JPS61238321A - Adsorption type compressed air dehumidifying apparatus - Google Patents

Abstract

PURPOSE:To reduce the loss of heat energy, by passing high temp. air from a compressor through the heat transfer pipe provided in a moisture absorbing tower to cool the same to a dew point through heat exchange and further dehumidifying the cooled air in the other dehumidifying tower to effectively utilize the emitted heat of the compressor to regenerate the moisture absorbing tower. CONSTITUTION:High temp. air is sent to a moisture absorbing tower 22 from a compressor 28 by opening and closing a solenoid valve to be passed through a heat transfer pipe 30 to perform heat exchange and dehumidified by a precooler 25 and cooled to a low dew point by a cooler 24 to be sent to a moisture absorbing tower 22 and further dehumidified by the adsorbent in the tower 21 while dry air is sent to a necessary part by a solenoid valve 34. A part of this outlet dry air is guided to the moisture absorbing tower 22 during heating regeneration through an orifice 33 to purge evaporated moisture from the adsorbent. Next, a solenoid valve 32 is closed and a solenoid valve 27 is opened to allow high temp. air from the compressor 8 to flow in a direct precooler 25 through the valve 27 and a check valve 26 and only cooled dry air from the tower 21 is flowed to the moisture absorbing tower 22 to cool and activate the adsorbent. This operation is alternately changed over in the moisture absorbing towers 21, 22.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a compressed air humidifier using an adsorbent that can be used in factories that require relatively low humidity air! It is related to.

(Conventional technique #g) Compressed air removal IFJ using conventional adsorbent! Finally, as shown in Figure 3, the air inlets of two columns 4.5 filled with a desiccant such as zeolite are connected via a three-way valve 1, and the air outlets of columns 4 and 5 are connected to each other via a three-way valve 1. 11LFi
In the case where the air outlets of the towers 4 and 5 are connected through the orifice 6 and the magnetic piece 10, the air outlets of the towers 4 and 5 are connected through the i-valves 8 and 9 and the check valve 7, respectively. The heater 1 is connected to the heater 1 through the solenoid valves 11 and 12 and the check valve 7.
3 and a blower 14 are known.

When compressed air is continuously dehumidified and dried to obtain a low dew point, towers 4 and 5 filled with adsorbent such as zeolite are used.
Compressed air is sent into one of the towers for drying, while hot air is passed from a heating means into the other tower to allow moisture in the adsorbent to evaporate and regenerate it. Furthermore, the relatively cold air from the drying tower outlet is transferred to the IE magnetic piece 0. The inside of the regeneration tower is cooled and activated by sending hot air into the regeneration tower through the orifice 6 and opening the 1E magnetic valve of the tower to discharge the hot air to the outside. The amount discharged to the outside (purge amount) has a purge rate of about 10 to 15% with respect to the total amount of air.

(Problems to be Solved by the Invention) However, the conventional apparatus has drawbacks such as a large near loss of consumed heating energy or purge. Therefore, a device with small energy and purge near losses was desired.

(Means for solving the problem) A three-way valve 23 that connects the temperature absorbing baths 21 and 22 filled with adsorbent with the air inlets of the temperature absorbing baths 21 and 22, and the three-way valve 2
3 and 1! The adsorption tower 21゜2 consists of a cooled cooler 24, a precooler 25, and an air compressor 28 connected to the precooler 25 through a check valve 26 and a T-magnetic piece 27.
Heat transfer pipes 29 and 30 are installed in the heat transfer pipe 2, and the inlet side of the heat transfer pipe 29 and 30 is connected to the air compressor 28, and the outlet side of the heat transfer pipe 29 and 30 is connected to the reserve via electromagnetic valves 31 and 32. It is connected to the cooler 2S, and the air outlet of the temperature absorbing bath 2L22 is connected through the orifice 33, so that each of the temperature absorbing baths 2
The exhaust port 1.22 is connected to the outside via electromagnetic valves 34 and 35.

