DE2038289A1 - Method and device for drying webs of material - Google Patents

Description

DIPL. -PHYS. F. FINALLY sos * unterpfaffenhofen 3o. July 197o

FLOWER STREET 5

PATENT ADVOCATE E / G

TELEPHONE: (MUNICH) 84 36 38

TELEGRAM ADDRESS; PATENDLY MUNICH

CABLE ADDRESS: PATENDLY MUNICH

2038289 My file: D-2663

Applicant: DOMINION ENGINEERING WORKS, LIMITED Toronto Ontario, Ganada

Method and device for drying webs of material.

The invention relates to a method and a device for drying webs of material with the aid of a gas turbine, in particular for drying paper webs.

The use of gas turbines to dry paper webs has already been proposed. This proposal has worked however, it has not yet been shown to be generally feasible because of a number of difficulties which arise the mode of operation of gas turbines can be traced back to. Certain Properties of gas turbines are namely in this context disadvantageous and do not allow high efficiency of the The energy supplied to the gas turbine when drying paper webs o. the like. webs of material.

It is therefore the object of the invention to enable the use of gas turbines while avoiding the existing difficulties.

This object is in a method for drying Paper webs or other material webs with a gas turbine Invention according to the fact that preheated air in a

109809/1428

Gas turbine kompri.mie.rt is to use compressed air as mechanical To supply input energy sound generators or similar devices to a drying section, the thermal input energy to a subsequent drying section directly or through heat exchange from the exhaust gases of the turbine is delivered / and wherein at least one section has a Removal of moisture is carried out by an impinging jet of air.

The invention utilizes the function of a gas turbine in a more efficient manner. The effective use of a gas turbine depends on the selection of compatible drying systems when performing a drying process. Choosing one suitable drying system or a combination of such Systems, including the selection of new drying processes, depends on the effective efficiency of such systems, which is determined by the amount of heat required per unit weight of water removed .. Method for determining such Values are known.

When comparing the energy requirements, it can be determined that in a new process in which in the main no evaporation occurs, 28ok.cal. per kg of water are required, while twice as much in an evaporation process or four times the amount of energy is required. When choosing a combination of processes, for example sonic drying and air-jet drying, the whole can be combined specific energy requirements for these two processes are supplied by compressed air and the exhaust gas, a gas turbine. In this way, sufficiently compressed air can be discharged from the outlet of a gas turbine at a significantly reduced specific rate Input energy "- measured in kocal» per kg compressed air, in contrast to an electrically driven one separate compressor »through-.integration of the requirements with regard to the compressed air .both for the gas turbine as well as for the Schallfesödsnuag.in.einer © intimate machine, an advantage can be achieved with regard to the Masd * ± nengr8 £ e.-er.

109809/1428

2Ü38289

Such an arrangement allows about half of the total drying in the drying section by sonic drying is performed. The rest of the drying can then be carried out by a conventional thermal process, in which a higher specific energy requirement is required / which is supplied from the output of the machine in order to to achieve good efficiency. The selection of suitable ■ liquid or gaseous fuels and / or the use Effective use of hot gases, for example through gas filters / is also required.

A sonic drying enables a relocation of the Moisture in the web surface or surfaces, while moisture is normally in by a jet of air caused primarily by evaporation from the web surface, so that a suitable combination occurs when successive Application results if the procedures in question at the Areas of moisture for which they are best suited.

With the already proposed use of sonic drying (Patent application P 2o 33 427.1) a supply of heat in addition to the supply of compressed air is usually required to achieve the following:

a) An increase in the temperature of the compressed air.

which is fed to the sound generators by preheating at the inlet of the compressor, or optionally a new one Heating the air exiting the compressor, which is less economical, however; and

b) An increase in the temperature of the secondary air, which was circulated in the resonance zone or circulated again is used to control the humidity conditions, taking the additional heat input from the outlet of the Gas turbine can be obtained directly or through the use of heat exchangers.

109809/1428.

2Ü38289

When assessing the efficiency of a compressor for a device for sonic drying must be taken into account that normally undesirable losses -due to internal losses in the compressor as a beneficial increase the temperature of the air exiting the sound generators. This is true for both gas turbine compressors also applies to compressors that are driven by an electric motor and avoids the use of a compressor intercooler. In the case of a gas turbine with a built-in compressor with two coils, an advantageous use can be made this property take place.

In the case of an external mechanical drive of a compressor, for example sv / ei se in the form of an electric motor, the mechanical and electrical energy losses from the motor are destroyed but not as usable thermal energy in the exiting air, therefore, it is preferable to use a direct drive of a gas turbine as the primary device, with such losses are practically avoided.

