JP2659652B2 - Dry dehumidifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low dew point type dry dehumidifier for dehumidifying indoor air such as an environmental test room, and more particularly, to dehumidifying low humidity air having a water content of 10 g / kg 'or less. The present invention relates to a dry-type dehumidifying device suitable for performing the method.

[0002]

2. Description of the Related Art Recently, with the increase of devices equipped with electronic components, there has been an increasing demand for testing the use characteristics of these devices in various environments. Therefore, the demand for an environmental test room is increasing. . In particular, in many cases, tests under low temperature and low humidity are required.

The low-temperature and low-humidity conditions are, for example, a temperature of 5
℃, relative humidity 5%. In this condition, the humidity was reduced to about 1/50 as compared with normal atmospheric conditions. Conventionally, as a dehumidifier to achieve such conditions,
2. Description of the Related Art A dry dehumidifier is used, and in particular, a demand for a low dew point type dry dehumidifier having excellent dehumidifying efficiency is increasing.

FIG. 5 is a block diagram showing a conventional low dew point type dry dehumidifier. After being cooled by the cooler 2, the processing air is sent into the dehumidification processing zone 1 a of the rotor 1 made of the honeycomb dehumidifying material by the processing fan 3. Then, the processing air passes through the dehumidification zone 1a and is dehumidified. The dehumidified air exiting the dehumidification processing zone 1a is supplied to the environmental test room 10. On the other hand, a part of the air that has exited the environmental test chamber 10 is returned to the upstream side of the processing fan 3, and an air circulation loop is formed.

A part of the cooled processing air sent to the rotor 1 by the processing fan 3 is introduced into the purge zone 1c of the rotor 1. Thus, the rotor 1, which has been heated to a high temperature in the regeneration zone 1b, is cooled in the purge zone 1c before entering the dehumidification zone 1a, so as to be ready for adsorption in the next step.

[0006] After passing through the purge zone 1c, the air is sent to the heater 5 by the regeneration fan 4 to be heated, and then supplied to the regeneration zone 1b of the rotor 1. Thus, while the rotor 1 is passing through the regeneration zone 1b, the rotor 1 is heated by the heated air to desorb and remove the adsorbed moisture.

As described above, while the rotor 1 rotates at a constant speed, the rotor 1 dehumidifies the processing air in the dehumidification processing zone 1a, and the heated air removes moisture in the regeneration zone 1b to be dehumidified. Then, after being cooled in the purge zone 1c, the processing air is again dehumidified in the dehumidification processing zone 1a. Thereby, dry air after dehumidification is continuously supplied to the environmental test chamber 10.

[0008]

As described above, in the conventional dry dehumidifier, each process is performed by rotating the dehumidifier rotor at a constant speed regardless of the difference in the inlet humidity between extremely low humidity and high humidity. It is usual that the process is performed. Therefore, in the low-humidity region, excessive energy is used to regenerate the dehumidifying rotor excessively, but in the high-humidity region, the energy required for complete regeneration cannot be supplied, and the regeneration of the dehumidifying rotor is insufficient. However, the dehumidifying performance is degraded.

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

[0010]

According to the present invention, there is provided a dry dehumidifier comprising: a rotor made of a honeycomb-shaped dehumidifier; a driving means for rotating the rotor around its central axis at a rotational speed of 3 to 12 rph; Division means for dividing the rotation passage area of the rotor into at least a dehumidification processing zone, a regeneration pretreatment zone, a regeneration processing zone, and a purge zone in this order, and processing air introduction means for passing processing air to the rotor in the dehumidification processing zone. Heating means for introducing regeneration air into the regeneration pretreatment zone, purge air introduction means passing the purge air through the purge zone, and heating the air passing through the regeneration pretreatment zone. And a heating air introducing means for regeneration introduced into the regeneration processing zone, and before being introduced into the regeneration pretreatment zone.
Cooling means for pre-cooling the recording air .

[0011]

In the present invention, the outside air for regeneration is first introduced into the cooler to cool and dehumidify the outside air for regeneration. Next, the dehumidified air is introduced into a regeneration pretreatment zone and a purge zone, and the dehumidification rotor dehumidifies the regeneration air. Then, after the dehumidified air is heated, the dehumidification air is heated and then regenerated. And heats the rotor by passing through the rotor in the regeneration processing zone to desorb moisture adsorbed on the rotor. After the regeneration process, the rotor is cooled by receiving the purge gas in the purge zone and cooled to a low temperature having a high adsorption efficiency, and then dehumidifies the processing air in the dehumidification zone.

