JPH05200231A - Dry dehumidifier - Google Patents

Abstract

PURPOSE:To provide a dry dehumidifier having high dehumidifying efficiency over a range from a low humidity region to a high humidity region and excellent in dehumidifying capacity. CONSTITUTION:A dehumidifying rotor 8 is rotated and air 1 to be dehumidified is allowed to flow through a dehumidifying zone 8a during this rotation to adsorb and remove moisture by the dehumidifying rotor 8. Regenerating air after the heating due to a regeneration heater 6 is allowed to flow through a regeneration zone 8b to desorb moisture from the dehumidifying rotor 8a to regenerate the rotor 8a. When the humidity of the air 1 to be dehumidified is low, the rotational speed of the dehumidifying rotor 8 is decreased and, when the humidify of the air 1 to be dehumidified is high, the rotational speed of the dehumidifying rotor 8 can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry type dehumidifying device which utilizes the adsorption / desorption action of moisture on a honeycomb dehumidifying rotor.

[0002]

2. Description of the Related Art A dry dehumidifier is a device for reducing moisture (humidity) contained in air in a stable manner.
This dry dehumidifier is particularly useful because it can be used in a wide range from extremely low humidity to high humidity.

FIG. 1 is a block diagram showing the basic construction of a conventional dry dehumidifier. The dehumidified air 1 is a dehumidifying rotor 8 formed of a honeycomb adsorbent by a treatment blower 2.
Is sent to the dehumidifying zone 8a. As the dehumidified air 1 passes through the dehumidification zone 8a, the dehumidified air is dehumidified and the humidity is reduced, and the dehumidified air 3 is supplied to the air clean chamber or the like.

On the other hand, the dehumidifying rotor 8 after absorbing moisture moves to the regeneration zone 8b by its rotation. The outside air for regeneration 4 sent to the dehumidification rotor 8 by the regeneration blower 5 is heated by the regeneration heater 6 and then passes through the regeneration zone 8b of the dehumidification rotor 8. After passing through the dehumidifying rotor 8, the dehumidifying rotor 8
The air after dehumidifying the adsorbed moisture of is discharged to the outside of the system as regeneration exhaust 7. Then, the dehumidified dehumidifying rotor 8 moves to the dehumidifying zone 8a again to dehumidify the dehumidified air 1.

FIG. 2 shows an example of surface division of each processing zone of the dehumidifying rotor 8. As shown in FIG. 2, for example, the dehumidifying zone 8a is a region having a central angle of 270 ° and the regeneration zone 8b is a region having a central angle of 90 °.

FIG. 3 shows an example of dehumidification performance characteristics of the dry dehumidification device constructed as described above, where the treatment inlet air temperature is 25 ° C.
The case will be shown. That is, in FIG. 3, the horizontal axis is the absolute humidity of the processing inlet air, and the vertical axis is the absolute humidity of the processing outlet air. Further, FIGS. 4A, 4B, and 4C show the dehumidification performance characteristics. , The absolute humidity of the process inlet air is
The absolute humidity of the treatment outlet air of the dehumidifying rotor 8 in the case of 2 g / Kg, 10 g / Kg, and 18 g / Kg is shown with respect to the surface angle of the dehumidifying zone. The surface angle of the dehumidifying zone is 0 ° immediately after passing through the regeneration zone 8b and 270 ° immediately before entering the regeneration zone 8b.

As shown in FIG. 3, the conventional dry dehumidifier has a dehumidifying action in a wide range from low humidity to high humidity, but as shown in FIG. It has an outlet humidity characteristic that depends on the dehumidification zone surface angle. In this case, the dehumidifying rotor 8 immediately after coming out of the regeneration zone 8b has a high temperature due to the heating action due to the passage of the regeneration air, so the dehumidifying action is lowered. After that, the dehumidifying rotor 8 advances through the dehumidifying zone 8a, receives a cooling action by the process inlet air, and exhibits the most excellent dehumidifying performance at the time of being sufficiently cooled. Next, the dehumidifying performance gradually deteriorates as the adsorbed moisture of the honeycomb-shaped adsorbent constituting the dehumidifying rotor 8 accumulates.

However, in the case of low humidity [Fig.
In (a)], there is still an adsorption surplus just before entering the regeneration zone 8b, whereas in the case of high humidity [Fig.
In (c)], the dehumidification performance is greatly reduced immediately before entering the regeneration zone 8b. Therefore, when the humidity is high, the dehumidifying rotor 8 needs to be rotationally moved to the regeneration zone 8b earlier.

