JPH11188224A - Dry dehumidification system - Google Patents

Abstract

(57) [Problem] To produce air with an extremely low dew point of -80 ° C or less with small energy. SOLUTION: Dry dehumidification devices 10, 20, 30 are system-connected in series in three stages, and a dehumidification area 11 of a first stage rotor 11 is provided.
a is discharged to the dehumidifying area 21a of the rotor 21 of the second stage.
And the dehumidifying area 31a of the third-stage rotor 31
After dehumidification, the mixture is appropriately heated and cooled, and then supplied to the low dew point space S. Part of the air that has left the dehumidifying section 31a of the third-stage rotor 31 is introduced into the purge section 31c, and then into the regeneration section 31b. Since the air leaving the regeneration section 31b is still low in humidity, it is used for regeneration of the second-stage rotor 21. The performance of the rotor 21 has improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidification system used for supplying low dew point air to a target space, and more particularly, to reducing the processing air by passing the processing air through a rotatable rotor. The present invention relates to a dry dehumidification system using a dry dehumidifier.

[0002]

2. Description of the Related Art There is a cooling and dehumidifying method as a commonly used method for dehumidifying air. In the cooling and dehumidifying method, the dew point is -5.degree.
Only the above air can be formed, and it cannot cope with a low dew point (−50 ° C. or less). Therefore, a dry dehumidifier using a rotary rotor is used as an air conditioner for supplying such low dew point air. The dry dehumidifier has a honeycomb-shaped rotor impregnated with an absorbing liquid such as lithium chloride or calcium chloride, or a rotor composed of an adsorbent such as silica gel or zeolite, and the air passage area located on the end face of the rotor. That is, for example, the passage area of the air by a partition such as a chamber disposed on the end face of the rotor is divided into a dehumidification area and a regeneration area, and the processing air is passed through the dehumidification area while rotating the rotor to produce dry air, By passing high-temperature regeneration air through the regeneration section, the moisture in the adsorbent is evaporated into the regeneration air, and the dehumidification process is performed continuously.

In this case, when the rotor moves to the dehumidification zone while the temperature is high, the processing air passes through the rotor without dehumidification and raises the dew point. A purge area for cooling the rotor by passing air through the air may be set between the regeneration area and the dehumidification area.

[0004] When a low dew point is obtained by such a dehumidifier using a rotary rotor, since there is a limit in lowering the dew point temperature in one stage, that is, alone, when a lower dew point is obtained, There is known a method of operating a two-stage type, that is, two dry dehumidifiers connected in series. Japanese Patent Application Laid-Open No. 1-19962 discloses an example in which a single-stage rotor is used to improve the duct connection to obtain a low dew point with a single-stage dehumidifier.
No. 1 discloses this. However, the lowest dew point temperatures obtained with these devices are on the order of -80C. That is, hitherto, it has not been possible to achieve a dew point temperature of −80 ° C. or less even with a dry dehumidifier using a rotary rotor.

Therefore, a low dew point lower than that, ie, -80
As a method of obtaining so-called ultra-low dew point air at a temperature of not more than ° C, a method using an adsorption tower called a pressure swing dehumidification method is known. In this method, the raw air is compressed by a compressor to remove the drain in the air, and then passed through an adsorption tower containing an adsorbent. According to a method using a pretreatment device of a cryogenic separation plant as an example using this method, the water concentration is adjusted to 10 to 20 ppb.
(The dew point temperature could be lowered to -101 ° C to -98 ° C).

[0006]

However, in the pressure swing dehumidification method, large power is required to compress air first, and purified air is separately used for regeneration of the adsorbent in the adsorption tower. Energy consumption is large, the equipment is enlarged, and the running cost is very large.

The present invention has been made in view of the above circumstances, and provides a new dry dehumidification system for realizing an ultra-low dew point of -80 ° C. or less with less energy consumption than before and solves the problem. Its purpose is to achieve.

