JP5681379B2 - Operation method of dry dehumidifier - Google Patents

Description

  The present invention relates to a dry dehumidifying device (so-called rotor dehumidifier) having two or more regeneration zones.

As a dry-type dehumidifying device using an adsorption rotor, one having a plurality of regeneration zones, for example, two regeneration zones has been proposed (Patent Document 1). According to this, since the second regeneration is performed using the relatively low-humidity air after passing through the purge zone after the first regeneration with the relatively high-humidity air, it is completely closer than before. The rotor can be regenerated to the state, and the moisture reduction performance can be increased.

  Even in such a dry dehumidifier using an adsorption rotor having a plurality of regeneration zones, it is important to save energy by improving the operation efficiency. In this regard, to improve energy efficiency by improving the operating efficiency of the dry dehumidifier using an adsorption rotor, the regeneration air temperature is controlled so that the regeneration outlet temperature becomes constant, and the purge outlet is controlled. There is one that controls the purge air volume so that the temperature becomes constant (Patent Document 2). In this method, when the regeneration outlet temperature reaches a certain value, it is determined that regeneration is completed, and the regeneration air volume is controlled so that the regeneration completion state is always maintained.

  There has also been proposed a method in which the capacity of a heater that detects the regeneration outlet air temperature and heats the regeneration air so that the regeneration outlet air temperature becomes constant is controlled (Patent Document 3). This is intended to achieve an energy saving effect by lowering the regeneration air temperature. In addition, a method of variably controlling the regeneration air volume based on the detection value of a temperature sensor provided on the regeneration zone outlet side has been proposed (Patent Document 4).

JP-A-6-343819 JP-A-11-523 JP 2003-24737 A JP 2002-331221 A

  However, these techniques described in Patent Documents 2 to 4 are all directed to a dehumidifying device including a rotor having one regeneration zone, and the dehumidification including a rotor having two regeneration zones described above. It cannot be applied immediately and effectively to the device. In particular, in the prior art described in Patent Document 3, the dehumidification outlet air dew point is affected by the temperature of the regeneration air and the relative humidity, and therefore the regeneration air temperature cannot be lowered in order to maintain the treatment outlet air dew point. There is a case. In particular, when the treatment outlet air dew point is a low dew point, there is a problem that it is difficult to lower the regeneration temperature and the energy saving effect is lowered. Furthermore, this is simply determined that regeneration is completed when the regeneration outlet temperature reaches a certain value, and the method of controlling the regeneration air volume so as to always maintain the regeneration completion state is as described below. In some cases, the regeneration air volume is excessive, and there is room for further improving the energy saving effect.

  In order to further improve the energy saving performance of the dry dehumidifier, the regenerative air volume is increased when the dehumidification load is large, and the regenerative air volume is decreased when the dehumidification load is small. Although it is considered effective to variably control the air volume to be regenerated, as described above, the air volume to be regenerated for each regeneration area is variably controlled with respect to the dehumidifier having a rotor having two regeneration areas. Since there is no effective method to do this, at the present time, it has been forced to operate with a fixed regeneration air volume.

  The present invention has been made in view of the above points, and provides a practical method for variably controlling the amount of regeneration air in a dehumidifying apparatus having a rotor having a plurality of regeneration zones. It aims at improving the operation efficiency and energy-saving effect of a dehumidification apparatus provided with the rotor which has.

  As a result of investigations by the inventors, it is an apparatus for dehumidifying the processing air by passing the processing air through a rotatable rotor, and the air passage area located on the end face side of the rotor is the rotation of the rotor. In the dry-type dehumidifying apparatus, the air is divided into a dehumidification zone, a first regeneration zone, a second regeneration zone, and a purge zone in order, and the entire amount of air after passing through the purge zone is introduced into the second regeneration zone. As shown in FIG. 1, it was found that there is a relationship between the air volume introduced into the first regeneration zone (first regeneration air volume) and the supply air dew point.

  That is, when the air volume is decreased from the state where the first regeneration air volume is excessive (A), the supply air dew point hardly changes until (B) (optimum value) in the figure, but if the air volume is further decreased, the air supply is reduced. The dew point gradually deteriorates ((C) in the figure). Further, the optimum value (B) of the first regeneration air volume becomes (B) → (B) ′ when the humidity reduction load becomes small due to a decrease in the humidity of the air to be treated or a decrease in the air volume to be treated. Change.

  Based on this new knowledge, the inventors pay attention to the temperature distribution of the outlet air in the first and second regeneration zones so that the first regeneration air volume is always the optimum air volume of (B) or (B) ′. The above-described problem is sought to be variably controlled according to the dehumidifying load.

  This will be described in more detail in order. First, as can be seen from the relationship between the first regeneration air volume and the temperature distribution of the first and second regeneration area outlet air shown in FIG. 2, the first regeneration air volume is excessive. At time (A), in the first stage of regeneration in the first regeneration zone, the rotor is heated by the high temperature regeneration air. At a stage where the rotation of the rotor has slightly advanced, a large amount of moisture adsorbed on the rotor comes to be desorbed, and there appears an area where the outlet air temperature of the first regeneration zone hardly changes due to the heat of desorption of moisture at that time. .

