JP2012061389A - Adsorption/desorption type concentration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adsorption/desorption type concentration device for achieving high concentration rate while securing recovery efficiency of a material.SOLUTION: The adsorption/desorption type concentration device having an adsorption rotor 1 includes: a humidifying means 10 for regeneration which humidifies air RA for regeneration passing through a regeneration zone 3; and a humidifying means 13 for purging which humidifies air PA for regeneration passing through a purge zone 4.

Description

  In the present invention, gaseous removal target substances (for example, volatile organic compounds used as solvents for various purposes, malodorous substances generated in various processes, etc.) contained in the process target air are treated from the process target air. The present invention relates to an adsorption / desorption type concentrating device that collects in a concentrated state.

  More specifically (see FIG. 1), a breathable adsorption rotor 1 holding the adsorbent X is provided, and the processing area 2 and the regeneration area 3 are partitioned in the rotation direction of the rotation area of the adsorption rotor 1. The present invention relates to an adsorption / desorption type concentrating apparatus that is configured to repeatedly pass each part in the rotation direction of the adsorption rotor 1 through the treatment area 2 and the regeneration area 3 in this order from the rotation of the adsorption rotor 1.

  In this adsorption / desorption type concentrating device, in the treatment area 2, by passing the treatment target air IA through the rotor portion in the passage process, the gaseous removal target substance V contained in the treatment target air IA is passed through the process. It is made to adsorb | suck to the holding | maintenance adsorbent X of the rotor part in which it isolate | separates and removes from process object air IA.

  Further, in the regeneration zone 3, the removal target substance V adsorbed in the processing zone 2 by the retained adsorbent X in the rotor zone is passed from the processing target air IA by passing the regeneration air RA through the rotor portion in the process of passing through the zone. The retained adsorbent X in the rotor portion that is in the process of passing through the region is regenerated by desorbing the regeneration air RA with a small air volume.

  That is, the removal target substance V separated and removed from the processing target air IA by being adsorbed on the adsorbent X in the processing area 2 is desorbed from the adsorbent X in the regeneration area 3 so that the regeneration air RA has a smaller air volume than the processing target air IA. By shifting, the gaseous removal target substance V contained in the processing target air IA is collected in a concentrated state by the air volume ratio between the processing target air and the regeneration air.

  Conventionally, in this type of adsorption / desorption type concentrator, for example, as seen in Patent Document 1 (see FIG. 15), the removal target substance V adsorbed by the adsorbent X in the treatment area 2 is removed from the adsorbent X in the regeneration area 3. As the regeneration air RA to be desorbed, one that passes hot air or steam (water vapor) through the regeneration zone 3 is known.

  Further, as seen in Patent Documents 1 and 2 (see FIGS. 15 and 16), in the rotation region of the suction rotor 1, purge is performed on the lower side of the regeneration region 3 in the rotor rotation direction and on the upper side of the processing region 2 in the rotor rotation direction. It is also known that the area 4 is partitioned and each part in the rotation direction of the adsorption rotor 1 is repeatedly passed through the processing area 2, the regeneration area 3, and the purge area 4 in this order by the rotation of the adsorption rotor 1.

  In the purge zone 4, the retained adsorbent X in the rotor portion passing through the region is passed through by passing the purge air PA through the rotor portion passing through the zone (that is, the rotor portion passing through the regeneration zone 3). Cool before moving to the treatment area 2.

  In addition, in the case where such a purge area 4 is provided, the used purge air PA ′ that has passed through the purge area 4 is regenerated as seen in Patent Documents 1 and 2 (see FIGS. 15 and 16). Also known is the air RA which is ventilated to the regeneration zone 3 while being heated by the regeneration heating means 5.

JP-A-53-50069 JP-A-7-75714 Japanese Patent Laid-Open No. 54-26971

  By the way, the concentration factor C of the removal target substance V in this type of adsorption / desorption type concentrator (that is, the concentration ratio of the treatment target substance V separated and removed from the treatment target air IA in the treatment zone 2) is expressed by the following equation. The

C = Qi / Qo
Qi: Air volume of the processing target air IA ventilating the processing area 2 Qo: Air volume of the used regeneration air RA ′ taken out of the apparatus after passing through the regeneration area 3

  That is, in order to increase the concentration ratio C in this type of adsorption / desorption type concentrator, it is necessary to reduce the air volume of the regeneration air RA that is ventilated in the regeneration zone 3.

  However, if the air volume of the regeneration air RA is reduced to increase the concentration rate C, the efficiency of separating and removing the removal target substance V from the process target air IA by adsorption in the process area 2 as shown in FIG. In other words, there is a problem in that the substance recovery efficiency η of the apparatus itself decreases.

  That is, as the air volume of the regeneration air RA becomes smaller, it becomes more difficult to desorb the removal target substance V from the adsorbent X in the regeneration zone 3, and a considerable amount of the removal target substance V in the adsorption state is desorbed. The state of insufficient desorption remaining in the adsorbent X without being performed (in other words, the state of insufficient regeneration) occurs, and this causes a decrease in the material recovery efficiency η (in other words, purification efficiency of the processing target air IA). To do.

  Further, in order to avoid such a decrease in the substance recovery efficiency η, it is possible to increase the temperature tr of the regeneration zone 3 (≈the temperature of the regeneration air RA) to avoid the occurrence of the insufficient desorption state as described above. Although it is necessary, in order to raise the temperature tr of the regeneration zone 3, a device component having high heat resistance and pressure resistance is required, and a heavy insulation is required, resulting in a problem that the device cost increases. .

  Furthermore, even if an apparatus component having high heat resistance and pressure resistance is used, there is a limit in terms of heat resistance and pressure resistance to increase the temperature tr of the regeneration zone 3, and therefore, the material recovery efficiency η In some cases, it is not possible to avoid the decrease in the level.

  In view of this situation, the main problem of the present invention is to adopt a rational apparatus configuration, so that a high concentration factor C can be obtained while ensuring a high substance recovery efficiency η of the apparatus, and the apparatus cost and operation It is in the point which provides the adsorption / desorption type concentrator which is advantageous also in terms of cost.

