JPS6249929A - Dehumidifier - Google Patents

Abstract

PURPOSE:To dehumidify at low cost and with high efficiency by utilizing an unpermeated air flow which is not permeated and still retaining its high pressure as the driving force for an air pump to reduce the pressure on the permeated steam side of a selective separation membrane. CONSTITUTION:A driving part 8 for an air pump 7 to suck the permeated air side is arranged on the outlet side of the unpermeated air side of a separation module 3. The air 1 to be dehumidified is compressed and sent to the separation module 3, the pressure on the outlet side of the permeated steam side is reduced by the suction of the air pump 7 and a part of steam is selectively permeated by a selective separation membrane 4. An unpermeated air flow 5 which is not permeated through the separation membrane 4 and still retaining its high pressure is used to drive a pump 9 of the air pump 7 and the flow after being used is returned to the inside of the system as dry air 10. The permeated steam flow 6 which is kept at reduced pressure by the air pump 7 driven by the unpermeated air flow 5 is discharged to the outside of the system by the pump 9.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a dehumidifier using a selective separation membrane.

(Background Art) Generally, in a dehumidification method using a so-called moisture permeable membrane which is a selective separation membrane, the greater the difference in water vapor partial pressure before and after the i3i'l membrane, the greater the moisture permeation rate.

However, in the conventional dehumidification method using a moisture permeable membrane,
As described in Japanese Patent Publication No. 15349'4, many devices simply reduce the pressure on the outlet side of this moisture permeable membrane, and the water vapor partial pressure difference before and after this moisture permeable membrane is increased with a simple and inexpensive structure. There was no.

(Object of the Invention) The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and its object is to provide a dehumidifier that can dehumidify at low cost and with high efficiency using a selective separation membrane. be.

(Disclosure of the Invention) The gist of the present invention is to separate moisture in the air using a selective separation membrane 4 and create dehumidified air (dry air).
In a dehumidifier that returns moisture into the system and releases the moisture permeated through the selective separation membrane 4 to the outside of the system, a pressurizer 2 is installed on the inlet side of the separation module 3 using the selective separation membrane 4. At the same time, a pump 9 of the air pump 7 for suction is arranged on the permeate side of the outlet side, and a drive part 8 of the air pump 7 is arranged on the non-permeate side of the outlet side of the separation module 3.
This dehumidifier is characterized in that the pump 9 of the air pump 7 for suction is driven by the pump 9.

Hereinafter, this invention will be explained based on an illustrative embodiment.

2 indicates a flow of air to be dehumidified, 2 is a pressurizer that pressurizes air 1, 3 is a separation module using a selective separation membrane 4, and 5 is an impermeable material that does not pass through this selective separation membrane 4. 6 is a permeate flow passing through this selective separation membrane 4, 7 is an air pump, 8 is a drive unit for the air pump 7, and 9 is a pump for the air pump 7.

10 is dry air to be returned to the system, 11 is air containing moisture extracted from the treated air of 1,
It is released outside the system.

Selection 11Q4 for removing moisture from the air is made of a polymeric material such as cellulose acetate, Vycor glass with fine holes of several tens of angstroms, and ceramic. Films made of ￥f# film are used by laminating or wrapping.

Air 1 to be dehumidified is pressurized by a pressurizer 2 and sent to a separation module 3, in which a portion of water vapor is selectively permeated by a selective separation membrane 4. This is the permeate stream 6 that passes through the selective separation membrane 4. When the permeate stream 6 passes through the selective separation membrane 4, the pressure is reduced.

On the other hand, the non-permeate stream 5 that does not pass through the selective separation membrane 4 still remains at a high pressure, and this high-pressure non-permeate stream 5 is used to rotate the pump 9 of the air pump 7, and is depressurized by use. It is returned to the system as dry air 10.

On the other hand, the air pump 7 driven by the non-permeable flow 5 maintains the permeate flow 6, most of which is water stem air, at a reduced pressure. The permeate stream 6 passing through the selective separation membrane 4 is reliably and effectively maintained at a reduced pressure by the pump 9 of the air pump 7 driven by the non-permeate stream 5. This permeate flow 6 is discharged outside the system by a pump 9.

As described above, in this invention, the supply side of the air to be dehumidified to the selective separation membrane 4 is made into a pressurized system, and the permeation outlet side of the selective separation membrane 4 is made into a reduced pressure system, thereby selectively The difference in water vapor partial pressure between the inlet and outlet of the separation membrane 4 can be increased to increase the water vapor transmission rate. However, since the driving force of the air pump 7 to reduce the pressure on the permeate outlet side of the selective separation membrane 4 utilizes the non-permeate stream 5 which does not pass through the selective separation membrane 4 and remains at a high pressure, it is not economical. It has the advantage of being cheap to operate. In addition, to achieve this purpose, it is only necessary to connect the pump 9 of the suction air pump 7 driven by high-pressure air to the separation module using the selective separation membrane 4.
It has the advantage of simple configuration.

(Effects of the Invention) As described above, the dehumidifier of the present invention has a selection ratio of 1iiIt.
The driving force of the air pump 7 to reduce the pressure on the permeation outlet side of the membrane 4 is pressurized air to create a pressure difference between the inlet and outlet of the selective separation membrane 4, and the air is pressurized to create a pressure difference between the inlet and outlet of the selective separation membrane 4. Since it utilizes the non-permeable stream 5 which remains at high pressure, it can be operated economically.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. 1 indicates a flow of air to be dehumidified, 2 is a pressurizer, 3 is a separation module, 4 is a selective separation membrane, 5 is an unpermeable flow, 6 is a permeate flow, 7 is an air pump, and 8 is a drive unit for the air pump 7 , 9 is the pump of the air pump 7, 10 is dry air to be returned into the system, and 11 is water vapor to be released outside the system.

Claims (1)

[Claims] (1) Separate moisture in the air using a selective separation membrane 4,
While returning the dehumidified air to the system, this selective separation membrane 4
In a dehumidifier that releases the moisture permeated by the filter to the outside of the system, a pressurizer 2 is placed on the inlet side of a separation module 3 using a selective separation membrane 4, and an air pump 7 for suction is placed on the permeation side of the outlet side. A pump 9 is disposed, and a drive section 8 of the air pump 7 is disposed on the non-permeate side of the outlet side of the separation module 3.
A dehumidifier characterized in that this drive unit 8 drives a pump 9 of an air pump 7 for suction.