(Function) In the apparatus of the present invention with the above-described configuration, when the i hot bath 21 is used for moisture absorption by opening and closing the solenoid valve, the high temperature air from the compressor r! Ar! After being sent to the first tower 22 and subjected to heat exchange in a heat transfer pipe, it is sent to a pre-cooling unit 125 and removed. Furthermore, the dehumidified air is sent to a cooler, where it is made into dry air with a dew point of -40°C or less, and moisture absorption g & 2
Sent to 1. This sent dehumidified dry air is absorbed by the adsorbent filled in the tower 21. It can be discharged to the outside via a solenoid valve. The other thermal bath 22 is
Since the adsorbent is heated by the high temperature air passing through the heat transfer pipe, the moisture adsorbed by the adsorbent evaporates. On the other hand, some of the air that has been dehumidified and dried in the temperature absorption bath 21 is sent to the temperature absorption bath 22 which is being regenerated via an orifice, so that the moisture accumulated in the moisture absorption tower is purged to the outside via the T magnetic piece. It can be further cooled down. When the adsorbent has been regenerated to a certain extent, the T-magnetic piece between the compressor and the moisture absorption tower is opened and closed to prevent high-temperature air from flowing into the regenerating bath, and the bath is activated. In this way, while one bath is being used for moisture absorption, the other bath is regenerated, so moisture can be absorbed efficiently.

(Example) The present invention will be explained in detail below according to the example shown in FIGS. 1 and 2.

In FIG. 1, 21 and 22 are temperature absorbing baths filled with an adsorbent, and the suction ports of these towers 21 and 22 are connected to a cooler 24 through the same three-way valve 23. The cooler 24 is equipped with a precooler 25, a check valve 26, and heat transfer pipes 29 and 30 inside each of the heat absorption baths 21 and 22, each of which has an inlet connected to the compressor 28 through a pipe. It's broken. The exits of the heat transfer pipes 29, 30 are connected to check valves 36a, 36b and IE magnetic pieces 1.32, respectively.
It is connected to the precooler 25 via.

The discharge ports of the temperature absorbing baths 21 and 22 communicate with each other via an orifice 33, and each discharge port is connected to a solenoid valve 34.
．． It communicates with the outside via 35. Furthermore, 36 and 37 are
tm valve for discharging moisture away from the adsorbent.

Further, 24a and 25a are drain separators for the cooler 24 and precooler 25, respectively.

Moreover, the one in FIG. 2 shows the case where the air compressor 28 of the first embodiment shown in FIG. A condenser 38 is provided immediately after the discharge port, and a heater 38 is also provided between the condenser 38 and the inlets of the heat transfer pipes 29, 30 of the suction towers 21, 22! Consists of what was done.

A device according to the present invention in the configuration described above! ±,
81 Used for bottom and top.

First, in the first embodiment shown in FIG.
Close the valve 31 and the magnetic piece 27, and open the magnetic piece 32. Then, the hot discharge air from the air compressor 28 (250 ~
300°C), heat transfer pipe 3o, check valve 36b, tm
It flows into the precooler 25 via the valve 32.

At this time, the high temperature air flowing through the heat transfer pipe 30 is
Heat is exchanged with the adsorbent in No. 2, and the temperature drops to about 150 to 200'C. The high temperature air that has flowed into the precooler 25 is lowered to about 40"C in the precooler 2s, where it is condensed, and the drain is discharged to the outside of the machine by the drain separator 25a. The compressed air at ℃ is sent to the cooler 24.
The dew point drops to -17°C as it cools down. The cooled condensed water removed here is drained outside the machine by the drain separator 24a. And dew point -17
The air below °C is passed through the three-way valve 23 to the TFI tower 2I.
The dew point of the dew point is below -70° C. as it is adsorbed by the adsorbent and sent out of the machine via the solenoid valve 34.

