JP2010196993A - Desiccant air conditioner and method of operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desiccant air conditioner capable of exerting superior adsorbing/desorbing performance in a low-temperature area, further minimizing the device, and saving energy, and to provide a method of operating the air conditioner. <P>SOLUTION: This desiccant air conditioner is composed of a desiccant rotor 1 constituted by holding zeolite as an adsorbing material on a column-shaped honeycomb structure, an air blowing passage 2 at one side to allow to-be-dehumidified air to pass through a part of the desiccant rotor 1, and another air blowing passage 3 to allow air for regenerating the adsorbing material to pass through the other part of the desiccant rotor 1. Zeolite is AIPO-5 of crystalline aluminophosphates, and the desiccant rotor 1 is constituted to be rotatable by 5-15 times/hour. In an operation of the desiccant air conditioner, the desiccant rotor 1 is rotated by 5-15 time/hour. Further, the other part of the desiccant rotor 1 is heated by the air for regenerating the adsorbing material, adjusted to 40-60&deg;C. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a desiccant air conditioner and a method for operating the desiccant air conditioner, and more specifically, a desiccant air conditioner for humidity adjustment using a desiccant rotor that generates dehumidified air and humidified air by an adsorption / desorption function of an adsorbent, and The present invention relates to an operation method of a desiccant air conditioner.

  The desiccant air conditioner is a device that adjusts humidity by using the adsorption / desorption function of the adsorbent. Various cooling devices that can reduce energy consumption by using low-temperature exhaust heat such as a cogeneration system, air conditioning As a device and humidity control device, contribution to environmental problems is expected. For example, when a desiccant air conditioner is applied to a living space, a comfortable living environment can be constructed by adjusting the room temperature to a slight temperature difference from the outside air by dehumidifying in the summer and humidifying in the winter.

  The desiccant air conditioner is composed of a desiccant rotor in which an adsorbent is supported on a cylindrical honeycomb structure having ventilation cells open at both end faces, and one air passage that allows air to be dehumidified to pass through, for example, a semicircular portion of the desiccant rotor. And the other air passage that allows the adsorbent regeneration air to pass through, for example, another semicircular portion of the desiccant rotor, and the air flowing from one air passage to the adsorbent while rotating the desiccant rotor. Dehumidified air is generated by adsorbing water vapor, and the adsorbent is regenerated by desorbing water vapor from the adsorbent with the heated air flowing through the other air passage. In the above desiccant air conditioner, a temperature adjusting device such as a heat exchanger arranged in the other air passage is used, and low-temperature exhaust heat can be used as desorption heat for regeneration of the adsorbent.

  The capacity of the desiccant air conditioner depends on the adsorption / desorption performance of the desiccant rotor, and various studies have been made on the mechanical structure and adsorbent of the desiccant rotor. As a desiccant rotor, a honeycomb sheet made of a fibrous sheet is three-dimensionally assembled to form, for example, a short-axis columnar honeycomb structure in which ventilation cells open at both end faces, and the honeycomb structure is used as an adsorbent. “Adsorption rotors” and “rotor members” supporting silica gel and zeolite have been proposed (see Patent Documents 1 and 2). In addition, an “adsorption element” using zeolite as an adsorbent capable of adsorbing and desorbing water vapor in a relatively narrow temperature range and having a large amount of adsorption has been proposed. As zeolite, crystalline aluminophosphates (AlPO type) are proposed. (Zeolite) SAPO-34, FAPO-5, and the like are used (see Patent Documents 3 to 9).

  By the way, AlPO-based zeolite includes CHA (structure code) with oxygen 8-membered ring and three-dimensional pores, AFI (structure code) with oxygen 12-membered ring, and adsorption / desorption at low temperatures. From the viewpoint of performance, attention has been focused on AlPO-5 constituting the structure of AFI (see Patent Document 7).

JP 2003-38928 A JP 2003-222354 A JP 2007-144417 A JP 2007-190546 A JP 11-137947 A Japanese Patent Laid-Open No. 11-165064 JP-A-11-197439 JP 2000-61251 A JP 2001-293325 A

  In order to further improve the utility of the desiccant air conditioner, it is necessary to improve the adsorption performance and to reduce the size and energy of the device. However, as long as conventional silica gel and zeolite are used, the load on the rotor will increase greatly. Because it is not possible, significant improvement cannot be expected. Therefore, from the viewpoint of improving performance, it is conceivable to use AlPO-5 as an adsorbent having a large adsorption / desorption amount in a low temperature region. However, in fact, when AlPO-5 is applied to a desiccant rotor, there is a situation that it is surprising that sufficient dehumidifying performance cannot be exhibited even when compared with a conventional apparatus using silica gel or the like.

