JP2021184982A - Mist separation device - Google Patents

Abstract

To suppress that mist separated and removed from gas by a mist filter is contained in the gas again.SOLUTION: A mist separation device 1 is equipped with a filter portion 20 provided with a mist filter 25 capturing mist in gas when the gas passing through it, downstream side piping 30 that is connected to the filter portion 20 and into which the gas passing through the mist filter 25 flows. The downstream side piping 30 has adhering portions 32a and 32b that make the mist captured by the mist filter 25 collide with an inner wall surface of the downstream piping 30 to be adhered, by a flow of the gas passing through the mist filter 25 and flowing into the downstream side piping 30.SELECTED DRAWING: Figure 1

Description

The technique disclosed in the present application relates to a mist separating device.

Conventionally, a mist separating device in which a mist filter for separating and removing mist is housed in a casing has been known, and is disclosed in, for example, Patent Document 1. In the mist separation device of Patent Document 1, when a gas (compressed air) passes through the mist filter, the mist (liquid fine particles) contained in the gas is captured and separated by the mist filter. The gas from which the mist has been separated and removed is discharged from the outlet, while the mist captured by the mist filter grows and flows down as droplets of an appropriate size and is stored in the bottom of the casing.

Japanese Unexamined Patent Publication No. 10-180024

By the way, in the mist separating device as described above, when the gas from which the mist is separated and removed flows to the outlet, there is a possibility that the liquid stored in the bottom of the casing is taken again. In that case, the mist separation / removal performance is significantly reduced.

The technique disclosed in the present application has been made in view of such circumstances, and an object thereof is to prevent the mist separated and removed from the gas by a mist filter from being contained in the gas again.

The technique disclosed in the present application includes a filter unit and downstream piping. The filter unit is provided with a mist filter that captures the mist in the gas when the gas passes through. The downstream side pipe is connected to the filter portion, and the gas that has passed through the mist filter flows into the pipe. Then, the downstream side pipe collides the mist captured by the mist filter with the inner wall surface of the downstream side pipe by the flow of the gas passing through the mist filter and flowing into the downstream side pipe. It has an attachment part to be attached.

According to the mist separation device disclosed in the present application, it is possible to prevent the mist separated and removed from the gas by the mist filter from being contained in the gas again.

FIG. 1 is a cross-sectional view showing a schematic configuration of a mist separating device according to an embodiment. FIG. 2 is an enlarged cross-sectional view showing a main part of the mist separating device. FIG. 3 is an enlarged cross-sectional view showing a main part of the mist separating device.

Hereinafter, embodiments of the present application will be described with reference to the drawings. It should be noted that the following embodiments are essentially preferred examples and are not intended to limit the scope of the techniques disclosed in this application, their applications, or their uses.

The mist separation device 1 of the present embodiment captures and separates and removes mist (liquid fine particles) in steam. Steam is an example of a gas. As shown in FIG. 1, the mist separating device 1 includes an upstream side pipe 10, a filter unit 20, and a downstream side pipe 30.

The upstream side pipe 10 is a straight pipe extending in the vertical direction.

The filter unit 20 is provided with a mist filter 25 that captures the mist in the steam when the steam (gas) passes through. Specifically, the filter unit 20 has a casing 21 and a mist filter 25.

The casing 21 is formed in a flat, substantially columnar shape having an axial center extending in the vertical direction. The casing 21 has an upper plate 22, a bottom plate 23, and a side plate 24. Both the upper plate 22 and the bottom plate 23 are disk members. The upper plate 22 and the bottom plate 23 are arranged above and below each other. A side plate 24 is provided between the upper plate 22 and the bottom plate 23. The side plate 24 is formed in a cylindrical shape whose axial center extends in the vertical direction, and the upper end and the lower end are joined to the upper plate 22 and the bottom plate 23, respectively.

A through hole 23a is formed in the center of the bottom plate 23, and the upstream pipe 10 is connected to the through hole 41a. That is, the upstream pipe 10 and the internal space of the casing 21 communicate with each other through the through hole 23a. Further, a through hole 22a is formed in the center of the upper plate 22. A downstream pipe 30 is connected to the portion of the through hole 22a. That is, the downstream side pipe 30 and the internal space of the casing 21 communicate with each other through the through hole 22a.

