JP2020076322A - Tip structure of psa device silencer and psa device silencer - Google Patents

Abstract

To provide a tip structure of a PSA device silencer which can be employed even to an existing device, and is high in a silencing effect while being easy in maintenance, in the tip structure from which a large amount of exhaust gases such as the exhaust emission of a PSA device are vigorously discharged, and to provide the PSA device silencer having the tip structure.SOLUTION: A tip structure 7 of a PSA device silencer 1 arranged at a tip of the PSA device silencer 1, and reducing an exhaust sound at the discharge of atmospheric air has: a bottomed cylinder body 23 which is opened at a base end side, and has a connection part 21 detachably connected to a first silencing part 5 at an upstream side of the PSA device silencer 1 at the base end side, and is closed at a tip side; an acoustic absorbent 29 charged into the bottomed cylinder body 23; and an exhaust port 25 formed at a peripheral face of the bottomed cylinder body 23 at the base end side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tip end structure of a silencer for a PSA device that is provided in an exhaust pipe of a PSA device (Pressure Swing Adsorption) and silences exhaust sound, and a silencer for a PSA device having the tip structure.

  One of the devices for separating oxygen and nitrogen in air is a PSA device (Pressure Swing Adsorption) that utilizes the difference in adsorption rate and adsorption amount. The PSA apparatus has a plurality of towers, and each tower has a cycle of (i) adsorption → (ii) pressure equalization → (iii) desorption → (ii) pressure equalization → (i) adsorption Generating nitrogen gas.

  Particularly in (iii) desorption cycle, the air filled in the adsorption tower is exhausted at once, so a very loud exhaust noise is generated. For this reason, a muffler is attached to the exhaust line of the adsorption tower, and this muffler reduces exhaust noise, but in recent years it has been required to further reduce the noise level from the viewpoint of improving the working environment. ing.

By the way, generally, there are various types of silencers (silencers) for preventing noise when exhaust gas is emitted from a device or the like, depending on the application. For example, as an example of the structure of a ventilation duct silencer, there is a "ventilation duct silencer" disclosed in Patent Document 1.
Further, Patent Document 2 discloses a silencer that is installed in an exhaust system of an internal combustion engine of an automobile and reduces exhaust noise. The silencer disclosed in Patent Document 2 has a structure having a small hole in an inner pipe through which exhaust gas flows and an outer pipe outside thereof, as shown in FIGS. 1 and 2 of the publication.

  As described above, although there is a common point in that the exhaust gas is silenced, there are various ones depending on its use. In the above two examples, the end portion is opened as it is, which is composed of a linear cylinder in the flow direction of the exhaust gas. The shape is so large that it is not always suitable for silencing the exhaust gas from the PSA device that exhausts a large amount of exhaust gas intermittently and vigorously according to the operation timing.

  As a silencer for a PSA device, for example, as shown in FIG. 7, a sound absorbing duct silencer 45 in which a curved pipe 43 is provided at the tip of a silencer 41 is known. The bent pipe 43 is connected to the downstream end of the muffling section 41, is bent at about 90 °, and is open at the end. The tip is opened downward so that rainwater does not enter the muffler. The structure of the tip of the conventional sound-absorbing duct silencer 45 shown in FIG. 7 has a bent pipe 43, but since the exhaust gas is discharged in the axial direction of the pipe, generation of large noise caused by the kinetic energy of the exhaust gas is avoided. could not.

  Then, as a thing specialized in the noise suppression measure of the exhaust gas of the PSA device which is intermittently and vigorously discharged, Patent Document 3 discloses "an exhaust silencer of a gas separation device by the PSA method". According to the one disclosed in Patent Document 3, the structure in which the PSA device main body is installed has a hollow behavior, and the exhaust gas generated intermittently is introduced into the structure to reduce noise during operation. It is a thing.

Japanese Patent No. 5713957 JP 2017-160870 JP Japanese Patent Laid-Open No. 11-57374

Certainly, the one disclosed in Patent Document 3 is specialized for the PSA device, and a silencing effect can be expected. However, the structure of Patent Document 3 can be installed at the time of new installation because it has a large-scale structure, but it is difficult to apply it to the modification of the existing device.
In addition, maintenance is difficult because the inside of the gantry is an exhaust passage.

