JP4772197B2 - Gas adsorption concentrator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas adsorption concentrator used for removing organic solvent vapor, for example.
[0002]
[Prior art]
Currently, organic solvent vapor is generated from many factories. For example, toluene, xylene, and the like are generated from a painting factory, and most of them are released into the atmosphere. Also, dimethyl sulfoxide (DMSO) is generated from semiconductor factories.
[0003]
Since such organic solvent vapors are harmful when released into the atmosphere, various removal means have been proposed. One of the removing means uses a honeycomb rotor carrying an adsorbent. In other words, there is a ceramic sheet or the like that corrugates to form a honeycomb body that uses an adsorption rotor carrying an adsorbent such as hydrophobic zeolite.
[0004]
Since toluene, xylene, and the like have a low boiling point among the above vapors, these substances adsorbed on the adsorption rotor can be easily desorbed by passing desorption air at about 140 to 180 ° C. through the adsorption rotor. The organic solvent vapor desorbed in this manner can be rendered harmless by passing through a catalyst or a combustion device and released to the atmosphere.
[0005]
[Problems to be solved by the invention]
However, complete desorption of organic solvents having a high boiling point such as DMSO is difficult unless the temperature of the desorption air is increased to 200 ° C. or higher. However, when the temperature of the desorption air is increased, there is a problem that the sealing material that maintains the airtightness between the adsorption zone and the desorption zone is damaged by the organic solvent having a high temperature.
[0006]
In other words, the sealing material needs to be in close contact with the adsorption rotor from the viewpoint of maintaining hermeticity, and it must be a material that is not attacked by organic solvent vapor. Have been used. However, fluororubber cannot withstand organic solvent vapor at a temperature of 200 ° C.
[0007]
On the other hand, a fluororesin can withstand organic solvent vapor at a temperature of 200 ° C. or higher, but is not preferable from the viewpoint of low elasticity and airtightness. The present invention is intended to solve such problems and to provide a gas adsorption concentrator capable of processing even a vapor of an organic solvent having a high boiling point.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a dividing means for dividing the gas adsorption rotor into an adsorption zone and a desorption zone, and a heat resistant seal made of a high heat resistant material is provided on the desorption zone side of the dividing means. A highly elastic airtight seal is provided outside the heat resistant seal.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention has a honeycomb-like gas adsorption rotor, and a dividing means for dividing the gas adsorption rotor into an adsorption zone and a desorption zone, and a high heat resistant material is provided on the desorption zone side of the dividing means. The heat-resistant seal made in (1) is provided, and a highly elastic air-tight seal is provided outside the heat-resistant seal, and the heat-resistant seal has the effect of preventing the high temperature organic solvent vapor from being transmitted to the air-tight seal.
[0010]
【Example】
Embodiments of the gas adsorption concentration apparatus of the present invention will be described in detail below with reference to the drawings. In FIG. 2, reference numeral 1 denotes a gas adsorption rotor, and the gas adsorption rotor 1 is rotatably housed in a casing 2. The gas adsorption rotor 1 is rotationally driven in the direction of the arrow in FIG. 2 by a geared motor (not shown) provided in the casing 2.
[0011]
Reference numeral 3 denotes a zone frame, which divides the gas adsorption rotor 1 into an adsorption zone 4, a purge zone 5, and a desorption zone 6. Sealing means for preventing gas leakage between the zones is provided on the side of the zone constituting frame 3 facing the gas adsorption rotor 1. This sealing means will be described below.
[0012]
FIG. 1 is an enlarged cross-sectional view taken along the line AA in FIG. Reference numeral 7 denotes an airtight seal having a semicircular cross-sectional shape. The hermetic seal 7 is made of fluoro rubber having elasticity and high hermeticity. Further, the top of the hermetic seal 7 is in contact with the surface of the gas adsorption rotor 1 with some pressure.
[0013]
Reference numeral 8 denotes a heat-resistant seal, which is made of a fluororesin such as Teflon (trade name of DuPont, USA) and has high resistance to high-temperature organic solvent vapor. The heat-resistant seal 8 has a shape having three plates perpendicular to the surface of the gas adsorption rotor 1. The tip of this heat-resistant seal 8 is also in contact with the surface of the gas adsorption rotor 1.