The outside air for regeneration, which heats the rotor in the regeneration treatment zone to desorb moisture, passes through the regeneration preliminary treatment zone and the purge zone and is previously dehumidified.
It is low-humidity air, and the rotor has excellent moisture desorbing action. In addition, since moisture is desorbed by the dehumidified outside air in this manner, the humidity of the processing air is low, and even when the processing air in the low humidity range is dehumidified, the dehumidification can be performed with high efficiency.

Further, by heating the purge gas that has passed through the purge zone and then supplying the heated purge gas to the regeneration processing zone, the heat retained by the rotor recovered in the purge gas in the purge zone is reduced by the rotor in the regeneration processing zone. The heating energy of the regeneration air can be reduced accordingly.

Thus, in the present invention, the central angles of the pre-reproduction processing zone and the reproduction processing zone are set to 30 to 80, respectively.
It is preferable to set the angle to 60 ° and 60 to 120 °.

FIG. 6 shows the air humidity at the outlets of the purge zone and the processing zone in the conventional dehumidifier shown in FIG. 5 on the vertical axis, and the horizontal axis shows the rotor surface angle (the angle between the center of the rotor and the entrance of the purge zone relative to the center of the rotor). FIG. 4 is a graph showing changes in the air humidity at the outlet. FIG. 6 shows data when the center angle of the purge zone is 90 °, the center angle of the dehumidification zone is 180 °, and the center angle of the regeneration zone is 90 °. The total air volume at the inlet of the air introduced into the purge zone and the dehumidification zone is 600 m ³ / hour, and the air temperature at the inlet is 10 ° C. Further, the surface wind speed on each rotor surface was equal to 2 m / sec, and the rotation speed of the rotor was 9 rpH in accordance with the inlet humidity of 2 g / kg, and the rotation speed was lower than usual.

In the purge zone, the outlet air temperature was 80 ° C. or higher at a surface angle of 45 °, but as shown in FIG. 6, the air humidity at the outlet was sufficiently reduced and the dehumidifying performance was high. For this reason, from the viewpoint of preventing the dehumidification performance from deteriorating due to the high temperature of the dehumidification rotor, providing a purge zone with a central angle of 90 ° results in excessive purging. An appropriate range of the purge zone is 10 to 30 ° in the case of dehumidification in a low humidity range. The central angle of this purge zone is
If the angle is less than 10 °, the dehumidification rotor enters the dehumidification processing zone at a relatively high temperature, and the dehumidification performance deteriorates. On the other hand, if the center angle of the purge zone exceeds 30 °, when the humidity of the air to be dehumidified is low, the area of the purge zone through which the purge gas having a higher humidity than the air to be dehumidified flows becomes too large, The contamination of the rotor by the purge gas cannot be ignored. As a result, even if moisture is sufficiently desorbed from the rotor in the regeneration processing zone, the rotor entering the dehumidification processing zone contains moisture, and the dehumidification performance is degraded. For this reason, the central angle of the purge zone is
It is desirable to set it to 10 to 30 °.

The regeneration pretreatment zone allows regeneration outside air to pass therethrough, during which the regeneration outside air is dehumidified. This is because when the air to be dehumidified has a low humidity, the amount of water adsorbed on the rotor in the dehumidification processing zone on the upstream side is small, so that the adsorbing power is sufficiently high. Therefore, in the present invention, the air used for the regeneration of the rotor is passed through the regeneration pretreatment zone, the dehumidification by the rotor is performed, and the dried and heated state is supplied to the regeneration treatment zone to regenerate the rotor. Offer. Thereby, since the moisture adsorbed on the rotor is desorbed by the low-humidity air, the air to be dehumidified can be dehumidified with high efficiency.

In this case, if the central angle of the regeneration pretreatment zone is too small, less than 30 °, the dehumidification of the regeneration air becomes insufficient, and the regeneration air having a low humidity required for low-humidity regeneration is supplied. become unable. On the other hand, if the central angle of the regeneration pretreatment zone exceeds 80 °, the humid outside air will flow through the rotor unnecessarily over a wide range, and the dehumidification treatment zone becomes relatively narrow, The dehumidifying ability of the device decreases. For this reason, it is desirable that the center angle of the regeneration pretreatment zone be 30 to 80 °.

