EP2928584A1

EP2928584A1 - Device and process for drying gases

Info

Publication number: EP2928584A1
Application number: EP13779821.1A
Authority: EP
Inventors: Jürgen Timmler; Elena Kochendörfer; Kilian Stein; Ralf Winkler
Original assignee: Parker Hannifin Manufacturing Germany GmbH and Co KG
Current assignee: Parker Hannifin Manufacturing Germany GmbH and Co KG
Priority date: 2012-12-10
Filing date: 2013-10-21
Publication date: 2015-10-14
Also published as: DE102012112040B4; DE102012112040A1; WO2014090461A1

Abstract

An illustration and description are given of a device and a process for drying gases, in particular for drying methane, comprising: a gas inlet (2), a gas outlet (3), at least two adsorption chambers (4, 5) for receiving desiccant, a cooler (8) which is arranged in the direction of flow between the gas inlet (2) and the adsorption chambers (4, 5), a condensate outlet (9) which is arranged in the direction of flow between the gas inlet (2) and the adsorption chambers (4, 5), and a heater (22), wherein the adsorption chambers (4, 5) are connected to the gas inlet (2) and to the gas outlet (3). In order to achieve a relatively high efficiency, it is proposed to provide a fan (20) which is connected to an intake conduit (L11) and a conduit (L3) for the intake of precooled and predried gas and/or to an intake conduit (L11) and a conduit (L14) for the intake of dry gas for the regeneration.

Description

Apparatus and method for drying gases

The invention relates to a device for drying gases, in particular for drying methane, comprising: a gas inlet, a gas outlet, at least two adsorption chambers for receiving desiccant, a condenser, which is arranged in the flow direction between the gas inlet and the adsorption chambers, a condensate outlet, which is arranged in the flow direction between the gas inlet and the adsorption chambers, and a heater, wherein the adsorption chambers are connected to the gas inlet and to the gas outlet.

The invention also relates to a process for drying gases, in particular for drying methane, comprising the following steps: a) adsorbing moisture from the gas by desiccant in a first adsorption chamber; b) heating the gas prior to introduction into the second adsorption chamber; and c)

Cooling the gas in the second adsorption chamber.

Numerous devices and methods for drying gases are known in practice. One of the reasons for the drying of gases is that gases are used as a working medium in many industrial processes and excessively high humidity can lead to corrosion of the pipes.

Due to the increasing demand for renewable energies, the

Drying of biogas, especially of bio-methane in importance. The drying of methane, however, makes special demands on the safety of the

Drying plant, since methane explodes with oxygen - such as from the

Ambient air - can react. For the drying of gases, different devices, or dryers, are used.

For example, refrigeration dryers are known. Refrigeration dryers regularly have two heat exchangers, an evaporator and a condenser and extract moisture from the gas to be dried by cooling it below its dew point and then reheating it. For this purpose, moist gas is sucked in and passed through a cooling element (the so-called evaporator). In the evaporator, the gas is cooled down so far that the dew point of the gas is exceeded. Since cold gas can store much less moisture than warm gas, the moisture condenses and can be drained off.

In addition, adsorption dryers are known. In adsorption dryers, the moisture to be dried is removed by a desiccant. The gas to be dried is regularly passed for this purpose in an adsorption chamber which is filled with the desiccant. Due to the hygroscopic, so water attracting mode of action of the desiccant, the moisture is removed from the gas. After the adsorption process, the moisture must be removed from the desiccant again; This step is called regeneration. For this purpose, air is sucked in from the environment on a regular basis, heated to high temperatures and passed through the desiccant. Due to the high temperature, the moisture stored in the desiccant evaporates and is in the form of heated

Derived steam. So that the two steps of adsorption and regeneration can take place simultaneously, adsorption dryers with two or more adsorption chambers have prevailed: While adsorption takes place in one chamber, regeneration can take place in the other chamber.

Although adsorption dryers regularly require more energy than refrigeration dryers, they have the advantage over these that gases can be dried to a very low pressure dew point. Adsorption dryers can in turn be divided into two types:

Adsorption, where the regeneration "cold" (ie by pressure change) and adsorption, where the regeneration, as described above, "warm" (ie by temperature change) takes place. The two methods described are also known as "PSA" (pressure swing adsorption) and "TSA" (temperature swing adsorption).

