WO2009030382A1

WO2009030382A1 - Method and device for the cleaning of exhaust gas

Info

Publication number: WO2009030382A1
Application number: PCT/EP2008/006938
Authority: WO
Inventors: Carsten Lund Jensen; Johan Kalthoft; Martin LAMBERT SØRENSEN; Peter Skjoldager
Original assignee: Man Diesel Filial Af Man Diesel Se, Tyskland; MYSSEN HØEGH, Martin
Priority date: 2007-08-30
Filing date: 2008-08-23
Publication date: 2009-03-12
Also published as: DE102007040934A1

Abstract

The invention proposes a method and a device for the cleaning of engine exhaust gas. Here, good results are obtained in that the exhaust gas which is to be cleaned is firstly placed in contact with droplets, which are finely vaporized by means of spray nozzles (10), of a cleaning liquid, in that the volume flow of exhaust gas and injected cleaning liquid which is formed in this way is subsequently introduced into the lower compartment (19), which is provided with cleaning liquid, of a trough which is divided by an intermediate base (18) which is formed as a retarding element which is gas- and liquid-permeable, and from here, said volume flow is bubbled through cleaning liquid which is likewise provided in the upper compartment (20) of the trough (12), and in that the exhaust gas which rises out of the cleaning liquid provided in the upper compartment (20) is freed, by means of a change in direction, from any entrained droplets of cleaning liquid, and is preferably subsequently heated. The solid impurities which are entrained by the exhaust gas and the gases which can be washed out are collected by the droplets of the injected cleaning liquid, which droplets are subsequently absorbed by the cleaning liquid which is contained in the compartments (19, 20) of the trough (12).

Description

Process and apparatus for purifying exhaust gas

The invention relates to a method and a device for purifying exhaust gas for at least one large engine, in particular two-stroke large diesel engine.

From EP 1 230 969 A1 a method and a device for purifying exhaust gas in a vehicle engine are known. In this case, the exhaust gas to be cleaned is introduced by means of a perforated tube without pretreatment in an oil bath, above which a perforated cover is arranged as a splash guard. The rising from the oil exhaust gas is then filtered, dehydrated by oil separation and then filtered again several times. This results in the oil bath comparatively large gas bubbles, which come into contact only on their surface with the oil. The oil bath has therefore only a small cleaning effect. There is therefore a risk that the exhaust gas rising from the oil bath still contains many of its original impurities. This is apparently also the reason for the large number of filter stages downstream of the oil bath. The known solution thus proves to be not easy and reliable enough.

On this basis, it is therefore an object of the present invention to provide a method of the aforementioned type, which ensures a high degree of purification. A further object of the present invention is to provide an apparatus for carrying out the method according to the invention, which is simple in construction and enables the achievement of optimum process results.

The object relating to the method is solved by the features of claim 1.

This provides a method of purifying exhaust gas in a large engine, in particular, two-stroke large diesel engine, in proposal, wherein the exhaust gas to be cleaned first flows through a spray zone and contacted there with a cleaning liquid, in which case the spray treatment zone leaving the volume flow of exhaust gas and sprayed cleaning liquid is passed through a cleaning liquid bath wherein the rising from the cleaning liquid exhaust gas Making a change of direction

The fine droplets of cleaning liquid sprayed and atomized into the spraying zone capture and bind the solid particles contained in the exhaust gas and the gases which can be leached out of the exhaust gas. In the subsequent passage through absorbed, wherein the recorded particles and leached gases are transferred to the cleaning liquid and discharged from it. For this purpose, the container receiving the cleaning fluid receives permanent supply of liquid from the spray zone, resulting in a permanent renewal of the contents of the container and a reliable discharge of the impurities absorbed. The measures according to the invention can therefore expect a high degree of purification.

