be processed, and is difficult to desorb to the latter rotating body. Prevents outflow of sexual substances.

On the other hand, by making the fine activated carbon constituting the former stage rotating body relatively large in average pore diameter adapted to the hard-to-desorb material, the efficiency of adsorption and removal of the former stage rotating body with respect to the substance to be adsorbed having the above average molecular diameter decreases. However, the fine activated carbon constituting the latter rotating body is adapted to the substance to be adsorbed having an average molecular diameter (that is, the gap between the substance to be adsorbed and the pores which enter into the pores is relatively small, and the adsorption effect is small). By making the average pore diameter relatively small in a high state, the substance to be adsorbed having an average molecular diameter is efficiently removed from the gas to be treated by adsorption and desorption in the latter rotating body.

In the latter rotating body, since the hardly desorbable substance has already been removed from the gas to be treated by adsorption and desorption in the upstream preceding rotating body, accumulation of the hardly desorbing substance is avoided, and the average Since the hardly desorbable substance does not hinder the adsorption of the substance to be adsorbed having a typical molecular diameter, the efficiency of separation and collection of the substance to be adsorbed having an average molecular diameter is improved.

〔The invention's effect〕

As a result, according to the first characteristic configuration of the present invention, after a relatively small amount of a non-desorbable substance contained in the gas to be treated is adsorbed together with the substance to be adsorbed having an average molecular diameter, each rotation is performed without being desorbed. Accumulation on the body can be effectively avoided, and the life of each rotating body can be extended as compared with the related art, and the maintenance cost can be greatly reduced.

In addition, the conventionally difficult-to-desorb substances contained in the gas to be treated are continuously separated and collected properly by the absorption and desorption of the rotation of the former rotating body, which has not been able to be properly separated and collected simply by being accumulated on the rotating body. This makes it possible to maintain a high efficiency of separating and collecting the post-rotation body for the substance to be adsorbed having an average molecular diameter, thereby improving the processing performance and versatility of this type of rotary gas processing apparatus. Could be improved.

[Second to Fourth Characteristic Configurations of the Present Invention] The second characteristic configuration of the rotary gas treatment apparatus according to the present invention is as follows.
With respect to the average fine pores of the fine activated carbon constituting the latter rotating body, 1.
If it is more than 1 time and less than 35 °, if this second characteristic configuration is adopted, the experimental results show that the paint solvent is included as the substance to be adsorbed with the average molecular diameter, and it is compared as a substance that is difficult to desorb. In the treatment of exhaust gas from a coating booth containing a small amount of a high boiling point solvent, ketones which are degraded by oxidative decomposition, and a polymerizable substance, the effects of the first characteristic configuration can be remarkably exhibited.

Specifically, in the treatment of exhaust from the painting booth,
In order to efficiently adsorb and desorb the substance to be adsorbed having the average molecular diameter, the average fine pore diameter of the fine activated carbon constituting the post-rotator is
It is desirable to set it within the range of about 14 ° to 23 °.

This is because if the average pore diameter is too small, the affinity between the activated carbon and the substance to be adsorbed is increased and the desorption property is reduced, and if the average pore diameter is too large, the affinity between the activated carbon and the substance to be adsorbed is weakened. For this reason, the adsorptivity decreases, and both of these cases cause a decrease in processing performance.

Further, if the average fine pore diameter of the fine activated carbon constituting the former rotating body is 1.1 times or more the average pore diameter of the fine fine activated carbon constituting the latter rotating body, the desorption property of the hardly desorbable substance in the former rotating body is the latter rotating body. It is significantly improved compared to.

However, when the average pore diameter of the former rotating body is larger than 35 °, the specific surface area of the activated carbon becomes small due to the properties of the activated carbon, and the adsorption capacity decreases, and further, the adsorption efficiency for the hardly desorbable substance occurs. There are cases.

Here, the average pore diameter is a commonly used value,
For example refers to a value calculated by the specific surface area and pore volume determined by BET method using M ₂ gas.

Further, in the molded body such as a honeycomb structure comprising the fine activated carbon and other substances, the specific surface area of the molded body, the average pore diameter of the molded body obtained by measuring the pore volume,
It completely matches the value of the average pore diameter of the fine activated carbon used in the molded article.

