JP2012050928A - Heat exchanger for desiccant rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for desiccant rotors which heats air for regenerating an adsorbent, which is suitable, in particular, for a large-scale desiccant device, or cools treated air, the heat exchanger being simple in configuration, reducing the load to be imposed on a fan and having excellent thermal efficiency.SOLUTION: A heating device 1A as a heat exchanger for desiccant rotors heats air to be blown from a fan to the steam desorption area of a desiccant rotor 5. The heating device includes: a case 1 whose notch part 15 along a thickness direction is arranged along the axis 51 of the desiccant rotor 5; and a pipe heater 4 which is arranged in the case to protrude from the side of the case 1. The pipe heater 4 is arranged in an area in the case 1 except a spatial part which corresponds to a part directly above or directly below the notch part 15. A baffling plate 6, which prevents an air from flowing from an air inlet 2 to an air outlet 3, is arranged in the spatial part in the case 1 which corresponds to the part directly above or directly below the notch part.

Description

  The present invention relates to a heat exchange device for a desiccant rotor for heating or cooling adsorbent regeneration air blown to a desiccant rotor in a desiccant device.

  The desiccant device is a device that adjusts humidity using the water vapor adsorption / desorption function of the adsorbent, and is used as various dehumidifiers and air conditioners. The desiccant device comprises a desiccant rotor carrying an adsorbent, two air passages for generating dehumidified air and humidified air, while rotating the desiccant rotor at a constant speed across the two air passages, In this air passage, water vapor is adsorbed to generate dehumidified air, and in the other air passage, water vapor is desorbed to regenerate the adsorbent and generate humid air.

  In the desiccant device as described above, in order to regenerate the adsorbent of the desiccant rotor, as a device for supplying heated high-temperature air to the desiccant rotor, for example, it is disposed in the vicinity of one end surface of the desiccant rotor, and the fan A heating device for heating the air blown to the water vapor desorption region is used. In such a heating device, a nichrome wire heater is housed in a flat box-shaped case having an air inlet (opening) on the side and an air outlet (opening hole) on the back, and is introduced from the air inlet. When air for heating is heated by a heater and blown from the air outlet to the desiccant rotor, the flow of air is changed in the orthogonal direction in the case by a baffle plate arranged in the case (see Patent Document 1).

JP 11-333240 A

  By the way, the heating device having the above structure is suitable for a household dehumidifier for the purpose of downsizing due to its flat box structure, but for stores, offices, warehouses, factories, etc. In the large-sized desiccant device used for the above, the fan itself that blows air to the desiccant rotor is also increased in size. Therefore, in the heating device for a large desiccant device, the flow path is configured so that air is blown linearly from the fan to the desiccant rotor from the viewpoint of energy saving and noise reduction as much as possible by reducing the resistance in the middle of the flow path. The There is also a need for a heater with low air resistance and excellent thermal efficiency.

  However, since the heating device as described above is disposed close to the axis of the desiccant rotor, the heater does not work well in the case, and depending on the form of the heater, the air introduced into the case contacts the heater. The so-called short path phenomenon that passes through to the rotor side without increasing increases.

  On the other hand, when generating dehumidified air by adsorbing water vapor to the adsorbent, a cooling device with a box structure that cools air blown from the fan to the water vapor adsorption region of the desiccant rotor as a device for supplying low-temperature air to the desiccant rotor However, in such a cooling device, as in the case of the above-described heating device, depending on the arrangement of the coolers in the case, the air introduced into the case may be disposed near the other end surface of the desiccant rotor. Increases the short path phenomenon that passes through the rotor without contacting the cooler.

  The present invention has been made in view of the above circumstances, and the purpose thereof is heat exchange for heating adsorbent regeneration air blown to a desiccant rotor in a desiccant device or cooling air to be treated. An object of the present invention is to provide a heat exchange device for a desiccant rotor, which is a simple structure, has a small load on a fan and is excellent in thermal efficiency, and is particularly suitable for a large desiccant device.