  The present invention is mainly intended for the use of AlPO-5 in a desiccant rotor, and its purpose is to exhibit excellent adsorption / desorption performance in a low temperature region, and to further reduce the size and energy of the apparatus. The purpose is to provide a desiccant air-conditioning apparatus and its operating method.

  The inventors of the present invention have studied various applications of AlPO-5 to the desiccant rotor. In the conventional desiccant air conditioner, the desiccant rotor is used as a standard control condition in which the adsorption / desorption efficiency of silica gel or zeolite with respect to water vapor is maximized. However, in the desiccant rotor using AlPO-5, when the rotational speed is set within the above range, the actual speed of the adsorbent is higher than that of the adsorbent. It was confirmed that the amount of adsorption was greatly reduced.

  As a result of further studies, the present inventors have found that the above-described phenomenon of AlPO-5 is caused by the difference in adsorption / desorption rate. That is, AlPO-5 has a slower adsorption / desorption speed and a longer adsorption / desorption time even under the same temperature difference and humidity difference conditions as compared with conventional silica gel and zeolite. When the range is set, the adsorption / desorption amount decreases, whereas when the rotation speed is set low, the adsorption / desorption amount tends to increase gradually. It was confirmed that the adsorption / desorption amount became the largest at a low speed rotation called time.

  The present invention has been made by utilizing the characteristic properties of AlPO-5 as described above. The first gist of the present invention is a desiccant air conditioner equipped with a desiccant rotor, in which ventilation cells are provided at both end surfaces. A desiccant rotor in which zeolite as an adsorbent is supported on a cylindrical honeycomb structure that is open to the air, one air passage that allows air to be dehumidified to pass through a portion of the desiccant rotor, and air for adsorbent regeneration And the other air passage through which the desiccant rotor is passed, and the zeolite of the desiccant rotor is AlPO-5, a crystalline aluminophosphate having Al and P in the skeleton structure, and the desiccant A rotor exists in the desiccant air conditioner characterized by being comprised so that rotation is possible at 5-15 times / hour.

  The second gist of the present invention resides in an operating method of the desiccant air conditioner described above, wherein the desiccant rotor is rotated at 5 to 15 times / hour.

  According to the present invention, since a specific zeolite is used as the adsorbent and the desiccant rotor is rotated at a low speed, the adsorption / desorption performance of the adsorbent can be sufficiently exhibited, and the apparatus configuration including the drive mechanism can be further downsized. Further energy savings can be achieved.

It is a longitudinal section showing an example of composition of a desiccant air conditioner concerning the present invention. It is the perspective view and partial enlarged view which show an example of the external appearance of a desiccant rotor used for the apparatus of FIG. 1, and a honeycomb structure. FIG. 2 is a perspective view and a partially enlarged view showing an external appearance of a desiccant rotor used in the apparatus of FIG. 1 and another example of a honeycomb structure. It is a water vapor | steam adsorption isotherm which shows the adsorption | suction characteristic of AlPO-5 as an adsorbent applied to this invention.

  An embodiment of a desiccant air conditioner and an operation method thereof according to the present invention will be described with reference to the drawings.

  First, the desiccant air conditioner of the present invention provided with a desiccant rotor will be described. As is well known, the desiccant air conditioner (desiccant air conditioning system) uses the adsorption / desorption action of the adsorbent to remove moisture from indoor air to be humidity-adjusted or air supplied to the room and discharge it outdoors. It is a device that absorbs moisture from the outdoor air or air that is discharged to the outside and supplies it to the indoor air or the room where the humidity should be adjusted. In addition, it is configured as a humidity control air conditioner such as a large desiccant air conditioner installed as a building facility, a dehumidifying air conditioner including a small dehumidifier installed indoors, or a humidified air conditioner.

  As shown in FIG. 1, the desiccant air conditioner of the present invention includes a desiccant rotor 1 to be described later, one air passage 2 through which air to be dehumidified passes through one part of the desiccant rotor 1, and air for adsorbent regeneration. It is mainly composed of the other air passage 3 that passes through the other part of the desiccant rotor 1 (the part not including the one part).

  The above desiccant air conditioner is configured by forming the air passages 2 and 3 inside the box-shaped casing 1 and accommodating necessary members. One air passage 2 has, for example, a large number of ventilation cells 10 (see FIGS. 2 and 3) leading from one upper end of the desiccant rotor 1 formed in a cylindrical shape to the upper half of the other end. The flow path is configured so as to send air to be dehumidified (treated air). In order to supply the air to the desiccant rotor 1, for example, a fan 21 as an air blowing unit is disposed on the one air passage 2 on the downstream side in the air blowing direction with respect to the desiccant rotor 1.

