JP2001293325A - Adsorptive structure and method preparing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adsorptive structure including a desiccant capable of regenerating at a relatively low temperature and miniaturizing thereof, a method for preparing the same and a device for dehumidification and air conditioning provided with such adsorptive structure. SOLUTION: The adsorptive structure having a composition containing a porous aluminum phosphate type molecular sieve, an inorganic fiber and a colloidal silica extrusion molded in a honeycomb shape and fired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorptive structure, a method for producing the adsorptive structure, and a dehumidifying air conditioner provided with the adsorptive structure. The present invention relates to a method for manufacturing a structure and a dehumidifying air conditioner including an adsorptive structure.

[0002]

2. Description of the Related Art Conventionally, in order to perform dehumidifying air conditioning in an air-conditioned space, a desiccant rotor has been used which adsorbs and dehumidifies moisture from treated air and desorbs and regenerates moisture with regenerated air. Silica gel or zeolite is used as a moisture adsorbent to be mounted on such a desiccant rotor, that is, a desiccant (drying agent). They were bonded to each other and processed into a honeycomb shape, which was formed as a rotor.

[0003]

According to the above-mentioned conventional desiccant, it is necessary to regenerate air at a relatively high temperature of about 80 ° C. to adsorb and regenerate moisture from the processing air at about 27 ° C. did. Therefore, the use of low-temperature exhaust heat is limited, and the production of the desiccant rotor is complicated, and it is difficult to reduce the size.

[0004] Therefore, the present invention can be reproduced at a relatively low temperature,
It is an object of the present invention to provide a desiccant-containing adsorptive structure that can be miniaturized, a method for producing the desiccant, and a dehumidifying air-conditioning apparatus including such an adsorptive structure.

[0005]

In order to achieve the above object, an adsorptive structure according to the first aspect of the present invention comprises a porous aluminum phosphate molecular sieve, inorganic fibers and colloidal silica as shown in FIG. Is extruded into a honeycomb shape and fired.

[0006] With this structure, the porous aluminum phosphate-based molecular sieve is provided, so that it can be regenerated at a relatively low temperature. Since it contains inorganic fibers and colloidal silica, it has sufficient strength and is extruded into a honeycomb shape. Since it is fired, it has a simple structure, is easy to manufacture, and is suitable for miniaturization.

According to another aspect of the present invention, there is provided a method for producing an adsorptive structure comprising a porous aluminum phosphate-based molecular sieve, inorganic fibers and colloidal silica. Extruding the composition containing the porous aluminum phosphate-based molecular sieve, inorganic fiber and colloidal silica, and calcining the composition at any temperature in the range of 400 to 700 ° C. for at least 1 hour. .

According to a third aspect of the present invention, there is provided a dehumidifying air conditioner having a desiccant rotor 103 having the adsorptive structure according to the first aspect as a moisture adsorbent. A processing air path for flowing processing air for absorbing moisture with the moisture adsorbent to lower the absolute humidity; and a regeneration air path for flowing regeneration air for desorbing and regenerating the moisture of the moisture adsorbent.

With this configuration, since the desiccant that can be regenerated at a relatively low temperature is provided, the heat lift of the heat pump can be reduced, and energy can be saved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding members are denoted by the same or similar reference numerals, and duplicate description is omitted.

FIG. 1 shows an example of the shape of the adsorptive structure according to the present invention. As a support material of the powder of the porous aluminum phosphate-based molecular sieve used in the present invention, sepiolite fibers are preferably used as the inorganic fibers.
The fiber length of the inorganic fiber is selected from an appropriate length in a range of about 0.001 to about 2 mm, and the fiber diameter is selected from an appropriate diameter in a range of about 0.01 to about 20 μm. As the fiber having a fiber length of 0.1 mm or more, carbon fiber, alumina fiber, or the like is used.

Further, such a composition preferably contains colloidal silica as an inorganic binder to give the composition an appropriate formability and to form a porous aluminum phosphate-based molecular sieve through the binder. The powder and the inorganic fibers are appropriately dispersed and held in the molded body. The content ratios of these components are as follows: 30 to 87% by weight of porous aluminum phosphate-based molecular sieve, and 10 to 10% of inorganic fiber.
It is preferable that the content is 30% by weight and the inorganic binder is 3 to 10% by weight. Further, as other components, polyvinyl alcohol (PVA), sulfonic methylcellulose (SM
Organic binders such as C), methylcellulose (MC), carboxymethylcellulose (CMC) and starch may be used. This organic binder is decomposed and removed in the firing step.