  In order to solve the above problems, in the present invention, in the case of a box structure designed from the engagement with the shaft of the desiccant rotor, the air inlet and the air outlet are separated from each other as much as possible with respect to the front and back surfaces. And adopting a pipe-shaped heat exchanger with low air resistance and excellent thermal efficiency, and storing the heat exchanger in the case so as to protrude from the side of the case opposite to the axis of the desiccant rotor, And by arranging a baffle plate in the space part in the case near the axis of the desiccant rotor, that is, the space part on the tip side of the heat exchanger, heat exchange is performed in the air flow from the air inlet to the air outlet. The short path phenomenon that bypasses the vessel was reduced.

  That is, the gist of the present invention is a heat exchange device that is disposed between a desiccant rotor and a fan in a desiccant device and that heats or cools the air blown to the desiccant rotor, wherein the front and back shapes have square corners. A case that is formed in a box structure with a notch shape and is arranged close to one end face of the desiccant rotor along the thickness of the notch part along the axis of the desiccant rotor, and from the notch part A pipe-shaped heat exchanger arranged in a state protruding from the side surface of the case on the remote side, and the heat exchanger is directly above or directly below the notch in the case. The case front portion near the side surface of the case on the side away from the notch portion is arranged in a region excluding the space corresponding to the diameter of the fan. A circular air inlet of a size that is open is opened, and the case back portion near the side surface of the case near the notch portion has a size corresponding to the water vapor desorption region or the water vapor adsorption region of the desiccant rotor, and A fan-shaped air outlet centered on the notch is opened, and a flow of air from the air inlet to the air outlet is provided in a space corresponding to a position directly above or immediately below the notch in the case. It exists in the heat exchange apparatus for desiccant rotors characterized by the baffle plate for suppressing being arrange | positioned.

  According to the heat exchange device for a desiccant rotor of the present invention, the air inlet and the air outlet are opened in the front part and the back part of the case, respectively, and the pipe-like heat exchanger is accommodated in the case. Therefore, when the air is blown by the fan through the heat exchanger toward the desiccant rotor, the short path phenomenon that bypasses the heat exchanger in the flow of air from the air inlet to the air outlet. Can be reduced by the baffle plate, the heat or cold of the heat exchanger can be sufficiently transmitted to the air, and as a result, the power consumption of the heat exchanger can be reduced.

It is a perspective view which shows the whole structure of the heat exchange apparatus for desiccant rotors which concerns on this invention. It is a figure which shows the flow of the inside air in the heat exchanger apparatus for desiccant rotors which concerns on this invention, a divided figure (a) is a horizontal sectional view, and a divided figure (b) is the longitudinal cross-sectional view seen from the side surface side.

  As an embodiment of a heat exchange device for a desiccant rotor according to the present invention, an example of a heating device for a desiccant rotor (hereinafter referred to as “heating device”) will be described with reference to the drawings. As shown by reference numeral 1A in FIG. 1, the heating device of the present invention heats the adsorbent regeneration air blown to the water vapor desorption region of the desiccant rotor 5 (hereinafter abbreviated as “rotor”) in the desiccant device. And is disposed between the rotor 5 and a fan (not shown).

  As is well known, the rotor 5 is configured by, for example, supporting an adsorbent on a short-axis columnar honeycomb structure formed by forming a fibrous sheet or a resin sheet into a honeycomb. Alternatively, the rotor 5 is manufactured by extruding a material containing an adsorbent or an adsorbent precursor, and further firing it when the precursor is used. Usually, the outer diameter of the rotor 5 is about 30 to 200 cm, and the thickness is about 1 to 40 cm.

  The rotor 5 is configured to be rotatable at a constant speed by a drive mechanism (not shown) around a shaft 51 inserted through the honeycomb structure. In the rotor 5, the water vapor desorption region (adsorbent regeneration region) is usually set to a portion corresponding to about ¼ to ½ of the area of the rotor end face. As the adsorbent, silica gel or zeolite is used, but aluminophosphates containing at least aluminum and phosphorus in the skeleton structure in that water vapor can be adsorbed and desorbed in a relatively narrow temperature range and the adsorbed amount is large ( AlPOs) are preferred.