The first characteristic configuration of the present invention relating to the adsorption / desorption type concentrator is as follows:
A breathable adsorption rotor holding an adsorbent is provided, and a processing area and a regeneration area are defined in the rotation area of the adsorption rotor in a rotational direction of the rotor. It is configured to repeatedly pass each part in the direction through the processing area and the reproduction area in that order,
In the treatment area, by passing the air to be treated through the rotor portion in the process of passing through the region, the gaseous removal target substance contained in the air to be treated is adsorbed on the retained adsorbent of the rotor part in the process of passing through the region. To separate and remove from the target air
In the regeneration zone, the regeneration air is passed through the rotor portion in the process of passing through the zone so that the removal target substance adsorbed in the treatment zone by the retained adsorbent of the rotor portion has a smaller air volume than the treatment target air. An adsorption / desorption type concentrating device that regenerates the retained adsorbent of the rotor part that is in the process of passing through the region,
Regeneration humidifying means for humidifying the regenerative air passing through the regeneration area is provided.

  That is, as shown in Patent Document 3, when water vapor is used as the regenerating air that is ventilated in the regenerating area, the water vapor component (that is, water) is replaced with the substance to be removed in the adsorbed state and adsorbed on the adsorbent. Substitutional adsorption can occur in the regeneration zone, whereby the removal target substance in the adsorption state is driven out of the adsorbent by moisture, and the removal target substance in the adsorption state is transferred from the adsorbent to the regeneration air in the regeneration zone. Efficient desorption is possible.

  That is, by using this substitution adsorption, it is possible to effectively avoid the occurrence of the above-described insufficient desorption state in the regeneration region while reducing the air volume of the regeneration air.

  However, when steam is used as regeneration air, even if it is low-temperature and low-pressure steam (for example, saturated steam at 100 ° C.), an apparatus component having appropriate heat resistance and pressure resistance is required, and due to heat dissipation. In order to prevent the condensation of water vapor, heavy heat insulation is also necessary, and this does not solve the problems of the conventional apparatus described above.

  On the other hand, as a result of experiments and the like, the inventor of the present invention has shown that the regeneration air RA is in a humidified state (unsaturated moisture that is simply increased in humidity) as shown in FIG. 14 without using water vapor as the regeneration air. Even in the air state), the above-described substitutional adsorption can be generated in the regeneration zone, which makes it possible to perform adsorption while using low-temperature regeneration air (which is naturally higher than the processing zone temperature and the purge zone temperature). The present inventors have found that a substance to be removed in a state can be efficiently desorbed from the adsorbent in the regeneration zone, and insufficient desorption can be avoided.

  Here, in the example shown in FIG. 14, the moisture content of the low temperature regeneration air at the same temperature (25 ° C.) is the same as when the moisture concentration of the low temperature regeneration air (25 ° C.) is 0 ppm (corresponding to no humidification). The comparison is made with the case where the concentrations are 8013 ppm, 15977 ppm, 23894 ppm, and 31863 ppm (corresponding to humidification to 25%, 50%, 75%, and 100% relative humidity, respectively).

  As can be seen from this example, even if the low-temperature (25 ° C.) regeneration air is simply brought into an unsaturated humidified state having a moisture concentration of a certain level (graphs 3 to 5), The concentration of the object to be removed (that is, the concentration of the object to be removed desorbed from the adsorbent in the regeneration zone) can be secured high. In other words, the moisture given to the regeneration air by humidification is the adsorbed substance to be removed. Substitution adsorption that is substituted and adsorbed on the adsorbent occurs, whereby the substance to be removed in the adsorbed state (in this example, isopropyl alcohol: IPA) is efficiently desorbed from the adsorbent.

  Therefore, in the above configuration, the regeneration air is brought into an unsaturated humidified state having a moisture concentration of a certain level or more by humidification by the regeneration humidifying means, so that the air volume of the regeneration air can be reduced while using the low temperature regeneration air. While increasing the concentration rate C with a small air volume, it is possible to effectively avoid the occurrence of insufficient desorption in the regeneration zone, whereby the adsorbent (that is, the sufficiently regenerated adsorbent in the treatment zone). ) Can be efficiently adsorbed on the substance to be removed in the air to be treated, and the substance recovery efficiency η of the apparatus can be secured high.

  In addition, since it is only necessary to bring the low-temperature regeneration air into an unsaturated humidified state as described above, compared to using steam as the regeneration air as seen in Patent Documents 1 and 3, the apparatus constituent material The required heat resistance and pressure resistance can be effectively reduced, and it is also possible to avoid the need for heavy heat insulation to prevent water vapor condensation due to heat dissipation. Thus, the apparatus cost can be effectively reduced.

  Moreover, compared to using steam as the regeneration air, the amount of heat and water required to generate the regeneration air can also be reduced, thereby reducing the operating cost and making the device more advantageous in terms of energy saving. Can do.

  In addition, the adsorbent that has been in a moisture adsorption state due to substitution adsorption in the regeneration area (that is, the adsorbent that has been sufficiently regenerated by effectively removing the substance to be removed) is moved to the treatment area where the air to be treated is ventilated. Then, due to the difference in the amount of equilibrium adsorption at the treatment zone temperature lower than the regeneration zone temperature, the reverse substitution adsorption that is adsorbed to the adsorbent occurs in the state where the removal target substance in the treatment target air substitutes the adsorbed moisture, As a result, a high substance recovery efficiency η is ensured as described above.

  In the implementation of the above configuration, in addition to providing a processing area and a regeneration area in the rotation area of the adsorption rotor, a purge area is partitioned on the lower side of the regeneration area in the rotor rotation direction and on the upper side of the processing area in the rotor rotation direction. The respective portions in the rotation direction of the adsorption rotor may be repeatedly passed through the processing area, the regeneration area, and the purge area in this order by the rotation of the adsorption rotor.

