JP2015182051A - Rotary gas adsorption concentration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary gas adsorption concentration device which has solvent resistance, can use desorption air of high temperature of around 300°C and further can prevent leakage of the desorption air of such a high temperature by assembling relatively inexpensive materials in a simple structure.SOLUTION: A rotary gas adsorption concentration device has a honeycomb rotor which is rotatively driven and carries an adsorbent, and is divided into at least a desorption zone and an adsorption zone. Therein, a seal of an arcuate part of the honeycomb rotor has such a structure that a heat-resistant and solvent-resistant sheet 8 which is provided with a plurality of slits and has a sliding property and a sheet 9 having stretched rubber elasticity which is stacked on the sheet 8 are attached onto a rotor outer circumferential iron plate 2 in pile with a metal band 10 and are pressed against a seal flange 4 of casing. A part and all of the sheet 8 are made of glass fiber cloth-containing fluororesin sheet.

Description

The present invention relates to a rotary gas adsorption concentrator, and particularly requires a desorption temperature higher than the heat resistance temperature of the rubber material, even if it is a volatile organic compound (hereinafter referred to as VOC) that corrodes the rubber material. Even with a gas containing VOC, a relatively simple structure and an inexpensive material are used to realize a highly durable adsorption concentrator sealing device.

The rotary gas adsorption concentrator is used for the concentration of VOCs in the air. In other words, a large amount of VOC, which is a solvent for paints and inks, is released from paint factories and printing factories. In order to recover or burn these VOCs and make them harmless, it is easy to recover VOCs or self-combustion. It is necessary to concentrate to the concentration to achieve.

For this purpose, rotary gas adsorption concentrators using a honeycomb (honeycomb) rotor carrying an adsorbent are used. The rotary gas adsorption concentrator uses the honeycomb rotor carrying the adsorbent as described above, and divides the honeycomb rotor into at least an adsorption zone and a desorption zone, and the air to be treated containing VOC flows through the adsorption zone. In the desorption zone, high-temperature desorption air is allowed to flow in order to desorb the VOC adsorbed by the honeycomb rotor.

The seal of such a rotary gas adsorption concentrator uses heat-resistant silicone rubber or fluorine-based rubber material that has elasticity in order to follow the outer periphery of the rotor. An example of such a technique is disclosed in Patent Document 1.

Further, what is disclosed in Patent Document 2 is a seal of a rotary heat exchanger, but the outer peripheral portion of the honeycomb-shaped rotor is provided with a seal material having a low friction coefficient such as rubber or resin, and the pressure in the heat exchanger Even if there is a change, it prevents leakage. (Fig. 2 etc.)

JP-A-3-248837 JP 2006-52922 A Japanese Patent No. 3570621

The one disclosed in Patent Document 1 has a structure in which a fluorocarbon rubber seal such as vinylidene fluoride (FKM) is used and a fluororesin sheet for improving slidability is attached. With this structure, a seal having high sealing performance, rotational followability, and heat resistance is possible.

However, there are many types of VOCs that require treatment, and depending on the type and concentration of VOC, there is a problem that these rubber materials swell or dissolve, thereby reducing durability. Highly solvent-resistant tetrafluoroethylene perfluoromethyl vinyl ether rubber (FFKM) and the like have been developed, but they are very expensive, have high sliding resistance, and have difficulty in durability due to friction with the rotor end face. Therefore, a seal for a VOC processing apparatus that is cheaper and has higher solvent resistance than fluorine-based rubber has been demanded. The one described in Patent Document 1 has high sealing performance, rotational follow-up performance, and heat resistance by bonding a fluororubber sponge and a fluororesin sheet, but the solvent resistance of fluororubber is weak, and MEK. There is a problem that it cannot be used for solvents such as NMP or that the service life is greatly reduced.

Although what was disclosed by patent document 2 has high sealing performance even if there is a pressure change in the heat exchanger, the heat resistance and solvent resistance necessary for the sealing material of the rotary gas adsorption concentrating device, No technique related to wear resistance is disclosed.