An advantageous embodiment of the method according to the invention can consist in that the spray treatment zone leaving exhaust gas and droplets of the cleaning liquid is introduced into a cleaning liquid provided below a gas- and liquid-permeable damming element and from there spills out a cleaning liquid present above the damming element. These measures lead to a two-stage cleaning liquid bath, so that together with the treatment in the spray treatment zone results in a three-stage treatment of the exhaust gas with cleaning liquid. Below the damming element, most droplets loaded with impurities are already absorbed. In the bubble bath forming above the damming element, possibly remaining residual impurities are removed from the exhaust gas. As a result, particularly good process results can be achieved. In a further development of the parent method may find useful as cleaning liquid water. It is an almost everywhere available cost-effective means that can reliably absorb the solid particles and leachable gases contained in the exhaust gas.

The object relating to the device is solved by the features of claim 8.

Thereby comes a device for purifying exhaust gas in a large engine, in particular two-stroke large diesel engine in proposal, which has a pressure vessel which has an exhaust gas inlet and an exhaust outlet and is provided with at least one communicating with the exhaust gas inlet manifold from which an arrangement with one or a plurality of, in each case a partial flow associated branch nozzle going down, each of which is associated with at least one spray nozzle for spraying a cleaning liquid and each projecting into at least one associated, upwardly open pan, the open lower ends of the branch pipe each associated with a flow deflection effecting valve body is, wherein the troughs each have a penetrated by the branch pipe intermediate bottom, which as a gas and liquid-permeable storage element with a plurality of distributed over its surface passages for the pending on its underside Mixture of exhaust gas and the cleaning liquid is formed and bounded by the exhaust gas cleaning liquid bath down, and wherein the rising from the Reinigungsflüssigkeitsbad exhaust gas is passed with at least one deflection on the manifold over to the exhaust outlet.

With the help of the branch pipe of a manifold associated total volume flow is divided into several small streams, allowing intensive contact of the exhaust gas sprayed with the sprayed into the branch pipe and atomized cleaning liquid. The branch pipe associated valve body advantageously allow a uniform Actuation of all branch pipes and at the same time cause a directional deflection from the vertical to the horizontal direction, which ensures a good distribution of the effluent from the branch pipe mixture of exhaust gas and droplets of cleaning liquid on the entire cross section of the associated tub. This process takes place in an advantageous manner below the gas- and liquid-permeable, planar stowage element. A large part of the droplets loaded with impurities is already absorbed by the cleaning liquid filling present below the damming element. The exhaust gas and the remainder of the droplets are in the form of a pillow, etc. on the underside of the storage element and passes through the plurality of small, distributed over the surface of the baffle passages in the form of small bubbles or beads or as eddy current in the above the baffle element intended cleaning fluid bath, which absorbs the remaining droplets. The damming element and the exhaust gas that penetrates or penetrates the latter prevent the cleaning fluid bath from sinking. From the exhaust gas rising from the cleaning liquid bath, the entrained droplets are separated by changing the direction. Subsequently, the purified exhaust gas is guided past the distributor pipe or the distributor pipes and heated in this way. The measures according to the invention thus clearly enable a reliable cleaning of the exhaust gas, whereby the energy losses to be accepted are comparatively small.

An expedient embodiment of the parent device may consist in that the distributor tube or the distributor tubes is or are arranged in the upper region of the pressure vessel below the upwardly outgoing exhaust gas outlet. This favors the automatic heating of the purified exhaust gas flowing to the exhaust outlet.

A further advantageous measure may be that the valve body is adjustable relative to the lower end of the respective associated branch pipe. This allows a precise adjustment of the available flow cross-section and thus a very accurate Homogenization of the flow through all branches, so that the same treatment conditions result in the associated tubs.

Appropriately, each branch pipe is assigned a separate tub. This leads advantageously to a large number of smaller individual tubs, in which a very uniform distribution of the mixture of exhaust gas and cleaning liquid droplets emerging from the respectively assigned branch pipe can be achieved. The juxtaposition of several small individual tubs also allows a good utilization of the available space and at the same time results in the case of installation of the cleaning device in a ship a large allowable inclination angle.