  That is, in this purge region, the purge air is blown through the rotor portion that is passing through the region, thereby cooling the rotor portion that is passing through the region (that is, the rotor portion that has passed through the regeneration region) and The retained adsorbent is cooled prior to moving to the next processing zone. (The purge zone temperature is lower than the regeneration zone temperature and higher than the processing zone temperature or the same temperature as the processing zone temperature.)

  In the implementation of the above configuration, the direction of ventilation of the air to be treated with respect to the adsorption rotor in the treatment area and the direction of ventilation of the regeneration air with respect to the adsorption rotor in the regeneration area may be either the same direction or the opposite direction. In order to ensure a higher recovery efficiency η, it is desirable to reverse the direction of ventilation of the air to be treated to the adsorption rotor in the treatment area and the direction of ventilation of the regeneration air to the adsorption rotor in the regeneration area.

  That is, the desorption of the substance to be removed by substitution adsorption as described above in the regeneration zone proceeds more effectively on the regeneration zone inlet side (regeneration air inflow side) than on the outlet side. The adsorption effect on the removal target substance is also higher on the side corresponding to the regeneration zone inlet side than on the opposite side.

  Therefore, the removal target substance in the processing target air that passes through the processing area with the airflow direction of the processing target air to the adsorption rotor in the processing area and the ventilation direction of the regeneration air to the adsorption rotor in the regeneration area being opposite to each other. The substance recovery efficiency η can be increased by adopting a form in which the substance to be removed is adsorbed with a higher adsorption effect toward the treatment area outlet side where the concentration of the catalyst gradually decreases.

  In the implementation of the above configuration, the regeneration is performed by adjusting the humidification amount in the regeneration humidifying means so that the humidity of the regeneration air at the regeneration area inlet or the used regeneration air at the regeneration area outlet is maintained at the set humidity. Humidifying amount adjustment means for the regenerative air, or the target humidity of the regenerating air that is the adjustment target of the regenerating humidifying means according to the concentration of the removal target substance in the processing target air, the adsorption amount of the removal target substance in the processing area, etc. It is desirable to provide a setting humidity changing means for regeneration that changes the temperature, so that the above-described effects can be obtained reliably and stably.

According to the second feature configuration of the present invention, in the implementation of the first feature configuration,
A purge area is defined in the rotation area of the suction rotor on the lower side of the regeneration area in the rotor rotation direction and on the upper side of the processing area in the rotor rotation direction, and each part in the rotation direction of the adsorption rotor is defined by the rotation of the adsorption rotor. It is configured to repeatedly pass through the processing area, the regeneration area, and the purge area in that order,
In the purge zone, the holding adsorbent of the rotor part in the region passing process is cooled by passing purge air through the rotor part in the region passing process,
The used purge air that has passed through the purge zone is used as the regeneration air, which is heated by the regeneration heating means, and is then passed through the regeneration zone while being humidified by the regeneration humidification means. It is in a certain point.

  That is, the use of spent purge air that has passed through the purge zone as regeneration air for the purpose of heat recovery can also be seen in the aforementioned Patent Documents 1 and 2, as described above in the implementation of the first characteristic configuration. If used purge air is used as regeneration air, the following effects can be obtained in addition to heat recovery.

  That is, in the configuration in which the regeneration air that is ventilated in the regeneration area is humidified by the regeneration humidifying means, a part of the humidified regeneration air that is ventilated in the regeneration area moves from the regeneration area to the next purge area. In order to move to the purge zone together with the rotor portion while remaining in the portion, in the purge zone, the rotor portion that is passing through the zone is cooled by ventilation of the purge air, and the retained adsorbent in the rotor portion is cooled. The humidified regeneration air remaining in the rotor portion is also carried away together with the purge air.

  Accordingly, the used purge air that has passed through the purge zone retains the humidified moisture of the remaining regeneration air together with the amount of heat obtained by cooling the rotor portion, and this used purge air is used as the regeneration air as described above. As a result, purge air is obtained by cooling the rotor portion as the necessary heating amount in the regeneration heating means (that is, a necessary amount of heat that can be small because low temperature regeneration air is sufficient as described above). It can be further reduced by the amount of heat.

  In addition, the required amount of humidification in the regenerating humidifying means (that is, the necessary amount of humidification that requires only a small amount of regenerative air as described above only needs to be small) can also be used as the residual regeneration from the purge air. It is possible to further reduce the amount of humidified moisture in the working air, which makes it possible to further reduce the operating cost of the apparatus and to make it more advantageous in terms of energy saving.

The third characteristic configuration of the present invention relating to the adsorption / desorption type concentrating device is:
An air-permeable adsorption rotor holding an adsorbent is provided, and a process area, a regeneration area, and a purge area are arranged in the rotor rotation direction in that order in the rotation area of the adsorption rotor. More preferably, each part in the rotation direction of the adsorption rotor is repeatedly passed through the processing area, the regeneration area, and the purge area in that order.
In the treatment area, by passing the air to be treated through the rotor portion in the process of passing through the region, the gaseous removal target substance contained in the air to be treated is adsorbed to the holding adsorbent of the rotor part in the process of passing through the region. To separate and remove from the target air
In the regeneration zone, the regeneration air is passed through the rotor portion in the process of passing through the zone so that the removal target substance adsorbed in the treatment zone by the retained adsorbent of the rotor portion has a smaller air volume than the treatment target air. To regenerate the retained adsorbent of the rotor part that is in the process of passing through the region,
In the purge zone, an adsorption / desorption type concentrating device that cools the retained adsorbent of the rotor portion that is passing through the zone by passing purge air through the rotor portion that is passing through the zone,
Purge humidifying means for humidifying the purge air that is ventilated to the purge area is provided.

  That is, according to this configuration, even if the above-described state of insufficient desorption occurs in the regeneration area by reducing the air volume of the regeneration air without increasing the temperature of the regeneration air, By purging the purge air that has been humidified (unsaturated humid air that is simply increased in humidity) by the purge humidifier in the purge area, the humidified moisture of the purge air is adsorbed to the adsorbent. It is possible to cause substitution adsorption in the purge zone to replace the substance to be removed still remaining and adsorb to the adsorbent.