A third characteristic configuration of the rotary gas treatment apparatus of the present invention resides in that the rotation speed of the first-stage rotator is lower than the rotation speed of the second-stage rotator. If this third characteristic configuration is adopted, Since the adsorption time in the adsorption zone of the former rotating body and the desorption time in the desorbing area can be made longer than that of the latter rotating body, the adsorption efficiency is low because the quantity is smaller than the substance to be adsorbed having the average molecular diameter, and In addition, the efficiency of adsorption and desorption of the pre-rotation body for hard-to-desorb substances with low desorption efficiency can be improved, whereby the fine activated carbon constituting the pre-rotation body has a relatively large average pore diameter compared to the post-rotation body. Combined with the operation of the first characteristic configuration described above, the desorption efficiency of the pre-rotator to the hardly desorbable substance partially contained in the gas to be processed together with the substance to be adsorbed having an average molecular diameter can be further improved.

A fourth characteristic configuration of the rotary gas processing apparatus according to the present invention resides in that the first-stage rotator has a smaller thickness in the direction of the axis of rotation than the second-stage rotator. Substances are easy to adsorb and the adsorption band may be short, and if the amount of the hard-to-desorb substance is small compared to the substance to be adsorbed with the average molecular diameter, it will rotate even if the thickness of the former rotating body is small. With the backing that the thickness of the rotating body can be reduced because it does not saturate in the body, if this fourth characteristic configuration is adopted, the regeneration gas from the inlet to the outlet of the regeneration gas in the desorption region of the preceding rotating body The temperature drop width of the material can be made smaller than that of the post-rotating body, and the desorption of the hard-to-desorb material that is inherently difficult to desorb compared to the substance to be adsorbed with an average molecular diameter by the above-mentioned temperature drop Maintaining high temperature of regeneration gas by reducing width This can be promoted, and thus, in combination with the operation of the above-described first characteristic configuration, and when the above-described third characteristic configuration is employed, also with the operation of the third characteristic configuration, The efficiency of desorption of hard-to-desorb substances can be further improved.

Further, by reducing the thickness in the rotation axis direction of the former rotating body, that is, in the passing direction of the gas to be treated and the regeneration gas, the pressure loss in the gas path of the gas to be treated and the regeneration gas can be reduced as a whole. The fan power can be saved.

〔Example〕

FIGS. 1 and 2 show a rotary gas processing apparatus in which exhaust gas from a coating booth is used as a gas to be treated, and paint solvents and the like contained in the exhaust gas are separated and collected to purify the exhaust gas as the gas to be treated. And two disk-shaped rotating bodies (1) and (2) having a honeycomb structure using fibrous fine activated carbon as a main component and capable of ventilation in the direction of the rotation axis (P) are formed. ), (2)
Are arranged concentrically within the casing (3) at appropriate intervals.

The casing (3) allows the gas to be treated (G) to flow from one end of the rotating body juxtaposition direction (that is, the direction of the rotation axis (P) of the rotating bodies (1) and (2)). (G) is converted to the two rotating bodies (1), (2) by the same specific phase portions (A ₁ ) and (A ₂ ) in the respective rotating regions.
A series of gas passages (GF) to be processed, which are sequentially passed through (2) and processed, and then discharged from the other end, are formed.

In the casing (3), both rotating bodies (1),
(2) Other same phase portions (B ₁ ) in each rotation range,
In (B ₂ ), high-temperature regeneration gas (H) is applied to each rotating body (1) and (2).
The recirculation gas passages (HF ₁ ) and (HF ₂ ) through which the gas passes are formed.