In further development of the above idea, each row of transversely to the container axis juxtaposed branch piece expediently be assigned to a partitioned by intermediate walls in individual tubs tub cassette, the intermediate walls may be useful provided above the intermediate floor with overflow openings. This ensures that fluctuations in the fluid supply of a tub can be compensated by the overflow of the adjacent tub or tubs.

The troughs suitably have a lower fluid outlet and upper overflow edges, over which excess cleaning fluid can flow off and the impurities contained therein can be removed. The liquid outlet is expediently dimensioned in such a way that less liquid flows through it than meets via the assigned branch pipe, so that the upper overflow edges are always flushed over. A level monitoring is hereby advantageously superfluous.

A further advantageous embodiment of the higher-level measures may consist in the fact that at a distance above the trays deflecting plate which is penetrated by the branch stubs, whose side edges are bounded by the adjacent container walls, lateral flow passages. The rising from the tub exhaust gas is laterally through the deflector distracted and thus diverted. In the exhaust gas contained liquid droplets are thereby forced outward due to the centrifugal forces acting on it and can be deposited in this way. Appropriately, it can be attached to the lateral container walls above the Umlenkschilds catch drip attached.

The achievable with the aid of the measures of the invention exhaust gas quality advantageously facilitates exhaust gas recirculation, ie an admixture of exhaust gas to the charge air supplied to the engine, whereby the NO _x emissions can be reduced. Suitably, the device according to the invention can therefore be integrated into an exhaust gas recirculation device and acted upon by recirculatable exhaust gas.

Further advantageous embodiments and expedient developments of the parent measures are specified in the remaining subclaims and from the following description of the example with reference to the drawing closer.

In the drawing described below:

1 shows a longitudinal section through an exhaust gas according to the invention

Cleaning device

FIG. 2 shows a cross section along the line II / II in FIG. 1,

FIG. 3 shows the lower region of a branch pipe with an associated tank in section;

FIG. 4 shows a functional diagram of the device according to the invention,

FIG. 5 shows a tray arrangement, inclined relative to the horizontal, of a tray arrangement according to the invention, e.g. installed on a ship

Cleaning device Figure 6 is a schematic representation of a two-stroke large diesel engine with exhaust gas recirculation and purification and

Figure 7 is a schematic representation of a two-stroke large diesel engine with a built-in exhaust line cleaning device.

Main field of application of the present invention are large engines, especially two-stroke large diesel engines, such as those used as marine propulsion.

The exhaust gas purification device on which FIGS. 1 and 2 are based consists of a barrel-shaped pressure vessel 1, which is accommodated on a support frame 1a provided with feet. The pressure vessel 1 has an end face arranged exhaust inlet 2 and an outgoing upward

Exhaust outlet 3 and is provided at the bottom with a water outlet 4.

The barrel-shaped pressure vessel 1 consists of a cylindrical central part, which is closed by two frontally flanged lid. The exhaust gas inlet 2 is arranged in the upper region of a frontal lid. The exhaust outlet

3 is located approximately in the middle of the apex portion of the cylindrical central portion.

Appropriately, at least one, preferably a plurality of portholes 5 are provided in the region of the central part and / or the cover, via which the processes in the interior of the pressure vessel 1 can be observed from the outside.

In the upper region of the interior 6 of the pressure vessel 1, an arrangement with at least one horizontal distribution pipe 7 is provided, which extends approximately over the length of the central part of the pressure vessel 1 and communicates with the exhaust gas inlet 2. In the illustrated example, as best seen in Figure 2, several, here three parallel juxtaposed distribution pipes 7 are provided which via a connected to the exhaust inlet 2, provided with a corresponding number of connecting piece distributor piece 8 with the exhaust inlet 2 are connected. From each manifold 7 go several, distributed over its length, vertical branch pipe 9 from below, each receiving a partial flow of the associated distribution pipe 7 exhaust gas flow rate. In the illustrated embodiment, as can be seen graphically in FIG. 2, the branch nozzles 9, which descend from the three distributor tubes 7, are each arranged in the form of rows extending transversely to the container axis.