[0014]
The heat-resistant seal 8 is disposed so as to be located on the desorption zone 6 side. That is, the hermetic seal 7 and the heat-resistant seal 8 are attached to the zone frame 3 in a state where they are arranged side by side. The heat-resistant seal 8 is located inside the portion surrounding the desorption zone 6 and the air-tight seal 7 is located outside the part. ing.
[0015]
FIG. 4 shows the overall configuration of the gas adsorption concentrator. Reference numeral 9 denotes a processing fan that sends to-be-treated air containing an organic solvent vapor to the adsorption zone 4. Reference numeral 10 denotes a desorption fan which sucks in air containing organic solvent vapor concentrated from the desorption zone 6. Reference numeral 11 denotes a heater, and an air supply line is configured so that air that has passed through the purge zone 5 is sent to the desorption zone 6 via the heater 11.
[0016]
The gas adsorption concentrator of the present invention is configured as described above, and its operation will be described below. First, the processing fan 9 and the desorption fan 10 are started, and then the gas adsorption rotor 1 is rotated in the direction of the arrow in FIG. Then, the heater 11 is operated.
[0017]
Then, for example, the air to be treated containing the organic solvent vapor having a concentration of 100 ppm is sent to the adsorption zone 4, where the organic solvent vapor in the air is adsorbed by the gas adsorption rotor 1 and becomes clean air having an organic solvent vapor concentration of about 2 ppm. Released into the atmosphere.
[0018]
The portion of the gas adsorption rotor 1 that has adsorbed the organic solvent vapor in the adsorption zone 4 moves to the desorption zone 6 as it rotates. Then, since the air heated to 250 to 280 ° C. by the heater 11 is sent to the desorption zone 6, the adsorbed organic solvent vapor is desorbed from the gas adsorption rotor 1 and sucked out from the desorption zone 6 by the desorption fan 10. , And sent to a detoxifying means such as a combustion device (not shown). If the desorbed organic solvent vapor is 10 times concentrated, the concentration becomes 1000 ppm.
[0019]
The portion of the gas adsorption rotor 1 that has passed through the desorption zone 6 moves to the purge zone 5 as it rotates. The gas adsorption rotor 1 is heated in the desorption zone 6 and enters the purge zone 5 in a high temperature state. The gas adsorption rotor 1 is cooled in the purge zone 5, and conversely, the air passing through the purge zone 5 is heated.
[0020]
The above is a series of organic solvent vapor concentration processes, which will be described in detail. First, since the desorption fan 10 is configured to suck the air in the desorption zone 6, the desorption zone 6 has a negative pressure. Then, when an air leak occurs in the hermetic seal 7, the leaked air that has passed through the hermetic seal 7 and the heat-resistant seal 8 enters the desorption zone 6 from the purge zone 5 or the adsorption zone 4 as shown in FIG. That is, since the air passing through the desorption zone 6 does not leak to the outside, the concentrated organic solvent vapor does not leak to the outside.
[0021]
Since the air passing through the heater 11 flows at the entrance of the desorption zone 6, the temperature here is the highest. Specifically, the temperature of the air flowing to the desorption zone 6 is about 250 to 280 ° C. as described above. On the other hand, the temperature of the air at the outlet of the purge zone 5 is at most about 150 to 180 ° C. Accordingly, the leaked air flows from the low temperature zone, that is, the adsorption zone 4 and the purge zone 5 to the high temperature desorption zone 6.
[0022]
Therefore, when leaked air is generated, air having a low temperature flows between the hermetic seal 7 and the gas adsorption rotor 1, and air having a low temperature contacts the hermetic seal 7.
[0023]
When no leakage air is generated, one surface of the hermetic seal 7 comes into contact with the air in the purge zone 5 or the adsorption zone 4 having a low temperature, and the other surface of the hermetic seal 7 comes into contact with air between the heat-resistant seal 8. The air between the heat-resistant seal 8 and the airtight seal 7 is naturally lower than the temperature of the desorption air, and the airtight seal 7 is always in contact with the air having a low temperature. On the other hand, the heat-resistant seal 8 is in contact with high-temperature desorption air, but the heat-resistant seal 8 is made of a material having high heat resistance and solvent resistance such as fluororesin and is not damaged by the high temperature organic solvent vapor.