Therefore, the dehumidification efficiency (outlet humidity / inlet humidity × 100) in the case of low humidity in FIG. 4 (a) is 82.5%.
On the other hand, in the case of the high humidity shown in FIG. 4 (c), the dehumidification efficiency has dropped to 42.2%. Furthermore, as a technique for improving the conventional defects, a purge zone 8c having a central angle of about 90 ° is provided on the upstream side of the dehumidifying zone 8a (see FIG. 6), and common to FIGS. 4 (a) to 4 (c). As can be seen, it can be considered that the adsorbent immediately after passing through the regeneration zone has an insufficient dehumidifying ability, and the adsorbent is cooled by the purge gas and introduced into the dehumidifying zone 8a at a low temperature. As a result, the influence of the passage of the regeneration zone 8b on the dehumidification processing of the dehumidification zone 8a is blocked, and the heat of the dehumidification rotor after passing through the regeneration zone 8b is also collected, and the air after passing through this purge zone is used as regeneration air. Can be used. However, even in this case, the deterioration of the dehumidification performance due to the difference in adsorption amount between low humidity and high humidity has not been improved.

[0010]

As described above, in the conventional dry dehumidifying device, each process is performed by rotating the dehumidifying rotor at a constant speed irrespective of the difference in the adsorption amount at low humidity and high humidity. Since the process is carried out, the above-mentioned characteristic defect such as deterioration of dehumidification performance occurs. Also, in the low humidity region, excessive energy is used to excessively regenerate the dehumidifying rotor, while in the high humidity region, the energy required for complete regeneration cannot be input and regeneration of the dehumidifying rotor is insufficient. Dehumidification performance is supposed to deteriorate.

The present invention has been made in view of the above problems, and provides a dry dehumidifying device capable of improving dehumidification efficiency over a wide range from a low humidity region to a high humidity region and saving energy in processing. The purpose is to provide.

[0012]

A dry dehumidifying apparatus according to the present invention comprises an adsorption step of rotating a honeycomb dehumidifying rotor and adsorbing moisture in dehumidified air to the dehumidifying rotor during the rotation. In a dry dehumidifying device that alternately repeats at least two steps of a desorption regeneration step of desorbing moisture by heating the dehumidifying rotor, in a low humidity region where the moisture content in the dehumidified air is low, In a high humidity region where the moisture content is high, the rotation speed of the dehumidification rotor is controlled at high speed in accordance with the moisture content of the dehumidified air.

[0013]

In the present invention, the rotor rotation speed is lowered below the standard at low humidity. As a result, the dehumidification rotor immediately after passing through the regeneration zone receives the flow of the dehumidified air in the dehumidification zone for a relatively long time, and the high temperature portion of the dehumidification rotor immediately after passing through the regeneration zone remains in the dehumidification zone. The temperature of the air to be dehumidified is sufficiently lowered by receiving the cooling action by the flow of the air to be dehumidified, and then the air to be dehumidified is dehumidified in this dehumidification zone. At low humidity, even if the rotor rotation speed is slowed in this way, the moisture adsorption reserve capacity of the rotor is sufficient and no inconvenience occurs, while the time required for cooling the rotor can be secured.

In this way, as shown in FIG. 4 (a), it is possible to reduce the portion where the dehumidifying capacity becomes insufficient due to the high temperature of the dehumidifying rotor immediately after passing through the regeneration zone. As a result, the dehumidifying performance of the whole (processed dehumidified air) is improved, but since the passage time through the regeneration zone is extended, a smaller amount of regenerated air is sufficient, and the required heat amount of the regeneration heater is reduced. Accordingly, energy saving can be achieved.

At high humidity, since the saturated adsorption amount of the adsorbent per unit time is increased by increasing the rotor rotation speed, highly efficient dehumidification can be performed even at high humidity.

In this case, the dehumidifying rotor is at a high temperature immediately after regeneration by providing a purge zone on the upstream side of the dehumidifying zone (that is, on the downstream side of the regeneration zone) for introducing outside air into the dehumidifying rotor. It is possible to eliminate the poor dehumidifying action caused by the above. Further, by recovering the heat retained by the dehumidifying rotor into the passing gas in this purge zone after the passage through the regeneration zone and using the gas after passing through the purge zone as at least a part of the regeneration gas,
A part of the heat quantity given to the dehumidifying rotor in the regeneration zone can be recovered and used effectively.

By the way, as the rotor rotation speed increases,
Although it is better to increase the amount of regenerated heat, when the purge zone is provided, heat can be sufficiently recovered as described above, so even if the amount of regenerated air is increased as the number of revolutions increases, no energy is required. However, the effect of improving the dehumidification efficiency is increased.

[0018]

The characteristics of a dry dehumidifier according to an embodiment of the present invention will be described below in comparison with a conventional dry dehumidifier.