  Further, the other air passage 3 is for adsorbent regeneration with respect to a large number of ventilation cells 10 (see FIGS. 2 and 3) leading from one lower end of the desiccant rotor 1 to, for example, the lower half of the other end. The flow path is configured to feed the air (heated air). Further, for example, on the upstream side of the air blowing direction of the other air passage 3 with respect to the desiccant rotor 1, the temperature-adjusting adsorbent regeneration air is supplied to the desiccant rotor 1. 31 is arranged.

  Further, as the fan 21 and the fan 31, a fan having an air volume such that the air passage time in the desiccant rotor 1 is 0.03 to 0.4 seconds is used. The air volume of the fans 21 and 31 is determined by taking the above-mentioned passage time into consideration, the size of the air passages 2 and 3, the opening area of the honeycomb structure described later of the desiccant rotor 1 (total opening area of the ventilation cell 10), the desiccant rotor. 1 (the length of the ventilation cell 10).

  The reason why the air passage time with respect to the desiccant rotor 1 is defined in the above range is as follows. That is, when the air passage time is less than 0.03 seconds, the contact time of air with the adsorbent is short, and water vapor cannot be sufficiently adsorbed and desorbed on the adsorbent, so that the performance of the desiccant rotor 1 is sufficient. The device becomes larger. On the other hand, when the air passage time exceeds 0.4 seconds, the air throughput decreases, and similarly, the performance of the desiccant rotor 1 cannot be sufficiently exhibited.

  Although the drawings illustrate the air passages 2 and 3 having the simplest structure, the air to be dehumidified and the air for regenerating the adsorbent are separated from one part and the other part of the desiccant rotor 1. As long as it is provided so that it can be passed separately, the form and arrangement of the air passages 2 and 3 are not particularly limited.

  As will be described later, the desiccant rotor 1 is formed in a short-axis cylindrical shape, and a rotation shaft (not shown) inserted through the center of the desiccant rotor 1 is rotatable along a boundary portion between the air passage 2 and the air passage 3. Is arranged. And it is made to rotate at a fixed speed by a drive mechanism. That is, the desiccant rotor 1 rotates across the air passage 2 and the air passage 3 with its end face (the opening surface of the ventilation cell) orthogonal to the air flow direction of the air passages 2 and 3. ing. The area ratio (zone ratio) between the adsorption region (portion through which the air in the air passage 2 passes) and the desorption region (portion through which the air from the air passage 3 passes) in the desiccant rotor 1A depends on the application (difference between devices). Is set.

  As a driving mechanism of the desiccant rotor 1, various mechanisms such as a mechanism for driving the above-described rotating shaft by a motor via a gear can be used. For example, the drive mechanism illustrated in FIG. 1 includes a motor 4 provided outside the casing 6 and a belt wound around the outer periphery of the desiccant rotor 1 from a pulley of the motor, and the desiccant rotor 1 The driving force of the motor 4 is directly transmitted to the circumference of the motor. The desiccant rotor 1 is configured to rotate at a constant speed by, for example, inverter control of the motor 4.

  In the present invention, a specific zeolite, which will be described later, is used as the adsorbent in the desiccant rotor 1 in order to improve the performance by fully exhibiting the adsorption / desorption characteristics of the adsorbent and to reduce the size and energy of the apparatus. In addition, the desiccant rotor 1 is rotated at a lower speed. That is, in the present invention, the desiccant rotor 1 is configured to be rotatable at 5 to 15 revolutions / hour (hereinafter referred to as “rph”), preferably 8 to 12 rph. In addition, the temperature difference at the time of adsorption / desorption of the adsorbent can be increased, and the adsorption amount can be increased.

  For example, the temperature adjusting device 5 heats the air flowing through the other air passage 3 and heats other parts (for example, the lower half) of the desiccant rotor 1 located in the other air passage 3 with radiant heat. Provided. The type of the temperature adjustment device 5 depends on the size and use of the desiccant air conditioner, but in the case of a small device used as a dehumidifier in a living room, the temperature adjustment device 5 is usually an electric heater such as an electric heater. Heating means are used. Further, in the case of a large-sized device used as an air conditioner such as a building or a warehouse, for example, from a heat medium pipe that circulates hot water as a heat medium and a thin plate-like fin attached to the heat medium pipe. The so-called plate fin type heat exchanger is constituted. In that case, the exhaust water can be effectively used by circulating the hot water produced using various low-temperature exhaust heats through the temperature adjusting device 5. In addition, when air in a lower temperature adsorbent regeneration temperature range is obtained, such air may be directly introduced into the other air passage 3.