  Then, the state of insufficient desorption caused in the regeneration zone due to the substitution adsorption in the purge zone is resolved in the purge zone, and the adsorbent is sufficiently in the moisture adsorption state (that is, the substance to be removed) before moving to the next processing zone. Can be effectively desorbed and fully regenerated).

  That is, from this, as in the first characteristic configuration described above, while using low-temperature regeneration air, and while increasing the concentration factor C by reducing the air volume of the regeneration air and reducing the air volume, the adsorbent ( That is, the sufficiently regenerated adsorbent) can be efficiently adsorbed with respect to the removal target substance in the air to be treated, and the substance recovery efficiency η of the apparatus can be secured high.

  Further, as described above, since it is only necessary to bring the purge air into an unsaturated humidified state while using the low-temperature regeneration air, as shown in Patent Documents 1 and 3, steam is used as the regeneration air. In comparison, the heat resistance and pressure resistance required for equipment components can be effectively reduced, and avoiding the need for heavy heat insulation to prevent condensation of water vapor due to heat dissipation. Thus, the cost of the apparatus can be effectively reduced.

  In addition, compared with the case where steam is used as the regeneration air, the amount of heat and the amount of water required to generate the regeneration air and the purge air can be reduced, which reduces the operating cost and is advantageous in terms of energy saving. Can be a device.

  In the implementation of the above configuration, various types of regeneration air can be used. Even if an insufficient desorption state occurs in the regeneration zone as described above, the insufficient desorption state can be eliminated in the purge region. It is possible to increase the choices in terms of the composition and temperature of the regeneration air, thereby increasing the versatility of the apparatus.

  In the implementation of the above configuration, the flow direction of the air to be treated with respect to the adsorption rotor in the treatment area and the ventilation direction of the purge air with respect to the adsorption rotor in the purge area may be either the same direction or the opposite direction. In order to ensure a higher recovery efficiency η, it is desirable to reverse the direction of ventilation of the air to be treated to the adsorption rotor in the treatment area and the direction of ventilation of the purge air to the adsorption rotor in the purge area.

  That is, the desorption of the remaining removal target substance by substitution adsorption as described above in the purge zone proceeds more effectively on the purge zone inlet side (purging air inflow side) than on the outlet side. The adsorption effect on the removal target substance is also higher on the side corresponding to the purge zone inlet side than on the opposite side.

  Therefore, the removal target substance in the processing target air passing through the processing area with the direction of ventilation of the processing target air to the adsorption rotor in the processing area and the direction of ventilation of the purge air to the adsorption rotor in the purge area being opposite to each other. The substance recovery efficiency η can be increased by adopting a form in which the substance to be removed is adsorbed with a higher adsorption effect toward the treatment area outlet side where the concentration of the catalyst gradually decreases.

  In the implementation of the above-described configuration, a purge that adjusts the humidification amount in the purge humidifying means so that the humidity of the purge air at the purge zone inlet or the humidity of the used purge air at the purge zone outlet is maintained at the set humidity. A humidifying amount adjusting means for the purifying air, or the setting humidity of the purging air, which is the adjustment target of the purging humidifying means, according to the concentration of the removing target substance in the processing target air, the adsorption amount of the removing target substance in the processing area, etc. It is desirable to provide a setting humidity changing means for purging to be changed, and thereby to obtain the above-described effects reliably and stably.

According to the fourth feature configuration of the present invention, in the implementation of the third feature configuration,
Purge heating means for heating the purge air that is ventilated to the purge area before humidification by the purge humidification means is provided.

  That is, according to this configuration, the purging air is heated by the purging heating means before being humidified by the purging humidifying means, so that the purging air is humidified by the purging humidifying means as compared with the case where the heating is not performed. The allowable humidification amount of air (that is, the amount of humidified water that can be held in the purge air) can be increased.

  This makes it possible to more effectively and reliably eliminate the insufficient desorption state due to substitution adsorption as described above in the purge zone (that is, desorption of the removal target substance still remaining in the adsorbent in the adsorption state). As a result, it is possible to more effectively and reliably achieve a high material recovery efficiency η of the apparatus while increasing the concentration factor C.

The fifth feature configuration of the present invention is the implementation of the third or fourth feature configuration.
The used purge air that has passed through the purge zone is passed through the regeneration zone while being heated by the regeneration heating means as the regeneration air.

  In other words, the use of the used purge air that has passed through the purge zone as regeneration air for the purpose of heat recovery can also be seen in Patent Documents 1 and 2, as described above. If the used purge air is used as regeneration air as described above, the following effects can be obtained in addition to heat recovery.

  That is, even if a part of the humidified moisture applied to the purge air by the purge humidifying means remains in the used purge air that has passed through the purge zone without being substituted and adsorbed due to a bypass factor, etc. By using this used purge air as the regeneration air as described above, the remaining humidified moisture of the used purge air is replaced with the removal target substance in the adsorption state in the regeneration zone and adsorbed by the adsorbent. Substitutional adsorption can occur.

  This makes it possible to contribute to the desorption of the substance to be removed from the adsorbent more effectively and surely with the humidified moisture applied to the purge air, and thereby the substance recovery of the apparatus while increasing the concentration factor C. Ensuring high efficiency η can be achieved more effectively and reliably.

  Note that the used purge air that has passed through the purge zone contains the substance to be removed that has been desorbed from the adsorbent by substitution adsorption in the purge zone. The contained removal target material can be recovered from the regeneration zone in a state where it is included in the used regeneration air together with the removal target material desorbed from the adsorbent in the regeneration zone.

The sixth feature configuration of the present invention is any one of the third to fifth feature configurations,
Aside from the purging humidifying means, there is provided a regenerating humidifying means for humidifying the regenerating air flowing through the regeneration area.

  In other words, according to this configuration, the humidified moisture imparted to the regeneration air by the regeneration humidifying means is substituted and adsorbed by the adsorbent in the regeneration area, and the removal target substance in the adsorption state is efficiently desorbed to the regeneration air in the regeneration area. The above-described first characteristic configuration and the humidified moisture imparted to the purge air by the purge humidifying means are substituted and adsorbed by the adsorbent in the purge area, and the removal target substance still remaining in the adsorbent in the adsorbed state is efficient in the purge area. It is possible to adopt an operation mode in which the third characteristic configuration that is well desorbed to the purge air is used.

