JP4715082B2 - Dehumidifying element, method for manufacturing the same, dehumidifying device and method for operating the device - Google Patents

Description

  The present invention relates to a dehumidifying element that can adsorb moisture in the air by an adsorption method and dehumidify the dehumidifying element, a manufacturing method thereof, a dehumidifying device using the dehumidifying device, and an apparatus operating method.

Conventional dehumidification elements are impregnated with a mixture of water adsorbent and inorganic binder in a corrugated paper made of inorganic fiber or organic fiber, impregnated with an inorganic binder, etc. It is used after being dried and solidified (for example, refer to Patent Document 1), or corrugated from paper made with inorganic fiber or organic fiber, impregnated with inorganic binder, etc. Silica gel was synthesized and used by impregnating and impregnating water glass or the like with an acid treatment (for example, see Patent Document 2).
JP-A-8-71352 Japanese Patent No. 2937437

  The conventional dehumidifying element manufacturing method has the advantage that heat resistance is obtained and the regeneration temperature can be increased because organic components are burned off, but it has a very large number of processes and impregnates moisture adsorbent with a binder. Adsorbent performance will be reduced because it must be attached, and water glass must be acid-treated to synthesize silica gel, so synthesis equipment is required and various air conditions and operating conditions of the dehumidifier When designing an optimal dehumidifying element, there was a problem that it was necessary to study from the synthesis conditions of the moisture adsorbent itself.

  The present invention solves such a conventional problem, and since a dehumidifying element is formed from a papermaking machine internally containing a moisture adsorbent, various commercially available moisture adsorbents can be used, or a commercial product can be post-treated. In addition, it is an object of the present invention to provide a dehumidifying element that can use a moisture adsorbent with different properties or a moisture adsorbent synthesized in-house and has various dehumidifying performances.

In order to achieve the above object, the present invention mixes 70% of silica gel, 20% of fibrillated organic pulp and 10% of ceramic fibers to increase the specific surface area of papermaking, and the basis weight is 150 g / m. ^The paper was made in No. ² , and the paper was slit in advance to a thickness necessary for the dehumidifying element, and the slit paper was corrugated and laminated or rolled while aligning the end faces to obtain a dehumidifying element.

According to the present invention, so as to increase the specific surface area of the paper, 70% silica gel, 20% fibrillated organic pulp, the basis weight paper making with 150 g / m ² by ceramic fibers were mixed with 10%, the By making a dehumidifying element characterized by comprising papermaking, the specific surface area of the papermaking is increased, the amount of dehumidification is improved, and it is effective as a dehumidifying device when the heat source to be regenerated is at a relatively low temperature. Paper made with an adsorbent can be used after being processed into various arbitrary shapes, and can be processed without using a binder. Furthermore, it is possible to select from a variety of commercially available adsorbents according to the air conditions of the usage environment and the operating conditions of the dehumidifying device, so that the dehumidifying device can be manufactured without considering the synthesis conditions of silica gel. can do.

Embodiments of the present invention is to increase the specific surface area of the paper, 70% silica gel, 20% fibrillated organic pulp, papermaking at 150 g / m ² basis weight by ceramic fibers were mixed with 10% This was corrugated to obtain a dehumidifying element.

  Examples of the moisture adsorbent include silica gel, activated clay, activated alumina, synthetic zeolite, natural zeolite, activated carbon, activated carbon fiber, molecular sieve carbon, mesoporous silica, polymer adsorbent, ion exchange resin and the like.

In order to increase the specific surface area of paper, 70% silica gel, 20% fibrillated organic pulp and 10% ceramic fiber were mixed to make a paper with a basis weight of 150g / m ^2. A slit is made in advance at the paper making stage to a proper thickness.

  The slit paper is corrugated through two gears to form a corrugated paper, and the flat paper that does not pass through the gear is bonded to the flat paper while aligning the end faces.

  In addition, the final dehumidifying element shape is obtained by winding the paper making of corrugated paper and flat paper making while aligning the end faces. Alternatively, the final dehumidifying element shape is obtained by laminating the paper sheets obtained by laminating corrugated paper and flat paper, while aligning the end faces of the paper.