[0008]

According to one aspect of the present invention, there is provided a dehumidification system for supplying low dew point air to a target space, wherein processing air is provided in a rotatable rotor. And a dry dehumidifier that dehumidifies the processing air by passing through the system is connected in series in three stages, and the air dehumidified by the first stage dry dehumidifier is reduced by the second stage dry dehumidifier. The air dehumidified by the second-stage dry dehumidifier is configured to be dehumidified by the third-stage dry dehumidifier. The air passage area located on the end face side of each rotor is at least divided into a dehumidification area, a regeneration area, and a purge area, and the purge area is located before the transition from the regeneration area to the dehumidification area by rotation of the rotor. Pass through the dehumidification area of the rotor of the second stage dry dehumidifier And some of the air, along with configured to be introduced into the purge zone of the rotor of the second stage of the dry down dehumidifier, air passing through the purge zone is 2
A third stage dry dehumidifier configured to be mixed with air that has passed through the regeneration zone of the rotor of the first stage dry dehumidifier and introduced into the regeneration zone of the rotor of the first stage dry dehumidifier; A portion of the air that has passed through the dehumidification area of the rotor is configured to be introduced into the purge area of the rotor of the third-stage dry dehumidifier, and the air that has passed through the purge area is It is configured to be introduced into the regeneration zone of the rotor of the third stage dry dehumidifier, and the air that has passed through the regeneration zone of the rotor of the third stage dehumidifier is dried by the second stage. A dry dehumidification system is provided, characterized in that it is adapted to be introduced into a regeneration zone of a rotor of a wetting device.

In the dry dehumidification system having such a configuration, the air dehumidified by the first-stage dry dehumidifier is connected in series to three stages of the dry dehumidifier, and the air dehumidified by the first-stage dry dehumidifier is disposed in the second stage. , And then dehumidified by a third-stage dry dehumidifier, so that air having an ultra-low dew point of -80 ° C or less can be produced. In addition, not only the three-stage dry dehumidifier is connected in series, but also a part of the air that has passed through the dehumidification area of the rotor of the second-stage dry dehumidifier is converted to the second-stage dry dehumidifier. Into the purge area of the rotor
The air that has passed through the purge zone is mixed with the air that has passed through the regeneration zone of the rotor of the second stage dry dehumidifier, and introduced into the regeneration zone of the rotor of the first stage dry dehumidifier.
Part of the air that has passed through the dehumidification area of the rotor of the third stage dry dehumidifier is introduced into the purge area of the rotor of the third stage dry dehumidifier, and the air that has passed through the purge area is Since it is introduced into the regeneration zone of the rotor of the third stage dry dehumidifier, the capacity of the heater for heating the regeneration air can be reduced. In addition, the humidity of the air used to regenerate the rotor of the second stage dry dehumidifier is
Since it is lower than before, the performance of the rotor itself of the second-stage dry dehumidifier is improved. Therefore, also from this point, it is possible to produce ultra-low dew point air while saving energy.

In the dry dehumidification system of the first aspect, the air that has passed through the purge zone of the rotor of the second stage dry dehumidifier has passed through the regeneration zone of the rotor of the second stage dry dehumidifier. After mixing with air, this was introduced into the regeneration zone of the rotor of the first-stage dry dehumidifier, but instead of this, as described in claim 2, the mixed air A part may be introduced into the regeneration area of the rotor of the first-stage dry dehumidifier, and the remaining part may be introduced again into the regeneration area of the rotor of the second-stage dry dehumidifier. . By doing so, the amount of regeneration air from the rotor of the second-stage dry dehumidifier is increased, and the capacity is further improved.

According to a third aspect of the present invention, there is provided a dehumidification system used for supplying low dew point air to a target space, wherein dry air is passed through a rotatable rotor to dehumidify the processing air. The humidifiers are connected in series in three stages, and the air dehumidified by the first-stage dry dehumidifier is dehumidified by the second-stage dry dehumidifier and reduced by the second-stage dry dehumidifier. The humidified air is configured to be dehumidified by the third-stage dry dehumidifier, and the passage area of the air located on the end face side of each rotor in each of the second-stage and third-stage dry dehumidifiers is A second stage dry dehumidifier which is divided into at least a dehumidification zone, a regeneration zone, and a purge zone, and a purge zone is located before the transition from the regeneration zone to the dehumidification zone by rotation of the rotor. Part of the air that has passed through the dehumidification area of the rotor
It is configured to be introduced into the purge section of the rotor of the second stage dry dehumidifier, and the air passing through the purge section is introduced into the regeneration section of the rotor of the second stage dry dehumidifier. And the air having passed through the regeneration zone of the rotor of the second stage dry dehumidifier is introduced into the regeneration zone of the rotor of the first stage dry dehumidifier, and the third stage Part of the air that has passed through the dehumidification area of the rotor of the dry dehumidifier is configured to be introduced into the purge area of the rotor of the third-stage dry dehumidifier, and passed through the purge area. The air is configured to be introduced into the regeneration section of the rotor of the third-stage dry dehumidifier, and the air that has passed through the regeneration section of the rotor of the third-stage dry dehumidifier is removed by the second stage. Eye dry dehumidifier introduced into the regeneration area of the rotor Characterized in that it is configured to dry down dampening system is provided.

