JP3485161B2 - Dehumidification system - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a dehumidification system for supplying low dew point air to a low dew point chamber.

[0002]

2. Description of the Related Art Conventionally, as a method of producing low dew point air, for example, a method using an adsorption tower called a pressure swing method is known. This is a method in which the raw material air is compressed by a compressor to once 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 of using this method, the water concentration is, for example, 10 to 10
It is possible to reduce the temperature to 20 ppb (the dew point temperature is −101 ° C. to −98 ° C.), and so-called ultra-low dew point air of −80 ° C. or less can be obtained. Further, since the low dew point air produced by this method has a high pressure, it can be directly supplied to a production apparatus or the like. On the other hand, the pressure swing method requires a large amount of power for compressing air, and since compressed air is used for regeneration, operating costs (running costs) increase.

In order to improve these, a method of manufacturing ultra-low dew point air by arranging a plurality of dry dehumidifying devices using adsorption rotors in the middle of a supply duct for supplying low dew point air to a low dew point chamber is also proposed. ing. The dry dehumidifier is equipped with a honeycomb rotor impregnated with an absorbing liquid such as lithium chloride or calcium chloride, and a rotor composed of an adsorbent such as silica gel or zeolite. The air passage area located at the end face of this rotor Is divided into a dehumidification zone and a regeneration zone, and while the rotor is rotated, the treated air is passed through the rotor in the dehumidification zone to produce dry air, and the hot regeneration air is passed through the rotor in the regeneration zone. The moisture in the adsorbent is evaporated into the regenerated air to continuously reduce the humidity. By using a plurality of such dry dehumidifiers, the operating cost can be considerably reduced.

[0004]

However, even when such a plurality of dry dehumidifiers are used, it is desirable to further reduce the operating cost. Therefore, in order to achieve further reduction in operating costs, the low dew point air used once in the low dew point chamber is returned to the supply duct through the return air duct, dehumidified, and then supplied again to the low dew point chamber. Attempts have also been made to reuse low dew point air. According to this method, the operating cost can be considerably reduced by reusing the low dew point air.

However, in this way, the low dew point air is reused.
Fan installed in each duct or dry dehumidifier
Through the air with a high dew point such as the atmosphere in the machine room
May enter the system and reduce the performance of the low dew point chamber.
Occurs. According to a study conducted by the present inventors, this
If low dew point air is reused by the
Even if you use ct.
There is, for example, the absolute humidity in the machine room is 20g / kg(Dry
Clean air (DA)), Dew point temperature of return air is -50 ℃
(0.024g / kg(DA)) When you come back with
The air coming in is20 x 0.005 + 0.024 x 0.995 = 0.1
24g / kg (DA) (dew point temperature -36 ° C) The dew point temperature increased by 14 ° C.

Further, conventionally, a blower is not provided in the return air duct for returning the low dew point air from the low dew point chamber into the supply duct, and the return air of the low dew point air is provided exclusively in the supply duct. It was done by sucking with a fan of a dry dehumidifier. It is considered reasonable to return air of low dew point air with a fan of a dry dehumidifier in this way in terms of equipment costs and maintenance points, but the air around the duct is negative in the return air duct that has become negative pressure. I am worried about entering. In this case, it is complicated to improve the airtightness of the return air duct with a sealant, etc. Moreover, if it is attempted to completely prevent the air around the duct from entering the return air duct by using all the welding ducts, The cost has risen and a great deal of effort has been required to ensure the accuracy of enforcement.

It is an object of the present invention to provide a dehumidification system that can efficiently produce low dew point air at a lower operating cost.

[0008]

In order to solve the above problems, in the present invention , a low dew point chamber which is maintained in a low dew point atmosphere, and a supply path for supplying low dew point air to the low dew point chamber are provided. ，
A dehumidification system comprising a plurality of dehumidifiers arranged in a supply path, wherein a return air path for returning low dew point air in a low dew point chamber is provided in the supply path between the plurality of dehumidifiers. It is characterized in that a blowing means for blowing the low dew point air in the low dew point chamber is arranged in the low dew point chamber in the return air path. In addition, in the present invention, a low dew point atmosphere is maintained.
Low dew point chamber and supply diameter for supplying low dew point air to the low dew point chamber
And a dehumidifier with multiple dehumidifiers arranged in the supply line
A humidity system between the plurality of dehumidifiers
A return air path that returns the low dew point air in the low dew point room is installed in the supply path.
At the same time, the low dew point air in the low dew point chamber is sent into the return air path.
A ventilation means is provided to blow air into the room, and a return air chamber is provided adjacent to the low dew point chamber.
The chamber is formed and the air is sent into the return air chamber.
It is characterized by arranging wind means.

