JP2011230098A5 - - Google Patents

Description

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.

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.

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 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. Note purge air amount shown in Fig. 3 (ratio) refers to the ratio at which the rotor speed is set to 1 the preferred purge air volume in 10Rph, the purge air volume is too large, the adsorption of moisture in the purge zone proceeds only the supply air dew point is deteriorated. If the purge air volume is too small , 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 insufficient second regeneration air volume.

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 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.

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.

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.

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.

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. 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.