In the dry dehumidification system according to the third aspect, all the air that has passed through the purge section of the rotor of the second stage dry dehumidifier is regenerated to the regeneration zone of the rotor of the second stage dry dehumidifier. Since it is configured to be introduced, air having a lower dew point temperature can be used for regeneration than in the case of claims 1 and 2, and the regeneration capability of the rotor of the second-stage dry dehumidifier is further improved. ing.

According to a fourth aspect of the present invention, in the dry dehumidification system of the first aspect, the purge air that has passed through the purge section of the rotor of the third stage dry dehumidifier is introduced into the regeneration section of the rotor. Instead of this, a part of the air that has passed through the dehumidification area of the rotor of the third stage dry dehumidifier is also led to the regeneration area of the rotor, and the air that has passed through the purge area and the regeneration area is discharged. The mixture is introduced into the regeneration zone of the rotor of the second stage dry dehumidifier. According to such a configuration, the amount of regeneration air used for regeneration of each rotor of the second-stage and first-stage dry dehumidifiers can be increased.

Further, in the dry dehumidifying system according to the fourth aspect, as described in the fifth aspect, the air passing through the purge area of the rotor of the second stage dry dehumidifier is subjected to the second stage dry dehumidification. After mixing with the air that has passed through the regeneration section of the rotor of the humidifier, a part of the mixed air is introduced into the regeneration section of the rotor of the first stage dry dehumidifier, and the remaining part is divided into the second stage. May be introduced into the regeneration zone of the rotor of the dry dehumidifier. With such a configuration, the amount of regenerated air from the rotor of the second-stage dry dehumidifier is increased, and its capacity is improved.

In each of the dry dehumidification systems according to the above configuration, the return air is supplied to the first stage, the second stage, or the third stage according to the dew point temperature of the return air from the target space. It may be configured to return to the inlet side of the dehumidification area of the rotor of the dry dehumidification device of the stage. With such a system configuration, it is possible to reduce the intake amount of raw material air such as outside air, and it is possible to efficiently produce ultra-low dew point air of -80 ° C or less with less energy. In addition, since the rotor to be returned is selected according to the dew point temperature of the return air, efficient operation can always be performed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a system of a dry dehumidification system according to a first embodiment. This dry dehumidification system includes a target low dew point space S
The system is configured to supply air with an ultra-low dew point of -80 ° C or lower.

The outside air OA as the raw material air is guided to the processing system duct 1 and first cooled and dehumidified by the outside air processing cooler 2. The cooled and dehumidified air is then mixed with the purged air cooled by the outside air treatment cooler 2 and having passed through the purge section 11c of the rotor 11 of the first-stage dry dehumidification device 10.

As shown in FIGS. 2 and 3, the dry dehumidifier 10 has chambers 12 at both end surfaces of a rotating rotor 11.
13 are arranged. The end faces of the rotor 11 are arranged in the order of the rotation direction of the rotor 11 indicated by the arrows in FIG.
It is divided into three air passage areas, a dehumidification area 11a, a regeneration area 11b, and a purge area 11c, which are processing areas.
The outer end face of the chamber 12 has a dehumidification inlet 12a for connecting to a duct or the like corresponding to each of these areas.
A regeneration outlet 12b and a purge outlet 12c are formed.
A dehumidification outlet, a regeneration inlet, and a purge inlet are also formed on the outer end surface of the chamber 13 corresponding to the three sections (all are not shown). The rotor 11 of the dry dehumidifier 10 contains a hygroscopic material such as lithium chloride, silica gel, and zeolite.

