JP3362902B2 - Dry gas production equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a dry gas, and more particularly to a dry gas capable of changing a flow rate of a dry gas required for dehumidifying a wet gas according to the flow rate of the wet gas. Related to a manufacturing apparatus. [0002] Conventionally, feeding the wet gas to the primary side of the hollow fiber (generally inside), send a drying gas to the secondary side (typically outside), to produce a dry gas from the wet gas The method is known. Dry gas sent to the secondary side at this time
As is also known to use a portion of the dried gas generated from the primary side. In this case, the required amount of the dry gas is controlled according to the supply amount of the wet gas. This method is advantageous because no other dry gas is required. In performing such a method, it is conceivable that the supply amount of the dry gas is controlled by a needle valve in accordance with the flow rate of the wetting gas. The gap between the opening of the needle valve element and the valve seat is extremely small (several microns to several tens of microns), especially when the gas flows at a low flow rate (about 5 to 20 N l / min). Fine dust in the air adheres to the minute gaps, gradually closing the flow path, causing a complete blockage due to a decrease in the flow rate, and has a disadvantage that it is difficult to obtain a gas at a stable flow rate for a long time. In order to avoid such a drawback, there has been proposed a method of constantly monitoring the amount of supplied gas and its pressure and automatically controlling the flow rate based on the signal.
Such a device requires expensive and large-scale devices such as a computer and an IC, and has disadvantages such as requiring a device and an installation place several stages more expensive than the main body of the gas supply device. SUMMARY OF THE INVENTION The present inventor has eliminated the above-mentioned drawbacks and has an apparatus for producing a dry gas capable of changing the amount of the dry gas for drying the wet gas in accordance with the flow rate of the wet gas with a simple apparatus. As a result of various studies for the purpose of providing a gas, the above-mentioned object can be achieved by a configuration in which the flow rate of the dry gas for drying the gas to be dried can be easily changed manually according to the flow rate of the gas to be dried. I found that. [0006] Thus, the present invention, the wet gas to the primary side of the hollow fiber, the apparatus for producing a dry gas is dehumidified wet gas sent respectively hollow fiber of the secondary side to the drying gas,
Part of the dry gas dehumidified through the primary side of the hollow fiber
A branch pipe passing through the secondary side of the hollow fiber, and the primary side of the hollow fiber
A circuit provided with multiple holes of different sizes to communicate the secondary side
A rotating cock, and rotating the cock to
By aligning a desired one of the holes with the branch pipe.
Ri, in accordance with the flow rate of the wet gas, to provide an apparatus for manufacturing dry gas so as to control the flow rate of dry <br/>燥gas through the secondary side of the hollow fiber. Hereinafter, the present invention will be described with reference to the drawings. FIG.
1 is a perspective view showing an example of a dry gas producing apparatus according to the present invention. Reference numeral 1 denotes a cock, and large, medium, and small holes 2, 3, and 4 (not shown because 4 is on the back side of the drawing) are provided on the peripheral surface thereof. 5 is a branch pipe for the drying gas. Wet gas enters from the inlet 6, dehumidified through the primary side of the hollow fiber 7 (the inner side) is taken out consist outlet 8 and a drying gas. Portion of the dried gas is guided to the branch pipe 5, the branch pipe 5 by rotating the cock 1, the large communicating with the secondary side (outer side) of the middle hollow fiber Re et provided on its peripheral surface, in, Small holes 2, 3,
4 Thus, the dry gas exiting the primary side of the hollow fiber 7 flows to the secondary side of the hollow fiber 7 and dehumidifies the wet gas passing through the primary side of the hollow fiber 7. In this case, when a large amount of wet gas is sent to the primary side of the hollow fiber 7, the cock is turned so that the large hole provided on the peripheral surface of the cock communicates with the branch pipe, and the amount of the wet gas is reduced. If the number is small, the cock may be turned so that the small hole provided on the peripheral surface of the cock communicates with the branch pipe. Reference numeral 9 denotes an outlet for the wet gas passing through the secondary side of the hollow fiber 7. When the ratio of the dry gas flowing through the outlet 8 to the dry gas flowing through the branch pipe 5 is about 70 to 85% by volume and the latter is about 15 to 30% by volume, the gas amount for dehumidifying the wet gas This is preferable because the loss is small and the dehumidification of the wet gas can be sufficiently performed. As the gas which can use the apparatus of the present invention, any gas can be used, but it is particularly preferable to use it for drying air. The hollow fibers used in the present invention include, for example, JP-A-54-11481 and JP-A-54-15257.