The branch pipe 9 are associated with spray nozzles 10, which can be acted upon with a cleaning liquid. The cleaning liquid may conveniently be water, also salt water or brackish water, with or without the addition of chemicals. The spray nozzles 10 are expediently designed as atomizer nozzles, which atomize the supplied cleaning liquid into very fine, small droplets, so that together with the branch pipe 9 supplied exhaust gas results in a mist or aerosol. The spray nozzles 10 are arranged in the upper region of the respective associated branch pipe 9. In this case, each branch pipe can be assigned a plurality of radial spray nozzles. In the example shown, each branch pipe 9 is associated with a centrally disposed spray nozzle 10, which is attached to the lower end of a lance 11 passing through the associated distributor pipe 7. The lances 11 are connected in a manner not shown here, for example via a common supply line, with a cleaning liquid source.

Trays 12 are placed below the branch stubs 9 into which the branch stubs 9 protrude with their lower open ends, as best seen in FIG. Each branch pipe 9 is expediently associated with a separate tank 12, wherein the a series of the above-mentioned type, juxtaposed branch pipe 9 associated tubs 12, as shown in Figure 2 can be seen to be connected to a width of the interior 6 continuous cassette 13 can.

The open lower end of the branch pipe 9 is in each case a valve body 14th assigned, which is appropriately adjustable. Hereby, the clear distance between the valve body 14 and the lower end of the associated branch pipe 9 and thus the available flow cross-section can be adjusted. The adjustment is expediently carried out so that the exhaust volume throughput through all branches 9 is the same. The adjustable valve body 14 is, as best seen in Figure 3, taken on a coaxial with the associated branch pipe 9 rod 15 which is attached at its upper end to at least one attached to the inner wall of the associated branch pipe 9 strut 16. Of course, several in height and / or circumferentially offset from each other struts may be provided. The rod 15 may be formed as a threaded rod on which the associated valve body 14 fixing nuts 17 are screwed, by means of which an adjustment of the valve body 14 is possible.

The top of the valve body 14 is, as can be seen further in FIG. 3, formed as a surface of revolution formed by a concave downwardly curved generatrix, so that in cross-section downwardly concave flanks are formed, which form a curved transition from the vertical direction to the horizontal direction , With the help of this conical design of the valve body 14, a deflection of the branch pipe 9 in the vertical direction flowing through the volumetric flow is effected in the horizontal direction, from the branch pipe 9 exiting distributed accordingly in the horizontal direction in the respective associated trough 12. The on the mass-afflicted droplets, which are accelerated in the radial direction caused by the valve body 14 deflecting attacking, a change in direction counteracting inertial forces in this case already lead to a separation of droplets from the deflected Ström. This concerns in particular the heavier droplets. The separated droplets are virtually absorbed by the surrounding cleaning liquid in the tub 12.

The troughs 12 are in each case through an interposed by the associated branch pipe 9 intermediate bottom 18 in a lower compartment 19, in which the associated branch pipe 9 opens with its lower, open end and in which the valve body 14 is located, and an upper compartment 20 divided. In operation, 20 cleaning fluid is present both in the lower compartment 19 and in the upper compartment. Each tray 12 accordingly includes a two-part through the intermediate bottom 18 cleaning liquid bath. The intermediate bottom 18 is formed as a gas- and liquid-permeable, sheet-like storage element containing a plurality of distributed over its area, narrow passages between the lower compartment 19 and the upper compartment 20 and, accordingly, between the lower and upper part of the Reinigungsflüssigkeitsbads. For this purpose, the stowage element forming the intermediate bottom 18 may be formed as a single-layer or multi-layer grid and / or network of a close-meshed grid or net, or wire mesh or expanded metal or as a similar permeable structural element or structural element packet arrangement, eg of metal and / or plastic foam. The intermediate bottom 18 is, as Figure 3 further reveals, supported at the edge on trough-fixed support strips 21 and fixed by means of a the associated branch piece 9 comprehensive and by screws 22 thereto fixed sleeve 23 from above.