On the other hand, this outlet dry air partially passes through the orifice 33 and is guided to the lower part of the heated bath 22 during regeneration with its flow rate restricted, and since the solenoid valve 37 is open, the adsorbent is heated. The moisture that evaporates from time to time is released to the outside (bar・′
;) After water evaporates from the thermoabsorbing bath 22 in the 0th order, it is necessary to cool the thermoabsorbing bath and activate the adsorption capacity. In this case, the solenoid valve 32 is switched from open to closed, and the magnetic piece Z7 is Switch from closed to open. Then air compression! ! 1
The high temperature air from 2B does not flow into the temperature absorbing bath 22, and the magnetic piece 2
7 and directly into the precooler 25 via the check valve 26. Thereafter, dehumidification is carried out in the cooler 24 and the temperature absorbing bath 21 in the same manner as described above. In addition, dry air that has also been cooled by the temperature absorption bath 21 flows into the temperature absorption bath 22, so that the temperature absorption bath 21 can be completely cooled.

In this way, each of the temperature absorbing baths 21 and 22 is connected to the magnetic pieces 27, 31.
By alternately switching and controlling the 32 towers by operating a timer or sequencer as shown in FIG. 4, the compressed air can be lowered to a dew point of -70°C or less.

Next, to explain the embodiment shown in Fig. 2, the discharge temperature of the compressor (of the type with an internal aftercooler etc. built in) is about 40 to 45 degrees Celsius, and at this temperature, the moisture in the adsorbent is It is not possible to evaporate the water, and a temperature of at least about 150'C (because the electromagnetic valve 36 or 37 is open in the regeneration moisture absorption tower and the pressure is atmospheric) is required.

Therefore, the air discharged from the air compressor 28 is heated in advance to about 50 to 55° C. in the condenser 37 of the refrigerator, and further heated to a desired temperature in the heater 38.

Then, as shown in the first embodiment described above, the solenoid valves are operated to regenerate the temperature absorbing bath and to make the air 11% humid. Parts, compressor, expansion valve, etc. are omitted.

(Effects of the Invention) As described above, in the apparatus according to the present invention, the discharge heat of the compressor can be effectively used and the heat absorption bath can be regenerated, so that the thermal energy of the compressor is not wasted. In addition, since the air that has flowed into the regenerated thermal bath is brought to a low dew point using a cooler before the thermal bath, dry air is flowed into the thermal bath to dry it further. This method has the advantage that the amount of adsorbent to be filled is smaller than that of the conventional method, and since the amount of adsorbent used is small, the life of the adsorbent can be used much longer than that of the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus showing one embodiment of the present invention, FIG. 2 is a schematic diagram of a VC arrangement showing another embodiment, and FIG.
4 is a schematic diagram of a device showing the prior art, and FIG. 4 is a time chart showing the operating state of the electromagnetic valve and the device using a timer or sequencer.

Claims (3)

[Claims] (1) a heat transfer pipe 29 filled with an adsorbent;
moisture absorption towers 21 and 22 to which 30 is piped, and the moisture absorption tower 21,
It consists of a three-way valve 23 connected to the air intake port 22, a cooling/dehumidifying means communicating with the inlet of the three-way valve 23, and an air compressor 28 connected to the cooling/dehumidifying means. Inlets 29 and 30 are connected to the air compressor 28,
The outlets of the heat transfer pipes 29 and 30 are connected to solenoid valves 31 and 3, respectively.
2 to a cooling/dehumidifying means, and a moisture absorption tower 21
, 22 communicate with the outside via electromagnetic valves 34 and 35, and communicate with each other via an orifice 33. (2) The cooling/dehumidifying means includes the cooler 24 and the preliminary cooler 2
5. An adsorption type compressed air dehumidifier according to claim 1, characterized in that the adsorption type compressed air dehumidifier comprises: (3) Adsorption type compression according to claim 1 or 2, characterized in that a condenser and a heater are connected between the air compressor 28 and the heat transfer pipes 29, 30. Air dehumidifier.