As the inorganic fiber, besides sepiolite fiber, ceramic fiber such as carbon fiber, glass fiber, alumina fiber, alumina / silica fiber and silica fiber may be used. Further, in addition to colloidal silica, sols such as alumina sol, ethyl silicate, silica sol, zirconia sol, and water glass may be used.

The above composition is kneaded into a clay, the clay is extruded, and the molded product is fired to obtain a ceramic body. This ceramic body is the adsorptive structure for adsorbing moisture of the present invention. One embodiment of a method for producing the adsorptive structure is as follows.

A composition having the above-described components is prepared, and the composition is extruded into a shape as shown in FIGS. 1 and 2 by using an extruder having a required extrusion die. I do. The extrusion speed is preferably 10
About 100 cm / min. The extruded molded product may be dried like a sun-dried brick, but is preferably dried by, for example, hot air. That is, after the honeycomb forming, hot air is passed through all the through holes so as to make the flow rate uniform, and drying is performed. The dried molded article is calcined by maintaining the molded article in an atmosphere at a temperature in the range of 400 to 700 ° C. for at least one hour to produce the adsorptive structure of the present invention. This structure has a honeycomb structure and is a moisture-adsorbing structure that adsorbs moisture.

The manufacturing method including the extrusion step and the sintering step is a simple step and can produce an adsorptive structure at low cost.

The drying is carried out by natural drying at room temperature for about 24 hours, but it may be dried by heating to about 40 to 80 ° C. by a microwave heating device or the like.

Calcination does not impair the adsorption properties of the composition.
Temperature in the range of 0-700 ° C, preferably 500-60
Perform at least 1 hour at a temperature in the range of 0 ° C. The adsorptive honeycomb-shaped ceramic body, which is the adsorptive structure thus obtained, is obtained by dispersing the powder of the porous aluminum phosphate-based molecular sieve, which is the powder of the adsorbent, appropriately through an inorganic binder, and forming sepiolite fibers. It has a structure reinforced by carbon fibers and carbon fibers, increases the adsorption surface area of the adsorbent, and sufficiently exhibits its excellent moisture adsorption characteristics.

The honeycomb shape and size of the adsorptive structure according to the present invention can be appropriately selected according to the method of use as a desiccant and the like. Here, the honeycomb shape may be a structure having not only a honeycomb shape (having a hexagonal hole) but also a plurality of through holes 2 through which gas flows in one direction. , A polygon such as a triangle, a quadrangle, or a circle. For example, as shown in FIG. 1, the adsorptive structure has a thick disk shape or cylindrical shape, and a plurality of holes through which gas flows in the thickness direction (the cross-sectional shape of the hole in FIG. 1 is rectangular). ing. During manufacture, this structure is extruded in the thickness direction.

This structure is mounted as a desiccant rotor of a dehumidifying air conditioner through a shaft hole 3 at the center of the disk, and repeats dehumidification of the processing air and regeneration of the desiccant.

Referring to FIG. 2, another example of the adsorptive structure will be described. FIG. 2 is a perspective view showing an example of an adsorptive structure suitable as a desiccant rotor of a dehumidifying air conditioner. In the figure, the adsorptive structure 11 has six segments 11 a, 11 b, 11 c, 11 having a central angle of about 60 degrees and a sectoral cross section.
d, 11e, and 11f. Each segment is the adsorptive structure of the present invention. The six segments form a disk having one circular cross-section by assembling the main parts of the fan on the central shaft 13 to form one desiccant rotor. Each segment has a myriad of holes in the direction parallel to the axis 13 (holes with a circular cross section in the example of FIG. 2).
12 are provided therethrough. The partition wall 14 of the adsorbent of the present invention surrounding the hole forms the adsorptive structure 11a.

This structure is mounted as a desiccant rotor of a dehumidifying air conditioner by a shaft hole 13 at the center of the disk, similarly to the structure of FIG. Thus, the adsorptive structure of the present invention is not only integrally extruded as a desiccant rotor, but also as a segment obtained by dividing the rotor,
Alternatively, it may be manufactured by extrusion molding as an element constituting the rotor. For example, an adsorptive structure in which a large number of through holes are formed in a columnar body as shown in FIG. 1 may be made, and the columnar bodies may be bundled to constitute one desiccant rotor.