  As the rotation of the rotor further proceeds, regeneration of the entire rotor approaches a complete state and the influence of desorption heat is reduced, and the temperature of the outlet air in the first regeneration zone rises. Finally, the outlet air temperature in the first regeneration zone becomes equal to the introduced air temperature, and the regeneration of the rotor in the first regeneration zone is completed. Here, “the state where the regeneration of the rotor has been completed” means that the air introduced into the first regeneration zone and the rotor have reached the adsorption equilibrium / thermal equilibrium (the state where moisture does not enter and exit, and the temperature does not enter and exit). Say.

  Next, the rotor moves to the second regeneration zone. Even if the temperature of the air introduced into the second regeneration zone is the same as that of the air introduced into the first regeneration zone, the humidity is low, so that the rotor that has been regenerated in the first regeneration zone is further regenerated. Therefore, the outlet air temperature once decreases due to the heat of desorption of moisture, and after reaching a minimum value at point L in the figure, the outlet air temperature rises again as the regeneration of the rotor approaches completion.

  At this time, when the first regeneration air volume is optimum (B), the rotor moves to the second regeneration area before the regeneration in the first regeneration area is completed, so at the beginning of the second regeneration area. The outlet air temperature is lower than in the case of (A). Thereafter, as the heat regeneration in the second regeneration zone proceeds, the outlet air temperature rises, and finally, the outlet air temperature at the end of the rotor regeneration direction in the second regeneration zone becomes equal to the case of (A). ing. That is, even if the first regeneration air volume is changed from (A) to (B), the state (temperature, adsorption amount) of the rotor at the end of the second regeneration area does not change, and accordingly, the purge area, the dehumidification area It can be said that the dew point of the supply air does not change because the state of the rotor sent to the motor does not change.

On the other hand, when the regeneration air volume is too small (C), the outlet air temperature at the end of the rotor rotation direction in the second regeneration zone is lower than in the cases (A) and (B) in the figure. Therefore, the state of the rotor at the end of the second regeneration zone is in a state where regeneration is insufficient compared to (A) and ( B). In the case of (C) when the regenerative air volume is too small, the rotor in a state where moisture is adsorbed more than (A) and (B) is sent to the purge area and the dehumidification area. Adversely affects the dew point.

  From the above, in the present invention, the dew point of the supply air will not change if the state (temperature, adsorption amount) of the rotor at the end of the second regeneration zone is the same. Whether the first regeneration air volume is excessive or insufficient is determined based on the outlet air temperature, and the air volume of the regeneration air introduced into the first regeneration zone is controlled so that the necessary and sufficient air volume is obtained.

That is, the present invention is a device for dehumidifying the processing air by passing the processing air through a rotatable rotor, and the air passage area located on the end face side of the rotor is in the order of rotation of the rotor. In the dry type dehumidifying device, which is divided into a dehumidification zone, a first regeneration zone, a second regeneration zone, and a purge zone, and the entire amount of air after passing through the purge zone is introduced into the second regeneration zone,
The exit temperature at the point closest to the first regeneration zone in the second regeneration zone is higher than the exit temperature at the point closest to the second regeneration zone in the first regeneration zone, and the rotor rotation direction end in the second regeneration zone The air volume of the regeneration air introduced into the first regeneration zone is controlled without changing the air volume and temperature of the regeneration air introduced into the second regeneration zone so that the outlet temperature at the point becomes equal to or higher than the regeneration end temperature. It is said.

The regeneration end temperature referred to here is the first regeneration by operating the dry dehumidifier while keeping the air volume and temperature of the regeneration air introduced into the second regeneration zone without performing the control in advance. When the regeneration air introduced into the zone and the rotor reach adsorption equilibrium and thermal equilibrium in the first regeneration zone, the rotation in the second regeneration zone when the rotor subsequently rotates and shifts to the second regeneration zone It is the exit temperature (refer FIG. 2) of a direction termination | terminus part. The regeneration end temperature may be lower than the temperature of the air introduced into the second regeneration zone (that is, the regeneration end temperature may be a temperature when the regeneration of the rotor is not completed in the second regeneration zone).

  According to the present invention, the outlet temperature at the point closest to the first regeneration zone in the second regeneration zone is thus higher than the outlet temperature at the point closest to the second regeneration zone in the first regeneration zone ( That is, it means that the exit temperature rises even after the transition to the second regeneration zone, and (A) in FIG. 2 is excluded under such conditions), and the exit at the rotor rotation direction end point in the second regeneration zone. Since the temperature of the regeneration air to be introduced into the first regeneration zone is controlled so that the temperature is equal to or higher than the regeneration end temperature (that is, (C) in FIG. 2 is excluded under such conditions), FIG. As shown in B), it is possible to make the regenerating air volume introduced into the first regeneration area appropriate.

  In this case, the outlet temperature at the point closest to the first regeneration zone in the second regeneration zone is higher than the outlet temperature at the point closest to the second regeneration zone in the first regeneration zone, and the rotor in the second regeneration zone. When the exit temperature at the end point in the rotational direction is equal to or higher than the regeneration end temperature, the exit temperature at the reference point near the first regeneration area in the second regeneration area is checked in advance, and this is set as the target temperature. In an actual apparatus, it is more practical to control the air volume of the regeneration air introduced into the first regeneration zone so that the outlet temperature of the air reaches the target temperature.

