JPH09313864A - Dehumidifying and drying method of air and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and inexpensively dehumidify and dry air by being brought the air into contact with an absorbent consisting of a Li compound provided with hygroscopicity in a relative flow, producing dehumidified and dried air, heating the treated absorbent by solar energy and evaporating absorbed moisture. SOLUTION: A contact part 16 is formed at the lower part of a first heat exchanger 14 via a partitioning wall 15 formed an opening in the center, and the absorbent A consisting of the Li compound provided with hygroscopicity is ejected from an ejection pipe 17 and is effectively brought into contact with the air flowing in the first heat exchanger 14 at the contact part 16. The dehumidified air at the contact part 16, is heated at the first heat exchanger 14 to become specific dehumidified and high temp. dry air and be ejected from a blowoff port 12. On the other hand, the absorbent A came into contact with the air at the contact part 16, drops, being collected to a collection part 19 at the lower part, and fed to a heat exchange room 21 via a pump line 20, and a preheated absorbent A is fed to an evaporation treating tank 26, irradiated with solar energy through a glass pipe 28, heated, evaporated the moisture and regenerated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air dehumidifying and drying method and apparatus for obtaining dehumidified and dried air.

[0002]

2. Description of the Related Art Conventionally, there are a heat pump method and a silica gel method for producing low humidity and high temperature air. The heat pump method is a method in which air is dehumidified by an evaporator and heated by a condenser and a heater. The silica gel method is a method in which moisture in the air is absorbed by silica gel and heated by a heater.

However, both of these methods have the problems that they mainly rely on electric power, the equipment cost is high, and that it takes time to regenerate the absorbent.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dehumidifying and drying method for air, which is efficient and effective, and which can reduce the cost.

[0005]

According to a first aspect of the present invention, air is brought into contact with an absorbent composed of a lithium compound having a hygroscopic property by relative flow to produce dehumidified dry air.
The method is a method for dehumidifying and drying air, in which the treated absorbent is heated by solar energy to evaporate absorbed moisture.

According to a second aspect of the present invention, a treatment chamber in which air is made to flow for dehumidification treatment and a lithium compound solution having hygroscopicity provided in the treatment chamber are brought into contact with the flowing air. Contact means for absorbing moisture in the air, evaporating means for evaporating moisture contained in the lithium compound solution after treatment by the contact means by solar energy, and circulation means for circulating the lithium compound solution between the contact means and the vaporizing means. And a dehumidifying / drying device for air.

According to a third aspect of the present invention, a heat exchanger that acts on the air in contact with the contact means is provided in the processing chamber, and the evaporation means is used as a heat medium of the heat exchanger. The apparatus for dehumidifying and drying air according to claim 2, which uses the lithium compound solution treated in (4).

According to a fourth aspect of the present invention, a heat exchanger that acts on the lithium compound solution in contact with air in the processing chamber is disposed in the circulation means that connects the processing chamber and the evaporation means, It is a dehumidifying and drying apparatus for air that uses the lithium compound solution treated by the evaporating means as a heat medium of the heat exchanger.

[0009]

According to the present invention, since the lithium compound which absorbs moisture from the air or the absorbent composed of the lithium compound solution is heated by the solar energy to be regenerated, it can be processed with energy saving and low cost. The absorbent can be regenerated simultaneously with the treatment of dehumidified dry air, which is efficient. Further, the lithium compound or the lithium compound solution is effectively heated by solar energy, the regeneration time is shortened, and dehumidified dry air can be efficiently obtained. Furthermore, by heating the dehumidified air using the heat absorbed during the regeneration of the lithium compound or the lithium compound solution, it is possible to efficiently and economically obtain low-humidity and high-temperature air. Further, the heat absorbed during the regeneration of the lithium compound or the lithium compound solution is used to preheat the lithium compound that has come into contact with the air in the processing chamber to absorb the water or the lithium compound solution before circulating the lithium compound solution to the evaporation means. This makes it possible to efficiently regenerate the absorbent.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawings show the air dehumidifying and drying apparatus of the present invention,
In FIG. 1, the absorbent A that absorbs water in this device is a lithium compound having hygroscopicity,
An example of this is an approximately 40% lithium chloride aqueous solution (lithium chromate specification), and it is also possible to use a 53 to 55% lithium bromide solution.