Between the intermediate floor 18 and the support rails 21 may be a suitable height spacer arrangement 21a, e.g. inform of resting on the support strips 21 strips or a resting on the support strips 21 frame, etc. may be provided. With the help of

Distance element arrangement allows the position of the intermediate bottom 18 relative to the lower end of the associated branch pipe 9 to adjust exactly.

In operation, the distribution pipes 7 are acted upon with exhaust gas, which, as indicated in Fig. 4 by arrows, is distributed to the branch pipe 9. At the same time the spray nozzles 10 are supplied with cleaning liquid, expediently in the form of water, which is finely atomized, so that very fine droplets are formed and in the branch pipe 9 a mist or aerosol is formed. In the spray treatment zone thus formed within the branch pipe 9 in a first treatment step, the solid contained in the exhaust gas Contaminants that form condensation nuclei, by the droplets of the cleaning liquid, here the water droplets, detected and carried by them. Likewise, the leachable gases contained in the exhaust gas are washed out of the water droplets and carried by them.

From the branch pipe 9 exiting exhaust gas-water mixture aerosol is introduced for further treatment in the cleaning liquid bath contained in the associated tub 12. As can be seen from the flow arrows of FIG. 4, a deflection from the vertical direction into the horizontal direction results through the valve body 14, the cleaning liquid contained in the lower compartment 19 being displaced from the region adjacent to the intermediate bottom 18, as in FIG an irregular surface 24 is indicated. At the same time a larger part of the water droplets penetrate into the cleaning liquid contained in the lower compartment 19 and is absorbed by the latter. The exhaust gas with the rest of the water droplets are in the form of a pad 25 on the underside of the baffle formed by the intermediate bottom 18 and pass through the fine passages of the baffle in the upper compartment 20, wherein the still passing water droplets are absorbed by the existing cleaning liquid there and the exhaust gas bubbles upwards in the form of fine bubbles or beads 26, the residual impurities remaining in the exhaust gas being captured by the cleaning liquid and passing into it. Overall, this results in several treatment steps, namely the treatment in the spray treatment zone and in the lower and upper Reinigungsflüssigkeitsbad.

The liquid filling of the tubs 12 receives in the form of sprayed from the spray nozzles 10 cleaning liquid constant supply The tubs 12 are accordingly provided with a bottom-side drain opening 27, which is expediently arranged at the lowest point of the inclined tank bottom. The drain opening 27 is dimensioned so that can run over this less cleaning fluid replenishment comes. The excess runs over the upper edges of the trays 12, which accordingly form overflow edges 28, as can be seen in FIG. The from the tubs 12 down effluent or overflowing over the overflow edges 28 cleaning liquid is collected in the lower region of the interior 6 of the pressure vessel 1 and flows through the downwardly outgoing outlet 4 from.

The rising in the upper compartment 20 Reinigungsflüssigkeitsbad and, as indicated in Figure 4 by arrows, from the Reinigungsflüssigkeitsbad upwardly exiting, three-stage purified exhaust gas is deflected above the troughs 12 to cause one. For this purpose, as can be seen from FIGS. 1 and 2, above the trays 12 a deflector plate 29 penetrated by the branching stubs 9 with a degree of freedom of movement is arranged whose side edges form gap-shaped, lateral flow passages 30 with the adjacent side walls of the pressure vessel 1. The rising from the trays 12 exhaust gas is accordingly guided along the underside of the deflector 29 approximately horizontally radially outward and deflected there. To reinforce the deflection, the lateral flanks of the deflector shield 29, as can be seen from Figure 2, be bent downwards. The deflector shield 29 is expediently located at the middle height of the barrel-shaped pressure vessel 1, where the largest clear width is present, so that the exhaust gas is guided back in through the wall of the pressure vessel 1 after the said lateral flow passages 30, which causes the deflecting effect even stronger. Due to the deflection water droplets carried by the exhaust are thrown radially outward and run along the wall of the pressure vessel 1 downwards. In order to ensure that no water droplets can be entrained up to the exhaust outlet 3, drip catch strips 31 projecting inwards from the wall inside of the pressure vessel 1 are provided above the flow passages 30. These are expediently inclined downwards.