  In the present invention, at the time of the detachment operation, for example, the above-described temperature adjusting device 5 is used so that the other part of the desiccant rotor 1 can be adjusted to a predetermined temperature. Since the temperature control of the desiccant rotor 1 (adsorbent) itself for adsorbent regeneration (desorption) itself is complicated and impractical, practically, the adsorbent regeneration air flowing through the other air passage 3 is kept at a predetermined temperature. Configured to adjust. Such temperature (regeneration temperature) is usually 40 to 60 ° C. The upper limit temperature is preferably 55 ° C, more preferably 50 ° C, and even more preferably 45 ° C. That is, the relative humidity of the air for adsorbent regeneration can be adjusted to 1 to 50% Rh, for example, by heating with the temperature adjusting device 5. In the present invention, AlPO-5, which will be described later, is used as the adsorbent, and the desiccant rotor 1 is rotated at a low speed as described above. Therefore, the adsorbent can be regenerated in the low temperature range as described above.

  The desiccant air conditioner generates dehumidified air by adsorbing water vapor to the adsorbent of the desiccant rotor 1 from the air passing through one air passage 2 while rotating the desiccant rotor 1, and the temperature is raised to a predetermined temperature. Then, the adsorbent is regenerated by desorbing water vapor from the adsorbent of the sicant rotor 1 by the air passing through the other air passage 3.

  Next, the desiccant rotor 1 used for the above desiccant air conditioner will be described. The desiccant rotor 1 is a rotating member used for adsorbing and desorbing water vapor in a desiccant air conditioner. As shown in FIGS. 2 and 3, a cylindrical honeycomb structure in which ventilation cells 10 are opened at both end surfaces. It is configured by supporting zeolite as an adsorbent on the body. The desiccant rotor 1A shown in FIG. 2 and the desiccant rotor 1B shown in FIG. 3 are formed in, for example, a short-axis columnar shape, and the above-described rotation shaft is mounted at the center.

  The desiccant rotor 1A and the desiccant rotor 1B are different in the structure of the honeycomb structure. The honeycomb structure of the desiccant rotor 1A shown in FIG. 2 has a base material sheet 11 formed in a flat plate shape and a base material sheet 12 formed in a corrugated plate shape alternately arranged in a laminated state along the diameter direction. The cell 10 for ventilation | gas_flowing of substantially triangular opening shape is comprised. On the other hand, the honeycomb structure of the desiccant rotor 1B shown in FIG. 3 is formed by arranging the base sheet 13 formed in a corrugated shape in a laminated state along the circumferential direction, and has a substantially hexagonal opening shape for ventilation. A cell 10 is provided.

  In each of the desiccant rotors 1A and 1B, the honeycomb structure is assembled by cutting and processing a flat sheet. The base sheets 11, 12, and 13 can be made of various materials as long as they have sufficient rigidity to hold the skeleton structure of the honeycomb structure and can support the adsorbent. Examples of the constituent material of the base sheets 11, 12, and 13 include fibrous sheets and resin sheets such as polycarbonate, polypropylene, polyacetal, and polyamide. Of these, fibrous sheets are preferable. In the present invention, the fibrous sheet refers to a sheet made of an aggregate of inorganic or organic fibrous substances, and the fibrous substances may be intertwined with each other. For example, fillers having a large aspect ratio, nonwoven fabrics, and the like are also included in the concept of “fibrous”.

  Specifically, the material of the fibrous sheet is composed of ceramic fibers mainly composed of silica / alumina, glass fibers, carbon fibers produced from raw materials containing carbon such as PAN and tar, and fibrous clay substances. Examples thereof include mineral fibers, organosilicon fibers produced from organosilicon polymers, and metal fibers produced from metals such as Fe, Cu, Al, Cr, and Ni. Examples of the chemical fiber include fibers such as acrylic, polyethylene, polypropylene, polyurethane, polyclar, nylon, rayon, vinylon, vinylidene, polyvinyl chloride, acetate, and polyester. Natural fibers such as cellulose, silk, and cotton can also be used.