As described above, the first-stage dry dehumidifier 1
The air mixed with the purge air of the rotor 11 is supplied by the outside air processing fan 3 to the first-stage dry dehumidifier 10.
For example, through the dehumidification area 11a of the rotor 11, the dew point temperature is reduced to -35 ° C.

The air that has passed through the dehumidification area 11a of the rotor 11 of the first-stage dry dehumidifier 10 is guided to the processing fan 4 and cooled by the pre-cooler 5, and then the second-stage dry dehumidifier 20 Is guided to the dehumidification area 21a of the rotor 21. Part of the air that has passed through the dehumidifying section 11a of the rotor 11 is introduced into the purge section 11c as purge air, and as described above, is cooled by the outside air processing cooler 2 and then mixed with the outside air OA. ing.

The second-stage dry dehumidifier 20 has basically the same configuration as the first-stage dry dehumidifier 10,
Are sectioned in the order of rotation of the rotor 21 into three air passage areas of a dehumidification area 21a, a regeneration area 21b, and a purge area 21c, which are processing areas. The air that has passed through the dehumidifying section 21a of the rotor 21 of the second-stage dry dehumidifying device 20 is dehumidified to, for example, air having a low dew point of -75 ° C.

The air that has passed through the dehumidifying section 21a of the rotor 21 of the second-stage dry dehumidifier 20 is then guided to the processing fan 6 and cooled by the precooler 7, and then the third-stage dry dehumidifier is used. Dehumidification area 3 of rotor 31 of dehumidification device 30
1a. The third-stage dry dehumidifier 30 also has basically the same configuration as the first-stage dry dehumidifier 10 described above, and the end face of the rotor 31 is a processing area in the order of rotation of the rotor 31. Dehumidification area 31a, regeneration area 31b,
The purge section 31c is divided into three air passage sections. The rotor 31 of the third stage dry dehumidifier 30
The air that has passed through the dehumidifying area 31a is between -90 ° C and -11 ° C.
Humidity is reduced to a very low dew point of 0 ° C.

The air that has passed through the dehumidifying section 31a of the rotor 31 of the third-stage dry dehumidifier 30 is heated by a heating coil (not shown) or cooled by a cooling coil (not shown) as required. After being set to the desired temperature by cooling or the like, the air is conveyed to the low dew point space S as the air supply SA through the air supply duct 8.

The rotor 3 of the third stage dry dehumidifier 30
Part of the ultra-low dew point air that has passed through the first dehumidification area 31a is:
Through the purge system return air duct 9, it is guided to the purge section 31 c of the rotor 31. The very low dew point air cools the rotor 31. Purge area 3 of rotor 31
The purge air that has passed through 1c is subjected to heat recovery as a regeneration system, and is heated by a regeneration heater 41.
2 guides the rotor 31 to a regeneration area 31b, whereby the regeneration of the rotor 31 is performed.

Since the air that has passed through the regeneration section 31b of the rotor 31 of the third-stage dry dehumidifier 30 has low humidity and high temperature, the air of the rotor 21 of the second-stage dry dehumidifier 20 will be described later. Can be used for playback.

On the other hand, a part of the low-dew point air that has passed through the dehumidifying section 21a of the rotor 21 of the second-stage dry dehumidifying apparatus 20 is guided to the purging section 21c of the rotor 21 through the purge system return air duct 43. Then, the rotor 21 is cooled here. The purge air that has passed through the purge section 21c has a relatively high temperature at the outlet of the rotor 21.
The heat is recovered and led to the second stage regeneration system.

That is, the air that has passed through the purge section 21c of the rotor 21 of the second-stage dry dehumidifier 20 is mixed with the regenerated air that has passed through the regeneration section 21b. The mixture is mixed with the regeneration air that has passed through the regeneration section 31b of the rotor 31, is once heated by the regeneration heater 44, and is again cooled by the regeneration fan 45 in the second-stage dry dehumidifier 20.
Of the rotor 21 of the rotor 21
It is used for playback. In this way, the capacity of the second-stage regeneration heater 4 can be reduced, and the humidity of the air used for regeneration can be lower than that of the conventional two-stage type. The performance of the rotor 21 is improved.