Adsorption dryers are known, for example, from EP 0 382 937 A1 or WO 02/05931 A1. The dryers described there are characterized by a relatively simple construction and an associated robustness. However, a disadvantage is the limited efficiency, which is mainly due to the fact that the removal of moisture must be done solely by the desiccant. This results in relatively long regeneration times. The above-described functions of refrigeration dryers and

Adsorption dryers can be combined with each other; Such dryers are often referred to as hybrid dryers.

EP 2 263 778 A1 relates to such a hybrid dryer, ie a dryer in which a refrigerant dryer is combined with an adsorption dryer. In the dryer described in FIG. 5 of EP 2 263 778 A1, a refrigerant dryer is connected upstream of the adsorption dryer. This is done in such a way that the gas inlet of the adsorption dryer does not suck in a moist gas, but is fed with gas which has already been pre-cooled by the refrigeration dryer and predried. Part of the moisture is thus already eliminated in the refrigerant dryer. This has the advantage that the gas enters the adsorption dryer in a state in which many desiccants have a better absorption capacity than in the case of not

pretreated, ie wet gases. The hybrid dryer shown in FIG. 5 of EP 2 263 778 A1 is therefore distinguished from pure adsorption dryers by an increased efficiency. However, the disadvantage is the higher complexity of the system and the associated costs. In addition, the efficiency of Although described plant higher than pure adsorption dryers, nevertheless can be achieved with the illustrated system no efficiencies that are expected of modern drying plants without Regenerationsgasverlust.

Dryers without regeneration gas loss are also referred to as "zero purge dryers".

The invention is therefore based on the object, the above-described and previously described apparatus for drying gases in such a way and further develop that a higher efficiency is achieved.

In a device according to the preamble of claim 1, this object is achieved by a blower, which with a suction line and a line to

Suction of pre-cooled and pre-dried gas and / or with a

Suction line and a line for sucking dry gas for the

Regeneration is connected.

For dryers with two adsorption chambers, one of the chambers must be supplied with gas for adsorption, while the other chamber must be supplied with gas for the adsorption chamber

Regeneration must be supplied. The regeneration may comprise several steps, in particular the steps "heating up" and "cooling down". Preferably, the adsorption chamber is not heated itself, but by gas, which was heated before flowing into the adsorption chamber, heated. According to the invention, the regeneration gas is sucked by a blower in at least one of the regeneration steps and fed to the corresponding adsorption chamber. This has the advantage that the amount of gas supplied and the pressure resulting therefrom can be controlled much better than if the gas for regeneration, for example without a fan, is led from one adsorption chamber into the other adsorption chamber merely due to a pressure difference (compare line 180 in FIG 5 of EP 2 263 778 AI). In addition, according to the invention pre-cooled and pre-dried gas is sucked through the blower and used for regeneration. Alternatively or additionally dried gas is passed through according to the invention sucked in the blower and used it for regeneration. By pre-cooled gas is meant gas which is colder than the gas flowing into the device.

Pre-cooled gas, however, does not necessarily have to be cooled down to the final temperature. Pre-dried gas is accordingly understood to mean gas that has less moisture than that into the device

incoming gas. However, the pre-dried gas does not necessarily have to be completely dry. The use of precooled and pre-dried gas for regeneration can achieve a higher efficiency than systems in which untreated gas, in particular moist gas (e.g.

Ambient air), used for regeneration. By the lesser

Water entry into the adsorption tank longer cycle times are possible before regeneration must occur. In addition, smaller containers can be used, resulting in lower investment costs. Finally, the heating phases can be shortened, which reduces the operating costs. Preferably, the gas is pre-cooled to a temperature of 5 ° C or less. Particularly advantageously, the claimed device for drying methane, especially of bio-methane, can be used.

An advantage of a dryer according to the invention is that due to the minimal pressure differences in the system, no regeneration gas is lost (so-called "Zero Purge dryers".) The dryers are preferably operated at a slight overpressure Ambient air can lead to a risk of explosion, especially in the case of a methane dryer due to the oxygen contained in the ambient air.

According to one embodiment of the invention it is provided that the fan in

Flow direction is arranged behind the radiator and the condensate outlet. In particular, the fan may be arranged in a bypass. With the

Flow direction is referred to that direction that the gas from the

Gas inlet travels to the gas outlet. By putting the fan behind the radiator and

AC / cj 121378WO October 21, 2013 the condensate outlet is arranged, it is achieved that the sucked gas is pre-cooled by the cooler and is pre-dried by the condensate outlet. The condensate outlet may be equipped with a demister for drying purposes, and the blower may be located immediately after the radiator and the demister

Be arranged condensate outlet or even behind the two

Adsorption chambers may be arranged. Preferably, the suction duct of the blower divides into two ducts, whereby gas can be sucked through the one duct, which is pre-cooled by the radiator and pre-dried by the condensate outlet and whereby gas can be sucked through the other duct and exits from an adsorption chamber and already completely dried.