First, regarding the dry dehumidifier of this embodiment,
This will be described with reference to the block diagram of FIG. This dry dehumidifier differs from the dry dehumidifier shown in FIG. 1 in that a purge zone 8c is provided outside the dehumidification zone 8a and the regeneration zone 8b in the rotation region of the dehumidification rotor 8. Then, the outside air 4 for regeneration is first passed through the dehumidification rotor 8 in the purge zone 8c, and the air after passing through the purge zone 8c is heated by the regeneration heater 6 and passed through the dehumidification rotor 8 in the regeneration zone 8b by the regeneration blower 5. Is configured. As a result, the dehumidifying rotor 8 passes through the regeneration zone 8b and is heated by the regeneration gas, and then receives the outside air 4 for regeneration having low humidity and low humidity in the purge zone 8c and remains after passing through the regeneration zone. The water is removed and the water is cooled. Therefore, the dehumidifying rotor 8 enters the dehumidifying zone 8a with a high hygroscopic effect.

In the present embodiment, the rotation speed of the dehumidifying rotor 8 is changed according to the humidity of the process inlet air, that is, the dehumidified air. That is, when the humidity of the dehumidified air is high, the rotation speed of the dehumidification rotor 8 is increased, and when the humidity is low, the rotation speed of the dehumidification rotor 8 is decreased. This may change the rotor rotation speed continuously or in proportion to the humidity of the dehumidified air, or by setting a plurality of rotor rotation speeds,
The optimum rotor rotation speed may be selected according to the humidity of the dehumidified air. Further, based on the fact that the regeneration zone passage time changes according to the rotation speed of the dehumidifying rotor, the amount of regeneration air, which is one of the heat amounts for regeneration, can also be changed to the required amount. That is, when the rotation speed of the rotor is high, the amount of regenerated air is increased, and when it is low, it is decreased. As a result, it is possible to dehumidify from a low humidity region to a high humidity region with high efficiency, and it is possible to save energy.

Next, as described above, regarding the effect of changing the rotation speed of the dehumidifying rotor according to the humidity of the dehumidified air, the embodiment of the present invention and the conventional example in which the rotor rotation speed is constant as in the conventional case are described. Will be described in comparison. The processing conditions are as shown in Table 1 below. The heat recovery efficiency and dehumidification efficiency are shown in Table 2 below.

[0022]

[Table 1]

[0023]

[Table 2]

In the conventional example, the dehumidifier shown in FIG. 1 is used, and the rotor driving speed is constant at 18rpH. On the other hand, the embodiment is shown in FIG.
Using the dehumidifier having the purge zone shown in (1), the rotor driving speed was adjusted or controlled according to the treatment inlet air humidity. In the case of the embodiment of the present invention, not only the dehumidification performance is significantly improved, but also the energy saving effect associated with the reduction of the regeneration heater by adjusting or controlling the regeneration air volume is great.

[0025]

According to the present invention, since the dehumidifying rotor is rotated at a rotation speed suitable for the humidity of the dehumidified air, the dehumidifying performance can be greatly improved.

Further, by providing a purge zone,
Avoid deteriorating the dehumidifying performance of the dehumidifying rotor at high temperature,
Furthermore, the heat during regeneration can be recovered. Furthermore, an energy saving effect can be obtained, and a useful dry dehumidifying device can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a dry dehumidifier.

FIG. 2 is a schematic diagram showing a division mode of the dehumidifying rotor.

FIG. 3 is a graph showing an example of dehumidification performance.

4A to 4C are graphs showing a relationship between humidity of dehumidified air and a position of a dehumidifying rotor and dehumidifying performance in a dehumidifying zone.

FIG. 5 is a block diagram of a dry dehumidifier.

FIG. 6 is a schematic diagram showing a division mode of the dehumidifying rotor.

[Explanation of Codes] 1; Dehumidified air 3; Dehumidified air 4; Regeneration outside air 7; Regeneration exhaust 8; Dehumidification rotor 8a; Dehumidification zone 8b; Regeneration zone 8c; Purge zone

Claims (3)

[Claims] 1. A honeycomb-type dehumidifying rotor is rotated, an adsorption step of adsorbing moisture in dehumidified air to the dehumidifying rotor during this rotation, and a desorption regeneration for desorbing moisture by heating the dehumidifying rotor. In a dry dehumidifying apparatus that alternately repeats at least two steps with a step, in a low humidity region where the moisture content of the dehumidified air is low, it is low, and in a high humidity region where the moisture content is high, it is high, A dry dehumidifying device, characterized in that the rotation speed of the dehumidifying rotor is controlled in accordance with the moisture content of the dehumidified air. 2. Corresponding to the number of revolutions of the dehumidifying rotor,
The dry dehumidification device according to claim 1, wherein the air volume of the regeneration air flowing through the dehumidification rotor is controlled in the regeneration step. 3. A dehumidification zone for dehumidified air, a regeneration zone for the dehumidification rotor, and a purge zone for the dehumidification rotor are provided in order of the rotation direction of the dehumidification rotor, and a part or all of the air passing through the purge zone is passed through the regeneration zone. The dry dehumidifying device according to claim 1 or 2, wherein the dry dehumidifying device is used as regenerated air to be supplied.