The holes 2, 12 provided in the adsorptive structures 1, 11
Can be appropriately selected in shape and size. In the example of FIG. 1, the center interval between the holes 2 is about 2 mm, and the thickness of the partition wall 4 forming the hole is about 0.5 mm. However, the present invention is not limited to this. In addition, in order to make it easy to understand, in FIG. 1, the hole 2 is shown larger than the actual diameter relative to the outer diameter of the structure 1.

[0024]

Embodiments of the present invention will be described below. Of the present invention
Porous aluminum phosphate-based molecular sieves
For example, a specific X including at least the d-spacing shown in Table 1
AlPO with X-ray powder diffraction pattern _Four-5 or table
X-ray powder containing at least the d-spacing shown in 2
AlPO with diffraction pattern_Four-8 or as shown in Table 3
X-ray powder diffraction diagram including at least the d-spacing
AlPO with shape_Four-11 or as shown in Table 4
X-ray powder diffraction pattern containing at least d-spacing
Known as AlPO_Four-16, or d as shown in Table 5
Having a unique X-ray powder diffraction pattern including at least the spacing
AlPO_Four−20 or d− as shown in Table 6.
Having a unique X-ray powder diffraction pattern including at least
Name AlPO_Four-H6 or d-interval shown in Table 7
Commonly known as A having at least a unique X-ray powder diffraction pattern
lPO_Four-D. Here, the unit is θ, and d is on
Gustrom and I / I0 indicate the diffraction intensity.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

[Table 4]

[0029]

[Table 5]

[0030]

[Table 6]

[0031]

[Table 7]

Specific examples of the component ratio, molding firing conditions and characteristics are shown below.

[0033]

[Table 8]

The adsorptive structure thus produced is
Large adsorption surface area. In addition, unlike the case of using ceramic paper, etc., the content of a substance having a low adsorptivity is low,
The desiccant content per unit volume of the structure is as high as 60 to 80% in the structure of the present invention, while the conventional structure is 40% or less. In addition, for example, with silica gel, cracks occur and collapse with use,
Such a deterioration does not occur in the structure of the present invention.

The adsorptive structure produced in this way,
As a comparative example, the performance of a structure using a conventional silica gel as a desiccant, in particular, the adsorption duration is compared.

[0036] Figure 3, AlPO ₄ -5 and 64 parts by weight of a porous aluminum phosphate-based molecular sieve, 21 parts by weight of sepiolite fibers, molded and extruded colloidal silica composition containing 15 parts by weight of a honeycomb shape 50
FIG. 4 shows the performance when the adsorptive structure fired at 0 ° C. is used and FIG. 4 shows the performance when the silica gel structure is used. In both cases, the thickness in the thickness direction (the flow direction of the processing air) was 20 cm, and the measurement conditions were a regeneration air temperature of 60 ° C., an absolute humidity of the regeneration air of 15 g / kg DA, and a processing air temperature of 27.
° C, absolute humidity 11g / kgDA, air velocity of processing air 1.5
m / s. The vertical axis indicates the absolute humidity (g (moisture) /
kg (dry air)), the horizontal axis is the elapsed time (minutes), "entrance"
The curve shown as indicates the absolute humidity of the processing air inlet, and the curve shown as “outlet” indicates the absolute humidity of the processing air outlet.

As shown in FIG. 4, when silica gel is used for 5 minutes, the difference in humidity between the inlet and the outlet becomes considerably small. On the other hand, as shown in FIG. 3, according to the embodiment of the present invention, a sufficient humidity difference can be obtained even after 45 minutes have elapsed. Thus, according to the invention, a sufficiently long duration is obtained.

Next, an embodiment of a dehumidifying air conditioner using the adsorptive structure of the present invention will be described with reference to the flowchart of FIG. In the air conditioning system of this embodiment, a compression heat pump H using a compressor 260 is used as a heat pump.
P is used. This air conditioning system includes a desiccant rotor 103 including the adsorptive structure of the present invention.
A path of the processing air A for adsorbing the water by the heat source, and a path of the regeneration air B for desorbing and regenerating the moisture in the desiccant after passing through the desiccant rotor 103 after being heated by the heating source and adsorbing the moisture. An air conditioner having a sensible heat exchanger 104 between the treated air to which moisture has been adsorbed and the regenerated air before regenerating the desiccant (desiccant) of the desiccant rotor 103 and before being heated by the heating source. , A compression heat pump HP, the compression heat pump HP
The regeneration air of the air conditioner is heated by the heater 220 using the high heat source as a heating source to regenerate the desiccant, and the cooler 2 is used with the low heat source of the compression heat pump HP as the cooling heat source.
At 10, the processing air of the air conditioner is cooled.
The processing air is blown by the blower 102, and the regeneration air is blown by the blower 140.