  In this case, the temperature measurement position by the temperature sensor (as viewed in the rotation direction of the rotor) may be any position on the exit side of the second regeneration zone, but the temperature sensor is located near the end of the second regeneration zone. Is small, the change in the detected temperature with respect to the change in the first regeneration air volume becomes small, and it is difficult to determine the increase or decrease in the first regeneration air volume (in accordance with FIG. 2, (A) and (B ) Makes it difficult to discern the difference in air volume), and control becomes difficult. Therefore, this problem can be avoided by setting the position closer to the first regeneration area than the position (point L) at which the second regeneration area outlet air temperature in FIG. Usually, the position indicating the minimum (point L) is the central portion in the second reproduction area, so the reference point may be set at a point closer to the first reproduction area in the second reproduction area.

  In addition, the target temperature at the measurement position determined in this way is a temperature lower than the regeneration end temperature, by checking the tendency of the temperature change of the outlet air from the measurement position to the end of the second regeneration zone in advance. In addition, a temperature at which the outlet air temperature at the end of the second regeneration zone reliably reaches the regeneration end temperature may be set as the target temperature. As a result, the intended purpose can be achieved with the minimum necessary amount of the first regeneration airflow.

  Further, instead of measuring the outlet temperature at such a reference point, the temperature of the regenerated air after passing through the second regeneration zone that has lost the temperature distribution after passing through the second regeneration zone becomes the target temperature. You may make it control the air volume of the reproduction | regeneration air introduced into 1 reproduction | regeneration area.

Air that has lost its temperature distribution due to mixing after passing through the second regeneration zone, for example, is naturally created on the downstream side of the duct after leaving the second regeneration zone. When the flow path becomes long, there may be a case where the average temperature of the air after passing through the second regeneration zone to be measured originally cannot be accurately measured due to heat loss from the duct. Therefore, for example, the air after passing through the second regeneration zone may be agitated, and the temperature after the agitation may be measured using the air as the measurement target air. Such agitation may be performed by a damper, a propeller, a current plate , a fan, or an elbow provided in a duct through which air flows after passing through the second regeneration zone, for example.

  As long as the rotational speed of the rotor does not change, it is preferable to control the air volume of the regeneration air introduced into the second regeneration zone to be constant.

As shown in FIG. 3, this is because the purge air volume (= second regeneration air volume) has a suitable condition (a condition in which the supply air dew point is lowest at the rotor speed) according to the rotor speed. However, if the purge air volume is too much or too little, the supply air dew point will deteriorate. For this reason, as long as the rotor speed does not change, it is desirable to keep the second regeneration air flow constant and to keep the purge air flow always in a suitable condition. The purge air volume (ratio) shown in FIG. 3 means the ratio when the preferred purge air volume is 1 when the rotor rotational speed is 10 rph. If the purge air volume is too small, the adsorption of moisture in the purge zone proceeds. only the supply air dew point is deteriorated. If the purge air volume is too large, the supply air dew point deteriorates due to insufficient cooling of the rotor in the purge zone, and the supply air dew point deteriorates due to the insufficient second regeneration air volume.

  It should be noted that when the rotor rotational speed is changed, the preferred purge air volume changes. For example, if the rotor speed is reduced to ½ (for example, 10 rph → 5 rph), the rotor residence time in the purge zone is doubled. Therefore, the purge air volume required for cooling the rotor is reduced to 1/2 of the original, and the preferable purge air volume is also reduced to about 1/2 of the original air. Thus, it can be seen that the preferred purge air volume is generally “proportional” to the rotor speed. When the rotor speed is changed, the second regeneration air volume (= purge air volume) is changed in proportion to the rotor speed. It is desirable to make it.

  Furthermore, according to the present invention, the air passing area located on the end face side of the rotor is divided into a dehumidifying area, a first regeneration area, a second regeneration area, a third regeneration area, and a purge area in the order of rotation of the rotor. In addition, the present invention can be applied to a dry type dehumidifying device in which the entire amount of air after passing through the purge zone is introduced into the third regeneration zone, and the same operational effects as those having the above two regeneration zones can be obtained. It is.

In this case, the outlet temperature at the point closest to the first regeneration zone in the third regeneration zone is higher than the outlet temperature at the point closest to the third regeneration zone in the first regeneration zone, and the rotor in the third regeneration zone. Regeneration air introduced into the first regeneration zone without changing the air volume and temperature of the regeneration air introduced into the second regeneration zone and the third regeneration zone so that the outlet temperature at the end point in the rotation direction is equal to or higher than the regeneration end temperature. What is necessary is just to control the air volume. However, in this case, the regeneration end temperature means that the dry dehumidifier is operated with the air volume and temperature of the regeneration air introduced into the second regeneration zone and the third regeneration zone constant without performing the control in advance. Then, when the regeneration air introduced into the first regeneration zone and the rotor reach the adsorption equilibrium and the thermal equilibrium in the first regeneration zone, the rotor rotates and then moves to the third regeneration zone. 3 is the outlet temperature at the end of the rotational direction in the three regeneration zones.

  In this case as well, as in the case of having the two regeneration zones described above, the exit temperature at the point closest to the first regeneration zone in the third regeneration zone is the exit at the point closest to the third regeneration zone in the first regeneration zone. The exit temperature at the reference point near the first regeneration zone in the third regeneration zone when the exit temperature at the end point in the rotor rotation direction in the third regeneration zone is equal to or higher than the regeneration end temperature is determined in advance. In addition, this may be set as a target temperature, and the air volume of the regeneration air introduced into the first regeneration zone may be controlled so that the outlet temperature at the reference point becomes the target temperature.