The air that has passed through the regeneration section 21b of the rotor 21 of the second-stage dry dehumidifier 20 and exited from the outlet is heated again by the regeneration heater 46, and regenerated by the regeneration fan 47. 10 are guided to a regeneration section 11b of the rotor 11 and used for regeneration of the rotor 11, and then the exhaust EA
Is discharged as On the other hand, since the purge air that has passed through the purge section 11c of the rotor 11 is air having a relatively low outlet temperature and low humidity, the purge air is cooled again by using a part of the outside air processing cooler 2 through the purge duct 48. ,
Used as processing air. D1 in FIG.
D4 is a damper appropriately interposed in the duct to adjust the air volume.

The return air RA1, RA from the low dew point space S
2. RA3 is the corresponding return air duct 51, 52, 53
Respectively, mixed with the introduced outside air OA, mixed with the air dehumidified in the dehumidification section 11a of the first-stage dry dehumidifier 10, and further reduced in the dehumidification area of the second-stage dry dehumidifier 20 The air is mixed with the dehumidified air at 21a and can be freely introduced into the dehumidified areas of the rotors 11, 21, and 31. These are selected by opening and closing the dampers D5, D6 and D7.

The dehumidification processing system according to the first embodiment is configured as described above, and as described above,
The air after cooling and dehumidification by the outside air processing cooler 2 is 1
Dehumidification is performed in the dehumidification area 11a of the dry dehumidification device 10 of the stage,
For example, the dew point temperature is lowered to −35 ° C. Next, after being cooled and dehumidified by the precooler 5, the dehumidification is further reduced by the dehumidification section 21a of the second-stage dry dehumidifier 20, and the dew point temperature is reduced to, for example, -75C. After being cooled and dehumidified again by the precooler 7, the dew point temperature is further lowered to -90 ° C to -110 ° C by the dehumidifying section 31a of the third-stage dry dehumidifying device 30. The air whose dew point temperature has been lowered to the ultra-low dew point as described above is then supplied to the target low dew point space S as an air supply SA after the temperature is adjusted by heating and cooling as required.

Therefore, even a system using a dry dehumidifier using a rotor, which has been impossible so far, can realize such an ultra-low dew point of -80 ° C. or less.

Experiments using the system configuration according to the first embodiment yielded the following results. However, the air passage area on the end face side of each rotor (all of which is a silica gel rotor) of each of the first-stage, second-stage, and third-stage dry dehumidifiers used in the experiment was as shown in FIGS. The area ratio was appropriate.

That is, the rotor 11 ′ of the first-stage dry dehumidifier 10 has no purge section,
The ratio (area ratio) of the air passage area on the end face side of the rotor 11 ′ viewed from the axial direction is represented by the dehumidification area 1 in terms of the central angle.
The size of 1′a is 270 °, the regeneration area 11′b is 90 °, and the size of the rotor 11 ′ is 350 mm in diameter and 200 mm in thickness. The rotor 11 'is rated at an air volume of 2 CMM, a processing temperature of 5 ° C., and a regeneration temperature of 12
0 ° C.

As for the rotor 21 of the second-stage dry dehumidifier 20, as shown in FIG. 5, the central angle of the ratio of the air passage area on the end face side of the rotor 21 as viewed from the axial direction is the dehumidification area. The size of the rotor 21 was 270 °, the regeneration zone 21b was 60 °, the purge zone 21c was 30 ° C., and the rotor 21 was 550 mm in diameter and 400 mm in thickness.
The ratings are: air volume is 16 CMM, processing temperature is 5 ° C,
The regeneration temperature is 120 ° C.

With respect to the rotor 31 of the third-stage dry dehumidifier 30, as shown in FIG. 6, the central angle of the ratio of the air passage area on the end face side of the rotor 31 as viewed from the axial direction is the dehumidification area. 31a is at 216 °, the regeneration zone 31b is at 72 °, and the purge zone 31c is at 72 ° C. The rotor 31 used had a diameter of 250 mm and a thickness of 400 mm.
The ratings are as follows: air volume is 2 CMM, processing temperature is 5 ° C., and regeneration temperature is 120 ° C.

When the rotor was operated and the outlet temperature of the second-stage dry dehumidifier 20 was returned to the second-stage inlet by about 90% while using the rotor, the outlet of the second-stage dry dehumidifier 20 was operated. As a result of operating using air having a dew point temperature of -70.2 ° C., at the outlet of the third-stage dry dehumidifier 30, -98.6 ° C.
The dew point temperature was obtained.