  This combined use can achieve the intended purpose of ensuring a high material recovery efficiency η of the apparatus while increasing the concentration factor C more effectively and reliably. The apparatus can be particularly suitable when the apparatus load varies greatly, such as a large concentration change of the target substance.

The seventh feature configuration of the present invention is any one of the first to sixth feature configurations,
A vaporizing, water spraying, or ultrasonic humidifier is provided as the regeneration humidifying means or the purging humidifying means.

  That is, in the implementation of any of the first to sixth characteristic configurations, various types of humidifiers such as a water heating type that generates water by heating water can be used for the humidifying means for regeneration or the humidifying means for purging. However, as described above, as the humidifying means for regeneration or the humidifying means for purging, a vaporization type that evaporates water impregnated in the impregnating material in the air to be humidified, a water spray type that evaporates spray water in the air to be humidified, or If an ultrasonic humidifier that applies ultrasonic vibrations to water to disperse water particles in the air to be humidified is used, the device configuration is simplified compared to a water heating humidifier that requires a heat source. This facilitates the manufacture of the device and facilitates the maintenance of the device.

  As a result, in combination with the fact that low-temperature regeneration air is sufficient as described above, the apparatus can be further improved in terms of handleability.

The eighth feature configuration of the present invention is the implementation of any one of the first to seventh feature configurations,
The temperature of the regeneration air passing through the regeneration zone is set to a set temperature of less than 100 ° C.

  That is, in this configuration, the temperature of the regeneration air is set to a set temperature of less than 100 ° C. by taking advantage of the low temperature regeneration air as described above, but the temperature of the regeneration air is made less than 100 ° C. in this way. Thus, the apparatus can be handled very easily. Particularly, in the case where a humidifying means for regeneration is provided, the temperature of the regeneration air is set to a temperature lower than 100 ° C. which is the boiling point of water. Humidity management can be facilitated.

The ninth feature configuration of the present invention is the implementation of the second or fifth feature configuration,
The total amount of the regeneration air is configured such that the used purge air that has passed through the purge zone is used as the regeneration air.

  In other words, as described above, this configuration makes use of the fact that the material recovery efficiency η of the apparatus can be secured high while obtaining a high concentration ratio C by reducing the air volume of the regeneration air as described above. For example, a configuration in which mixed air of purge air and outside air that has passed through the purge zone is passed through the regeneration zone as regeneration air, or total amount of used purge air that has passed through the purge zone with the entire amount of regeneration air being outside air Compared to a configuration in which the device is processed by another part of the device, the device configuration (especially the air channel configuration) can be simplified, which can further reduce the device cost and make the device more excellent in terms of handling. can do.

  In the implementation of this configuration, the air volume of the regeneration air is equal to the air volume of the used purge air (in other words, the entire amount of used purge air passes through the regeneration zone as the total amount of regeneration air. It is most desirable to adopt a configuration that allows

  In the practice of the present invention, the purge air that is ventilated to the purge zone uses various types such as outside air, a part of the treated purified air from which the removal target substance is separated and removed in the treatment zone, or a part of the treatment target air. However, in order to secure the material recovery efficiency η of the equipment as high as possible, it is most advantageous to use the outside air as purge air, and then the processed purification that separates and removes the substance to be removed in the treatment area. It is then advantageous to use part of the air as purge air.

Device configuration diagram showing the first embodiment Device configuration diagram showing a second embodiment Device configuration diagram showing a third embodiment Device configuration diagram showing a fourth embodiment Device configuration diagram showing the fifth embodiment Device configuration diagram showing a sixth embodiment Device configuration diagram showing a seventh embodiment Device configuration diagram showing the eighth embodiment Device configuration diagram showing the ninth embodiment Device configuration diagram showing the tenth embodiment Device configuration diagram showing the eleventh embodiment Device configuration diagram showing the twelfth embodiment Device configuration diagram showing the thirteenth embodiment Graph showing the correlation between the concentration of substances to be removed at the regeneration zone outlet and the moisture concentration in the regeneration air Device configuration diagram of conventional device Device configuration diagram of other conventional devices Graph showing the correlation between concentration ratio and substance recovery efficiency in conventional equipment

  FIGS. 1 to 13 each show an embodiment of an adsorption / desorption concentrator according to the present invention. In each figure, 1 is a breathable adsorption rotor such as a honeycomb structure holding an adsorbent X such as activated carbon or zeolite. In each figure, for easy understanding, it is shown in a developed state in the rotor circumferential direction (rotor rotation direction).

  Further, in the rotation region of the adsorption rotor 1, a processing region 2, a regeneration region 3, and a purge region 4 are partitioned in a state in which they are arranged in that order in the rotor rotation direction. Each part in the rotor rotation direction (hereinafter referred to as a rotor part) is repeatedly passed through the processing area 2, the regeneration area 3 and the purge area 4 in that order.

  Basically, in the treatment area 2, by passing the treatment target air IA through the rotor portion that is passing through the region, the gaseous removal target substance V such as a volatile organic compound contained in the treatment target air IA is obtained. It is adsorbed by the holding adsorbent X in the rotor portion that is passing through the region and separated and removed from the processing target air IA, thereby purifying the processing target air IA.

  Further, in the regeneration zone 3, by passing the regeneration air RA heated by the regeneration heater 5 (an example of the regeneration heating means) through the rotor portion in the process of passing through the region, the retained adsorbent X in the rotor portion becomes first. The removal target substance V adsorbed in the treatment area 2 is desorbed to the regeneration air RA to regenerate the retained adsorbent X in the rotor portion that is in the process of passing through the area.

  Here, the air flow rate Qo of the regeneration air RA is smaller than the air flow rate Qi of the processing target air IA (Qo <Qi), so that the removal target substance V contained in the processing target air IA is contained in this apparatus. It is recovered in a concentrated state with a high concentration, and its concentration ratio C is expressed by C = Qi / Qo.

