DE3133368A1 - METHOD AND DEVICE FOR DEHUMIDIFYING COMPRESSED GAS, IN PARTICULAR AIR - Google Patents

Description

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The present invention relates to a method for dehumidifying compressed gas, especially Lqft, whereby the gas is first compressed to a pressure higher than the calculated final pressure, and that the gas then expanded to the final pressure. The invention also relates to a device for carrying out the method.

There are often claims regarding one

certain maximum humidity provided by compressed gas. Air that is to be stored in steel cylinders, for example, that is used in connection with diving equipment or smoking equipment should preferably have a relative humidity of less than 70%. The reason for this is that bacteria build up in the air, ice build-up in diving valves and desires to avoid corrosion of the bottle. In the latter case, the increased oxygen partial pressure is too note.

The state trade inspectorate has regulations for the maximum degree of humidity. These However, regulations are difficult to meet and have. led to an expensive mechanical Had to filter.

The cause of compressed gas,

Air, in particular, will be very humid if no special measures are taken to dehumidify, is that the humidity increases in the same proportion as the compression or compression. If you compress 1 liter of air with 50'έ moisture with a pressure of 1 atmosphere to h T.itor with a pressure of 2 atmospheres, the FouchLiykoit will be 100%.

“ ₀ It is known that gas, for example air, is at a higher level

Compress pressure as the calculated final pressure and then expand the air to the calculated final pressure allow. The reason for this is, of course, that the air is dehumidified. For example, if you open your air 300 bar 'compressed, which is then in a compressed state will of course have 100% moisture, and that Then lets the air expand to 200 bar, the

Air at this final pressure will have about 66% humidity, which is LOO χ 200.

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The present invention aims to improve the above method so that in a simple one and cheap way can achieve a stronger dehumidification of the air.

This is achieved in that the gas is cooled before it is expanded to the final pressure by the Cold effect in expansion is used in cooling. One then uses the physical principle that the gas Heat supplied during compression is consumed again during expansion.

When the gas, which has a higher pressure than the calculated final pressure, is _cooled , water is precipitated, 1Γ and it is a feature of the invention that this precipitated liquid is precipitated before the expansion zone.

A device for carrying out the method comprises a line for gas with high compression pressure as well as an expansion valve, and the characteristic is that the line for the gas with high compression pressure is in good thermally conductive contact with the expansion valve stands.

According to one embodiment of the invention, can

this good heat-conducting contact can be achieved by virtue of the fact that a fluid circuit is in heat-exchanging contact with the high pressure line and with the expansion valve.

Another embodiment is characterized by [Leave the high pressure line e.g. in direct mechanically heat-conducting contact with the expansion valve it says that the line is laid in a spiral (helical shape) around the valve.

By means of the method according to the invention a physical principle for almost free dehydration of compressed gas, especially air, is exploited, and ο, - so the previously mentioned expensive and unnecessary annoying filtering.

The invention is described in greater detail below with reference

3133388

explained on the drawing / which in

Fig. 1 shows a first embodiment of a device according to the invention and in

2 shows a second embodiment of a device according to the invention
shows.

In Fig. 1, a line 1 comes from a ^ compressor, and the air has a pressure of e.g. 300 bar. The line 1 is in a helical winding 2 through a Cold chamber 3 out. From the cold chamber, the line 1 goes through a water separator 4 with a Dispensing crane 5. Line 1 is connected from separator 4 an expansion valve 6, which lowers the pressure of the air to e.g. 200 bar in the outgoing line 7 »This is then the desired final pressure. To the expansion valve 6, a liquid chamber 8 is provided through a line 9 and a return line 10 forms a circuit with the cold chamber 3. The whole thing is in a thermally insulated Housing 11 placed.

The facility works in the following way: The warm, moist high pressure air in line 1 of the Compressor comes, gives off heat to the liquid in the cold chamber 3. This liquid gets through the return pipe 10 transported and cooled with the aid of the cooling effect of the expansion in the expansion valve 6. These cooled liquid is then fed through line 9 to chamber 3. This cycle can by means of a Pump 12 can be maintained. By rotating the device by 90 ° with the chamber 3 at the bottom, a thermosiphon effect can be obtained, so that the pump 12 is omitted can be.

In Fig. 2, another embodiment is shown by the line 1 from the compressor, which moist and leads warm air, is guided in a winding 13 around the expansion valve and with this in good heat-conducting contact stands. As a result, the air in the winding 13 is cooled and then through the expansion valve 6 to the outlet 7

guided. In this case, too, a water separator with a valve 5 is provided before the high-pressure gas enters the Expansion valve goes.

Claims (7)

B4TENt4NH * ILTEKartA BROSEDK "BROSE D-B023 Mimchen-Pullach, Wiener Str. 2, Tel. U3tt & l, 7; 93 30 71;, fttex 5« «147 bnos d; ΟφΙββ.« Patontibus »Munich 313 3 3G8 Diplom Ingenieure A / S Löwener, Mohn, Vitaminveien 6, Oslo 4, Norway Your reference: τΒα Your ret. * 8002 - Case 3 D (j; e August 24, 1981 J1 patent claims 1. A method for dehumidifying compressed gas, in particular air, wherein the gas is first compressed to a pressure higher than the calculated final pressure, and the gas then expands to the final pressure by means of an expansion valve, characterized in that the gas is cooled, before it is expanded to _f the ultimate pressure by the refrigeration effect is used in dei expansion on cooling. 2. The method according to claim 1, characterized ' geke η η ζ e i η et, dans auygeschiene liquid ■, is precipitated before the expansion valve. "k-; 3. Device for carrying out the method according to , - ■ I claim 1, comprising a line for gas with high compression pressure and an expansion valve, thereby. ; ■ marked that the line (1) for the High compression pressure gas in good heat conduction · s Is in contact with the expansion valve (6). . · · 4. Device according to claim 3, characterized in that · q <- · K e η π ■ /, fi <: h ii ο t that on the high pressure side ■ unsvHiil. i. Ii-; ei n'Flüssigkf ^ itsaUsJacheider (4) i :. I. 5. Device according to claim 3 or 4, characterized characterized in that the device is thermally insulated. ■ - 6. Device according to claim 3, 4 or 5, characterized in that the thermally conductive contact consists of a Plüssiqkeitskreislauf (3, 8, 9, 10) in heat exchange contact with the high pressure line (1) and the expansion valve (6). 7. Rj'nr if'htim «! n. ^r i <* h claim "5, 4 or 5, characterized in that the high-pressure line (1) is in direct mechanical heat-conducting contact with the expansion valve (6), for example, that the line (1) is in a spiral (helical ) is placed around the valve (6).