The exhaust gas passing through the flow passages 30 flows close to the wall to the distribution pipes 7 to the exhaust gas outlet 3. The distribution pipes 7, which are supplied with fresh exhaust gas inside, act as heating pipes, where the exhaust gas flowing past is heated. To reinforce this effect, the distribution pipes 7 may be externally provided with heating ribs. That over the Exhaust gas outlet 3 discharged exhaust gas can either be used for exhaust gas recirculation and / or supplied to an exhaust.

Large engines of the type mentioned above are often used as a ship propulsion. Ships in the water can tilt sideways, which also leads to a

Inclination of the device according to the invention and in particular of the troughs 12 may result, as indicated in Figure 5. Since each branch pipe 9 is assigned a separate tank 12, many, relatively small

Troughs, so that even in the case of a relatively large inclination, the lower, open end of each branch pipe 9 still enough deep below the

Liquid level in the associated tub 12 is, as is clearly apparent from Figure 5.

To simplify the assembly, each one transverse to the container axis series of branch pipe 9 associated, juxtaposed tubs, as already mentioned above, be combined to form a common cassette 13, which is divided by intermediate walls 32 into individual trays, as best seen in FIG 2 is recognizable. The cassettes arranged one behind the other in the direction of the container axis may expediently be spaced apart from one another. The intermediate walls 32 are expediently provided in the region between the upper side of the intermediate bottom 18 and its upper edge with overflow openings 33, via which a fluid exchange between adjacent trays can take place. This ensures that, regardless of the supply of liquid in all juxtaposed trays in about the same liquid level is achieved. The position of the overflow openings 33 is chosen so that even in the case of the greatest inclination acting as a damming intermediate shelf 18 is covered over the entire surface with cleaning fluid and accordingly also the open lower end of the branch pipe 9 is flooded over the entire surface, as Figure 5 shows clearly.

The cassettes 13 are, as Figure 2 further shows, provided with lateral support strips 34, which are provided on the container side support bars 35 can be placed. Suitably, the support strips 34 and / or the support strips 35 may be arranged to be adjustable in height, so that the immersion depth of the branch pipe 9 is also adjustable.

Figures 6 and 7 show application examples of the above-described multi-stage exhaust gas purification device. A preferred application, as already mentioned, is the purification of exhaust gas used for exhaust gas recirculation, ie of exhaust gas added to reduce the NO _x and / or SO _x emission of an engine, the fresh charge air supplied to this engine. Such an application is based on FIG.

In this case, an indicated in the form of a cylinder large engine in the form of a two-stroke large diesel engine 36 is shown. The outgoing from the working space of the cylinder, controllable by an exhaust valve outlet 37 opens into a cylinder over all exhaust manifold 38. In the lower part of the cylinder jacket inlet slots 39 are provided, through which the working space with lowered piston charge air is supplied. The engine is associated with an exhaust gas turbocharger 40, the turbine is operated with exhaust gas and the compressor supplies the pre-compressed charge air. Accordingly, the turbine of the exhaust gas turbocharger 40 is connected via an exhaust pipe 41 with the exhaust manifold 38. From the output of the compressor, a charge air line 42 leads to the inlet slots 39. The charge air is admixed with exhaust gas. For this purpose, branches from the exhaust pipe 41 from a recirculation line 43, which opens into the charge air line 42 or, as indicated by a broken line, in the intake of the compressor of the exhaust gas turbocharger 40. In the recirculation line 43, the exhaust gas cleaning device indicated by the pressure vessel 1 is integrated to purify the exhaust gas. Here, only the part of the exhaust gas is cleaned, which is used for recirculation.