  The honeycomb structure of the desiccant rotor 1A shown in FIG. 2 is manufactured by joining the convex portions of the corrugated base sheet 12 to the flat base sheet 11 and laminating them in the radial direction of the desiccant rotor. Is done. That is, a corrugated base sheet 12 is joined to a flat base sheet 11 to produce one continuous honeycomb sheet having a width corresponding to the thickness of the honeycomb structure (length in the axial direction), It is manufactured by winding this around a core material (rotating shaft) in a spiral shape, or by sequentially winding it around the core material (rotating shaft) every round. The ventilation cell 10 of the honeycomb structure shown in FIG. 2 has an opening formed in a substantially triangular shape, and the arrangement direction X of the ventilation cells 10 is a direction along the longitudinal direction of the base sheets 11 and 12. That is, the direction is along the circumference of the honeycomb structure. The above honeycomb sheet can be manufactured by a honeycomb forming machine.

  The honeycomb structure of the desiccant rotor 1B shown in FIG. 3 is manufactured by joining the convex portions of the substantially corrugated substrate sheet 13 with a predetermined width. That is, a large number of base sheets formed in a rectangular flat plate shape (for example, a belt shape) are laminated, and the front and back of each base sheet are shifted at a constant pitch parallel to one side of the base sheet and 1/2 pitch on the front and back. After joining the adjacent base material sheets to each other in a large number of linear joints set in the state, one side perpendicular to the linear joint is a long side and the other side parallel to the linear joint is short. When the laminated body as a side is cut out and then expanded, the other two parallel laminated surfaces adjacent to the laminated surface on which the ventilation cell 10 opens (the laminated surface corresponding to the short side) are curved. Manufactured by unfolding the laminate in a state.

  In other words, when the laminated body is developed, the laminated body is bent in an annular shape so that one short side of the belt-shaped base sheet 13 is located on the inner circumference and the other short side is located on the outer circumference. And base material sheet 13 equivalent to the both end surfaces of the lamination direction of a laminated body is joined. When the honeycomb structure shown in FIG. 3 is manufactured, the laminated body is formed by directly laminating the strip-shaped base sheet 13 formed in advance with a predetermined size, and when laminating these, the linear joining portion described above is used. It may be produced by bonding in the above. The ventilation cell 10 of the honeycomb structure shown in FIG. 3 has an opening formed in a substantially hexagonal shape, and the arrangement direction X of the ventilation cells 10 is a direction along the longitudinal direction of the substrate sheet 13. That is, the direction is along the radius of the honeycomb structure. Note that the honeycomb structure shown in FIGS. 2 and 3 can be manufactured by the method disclosed in Japanese Unexamined Patent Application Publication No. 2007-190546.

  In the desiccant rotor 1 as described above, the size of one ventilation cell 10 of the honeycomb structure is the opening width (the diagonal length of the hexagon or the base of the triangle. The length) is designed to be about 2 to 15 mm, and the number of stacked layers of the ventilation cells 10 (the number of ventilation cells arranged in the radial direction) is designed to be about 100 to 1000. In general, the desiccant rotor 1 is designed to have an outer diameter of about 10 to 450 cm and a thickness (length in the air flow direction) of about 2 to 50 cm.

  In the desiccant rotor 1, the zeolite as the adsorbent is applied to the honeycomb structure as described above by applying an aqueous dispersion in which the adsorbent and the binder are dispersed in water, and the honeycomb structure is heated and dried. The base material sheets 11, 12, 13 of the structure can be supported on the surface and inside of the base material sheets 11, 12, and 13 in an entangled state with the fibers.

  The aqueous dispersion is prepared by adding zeolite particles and a binder to water to which a particle settling inhibitor has been added. In consideration of ease of handling and production efficiency when applied to the honeycomb structure, the solid component concentration is usually adjusted to 30 to 50%, preferably around 40%. The aqueous dispersion can be applied by a spray method, but is usually applied by a dip coating method in which the honeycomb structure is immersed in the aqueous dispersion from the viewpoint of increasing production efficiency. Moreover, in the heat drying process of the honeycomb structure after applying the aqueous dispersion, warm air drying is usually performed at a temperature of 120 to 200 ° C. for 20 to 120 minutes. In addition, you may perform application | coating and heat drying of an aqueous dispersion liquid in multiple times.

  By the way, when dehumidifying air is dehumidified by a desiccant air conditioner and the adsorbent is regenerated in a low temperature region, for example, summer air having a temperature of 35 ° C. and a relative humidity of about 90% is dehumidified, while exhaust heat, etc. The air is heated to 40 ° C. as described above and used for regeneration of the adsorbent. In this case, the relative humidity of the desorption air is about 70%. Furthermore, when trying to regenerate at a lower temperature range, the humidity of the desorption air becomes higher, for example, reaches 72%.