Using part of the total drying process as an evaporation process enables the whole to be balanced Output of the gas turbine in order to achieve a suitable heat balance. Therefore allows the use of the mechanical Output energy of the turbine to generate cheap electrical power the economical use of microwave drying, which would otherwise be too uneconomical if commercially generated power is used. This is significant, for example in the case of moisture distribution in the case of coated webs, where the properties of microwave drying are effectively used can find, despite the high cost of electrical power, usually because of the cost factor of using conventional energy sources cannot be used.

Therefore, a combined drying process results in significant cost savings using a gas turbine finds, on the one hand, gas for a sonic drying and a

109809/1428

2Ü38289

Air-jet drying emits, and the other hand electrical Energy, for example a moisture distribution through Microwave supplies, in which two cases a combination takes place with a heat drying, for which the thermal output energy the turbine is used, compared to a corresponding system in which commercial electrical Energy, gas heating and compression, with common facilities is used.

Regarding the efficiency of the compressor go Considerable advantages with regard to the practically complete energy utilization of the compressor losses for sonic drying, because the compressor can be provided without a double jacket or any other cooling device, which results in further cost savings when selecting the compressor or the associated components.

The use of a process gas turbine of the type described serves to explain the significance of the efficiency of the relevant Components of the gas turbine, so that the plant costs accordingly can be reduced. The pressure load and the thermal load on the machine components are also reduced, which also means certain savings.

In the method according to the invention, therefore, both the mechanical and the thermal energy output of a gas turbine is used for drying, whereby the lack of the optimal efficiency of the components during compression or expansion only changes the proportion or proportion that is between the usable thermal Energy output and the usable mechanical energy output is achieved. By using a gas turbine,. takes place in the not optimal expansion, the cost of the turbine can be considerably reduced while using the machine is favored pressure as a generator for hot gas by the higher output ■ to the hot exhaust gases to promote the components of the drying device. Of the many different features of the design, which have good efficiency and

109809/1428

2Ü38289

The shape of the blading enables costs to be saved and their tolerance limits, such as the external clearance, typical of the area in which an increase in tolerances and margins results in significant cost savings in a allow acceptable loss of efficiency =

Although there are a number of ways that are mechanical To use the output energy generated by the machine, the following possibilities, which are not in themselves new, can be used

1. A sound generator, such as jet whistles, is actuated with the compressed gas to remove moisture from the web to remove, as shown in the earlier patent mentioned ο

2. The generation of electrical power to drive components of the paper machine and / or the drying section and / or for dielectric drying or drying by microwaves »

While an older proposal for eliminating the existing difficulties included the use of compressor air as a Air jet is proposed for drying a web, can according to the invention due to the large operating pressure range of Sound generators find compressed air from the compressor use to drive sound generators of the type mentioned, while in addition a recovery of heat both from the compressor air and from the exhaust gases of the turbine can be used can, a sonic drying, as well as an air jet drying against perform the surfaces or through the web, being a Heat exchange with the steam generators, for the delivery of Process steam takes place in the paper mill, or v / whether it is usual steam-heated drying cylinders are used =

Though it is normally-not practical * exhaust one Use turbine for nozzle pipes see below * because the pipes through Solids rad contaminants of the exhaust gases, can be damaged can * but their use is still possible * if gas filters are provided for the removal of such parts »

2Ü38289

When using exhaust gases from a turbine for direct drying of a web, the use does not become more costly polluting fuels / such as natural gas or kerosene by the Use mechanical filters to offset the exhaust gases. Optionally, the use of heat exchangers may be necessary / to allow indirect air heating, which creates a corresponding cost increase results. Chemical treatment of the fuel is suggested as one way of improving it the properties of the products of combustion to reduce the impurities.

When direct use of exhaust gas for air jet drying if desired, replaceable ceramic filter cartridges can be used. Such a filtration of hot gas behind the combustion chamber, but before entering the expansion turbine, the energy loss is kept to a minimum held because the air velocities are thereby reduced while secondary air is bypassed the filter can to reduce the losses over this and the required filter capacity as small as possible. keep. This arrangement results the added benefit of running the expansion turbine on clean gas, which means less maintenance is required are. The temperature gradient across the filter can be compensated for by higher combustion temperatures to achieve the desired Temperature is present at the turbine inlet.