Further, instead of measuring the outlet temperature at such a reference point, the temperature of the regenerated air after passing through the third regeneration zone, which has lost the temperature distribution after passing through the third regeneration zone, becomes the target temperature. You may make it control the air volume of the reproduction | regeneration air introduce | transduced into 1 reproduction | regeneration area.
According to still another aspect of the present invention, the present invention provides an apparatus for dehumidifying a processing air by passing the processing air through a rotatable rotor, the air being located on an end surface side of the rotor. The passing zone is divided into a dehumidifying zone, a first regeneration zone, a second regeneration zone, and a purge zone in the order of rotation of the rotor, and the entire amount of air after passing through the purge zone is introduced into the second regeneration zone. In the dry dehumidifier
In the first regeneration zone, at least the regeneration zone outlet temperature of the first regeneration zone may rise from the starting point of the rotor rotation direction to the end point of the rotor rotation direction, so that it does not fall.
In the second regeneration zone, the regeneration zone outlet temperature in the second regeneration zone continues to rise from the start point in the rotor rotation direction to the end point in the rotor rotation direction, and the outlet at the end point in the rotor rotation direction in the second regeneration zone. To make the temperature equal to or higher than the regeneration end temperature,
A method for operating a dry dehumidifying device, characterized in that the air volume of regeneration air introduced into the first regeneration zone is controlled without changing the air volume and temperature of regeneration air introduced into the second regeneration zone.
However, the regeneration end temperature is introduced into the first regeneration zone by operating the dry dehumidifier while keeping the air volume and temperature of the regeneration air introduced into the second regeneration zone constant without performing the control in advance. When the regeneration air and the rotor that have reached adsorption equilibrium and thermal equilibrium in the first regeneration zone are reached, the rotation direction end portion in the second regeneration zone when the rotor subsequently rotates and shifts to the second regeneration zone Is the outlet temperature.

  According to the present invention, when operating a dry dehumidifier equipped with a rotor having a plurality of regeneration zones, the first regeneration air volume can be made appropriate while maintaining the desired supply air dew point. It is possible to improve the driving efficiency and energy saving effect.

It is a graph which shows the relationship between the 1st regeneration air volume and supply air dew point temperature. It is a graph which shows the change of each regeneration area exit air temperature when a rotor rotates and it transfers to the 1st regeneration area and the 2nd regeneration area. It is a graph which shows the relationship between purge air volume (ratio) and a supply air dew point. It is explanatory drawing which showed typically the outline of the system | strain of the dry-type dehumidification apparatus for enforcing the operating method concerning embodiment. It is an end face explanatory drawing of the axial direction of the rotor used for the dry-type dehumidifier of FIG. It is explanatory drawing which showed typically the outline of the system | strain of the dry-type dehumidification apparatus using the rotor which has three reproduction | regeneration areas. It is an end surface explanatory drawing of the axial direction of the rotor used for the dry-type dehumidifier of FIG. It is explanatory drawing which showed typically the modification of the system | strain of the air of the rotor which can apply this invention. It is explanatory drawing which showed typically the modification of the type | system | group of the air which can apply the rotor of FIG. It is explanatory drawing which showed typically the modification of the type | system | group of the air which can apply the rotor of FIG. It is explanatory drawing which showed typically the modification of the type | system | group of the air which can apply the rotor of FIG. It is explanatory drawing which showed typically the modification of the type | system | group of the air which can apply the rotor of FIG. It is explanatory drawing which showed typically the modification of the type | system | group of the air which can apply the rotor of FIG. It is explanatory drawing which showed typically the modification of the type | system | group of the air which can apply the rotor of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 4 shows an outline of a system of a dehumidification system using the dry dehumidifier 1 for carrying out the operation method according to the present embodiment, and this system is installed in a low dew point space (not shown). It is configured as a system that supplies low dew point air.

As shown in FIG. 5, the dry dehumidifying device 1 that forms the core of the system has a configuration in which area dividing cassettes 12 and 13 are arranged on both end faces of a rotating rotor 11. On the end surface of the rotor 11, four airs of a dehumidification zone 11a, a first regeneration zone 11b, a second regeneration zone 11c, and a purge zone 11d are arranged in the order of the rotation direction of the rotor 11 indicated by the thick arrows in the rotor 11 of FIG. It is divided into transit areas. A dehumidifying inlet 12a, a first regeneration outlet 12b, a second regeneration outlet 12c, and a purge inlet 12d for connecting to a duct or the like are formed on the outer end surface of the section dividing cassette 12 corresponding to each of the sections. Yes. Note also the outer end face of the zone divided cassette 13, the four dehumidification corresponds to section outlet 13a, the first regeneration inlet 13b, a second regeneration inlet 13c, purge outlet 13d are respectively formed. In the rotor 11 of the dry dehumidifier 10, a hygroscopic material such as lithium chloride, silica gel, or zeolite is accommodated.