  On the other hand, when humidifying low-humidity air with a desiccant air conditioner, for example, in order to humidify indoors using winter air (outside air) at a temperature of 12 ° C. and a relative humidity of 28%, moisture from the outside air is used. Adsorption is required, in which case the relative humidity of the air is about 28%. When the same air is heated to 40 ° C. using low-temperature waste heat or the like and used for regeneration of the adsorbent, the relative humidity of the desorption air is about 5%. Furthermore, when the regeneration is attempted at a lower temperature range, the humidity of the desorption air becomes higher, for example, reaches 7%.

  As mentioned above, when dehumidifying and humidifying both high-humidity and low-humidity air, the adsorption amount difference at each relative humidity during adsorption and desorption must be sufficiently large as a characteristic of zeolite. . That is, the above zeolite has an adsorption isotherm of 25% relative humidity of 5% and an adsorption amount difference of 0.05 g / g or more and a relative humidity of 70% and a relative humidity of 90% on an adsorption isotherm at 25 ° C. Adsorption amount difference is 0.05 g / g or more, preferably adsorption amount difference between relative humidity 28% and relative humidity 7% is 0.05 g / g or more and relative humidity 72% and relative humidity 90% It is desirable that the amount difference is 0.05 g / g or more.

  In the present invention, a specific zeolite is used as an adsorbent satisfying the above characteristics. That is, in the present invention, AlPO-5, which is an aluminophosphate in aluminophosphates containing at least aluminum and phosphorus in the skeleton structure (hereinafter abbreviated as “AlPOs” as appropriate), is used as the zeolite. The

  AlPOs are crystalline aluminophosphates defined by IZA (International Zeolite Association), AEI, AEL, AET, AFI, AFN, AFR, AFS, AFT, AFX, ATO, Although it is ATS, CHA, ERI, LEV, VFI, the structure of AlPO-5 used in the present invention corresponds to the structure of AFI.

  The production conditions of the above AlPOs are not particularly limited. For example, the AlPOs can be produced using a known synthesis method described in Japanese Patent Publication Nos. 1-57041, 2003-183020, and 2004-136269. I can do it. Specifically, AlPO-5 is produced as follows. In addition, in the following manufacturing method, the example of a synthesis | combination of a small sample is given and the mixing ratio of material is shown.

  First, 10.3 g of pseudo boehmite (containing 25% water, manufactured by Sasol) is added to a mixture of 38 g of water and 17.5 g of 85% phosphoric acid and stirred. The mixture is stirred for 3 hours, 37 g of water is added thereto, and 6.8 g of triethylamine is further mixed and stirred for 3 hours to obtain a starting reaction mixture. This is charged into a 200 cc stainless steel autoclave containing a Teflon (registered trademark) inner cylinder and allowed to react at 190 ° C. for 12 hours in a stationary state. After the reaction, it is cooled, the supernatant is removed by decantation, and the precipitate is recovered. The precipitate is then washed three times with water and dried in an oven at 100 ° C. Thereafter, it is pulverized to an average of 5 microns in a dry process. 3 g of the template-containing sample thus obtained was placed in a vertical quartz tube, heated to 550 ° C. at a rate of 1 ° C./min in a nitrogen stream containing 5 vol% oxygen at 200 ml / min, and 550 By firing at 6 ° C. for 6 hours, AFI-type AlPO-5 can be obtained. The structure of the synthesized AlPO-5 can be confirmed by measuring XRD (using Cu—Kα ray).

  As one of the characteristics of the above AlPO-5, water vapor adsorption isotherms at 25 ° C., 35 ° C., 45 ° C. and 55 ° C. are shown in FIG. From the adsorption isotherm, for example, when the difference in adsorption amount per weight due to the difference in relative humidity of AlPO-5 at 25 ° C. is determined, the difference in adsorption amount at relative humidity 0.7 and 0.9 is 0.070 g / g, The difference in adsorption amount at a relative humidity of 0.72 and 0.9 is 0.060 g / g, the difference in adsorption amount at a relative humidity of 0.05 and 0.28 is 0.072 g / g, and the relative humidity is 0.07 and 0.28. The difference in adsorption amount is 0.069 g / g. The above-mentioned adsorption isotherm uses, for example, “Bellethorpe 18” (trade name), which is a volumetric apparatus manufactured by Nippon Bell Co., Ltd., and a vacuum condition of 5 Pa or less and a temperature of 120 ° C. After the pretreatment for the time, the temperature is measured for each predetermined adsorption temperature in an air thermostatic chamber under the conditions of an initial introduction pressure of 3 torr, a saturated vapor pressure of 23.755 torr, and an equilibration time of 500 seconds.