In this apparatus, the processing chamber 10 is a chamber formed for performing dehumidifying and heating treatment of air, and has an outside air intake port 11 on one lower side for flowing air.
The ceiling portion has a blowout port 12 for discharging the dried low-humidity and high-temperature air after treatment, and a fan 13 for flowing air is provided inside the outside air intake port 11 described above.

A first heat exchanger 14 is arranged inside the upper portion of the processing chamber 10 described above, and the above-mentioned absorbent A is used as a heat medium of this heat exchanger 14. This absorbent A will be described later. The temperature of the air flowing through the evaporation means is high and the air flowing at this high temperature is heated.

A contact portion 16 is formed in the lower portion of the above-mentioned first heat exchanger 14 through a partition wall 15 having an opening at the center, and this contact portion 16 has the above-mentioned first heat exchanger 14 therein. An injection pipe 17 is provided as a contact means for injecting the absorbent A flowing inside to effectively contact the air. From the injection pipe 17, the absorbent A is injected in a mist state or a shower state. It should be noted that a lattice-shaped straightening plate 18 is provided below the injection pipe 17.
Is arranged to rectify the flowing air and improve the contact efficiency with the absorbent A.

A collecting part 19 is formed at the bottom of the processing chamber 10 below the contact part 16 described above, and the collecting part 19 absorbs moisture by contacting air with the contact part 16 described above. Agent A is assembled.

The bottom collecting portion 19 of the processing chamber 10 is connected to the heat exchange chamber 21 via a pump line 20, and the pump line 20 is provided with a pump 22 for transporting the absorbent A. . A second heat exchanger 23 is housed in the heat exchange chamber 21 described above, and a line 24 connects the heat medium outflow side and the heat medium inflow side of the first heat exchanger 14 described above. An evaporation treatment tank 26, which is an evaporation means, is connected to the heat exchange chamber 21 via a pump line 25. A pump 27 for transporting the absorbent A is provided in the pump line 25. A plurality of glass tubes 28 extending downward are continuously provided at the bottom of the evaporation treatment tank 26.
8 ... Has a diameter of 40Φ, a length of 1200 mm, and a size capable of accommodating about 1 liter of the absorbent A. By irradiating the glass tube 28 with solar energy E, the absorbent A is heated. The water absorbed by the absorbent A can be evaporated.

Then, the absorbent A in the above-mentioned evaporation treatment tank 26
The outflow side is connected to the inflow side of the second heat exchanger 23 described above via a pump line 29. The pump line 29 is provided with a pump 30 for transporting the absorbent A.

In the air dehumidifying / drying device thus constructed, the solar energy E is applied to the glass tube 28 of the evaporation treatment tank 26.
Is irradiated, the absorbent A inside, that is, the lithium chloride aqueous solution is heated, and the water absorbed by this is evaporated.
It should be noted that if the heating temperature of the absorbent A, that is, the aqueous solution of lithium chloride reaches about 90 ° C., there is a sufficient effect of evaporating the water content, and by using the glass tubes 28 ... Can be reached

The absorbent A heated by evaporating water as described above is used as the second heat exchanger 23 and the first heat exchanger 14.
And is ejected in the form of mist or shower from the injection pipe 17 of the contact portion 16 of the processing chamber.

The outside air is taken into the processing chamber 10 through the outside air inlet 12 and is sent to the outlet 12 side by the fan 13, and is ejected in the form of mist or shower from the injection pipe 17 of the contact portion 16 described above. The water contained in the outside air is absorbed by the absorbent A by contacting the absorbent A, that is, the lithium chloride aqueous solution.

For example, the outside air temperature is 30 ° C. and the humidity is 70.
%, The air temperature of the absorbent A can be 30 ° C. and the humidity can be 35%.

