JP2000249007A - Device for separating water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve separating capability of a device for separating water from air flow. SOLUTION: A water separator is disposed, which is constituted as a cyclone segment disposed horizontally and forming a projection surface downward, and which is provided with flow passages 10 enclosed to each other, a water drop collecting device of the flow passage is disposed in a region of a lowest level, a wall region having up-gradient connected to a collecting chamber 11 is constituted as a hollow wall of a double wall, and the hollow chamber of the hollow wall is connected to the collecting chamber 11, and a wall of a radial direction inside faced to a corresponding flow passage 10 is provided with a perforation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for separating water from an air stream, in particular a reciprocating piston engine, preferably
A device for separating water from compressed and cooled boost air supplied to a large cycle diesel engine, comprising a plurality of flow passages adjacent to each other, the flow passages being in the direction of air. It is provided with a water-trapping device which induces the conversion and which has a water-collecting device, each of which has a collecting chamber which is connected to a water discharging device and which is accessible from the inlet slit. .

[0002]

BACKGROUND OF THE INVENTION It has been empirically found that the separation efficiency of known arrangements of this type is not sufficient for a number of reasons. Therefore, there is a danger that water enters the cylinder together with the boost air, and this may lead to damage to the bearing surface of the cylinder liner and the piston ring. It has also been empirically found that the water droplets not separated at this time are dispersed throughout the flow passage. Therefore, it is difficult to vaporize the residual water in the boost air, and it is impossible at all unless the boost air is heated considerably. However, warming the boost air leads to increased fuel consumption.

[0003]

SUMMARY OF THE INVENTION Given the above, it is an object of the present invention to create an apparatus of the type mentioned at the outset with high separation efficiency, while avoiding the disadvantages of the known arrangements. is there.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the object is to provide a water separator which is arranged as a horizontal, downwardly convex, cyclone segment and which comprises flow channels which surround one another. In this case, the upwardly sloped wall regions respectively arranged in the collecting chambers are configured as hollow walls, and the hollow chambers of the hollow walls are connected to the collecting chambers and correspond to the hollow walls. The problem is solved in that the radially inner wall facing the flow passage is provided with perforations.

In this way, an arc-shaped flow path is obtained which is geometrically substantially similar to one another, whereby the air flow and the water droplets carried by the air flow by the centrifugal force are displaced in the radial direction of the corresponding flow path. It is pressed against the outer partition. Since the cyclone segments, which contain flow passages which are substantially concentric with one another, are convex downwards, i.e. are arranged below the axis, the centrifugal force is further increased by gravity. The flow strongly pressed against the radially outer flow passage preferably disposes a relatively large number of water droplets at the lowest level area via the inlet slit, i.e. further attributed to the radially outer flow passage partition. Since this is collected in the collecting chamber, only a small amount of water droplets can be seen downstream of the entrance slit. The water droplets are further pressed by the centrifugal force downstream of the inlet slit against the perforated wall of the hollow wall and enter the hollow chamber of the hollow wall through the perforation. Water in the hollow chamber of the hollow wall can be discharged to the collection chamber by the action of gravity. Therefore, a very high separation efficiency, which could not be achieved conventionally, is obtained as a whole. If still water droplets can still be seen at the outlet of the water separator, these water droplets are very fine and are concentrated in a very thin laminar flow near the wall. Thus, these water droplets can be completely evaporated by adding a relatively small amount of hot air. At this time, the additional heating of the boost air is substantially not a concern. This is because the added heat is consumed as heat of vaporization. Thus, the method of the invention advantageously enables a reliable operation with low wear and low energy consumption, and thus a good economy.

[0006] Preferred embodiments and advantageous developments of the invention are set out in the respective dependent claims. For example, the cyclone segments are expediently configured as cyclone halves extending over 180 °. This allows full use of the existing mounting space below the boost air cooler and below the boost air distribution pipe located next to it, which translates into a relatively long turning section and, Regardless, it results in a compact structure.

[0007] The essence of yet another preferred method is to construct the perforated wall of the hollow wall as a perforated plate. This results in a very simple and low-cost application.