  The four passage areas, the dehumidification area 11a, the first regeneration area 11b, the second regeneration area 11c, and the purge area 11d, are each in one of the radially sectioned shapes, that is, substantially fan-shaped when viewed from the end face. In this embodiment, the central angle of each passing zone is 180 ° for the dehumidifying zone 11a, 90 ° for the first regeneration zone 11b, and 90 ° for the second regeneration zone 11c. The central angle of the 45 ° purge area 11d is set to 45 °. Note that the angle of each zone may be set as appropriate in consideration of the airflow ratio.

  The processing target air to be dehumidified is taken in through the processing duct 22 by the processing fan 21 and cooled / dehumidified by, for example, a precooler (not shown), and then the dehumidified area 11a of the rotor 11 and a part thereof are branched. And introduced into the purge zone 11d. Here, the air to be treated refers to air to be dehumidified, such as outside air, room air, and mixed air of outside air and room air (return air). Further, for example, in a so-called series two-stage rotor system, air that has been subjected to a dehumidification process through the dehumidification zone of the first-stage rotor may be used as the second-stage rotor processed air.

  The air that has been dehumidified in the dehumidifying zone 11 a and has a low dew point of −50 ° C. to −70 ° C. is led out from the rotor 11 as supply air through the supply duct 24. Thereafter, for example, after necessary temperature adjustment, the air is supplied to the low dew point space as supply air.

  The air leaving the purge zone 11d is sent to the second regeneration introduction duct 26. A regeneration heater 27 is provided in the second regeneration introduction duct 26, and heats the air that has exited the purge zone 11d. The heated air is sent to the second regeneration zone 11c, and after regenerating the rotor 11 in the second regeneration zone 11c, it is sent to the first regeneration introduction duct 32 through the second regeneration outlet duct 31. The second regeneration outlet duct 31 is provided with a second regeneration damper D2.

  A regeneration heater 33 is provided in the first regeneration introduction duct 32 to heat the air that has exited the second regeneration zone 11c. After the air heated by the regeneration heater 33 regenerates the rotor 11 in the first regeneration zone 11b, a part of the air is sent to the first regeneration introduction duct 32 through the first regeneration outlet duct 37 as a return air passage. It is possible. Accordingly, the first regeneration outlet duct 37 functions as a regeneration circulation duct. The first regeneration outlet duct 37 is provided with a first regeneration damper D1. Then, a part of the remaining air (remaining amount) after regenerating the rotor 11 is directed by the exhaust fan 34 to the first regeneration introduction duct 32 through the exhaust duct 35 (the air flow path leaving the first regeneration zone 11b). The air is exhausted from the exhaust port 36 to the outside through the duct after the first regeneration outlet duct 37 is branched.

From the above, in the dry dehumidifier 1 according to the embodiment, the following relationship is established.
The first regeneration air volume ≧ the second regeneration air volume. The second regeneration air volume = the purge air volume = the exhaust air volume. Note that the first regeneration air volume: the air volume of the regeneration air flowing through the first regeneration zone 11b. The second regeneration air volume: the second regeneration zone 11c. Air flow rate of regenerative air flowing Purge air flow rate: Air flow rate of purge air passing through the purge zone 11d,
Exhaust air volume: An air volume exhausted from the exhaust port 36.

  In the first regeneration zone 11b, the rotor 11 is regenerated by relatively high-temperature and high-humidity air (for example, temperature: 140 ° C., absolute humidity: several tens g / kg (DA)). Therefore, the regeneration of this area is completed with some amount of moisture remaining in the rotor 11. On the other hand, in the second regeneration zone 11c, the rotor 11 is regenerated by air of relatively high temperature and low humidity (for example, temperature: 140 ° C., absolute humidity: 1 g / kg (DA) or less), and in the first regeneration zone 11b. Moisture remaining in the rotor 11 without being desorbed is desorbed in this area.

  Next, the control system will be described. As shown in FIGS. 4 and 5, a temperature sensor 41 for detecting the outlet temperature of the second regeneration zone 11c is installed on the outlet side of the second regeneration zone 11c. Note that the installation position of the temperature sensor 41, that is, the measurement position of the outlet air temperature as viewed in the direction of the airflow, is easily affected by air other than the measurement position when it is away from the outlet of the rotor 11, so For example, it is desirable to be within 100 mm from the rotor 11 outlet.

  The outlet temperature of the air leaving the second regeneration zone 11c detected by the temperature sensor 41 is input to the control unit CU. As shown in FIG. 4, the control unit CU controls the opening degree of the first regeneration damper D1 (for example, PI control) based on the outlet temperature of the second regeneration air detected by the temperature sensor 41.

  That is, the control unit CU controls the first regeneration damper D1 to optimize the first regeneration air volume so that the outlet air temperature of the second regeneration zone 11c detected by the temperature sensor 41 becomes the target temperature. The temperature measurement position by the temperature sensor 41 (as viewed in the rotation direction of the rotor 11) may be any position on the outlet side of the second regeneration zone 11c, but as described above, the outlet of the second regeneration zone 11c. The position closer to the first regeneration zone 11b than the position where the air temperature is minimal (point L) is preferably the temperature measurement position.