[0024]
In this way, by using a highly elastic material as the airtight seal 7 and using a material that can withstand high temperature organic solvent vapor as the heat resistant seal 8, a highly heat resistant seal can be obtained while maintaining airtightness. The temperature of the air can be increased.
[0025]
In other words, although the concentration of the organic solvent vapor is low at the entrance of the desorption zone 6, the air heated to 250 to 280 ° C. immediately after passing through the heater 11 is in contact with it, which is a very severe condition as a sealing means. Although the temperature of the outlet is lowered, the concentration of the organic solvent vapor is increased by the concentration factor, so this is also an extremely severe condition as a sealing means. However, as described above, the hermetic seal 7 has a high temperature at the entrance of the direct desorption zone 6. Since it does not touch the air or the desorption zone 6 outlet air, it is not damaged by the organic solvent vapor.
[0026]
In addition, when leaked air is generated, air flows in the gap between the surface of the gas adsorption rotor 1 and the three heat resistant seals 8 as shown in FIG. Since the air resistance increases, the amount of leakage air decreases.
[0027]
In the above embodiment, the purge zone 5 is provided. However, in some cases, the purge zone 5 is not provided, and only the desorption zone 6 and the adsorption zone 4 may be provided. Further, although the three plate-like bodies are configured to contact the surface of the gas adsorption rotor perpendicularly as the heat-resistant seal, the heat-resistant seal may be constituted by one or two plate-like bodies when there is little air leakage. In the case of two sheets, vortices are generated between the two plates and between the heat-resistant seal and the hermetic seal as air leaks. In the case of one sheet, a vortex is generated between the heat-resistant seal and the hermetic seal as air leaks. The number of plate-like bodies may be three or more.
[0028]
【The invention's effect】
Since the gas adsorption concentrator of the present invention is configured by combining the hermetic seal and the heat-resistant seal as described above, since the hermetic seal is not directly exposed to the desorption air containing the high temperature organic solvent vapor, the high temperature desorption air is supplied to the desorption zone. Even if it is the vapor | steam of an organic solvent with a high boiling point which can be flowed, a concentration process can be performed.
[0029]
In addition, since the hermetic seal is made of a highly elastic material and the heat-resistant seal is made of a highly heat-resistant material, a synergistic effect of both features can be obtained, and heat resistance can be enhanced while maintaining airtightness.
[0030]
Furthermore, in the gas adsorption concentrator of the present invention, a heat-resistant seal is arranged on the desorption zone side of the dividing means for dividing the zone, an airtight seal is arranged on the anti-desorption zone side, and the desorption zone is set to a negative pressure. However, the airtight seal is not exposed to high-temperature air, and the airtight seal can be prevented from being damaged by heat.
[Brief description of the drawings]
FIG. 1 is a partially enlarged cross-sectional view showing a first embodiment of a gas adsorption concentration apparatus of the present invention.
FIG. 2 is a perspective view showing an example of a gas adsorption concentration apparatus used in the present invention.
3 is a further enlarged cross-sectional view of FIG. 1. FIG.
FIG. 4 is a flowchart showing an example of a gas adsorption concentration apparatus used in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gas adsorption | suction rotor 2 Casing 3 Zone structure frame 4 Adsorption zone 5 Purge zone 6 Desorption zone 7 Airtight seal 8 Heat-resistant seal 9 Processing fan 10 Desorption fan 11 Heater

Claims (4)

A honeycomb-shaped gas adsorption rotor, and a dividing unit that divides the gas adsorption rotor into an adsorption zone and a desorption zone, and is made of a high heat-resistant material on the desorption zone side of the division unit and is perpendicular to the adsorption rotor. a plurality of provided shaped heat sealing plate, said refractory sealing the heat seal and separate high rather gas adsorption concentration device provided with a hermetic seal for repression in the gas adsorption rotor surface elasticity of the outside of that. The gas adsorption concentration apparatus according to claim 1, wherein a fluororesin is used as the heat-resistant seal. The gas adsorption concentration apparatus according to claim 1, wherein fluororubber is used as an airtight seal. The gas adsorption concentration apparatus according to claim 1, wherein the desorption zone has a negative pressure.

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