  On the other hand, in the purge zone 4, the purge air PA is blown through the rotor portion that is passing through the zone, thereby cooling the rotor portion that is passing through the zone (that is, the rotor portion that has been heated through the regeneration zone 3). Then, the retained adsorbent X in the rotor portion is cooled prior to moving to the next processing area 2.

  In addition to the cooling of the adsorbent X, the remaining regeneration air RA brought into the purge zone 4 from the regeneration zone 3 together with the rotor portion while remaining in the rotor portion is scavenged by the purge air PA.

(First embodiment)
In the apparatus shown in FIG. 1, a part of the processing target air IA guided to the processing region 2 through the processing target air path 6 is diverted to the purge air path 7, and the split processing target air IA is used as the purge air PA for purging. Pass through the air path 7 to the purge zone 4.

  Further, the used purge air path 8 that guides the used purge air PA ′ that has passed through the purge zone 4 is connected to the regeneration air path 9, and the used purge air PA ′ is regenerated as the regeneration air RA. After being heated by the heater 5, the air is passed through the regeneration air passage 9 to the regeneration zone 3.

  The direction of ventilation of the regeneration air RA to the adsorption rotor 1 in the regeneration zone 3 and the direction of ventilation of the processing target air IA to the adsorption rotor 1 in the treatment zone 2 are opposite to each other, and the adsorption rotor 1 in the purge zone 4 The air flow direction of the purge air PA with respect to the air flow direction is the same as the air flow direction of the processing target air IA with respect to the adsorption rotor 1 in the processing area 2.

  A regeneration humidifier 10 (an example of regeneration humidifying means) is provided on the downstream side of the regeneration heater 5 in the regeneration air passage 9, and regeneration air RA (used purge air PA ') is regenerated. The heater 5 is heated to the set temperature tr, and following the heating, it is passed through the regeneration zone 3 while being humidified to the set humidity hr (in other words, the set moisture concentration) by the regeneration humidifier 10.

  Here, the humidified state refers to an unsaturated humid air state in which the humidity is simply increased (the same applies hereinafter).

  That is, in the apparatus of FIG. 1, the removal target substance obtained by adsorbing the humidified moisture of the regeneration air RA (moisture given by humidification by the regeneration humidifier 10) in the regeneration region 3 on the adsorbent X in the previous treatment region 2. It is adsorbed on the adsorbent X in a form of substitution with V (substitution adsorption), and the substance to be removed V is efficiently desorbed from the adsorbent X into the regeneration air RA in the regeneration zone 3 by this substitution adsorption.

  That is, by efficiently desorbing the removal target substance V in the regeneration zone 3 by substitution adsorption by humidification in this way, the necessary temperature tr of the regeneration air RA is reduced, and the necessary air volume Qo of the regeneration air RA is also reduced. While reducing and increasing the concentration factor C of the removal target substance V in the apparatus, the apparatus also ensures a high substance recovery efficiency η (efficiency for separating and recovering the removal target substance V from the process target air IA in the processing zone 2). It is.

  In the figure, reference numeral 11 denotes a processed purified air passage that guides the processing target air IA ′ that has passed through the processing area 2, that is, the processed purified air from which the removal target substance V has been removed.

  Reference numeral 12 denotes a used regeneration air passage that guides the used regeneration air RA ′ that has passed through the regeneration zone 3, and is a substance to be removed V (ie, desorbed) contained in the used regeneration air RA ′ in a concentrated state. The substance to be removed) is recovered by being cooled and liquefied with a condensing device, or is combusted with a combustion device (and so on).

(Second Embodiment)
In the apparatus shown in FIG. 2, instead of providing the regeneration humidifier 10 in the regeneration air passage 9, the purge air PA to be passed through the purge zone 4 is set to the set humidity hp (in other words, the set moisture concentration). A purge humidifier 13 (an example of a purge humidifier) for humidifying is provided in the purge air passage 7.

  Other than that, the apparatus of FIG. 1 is the same.

  That is, in the apparatus of FIG. 2, the humidified moisture of the purge air PA (moisture given by humidification by the purge humidifier 13) is adsorbed to the adsorbent X in the purge region 4 without being desorbed in the previous regeneration region 3. It is adsorbed on the adsorbent X in a form of replacement with the remaining target substance V to be removed (substitution adsorption), and the residual target substance V from the regeneration zone 3 is purged from the adsorbent X in the purge zone 4 by this substitution adsorption. Efficiently desorbs into the commercial air PA.

  That is, the necessary temperature tr of the regeneration air RA is reduced as in the apparatus of FIG. 1 by efficiently desorbing the residual removal target substance V from the regeneration zone 3 in the purge zone 4 by substitution adsorption by humidification in this way. However, the necessary air volume Qo of the regeneration air RA is also reduced to increase the concentration factor C of the removal target substance V in the apparatus, and to ensure a high substance recovery efficiency η of the apparatus.

  In implementing the apparatus of FIG. 2, as indicated by a broken line in FIG. 2, a purge heater 14 (a purge heating means) for heating the purge air PA to a set temperature tp prior to humidification by the purge humidifier 13 is shown. One example) may be provided in the purge air passage 7.

(Third embodiment)
In the apparatus shown in FIG. 3, as in the apparatus of FIG. 1, the regeneration humidifier 10 that humidifies the regeneration air RA to the set temperature hr is disposed downstream of the regeneration heater 5 and is installed in the regeneration air passage 9. It is.

  As in the apparatus of FIG. 2, the purge air passage 7 is equipped with a purge humidifier 13 that humidifies the purge air PA to the set humidity hp.

  Others are the same as the apparatus of FIG. 1 and the apparatus of FIG.

  That is, in the apparatus of FIG. 3, the humidified moisture of the regeneration air RA in the regeneration zone 3 is adsorbed (replaced) on the adsorbent X in the form of replacing the removal target substance V adsorbed on the adsorbent X in the previous treatment zone 2. Adsorption).