  The present invention has been made to solve such a problem, and is applicable to an existing device in a device in which a large amount of exhaust gas is intermittently and vigorously exhausted like the exhaust of a PSA device, and maintenance is also possible. It is an object of the present invention to provide a silencer for a PSA device, which is easy and has a high silencing effect, and a silencer for a PSA device having the tip structure.

(1) A tip end structure of a silencer for a PSA device according to the present invention is provided at a tip end portion of a silencer for a PSA device for reducing exhaust noise at the time of release to the atmosphere,
A bottomed cylindrical body having a base end side opening and a connection part that is detachably connectable to the upstream side silencing part in the silencer on the base end side, and the tip side is closed.
A sound absorbing material filled in the bottomed cylinder and an exhaust port formed on a peripheral surface of the bottomed cylinder on the base end side.

(2) Moreover, in the thing described in said (1), the said sound absorbing material has a laminated sound absorbing material laminated | stacked toward the bottom part in the said cylindrical body with a bottom.

(3) Further, in the device described in (1) or (2) above, a guide member for guiding the exhaust gas from the exhaust port horizontally or upward is provided.

(4) Further, a silencer for a PSA device according to the present invention is characterized by having the tip structure described in any one of (1) to (3) above.

  A tip end structure of a silencer for a PSA device according to the present invention is provided at a tip end part of a silencer for a PSA device to reduce exhaust noise at the time of emission into the atmosphere, and the base end side is open and A bottomed cylindrical body having a connection portion that can be detachably connected to the upstream silencing portion of the silencer on the proximal end side, and the distal end side is closed; and a sound absorbing material filled in the bottomed cylindrical body, By having an exhaust port formed on the base end side peripheral surface of the bottom cylindrical body, the sound absorbing material effectively attenuates the kinetic energy of the exhaust gas that is intermittently and vigorously discharged, and thus the exhaust sound is effective. Can be reduced. Further, since it has a connecting portion that can be detachably connected to the upstream muffler, it is suitable when it is applied to an existing muffler because simple modification is required.

It is a figure showing the state where the appearance of the silencer for PSA devices concerning this embodiment was seen from the slanting lower part. It is explanatory drawing of the internal structure of the silencer for PSA apparatuses shown in FIG. It is explanatory drawing of the structure of the upper end of the 1st silencing part which is a component of the silencer for PSA apparatuses. FIG. 2 is an enlarged view of the inside of the tip end structure of the silencer for PSA device shown in FIG. 1. It is explanatory drawing of the external appearance of the front-end | tip part structure shown in FIG. It is explanatory drawing of the internal structure by the side of the base end of the front-end | tip part structure of the silencer for PSA apparatuses shown in FIG. It is explanatory drawing of the structure of the front-end | tip part of the conventional silencer for PSA apparatuses.

The silencer 1 for a PSA device according to the present embodiment is provided in an exhaust pipe 3 that exhausts exhaust gas from the PSA device, and is for reducing exhaust noise at the time of release to the atmosphere. As shown, a first muffling section 5 (A in the figure) which is connected to the exhaust pipe 3 and serves as a first muffling section, and a tip which is connected to the tip of the first muffling section 5 and becomes a second muffling section. And a partial structure 7 (B in the figure).
Hereinafter, each component will be described in detail.

<First muffling section>
As shown in FIG. 2, the first muffling section 5 includes a tubular inner pipe 11 connected to the exhaust pipe 3 by the lower flange 9, and an outer tubular pipe 13 provided so as to cover the inner pipe 11. ing.
The inner tube 11 has a plurality of small holes 15 on its peripheral surface and has an open front end. In FIG. 2, the small hole 15 is shown in a part of the peripheral surface of the inner pipe 11, but this is omitted to prevent the drawing from being complicated, and in reality, the small hole 15 is small. The holes 15 are provided on the entire peripheral surface of the inner pipe 11.

As shown in FIGS. 2 and 3, the upper end of the inner pipe 11 projects above the upper flange 17. This is because the tip portion of the inner tube 11 is inserted into the tip structure 7 as described later.
The sound absorbing material 19 is provided on the inner peripheral surface of the outer tubular tube 13, and no gap is provided between the sound absorbing material 19 and the inner tube 11.