By reducing the expansion ratio of the turbine, to get a starting value of 3.5 to 5 units (psig) compared to a more common value of 2 units, the Use of additional gas blowers for high flow rates at low pressure in the drying section, resulting in considerable savings while wasting in connection with the mechanical efficiency as useful heat energy of the exhaust gas occurs: that for the recovery of Heat used in the process or for indirect drying can be.

1 0980 9 / U28.

With regard to the proposed exemplary embodiments for through-flow drying, it is noted / that the air from the Compressor at a pressure of several atmospheres is used for this purpose. This solution has the disadvantage / that Heavy housings have to be provided * which have to withstand the considerable forces that occur, e.g. through the Flow from the interior of the drum caused forces, while avoiding such large shear forces on the web as well brings certain difficulties. Air losses at the hood seals and at the web edges are also important. From this it can be seen / that high pressure systems are not practically suitable / while the invention is a preferred combination of processes with a thermal compensation made possible.

By supplying relatively strongly compressed gas to a sound generator, which is designed like a nozzle whistle, is In addition to a mechanical displacement of the moisture content in the strip, the overpressure in the acoustic hood is almost at atmospheric pressure decreased, because of the pressure gradient in the circles, whereby acceptable limits in terms of design and costs can be adhered to. The distance of the hood. From the web when the web is inserted must be, is an important factor in connection with the pressure diffusion and the resulting reduction in Mass of the hood. The use of a compressor with a medium efficiency will pre-weigh what air in a Pressures between 1.05 - 2.8 kg per square cm (15 ™ 40 psig) on the sound generators supplies. The use of a heat exchanger or an air circulator to increase the air temperature at the compressor inlet from the ambient temperature to about 27 - 60 ° C an effective sound generation in the pipes and a hotter jet of air, which is directed from the exit of the pipes onto the track will. The entrance temperature for the pipes is between approx 138 and 2o5 C, the compression heating being used, if necessary with additional heating or with a hot air supply to achieve the desired air temperature.

109809 / U28

The invention will be explained in more detail using the exemplary embodiments shown in the drawing. Show it:

1 shows a schematic representation of a drying device with a gas turbine, according to a first exemplary embodiment;

2 shows a corresponding illustration of a second exemplary embodiment; and

3 shows a gas filter arrangement according to the invention.

The gas turbine Io in Fig. 1 includes a compressor section 12, a turbine section 16 and mechanically connected thereto a combustion chamber 14. An electric generator 24 or a motor generator is also driven by the turbine 16, which with the machine is connected via a coupling and, if desired, the additional function of a starter motor or a power generator exercises.

As external connection connections of the gas turbine Io are one Air outlet line 2o from a first section 17 of the compressor 12, as well as a gas outlet line 22 from the turbine section 16 provided.

In the embodiment «in FIG. 1, mechanical Energy in the form of compressed air from the compressor section 17 via line 2ο the sonic drying section 3o, fed, which is a drum type sonic dryer, which is described in more detail in said earlier patent. The thermal Energy from the output line 22 becomes an air jet dryer 4o forwarded in a known manner.

In the following, the air supply will first be discussed in more detail. The use of a "Vorerh-itzers 19 au δστ> * SiaXa £ 21 of the compressor raises the temperature .the ueen Pf n * £ <m rebuke. '^ A. tea air. The air line 2o is connected to the H * '' heoihife! Rr * I ¹ <? Q3 sound drying section 3 ©. D-ii. ν. » , ν. : iCa / »iv" ** ^ * "

109809 / uai

- Io -

via the line 32 to the air distributors 33. A number of · Manifolds 33 / full of which two are shown extend across a drum 35 from which the web 36 to be dried will be carried. A number of sound generators 37, for example Nozzle pipes of the type mentioned are arranged along each manifold so that this is heated and clean air can be supplied.

Each manifold 33 supplies a trough-shaped reflector 38 which extends along the width of the drum 35. A secondary jet of low pressure air from the reheater is passed through line 41 from manifolds 42 located adjacent respective reflectors 38 which co-extend therewith across the web to the remote drying web. An air jet or curtain is created by the manifolds 42 from the outlet nozzles 142 with inclined slits, which air sweeps over the surface of the moving web to remove moisture. The gas mixture supplied to the reheater 31 comes indirectly from the outlet line 22, as follows The nozzle 142 causes a gas movement in the reflectors 38 _D, with gas emerging from the edge of the reflector in question in the direction opposite to the web movement, which promotes drying in border areas on the surface of the web.