The internal space of the casing 21 is formed as a filter chamber 26. The mist filter 25 is provided in the casing 21 (that is, the filter chamber 26). The mist filter 25 is, for example, a mesh demister. The mist filter 25 is formed in a substantially disk shape. The mist filter 25 is arranged so that the axis extends in the vertical direction. The diameter of the mist filter 25 is sufficiently larger than the diameters of the through holes 22a and 23a of the upper plate 22 and the bottom plate 23, respectively.

The downstream side pipe 30 is connected to the filter unit 20, and steam that has passed through the mist filter 25 flows into the pipe. Then, the downstream side pipe 30 collides with the mist captured by the mist filter 25 against the inner wall surface of the downstream side pipe 30 by the flow of steam passing through the mist filter 25 and flowing into the downstream side pipe 30 and adheres to the downstream side pipe 30. It has attachment portions 32a and 32b to be attached.

More specifically, as shown in FIGS. 2 and 3, in the downstream pipe 30, the inlet end 30a at one end is connected to the filter portion 20, and the outlet end 30b at the other end is open to the outside air. The downstream side pipe 30 has an inlet side outer pipe 31, a bent pipe 32, an outlet side outer pipe 33, an inlet side inner pipe 41, and an outlet side inner pipe 43.

The inlet side outer pipe 31 is connected between the filter portion 20 (casing 21) and the curved pipe 32. The inlet side outer pipe 31 is a straight pipe extending in the vertical direction. The inner diameter of the inlet-side outer pipe 31 is larger than the hole diameter of the through hole 22a of the casing 21. That is, the inlet side outer pipe 31 is connected to the outer edge portion of the through hole 22a in the casing 21.

The bent pipe 32 is connected to the inlet side outer pipe 31 and is indirectly connected to the filter unit 20 via the inlet side outer pipe 31. The curved pipe 32 is also called an elbow pipe, and in the present embodiment, the curved pipe 32 has a curved angle of 90 °. The bent pipe 32 has the same diameter at both ends. Then, as shown in FIG. 1, the inner wall surface of the bent pipe 32 is the above-mentioned attachment portions 32a and 32b.

The outlet side outer pipe 33 is connected to the side opposite to the filter portion 20 side of the curved pipe 32. The outlet side outer pipe 33 is a straight pipe extending in the horizontal direction.

The inlet side inner pipe 41 is inserted inside the inlet side outer pipe 31 and forms a double pipe with the inlet side outer pipe 31. The inlet side inner pipe 41 is a straight pipe extending in the vertical direction, and is provided coaxially with the inlet side outer pipe 31. The inner diameter of the inlet side inner pipe 41 is smaller than the inner diameter of the inlet side outer pipe 31, and is substantially the same as the hole diameter of the through hole 22a of the casing 21. That is, the inlet side inner pipe 41 is connected to the outer edge portion of the through hole 22a inside the inlet side outer pipe 31. The inlet side outer pipe 31 and the inlet side inner pipe 41 are provided at a predetermined interval.

The outlet side inner pipe 43 is inserted inside the outlet side outer pipe 33, and forms a double pipe with the outlet side outer pipe 33. Specifically, the outlet-side inner pipe 43 has a cylindrical portion 43a whose axis extends in the horizontal direction and a flange portion 43b. The flange portion 43b is integrally formed at one end (the right end portion in FIG. 3) of the cylindrical portion 43a. The cylindrical portion 43a of the outlet side inner pipe 43 is a straight pipe extending in the horizontal direction, and is provided coaxially with the outlet side outer pipe 33. The inner diameter of the outlet side inner pipe 43 (cylindrical portion 43a) is smaller than the inner diameter of the outlet side outer pipe 33. The outer diameter of the flange portion 43b is larger than the outer diameter of the outlet side outer pipe 33. The outlet side outer pipe 33 and the outlet side inner pipe 43 (cylindrical portion 43a) are provided at predetermined intervals.