The differential pressure at the inlet / outlet of the purge area 11 d of the rotor 11 is detected by a differential pressure gauge 51. The differential pressure gauge 51 may be arranged to detect the differential pressure at the entrance / exit of the second regeneration zone 11c. The difference differential pressure signal of the entrance of the purge zone 11 d which is detected by the pressure gauge 51 (or differential pressure signal of the second regeneration zone 11c), as shown in FIG. 4, is input to the control unit CU. The control device CU can control the second regeneration damper D2 based on the differential pressure at the inlet / outlet of the purge section 11d (or the differential pressure in the second regeneration section 11c). That is, the control unit CU calculates a purge air amount suitable for the rotational speed of the rotor 11, that is, an air amount of purge air passing through the purge zone 11d (or a second regeneration air amount flowing through the second regeneration zone 11c), Using the correlation between the rotor inlet / outlet differential pressure and the ventilation surface wind speed that has been examined in advance, the preferred purge zone differential pressure (or the preferred differential pressure in the second regeneration zone 11c) at the preferred purge air volume is calculated, and the preferred difference is calculated. The second regeneration damper D2 is controlled using the pressure as a target value.

  Note that when the rotor rotation speed is fixed, the purge air volume and the second regeneration air volume may be constant, so that it seems unnecessary to control the second regeneration damper D2, but the first regeneration air volume ( When the amount of opening of the first regeneration damper D1 is changed when the amount of regeneration air passing through the first regeneration zone 11b is variably controlled, the purge air amount and the second regeneration air amount are also affected. For example, when the first regeneration damper D1 is throttled, the pressure on the outlet side of the first regeneration damper D1 decreases, and the purge air volume and the second regeneration air volume increase. If this happens, the purge air volume will deviate from the preferred condition, or the tendency of the temperature change of the outlet air of the second regeneration zone 11c will change. However, it is desirable to control the second regeneration damper D2 so that the purge zone differential pressure (or the second regeneration zone differential pressure) is always maintained in a suitable state.

  The control device CU can variably control the rotational speed of the rotor 11 by controlling the inverter of M of the rotor drive motor. In this variable control of the rotor speed, for example, the speed of the rotor 11 may be controlled so that the detection value of the dew point meter S provided in the path of the air supply duct 24 becomes the target value, or the air to be treated is introduced. For example, when the dew point of the air to be treated is higher than a predetermined value, the rotational speed of the rotor 11 is increased by the detection value of a dew point meter (not shown) provided in the processing duct 22 to be determined. When the value is equal to or less than this value, the rotational speed of the rotor 11 may be controlled to decrease.

  By performing such variable control of the rotor speed, excessive dehumidification is not performed during periods when the dehumidification load is small (so that the air supply dew point is almost constant regardless of the dehumidification load). The number of rotations of the rotor 11 can be automatically reduced. If the rotational speed of the rotor 11 is decreased, the staying time of the rotor 11 in each section is increased, and the first regeneration air volume, the second regeneration air volume, and the purge air volume can be further reduced. Becomes even larger.

  The dehumidifying system having the dry dehumidifying device 1 has the above-described configuration, and the control unit CU is configured so that the outlet air temperature of the second regeneration zone 11c detected by the temperature sensor 41 becomes the target temperature. The one regeneration damper D1 is controlled to control the amount of regeneration air introduced into the first regeneration zone 11b (first regeneration amount). As described above, the target temperature is the exit temperature at the point closest to the first regeneration zone 11b in the second regeneration zone 11c, and the exit at the point closest to the second regeneration zone 11c in the first regeneration zone 11b. The outlet temperature of the second regeneration zone 11c when the outlet temperature at the end point in the rotor rotation direction in the second regeneration zone 11c is equal to or higher than the regeneration end temperature. It was something that was checked by driving.

  Therefore, it is possible to realize the outlet temperature profile of the regeneration area shown in FIG. 2B by appropriately setting the air volume of the regeneration air introduced into the first regeneration area 11b (first regeneration air volume). Thus, it is possible to reduce the first regeneration air volume to the minimum necessary air volume, and to reduce the necessary processing heat amount of the regeneration heater 33.

Using the dry dehumidifier 1 shown in FIG. 4 , according to the present embodiment, only the first regeneration air volume is variably controlled, and the energy saving effect when the rotor rotation speed, purge air volume, and second regeneration air volume are kept constant. Is shown in Table 1.

  According to this, when the absolute humidity of the air to be treated is changed from the high load condition to the low load condition, when the first regeneration air volume is fixed without performing the variable control, the processing heat amount of the regeneration heater 33 is 20%. Diminished. On the other hand, when the variable control was performed, the first regeneration air volume automatically decreased, and the amount of heat processed by the regeneration heater 33 decreased by 36%. Therefore, it can be seen that by implementing the present invention, the amount of energy used at low load can be reduced.

  Further, the supply air dew point under the low load condition was 8 ° C. lower than the supply air dew point under the high load condition. If the rotor rotational speed is variably controlled so that excessive dehumidification is not performed under low load conditions (in this case, for example, the rotor rotational speed is decreased to increase the supply air dew point by 8 ° C.), the first regeneration air volume, Since the second regeneration air volume and the purge air volume can be further reduced, the processing heat amount of the regeneration heater 33 is further reduced, the processing heat amount of the regeneration heater 27 is also decreased, and the energy saving effect is further increased.

The rotor 11 used in the above embodiment has only one dehumidifying area 11a. Of course, the rotor 11 has two dehumidifying areas, and the air treated in one dehumidifying area is the same. There are also applications in devices that process in other dehumidifying areas of the rotor.