[0008] In a further development of the superordinated method, the cavity may be provided with a water-permeable filler, preferably formed of a cotton wool mat. This prevents turbulence from occurring in the hollow chamber of the hollow wall and returning the water collected in the hollow chamber to the flow passage due to the turbulence.

A further object of the invention is to provide, in the area of the inlet of the flow passage, a deflection plate which rises from a radially inner partition and narrows the cross section of the flow passage. It is. The deflector supports the flow being pressed against a radially outer partition of the flow passage.

It is particularly advantageous if a vaporizer is provided in the region of the outlet of the flow passage, which is assigned to its radially outer partition. In the region of the outlet of the flow passage, the mounting of the vaporizer on the wall side supports a conservative use of hot air, since any remaining water droplets are possibly concentrated in a very thin laminar flow near the wall. be able to.

It is expedient if the heat energy extracted from the uncooled boost air in the region of the inlet of the boost air cooler can be supplied to the vaporizer. This results in a particularly simple and low-cost construction form.

[0012] Yet another suitable method that contributes to minimizing the use of hot air is to make the vaporizer operable with at least one water drop detector. To further increase its reliability, an alarm device which can be activated by a corresponding water drop detector can be provided.

Further preferred embodiments and suitable developments of the above-stated methods are described in the further dependent claims and also from the following detailed description of embodiments with reference to the drawings. It is.

[0014]

DETAILED DESCRIPTION OF THE INVENTION The main field of application of the invention is that it has at least one exhaust turbine supercharger, preferably two
This is a reciprocating piston engine as a large cycle type diesel engine.

The large-sized two-cycle diesel engine which is the basis of FIG. 1 is driven by exhaust gas discharged by the cylinder 1 and collected by the collecting pipe 2, and is a turbo for compressing boost air which can be supplied to the cylinder 1. It has a charger 3. The turbocharger 3 is followed by a boost air cooler 4, which lowers the temperature of the boost air. As a result of this cooling, water condenses and is subsequently separated from the boost air, thereby avoiding water-induced damage to cylinder liners and piston bearing surfaces. for that reason,
The boost air cooler is followed by a water separator 5.
The dry boost air flowing out of the water separator 5 extends over all cylinders 1 and the boost air cooler 4
Reaches the distribution pipe 6 arranged adjacent thereto, from which the cylinder 1 can be supplied.

The water separator 5 is configured as a cyclone half, that is, as a cyclone segment extending over 180 °. The cyclone segments are arranged laterally, that is to say with a horizontal axis, and with an upper horizontal axis. In this way, the shape of a cyclone half with an open top, which is the base of the water separator 5 and which is convex downward, is obtained.

The cyclone halves forming the water separator 5 are:
It has a frame 7 provided around the upper peripheral area surrounding the opening. With this frame, the above-mentioned cyclone half communicates with the lower side of the boost air cooler 4 including the outlet of the boost air cooler 4, and also communicates with the inlet connection pipe 8 which communicates with the distribution pipe 6. The boost air leaving the boost air cooler 4 is diverted 180 ° inside the subsequent cyclone half which forms the basis of the boost air cooler 4 and is subsequently supplied to the distribution pipe 6. This situation is indicated by arrows indicating the flow in FIG. The cross section of the cyclone half which forms the basis of the water separator 5 has a plurality of flow passages which are substantially concentric with one another and thereby geometrically similar, by means of an intermediate wall 9 which is only implied in FIG. Each of these flow passages is supplied with a partial flow of boost air. The arcuate intermediate wall 9 may be flanged to a semicircular end wall fixed to the frame 7, which forms the end surface of the cyclone half water separator 5. The same applies, of course, for the radially outer partition which extends parallel to the intermediate wall.

Each flow passage 10 has a water trap, as best seen in FIG. 2, which is located in the lowest level region of the respective flow passage 10. I have. The water drop collecting device is
It has one collection chamber each mounted on the radially outer wall of the corresponding flow passage 10, this collection chamber comprising:
Accessible from an inlet slit 12 interrupting the radially outer partition of the corresponding flow passage 10. The collecting chamber 11 is connected to the lateral water outflow passage 1 through the drain opening 13.
Connected to 4. This water outflow passage may be mounted on the adjacent end wall of the water separator 5. If the water outlet passages 14 are provided in the region of both end faces of the water separator, respectively, it is suitable for the purpose. At this time, if the bottom surface of the collection chamber 11 is inclined so that water can flow toward both sides, it is suitable for the purpose.