That is, in the rotation range of each of the rotating bodies (1) and (2),
The specific part (A ₁ ) through which the gas to be treated (G) passes,
(A ₂ ) is the adsorption zone, and the other parts (B ₁ ) and (B ₂ ) through which the regeneration gas (H) is passed are the desorption zones. With the rotation of, the substance to be adsorbed in the gas to be treated (G) (that is, the paint solvent and the like contained in the exhaust gas from the coating booth) in the adsorption areas (A ₁ ) and (A ₂ ) is rotated by the rotating body (1). ) And (2) are adsorbed on the fine activated carbon, and the adsorbed substance is separated from the fine activated carbon of the rotating bodies (1) and (2) in the desorption zones (B ₁ ) and (B ₂ ) at a high temperature. By repeating the desorption into the regeneration gas (H), the paint solvent and the like are continuously separated and collected from the exhaust gas to be processed (G).

In addition, the desorption area (B ₁ ), (B ₂ ) of each rotating body (1), ( ₂ )
The regenerated gas paths (HF ₁ ) and (HF ₂ ) are connected as a series of air paths connected in series to each other, and in this series of regenerated gas paths (HF ₁ ) and (HF ₂ ), both rotating bodies (1) are connected. ),
Between the desorption zones (B ₁ ) and (B ₂ ) of ( ₂ ), the regeneration gas (H) whose temperature has dropped due to passing through the desorption zone (B ₂ ) on the upstream side
Is provided with an intermediate heater (4) for raising the temperature.

The regeneration gas (H) that has passed through both desorption zones (B ₁ ) and (B ₂ ) is then sent to a combustion device, where the desorption material such as solvent contained in the regeneration gas (H) is contained. Is deleted.

The two rotating bodies (1) and (2) are constituted by the fine structure of the former rotating body (1) located upstream of the rotating body (1) and (2) in the gas passage (GF) to be treated. Activated carbon is
The average porosity (d) is larger than that of the fine activated carbon constituting the downstream rotator (2) positioned on the downstream side. Specifically, a general solvent as a main substance to be adsorbed has an average molecular weight. Along with the average molecular diameter of the general solvent, the molecular diameter is larger than the general solvent, or it is difficult to desorb after adsorption because the molecular diameter is easily increased due to deterioration or the like in the adsorption and desorption process (for example, In this example, the exhaust gas from the coating booth containing a small amount of some high-boiling solvents, ketones that are transformed by oxidative decomposition, and polymerizable substances) is used as the gas to be treated (G). As the constituent fine activated carbon, one having an average pore diameter (d ₁ ) in the range of 25 ° to 30 ° and suitable for adsorbing and desorbing (particularly, desorbing) the above-mentioned hardly desorbable substance is used. as a fine activated carbon), an average pore diameter (d ₂₎ is 14 In within the scope of ~23Å are using those suitable for adsorption and desorption of a general solvent as Lord adsorbates of the average molecular diameter.

That is, by applying the fine activated carbon having the above average pore diameter (d ₁ ) to the fine activated carbon constituting the first stage rotating body (1), the first stage rotating body (1) is not desorbed after the hardly desorbable substance is adsorbed.
Is prevented from accumulating in the first stage, whereby the former rotating body (1) is a dedicated rotating body for the hardly desorbable substance contained in the gas to be processed (G) together with the main substance to be adsorbed having an average molecular diameter. In this state, the difficult-to-desorb material is appropriately removed from the gas to be treated (G) by adsorption and desorption in the first rotating body (1), and thereby the hard-to-desorb substance in the second rotating body (2) is removed. Avoid accumulation.

For the substance to be adsorbed (general solvent) having an average molecular diameter which is not adsorbed and captured by the former rotating body (1) and reaches the latter rotating body (2), the average molecular diameter suitable for the adsorption and desorption of the average molecular diameter is obtained. Efficient removal from the gas to be treated (G) by adsorption and desorption in the latter rotating body (2) composed of fine activated carbon having a pore diameter (d ₂ ), and as a whole, rotation due to accumulation of hardly desorbable substances While effectively avoiding a reduction in the life of the bodies (1) and (2), each of the substance to be adsorbed (general solvent) and the hardly desorbable substance having an average molecular diameter can be efficiently separated and collected.