Further, the air dehumidified by the contact portion 16 is heated by the first heat exchanger 14 to become a predetermined dehumidified high temperature dry air and is blown out from the blowout port 12. This dry air can have an air temperature of 40 ° C. and a humidity of 20%.

On the other hand, the mist-like or shower-like absorbent A which has come into contact with the air at the contact portion 16 is dropped and the lower collecting portion 19
The absorbent A collected in the above, and brought into contact with the outside air, has a solution temperature of about 32 ° C. and contains water.
Then, the collected absorbent A is sent to the heat exchange chamber 21 via the pump line 20.

In the above-mentioned heat exchange chamber 21, the second heat exchanger 2
The absorbent A after being treated in 3 is preheated to about 60 ° C., and the preheated absorbent A is heated to about 90 ° C. in the evaporation treatment tank 26 via the pump line 25 as described above to remove moisture. Evaporate and regenerate.

As shown above, according to this embodiment,
Since the absorbent A that has absorbed moisture from the air, that is, the lithium chloride aqueous solution is heated by the solar energy E to be regenerated,
Absorbent A that can be processed with energy saving and low cost
Is efficient because it can be regenerated simultaneously with the treatment of dehumidified dry air.

Further, when the absorbent A, that is, the lithium chloride aqueous solution is heated by the glass tube 28, the heat can be absorbed at an early stage, the regeneration time can be shortened, and dehumidified dry air can be efficiently obtained.

Furthermore, by heating the dehumidified air by utilizing the heat absorbed during the regeneration of the absorbent A, that is, the lithium chloride aqueous solution, low-humidity and high-temperature air can be obtained efficiently and economically.

Further, the absorbent A, that is, the heat absorbed during the regeneration of the lithium chloride aqueous solution is utilized to preheat the absorbent A which is in contact with the air in the processing chamber and circulates the absorbent A containing water into the evaporation processing tank 26. By doing so, it is possible to efficiently regenerate the absorbent A.

In the construction of the present invention, the absorbent is a lithium compound containing a hygroscopic lithium chloride aqueous solution and a lithium bromide solution.

Further, the contact means is the injection pipe 17 of the embodiment.
Corresponding to.

Further, the evaporation means corresponds to the evaporation treatment tank 26 of the embodiment.

Further, the circulation means is the pump line 20, the heat exchange chamber 21, the pump lines 25 and 29, and the second pump line of the embodiment.
Although it corresponds to the heat exchanger 23, the line 24, and the first heat exchanger 14, the present invention is not limited to the above-described embodiments.

[Brief description of drawings]

FIG. 1 is a block diagram of an air dehumidifying / drying device.

[Explanation of symbols]

 10 ... Processing chamber 14, 23 ... Heat exchanger 16 ... Contact part 17 ... Injection pipe 20, 25, 29 ... Pump line 21 ... Heat exchange chamber 24 ... Line 26 ... Evaporation treatment tank 28 ... Glass tube

Claims (4)

[Claims] 1. A dehumidified dry air is produced by bringing air into contact with an absorbent composed of a lithium compound having a hygroscopic property in a relative flow, and the absorbed absorbent is evaporated by heating the absorbent after treatment with solar energy. Dehumidifying and drying method of air. 2. A processing chamber for flowing air for performing dehumidification processing, and a contact means provided in the processing chamber for contacting a flowing hygroscopic lithium compound solution with the flowing air to absorb moisture in the air. Dehumidifying the air provided with an evaporation means for evaporating the water absorbed in the lithium compound solution after the treatment by the contact means by solar energy, and a circulation means for circulating the lithium compound solution between the contact means and the evaporation means. Drying device. 3. A heat exchanger that acts on air contacting the contact means is provided in the processing chamber, and a lithium compound solution treated by the evaporating means is used as a heat medium of the heat exchanger. The air dehumidifying / drying device according to claim 2. 4. A heat exchanger that acts on the lithium compound solution in contact with air in the processing chamber is provided in the circulation means that connects the processing chamber and the evaporation means, and the heat medium of the heat exchanger is the heat medium. 3. Use of a lithium compound solution treated by evaporation means.
The air dehumidifying and drying device described.