Further, the regeneration zone is a region in which the adsorbed rotor is heated and regenerated. If the center angle of the regeneration zone is less than 60 °, the rotor cannot be sufficiently regenerated. This leads to deterioration of dehumidifying performance. on the other hand,
If the stop angle of the regeneration processing zone exceeds 120 °, the area of the dehumidification processing zone becomes relatively narrow, and the capacity of the dehumidification processing decreases. For this reason, it is desirable that the central angle of the reproduction processing zone be 60 to 120 °. The central angle of the dehumidification zone is the remaining area of each of these zones.

As described above, there is an appropriate condition range for dehumidifying low-humidity air having a water content of 10 g / kg 'or less, but the rotation speed of the rotor rotationally driven by the driving means is 3 to 3 g / kg'. It is limited to 12 rpH, and in this range, the rotation speed can be controlled according to the moisture content of the processing air. That is, when the humidity is low, the rotor rotation speed is made lower than the standard. 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. At low humidity, even if the rotor rotation speed is reduced in this way, the rotor has sufficient moisture adsorption capacity, and no inconvenience occurs.On the other hand, since the passage time in the regeneration zone is increased, a smaller amount of regeneration air is required. The regeneration of the honeycomb-shaped dehumidifying rotor becomes possible, and the required amount of heat of the regeneration heater is reduced, whereby energy saving can be achieved. At high humidity, the rotational speed of the rotor is increased from the standard to increase the saturated adsorption amount of the adsorbent per unit time. Therefore, even at high humidity, high dehumidifying efficiency can be obtained.

Next, the reason for limiting the rotor rotation speed to 3 to 12 rpH will be described. If the number of rotations of the rotor is made slower than necessary, the adsorption capacity of the adsorbent in the dehumidification processing zone becomes saturated, and conversely, the dehumidification efficiency deteriorates. Therefore, the minimum value of the rotation speed is 3 rph. On the other hand, when the rotation speed is increased, the passage time in the regeneration processing zone is shortened, and it becomes necessary to supply more regeneration air as necessary material desorption energy. Further, in such a state, after passing through the regeneration treatment zone, it is extremely severe that the temperature of the material itself falls during the passage through the dehumidification treatment zone until it reaches a temperature at which sufficient dehumidification efficiency can be exhibited. Therefore, the upper limit of the number of revolutions is set to 12 rph.

By the way, as the rotor rotation speed increases,
There is a need to increase the regeneration air volume. In this case, in the present invention, the heat amount from the rotor that has exited the regeneration processing zone is recovered in the purge zone in the purge air, and this purge air is used as a part of the regeneration air introduced into the regeneration zone. In this way, effective use of heat is achieved. For this reason, even if the air volume of the regeneration air is increased as the rotation speed increases, the heat energy required for heating the regeneration air does not increase, and the effect of improving the dehumidifying efficiency can be obtained at low cost.

[0023]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a dry dehumidifier according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a divided mode of the rotor. The rotor 11 is connected to the dehumidification processing zone 11.
a, regeneration preliminary processing zone 11b, regeneration processing zone 11
c, divided into four parts in a purge zone 11d. As shown in FIG. 2, the dehumidification zone 11a has the widest central angle of 180 °, and the regeneration pretreatment zone 11b has a central angle of, for example, 180 °.
65 °, the central angle of the reproduction processing zone 11c is, for example, 90 °,
The purge zone 11d has a central angle of, for example, 25 °. The width of each zone may be appropriately set within the above-described appropriate range in consideration of the processing amount and the like.

The air to be dehumidified is sent to a first cooler 13 by a processing blower 12 and the first cooler 1
Cooled by 3. Then, the cooled processing air is supplied to the dehumidification processing zone 11a, and passes through the rotor 11 in the dehumidification processing zone 11a to be dehumidified. The air after the dehumidification treatment is supplied to a dry air use source such as an environmental test room (not shown).