Further, not all the air that has passed through the dehumidifying section 31a of the third-stage dry dehumidifier 30 is used as it is as the air supply SA.
Is introduced into the purge section 31c of the rotor 31 and is used as purge air.
Is introduced into the regeneration section 31b to be used for regeneration of the rotor 31 of the third-stage dry dehumidifier 30, and the air after regeneration is supplied to the second-stage regeneration air. Second, the capacity of the regeneration heater 44 used for regeneration of the rotor 21 of the second-stage dry dehumidifier 20 can be reduced.

In addition, since the humidity of the air used for regeneration of the rotor 21 of the second-stage dry dehumidifier 20 is lower than that of the conventional two-stage type, the regeneration effect is large, and as a result, Rotor 2 of second-stage dry dehumidifier 20
1 itself has improved dehumidification capacity. Accordingly, the above-described ultra-low dew point can be realized, and the energy required for the operation is less than that of a conventional ultra-low-dew point air supply system as a whole in the dehumidification system. According to the inventors' calculations, when dry air having the same low dew point is supplied, the production cost can be reduced to 1/3 or less as compared with a conventional dehumidification system using an adsorption tower.

In the first embodiment, the return air from the low dew point space S in the atmosphere having the ultra low dew point is passed through the return air ducts 51, 52 and 53 to the first stage dry dehumidifier 1 respectively.
Since it is possible to return to the dehumidification inlet sides of the rotors 11, 21, 31 of the 0th and 2nd stage dry dehumidifiers 20 and the 3rd stage dry dehumidifier 30, the intake amount of outside air OA is reduced. be able to.

In this case, the rotor of the dry dehumidifier for returning the return air can be selected according to the dew point temperature of the return air by opening and closing the dampers D5 to D7. For example, when the dew point temperature of the return air is −70 ° C. or lower, the dew point temperature of the return air is −70 ° C. or more to the dehumidification inlet side of the rotor 31 of the third-stage dry dehumidifier 30.
At −30 ° C., the rotor 2 of the second-stage dry dehumidifier 20
To the dehumidification inlet side, return air with a higher dew point temperature is 1
By operating the first stage dry dehumidifier 10 to return to the dehumidification inlet side of the rotor 11, the first stage dry dehumidifier 10, 2
The size of each of the dry dehumidifiers 20 in the stage can be reduced. As a result, the size of the entire equipment can be reduced, and accordingly, the running cost can be reduced by reducing the energy consumption. In addition, efficient operation can always be performed.

In the dry dehumidification system according to the first embodiment, a part of the air from the regeneration fan 45 is supplied to the regeneration heater 44 as in the second embodiment shown in FIG. Return to the entrance side, that is, the regeneration area 21b
A part of the mixed air of the air passing through the purge section 21b and the air passing through the purge section 21b may be supplied to the regeneration section 21b again. With such a configuration, the regeneration air volume of the rotor 21 of the second-stage dry dehumidifier 20 is increased, and the capacity is improved.

In the dry dehumidification system according to the first embodiment, air that has passed through the purge section 21c of the rotor 21 of the second-stage dry dehumidifier 20 is mixed with air that has passed through the regeneration section 21b. This is set to 1 by the reproduction fan 45.
Although it was used for the regeneration of the rotor 11 of the dry dehumidifier 10 of the second stage, the dry dehumidifier 20 of the second stage was used instead of this, as in the third embodiment shown in FIG. The air that has passed through the purge section 21c of the rotor 21 is returned to the inlet side of the regeneration heater 44 by the regeneration fan 48, and all the air that has passed through the regeneration section 21b is supplied to the regeneration heater 46 by the regeneration fan 45. The first stage dry dehumidifier 10 may be configured to be guided to the regeneration area 11b of the rotor 11. According to the dry dehumidification system according to the third embodiment, the regeneration capability of the rotor 21 of the second-stage dry dehumidifier 20 is improved. In the figure,
The devices and members indicated by the same reference numerals as those used in the first embodiment are the same devices used in the first embodiment,
The members are shown. In the system diagrams of the systems according to the embodiments shown in FIGS. 8 to 10, illustration of dampers is omitted as appropriate.