  Further, a boss is provided at the center of the dehumidifying element and an outer peripheral frame is provided on the outer periphery, and the dehumidifying element is incorporated into the dehumidifying device. The dehumidifying device has a structure in which the dehumidifying element of this shape is rotated by the gear motor while holding the outer peripheral frame with the outer periphery pressing member, and the regeneration method is waste heat of the distributed power source, natural energy, electric heater / gas heater / hot water heater Any one of the above is used, and the regeneration temperature is 100 ° C. or less and the dehumidification / regeneration is repeated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

( Reference Example 1)
30% (No. 1), 50% (No. 2), 70% (No. 3), 90% (No. 4) with respect to organic pulp obtained by fibrillating RD type silica gel having an average particle size of about 5 μm. A paper was prepared by mixing and making a paper with a basis weight of 150 g / m ² . About 0.2g of prepared paper is 150 ° C
Then, pretreatment was performed while vacuum degassing for 5 hours, and a water adsorption isotherm at 27 ° C. was measured using a BELSORP18 (manufactured by Nippon Bell Co., Ltd.) adsorption device. FIG. 1 shows the results. The horizontal axis represents the relative humidity of air in contact with the adsorbent (here, relative pressure), and the vertical axis represents the amount of moisture adsorbed per gram of dry paper at each relative humidity. The amount of moisture adsorption tended to increase as the amount of silica gel added increased. However, if the amount of silica gel added exceeds 90%, the strength of the papermaking itself will decrease and the powder (silica gel) will fall off, and the papermaking will lose its flexibility. It was. Therefore, an internal addition amount of 70 to 80% is appropriate for manufacturing a dehumidifying element in which silica gel is internally added and corrugated. Usually, when evaluating the dehumidifying performance of a household dehumidifier, it is performed at 27 ° C. and 60% RH, so that this temperature and humidity is taken as the air state during adsorption. In addition, since regeneration is assumed to be at a relatively low temperature of about 70 ° C., when the temperature of 27 ° C. and 60% RH is raised to 70 ° C. with a regeneration heat source, the relative humidity becomes 7% RH, so the air during regeneration The state was 70 ° C. and 7% RH. That is, not only the moisture adsorption amount at 27 ° C. and 60% RH is increased, but also the difference in the adsorption and desorption amount in the air during adsorption and regeneration becomes important. Therefore, from the water adsorption isotherm measured as shown in FIG. The difference in adsorption amount between 60% RH and 70% 7% RH was calculated as the effective adsorption amount. From this index of effective adsorption amount, it was found that the amount of internal addition of silica gel needs to be 70% or more.

( Reference Example 2)
30% organic pulp fibrillated with 70% RD type silica gel having an average particle size of about 5 μm was mixed to give a basis weight of 50 g / m ² (No. 3-1) and 150 g / m ² (No. 3-2). 3) A paper sheet was corrugated to a pitch of 3.4 mm and a height of 1.9 mm as shown in FIG. 3, and a dehumidifying element having a thickness of 92 mm × 92 mm and a thickness of 50 mm was prepared. The dehumidifier dried at 70 ° C. 7% RH, installed in stationary adsorption measuring apparatus as shown in FIG. 4, the dehumidifier air is adjusted to 27 ° C. 60% RH in air volume 0.5 m ³ / min The amount of adsorption at the time of feeding was measured. The amount of adsorption was measured by measuring the increase in the weight of the entire adsorption amount measuring apparatus with an electronic balance and determining the amount of moisture adsorption over time. FIG. 5 shows the results of changes in moisture adsorption over time, the horizontal axis represents elapsed time, and the vertical axis represents moisture adsorption per gram of dry dehumidifying element. As a result, the dehumidifying element (No. 3-2) having a basis weight of 50 g / m ² has a shortage of moisture adsorption amount and the basis weight is 150 g / m ^{2 with} respect to a commercially available dehumidifying element manufactured by a conventional method. It was found that the dehumidifying element (No. 3-1) was almost equivalent. However, the dehumidifying element (No. 3-2) having a basis weight of 50 g / m ² has a low increase in adsorption amount per unit elapsed time and the adsorption rate is inferior to a commercially available dehumidifying element manufactured by a conventional method. I understood that.