On the other hand, the outside air for regeneration is cooled by the second cooler 14, and then supplied to the regeneration pretreatment zone 11b and also to the purge zone 11d. And
The regeneration pretreatment zone 11b and the purge zone 11d
Are passed and are fed into the heat exchanger 16 by the regeneration blower 17. This air undergoes heat exchange in the heat exchanger 16, rises in temperature, is further heated by the regeneration heater 15, and is supplied to the regeneration processing zone 11 c. In the regeneration treatment zone 11c, the rotor 11 is heated by the heated air, and the adsorbed moisture is desorbed. The heated air that has passed through the regeneration processing zone 11c is then supplied to the heat exchanger 16, where the heat exchange is performed with the air sent to the regeneration heater 15, and the air before the regeneration processing is heated. . The heated air discharged from the heat exchanger 16 is discharged into the atmosphere as regeneration exhaust.

In the dry dehumidifier constructed as described above, the rotor 11 passes through the dehumidification zone 11a, the regeneration preliminary zone 11b, the regeneration zone 11c, and the purge zone 11d in this order. At 11a, moisture in the treated air is removed by adsorption. Since the processing air is cooled in advance by the cooler 13, the temperature is low and the dehumidifying efficiency of the rotor 11 is high. In this embodiment, the cooler 13 is provided.
This is unnecessary in the case of an environmental test room used at a low temperature, and it is only necessary to cool and dehumidify the outside air and take in only the quantitative ventilation air required in the environmental test room. And the rotor 11
Dehumidifies the outside air for regeneration in the regeneration pretreatment zone 11b, so that the heating air for regeneration which is heated after passing through the regeneration pretreatment zone 11b and introduced into the regeneration treatment zone has low humidity air conditions suitable for regeneration. .

Next, the rotor 11 is moved to the regeneration processing zone 11.
c, and receives the flow of the high-temperature and low-temperature regeneration heating air heated by the heater 15. Thereby, the rotor 11 is heated, and the adsorbed moisture is sufficiently desorbed.
The regenerated air containing the moisture is exhausted to the atmosphere after a part of the retained heat is used for heating the regenerated air in the heat exchanger 16. On the other hand, the rotor 11 is cooled by receiving the flow of low-temperature and low-humidity air from the cooler 14 in the purge zone 11d and dehumidifies this air to some extent, so that the air after passing through the purge zone 11d is reduced. The heat applied in the regenerating zone is recovered after being moistened and the temperature is raised, so that air conditions suitable for regenerating are obtained. Thereafter, the rotor 11 performs the dehumidification processing of the processing air in the dehumidification processing zone 11a.

In this way, the processing air is continuously dehumidified by the rotation of the rotor 11. In this embodiment, since the rotor 11 is cooled in the purge zone 11d, the dehumidification efficiency in the dehumidification processing zone 11a is high. The air discharged from the regeneration pretreatment zone 11b is air from which moisture in the regeneration outside air has been dehumidified to some extent. Therefore, the reproduction efficiency in the reproduction processing zone 11c is also high.

Further, the high-temperature air after the regenerating process exchanges heat with the low-temperature air before the regenerating process in the heat exchanger 16 and gives the remaining heat to the regenerating air before the regenerating process.
The capacity of 5 is enough about half of the heat required for regeneration. Furthermore, the regeneration zone 1 is located adjacent to the dehumidification zone 11a.
Since 1c is not provided, the high-temperature regenerated gas does not enter the dehumidification zone 11a, and the dehumidification efficiency can be maintained high.

In this embodiment, the rotation speed of the dehumidifying rotor 11 is appropriately set according to the humidity of the processing inlet air, that is, the air to be dehumidified. That is, when the humidity of the air to be dehumidified is high, the rotation speed of the dehumidification rotor 11 is increased, and when the humidity is low, the rotation speed of the dehumidification rotor 11 is decreased. This may be performed by continuously or proportionally changing the rotor rotation speed in accordance with the humidity of the air to be dehumidified, or by setting a plurality of rotor rotation speeds and setting the optimum value in accordance with the humidity of the air to be dehumidified. The rotor speed may be selected.

Further, by changing the passage time of the regeneration zone in accordance with the rotation speed of the dehumidifying rotor, the amount of air for regeneration, which is one of the amounts of heat for regeneration, can be changed to the required amount. That is, when the rotation speed of the rotor is high, the amount of the regenerated air is increased, and when the rotation speed is low, the amount is reduced. Thereby, it is possible to efficiently dehumidify from a low humidity region to a relatively high humidity region, and to save energy.

Next, the effect of changing the rotation speed of the dehumidifying rotor in accordance with the humidity of the processing inlet air as described above will be described by comparing the embodiment of the present invention with a comparative example in which the rotor rotation speed is constant. I do. Each processing condition is as shown in Table 1 below. Table 2 below shows the heat recovery efficiency and dehumidification efficiency.