<Tip structure>
As shown in FIGS. 4 and 5, the tip end structure 7 has a connecting portion 21 that is open at the base end side and is detachably connectable to the first muffling portion 5 at the base end side, and the tip end side is closed. It has a bottom tubular body 23, a sound absorbing material 29 filled in the bottomed tubular body 23, and an exhaust port 25 formed on the peripheral surface of the bottomed tubular body 23 on the base end side.

The connecting portion 21 is attachable to and detachable from the outer cylinder tube 13 by bolting to the upper flange 17 of the outer cylinder tube 13 (see FIG. 5).
The bottomed cylindrical body 23 is a cylindrical body having a closed front end, and an exhaust port 25 is provided on the peripheral surface on the proximal end side thereof. The exhaust port 25 is provided with a net 27 as shown in FIG.

A sound absorbing material 29 is arranged in the bottomed tubular body 23. The sound absorbing material 29 includes a cylindrical sound absorbing material 29a arranged so as to cover the inner peripheral surface of the bottomed tubular body 23 (including the portion of the exhaust port 25), and a bottom surface inside the cylindrical sound absorbing material 29a. The laminated sound absorbing material 29b is provided so as to be laminated toward the bottom portion (tip portion) of the cylindrical body 23.
As shown in FIG. 4, since the laminated sound absorbing material 29b is laminated toward the upper end from the position slightly displaced from the base end of the bottomed tubular body 23, the circular concave portion 31 is formed on the base end side. Are formed (see FIG. 6).

  As described above, the upper end of the inner pipe 11 of the first silencing part 5 projects upward (see FIG. 3), and in the state where the tip structure 7 is connected to the first silencing part 5, the tip of the inner pipe 11 is It is arranged so as to project toward the tip structure 7. Therefore, as shown in FIG. 4, the tip of the inner pipe 11 is inserted into the recess 31 surrounded by the cylindrical sound absorbing material 29a. The reason for projecting the tip of the inner pipe 11 is to prevent outdoor rain and snow from entering the path of the exhaust gas inside.

The operation and effect of the silencer 1 for PSA device of the present embodiment configured as described above will be described.
Exhaust gas discharged from the exhaust pipe 3 passes through the first muffling section 5 and reaches the tip structure 7.
The inside of the tip end structure 7 has a dead end due to the bottomed cylindrical body 23 in which the sound absorbing material 29 is arranged. Therefore, exhaust gas is discharged toward the front end side. The direction is changed and the gas is exhausted from the side exhaust port 25.
That is, the exhaust gas collides with the laminated sound absorbing material 29b in the bottomed tubular body 23, and due to this collision, the sound absorbing material 29 is deformed, the kinetic energy of the exhaust gas is reduced, and the exhaust gas is discharged from the exhaust port 25 in a different direction. It
The sound generated when the exhaust gas collides with the laminated sound absorbing material 29b is absorbed by the cylindrical sound absorbing material 29a arranged around the laminated sound absorbing material 29b.

  Since the sound absorbing material 29 is pushed upward in the vertical direction by the exhaust gas, it is considered that the pushed up sound absorbing material 29 is compressed and the resistance to the gas increases with the passage of time, but the exhaust gas is exhausted to the side exhaust port 25. Therefore, the exhaust resistance does not increase due to the compression of the sound absorbing material 29, and even if the PSA device is used for a long period of time, the exhaust failure of the PSA device hardly occurs and the performance does not deteriorate.

As described above, according to the silencer 1 for a PSA device having the tip structure 7 of the present embodiment, the kinetic energy of exhaust gas that is intermittently and vigorously discharged is effectively attenuated by the tip structure 7. Therefore, exhaust noise can be effectively reduced.
Further, since the tip structure 7 of the present embodiment is detachably attached to the upstream first silencing part 5, the tip of the first silencing part 5 is bent as shown in FIG. If the pipe 43 is used, the tip end structure 7 can be attached instead of the bent pipe 43, and it can be easily applied to the modification of the silencer of the existing PSA device.

Further, in the above example, the example in which the laminated sound absorbing material 29b and the cylindrical sound absorbing material 29a provided so as to surround the periphery of the laminated sound absorbing material 29b is shown inside the tip structure 7.
However, when the diameter of the silencer outlet structure is relatively large with respect to the amount of exhaust gas discharged, the noise reduction effect can be obtained without installing the cylindrical sound absorbing material 29a.