The air entering the flow passage 10 is pressed against the radially outer partition wall of the corresponding flow passage 10 by the centrifugal force and gravity acting on the air. The same is true for water droplets being carried into the air. Water droplets are also concentrated in the laminar flow region near the wall, whereby the majority is introduced into the corresponding collecting chamber 11 via the inlet slit 12. This is indicated by the arrow 15 in FIGS. At the entrance of the flow passage 10, a deflector plate 1 rising from a radially inner partition wall to narrow the cross section of the flow passage.
6 are provided. This deflecting plate also supports the flow so as to be pressed against the radially outer partition of each flow passage 10, and this state is indicated by arrows 1 indicating the flow.
7. Furthermore, with this help, the collecting chambers 11 each protruding into the adjacent flow passage 10 do not significantly disturb the flow.

The area of the intermediate wall 9 which continues from the entrance slit 12 or the collection chamber 11, ie, the area located on the downstream side, is a double-walled hollow wall as can be seen from FIGS. It is configured. Thereby, a hollow chamber 20 is formed, which is separated by the inner and outer walls 18 and 19, and the hollow chamber is connected to the corresponding collecting chamber 11. The inner wall 19 of the double-walled hollow wall facing the corresponding flow passage 10 is configured as a perforated plate with punched holes 21. The holes 21 form an entrance to the cavity 20, through which water droplets pressed against the wall 19 by centrifugal force can enter the cavity 20. The water entering the cavity 20 is guided by the unbroken outer wall 18 to the collection chamber 11 which is connected to the cavity 20 or forms a common chamber. In order to prevent turbulence, the hollow chamber 20 of the hollow wall described above may be provided with a water-permeable filler 22 which is suitable as a steel wool mat. If the collecting chamber 11 following the hollow chamber 20 is also filled with a steel wool mat, it is suitable for the purpose.

Since the flow passage partition located downstream of the entrance slit 12 has a double wall, there is an advantage that the collection chamber 11 having the corresponding entrance slit 12 can be easily manufactured. To do so, it is only necessary to apply a suitable bent edge 23a to the outer wall 18. Front edge 23a
Is provided in a wall region located downstream of the entrance slit 12.

Since the water droplets are efficiently separated via the perforations formed by the inlet slit 12 and the holes 21, there is no water or only a relatively small amount of water in the area of the outlet of the flow passage 10. Not expected. This small amount of water is then concentrated in the laminar flow near the very thin wall pressed against the radially outer partition of the corresponding flow passage 10 and can therefore be vaporized with relatively little energy supply It is. At this time, the supplied energy is substantially completely consumed as vaporized energy, so that the boost air is not heated, or at least not significantly, which has a positive effect on fuel consumption. For this purpose, the individual flow passages 10 are provided with a vaporizer 24 arranged at the outlet and assigned to the radially outer partition, which serves a purpose when supplied with hot air. I have. Each of the vaporizers 24 has a nozzle 25 and, as can be better seen in FIG. 3, a jet pipe 26 which can be supplied with hot air, which jet pipe is provided over the entire width of the water separator 5. . In the example illustrated in FIG. 3, the ejection pipe 25 is attached to an end of a hollow wall formed by the walls 18 and 19. Thus, the vaporizer 24
Has been found to be particularly advantageous for the flow.

The ejection pipe 26 is connected to a distribution device 27 shown in FIGS. 1 and 2 which is connected to a hot air source. In the illustrated example, the hot air supplied to the distribution device 27 is:
In the area of the inlet of the boost air cooler 4, it is sampled from the uncooled boost air, this state being shown in the supply line 2.
8. Preliminary room 4a for boost air 4
If it is not possible to achieve a sufficient pressure difference when hot air is sampled from the air, hot air may be introduced from the air flow in front of the diffuser 29 that blows out to the preliminary chamber 4a. The dynamic pressure of the compressor of the supercharger 3 becomes more effective.