In the first embodiment, part of the air that has passed through the dehumidifying section 31a of the rotor 31 of the third-stage dry dehumidifier 30 is used as the purge air, and all of the air of the third-stage rotor 31 is removed. Although it is used for regeneration, it may be configured as a dry dehumidification system according to the fourth embodiment shown in FIG. 9 instead.

In the dry dehumidification system according to the fourth embodiment shown in FIG. 9, a part of the air that has passed through the dehumidification section 31a is heated by the heater 41, and then guided to the regeneration section 31b of the rotor 31. The purge section 31c and the regeneration section 31b
May be mixed with each other and introduced into the regeneration section 21b of the rotor 21 of the second-stage dry dehumidifier 20 to be used for regeneration. In the case of the second embodiment, the amount of regeneration air used for regeneration of the second-stage rotor 21 and the first-stage rotor 11 can be increased.

Further, in the dry dehumidification system according to the fourth embodiment, as shown in FIG. 10, a part of the air from the regeneration fan 45 is returned to the inlet side of the regeneration heater 44. The fifth embodiment described above may be constructed. According to the fifth embodiment having such a configuration, the amount of regeneration air for the rotor 21 of the second-stage dry dehumidifier 20 is increased, and the capacity is improved.

[0046]

According to the dry dehumidification system of the present invention, air having an ultra-low dew point of -80 ° C. or less can be obtained using a dry dehumidification device with less energy and compact equipment than before. Can be manufactured. In particular, in the case of claim 6, since the inlet of the rotor to be returned is selected according to the dew point temperature of the return air, efficient operation can always be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing the configuration of a dry dehumidification system according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a rotor portion of a first-stage dry dehumidifier used in the dry dehumidifier system of FIG. 1;

FIG. 3 is a front view of the dry dehumidifier of FIG. 2 as viewed from an axial direction.

FIG. 4 is an explanatory diagram of the first-stage dry-type dehumidifier used in the experiment, as viewed from an axial direction of a rotor.

FIG. 5 is an explanatory diagram of the second-stage dry dehumidifier used in the experiment, as viewed from the axial direction of a rotor.

FIG. 6 is an explanatory view of the third-stage dry dehumidifier used in the experiment as viewed from the axial direction of a rotor.

FIG. 7 is an explanatory view schematically showing a configuration of a dry dehumidification system according to a second embodiment of the present invention.

FIG. 8 is an explanatory view schematically showing a configuration of a dry dehumidification system according to a third embodiment of the present invention.

FIG. 9 is an explanatory view schematically showing a configuration of a dry dehumidification system according to a fourth embodiment of the present invention.

FIG. 10 is an explanatory view schematically showing a configuration of a dry dehumidification system according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dry dehumidifier (1st stage) 11 Rotor 11a Dehumidification area 11b Regeneration area 11c Purge area 20 Dry dehumidifier (2nd stage) 21 Rotor 21a Dehumidification area 21b Regeneration area 21c Purge area 30 Dry dehumidifier ( 3rd stage) 31 Rotor 31a Dehumidification area 31b Regeneration area 31c Purge area D1 to D7 Damper S Low dew point space

Claims (6)