  Further, in the purge area 4, the humidified moisture of the purge air PA is adsorbed (replaced) on the adsorbent X in the form of being replaced with the remaining removal target substance V that remains adsorbed on the adsorbent X without being desorbed in the previous regeneration area 3. Adsorption)

  That is, before the adsorbent X returns to the treatment area 2 again, the removal target substance V adsorbed on the adsorbent X in the previous treatment area 2 by the substitution adsorption in the regeneration area 3 and the substitution adsorption in the purge area 4. Efficient desorption from the adsorbent X into the regeneration air RA and purge air PA, thereby reducing the required temperature tr of the regeneration air RA and also reducing the required air volume Qo of the regeneration air RA. Thus, while increasing the concentration factor C of the removal target substance V in the apparatus, the apparatus also ensures a high substance recovery efficiency η.

  3, the purge heater for heating the purge air PA to the set temperature tp prior to humidification by the purge humidifier 13 as shown by the broken line in FIG. 3 as in the apparatus of FIG. 14 may be provided in the purge air passage 7.

(Fourth to sixth embodiments)
In the apparatus shown in FIGS. 4 to 6, a part of the processed purified air IA ′ is diverted from the processed purified air path 11 to the purge air path 7, and the divided processed purified air IA ′ is purged with the purge air PA. To the purge zone 4 through the purge air passage 7.

  Further, the direction of ventilation of the purge air PA with respect to the adsorption rotor 1 in the purge area 4 is opposite to the direction of ventilation of the processing target air IA with respect to the adsorption rotor 1 in the treatment area 2.

  In other respects, the apparatus of FIG. 4 is the same as the apparatus of FIG. 1, the apparatus of FIG. 5 is the same as the apparatus of FIG. 2, and the apparatus of FIG. 6 is the same as the apparatus of FIG.

  5 and 6, the purge air PA is set to the set temperature prior to humidification by the purge humidifier 13 as indicated by the broken lines in FIGS. 5 and 6, as in the devices of FIGS. 2 and 3. A purge heater 14 for heating to tp may be provided in the purge air passage 7.

(Seventh to ninth embodiments)
In the apparatus shown in FIGS. 7 to 9, the outside air is passed as purge air PA through the purge air passage 7 to the purge zone 4.

  Otherwise, the apparatus of FIG. 7 is the same as the apparatus of FIG. 1, the apparatus of FIG. 8 is the same as the apparatus of FIG. 2, and the apparatus of FIG. 9 is the same as the apparatus of FIG.

  8 and 9, the purge air PA is set to a set temperature prior to humidification by the purge humidifier 13 as indicated by the broken lines in FIGS. 8 and 9, as in the devices of FIGS. 2 and 3. A purge heater 14 for heating to tp may be provided in the purge air passage 7.

(10th to 12th embodiments)
In the apparatus shown in FIGS. 10 to 12, as in the apparatuses of FIGS. 7 to 9, the outside air is passed as purge air PA through the purge air passage 7 to the purge area 4, but with respect to the adsorption rotor 1 in the purge area 4. The air flow direction of the purge air PA is opposite to the air flow direction of the processing target air IA with respect to the adsorption rotor 1 in the processing area 2.

  Otherwise, the device of FIG. 10 is the same as the device of FIG. 1, the device of FIG. 11 is the same as the device of FIG. 2, and the device of FIG. 12 is the same as the device of FIG.

  11 and 12, the purge air PA is set to a set temperature prior to humidification by the purge humidifier 13 as indicated by a broken line in FIGS. 11 and 12, as in the devices of FIGS. 2 and 3. A purge heater 14 for heating to tp may be provided in the purge air passage 7.

(13th Embodiment)
The apparatus shown in FIG. 13 is an improvement of the apparatus shown in FIG. 7. The apparatus shown in FIG. 13 is equipped with a heat pump 15, and air that cools the purge air PA and the processing target air IA by the heat absorption action of the heat pump 15. While providing the cooler 16, the regeneration heater 5 heats the regeneration air RA by the heat radiation action of the heat pump 15.

  Here, the air cooler 16 is either a direct expansion type cooler functioning as an evaporator of the heat pump 15 or a heat medium circulation heat exchanger that circulates a heat-absorbing heat medium with the evaporator of the heat pump 15. It's okay.

  Further, the regeneration heater 5 may be either a heat radiator that functions as a condenser of the heat pump 15 or a heat medium circulation heat exchanger that circulates a heat radiation heat medium between the heat pump 15 and the condenser of the heat pump 15.

  Further, in this example, both the purge air PA and the processing target air IA are cooled by the heat absorption action of the heat pump 15, but only one of the purge air PA and the processing target air IA is absorbed by the heat pump 15. You may make it cool by an effect | action.

  Such a configuration for cooling and heating the air using the heat pump 15 can be applied not only to the apparatus of FIG. 7 but also to the apparatus of other figures. For example, in the apparatus of FIG. The regeneration air RA and the purge air PA are heated by the heat radiation action of the heat pump 15 as the heating of the regeneration air RA by the regeneration heater 5 and the heating of the purge air PA by the purge heater 14. Also good.

(Another embodiment)
Next, another embodiment of the adsorption / desorption type concentrating device according to the present invention will be listed.

  In each of the above-described embodiments, an example in which the entire amount of the used purge air PA ′ is passed through the regeneration zone 3 as the total amount of the regeneration air RA has been described. However, the mixture of the used purge air PA ′ and the outside air is used. The air may be the regeneration air RA, or the entire amount of the regeneration air RA may be outside air.

  Further, a part or all of the used purge air PA ′ may be passed through the processing area 2 together with the processing target air IA.

  Although it is desirable that the temperature tr of the regeneration air RA passed through the regeneration zone 3 is as low as possible within a range where the required material recovery efficiency η is obtained, the adsorption / desorption type concentrator according to the present invention allows the regeneration air to pass through the regeneration zone 3. The temperature tr of the air RA may be less than 100 ° C.

  In each of the above-described embodiments, an example in which the regeneration air RA is temporarily passed through the regeneration region 3 has been described. However, in order to further increase the concentration factor C, a part of the regeneration air RA is regenerated. 3 may be cyclically repeated.