It would also be conceivable to clean the entire exhaust gas before discharging into the environment. Such an embodiment is based on FIG. Here, the indicated by the pressure vessel 1 Emission control device installed in an outgoing from the outlet of the turbine of the exhaust gas turbocharger 40, opening into the environment exhaust pipe 44. Incidentally, the engine structure corresponds to the arrangement according to FIG. 6.

In the examples on which FIGS. 6 and 7 are based, each internal combustion engine is assigned in each case a single, own device according to the invention for exhaust gas purification. It would also be conceivable to assign a common device for exhaust gas purification according to the invention to an arrangement of several internal combustion engines. It would also be conceivable for an internal combustion engine to assign several devices according to the invention for exhaust gas purification. Another possibility is to deviate from the embodiments according to FIGS. 6 and 7 only to use the purified exhaust gas for exhaust gas recirculation and to blow out the remaining part as an exhaust gas. This applies to both on-board and stationary installations.

Although some embodiments and application examples are explained in more detail above, but without this being a limitation connected. On the contrary, a number of options are available to the person skilled in the art in order to adapt the general idea of the invention to the circumstances of the individual case.

Claims

1. A method for purifying engine exhaust gas, in particular at least one large engine, preferably two-stroke large diesel engine, wherein the exhaust gas to be cleaned first flows through a spray treatment zone and contacted there with a sprayed cleaning liquid, then leaving the spray treatment zone leaving the flow of exhaust gas and sprayed cleaning liquid a cleaning liquid bath is sent therethrough which absorbs the cleaning liquid portion of the introduced volume flow and wherein droplets of the cleaning liquid entrained by the exhaust gas rising from the cleaning liquid are separated by effecting a change of direction of the exhaust gas.

2. The method according to claim 1, characterized in that the spray treatment zone leaving the volume flow of exhaust gas and sprayed cleaning liquid is introduced into a provided below a gas and liquid-permeable storage element cleaning liquid and bubbled from here above a cleaning element above the damming.

3. The method according to claim 1 or 2, characterized in that the exhaust gas on exiting the spray treatment zone, a change in direction approximately in the horizontal direction, preferably by 90 ° experiences.

4. The method according to any one of the preceding claims, characterized in that the exhaust gas is heated after the deposition of entrained from the cleaning liquid bath droplets.

5. The method according to at least one of the preceding claims, characterized in that a non-foam-forming liquid, preferably water with or without the addition of chemicals is used as the cleaning liquid.

6. The method according to at least one of the preceding claims, characterized in that the cleaned exhaust gas at least partially for the Exhaust gas recirculation is used.

7. The method according to at least one of the preceding claims 1- 4, characterized in that the purified exhaust gas is at least partially discharged into the environment.

8. An apparatus for carrying out the method according to at least one of the preceding claims 1-7 with a pressure vessel (1) having an exhaust gas inlet (2) and an exhaust outlet (3) and with at least one, with the exhaust gas inlet (2) communicating manifold ( 7) is provided, from which an arrangement with one or more, in each case an exhaust partial flow associated branch pipe (9) going down to each of which at least one spray nozzle (10) is assigned for spraying a cleaning liquid and each in at least one associated, projecting upwardly open trough (12), wherein the open, lower ends of the branch piece (9) is associated with a valve body (14) effecting a flow deflection, the troughs (12) each having an intermediate bottom (18) penetrated by the branch stubs (9) ), which as a gas and liquid permeable storage element with a plurality of distributed over its surface passages for the formed on its underside pending mixture of exhaust gas and cleaning liquid and limited by the exhaust gas liquid bath down and wherein the rising from the liquid bath exhaust gas with at least one deflection on the manifold (7) over to the exhaust outlet (3) is performed.

9. Apparatus according to claim 8, characterized in that a plurality of parallel juxtaposed distribution pipes (7) are provided, of which in the transverse direction in rows side by side arranged branch pipe (9) go down.