The one disclosed in Patent Document 3 is one in which a graphite-based material is attached to an attachment member and pressed against a rotor end surface using a spring to perform sliding sealing, and has heat resistance, sliding resistance, and solvent resistance. However, since the material is expensive and the structure is complicated, it must be expensive.

The present invention is a metal sheet such as stainless steel, copper, brass or the like, a glass cloth-containing fluororesin sheet, a polyimide film, a sheet having heat resistance, slidability and solvent resistance, a rubber elastic seal, and heat resistance if necessary. This is a general and relatively inexpensive material that can be used for VOC processing that contains components that attack rubber-based materials, and has a heat resistance of about 300 degrees Celsius. It is also possible to regenerate using a high temperature desorption air, and to provide a rotary gas adsorption concentrating device capable of preventing leakage of the high temperature desorption air.

In order to solve the above-mentioned problems, the present invention has a honeycomb-shaped rotor that is rotationally driven and carries an adsorbent, and has a slidable heat resistance and solvent resistance as a seal for an arc portion on the outer periphery of the honeycomb-shaped rotor. The sheet has a plurality of slits in the sliding portion, and a rubber elastic sheet is stretched on top of the sheet and attached to the seal flange (or outer peripheral portion of the rotor) of the casing. A seal that slides against the portion (or the seal flange portion of the casing) was provided.

Since the rotary gas adsorption concentrator of the present invention is configured as described above, the rubber elastic seal does not directly touch the gas to be treated and is not deteriorated by the solvent. Further, in the regeneration zone, the rubber elastic seal is not in direct contact with the high-temperature gas and is in a heat radiation environment on the outer periphery side of the regeneration zone, so that it is kept at a lower temperature than the inside of the regeneration zone to prevent thermal deterioration. The solvent-resistant sheet with slidability is poor in sealing properties because it does not have stretchability, but it has a slit on the sliding surface to improve adhesion, and it is stretched and stacked with a rubber elastic seal, and pressed against the sealing surface. Leakage can be completely stopped.

For this reason, the gas which corrodes a rubber material and the gas containing a high boiling point VOC can be adsorbed and concentrated, and a harmful gas can be treated even under conditions where the conventional treatment is difficult.

The heat-resistant and solvent-resistant sheet may be any material as long as it has a higher heat resistance than a rubber-elastic seal and can withstand the desorption temperature. Therefore, an inexpensive material can be used.

It is sectional drawing which shows Example 1 of the outer periphery seal | sticker used for this invention. It is sectional drawing which shows Example 2 of the outer periphery seal | sticker used for this invention. It is sectional drawing which shows Example 3 of the outer periphery seal | sticker used for this invention. It is a perspective view which shows the Example of the rotary gas adsorption concentration apparatus of this invention. It is sectional drawing which shows an example of the outer periphery seal used conventionally.

The invention according to claim 1 of the present invention is a rotary gas adsorption and concentrating apparatus that has a honeycomb-shaped rotor that is rotationally driven and carries an adsorbent, and divides the honeycomb-shaped rotor into at least a desorption zone and an adsorption zone. As a seal for the arc portion of the outer periphery of the honeycomb-shaped rotor, a heat-resistant and solvent-resistant sheet having slidability, the sheet has a plurality of slits, and a sheet having rubber elasticity stretched thereon is stacked. A seal was attached to the outer periphery of the seal flange or rotor of the casing, and a seal that was pressed against the outer periphery of the rotor or flange and slid. The gas contact part is a slidable heat-resistant and solvent-resistant sheet, so it is not affected by thermal degradation or solvent, and a rubber elastic seal stretched around its outer circumference is pressed against the sealing surface to seal it. Is preserved. The elastic seal is provided outside the desorption zone from the heat and solvent resistant sheet, and the high temperature desorption air is almost sealed by the heat and solvent resistant sheet, and the slightly desorbed desorption air is completely removed by the rubber elastic seal. It has the effect | action that it can seal.