[Claims] 1. A dehumidifying system for supplying low dew point air to a target space, comprising a three-stage dry dehumidifying device that passes process air through a rotatable rotor to dehumidify the process air. The air dehumidified by the first-stage dry dehumidifier is connected in series, and the air dehumidified by the second-stage dry dehumidifier is dehumidified by the second-stage dry dehumidifier. The third stage dry dehumidifier is configured to dehumidify, and the passage area of the air located on the end face side of each rotor in each of the second stage and third stage dehumidifier is at least a dehumidification zone. And the purge section is divided into a purge section and a purge section, and the purge section is located before the transition from the regeneration section to the dehumidification section by rotation of the rotor. Part of the air that has passed through the area is transmitted to the rotor of the second stage dry dehumidifier. And the air that has passed through the purge zone is mixed with the air that has passed through the regeneration zone of the rotor of the second-stage dry dehumidifier to form the first-stage dry dehumidifier. A portion of the air that has been passed through the dehumidifying section of the rotor of the third-stage dry dehumidifier is configured to be introduced into the regeneration section of the rotor of the moistening apparatus. It is configured to be introduced into the purge zone, and the air that has passed through the purge zone is configured to be introduced into the regeneration zone of the rotor of the third-stage dry dehumidifier, and further the third stage. The dry dehumidification system, wherein the air that has passed through the regeneration zone of the rotor of the dry dehumidifier is introduced into the regeneration zone of the rotor of the second stage dry dehumidifier. 2. The air that has passed through the purge zone of the rotor of the second-stage dry dehumidifier is mixed with the air that has passed through the regeneration zone of the rotor of the second-stage dry dehumidifier, and the mixed air is mixed. Is configured to be introduced into the regeneration area of the rotor of the first-stage dry dehumidifier, and the remaining part is introduced into the regeneration area of the rotor of the second-stage dry dehumidifier. The dry dehumidification system according to claim 1, characterized in that: 3. A dehumidification system used to supply low dew point air to a target space, comprising a three-stage dry dehumidifier that passes processing air through a rotatable rotor to dehumidify the processing air. The air dehumidified by the first-stage dry dehumidifier is connected in series, and the air dehumidified by the second-stage dry dehumidifier is dehumidified by the second-stage dry dehumidifier. The third stage dry dehumidifier is configured to dehumidify, and the passage area of the air located on the end face side of each rotor in each of the second stage and third stage dehumidifier is at least a dehumidification zone. And the purge section is divided into a purge section and a purge section, and the purge section is located before the transition from the regeneration section to the dehumidification section by rotation of the rotor. Part of the air that has passed through the area is transmitted to the rotor of the second stage dry dehumidifier. And the air passing through the purge zone is introduced into the regeneration zone of the rotor of the second stage dry dehumidifier, and
The air that has passed through the regeneration section of the rotor of the first-stage dry dehumidifier is introduced into the regeneration section of the rotor of the first-stage dry dehumidifier. Is configured to be introduced into the purge section of the rotor of the third-stage dry dehumidifier, and that the air that has passed through the purge section is The air that passes through the regeneration section of the rotor of the third-stage dry dehumidifier is configured to be introduced into the regeneration section of the rotor of the second-stage dry dehumidifier. A dry dehumidification system, characterized in that it is adapted to be introduced into a regeneration zone of a rotor. 4. A dehumidification system for supplying low dew point air to a target space, comprising a three-stage dry dehumidifier that passes process air through a rotatable rotor to dehumidify the process air. The air dehumidified by the first-stage dry dehumidifier is connected in series, and the air dehumidified by the second-stage dry dehumidifier is dehumidified by the second-stage dry dehumidifier. The third stage dry dehumidifier is configured to dehumidify, and the passage area of the air located on the end face side of each rotor in each of the second stage and third stage dehumidifier is at least a dehumidification zone. And the purge section is divided into a purge section and a purge section, and the purge section is located before the transition from the regeneration section to the dehumidification section by rotation of the rotor. Some of the air passing through the zone may be introduced into the purging zone of the rotor. And the air that has passed through the purge zone is mixed with the air that has passed through the regeneration zone of the rotor of the second-stage dry dehumidifier to form a regeneration zone of the rotor of the first-stage dry dehumidifier. A portion of the air that has passed through the dehumidification area of the rotor of the third stage dry dehumidifier is configured to be introduced into the purge area of the rotor, and the dehumidification area A portion of the other air that has passed through is introduced into the regeneration zone of the rotor, and the air that has passed through the purge zone and the regeneration zone is mixed and regenerated into the regeneration zone of the rotor of the second stage dry dehumidifier. A dry dehumidification system, characterized in that it is adapted to be introduced. 5. The air that has passed through the purge zone of the rotor of the second stage dry dehumidifier is mixed with the air that has passed through the regeneration zone of the rotor of the second stage dry dehumidifier, and the mixed air is mixed. Is configured to be introduced into the regeneration area of the rotor of the first-stage dry dehumidifier, and the remaining part is introduced into the regeneration area of the rotor of the second-stage dry dehumidifier. The dry dehumidification system according to claim 4, characterized in that: 6. The return air is returned to the inlet side of the dehumidification area of the rotor of the first-stage, second-stage, or third-stage dry dehumidifier according to the dew point temperature of the return air from the target space. The dry dehumidification system according to any one of claims 1, 2, 3, 4, and 5, wherein the system is configured as follows.