  Next, an operation method of the above desiccant air conditioner according to the present invention will be described. For example, when dehumidification is performed by a desiccant air conditioner, the fan 21 and the fan 31 are operated while the desiccant rotor 1 is rotated at a constant speed, so that one air passage 2 is unidirectionally (for example, as shown in FIG. 1). Air is blown from the left side of the desiccant rotor 1 to the right side, and at the same time, air is blown in one direction (for example, from the right side to the left side of the desiccant rotor 1 as shown in FIG. 1). And in one ventilation path 2, the air which should be dehumidified is made to pass through the desiccant rotor 1, and water vapor | steam is made to adsorb | suck to produce | generate dehumidified air. On the other hand, in the other air passage 3, the air is adjusted to a predetermined temperature by the temperature adjusting device 5, and the air whose temperature is raised and the relative humidity is lowered is passed through the desiccant rotor 1 to desorb water vapor from the adsorbent. .

  Specifically, for example, when used as an air conditioner for a room, air to be dehumidified is supplied from one air passage 2 into the room, and at that time, in the air by the adsorbent of the desiccant rotor 1 in the air passage 2 Adsorbs water vapor. At the same time, the air to be exhausted is discharged from the other air passage 3 to the outside, and at that time, the temperature adjusting device 5 in the air passage 3 is 40 to 60 ° C., preferably 55 ° C. or less, more preferably 50 ° C. or less. More preferably, the adsorbent is regenerated by desorbing water vapor from the adsorbent of the desiccant rotor 1 with air heated to 45 ° C. or less. In other words, the relative humidity of the air for regenerating the adsorbent is adjusted to 1 to 50% Rh by adjusting the temperature by the temperature adjusting device 5, and the adsorbent is regenerated. Thereby, dehumidified air can be sent into the room from one air passage 2 to dehumidify the room.

  When water vapor is adsorbed and desorbed by the desiccant rotor 1 as described above, in the present invention, the above-described AlPO-5 is used as the adsorbent for the desiccant rotor 1, and the desiccant rotor 1 is preferably 5 to 15 rph, preferably Rotate at 8-12 rph. As a result, the performance of the above AlPO-5 can be sufficiently exerted to dehumidify the room. In addition, by reversing the air delivery destination, exhausting the indoor air through one air passage 2 and simultaneously supplying outside air into the room through the other air passage 3, Humidified air can be sent to the room to humidify the room.

  That is, according to the present invention, AlPO-5, which is a crystalline aluminophosphate, is used as the adsorbent, and the desiccant rotor 1 is rotated at a low speed as described above, so that the desiccant rotor 1 is not enlarged. In addition, the adsorption / desorption performance of the adsorbent can be sufficiently exhibited in a low temperature region. Since the desiccant rotor 1 is rotated at a low speed, the apparatus configuration including the drive mechanism such as the motor 4 can be further reduced in size, and further energy saving can be achieved. In other words, since the desiccant rotor 1 can be rotated with a smaller driving force, a smaller motor can be used as the motor 4, and since mechanical wear due to the rotating shaft of the desiccant rotor 1 is less, a device configuration such as a bearing is provided. It can be downsized.

  Furthermore, in the present invention, the above-mentioned AlPO-5 is used as the adsorbent, and the desiccant rotor 1 is rotated at the low speed as described above, so that the adsorbent is at a low temperature range of 40-60 ° C. as described above. Can be played. Therefore, according to the present invention, it is possible to easily utilize lower-temperature exhaust heat.

  Incidentally, the operational effects of the present invention are considered as follows. That is, in the conventional desiccant rotor using silica gel or the like, the rotation speed is set to 20 to 30 rph in consideration of the adsorption efficiency, and the amount of heat released when switching to the adsorption operation is small due to the high rotation speed. Since the temperature difference between the adsorbents during adsorption and desorption is small, the adsorption / desorption amount per rotation is relatively small. On the other hand, in the present invention, since the adsorption rate of AlPO-5 is moderately slow, rotating the desiccant rotor 1 at a low speed of 5 to 15 rph allows the adsorbent heated during the desorption to be performed at the first stage of the adsorption operation. It can be cooled sufficiently. In other words, the temperature difference of the adsorbent itself during adsorption and desorption can be widened, and the adsorption / desorption amount per rotation can be increased. Moreover, since the desiccant rotor 1 is rotated at a low speed, the adsorbent can be regenerated (desorption operation) at a lower temperature. As a result, in the present invention, the desiccant rotor 1 can be downsized and required adsorption performance can be exhibited despite the low-speed rotation.