  Further, in the tip structure 7 of the present embodiment, the sound absorbing material 29 is installed for the purpose of reducing the energy of the exhaust gas by deforming itself, and therefore the sound absorbing material 29 is generally used. Besides the sound absorbing material, a heat insulating material or the like can be used as the sound absorbing material 29 of the present invention.

  Further, in the above example, the bottomed cylindrical body 23 in the tip structure 7 has a cylindrical shape, but the bottomed cylindrical body 23 of the present invention is not limited to a cylindrical shape, and for example, has a triangular cross section, It may be a quadrangle, a polygon, or the like.

  As described above, in the tip structure 7 of the embodiment, the exhaust gas is turned from the dead end and is exhausted from the side exhaust port 25. For this reason, the direction of the exhaust from the exhaust port 25 is not necessarily the horizontal direction, and some of them may be directed obliquely downward. However, since the upper flange 17 projects below the exhaust port 25, the exhaust directed downward directly by the upper flange 17 can be changed in the horizontal direction, so that it cannot be exhausted directly below.

However, since the lower side of the exhaust port 25 is also a space for the worker to work, the direction of the exhaust gas from the exhaust port 25 is set to the horizontal direction or the upper side (obliquely upward, from the viewpoint of further reducing noise to the worker). You may make it provide the guide member which guides right above.
Such a guide member may be, for example, a circular plate arranged on the upper surface of the upper flange 17 so as to project further outward than the upper flange 17, or may extend obliquely upward so as to surround the lower end of the exhaust port 25. A megaphone-shaped member or the like arranged may be considered.
Further, by setting the outer diameter of the upper flange 17 large, the same effect can be obtained, and in this case, the upper flange functions as a guide member.

  By providing the guide member, the direction of the exhaust gas from the exhaust port 25 can be guided in the horizontal direction or upward, and the exhaust gas can be prevented from hitting the workers around the device or other devices, and the maximum on the ground. The noise value can be reduced.

The sound deadening effect of the curved end portion 43 of the silencer as shown in FIG. 7 and the dead end structure 7 of the present invention were compared, which will be described below.
In the case of the conventional outlet structure shown in FIG. 7, when exhaust gas is discharged from one place in one direction at once, and exhaust gas with a pressure of 0.35 MPa is discharged to a pressure of 0.1 MPa for about 3 seconds, the measurement point (ground height The maximum noise value was 96 dB (A) at a height of 1.5 m and a silencer exit distance of 1.5 m.
On the other hand, under the same conditions, in the case of the silencer having the tip structure 7 of the present invention, the maximum noise value at the measurement point (ground height: 1.5 m, silencer exit distance: 1.5 m) is 91 dB (A). Yes, a noise value reduction of about 5 dB was achieved compared to that of FIG.
From the above, it was demonstrated that the tip structure 7 of the present invention has a high silencing effect.

1 PSA silencer 3 Exhaust pipe 5 First silencer 7 Tip structure 9 Lower flange 11 Inner tube 13 Outer tube 15 Small hole 17 Upper flange 19 Sound absorbing material (outer tube)
21 connection part 23 bottomed cylinder 25 exhaust port 27 net 29 sound absorbing material (bottomed cylinder)
29a Cylindrical sound absorbing material 29b Laminated sound absorbing material 31 Recessed portion <Conventional example>
41 silencer 43 curved pipe 45 sound-absorbing duct silencer

Claims (4)

A structure of a tip end portion of a silencer for a PSA device, which is provided at a tip end portion of the silencer for a PSA device for reducing exhaust noise when released to the atmosphere,
A bottomed cylindrical body having a base end side opening and a connection part that is detachably connectable to the upstream side silencing part in the silencer on the base end side, and the tip side is closed.
A structure of a tip end portion of a silencer for a PSA device, comprising: a sound absorbing material filled in the bottomed cylinder and an exhaust port formed on a peripheral surface of the bottomed cylinder on a base end side.   The tip end structure of the silencer for a PSA device according to claim 1, wherein the sound absorbing material includes a laminated sound absorbing material laminated on the bottomed tubular body toward a bottom portion.   The tip structure of the silencer for a PSA device according to claim 1 or 2, further comprising a guide member that guides exhaust air from the exhaust port in a horizontal direction or upward.   A silencer for a PSA device, which has the tip structure according to any one of claims 1 to 3.