In the dehumidifying system of the present invention , the supply path and the return air path are constituted by ducts, for example. The blower means is composed of, for example, a fan or a blower. Further, the plurality of dehumidifiers arranged in the supply path are constituted by, for example, a dry dehumidifier in which an adsorption rotor is arranged in the middle of the supply path. In the dehumidifying system of the present invention , the treated air can be dehumidified in stages by a plurality of dehumidifying devices arranged in the supply path, and for example, air having an ultra-low dew point of -80 ° C or less can be produced. It is possible. Moreover, by returning the low dew point air in the low dew point chamber to the supply route through the return air route, the low dew point air in the low dew point chamber can be reused and the operating cost can be reduced. In this case, since the blowing means for blowing the low dew point air in the low dew point chamber into the return air path is provided, positive pressure is maintained in the return air path and the supply path by the blowing of the air blowing means, for example, in the machine room. There is no concern that air with a high dew point outside the system such as the atmosphere will enter the return air path or the supply path. Therefore, according to the dehumidifying system of the present invention , it is possible to prevent an increase in humidity due to invasion of outside air into the system, and it is possible to efficiently produce low dew point air at a lower operating cost.

Arranging the blower means in a low dew point room
As a result, the air sucked by the blowing means is only the air existing in the low dew point chamber. Further, a return air chamber may be formed adjacent to the low dew point chamber, and the blower means may be arranged in the return air chamber. As a result, the air sucked by the blower means is only low dew point air equivalent to the air existing in the low dew point chamber that has flowed into the return air chamber from the low dew point chamber. According to the dehumidifying system of the present invention , the downstream side of the blower unit is kept at a positive pressure, and it is possible to prevent outside air from entering.

[0011]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a dehumidifying system 1 according to an embodiment of the present invention. The dehumidifying system 1 is configured to supply the low dew point chamber 2 with air having an extremely low dew point of -80 ° C. or lower, for example.

In the low dew point chamber 2, a supply duct 3 for supplying low dew point air (an air path for taking in outside air, dehumidifying and supplying it to the low dew point chamber), and a low dew point in the low dew point chamber 2 are provided. A return air duct 4 for returning air to the middle of the supply duct 3 and an exhaust duct 5 for exhausting air from the inside of the low dew point chamber 2 are connected. In this embodiment, three dehumidifying devices 6, 7, 8 are arranged in the supply duct 3 in series in order from the outside air intake.

The dehumidifying devices 6, 7 and 8 are all dry dehumidifying devices having an adsorption rotor.
Since 7 and 8 have the same structure, the dehumidifying device 6 which is arranged on the most upstream side of the supply duct 3 and which dehumidifies the outside air OA first will be described as a representative. The dehumidifying device 6 includes a fan 10, a cooler 11 and a rotor 12. The rotor 12 is, for example, a honeycomb rotor impregnated with an absorbing liquid such as lithium chloride or calcium chloride, or an adsorption rotor made of an adsorbent such as silica gel or zeolite. A belt 13 is wound around the outer peripheral surface of the rotor 12, and by transmitting power to the belt 13 by a pulley 16 attached to a rotating shaft 15 of a motor 14,
The rotor 12 is configured to rotate. Rotor 1
The air passage area located on the end surface of 2 is divided into a dehumidification area 17 and a regeneration area 18, and the air supplied into the low dew point chamber 2 through the supply duct 3 passes through the rotor 12 in the dehumidification area 17. pass. Further, in the regeneration area 18, heated air is supplied to the rotor 12. After the air blown by the fan 10 is cooled by the cooler 11, the rotor 12 is rotated by the operation of the motor 14 to pass the air through the dehumidifying area 17 of the rotor 12 to produce dry air, while the regeneration is performed. By passing the heated air through the rotor 12 in the zone 18, the moisture in the adsorbent contained in the rotor 12 is evaporated into the heated air, and the dehumidification process is continuously performed. In the dry dehumidifying device, when the end surface of the rotor 12 that has become hot in the regeneration zone 18 immediately moves to the dehumidification zone 17 due to the rotation of the rotor 12, the air passing through the rotor 12 in the dehumidification zone 17 is discharged. May become hot and raise the dew point. Therefore, in this embodiment, the reproduction area 1
8 is provided between the dehumidifying zone 17 and the dehumidifying zone 17 so that the end surface of the rotor 12 rotates in the order of the regeneration zone 18, the purging zone 19 and the dehumidifying zone 17 for cooling. The end surface of the rotor 12 is cooled in advance by passing the purge air of the above. Although the dehumidifying device 6 arranged on the most upstream side of the supply duct 3 has been described as a representative, the other dehumidifying devices 7 and 8 have the same configuration as the dehumidifying device 6. Therefore, in FIG. 1, the dehumidifying device 7,
The same reference numerals as those of the constituent elements of the dehumidifying device 6 are given to the constituent elements of No. 8 to omit duplicated description.