The rotating shaft (1a) of the first rotating body (1) and the rotating shaft (2a) of the second rotating body (2) are connected to the rotating bodies (1) and (2) at different rotational speeds (v ₁ ) and (v ₂ ). ), So that the rotating shafts (1) and (2) are rotated independently of each other, and the rotational speed (v ₁ ) of the former rotating body (1) is changed to the latter rotating body. It is set smaller (v ₁ <v ₂ ) than the rotation speed (v ₂ ) of ( ₂ ) (practically, v ₁ / v ₂ =
(Within the range of 0.3 to 0.7).

That is, according to the above-mentioned rotation speed setting, each of the adsorption time in the adsorption zone (A ₁ ) of the former rotating body (1) and the desorption time in the desorption area (B ₁ ) is longer than that of the latter rotating body (2). Thus, the adsorption / desorption efficiency of the pre-rotator (1) with respect to the difficult-to-desorb material, which is quantitatively less than the substance to be adsorbed having an average molecular diameter and has a low adsorption efficiency, and also inherently has a low desorption efficiency. I try to improve it.

In forming the two rotating bodies (1) and (2), the former rotating body (1) is more rotated than the latter rotating body (2) by the rotation axis (P).
Formed in the direction of small thickness (l ₁ <l ₂ ) (practically l ₁
/ L ₂ = 0.3-0.7), which gives
The regenerating gas (H) is desorbed by reducing the temperature drop from the inlet to the outlet of the regenerating gas (H) in the desorption zone (B ₁ ) of the former rotating body (1) as compared with the latter rotating body (2). By maintaining the temperature at a high temperature up to the region outlet, it is possible to further promote the desorption of the difficult-to-desorb material that is inherently difficult to desorb compared to the substance to be adsorbed having the average molecular diameter in the former rotating body (1). .

It should be noted that hard-to-desorb substances such as high-boiling solvents are easily adsorbed and the adsorption band may be short, and the amount of hard-to-desorb substances is smaller than that of the substance to be adsorbed having an average molecular diameter. (1)
Even if the thickness (l ₁ ) is small, it does not saturate in the rotating body within the adsorption time during one rotation, is almost completely collected by the former rotating body (1), and flows out to the latter rotating body (2) I will not do it.

Similarly, in the present embodiment, for the purpose of further improving the efficiency of desorption of the hardly desorbable substance in the pre-rotating body ( ₁ ), the regeneration gas (supplied to the desorption region (B ₁ ) of the pre-rotating body (1)) H) (t ₁ ) is set to be higher than the temperature (t ₂ ) of the regeneration gas (H) supplied to the desorption zone (B ₂ ) of the post-rotating body (2) (for example, t ₁ = 150 ° C.). (T ₂ = 130 ° C.).

(Another embodiment)

 Next, another embodiment of the present invention will be described.

(A) The structure of the rotating bodies (1) and (2) The fine activated carbon is not limited to a fibrous one, and may be granular. In order to configure the rotating bodies (1) and (2) that can ventilate in the P) direction, a formation structure other than forming the fine activated carbon into a honeycomb structure may be employed.

(C) The number of the rotating bodies (1) and (2) may be three or more, and in that case, how many rotating bodies on the upstream side in the series of gas passages (GF) to be treated. May be appropriately determined as the pre-rotating body (1) for absorbing and desorbing the hardly-removable substance.

(D) Adsorption area (A ₁ ), (A ₂ ) of each rotating body (1), ( ₂ )
Of gas to be treated (G
Various configuration changes are possible for the specific formation structure of F).

(E) Each rotating body (1), (2) each desorption area (B ₁ ),
(G ₂ ) through which the regeneration gas (H) flows
Instead of using a series of air paths as in the above embodiment, F ₁ ) and (HF ₂ ) may be independent air paths as shown in FIG. 3, for example. HF ₁ ), (H
Various structural changes are also possible for the specific formation structure of F ₂ ).

(F) Various gases such as air can be applied to the regeneration gas (H). In particular, it is intended to prevent the difficult-to-desorb material in the former rotating body (1) from becoming more difficult due to oxidative deterioration. An inert gas may be applied to the regeneration gas (H) for the pre-rotating body (1) in order to improve the efficiency of desorption of the hardly desorbable substance in the pre-rotating body (1).