A further teaching of the invention provides that the device comprises a return line for returning the regeneration gas stream into the line connected to the gas inlet. The regeneration gas, so the gas, which from the

regenerating adsorption chamber, should be returned and upstream upstream be introduced into the main line. Preferably, the introduction takes place in the flow direction behind the prefilter and before the radiator and the condensate outlet. In this way, the energy of the

Regeneration gas stream can be used to promote the entering into the device gas stream.

A further embodiment of the teaching last described provides that the return line at least in the region of the meeting with the line has a smaller cross-sectional area than the line. A reduced

Cross-sectional area has - according to the law of Bernoulli - a higher

Flow rate and a reduced flow pressure in the

Return to the episode. Due to the higher flow rate, the kinetic energy of the regeneration gas flow flowing through the return line is increased. The kinetic energy may be transferred to the gas stream entering the device through the gas inlet to promote it. This operating principle is - as such - known from jet pumps, such as water jet pumps. Of the recycled regeneration gas flow is thus used as a propellant while the entering through the gas inlet into the device gas flow is the suction medium. The advantage of such a conveying mechanism is its simple construction and its robust and low-maintenance operation. In addition, the pressure drop that occurs during the delivery of the gas over the entire system can be reduced.

In a further embodiment of the invention it is provided that the device comprises a pre-filter for cleaning the gas flowing into the device and / or a post-filter for cleaning the gas flowing out of the device.

Through the pre-filter, the incoming gas of dust, sand and more

Impurities are freed. The prefilter is preferably arranged directly behind the gas inlet. The post-filter can purify the already dried gas before leaving the device and, for example, free from residues of the desiccant. The secondary filter is preferably arranged directly in front of the gas outlet.

A further embodiment of the invention provides that the device comprises a second cooler, which is arranged downstream of the fan in the flow direction. If necessary, the cooler can provide cooling of the gas leaving the blower. Additional cooling may be desired or required to lower the exit temperature of the gas or to limit it to a certain limit. In a method according to the preamble of claim 8, the above-described object is achieved in that a fan through a suction line and a line precooled and pre-dried gas and / or by a

Suction line and a line sucked dry gas for regeneration. As has already been described for the device, the invention is based on the knowledge, for the regeneration of the desiccant no gas from the - -

Environment, but to draw in previously dried and previously cooled gas and to pass it into the appropriate adsorption chamber. This is done according to the invention by a fan, the suction line sucks gas from a point at which the gas has already been pre-cooled and pre-dried or already completely dried. The advantages of the suction of pretreated gas by a blower are also in the method according to the invention, inter alia, in a good controllability and in an increased efficiency.

A further embodiment of the method according to the invention provides the following further steps: d) Adsorbing moisture from the gas

Desiccant in the second adsorption chamber; e) heating the gas prior to introduction into the first adsorption chamber; and f) cooling the gas in the first adsorption chamber. These steps correspond to the process steps described above, wherein the functions of the two adsorption chambers are reversed: Steps a] to c) describe an adsorption in the first adsorption chamber and a regeneration in the second adsorption chamber while steps d) to f) describe an adsorption into describe the second adsorption chamber and a regeneration in the first adsorption chamber. Steps a) to c] represent half a cycle; The steps a] to f) accordingly form a full cycle. The implementation of all process steps has the advantage of optimal utilization of both adsorption chambers, since at any time at least one chamber adsorbs moisture.

In a further embodiment of the method it is provided that a heater pre-cooled by the condenser and heated by the condensate outlet gas. This step serves to regenerate the desiccant. By using a heater, a warm regeneration can be performed that is more effective than a cold regeneration. This is particularly due to the fact that warm gas can absorb more moisture than cold gas and therefore warm gas is better suited to extract moisture from the desiccant. A further embodiment of the method provides that the fan directs dry gas from one of the adsorption chambers into the respective other adsorption chamber. This step also serves to regenerate the desiccant. The effluent from the one adsorption chamber gas is completely dried and is therefore even better for the regeneration of the other adsorption chamber as gas, which was only pre-dried. However, since the fully dried gas is at the same time the desired end product of the drying process, preferably only a portion of the completely dried gas is diverted and used to regenerate the other adsorption chamber. By using a blower, the amount of gas supplied can be controlled more accurately than when supplied due to a pressure difference between both adsorption chambers.