Embodiments of the rotary gas adsorption concentrator of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of a seal of the rotary gas adsorption and concentrating device of the present invention and its mounting portion.

Here, 8 is a heat-resistant and solvent-resistant sheet having slidability, covering the rotor outer peripheral iron plate 2 and the outer periphery of the flange, and a metal band 10 on the flange 4 extending from the casing with a rubber elastic seal 9 extended thereon. It is fixed with. The heat-resistant and solvent-resistant sheet 8 having slidability is inferior in sealing performance because it does not have stretchability. However, a slit is provided in the rotor sliding portion to improve adhesion, and the elastic rubber seal 9 is pressed against the sliding surface. Can completely stop leakage. The slidable heat-resistant and solvent-resistant sheet 8 is made of a fluororesin, a thin metal plate such as copper, brass, or stainless steel having heat resistance and elasticity of about 300 ° C. or higher, heat-resistant film, heat-resistant fiber, and metal fiber sheet. It can also be used. The fluororesin may be a fluororesin sheet, or may be a glass-filled fluororesin sheet to increase the strength. The width of the rubber elastic seal 9 is 5 to 20 mm wider than that of the heat and solvent resistant seal 8 so that it protrudes beyond the heat and solvent resistant seal 8 so as to cover the rotor outer peripheral iron plate 2 and the flange outer periphery. A stopping effect can be obtained.

FIG. 2 is a sectional view of a mounting portion showing another embodiment of the rotary gas adsorption concentrator seal of the present invention.

Here, reference numeral 8 denotes a heat-resistant and solvent-resistant sheet having slidability, which covers the rotor outer peripheral iron plate 2 and the outer periphery of the flange. A rubber elastic seal 9 extended from above is overlaid on the rotor outer peripheral iron plate 2 with a metal band 10. It is fixed. The heat-resistant and solvent-resistant sheet 8 having slidability is inferior in sealing performance because it does not have stretchability. However, a slit is provided in the sliding portion of the casing flange to improve adhesion, and an extended rubber elastic seal 9 is applied to the sliding surface. Leakage can be completely stopped by being pressed. In addition, in order to improve sealing performance, including Example 1, a plurality of heat-resistant and solvent-resistant sheets may be stacked with the slit positions shifted. In the case of the first embodiment, when replacing the sliding sheet and the rubber elastic seal, the replacement work cannot be performed unless two or more of the side surfaces of the rotor casing can be released. However, in the second embodiment, only one surface is opened while rotating the rotor. It has the feature that exchange work becomes possible.

FIG. 3 is a sectional view of a mounting portion showing another embodiment of the rotary gas adsorption concentrator seal of the present invention.

Here, 8 is a heat-resistant and solvent-resistant sheet having slidability, covering the rotor outer peripheral iron plate 2 and the outer periphery of the flange, covered with a heat-insulating sheet 11 having heat resistance thereon, and further stretched from the rubber elastic seal 9 are stacked and fixed to the rotor outer peripheral iron plate 2 with a metal band 10. The heat-resistant and solvent-resistant sheet 8 having slidability is poor in sealability because it does not have stretchability, but it has a slit in the sliding portion of the casing flange to improve adhesion, and is covered with a heat-insulating sheet 11 having heat resistance. Leakage can be completely stopped by being pressed against the sliding surface by the rubber elastic seal 9 extending above. Since the heat-insulating sheet 11 having heat resistance is inserted between the heat-resistant and solvent-resistant sheet 8 having slidability and the rubber elastic seal 9, heat conduction to the rubber elastic seal 9 is prevented and the heat of the rubber elastic seal 9 is prevented. Deterioration is prevented, so that high heat resistance, durability and sealing properties can be achieved at the same time. Although it is desirable that the heat resistant solvent resistant seal 8 and the heat insulating sheet 11 have the same width, the rubber elastic seal 9 is 5 to 20 mm wider than the heat resistant solvent resistant seal 8 so that the heat insulating sheet 11 and the heat resistant sheet 11 are heat resistant. A further leak-proof effect can be obtained by protruding beyond the solvent-based seal 8 and covering the rotor outer peripheral iron plate 2 and the flange outer periphery.