  In each of the above-described embodiments, an example in which the ventilation direction of the regeneration air RA with respect to the adsorption rotor 1 in the regeneration zone 3 and the ventilation direction of the processing target air IA with respect to the adsorption rotor 1 in the treatment zone 2 are reversed is shown. However, in some cases, the ventilation direction of the regeneration air RA with respect to the adsorption rotor 1 in the regeneration zone 3 and the ventilation direction of the processing target air IA with respect to the adsorption rotor 1 in the treatment zone 2 may be the same.

  In addition, the direction of ventilation of the purge air PA with respect to the adsorption rotor 1 in the purge area 4 may be the same as or opposite to the direction of ventilation of the regeneration air RA with respect to the adsorption rotor 1 in the regeneration area 3. What is necessary is just to select a preferable direction according to a case, such as making it the same direction as the ventilation direction of the process target air IA with respect to the adsorption | suction rotor 1, or a reverse direction.

  Various types of humidifiers such as a water heating type, a vaporization type, a water spray type, and an ultrasonic type are adopted as the regeneration humidifier 10 (regeneration humidification means) and the purge humidifier 13 (purge humidification means). However, it is desirable to use a vaporizing, water spraying, or ultrasonic humidifier that does not require a heating source.

  The adsorption / desorption concentration apparatus according to the present invention can be desorbed from the adsorbent X by substitution adsorption of moisture in the regeneration zone 3 and the purge zone 4, and is substituted and adsorbed to the adsorbent X in the moisture adsorption state in the treatment zone 2. As long as the gaseous substance can be removed, various gaseous substances such as volatile organic compounds and malodorous substances can be used as the removal target substance V.

  The processing target air IA may be any air including air exhausted from various facilities and apparatuses as long as it includes the gaseous removal target substance V as described above.

X Adsorbent 1 Adsorption rotor 2 Treatment area 3 Regeneration area IA Process target air V Material to be removed RA Regeneration air 10 Regeneration humidification means 4 Purge area PA Purge air PA 'Used purge air 5 Regeneration heating means 13 Humidifying means for purging 14 Heating means for purging

Claims (9)

A breathable adsorption rotor holding an adsorbent is provided, and a processing area and a regeneration area are defined in the rotation area of the adsorption rotor in a rotational direction of the rotor. It is configured to repeatedly pass each part in the direction through the processing area and the reproduction area in that order,
In the treatment area, by passing the air to be treated through the rotor portion in the process of passing through the region, the gaseous removal target substance contained in the air to be treated is adsorbed on the retained adsorbent of the rotor part in the process of passing through the region. To separate and remove from the target air
In the regeneration zone, the regeneration air is passed through the rotor portion in the process of passing through the zone so that the removal target substance adsorbed in the treatment zone by the retained adsorbent of the rotor portion has a smaller air volume than the treatment target air. An adsorption / desorption type concentrating device that regenerates the retained adsorbent of the rotor part that is in the process of passing through the region,
An adsorption / desorption type concentrating device provided with a regenerating humidifying means for humidifying regenerating air passing through the regeneration region. A purge area is defined in the rotation area of the suction rotor on the lower side of the regeneration area in the rotor rotation direction and on the upper side of the processing area in the rotor rotation direction, and each part in the rotation direction of the adsorption rotor is defined by the rotation of the adsorption rotor. It is configured to repeatedly pass through the processing area, the regeneration area, and the purge area in that order,
In the purge zone, the holding adsorbent of the rotor part in the region passing process is cooled by passing purge air through the rotor part in the region passing process,
The used purge air that has passed through the purge zone is used as the regeneration air, which is heated by the regeneration heating means, and is then passed through the regeneration zone while being humidified by the regeneration humidification means. The adsorption / desorption type concentrator according to claim 1. An air-permeable adsorption rotor holding an adsorbent is provided, and a process area, a regeneration area, and a purge area are arranged in the rotor rotation direction in that order in the rotation area of the adsorption rotor. More preferably, each part in the rotation direction of the adsorption rotor is repeatedly passed through the processing area, the regeneration area, and the purge area in that order.
In the treatment area, by passing the air to be treated through the rotor portion in the process of passing through the region, the gaseous removal target substance contained in the air to be treated is adsorbed to the holding adsorbent of the rotor part in the process of passing through the region. To separate and remove from the target air
In the regeneration zone, the regeneration air is passed through the rotor portion in the process of passing through the zone so that the removal target substance adsorbed in the treatment zone by the retained adsorbent of the rotor portion has a smaller air volume than the treatment target air. To regenerate the retained adsorbent of the rotor part that is in the process of passing through the region,
In the purge zone, an adsorption / desorption type concentrating device that cools the retained adsorbent of the rotor portion that is passing through the zone by passing purge air through the rotor portion that is passing through the zone,
An adsorption / desorption type concentrating device provided with a purging humidifying means for humidifying the purge air flowing through the purge region.   4. The adsorption / desorption type concentrating device according to claim 3, further comprising purge heating means for heating the purge air that is ventilated to the purge zone before humidification by the purge humidification means.   5. The adsorption / desorption type concentrating device according to claim 3, wherein the used purge air that has passed through the purge zone is passed through the regeneration zone while being heated by the regeneration heating means as the regeneration air.   The adsorption / desorption type concentrating device according to any one of claims 3 to 5, wherein a regenerating humidifying means for humidifying regenerating air that is ventilated to the regeneration zone is provided separately from the purging humidifying means.   The adsorption / desorption type concentrator according to any one of claims 1 to 6, wherein a vaporizing, water spraying or ultrasonic humidifier is provided as the regeneration humidifying means or the purging humidifying means.   The adsorption / desorption type concentrator according to any one of claims 1 to 7, wherein a temperature of the regeneration air that is ventilated in the regeneration zone is set to a set temperature of less than 100C.   The adsorption / desorption type concentrating device according to claim 2 or 5, wherein a used purge air that has passed through the purge zone is used as the regeneration air with respect to the total amount of the regeneration air.

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