And, these three dehumidifying devices 6, 7, 8
The air having a super-low dew point of, for example, −80 ° C. or lower, which is created by dehumidifying the air in a stepwise manner, is supplied into the low dew point chamber 2 through the supply duct 3.

A fan 20 arranged in the low dew point chamber 2 is attached to the inlet side of the return air duct 4. The outlet side of the return air duct 4 is connected to the supply duct 3 between the three dehumidifiers 6, 7 and 8, and in this embodiment, the most of the supply duct 3 is treated so as to dehumidify the outside air first. The outlet side of the return air duct 4 is connected to the supply duct 3 between the dehumidifying device 6 and the next dehumidifying device 7 arranged upstream. Then, by operating the fan 20 arranged in the low dew point chamber 2, the low dew point air in the low dew point chamber 2 is returned to the supply duct 3 between the dehumidifying device 6 and the dehumidifying device 7. .

Besides, a fan 21 is attached to the outlet side of the exhaust duct 5. By operating this fan 21, it is also possible to exhaust the inside of the low dew point chamber 2 through the exhaust duct 5.

In the dehumidification system 1 configured as described above, the supply duct 3 is inserted from the inlet side of the supply duct 3.
The outside air taken into the inside is subjected to a stepwise dehumidification treatment by the three dehumidification devices 6, 7, and 8, for example, −80 ° C.
The following ultra-low dew point can be supplied into the low dew point chamber 2 through the supply duct 3. Then, by operating the fan 20 provided in the low dew point chamber 2 to return the low dew point air in the low dew point chamber 2 to the supply duct 3 through the return air duct 4,
The low dew point air in the low dew point chamber 2 can be reused, and the operating cost can be reduced. In this case, since the fan 20 is installed in the low dew point chamber 2, the low dew point air in the low dew point chamber 2 flows into the return air duct 4. Then, the return air duct 4 and the supply duct 3 are maintained at a positive pressure by the air blown by the fan 20, and the air having a high dew point outside the system such as the atmosphere in the machine room enters the return air duct 4 and the supply duct 3 for example. Don't worry. The fan 20 may be suspended in the upper space of the low dew point chamber 2 or may be installed on the floor. In particular, if the outlet side of the return air duct 4 is connected to the supply duct 3 between the dehumidifier 6 and the next dehumidifier 7 arranged at the most upstream side of the supply duct 3 as in the illustrated embodiment. , Contributes to improving the efficiency of the dehumidifiers 6, 7, and 8. As in the illustrated embodiment, by connecting the outlet side of the return air duct 4 to the supply duct 3 between the dehumidifier 6 and the next dehumidifier 7 arranged at the most upstream side of the supply duct 3. It is considered that the inside of the supply duct 3 is kept at a positive pressure except for the upstream side of the dehumidifying device 6, so that the invasion of air having a high dew point from the outside of the system can be prevented in almost the entire supply duct 3. In this case, the inside of the supply duct 3 has a negative pressure on the upstream side of the dehumidifying device 6, but on the upstream side of the dehumidifying device 6, the outside air that has not been dehumidified is still in the upstream side of the dehumidifying device 6. Even if air outside the system enters the supply duct 3 on the side, there is almost no effect. As described above, according to the dehumidification system 1 of the embodiment of the present invention, it is possible to prevent an increase in humidity due to the entry of air having a high dew point from the outside of the system, and to efficiently manufacture low dew point air at a lower operating cost. It can be supplied into the low dew point chamber 2.

Although an example of the preferred embodiment of the present invention has been described above, the present invention is not limited to the embodiment described here. For example, in FIG. 1, the return air duct 4
Although the example in which the fan 20 for blowing the air is arranged in the low dew point chamber 2 has been described, there are cases where the fan 20 cannot be installed in the low dew point chamber 2. In such a case, for example, as shown in FIG. 2, the return air chamber 30 is formed adjacent to the low dew point chamber 2,
The fan 20 may be arranged in the return air chamber 30. In this case, the return air chamber 30, the low dew point chamber 2, and the partition wall that separates the return air chamber 30 and the low dew point chamber 2 are made of dust-proof and totally finished concrete, and ventilation from the low dew point chamber 2 to the return air chamber 30 is performed. Alternatively, the operation may be performed through a gallery provided on the partition wall. When a ceiling board is installed in the low dew point chamber 2 to form a double ceiling, for example, the inside of the ceiling chamber is formed as an airtight ceiling chamber and the low dew point air is formed as a ceiling chamber communicating with the low dew point chamber 2. The fan 20 can be installed above the ceiling by supplying air also to the above the ceiling to maintain the pressure balance between the low dew point chamber 2, the ceiling above and outside the room.