A further teaching of the invention provides that a second cooler cools the dry gas leaving one of the adsorption chambers before it is conducted into the respective other adsorption chamber. By the second cooler, the dry, used for the regeneration of the other adsorption gas can be cooled. This may be desired or necessary to lower the exit temperature of the gas and to comply with limits. A further embodiment of the method provides that the from the

Adsorption chamber emerging regeneration gas flow is returned and enters a line connected to a gas inlet line. This conveying mechanism works on the principle of a jet pump and was already in the

Related to the device described. Its advantages are a lower pressure drop across the entire system in the promotion of the gas.

Finally, a further embodiment of the invention provides that at least one temperature sensor measures the temperature of the gas entering and / or leaving the device. By measuring the temperatures, the process can be better controlled. The measurement of the temperature of the incoming gas preferably takes place directly behind the gas inlet; the measurement of the temperature of the exiting gas is preferably carried out directly in front of the gas outlet.

The invention will now be described with reference to a preferred one

Embodiment illustrative drawing described in more detail. The drawing shows an embodiment of a device according to the invention for

Drying of gases, the device of Fig. 1 in carrying out a first step of the method according to the invention for drying gases, the device of Fig. 1 in carrying out a second step of the method according to the invention for drying gases,

4 shows the device of FIG. 1 in the execution of a third step of the method according to the invention for drying gases, FIG. 5 shows the device of FIG. 1 in carrying out a fourth step of the method according to the invention for drying gases;

Fig. 6 shows the apparatus of Fig. 1 in the execution of a fifth step of the method for drying gases and

Fig. 7 shows the device of Fig. 1 in the execution of a sixth step of the method according to the invention for drying gases.

Fig. 1 shows an embodiment of a device 1 according to the invention for drying gases. The device 1 comprises a gas inlet 2 and a gas outlet 3, as well as two adsorption chambers 4, 5. The gas inlet 3 is connected via a line LI a pre-filter 6 and an optional temperature sensor 7 connected. Behind the prefilter 6 and, if present, behind the optional temperature sensor 7 opens a return line L2 in the line LI. The line LI further leads to a condenser 8 and a condensate outlet 9. The condensate outlet 9 comprises a demister for drying: A line L3 branches off the line LI behind the condensate outlet 9. The line LI then divides into the line LI Lines L4 and L5 The line L4 leads via a valve 10 to the lower end of the adsorption chamber 4, while the line L5 via a valve 11 in

corresponding manner leads to the lower end of the adsorption chamber 5.

The aforementioned return line L2 is formed by a confluence of

Lines L6 and L7. The line L6 passes through a valve 12 and ends in the line L4. Correspondingly, the line L7 passes through a valve 13 and ends in the line L5. From the upper end of the adsorption chamber 4, a line L8 passes through a valve 14; Accordingly, a line L9 leads from the top of the adsorption chamber 5 through a valve 15. Behind the valves 14, 15, the lines L8, L9 combine to form a line L10 which is connected to an optional one

Temperature sensor 16 and connected to a likewise optional post-filter 17 and finally leads to the gas outlet 3.

The aforementioned line L3 leads through a valve 18 into a suction line LH. In addition, a line L14 branching off from the line L10 leads through a valve 19 into the suction line LH. The suction line LH is connected to a blower 20, an optional radiator 21 and a heater 22, before entering the

Lines L12 and L13 divides. The line L12 passes through a valve 23 and ends in the line L8 while the line L13 passes through a valve 24 and ends in the line L9. The valves 10, 11, 12, 13 can by a not shown in Fig. 1

Four-way valve to be replaced. In a corresponding manner, the valves 14, 15, 23, 24 can be replaced by a likewise not shown in Fig. 1 four-way valve. All lines LI to L14 Depending on the position of the valves are basically suitable to be flowed through by gases and / or liquids in both directions. All valves can be adjusted continuously between a fully open position and a fully closed position.