  1A of heating apparatuses of this invention are comprised from the case 1 comprised by the box structure, the pipe heater 4 arrange | positioned in the said case, and the baffle plate 6 mentioned later. The case 1 constitutes a flow path of air from the fan to the rotor 5 and constitutes a heating space, and has a front and back shape of a box structure in which a square corner is cut out. The case 1 illustrated in FIG. 1 has a front shape formed in a shape of a horizontally long rectangle with a lower left corner cut out. The case 1 is arranged close to one end surface of the rotor with the notch 15 along the thickness direction along the shaft 51 of the rotor 5. In other words, the case 1 has a structure that avoids a so-called shaft 51 in which a portion corresponding to the shaft 51 of the rotor 5 is retracted.

  In the case 1 described above, a circular air inlet 2 and a fan-shaped air outlet 3 are opened. The air inlet 2 is opened in the front portion near the side surface of the case 1 on the side away from the notch portion 15 and is formed in a circular shape having a size corresponding to the diameter of the fan. In addition, the air outlet 3 is opened in a back surface portion near the side surface of the case 1 on the side close to the notch portion 15 and has a size corresponding to the water vapor desorption region of the rotor 5 and is centered on the notch portion 15. It is formed in the sector shape. That is, the air outlet 3 is provided corresponding to the water vapor desorption region on the end surface of the rotor 5.

  As the pipe heater 4, a pipe heater with fins having low air resistance and excellent thermal efficiency is used. The pipe heater 4 is a so-called sheath heater configured by inserting a helical heating wire into a metal tube and filling and sealing the metal tube with high-insulating powder at a high density. The metal tube is generally made of stainless steel and has an outer diameter of about 8 to 15 mm. Nichrome wire and iron-chrome wire are used as the heating wire. As the powder filled in the metal tube, magnesium oxide having high thermal conductivity and good electrical insulation is usually used. The pipe heater 4 is finned on the outer periphery of the pipe in order to enhance the heat dissipation effect.

  In the heating device 1A of the present invention, in order to heat the space in the case 1 in a wider range, the pipe heater 4 having a structure bent into a U shape or a W shape (also referred to as an M shape) as illustrated is provided. For example, three are used. The electric power of each pipe heater 4 is set to about 300 to 1000 W, and these are arranged in parallel in a staggered state. Each pipe heater 4 is arranged in a state protruding from the side surface of the case 1 on the side away from the notch 15 of the case 1 in the case. That is, the pipe heater 4 is arranged in the case 1 in the region directly above or directly below the notch 15, and in the embodiment illustrated in the figure, excluding the space corresponding to the notch.

  In FIG. 2, reference numeral 7 denotes a flow path for discharging the regeneration air after passing through the rotor 5, that is, humidified air, and a flow path for supplying the air to be treated to be dehumidified to the rotor 5. The intake / exhaust device in the desiccant device which comprises is shown. Reference numeral 8 denotes a blow-out device in a desiccant device that constitutes a flow path of dehumidified air obtained by passing the rotor 5.

  In the present invention, in order to reduce the short path of the adsorbent regeneration air blown from the fan to the rotor 5, directly above or directly below the notch portion 15 in the case 1 (in the embodiment illustrated in the figure, directly above the notch portion. ) Is provided with a baffle plate 6 for suppressing the flow of air from the air inlet 2 to the air outlet 3. For example, when three pipe heaters 4 are provided as shown in the figure, the baffle plate 6 has at least the position of the gap on the rotor side of the two gaps between the heaters in the space in the case 1 on the tip side of these pipe heaters. It is arranged at both of the gaps at one place, preferably at two places. Thereby, the contact efficiency with the pipe heater 4 of the air blown from a fan can be improved.