10. Apparatus according to claim 8 or 9, characterized in that the

Distributor tube (7) or the distribution pipes (7) in the upper region of the pressure vessel (1) below the upwardly outgoing exhaust gas outlet (3) is or are arranged.

11. The device according to at least one of the preceding claims 8-10, characterized in that the spray nozzles (10) each at the lower end of the manifold (7) by cross, in the associated branch pipe (9) projecting lance (11) are mounted.

12. The device according to at least one of the preceding claims 8-11, characterized in that the valve body (14) relative to the lower end of the associated branch pipe (9) is adjustable.

13. The device according to at least one of the preceding claims 8-12, characterized in that the valve body (14) is designed as a rotational body with concave curved edges in the section.

14. The device according to at least one of the preceding claims 8-13, characterized in that the gas- and liquid-permeable storage element forming intermediate bottom (18) is formed by a single or multi-layer mesh and / or lattice work or as a metal foam or plastic foam body.

15. The device according to at least one of the preceding claims 8-14, characterized in that the intermediate bottom (18) at the edge supported on support strips (21) of the associated tub (12) preferably with the interposition of a spacer element arrangement and by means of at least one at the associated branch pipe (9). fixable sleeve (23) is held from above.

16. The device according to at least one of the preceding claims 8-15, characterized in that each branch pipe (9) is associated with a separate tub (12).

17. The device according to at least one of the preceding claims 8-16, characterized in that the troughs (12) have upper overflow edges (28) and / or a bottom-side provided liquid outlet (27) and that the pressure vessel (1) with a downwardly outgoing Liquid outlet (4) is provided.

18. The device according to at least one of the preceding claims 8-17, characterized in that at least one, preferably each row of transversely to the container axis juxtaposed branch pipe (9) by a partition walls (32) into individual trays (12) divided cassette (13) is assigned, which in the pressure vessel (1) can be fixed.

19. The apparatus according to claim 18, characterized in that the

Partitions (32) above the intermediate bottom (18) and below their upper edges with overflow openings (33) are provided.

20. The device according to at least one of the preceding claims 18 or 19, characterized in that the pressure vessel (1) inside with lateral

Support strips (35) is provided, on which the cassettes (13) can be supported, which are provided with lateral support strips (34).

21. The apparatus according to claim 20, characterized in that the height distance between the support strips (34) and the support strips (35) on and is lockable.

22. Device according to at least one of the preceding claims 18-21, characterized in that in the longitudinal direction of the container arranged in succession cassettes (13) are spaced from each other.

23. The device according to at least one of the preceding claims 8-22, characterized in that at a distance above the troughs (12) from the branch piece (9) penetrated Ableitschild (29) is arranged, whose side edges with the adjacent container walls lateral flow passages (30 ) limited.

24. The device according to claim 23, characterized in that the diversion shield (29) is arranged at average container height.

25. The device according to at least one of the preceding claims 23 or 24, characterized in that on the lateral container walls above the flow passages (30) inwardly directed drip catch strips (31) are mounted.

26. The device according to at least one of the preceding claims 8-25, characterized in that the pressure vessel (1) is installed in an exhaust gas recirculation line (43) provided with a Abgasrezirkuliereinrichtung large engine, in particular two-stroke large diesel engine.

27. The device according to at least one of the preceding claims 8-25, characterized in that the pressure vessel (1) is installed in an opening into the environment exhaust pipe (44) of a large engine, in particular two-stroke large diesel engine.

28. The device according to at least one of the preceding claims 8 - 27, characterized in that a pressure vessel (1) is associated with an arrangement of several internal combustion engines.

29.Vorrichtung according to at least one of the preceding claims 8 - 28, characterized in that an internal combustion engine is associated with a plurality of pressure vessel (1).

30.Vorrichtung according to at least one of the preceding claims 8 - 29, characterized in that the purified exhaust gas is divided into at least one exhaust gas recirculation line (43) and at least one exhaust pipe (44).