Fig. 2 shows the device 1 of Fig. 1 in the execution of a first step of the inventive method for drying gases. In the in Fig. 2

In the situation illustrated, the valves 10, 13, 14, 18 and 24 are at least partially opened while the valves 11, 12, 15, 19 and 23 are closed (solid representation)

Mode of operation of the device 1: Moist gas, in particular moist methane, enters the line LI of the device 1 through the gas inlet 2 and flows through the pre-filter 6, the cooler 8 and the condensate outlet 9. If an optional

Temperature sensor 7 is present, the temperature of the incoming gas is measured by this sensor. Since the valve 10 is opened while the valves 11 and 12 are closed, the now pre-dried and precooled gas continues to flow through the line L4 into the adsorption chamber 4. There, moisture is removed from the moist gas by a hygroscopic desiccant disposed in the adsorption chamber 4 ; this process step is therefore referred to as "adsorption".

After moisture has been removed from the moist gas in the adsorption chamber 4, the gas flows out of the device 1 in a dry state through the line L8 and the line L10 and finally through the gas outlet 3. This is achieved by opening the valve 14 while the valves 15, 19 and 23 are closed. If an optional temperature sensor 16 and an optional post-filter 17 are present, a measurement of the temperature and a cleaning of the effluent, dry gas takes place. While in the adsorption chamber 4 shown on the left in FIG. 2, the "adsorption" takes place, in the adsorption chamber 5 shown on the right in FIG This is done by the following sequence: The blower 20 draws in through the intake line LH a partial flow of the pre-dried, pre-cooled gas, this partial flow being diverted from the line LI carrying the main flow is passed by the blower 20 through an optional radiator 21 and through a heater 22 and is strongly heated in the heater 22. Heating the gas greatly increases its ability to absorb moisture since the valves 15 and 23 are closed while the blower 20 is closed Valve 24 is open, the heated gas is then passed through line L13 into the adsorption chamber 5. In the adsorption chamber 5, the heated gas removes moisture from the desiccant This step is also referred to as "heating" and is part of a desiccant regeneration. Since the absorption capacity of the desiccant is limited, a regeneration phase must follow an adsorption phase before the desiccant can absorb moisture again. After the heated gas has absorbed moisture in the adsorption chamber 5, the moist, warm regeneration gas flows through the line L7 and the return line L2 and flows into the line LI before it enters the cooler 8. This is achieved by closing the valves 11, 12 while the valve 13 is open. Fig. 3 shows the device 1 of Fig. 1 in the execution of a second step of the method according to the invention for drying gases. In the in Fig. 3rd

illustrated situation, the valves 10, 13, 14, 19 and 24 are at least partially open, while the valves 11, 12, 15, 18 and 23 are closed. Because of this adjustment of the valves, the following mode of operation of the device 1 results: The adsorption chamber 4 shown on the left in FIG. 3 flows through in the same way as was described in connection with FIG. 2. The process step "adsorption" thus still takes place in the adsorption chamber 4. By contrast, the mode of operation of the process shown in FIG

Adsorption chamber 5 with respect to the situation shown in Fig. 2 changed. The fan 20 sucks through the suction line LH no pre-dried, pre-cooled gas through valve 18 and the line L3; it sucks completely dry instead Gas through the valve 19 and the line L14. In this case, the sucked air is not heated. The dry gas is a partial stream which is branched off from the main flow lines L8, L10. The illustrated in Fig. 3, in the

Adsorption chamber 5 taking place process step is referred to as "cooling" and is also a partial step of a regeneration.

Fig. 4 shows the device 1 of Fig. 1 in the execution of a third step of the method according to the invention for drying gases. In the in Fig. 4

illustrated situation, only the valves 10 and 14 are at least partially open, while all other valves are closed. Because of this adjustment of the valves, the following mode of operation of the device 1 results: The adsorption chamber 4 shown on the left in FIG. 4 flows through in the same way as was described in connection with FIGS. 2 and 3. In the

The adsorption chamber 5 shown on the right on the right is thus shut off and not flowed through This is achieved by closing the valves 11, 13, 15 and 24. The adsorption chamber 5 is in the situation shown in Fig. 4 thus at rest, which is also referred to as "stand by" and can also be regarded as a partial step of a regeneration.

Fig. 5 shows the device of Fig. 1 in the execution of a fourth step of the method according to the invention for drying gases. In the in Fig. 5th

illustrated situation, the valves 11, 12, 15, 18 and 23 are at least partially open, while the valves 10, 13, 14, 19 and 24 are closed. In this way, a situation arises which is symmetrical to the situation described in FIG. 2, wherein the functions of the two adsorption chambers 4, 5 have been reversed. In other words, in the adsorption chamber 4, the process step

"Heating" takes place while in the adsorption chamber 5, the process step "adsorption" takes place. Fig. 6 shows the device of Fig. 1 in the execution of a fifth step of the method according to the invention for drying gases. In the in Fig. 6

illustrated situation, the valves 11, 12, 15, 19 and 23 are at least partially open, while the valves 10, 13, 14, 18 and 24 are closed. In this way, there is a situation that is symmetrical to the situation described in Fig. 3, wherein the functions of the two adsorption chambers 4, 5 were reversed. In other words, the process step "cooling" takes place in the adsorption chamber 4, while in the adsorption chamber 5 the process step "adsorption" takes place.