  Further, as in the case of the rotor 11 shown in FIGS. 6 and 7, the present invention can be applied to a rotor having three regeneration areas of the third regeneration area 11c ′ in addition to the first regeneration area 11b and the second regeneration area 11c.

In such a case, the temperature sensor 41 is installed in place of the second regeneration zone 11 c near the third play area 11c '. Note that the second regeneration zone 11 c, the air after passing through the third regeneration zone 11c 'is introduced after being heated by the regeneration heater 61, the third regeneration zone 11c', passes through the purging zone 11d Air is introduced after being heated by the heater 27 . The air that has passed through the second regeneration zone 11c is heated by the regeneration heater 33 and then introduced into the first regeneration zone 11b.

  In addition, this invention is applicable also to the dry-type dehumidification apparatus shown in FIGS. 8 to 14 show modified examples of the dry-type dehumidifier using the rotor 11 shown in FIGS. 4 and 5. In these drawings, only the air system is shown, and the fan and the damper are shown in FIG. Not shown. Also, the temperature sensor 41 and the control unit CU are not shown, but the temperature sensor 41 is installed in the second regeneration zone 11c, and the control by the control unit CU is shown in FIGS. This is the same as that of the dry dehumidifier 1 using the illustrated rotor 11. Hereinafter, a configuration different from the apparatus shown in FIGS. 4 and 5 will be described.

Example shown in FIG. 8 is not provided with a first regeneration outlet duct 37 of FIG. 4, in the first regeneration zone 11b, only the air leaving the second regeneration zone 11c is introduced, first reproduction ku zone 1 1b This is an example of exhausting all of the air that has exited.

  The example shown in FIG. 9 is an example in which mixed air of air that has exited the second regeneration zone 11c and air that has exited the first regeneration zone 11b is introduced into the first regeneration zone 11b.

The example shown in FIG. 10 is an example in which the air leaving the second regeneration zone 11c is exhausted as it is, and only the air that has heated the outside air to the regeneration heater 33 is introduced into the first regeneration zone 11b.

  The example shown in FIG. 11 is an example in which the air after leaving the dehumidifying zone 11a is introduced into the purge zone 11d, and the others are the same as the example of FIG.

  The example shown in FIG. 12 is different from the example shown in FIG. 8 in that the air after leaving the dehumidifying zone 11a is introduced into the purge zone 11d, and the rest is the same as the example shown in FIG. is there.

  The example shown in FIG. 13 differs from the example shown in FIG. 9 in that the air after leaving the dehumidifying zone 11a is introduced into the purge zone 11d, and the rest is the same as the example shown in FIG. is there.

  The example shown in FIG. 14 is different from the example shown in FIG. 10 in that the air after leaving the dehumidifying zone 11a is introduced into the purge zone 11d. is there.

  As described above, in the examples shown in FIGS. 8 to 14 as well, although there is some difference in pressure loss due to the difference in the air system, the effect of the present invention can be obtained as it is.

  INDUSTRIAL APPLICABILITY The present invention is useful for a dry dehumidifier having a rotor having a plurality of regeneration zones, and is particularly useful for use in a condition where only 50% or less of return air from the room can be taken in as air to be treated. .

DESCRIPTION OF SYMBOLS 1 Dry type dehumidification apparatus 11 Rotor 11a Humidification area 11b 1st reproduction | regeneration area 11c 2nd reproduction | regeneration area 11d Purge area | region 12 and 13 Area division | segmentation cassette 22 Processing duct 24 Supply duct 26 2nd reproduction | regeneration introduction duct 27, 33, 61 Regeneration heater 31 Second regeneration outlet duct 32 First regeneration introduction duct 34 Exhaust fan 35 Exhaust duct 36 Exhaust outlet 37 First regeneration outlet duct 51 Differential pressure gauge CU controller D1 First regeneration damper D2 Second regeneration damper M Rotor drive motor S Dew point meter

Claims (7)