The drying section Ao contains a cylinder 45 which is not perforated and which extends over the web. 3β runs "The Ver = turn a perforated Eyliaäers also IS Possible _s xm a Durclitrittstrockaiang known type su allow"

The Luftstrs ^ i = TrQe! Satiafsaiari.ehtmig 4d has a cap a in 0 »ifangsrielitmef vexlsmf @ Nä® partition wall 47 in a CIa ¹ TOB, in a H © igl« fti ^? © st © il © r <SS im b © gic @ asea _? © in © perforated Tsrnwu-maä ^ l \ tfsldä © with ü®t Tistsmmsmä 41. @! A © n

ϊ? ο3, @ ίί \ Θ UXq ü

- ■ li - ■■■■ '■

The hot gas mixture from line 22 of the turbine section 16 passes through exchangeable filters 55 to rows of gas injectors 56 of a type known per se, each of which has one Has venturi section 57. The hot gas creates a negative pressure in the inlet openings 59 / 6o of the injectors, which serve to supply fresh air or for recirculation, the Flow is controlled by throttling devices, not shown, to produce a mixture that blends with the exhaust gas is used to lower the air temperature and create suitable psychrometric drying conditions. A part of Mixture reaches the high pressure distributor 49 via line 61, the pressure of which is controlled by a throttle element 63 in line 61 will. Another part of this gas mixture arrives from the injector 56 via the line 65 to the heat exchanger 67 and then to the reheater 31 of the sonic dryer 3o. The gas mixture from the line 65 is cooled in the heat exchanger 67 and in the reheater 31 and then passes through the line 41 to the sonic dryer, so that a suitable moisture content for air jet drying is available.

The heat exchanger 67 receives fresh air via the inlet 71, which is sucked in via the injector 56 to which the heat exchanger 67 is connected via a line. 73 is connected.

The moist exhaust air from the distributor 48 of the dryer 4o reaches the inlet 6o of the injector 56 via the line 75.

The exhaust air of the sonic dryer 3o, which along the track flows in an opposite web direction, is removed from the relevant gap 35, if desired To enable heat utilization in another part of the entire drying facility.

Because of the gentler drying and the higher throughput of sonic dryers in removing moisture from very wet tracks and because of the different properties of the

109809/1428

Air drier beam 4o, which is better suited for less wet webs is generally provided 'that the web 36 is first passed through the sound dryer 3o and then ^ the air jet dryer. The use of steam heating of the drum 45 is not intended specifically here, although steam heating can optionally be carried out using the heat of the exhaust gas from the turbine, as will be explained in more detail later. Although the compressor 16 has successive low pressure and high pressure sections, two separate compressor sections can also be used which are driven by a common shaft to allow improved flow control of the compressor of the power turbine and more flexible utilization in drying.

In the embodiment of the invention shown in Fig. 2, the gas turbine Io is via the coupling 11 with the Generator 24 connected »The preheater not shown here can be used, or instead a mixing arrangement for recirculated hot air to allow temperature compensation according to the ambient temperature =

In this embodiment there is a drying section provided with a conventional steam-heated drum, the drums 133 via the manifold 131 "from the, steam boiler 132 steam is fed. The steam boiler 132 is heated by burner 135, with exhaust gas from the turbine being fed in via line 122, to encourage combustion and add heat through the hot incoming gas. Because of the excess air in the exhaust gas the turbine after combustion, steam generation can be favored. The one from the steam boiler through a The gas stream exiting filter 137 reaches a number of injectors 156, through whose outlet 161 the air jet dryer is supplied to dry the web from two sides. Only the connections to the top of the dryer I4o are shown, while the connections below are omitted for the sake of clarity. The through outlet 163 of the Gas stream exiting from dryer 140 is partly used as mixed gas

109809 / U28

2Q38289

returned to injectors 156. A throttled air supply line 178 enables certain amounts of air to enter the injector 156. A portion of the gas flow emerging from the injector is fed to an exhaust gas preheater 175 via line 17o, to heat incoming fresh air. A spray injector can also be used be provided for the supply of hot water, as well as a further cooling of this exhaust gas.

The branch line 177 with one provided therein Throttle element can supply gas for air-jet drying / for example to a dryer 45 in FIG. 1. Since the air circulation in this case without the aid of the injector 156 for removal the humid air is carried out from the dryer section, not shown, the operating pressure in the line 177 kept sufficiently above atmospheric pressure so that the necessary circulation takes place.