The width of the rubber elastic seal 9 is 5 to 20 mm wider than that of the heat and solvent resistant seal 8 because the width of the rubber elastic seal 9 is larger than that of the heat and solvent resistant seal 8. The width is widened by 10 to 40 times the thickness, and the width of the rubber elastic seal is not larger than the dimension in which the tip of the rubber elastic seal is in contact with the rotor outer peripheral iron plate 2 and increases in sliding resistance due to being too long.

The rotary gas adsorbing device is sealed by the outer peripheral sealing device and divides the adsorption zone 15 and the desorption zone 14 of the honeycomb-shaped rotor 13 as shown in FIG. 4, and forms a pair of V-shaped straight shapes. The desorption zone 14 is surrounded by the separators 16 and 17 and the arc-shaped separator 18. As is generally known, the honeycomb-shaped rotor 13 is formed by forming an inorganic paper in a honeycomb shape and carrying an adsorbent such as hydrophobic zeolite, and is rotated by a geared motor (not shown) or the like. The

The heat-resistant and solvent-resistant sheet 8 having slidability is in contact with the rotor outer peripheral iron plate 2 in Example 1 and in contact with the iron plate of the flange 4 in Example 2, but both are in contact with a smooth metal surface. It is characterized by low friction loss during rotor rotation and low wear due to rotation. Further, since the rubber elastic seal 9 extending around the outer periphery of the heat-resistant and solvent-resistant sheet 8 is covered, the sealing performance is maintained, and even when a part of the heat-resistant and solvent-resistant sheet 8 is worn, the rubber elastic seal 9 is worn out. Sealing performance is maintained.

The rotary gas adsorption concentrator of the present invention having such a configuration sends the air to be treated to the adsorption zone 15 of the honeycomb rotor 13 while rotating the honeycomb rotor 13. Here, the VOC contained in the air to be treated is adsorbed by the adsorbent of the honeycomb-shaped rotor 13. Then, desorption air at about 180 ° C., for example, is sent to the desorption zone 14 to desorb the VOC adsorbed by the adsorbent.

When the amount of the desorption air is reduced to 1/10 of the amount of the air to be treated, the VOC concentration in the desorption air is concentrated to 10 times the concentration of the air to be treated. For this reason, the desorbed air having a high concentration can be easily treated with combustion, a catalyst, or the like, and the processing device for combustion, the catalyst, etc. can be downsized by reducing the air volume.

When VOC having a high boiling point is included in the VOC contained in the air to be treated, the desorption air at about 180 ° C. is not sufficiently desorbed, and VOC accumulates in the honeycomb rotor 13. In this case, for example, a high-temperature air of about 300 ° C. may be periodically sent to the desorption zone 14 by a timer to perform the activation treatment of the honeycomb-shaped rotor 13, and the desorption is always performed with high-temperature air of about 300 ° C. You may do it.

For the seal having rubber elasticity, rubber such as fluorine rubber or silicone rubber can be used. The heat-resistant temperature of fluorine-based rubber and silicone-based rubber is around 200 to 250 ° C., but the portion that is in contact with the high temperature gas is covered with a sheet having heat and solvent resistance, and the outer surface of the rubber elastic seal is in contact with the outside air. Therefore, the heat resistance does not exceed the heat resistance temperature of the rubber-based material, and thermal deterioration is prevented and long-term durability is ensured. Furthermore, when used at a higher gas temperature, the rubber elastic seal is insulated and protected by stacking a heat resistant heat insulating sheet between the rubber elastic seal and the heat and solvent resistant sheet. Thermal degradation can be prevented. As the heat-insulating sheet having heat resistance, a cross sheet of inorganic fibers such as glass fibers, ceramic fibers, and biosoluble fibers can be used.