As shown in the embodiment of the present invention, when the dehumidification inlet air humidity is 10 g / kg 'or less and the dehumidification is performed in a low-humidity region, the rotor rotation speed is in a range of 3 to 12 rpH which is lower than usual. Thus, high-efficiency dehumidification can be obtained, but if the inlet humidity is Ag / kg 'and the rotor speed is BrpH, the efficiency can be further improved by setting the rotor speed within the range of A <B <3A. As described above, the reason for each limitation is that in the case of A> B, the dehumidification rotor receives the flow of the air to be dehumidified for a relatively long time in the dehumidification zone. It becomes difficult to obtain efficiency. Further, in the case of B> 3A, the dehumidifying efficiency is not improved for a large amount of energy for dehumidifying material regeneration.

[0035]

[Table 1]

[0036]

[Table 2]

In the comparative example, the dehumidifier shown in FIG. 1 was used, and the rotation speed of the rotor was constant at 18 rpH. On the other hand, in the embodiment, the rotor drive speed was adjusted or controlled according to the processing inlet air humidity. In the case of the embodiment of the present invention, in addition to the remarkable improvement of the dehumidifying performance, the energy saving effect accompanying the reduction of the regeneration heater by adjusting or controlling the regeneration air volume is also great.

[0038]

According to the present invention, since the regeneration pretreatment zone is provided outside the regeneration treatment zone, the low humidity circulating air circulating between the environmental test chamber or the like and the rotor is supplied to the outside air for regeneration. Therefore, it is not necessary to use a large-sized apparatus having high dehumidifying efficiency as in the related art. Therefore, the size and cost of the dehumidifying device itself can be reduced, and the dehumidification can be performed without being affected by the outside air, so that the performance can be stabilized. Further, since the dehumidification rotor is rotated at a rotation speed suitable for the humidity of the air to be dehumidified, the dehumidification performance can be significantly improved. Further, by adjusting the regeneration air volume, the required heat amount of the regeneration heater can be reduced, and the energy saving effect is large.

[Brief description of the drawings]

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

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

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

FIGS. 4A to 4C are graphs showing the relationship between the humidity of the air to be dehumidified in the dehumidification zone, the position of the dehumidification rotor, and the dehumidification performance.

FIG. 5 is a block diagram showing a conventional dry dehumidifier.

FIG. 6 is a graph showing outlet humidity of a purge zone and a dehumidification processing zone of a conventional dry dehumidifier.

[Explanation of symbols]

 10; environmental test chamber 11; rotor 11a; dehumidification treatment zone 11b; regeneration pretreatment zone 11c; regeneration treatment zone 11d; purge zones 12, 17; blowers 13, 14; cooler 15; heater 16;

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-68523 (JP, A) JP-A-54-42840 (JP, A) JP-A-59-76521 (JP, A) 38214 (JP, A)

Claims (4)

(57) [Claims] 1. A rotor made of a honeycomb-shaped dehumidifying material, driving means for rotating the rotor around its central axis at a rotation speed of 3 to 12 rph, and a rotation passage area of the rotor at least in a dehumidification processing zone. Pretreatment zone,
Dividing means for dividing the processing air into the regeneration processing zone and the purge zone in this order; processing air introducing means for passing the processing air through the rotor in the dehumidification processing zone; and regeneration air for introducing the regeneration air into the regeneration preliminary processing zone. Introduction means,
A purge air introduction means for passing a purge air to the purge zone, after heating the air passing through the reproduction pretreatment zone, a regeneration heated air introduction means for introducing into the reproduction processing zone, the reproduction pretreated Introduced to the zone
Cooling means for pre-cooling the regeneration air to be used. 2. When the rotation speed of the dehumidification rotor is high, a large air volume is used. When the rotation speed is low, a small air volume is used. The dry dehumidifier according to claim 1, wherein the amount of air when passing through the regeneration zone is controlled. 3. The dry dehumidifier according to claim 1, wherein the purge gas introducing means introduces the regeneration air cooled by the cooling means into the purge zone. 4. The apparatus according to claim 3, wherein the heating air introducing means for regeneration heats the air that has passed through the purge zone and the regeneration pretreatment zone, and then introduces the air into the regeneration treatment zone. Dry dehumidifier.