(Example 1 )
Papermaking (No. 5) and polyester fiber with a basis weight of 150 g / m ² , 70% RD type silica gel with an average particle size of about 5 μm, 20% fibrillated organic pulp, and the remaining 10% ceramic fiber Papermaking (No. 6) was prepared. While measuring the water adsorption isotherm at 27 ° C. of the prepared paper, the N ₂ adsorption isotherm at −196 ° C. was also measured to calculate the BET specific surface area. FIG. 6 shows the result of the water adsorption isotherm, and FIG. 7 shows the specific surface area calculated from the N ₂ adsorption isotherm. As a result, the amount of moisture adsorbed at 27 ° C. and 60% RH is as high as 0.19 g / g when 10% ceramic fiber is mixed (No. 5), but when 10% polyester fiber is mixed (No. 5). .6) was found to be as low as 0.13 g / g. Moreover, the specific surface area of the papermaking mixed with the polyester fiber is as low as 320 m ² / g, which is consistent with the low effective adsorption amount. Furthermore, compared to the case of 20% fibrillated organic pulp and 10% ceramic fiber (No. 5) and the case of 30% fibrillated organic pulp (No. 3), the former has a higher specific surface area and fibrillated pulp. Suggests the possibility of covering the silica gel surface. However, if the fibrillated pulp is reduced and the ceramic fibers are increased by 10% or more, the papermaking itself loses its flexibility and corrugation cannot be performed. Therefore, the fibrillated organic pulp is preferably around 20%.

( Reference Example 3 )
As shown in FIG. 3, 20% of organic pulp fibrillated with 70% of RD type silica gel having an average particle size of about 5 μm and 10% of ceramic fiber are mixed and paper-made at a basis weight of 150 g / m ² . A corrugated material having a pitch of 3.4 mm and a height of 1.9 mm was laminated to prepare a dehumidifying element (No. 5-1) of 92 mm × 92 mm and a thickness of 50 mm. The dehumidifier dried at 70 ° C. 7% RH, installed in stationary adsorption measuring apparatus as shown in FIG. 4, the dehumidifier air is adjusted to 27 ° C. 60% RH in air volume 0.5 m ³ / min The amount of adsorption at the time of feeding was measured. The amount of adsorption was measured by measuring the increase in the weight of the entire adsorption amount measuring apparatus with an electronic balance and determining the amount of adsorption as a function of time. FIG. 8 shows the results of changes in moisture adsorption over time, the horizontal axis represents elapsed time, and the vertical axis represents moisture adsorption per 1 g of the dry dehumidifying element. As a result, it was found that the dehumidifying element (No. 5-1) of Reference Example 3 had almost the same amount of adsorption with respect to elapsed time as compared with a commercially available dehumidifying element manufactured by a conventional method.

(Example 2 )
Paper is made with a basis weight of 150 g / m ² by mixing 70% of RD type silica gel with an average particle size of about 5 μm, 20% of fibrillated organic pulp, and 10% of ceramic fibers. Dehumidification after slitting to 100 mm, corrugating with a pitch of 3.4 mm and a height of 1.8 mm, laminating the flat plate and the end face together to produce a single step and then winding the end face to a diameter of 300 mm An element was prepared. This was incorporated into a rotary dehumidifying element evaluation apparatus as shown in FIG. 10, and the amount of dehumidification was measured. A boss 10c is provided at the center of the dehumidifying element 10a, and an outer peripheral frame body 10b is provided on the outer periphery. The dehumidifying element is rotated by the gear motor 10e and the belt 10f while the outer peripheral frame body of the dehumidifying element is regulated by the outer peripheral pressing member 10d. The dehumidifying element is fixed by the shaft center 10g, and the air path is partitioned by the partition plate 10h, the upper tube 10i, and the lower tube 10j. The processing and regeneration winds are sent by the processing fan 10k and the regeneration fan 10l, and the regeneration heat source 10m is an electric heater, gas heater, hot water heater, etc., or waste heat of a distributed power source (micro gas turbine, fuel cell, diesel generator) or factory Waste heat and natural heat energy (solar and geothermal). The operating conditions of the dehumidifying device are as follows: the processing air volume is 2.9 m ³ / min, the regenerating air volume is 2.9 m ³ / min, the processing area: regeneration area = 1: 1, and the dehumidifying element rotation speed is 20 to 40 rph. The temperature was fixed at 60 ° C. and the dehumidification amount was measured. The dehumidifying amount was measured by measuring the absolute humidity at the inlet and outlet of the dehumidifying element with a dew point meter and calculating the dehumidifying amount per day (L / day) from the difference. FIG. 11 shows the dehumidifying performance when the dehumidifying element rotational speed is changed. The dehumidification amount of the commercially available dehumidifying element manufactured by the conventional method is 13.6 L / day at the maximum, whereas the dehumidifying element manufactured in Example 2 is 15.9 L / day at the maximum, which is an improvement of about 17%. It became.