The operation of the vaporizer 24 is performed by the distribution pipe 6.
Only if it is expected that there will still be water droplets in the boost air supplied to the air. For this purpose, as can be seen from FIG. 1, a water droplet detector 30 is provided in the inlet area of the water separator 5, and the amount of water droplets existing can be measured using this.
If the amount of water drops present exceeds a certain value, at which value the water drops can no longer be separated according to the invention, the vaporizer 24 is activated, just in case. A small amount of hot air is blown by the vaporizer into a laminar flow near the wall, possibly containing any remaining water droplets, as indicated by the flow arrow 31. In the example shown, a second outlet is provided at the outlet of the water separator 5 as further shown in FIG.
The water drop detector 30 is provided, whereby the alarm device 32 can be activated. Thereby, if the boost air supplied to the distribution pipe 6 does not take any measures and still contains water droplets, an alarm is sounded, so that it is ensured that the operator can start appropriate measures such as reducing the output. You.

[Brief description of the drawings]

FIG. 1 is a partial view showing a two-cycle large diesel engine equipped with a water separator of the present invention.

FIG. 2 is a radial sectional view schematically showing the water separator of FIG. 1;

FIG. 3 is an enlarged view showing a part of the water separator of FIG.

[Explanation of symbols]

 Reference Signs List 4 boost air cooler 5 water separator 6 distribution pipe 8 inlet connection pipe 10 flow passage 11 collecting chamber 12 inlet slit 14 water discharge device 16 deflection plate 18 wall 19 wall 20 hollow chamber 21 perforated 22 filler 22 vaporizer 25 nozzle 26 Ejection tube 30 Water drop detector 32 Alarm device

Claims (14)

[Claims] 1. A device for separating water from compressed and cooled boost air which is supplied to a reciprocating piston engine, preferably a large two-stroke diesel engine, for separating water from an air stream. The water separator (5) has a plurality of flow passages (1) adjacent to each other.
0), these flow passages cause air redirection and are equipped with water traps, which are connected to a water discharge device (14) and are accessible from the inlet slit (12). Each having one possible collecting chamber (11), said water separator being configured as a horizontally arranged downwardly convex cyclone segment and comprising flow passages (10) surrounding each other. The water trapping device of this flow channel is arranged in its lowest level area, and the wall area with the upslope respectively following said collecting chamber (11) is a double-walled hollow wall The hollow chamber (20) of the hollow wall is formed as the collecting chamber (1).
1) and the corresponding flow passage (1
The device characterized in that the radially inner wall (19) facing 0) is provided with perforations (21). 2. The device according to claim 1, wherein the cyclone segments forming the water separator are configured as cyclone halves extending over approximately 180 °. 3. The water separator (5) leads on the one hand to a boost air cooler (4) and on the other hand to an inlet connection pipe (8) of a distribution pipe (6) arranged next to it. Apparatus according to claim 1 or 2, characterized in that: 4. The perforated wall (1)
4. The device according to claim 1, wherein 9) is configured as a perforated plate. 5. The method as claimed in claim 1, wherein the hollow chamber (20) sandwiched between the hollow walls (18, 19) is provided with a water-permeable filler (22). An apparatus according to any one of the preceding claims. 6. The device according to claim 5, wherein the filler is configured as a cotton wool mat. 7. In the inlet area of the flow passage (10):
7. A device according to claim 1, further comprising a deflector (16) rising from the radially inner partition and narrowing its cross section. 8. The outlet area of said flow passage (10)
A vaporizer (24) arranged at the radially outer partition
The device according to any one of claims 1 to 7, wherein a device is provided. 9. The method according to claim 8, wherein the vaporizer has at least one jet tube with a nozzle which can be supplied with hot air. The described device. 10. The device according to claim 8, wherein the vaporizers are each integrated into a corresponding wall. 11. Apparatus according to claim 8, wherein the hot air that can be supplied to the vaporizer (24) can be taken from uncooled boost air. 12. The method according to claim 1, wherein the vaporizer (24) has
Device according to one of the claims 8 to 11, characterized in that it is operable by two water drop detectors (30). 13. The device according to claim 12, wherein the water drop detector (30) is arranged in the inlet area of the water separator (5). 14. The water separator (30) is preferably provided at the outlet of the water separator (5), by means of which the alarm device (32) can be activated. The device according to any one of claims 1 to 13.