A special feature of the invention can be seen in the fact that the outlet pressure of the gas turbine is kept at a sufficient value so that the use of auxiliary fans to circulate the drying air is practically unnecessary. the Reduction in efficiency due to this higher pressure and the correspondingly higher temperature is recovered in operating costs and capital costs, while the Drying processes with the resulting higher gas temperatures can be performed, thereby recovering the loss of thermal energy caused by the reduced expansion ratio of the turbine section results.

In addition, electrical energy can be conducted from the generator 24 to microwave generators 198, only one of which is shown, in order to supply a dryer 2oo which has opposite microwave transmitters 2o2. Flexibility and the balanced drying that is made possible by a gas turbine and combined processes, whereby an appropriate drying is made possible, «insbsi.'jonö-are to remove wet streaks, what. in particular! at gescMcfetataii

■■■ ■ '■ ■ - - 109803 / UJU? ■ '■'. '- -

Rails (for example with increased surface moisture) is advantageous, but this usually causes too high costs in the case of a conventional energy supply. Due to the extensive Exploitation of the internal losses of the system, in which the losses of the compressor and the turbine are largely responsible for the process can be recovered, and because of the effective utilization of the turbine components because of the lower Expansion ratio to achieve effective air circulation through the drying section is used in this process A high overall thermal utilization of the fuel is achieved.

Fig. 3 shows a device for the filtration of hot circulated gas.

In this embodiment, the combustion chamber is 314 arranged behind the compressor 21o, while the expansion turbine 316 is provided with a filter 329, which a number of replaceable plates or cartridges.

The combustion chamber 214 is supplied with compressed air through a line 318. The primary air enters the through line 32o Flame tube boiler 315. Air reaches the outside of the flame tube boiler via the branch line 322 via the throttle device 322 315 to allow heat dissipation. Some of this air can enter the fire tube boiler 315 in a manner known per se enter as secondary combustion air to cool the pipe walls.

The hot exhaust gases pass through line 327 to the Filter 329. The gas exiting therefrom is mixed with the heated gas from line 325 and then passes through line 33c into the expansion turbine 316.

A suitable construction of the filter (s) 329 ,, in which a number of one of its filters in parallel. arrangement can be provided, such maintenance can be done on the filter successful that they are continuously usable, la become sintered ceramic filter with © iseai atisrdicbsaden cross-section «ad -

2038283

a suitable porosity selected to the desired To achieve filtration of the exhaust gas and an acceptable pressure drop between the compressor 31o and the expansion turbine 316 to train.

It is also expedient to subject the fuel to a chemical pretreatment in order to prevent the formation of impurities to reduce the combustion gas. Also the use automatic, temperature-sensitive control devices for the throttle member 323 is appropriate.

Modified embodiments are also possible, because, for example, the electrical energy is used in dielectric heating devices and / or to drive components can find, the advantages of the invention can be achieved by a different air circulation and a different goods: how to replace them.

However, the exemplary embodiments show the flexibility with which the mechanical and thermal heat dissipation of the gas turbine can be combined for drying webs.

Furthermore, steam can not only be used by the method Heating the drums can be generated, but also for others Purposes for which the steam can be used, that in the heat exchangers generated or heated by exhaust gases.

From Fig. 2 it can also be seen that the replacement of a Suction roll for the drying cylinder, together with a suitable extraction pump for the interior of the cylinder, to produce a suitable Achieving a pressure gradient of a few centimeters of mercury along the thickness of the web enables effective continuous drying.

With regard to the economics of using a Gas turbine with a slightly higher outlet pressure than usual, the costs are reduced in addition to savings for the turbine, that by increasing the temperature of the exhaust gas and the pressure

Λ 09809 / U28 '

2Ü3U289

in certain cases no additional fan is required. Furthermore, this reduces the size of the heat exchangers that are required to generate steam from the exhaust gas. A thermal utilization of the fuel of around 70 to 80 % appears possible, while, on the other hand, a lower efficiency of the gas turbine reduces maintenance costs.

For example, when a suction roll is partially evacuated for complete drying, turbine exhaust gases can occur Find use in injectors of the type shown, which are connected to the interior of the rollers, which application is particularly advantageous for webs of high permeability.

W _e nn paper quality is a direct action on the track surface with exhaust gases bans, can either heat exchanger or exhaust filters are used.

In addition to the higher economic efficiency with regard to the generation of mechanical, electrical thermal energy, the Invention particularly advantageous in terms of the flexibility to achieve rapid drying, including the Possibility of controlling the drying of wet strips through a suitable combination of drying processes.