FIG. 5 is a cross-sectional view of a peripheral seal and a mounting portion of a conventional rotary gas adsorption concentrator. The seal retainer 6 and the bolt are attached to the flange 4 extending from the casing so that the seal material 5 such as fluorine rubber or silicone rubber contacts the L-shaped angle flange 3 attached to the rotor outer peripheral iron plate 2 in contact with the C-shape. 7 is fixed. Therefore, the casing size is increased by the angle flange 3. If a rotor without an angle flange is to be used, it is necessary to increase the rotor diameter by the letter C of the seal 5, and in either case, the cost increases compared to the embodiment of the present invention.

The leak amount was tested with a rotary gas adsorption concentrator leak tester using a pseudo rotor with an outer diameter of 1200 mm. In the conventional outer peripheral seal shown in FIG. 5, the leak amount was 95 L / min when the pressure in the apparatus was minus 0.5 kPa, and the leak amount was 157 L / min at the same minus 1.0 kPa. When the pressure in the apparatus was minus 0.5 kPa, the leak amount was 77 L / min, and when the minus pressure was minus 1.0 kPa, the leak amount was 109 L / min. In Example 2, the leak amount was 68 L / min when the pressure in the apparatus was minus 0.5 kPa, and the leak amount was 91 L / min when the pressure was minus 1.0 kPa. Further, when the starting load at the start of the rotor rotation is compared at a pressure in the apparatus of minus 1.0 kPa, the conventional outer peripheral seal shown in FIG. / 4. The load on the geared motor that rotationally drives the rotor can also be reduced, and a geared motor with a lower motor capacity can be adopted, leading to cost reduction.

As described above, by adopting the seal of the present invention, it has a simple structure using a relatively inexpensive material, and at the same time has heat resistance, solvent resistance, slidability, and wear resistance that are impossible with conventional seals. A rotary gas adsorption concentrator having high sealing performance can be realized.

The present invention has a relatively simple structure, even if it is a volatile organic compound that corrodes a rubber material, or a gas containing VOC that requires a desorption temperature higher than the heat resistance temperature of the rubber material. A rotary gas adsorption / concentration device capable of realizing a highly durable adsorption / concentration device sealing device using an inexpensive material and capable of adsorption / concentration even for a VOC containing a high-boiling point substance. .

DESCRIPTION OF SYMBOLS 1 Honeycomb-shaped rotor element 2 Rotor outer peripheral iron plate 3 Angle flange 4 Flange 5 Sealing material 6 Seal pressing metal fitting 7 Bolt 8 Heat-resistant solvent-resistant sheet 9 Rubber elastic seal 10 Metal band 11 Heat insulation sheet 13 Honeycomb-shaped rotor 14 Desorption zone 15 Adsorption zone 16 Straight separator 17 Straight separator 18 Arc-shaped separator

Claims (4)

A sheet-shaped sheet having a slidable, solvent-resistant, and heat-resistant sheet as a seal for the arcuate part of the honeycomb-shaped rotor having a honeycomb-shaped rotor that is driven to rotate and carries an adsorbent. A rotary gas adsorption and concentrating apparatus provided with a seal that stretches and overlaps a sheet having rubber elasticity thereon, is attached to a seal flange of the casing, and is pressed against and slides on the outer peripheral portion of the rotor. A sheet-shaped sheet having a slidable, solvent-resistant, and heat-resistant sheet as a seal for the arcuate part of the honeycomb-shaped rotor having a honeycomb-shaped rotor that is driven to rotate and carries an adsorbent. A rotary gas adsorption and concentrating apparatus provided with a seal that stretches and overlaps a sheet having rubber elasticity and is attached to the outer periphery of the rotor and pressed against the outer peripheral portion of the seal flange of the casing. A rotary gas adsorption and concentrating apparatus provided with a seal, wherein a heat-resistant sheet having heat resistance is provided between a solvent-resistant sheet having sliding properties and a seal having rubber elasticity. 3. A rotary gas adsorption and concentrating device according to claim 1, wherein a part of and all of the solvent-resistant and heat-resistant sheet having sliding properties are made of glass fiber cloth-containing fluororesin sheets.

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