(G) In order to promote the desorption of the hardly-desorbable substance in the first-stage rotator (1), the supply amount of the regeneration gas to the first-stage rotator (1) is made larger than the supply amount of the regeneration gas to the second-stage rotator (2). Is also good.

(H) In order to make the fine activated carbon constituting the former rotating body (1) larger in average pore diameter than the fine activated carbon constituting the latter rotating body (2), the former and latter rotating bodies (1) and (2) respectively The specific average pore diameter of the fine activated carbon may be appropriately determined according to the hardly desorbable substance to be adsorbed and desorbed and the substance to be adsorbed having an average molecular diameter.

(I) front rotator speed (v ₁₎ and the subsequent rotation of (1) and the rotation speed of (2) (v _2), when making them different speeds, and, if the same velocity In any case, it may be appropriately determined in consideration of the adsorption / desorption efficiency and the like.

(J) The rotational axis (P) direction of the thickness of the rotational axis (P) direction of the thickness of the front rotary member ₍₁₎ (l 1) and the subsequent rotating body ₍₂₎ (l 2), them together Regardless of whether the thickness is different or the same thickness, the thickness may be appropriately determined in consideration of the adsorption / desorption efficiency, the air passage pressure loss, and the like.

(K) The present invention is applicable not only to the exhaust from the coating booth but also to the treatment of various gases in various fields.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view showing a schematic apparatus configuration, and FIG. 2 is a longitudinal sectional view. FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention. (1) ... front stage rotating body, (2) ... rear stage rotating body,
(A ₁ ), (A ₂ ): adsorption area, (B ₁ ), (B ₂ ): desorption area, (GF): gas passage to be treated, (HF ₁ ), (HF ₂ )
(G) gas to be treated, (H) regeneration gas, (d) ... average pore diameter, (v) ... rotation speed,
(L): thickness, (P): rotation axis.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuyuki Kawada 2-1-1 Katata, Otsu City, Shiga Prefecture Inside Toyo Spinning Co., Ltd. (72) Inventor Yoshihiko Matsumoto 2-chome Dojimahama, Kita-ku Osaka City No. 2-8 Toyobo Co., Ltd. Head Office (72) Inventor Yasuyuki Kawai 2-1-1 Katata, Otsu-shi, Shiga Prefecture Toyobo Co., Ltd. Research Laboratory (56) References JP-A-58-61817 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) B01D 53/06, 53/34

Claims (4)

(57) [Claims] 1. A plurality of rotating bodies (1), (2) each having fine activated carbon as a main constituent material and capable of being ventilated in the direction of a rotation axis (P).
And an adsorbing zone (A ₁ ) through which the gas to be treated (G) passes, in each of the rotating bodies (1) and (2).
(A ₂ ) and the desorption zone (B ₁ ) through which the regeneration gas (H) passes,
(B ₂ ), and the adsorbing regions (A ₁ ) and (A ₂ ) of the rotating bodies (1) and (2) are arranged in a series of gas passages to be treated (GF) in the direction of the passage. And the rotating body (1),
(2) A rotary gas processing apparatus in which the desorption areas (B ₁ ) and (B ₂ ) are disposed in regeneration gas air paths (HF ₁ ) and (HF ₂ ), respectively. In (2), the fine activated carbon constituting the upstream rotating body (1) located on the upstream side in the gas flow path to be treated (GF) is more average than the fine activated carbon constituting the downstream rotating body (2) located on the downstream side. A rotary gas processing apparatus having a large pore diameter (d). 2. The average fine pore diameter (d ₁ ) of the fine activated carbon constituting the first rotating body (1) is 1.1 times the average fine pore diameter (d ₂ ) of the fine activated carbon constituting the second rotating body (2). 2. The rotary gas processing apparatus according to claim 1, wherein the angle is equal to or less than 35 °. 3. The rotary gas processing according to claim 1, wherein a rotation speed (v ₁ ) of the first-stage rotator (1) is smaller than a rotation speed (v ₂ ) of the second-stage rotator (2). apparatus. 4. The rotating device according to claim 1, wherein said first rotating body (1) has a smaller thickness (l) in a direction of a rotation axis (P) than said second rotating body (2). Gas processing equipment.