Fig. 7 shows the device of Fig. 1 in the execution of a fifth step of the inventive method for drying gases. In the in Fig. 7

illustrated situation, the valves 11 and 15 are at least partially open, while all other valves are closed. In this way, a situation arises which is symmetrical to the situation described in FIG. 4, wherein the functions of the two adsorption chambers 4, 5 have been reversed. In other words, the process step "stand by" takes place in the adsorption chamber 4, while in the adsorption chamber 5 the process step "adsorption" takes place. The method steps illustrated in FIGS. 2 to 7 overall form a cyclical method, so that the sixth one shown in FIG

Step again the illustrated in Fig. 2, the first step follows.

Claims

Patent claims

1. Apparatus for drying gases, in particular for drying methane, comprising:

a gas inlet (2),

a gas outlet (3),

- At least two adsorption chambers (4, 5) for receiving

Desiccant,

a cooler (8) arranged in the flow direction between the gas inlet (2) and the adsorption chambers (4, 5),

- A condensate outlet (9), in the flow direction between the

Gas inlet [2] and the adsorption chambers (4, 5) is arranged, and

a heater (22),

the adsorption chambers (4, 5) being connected to the gas inlet (2) and to the gas outlet (3),

marked by

a blower (20) connected to a suction pipe (LH) and a pipe (L3) for sucking pre-cooled and pre-dried gas and / or a suction pipe (LH) and a dry gas sucking pipe (L14) for regeneration is.

2. Apparatus according to claim 1,

characterized in that

the fan (20) in the flow direction behind the radiator (8) and the

Condensate outlet (9) is arranged

3. Apparatus according to claim 1 or 2,

characterized in that the device (1) has a return line (L2) for returning the

Regeneration gas stream in the gas inlet (2) connected to the line (LI) comprises.

Device according to claim 3,

characterized in that

the return line (L2) has a smaller cross-sectional area than the line (LI) at least in the region of the contact with the line (LI).

Device according to one of claims 1 to 4,

characterized in that

the device (1) comprises a pre-filter (6) for cleaning the gas flowing into the device (1).

Device according to one of claims 1 to 5,

characterized in that

the device (1) comprises a post-filter (17) for cleaning the gas flowing out of the device (1).

Device according to one of claims 1 to 6,

characterized in that

the device (1) comprises a second cooler (21) which is arranged downstream of the blower (20) in the flow direction.

Process for drying gases, in particular for drying methane, with a device according to one of Claims 1 to 7, comprising the following steps:

a) adsorbing moisture from the gas by desiccant in a first adsorption chamber (4);

b) heating the gas prior to introduction into the second adsorption chamber (5); and c) cooling the gas in the second adsorption chamber (5), characterized in that

a blower (20) draws pre-cooled and pre-dried gas through a suction line (LH) and a line (L3) and / or through a suction line (LH) and a line (L14) for regeneration.

9. The method according to claim 8, further comprising the following steps:

d) adsorbing moisture from the gas by desiccant in the second adsorption chamber (5);

e) heating the gas prior to introduction into the first adsorption chamber (4); f) cooling the gas in the first adsorption chamber (4).

10. The method according to claim 8 or 9,

characterized in that

a heater (22) through a cooler (8) pre-cooled and through a

Condensate outlet (9) preheated gas heated.

11. The method according to any one of claims 8 to 10,

characterized in that

the blower (20) directs dry gas from one of the adsorption chambers (4, 5) into the respective other adsorption chamber (4, 5).

12. The method according to claim 11,

characterized in that

a second cooler (21) which cools one of the adsorption chambers (4, 5) exiting dry gas before it in the other

Adsorption chamber (4, 5) is passed.

13. The method according to any one of claims 8 to 12,

characterized in that the regeneration gas stream leaving the adsorption chamber (4, 5) is returned and enters a line (LI) connected to a gas inlet (2). 14. The method according to any one of claims 8 to 13,

characterized in that

at least one temperature sensor (7, 16) measures the temperature of the gas entering and / or leaving the device (1).