  Since the conventional dehumidifying element is improved in strength by sintering, it can be cut to the required product size after corrugating. However, since there is no sintering process in the manufacturing process of the dehumidifying element of the present invention, the papermaking and dehumidifying element itself Is flexible. Therefore, since it cannot be cut after corrugating, it was slit in advance to the required product size at the paper making stage, and the corrugated corrugated paper and flat paper were bonded together while aligning the end faces. The laminated paper was laminated or rolled while aligning the end faces to produce a dehumidifying element of the required size. Further, in order to provide the rotary dehumidifying device with the flexible dehumidifying element of the present invention, a boss is provided at the center of the dehumidifying element, and an outer peripheral frame is provided on the outer periphery. So that the outer peripheral frame body is regulated by the outer peripheral pressing member so as not to slip.

According to Reference Example 1 described above, it was found that the adsorption performance was poor when the silica gel content was less than 70%, and conversely, when the silica gel content was 90% or more, the produced paper was not flexible and could not be corrugated. In addition, according to Reference Example 2, it was found that the target effective adsorption amount would not be obtained unless the basis weight of the papermaking containing 70% silica gel was 150 g / m ^{2. In} Example 1 , 70% silica gel was fibrillated. It turned out that the specific surface area of the papermaking which mixed 20% of organic pulp and 10% of ceramic fiber becomes the maximum. Further, in Reference Example 3 , it can be seen that the desorption element manufactured from the paper having the maximum specific surface area in Example 1 has a faster adsorption rate, and in Example 2 , it is improved by 17% over the conventional dehumidification element at a regeneration temperature of 60 ° C. It was found that dehumidifying performance can be obtained. From these results, there is a feature that is effective as a dehumidifier when the heat source to be regenerated is at a relatively low temperature.

Water adsorption isotherm when the amount of silica gel added in Reference Example 1 is changed Figure showing the effective adsorption amount of papermaking with the same amount of silica gel added internally Structure diagram of dehumidifying element formed by laminating corrugated papers of Reference Example 2 Schematic of the fixed dehumidification measuring device Graph showing the change in moisture adsorption amount of the dehumidifier and commercial dehumidifier fabricated from paper of varying the basis weight Water adsorption isotherm of papermaking with organic and inorganic fibers changed in Example 1 of the present invention Diagram showing specific surface area and effective adsorption amount of paper made with the same organic and inorganic fibers Change over time of moisture adsorption amount of dehumidifying element manufactured from paper made by changing organic and inorganic fibers in Reference Example 3 and commercial dehumidifying element Structure diagram of dehumidifying element formed by winding corrugated paper of Example 2 of the present invention Schematic of the same rotary dehumidification measuring device The figure showing the dehumidification performance of the dehumidification element of Example 2 of this invention and a commercial dehumidification element

Explanation of symbols

4a Dehumidifying element 4b Fan 10a Dehumidifying element 10b Outer frame 10c Boss 10d Outer holding member 10e Motor 10f Belt 10g Axis 10h Partition plate 10i Upper cylinder 10j Lower cylinder 10k Processing fan 10l Regenerative fan 10m Regenerative heat source

Claims (9)

To increase the specific surface area of paper, 70% silica gel, 20% fibrillated organic pulp and 10% ceramic fiber are mixed to make a paper with a basis weight of 150g / m2, Dehumidifying element. The method for producing a dehumidifying element according to claim 1, wherein the end faces of corrugated paper are aligned and laminated. 2. A method for producing a dehumidifying element according to claim 1, wherein the corrugated paper is rolled by aligning the end faces. A dehumidifying device comprising the dehumidifying element according to claim 1. A dehumidifying device comprising the dehumidifying element according to claim 1, wherein dehumidification and regeneration are repeated at a regeneration temperature of 60 ° C. A dehumidifying device that repeats dehumidification and regeneration by providing a boss at the center of the dehumidifying element according to claim 1, providing an outer peripheral frame on the outer periphery of the dehumidifying element, and rotating the dehumidifying element with a gear motor while pressing the outer peripheral frame with an outer pressing member. A boss is provided at the center of the dehumidifying element according to claim 1, an outer peripheral frame is provided on the outer periphery of the dehumidifying element, the dehumidifying element is rotated by a gear motor while holding the outer peripheral frame with an outer pressing member, and dehumidified at a regeneration temperature of 100 ° C. or lower.・ Operation method that repeats regeneration. The operating method according to claim 7, wherein the heat source for regeneration is selected from at least one of a micro gas turbine, a waste heat of a fuel cell and a diesel generator as a distributed power source, a factory waste heat, and sunlight and geothermal heat as natural heat energy. The operation method according to claim 7, wherein the heat source for regeneration is selected from at least one of an electric heater, a gas heater, and a hot water heater.

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