Example 1:
A honeycomb structure having the structure shown in FIG. 2 was manufactured, and AlPO-5, which is an AlPO-based zeolite, was applied to the honeycomb structure to produce a desiccant rotor 1A. Then, the desiccant rotor 1A is mounted on the desiccant air conditioner, and the dehumidifying operation is performed while changing the rotational speed and desorption temperature (regeneration temperature of the adsorbent) of the desiccant rotor 1A, and the temperature and humidity at the inlet and outlet of the air passage 2 are measured. The difference in the dehumidification amount due to the difference in the rotation speed and the desorption temperature was confirmed.

  The above-mentioned honeycomb structure was manufactured from base material sheets 11 and 12 made of ceramic fiber sheets and designed to have a diameter of 320 mm and a thickness (length along the rotation axis direction) of 200 mm. The ventilation cell 10 was designed to have a height of 2.1 mm and an arrangement pitch of 3.4 mm. The amount of AlPO-5 supported on the honeycomb structure was 80 g / L. The zone ratio of the desiccant rotor 1A was 1: 1.

  In the adsorption operation, the adsorption temperature (air temperature of the air passage 2) was 20.7 ° C., the absolute humidity in the air passage 2 was 13.9 g / kg · DA, and the wind speed was 2 m / s. In the desorption operation, the regeneration temperature (air temperature after heating the air passage 3) is 50 ° C., 55 ° C., 45 ° C., the absolute humidity in the air passage 3 is 19.3 g / kg · DA, and the wind speed is 2 m / s. Met. The measurement results are as shown in the following tables. In addition, the dehumidification amount (G) of each table | surface is calculated by following Formula.

Comparative Example 1:
Silica gel was applied to the honeycomb structure to produce a desiccant rotor. The amount of silica gel supported on the honeycomb structure was 80 g / L, and other configurations were the same as in Example 1. And the temperature and humidity in the inlet_port | entrance and exit of the ventilation path 2 were measured on the conditions similar to Example 1, and the difference in the dehumidification amount by the difference in rotation speed and desorption temperature was confirmed. The measurement results are as shown in the following tables.

Comparative Example 2:
A desiccant rotor was manufactured by applying FAPO-5, which is an AlPO-based zeolite, to the honeycomb structure. The amount of FAPO-5 supported on the honeycomb structure was 80 g / L, and other configurations were the same as those in Example 1. And the temperature and humidity in the inlet_port | entrance and exit of the ventilation path 2 were measured on the conditions similar to Example 1, and the difference in the dehumidification amount by the difference in rotation speed and desorption temperature was confirmed. The measurement results are as shown in the following tables.

Comparative Example 3:
A desiccant rotor was manufactured by applying SAPO-34, which is an AlPO-based zeolite, to the honeycomb structure. The amount of SAPO-34 supported on the honeycomb structure was 80 g / L, and other configurations were the same as in Example 1. And the temperature and humidity in the inlet_port | entrance and exit of the ventilation path 2 were measured on the conditions of Example 1, and the difference in the dehumidification amount by the difference in rotation speed and desorption temperature was confirmed. The measurement results are as shown in the following tables.

1 (1A): Desiccant rotor 1 (1B): Desiccant rotor 10: Cell for ventilation 11: Substrate sheet 12: Substrate sheet 13: Substrate sheet 2: Air blowing path 3: Air blowing path 4: Motor (drive mechanism)
5: Temperature adjusting device 21: Fan 31: Fan

Claims (6)

  A desiccant air conditioner equipped with a desiccant rotor, wherein a desiccant rotor is formed by supporting zeolite as an adsorbent on a cylindrical honeycomb structure in which ventilation cells are opened at both end surfaces, and the desiccant rotor One of the air passages that passes through one part and the other air passage that passes the air for regeneration of the adsorbent to the other part of the desiccant rotor, and the zeolite of the desiccant rotor has Al in the skeleton structure. A desiccant air conditioner characterized in that it is AlPO-5, a crystalline aluminophosphate having P, and the desiccant rotor is configured to be rotatable at 5 to 15 times / hour.   The desiccant air conditioner according to claim 1, wherein the air for adsorbent regeneration can be adjusted to 40 to 60 ° C.   The desiccant air conditioner according to claim 2, wherein the adsorbent regeneration air can be adjusted to a relative humidity of 1 to 50% Rh.   The operation method of the desiccant air conditioner according to any one of claims 1 to 3, wherein the desiccant rotor is rotated at 5 to 15 times / hour.   The operating method according to claim 4, wherein the other part of the desiccant rotor is heated by the air for regeneration of the adsorbent adjusted to 40 to 60 ° C. 6.   The operation method according to claim 5, wherein the relative humidity of air for adsorbent regeneration is adjusted to 1 to 50% Rh.

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