  In the desiccant device, air for regeneration of the adsorbent is blown from the fan to the water vapor desorption region of the rotor 5 through the heating device 1A. At that time, in the heating device 1A of the present invention, a simple structure in which the air inlet 2 and the air outlet 3 are opened in the front portion and the rear portion of the case 1 and the pipe heater 4 having a low air resistance is accommodated in the case 1 is provided. Therefore, the load on the fan can be reduced.

  Furthermore, in the heating apparatus 1A of the present invention, the air inlet 2 and the air outlet 3 are provided in a state of separating the mutual distance from the front surface and the back surface of the case 1, and the pipe heater 4 having excellent thermal efficiency is provided on the shaft of the rotor 5. 51 is arranged in a state protruding from the side surface of the case 1 opposite to the side 51, and the baffle plate 6 is arranged in the space on the tip side of the pipe heater 4, so that the air from the air inlet 2 to the air outlet 3 The short path phenomenon which bypasses the pipe heater 4 in the flow can be reduced, and the heat of the pipe heater 4 can be sufficiently transferred to the air. As a result, according to the present invention, the power consumption of the heater can be further reduced.

  Further, although not shown, the desiccant rotor heat exchange device according to the present invention replaces the pipe heater 4 described above, for example, by disposing a cooler having a structure for circulating a coolant such as cold water in the pipe. It can be configured as a cooling device. That is, the cooling device is a device that is disposed between the desiccant rotor and the fan of the desiccant device and cools the air blown to the water vapor adsorption region of the desiccant rotor, and has a flow path similar to the heating device 1A. .

  The above cooling device is configured in a box structure with a part cut out, and is arranged close to one end surface of the desiccant rotor with the cutout part along the thickness direction along the axis of the desiccant rotor. The case includes a case and a pipe-like cooler (heat exchanger) that is disposed in a state protruding from the side surface of the case away from the notch and circulates the refrigerant. The cooler is located in the case in the area excluding the space corresponding to directly above or below the notch, and the case front part near the side of the case away from the notch corresponds to the fan diameter. The air inlet corresponding to the water vapor adsorption region of the desiccant rotor is opened in the case back surface portion near the side surface of the case close to the notch portion. And in said cooling device, a baffle plate is arrange | positioned in the space part corresponded directly above or under the notch part in a case, and the flow of the air which goes from an air inlet toward an air outlet is suppressed by the said baffle plate. Thus, the short path phenomenon that bypasses the cooler in the air flow from the air inlet to the air outlet can be reduced, and the cooler heat of the cooler can be sufficiently transferred to the air.

1A: Heating device for desiccant rotor 1: Case 15: Notch 2: Air inlet 3: Air outlet 4: Pipe heater (heat exchanger)
5: Desiccant rotor 51: Shaft 6: Baffle plate

Claims (2)

  In the desiccant device, it is a heat exchange device that is arranged between the desiccant rotor and the fan and that heats or cools the air blown to the desiccant rotor, and the front and back shapes have a box structure with a square corner cut out. A case that is configured and arranged in the vicinity of one end surface of the desiccant rotor with a notch portion along the thickness direction along the axis of the desiccant rotor, and a side surface of the case that is away from the notch portion A pipe-shaped heat exchanger disposed in a state protruding from the inside of the case, and the heat exchanger is a region excluding a space corresponding to the portion directly above or directly below the notch portion in the case. The case front portion near the side surface of the case on the side away from the notch portion has a circular air inlet having a size corresponding to the diameter of the fan. The case back portion near the side surface of the case on the side close to the notch portion has a sector shape having a size corresponding to the water vapor desorption region or the water vapor adsorption region of the desiccant rotor and centered on the notch portion. The air outlet is opened, and a baffle plate for suppressing the flow of air from the air inlet to the air outlet is disposed in the space corresponding to the portion directly above or immediately below the notch in the case. A heat exchange device for a desiccant rotor, characterized in that   The heat exchanger according to claim 1, wherein the pipe-shaped heat exchanger is a pipe heater.

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