9, JP-A-60-183025, JP-A-61-1951
17, water-absorbing polymer membranes described in JP-A-62-42723, JP-A-53-86684, JP-A-60-257
819, JP-A-60-261503, JP-A-62-42
772 and the like, a porous membrane of polypropylene, a porous membrane of polytetrafluoroethylene, and a composite membrane of these with other membranes; an aromatic polyimide membrane described in JP-A-62-42723; An ion exchange membrane, a hydrocarbon ion exchange membrane, a composite membrane of an ion exchange membrane and a water-absorbing polymer membrane, or the like can be used. Among them, ion exchange membranes are ideal for drying wet gas,
The ion exchange membrane is preferably a perfluorosulfonic acid type cation exchange membrane made of a copolymer having the following structural formula. ## STR1 ## In the formula, p and q are positive integers, and the ratio q / p is 2 to 1
6, m is 0 or 1, and n is an integer of 1 to 5. FIG. 1 shows an inner diameter of 0.4 mm and a length of 20 mm.
using a perforated sulfonic acid ion-exchange hollow fiber membrane 250 as shown in Chemical Formula 1 and a dry gas producing apparatus in which the membrane is bundled in a U-shape, using a branch pipe 5 and a large hole 2 provided in a cock 1. To the secondary side of the hollow fiber membrane 7.
125 Nl / min of humid air having a relative humidity of 100% and a temperature of 25 ° C was introduced from the inlet 6 and sent to the primary side of the hollow fiber 7 to be dehumidified to a relative humidity of 15%. [0025] Of the dehumidified air, 25 N l / min was sent to the branch pipe 5 and taken out of the outlet 9 through the hollow fiber 7. The dehumidified air 100 Nl / min was taken out from the outlet 8. This operation was performed continuously for 8000 hours, but there was no blockage of the hole 2 provided in the cock, and a smooth operation could be performed. The branch pipe 5 and the hole 3 provided in the cock 1 are communicated with each other, and the same humid air of 62.5 Nl / min is sent from the inlet 6 to the primary side of the hollow fiber 7 to obtain the obtained dehumidified air. of the gas, Misao sent at a rate of 12.5N liters / min through a hole to the secondary side of the hollow fiber 7 in the branch pipe 5
The crop was performed for about 8000 hours. Similarly, an operation of sending 31 Nl / min of humid air to the primary side of the hollow fiber 7 and sending 6 Nl / min to the secondary side of the hollow fiber 7 from the branch pipe 5 through the small hole 4 (not shown) is performed. This was performed for about 8000 hours. Izu
As in the above case, smooth operation was possible without any trouble. According to the present invention, a dry gas can be produced by reliably sending dehumidified gas to the secondary side of the hollow fiber with a simple device without requiring a large-scale device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for producing a dry gas according to an example of the present invention. [Explanation of Signs] 1: Cock 2: Large hole 3: Medium hole 5: Branch pipe 6: Wet gas inlet 7: Hollow fiber 8: Dry gas outlet

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Terutada Matsui 5-20-2 Omiyadai, Wakaba-ku, Chiba-shi, Chiba Pref. ) Inventor Kiyoyasu Yamazaki 5276-1, Nagachi, Okaya-shi, Nagano Japan Pisco Co., Ltd. 22022 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 53/26, 53/22

Claims (1)

(57) Patent Claims: 1. A wet gas on the primary side of the hollow fiber, the hollow fiber of the secondary side to the dry gas sent dividing the wet gas humidity for each to <br/> dry gas an apparatus for producing, through the primary side of the hollow fiber
Part of the dry gas dehumidified by passing through the secondary side of the hollow fiber
Connect the primary and secondary sides of the branch pipe and hollow fiber
Has a rotary cock with multiple holes of different sizes
Then, rotating the cock, the desired one of the plurality of holes
By matching the holes in the branch pipe, in accordance with the flow rate of the wet gas, apparatus for producing a dry gas so as to control the flow rate of the drying gas through the secondary side of the hollow fiber.