In this air conditioning system, since the compression heat pump HP is configured to simultaneously cool the processing air of the desiccant air conditioner and heat the regeneration air, the compression heat pump HP is driven by driving energy externally applied to the compression heat pump HP. Generates a cooling effect of the processing air, and furthermore, the desiccant can be regenerated by the sum of the heat pumped from the processing air by the heat pump action and the driving energy of the compression heat pump HP. High energy saving effect can be obtained. In addition, the regeneration air between the sensible heat exchanger 104 and the heater 220 and the desiccant rotor 10
The heat exchanger 121 with the regenerated air exiting from No. 3 is provided to further enhance the energy saving effect. Before the processing air is supplied to the air-conditioned space 101, the dry-bulb temperature is lowered through the humidifier 105.

Since the adsorptive structure of the present invention is used in the desiccant rotor of this apparatus, the regeneration temperature can be made relatively low, for example, 60 to 65 ° C., and the temperature lift of the heat pump can be reduced. . In the example of FIG. 5, the heat pump is a compression heat pump, but is not limited to this, and may be an absorption heat pump.

[0041]

As described above, according to the present invention, since the adsorptive structure is formed by extruding a porous aluminum phosphate-based molecular sieve into a honeycomb shape and firing it, it can be regenerated at a relatively low temperature, and the adsorbable structure can be formed at a relatively low temperature. Since it is extruded and fired, it has a simple structure, is easy to manufacture, and is suitable for miniaturization. Further, since the adsorptive structure can be regenerated at a relatively low temperature, it is possible to provide a dehumidifying air conditioner having a high COP.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an adsorptive structure of the present invention.

FIG. 2 is a perspective view showing another embodiment of the adsorptive structure of the present invention.

FIG. 3 is a diagram showing the performance of an adsorptive structure according to an example of the present invention.

FIG. 4 is a diagram showing the performance of a conventional adsorptive structure as a comparative example.

FIG. 5 is a flowchart showing an example of a dehumidifying air conditioner using a desiccant rotor having an adsorptive structure according to an embodiment of the present invention.

[Explanation of symbols]

 1,11 adsorptive structure 2,12 holes 3,13 central axis 4,14 partition

Continuation of the front page (72) Inventor Kensaku Maeda 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Prefecture Ebara Research Institute, Ltd. (72) Inventor Shoji Yamanaka 1-3-35- Minamikaniya, Minami-ku, Hiroshima-shi, Hiroshima 1105 (72) Inventor Daiki Miyamoto 1-2-17 Nishichiyogaoka, Nara City, Nara Prefecture (72) Inventor Taizo Kato 2--22-13 Hongodai, Sakae-ku, Yokohama-shi, Kanagawa Prefecture F-term in Environmental Ceramics Research Co., Ltd. 4D052 AA08 CB01 DA03 DB01 DB04 FA06 GB18 HA01 HA09 HA21 HA24 HB02 4G066 AA22D AA50B AA63D CA43 DA03 FA22 FA34 GA01 GA06

Claims (3)

[Claims] 1. An adsorptive structure obtained by extruding a composition containing a porous aluminum phosphate-based molecular sieve, inorganic fibers and colloidal silica into a honeycomb shape and firing the composition. 2. A composition containing a porous aluminum phosphate-based molecular sieve, inorganic fibers and colloidal silica is extruded into a honeycomb shape, comprising the extruded porous aluminum phosphate-based molecular sieve, inorganic fibers and colloidal silica. 400-
Calcination at any temperature in the range of 700 ° C. for at least 1 hour; a method for producing an adsorptive structure. 3. A desiccant rotor having the adsorptive structure according to claim 1 as a moisture adsorbent; a treatment air path through which a treatment air for adsorbing moisture with the moisture adsorbent to lower the absolute humidity is provided; A regeneration air path for flowing regeneration air for desorbing and regenerating moisture of the adsorbent; a dehumidifying air conditioner.