In addition to using the electrical energy generated by the gas turbine for dielectric heating, can microwave heating can also be carried out, in which case in a suitable Medium in the web heat is generated.

The achievable overall efficiency of the process depends on the full utilization of the energy supplied by the machine in two ways. By selecting a lower efficiency of the turbine with a lower expansion, for example of about 18 %, the mechanical energy output for the combined drying process is limited when it is used as in the exemplary embodiments described. Because of the special properties of sonic drying, half of the drying can still be achieved with such an excitation

109809 / U28

2U38289

be carried out, which is possible with a relatively low energy requirement. The thermal load part of the drying process can then absorb approximately the corresponding thermal energy share of, for example, 70% of the total input energy, assuming 12% unavoidable losses in the system.

- patent claims -

109809/1428

Claims (10)

PATENT CLAIMS 11.) Method using tin drying a sheet of material a gas turbine, characterized in that with the mechanical energy released by the turbine at least one drying stage of the process. Energy is supplied, and that the thermal energy given off by the turbine for supply a further drying stage of the process is used. 2. The method according to claim 1, characterized in that it is shown e t that at least part of the mechanical energy released by the turbine is withdrawn in the form of pressurized gas to operate a sound generator, which is used to move liquid in the material web. 3. The method according to claim 2, characterized I ze net that the compressed gas is withdrawn from the compressor of the turbine -will. 4. The method according to claim 2 or 3, characterized in that an electric generator from the turbine is driven to generate electrical energy for the drying process. 5. The method according to claim 1, characterized in that the expansion ratio of the turbine is chosen so that the pressure at the exit of the turbine is sufficient for gas delivery for the drying process. 6. The method according to claim 5 / characterized by I net that a sound generator is created by the pressure at the exit of the turbine wircL actuates to carry out a drying process 7. The method according to claim 1, 3 or 5, characterized in that the TheiiSe exhaust gas before use see below Is filtered for drying purposes Z.Ü38289 8. The method according to claim I ₇ 3 or 5, characterized ge ken η is characterized in that the hot exhaust gas is filtered before being used for drying, and that the filtration takes place before the supply of the gases into the expansion stage of the turbine. 9. The method according to claim, characterized in that g e k e η η ze i c h η e t that the partially compressed exhaust gas is used for air jet drying. 10. The method according to claim 6 or 8, characterized geke η η - A ζ ei chne t that the temperature of the partially compressed exhaust gas is reduced by air supply. 11. The method according to claim 5, characterized in that the partially compressed exhaust gas for Heating - the air causing the drying is used. 12. Drying device for performing the method according to claim I ₁ geke η ηζ eich η et by a gas turbine with a compressor and a combustion chamber, by a .Fleiteinrichtung for a material web to be dried, by a first drying device, which is operated by the gas turbine with mechanical energy is, and through a second drying device, ^ m which is actuated by thermal energy from the gas turbine and is arranged behind the first drying device in order to utilize a major part of the total energy supplied to the turbine for drying. 13. Drying device for performing the method according to claim 1, gek e η η ζ e i ch η et by a gas turbine, their energy output in a mechanical and a thermal Proportion is divided, in combination with two or more drying devices to utilize mechanical or thermal energy, the ratio of mechanical to thermal energy being the Energy output of the turbine practically equal to the ratio of mechanical to thermal energy output of the combined drying device is. 109809/1428 ' - 2ο - 14. Drying device for performing the method according to claim 1, characterized by a gas turbine, a preheater to increase the temperature of the air entering the compressor, but not a duct to the exhaust burned air from the compressor, through a sonic dryer, to which the extracted air is fed to keep moisture in the To displace the web of material, through an air jet dryer, through a device for forwarding exhaust gas to the turbine this air jet dryer, and through a heat exchanger to control the psychometric state of the material web impinging gas jet. 15. Device according to claim 14, characterized by a device for generating a gas flow to the Material web. 16. Device according to claim 12, IS or 14, g e k e η η ζ ei c h η e t by an electric generator that is driven by the turbine and a drying device with energy provided. 17. Device according to claim 12 or 13, characterized through a filter for hot gas to remove the combustion gases to filter before using them for drying ο 18 device according to claim 12, characterized through a gas filter between the combustion chamber and the turbine to remove contaminants with a predetermined particle size from the remove hot gas before the gas enters the turbine. 19. Device according to claim 18, characterized in that I mark net that the filter device has several ceramic filter cartridges which are arranged parallel to one another, so that an exchange of the cartridges can be carried out without interrupting operation. 10 9 8 0 9 / 14-28 L e r s e i t e