An apparatus for dehumidifying the processing air by passing the processing air through a rotatable rotor, wherein the air passing area located on the end face side of the rotor is in a dehumidifying area along the rotation order of the rotor, In the dry dehumidifying apparatus, which is divided into a first regeneration zone, a second regeneration zone, and a purge zone, and the entire amount of air after passing through the purge zone is introduced into the second regeneration zone,
The exit temperature at the point closest to the first regeneration zone in the second regeneration zone is higher than the exit temperature at the point closest to the second regeneration zone in the first regeneration zone,
In addition, the air temperature and the temperature of the regeneration air to be introduced into the second regeneration zone are introduced into the first regeneration zone so that the outlet temperature at the rotor rotation direction end point in the second regeneration zone is equal to or higher than the regeneration end temperature. A method for operating a dry-type dehumidifying device, wherein the air volume of regenerated air is controlled.
However, the regeneration end temperature is introduced into the first regeneration zone by operating the dry dehumidifier while keeping the air volume and temperature of the regeneration air introduced into the second regeneration zone constant without performing the control in advance. When the regeneration air and the rotor that have reached adsorption equilibrium and thermal equilibrium in the first regeneration zone are reached, the rotation direction end portion in the second regeneration zone when the rotor subsequently rotates and shifts to the second regeneration zone Is the outlet temperature. The exit temperature at the point closest to the first regeneration zone in the second regeneration zone is higher than the exit temperature at the point closest to the second regeneration zone in the first regeneration zone, and the rotor rotation direction end in the second regeneration zone When the exit temperature at the point is equal to or higher than the regeneration end temperature, the exit temperature at the reference point near the first regeneration area in the second regeneration area is examined in advance, and this is set as the target temperature.
The method of operating a dry dehumidifier according to claim 1, wherein the air volume of the regeneration air introduced into the first regeneration zone is controlled so that the outlet temperature of the reference point becomes the target temperature. The exit temperature at the point closest to the first regeneration zone in the second regeneration zone is higher than the exit temperature at the point closest to the second regeneration zone in the first regeneration zone, and the rotor rotation direction end in the second regeneration zone When the outlet temperature at the point is equal to or higher than the regeneration end temperature, the temperature of the regeneration air after passing through the second regeneration zone where the temperature distribution after passing through the second regeneration zone disappears is checked in advance. Temperature and
Controlling the air volume of the regeneration air introduced into the first regeneration zone so that the temperature of the regeneration air after passing through the second regeneration zone after passing through the second regeneration zone disappears from the target temperature. The operation method of the dry-type dehumidifier according to claim 1, wherein An apparatus for dehumidifying the processing air by passing the processing air through a rotatable rotor, wherein the air passing area located on the end face side of the rotor is in a dehumidifying area along the rotation order of the rotor, In the dry dehumidifying apparatus, which is divided into a first regeneration zone, a second regeneration zone, a third regeneration zone, and a purge zone, and the entire amount of air after passing through the purge zone is introduced into the third regeneration zone,
The exit temperature at the point closest to the first regeneration zone in the third regeneration zone is higher than the exit temperature at the point closest to the third regeneration zone in the first regeneration zone,
In addition, without changing the air volume and temperature of the regeneration air introduced into the second regeneration zone and the third regeneration zone so that the outlet temperature at the rotor rotation direction end point in the third regeneration zone is equal to or higher than the regeneration end temperature , A method for operating a dry-type dehumidifying device, wherein the air volume of regenerated air introduced into a regenerating area is controlled.
However, the regeneration end temperature means that the dry dehumidifier is operated while the air volume and temperature of the regeneration air introduced into the second regeneration zone and the third regeneration zone are kept constant without performing the control in advance. When the regeneration air to be introduced into one regeneration zone and the rotor reach adsorption equilibrium and thermal equilibrium in the first regeneration zone, the third regeneration zone when the rotor subsequently rotates and shifts to the third regeneration zone It is the exit temperature of the rotation direction termination | terminus part in. The exit temperature at the point closest to the first regeneration zone in the third regeneration zone is higher than the exit temperature at the point closest to the third regeneration zone in the first regeneration zone, and the rotor rotation direction end in the third regeneration zone When the exit temperature at the point is equal to or higher than the regeneration end temperature, the exit temperature at the reference point near the first regeneration zone in the third regeneration zone is examined in advance, and this is set as the target temperature.
The method of operating a dry-type dehumidifier according to claim 4 , wherein the air volume of the regeneration air introduced into the first regeneration zone is controlled so that the outlet temperature of the reference point becomes the target temperature. The exit temperature at the point closest to the first regeneration zone in the third regeneration zone is higher than the exit temperature at the point closest to the third regeneration zone in the first regeneration zone, and the rotor rotation direction end in the third regeneration zone When the exit temperature at the point is equal to or higher than the regeneration end temperature, the temperature of the regeneration air after passing through the third regeneration zone after the passage through the third regeneration zone disappears in advance, and this is the target. Temperature and
Controlling the air volume of the regeneration air introduced into the first regeneration zone so that the temperature of the regeneration air after passing through the third regeneration zone after passing through the third regeneration zone is equal to the target temperature. The operation method of the dry dehumidifier according to claim 4 , wherein An apparatus for dehumidifying the processing air by passing the processing air through a rotatable rotor, wherein the air passing area located on the end face side of the rotor is in a dehumidifying area along the rotation order of the rotor, In the dry dehumidifying apparatus, which is divided into a first regeneration zone, a second regeneration zone, and a purge zone, and the entire amount of air after passing through the purge zone is introduced into the second regeneration zone,
In the first regeneration zone, at least the regeneration zone outlet temperature of the first regeneration zone may rise from the starting point of the rotor rotation direction to the end point of the rotor rotation direction, so that it does not fall.
In the second regeneration zone, the regeneration zone outlet temperature in the second regeneration zone continues to rise from the start point in the rotor rotation direction to the end point in the rotor rotation direction, and the outlet at the end point in the rotor rotation direction in the second regeneration zone. To make the temperature equal to or higher than the regeneration end temperature,
A method for operating a dry dehumidifying device, characterized in that the air volume of regeneration air introduced into the first regeneration zone is controlled without changing the air volume and temperature of regeneration air introduced into the second regeneration zone.
  However, the regeneration end temperature is introduced into the first regeneration zone by operating the dry dehumidifier while keeping the air volume and temperature of the regeneration air introduced into the second regeneration zone constant without performing the control in advance. When the regeneration air and the rotor that have reached adsorption equilibrium and thermal equilibrium in the first regeneration zone are reached, the rotation direction end portion in the second regeneration zone when the rotor subsequently rotates and shifts to the second regeneration zone Is the outlet temperature.

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