With the structure shown in FIG. 2, similarly, the ambient air around the fan 20 has a low dew point, so that the mixing of air having a higher dew point is prevented. Further, the inside of the return air duct 4 is kept at a positive pressure by the operation of the fan 20, and it is possible to prevent the entry of air having a high dew point from outside the system.

Further, as shown in FIG. 3, the fan 20 can be arranged outside the low dew point chamber 2. However, in that case, the fan 20 is surrounded by the chamber 31,
Of the return air duct 4 between the low dew point chamber 2 and the fan 20 or the return air duct between the fan 20 and the low dew point chamber 2 4, the air outside the low dew point chamber 2 does not enter. In this case, it is preferable that the chamber 31 is entirely welded to the iron plate except for the inspection port. Also, duct 4'and chamber 31
It is preferable to seal a connecting portion with and an outlet of an electric wire for supplying power to the fan 20 with a silicone seal. As a result, the performance of the entire dehumidification system 1 can be secured. In addition, by setting the positive pressure in the chamber 31 or properly calculating the static pressure by the fans 10 and 20,
A low dew point air is sent to the supply duct 3 up to the chamber 31 by the air supply fan 10, and thereafter the fan 20
Is fed to the supply duct 3 .

In addition, in the illustrated dehumidifying system 1, an example in which a dry dehumidifying device having an adsorption rotor is used as the dehumidifying devices 6, 7 and 8 has been described, but a cooling dehumidifying device, a wet dehumidifying device, an absorbing device Other types of dehumidifiers, such as dry type dehumidifiers, may be used. In addition, the supply duct 3 has three dehumidifying devices 6, 7, 8
Although the example of arranging is shown, two dehumidifiers may be arranged in the supply duct 3, or four or more dehumidifiers may be arranged. Also, the position where the outlet side of the return air duct 4 is connected is
The air in the low dew point chamber 2 is supplied to the supply duct 3 not only between the first dehumidifying device 6 and the next dehumidifying device 7 but also between the second dehumidifying device 7 and the third dehumidifying device 8. You can put it back,
Alternatively, the air in the low dew point chamber 2 may be supplied to the supply duct 3 both between the first dehumidifier 6 and the next dehumidifier 7 and between the second dehumidifier 7 and the third dehumidifier 8. You can bring it back.

[0023]

According to the present invention, the treated air can be dehumidified in stages to a low dew point by a plurality of dehumidifiers arranged in the supply path, and the low dew point inside the low dew point chamber can be supplied to the supply path through the return air path. By returning the dew point air, the low dew point air in the low dew point room can be reused to reduce the operating cost. In this case, a positive pressure is maintained in the return air passage and the supply passage by the blowing of the air blowing means, and there is no concern that air with a high dew point outside the system will enter the return air passage or the supply passage. According to the dehumidifying system of the present invention, it is possible to lower the dew point temperature in the low dew point chamber by about 10 ° C. or more, as compared with the dehumidifying system having the same specifications. Further, since the dehumidification system of the present invention prevents the invasion of outside air by setting a positive pressure in the return air passage and the supply passage, it is not necessary to use an extremely airtight duct or a completely enclosed blower. In addition, low dew point air can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of a configuration of a dehumidifying system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an embodiment in which a fan is arranged in the return air chamber adjacent to the low dew point chamber.

FIG. 3 is an explanatory diagram of an embodiment in which a fan is arranged outside a low dew point room.

[Explanation of symbols]

1 dehumidification system 2 Low dew point room 3 supply ducts 4 Return air duct 5 exhaust duct 6 dehumidifier 10 fans 11 cooler 12 rotor 13 belt 14 motor 15 rotation axis 16 pulley 17 dehumidification area 18 play area 20 fans 21 fans

Claims (2)

(57) [Claims] 1. A dehumidification system comprising a low dew point chamber maintained in a low dew point atmosphere, a supply path for supplying low dew point air to the low dew point chamber, and a plurality of dehumidifiers arranged in the supply path. Te, provided with a return air path for returning the low dew point air in a low dew point room supply path between the plurality of dehumidifying devices, low dew blowing means for blowing low dew point air in a low dew point room return air in the path
A dehumidification system characterized by being placed in a point room . 2.A low dew point chamber that maintains a low dew point atmosphere
The supply path for supplying low dew point air to the dew point chamber and the supply path
A dehumidification system with multiple dehumidifiers arranged
hand, Low dew point chamber on the supply path between the plurality of dehumidifiers
A low dew point chamber is provided along with a return air path for returning the low dew point air of
A ventilation means is installed to blow the low dew point air inside the return air path.
If a return air chamber is formed adjacent to the low dew point chamber,
In both cases, the blower means should be installed in this return air chamber.
A dehumidification system characterized by and.