A flange 45 is joined between one end of the outlet side outer pipe 33 and the flange portion 43b of the outlet side inner pipe 43.

Then, between the inlet side outer pipe 31 and the inlet side inner pipe 41, the mist adhering to the attachment portions 32a and 32b of the curved pipe 32 flows in and is stored along the inner wall surface of the inlet side outer pipe 31. The inlet side storage portion 42 is formed. The inlet side storage portion 42 is formed in a cylindrical shape extending in the vertical direction. That is, the lower end of the inlet-side storage portion 42 is closed by the upper plate 22 of the casing 21, while the upper end is open to the inside of the inlet-side outer pipe 31.

Further, between the outlet side outer pipe 33 and the outlet side inner pipe 43, the mist adhering to the attachment portions 32a and 32b of the curved pipe 32 flows in and is stored along the inner wall surface of the outlet side outer pipe 33. The outlet side storage portion 44 is formed. The outlet side storage portion 44 is formed in a cylindrical shape extending in the horizontal direction. That is, the right end of the outlet side storage portion 44 is closed by the flange portion 43b and the flange 45, while the left end portion is open to the inside of the outlet side outer pipe 33.

Further, the inlet-side outer pipe 31 is provided with a discharge port 47 through which the mist stored in the inlet-side storage section 42 is discharged. The outlet side outer pipe 33 is provided with a discharge port 48 through which the mist stored in the outlet side storage unit 44 is discharged.

In the mist separating device 1 configured as described above, steam flows in from the upstream pipe 10 and flows into the filter chamber 26 of the filter unit 20 as shown by an arrow (dotted) in FIG. The steam flowing into the filter chamber 26 passes upward through the mist filter 25. At that time, the mist in the steam is captured by the mist filter 25 and separated and removed. The mist captured by the mist filter 25 grows due to the wettability of the line and the capillary phenomenon, and becomes relatively large droplets.

The steam (dry steam) from which the mist has been separated and removed in the filter chamber 26 flows into the downstream side pipe 30 from the filter chamber 26 and flows out from the outlet end 30b of the downstream side pipe 30 (white outline shown in FIG. 1). See the arrow). That is, the steam from which the mist has been separated and removed by the mist filter 25 flows out to the outside through the inlet side outer pipe 31, the curved pipe 32, and the outlet side outer pipe 33.

The droplets grown from the mist are blown from the mist filter 25 toward the downstream pipe 30 by the flow of steam. The droplets (grown mist) blown into the downstream pipe 30 collide with the attachment portions 32a and 32b (inner wall surface) of the curved pipe 32 and adhere. In this way, the droplets adhering to the inner wall surface of the curved tube 32 do not easily separate from the inner wall surface because surface tension acts on them. Therefore, the droplets (mist) adhering to the adhering portions 32a and 32b are not contained in the steam again.

At the adhesion portions 32a and 32b, the droplets are blown one after another from the mist filter 25, so that the droplets grow here as well. Of the droplets attached to the attachment portions 32a and 32b, relatively large droplets flow down due to their own gravity and flow into and are stored in the inlet side storage portion 42. On the other hand, the relatively small droplets adhering to the adhering portions 32a and 32b, that is, the droplets that cannot flow down due to their own gravity, are the steam heading from the inlet end 30a to the outlet end 30b in the downstream pipe 30. By the flow, it flows through the inner wall surface of the outlet side outer pipe 33 and flows into and is stored in the outlet side storage unit 44. The liquid (drain) stored in the inlet side storage unit 42 and the outlet side storage unit 44 is discharged to the outside from the discharge ports 47 and 48.

As described above, the mist separation device 1 of the above embodiment is connected to the filter unit 20 provided with the mist filter 25 for capturing the mist in the steam when the steam passes, and passes through the mist filter 25. It is provided with a downstream pipe 30 into which the steam is discharged. Then, the downstream side pipe 30 collides with the mist captured by the mist filter 25 against the inner wall surface of the downstream side pipe 30 by the flow of steam passing through the mist filter 25 and flowing into the downstream side pipe 30 and adheres to the downstream side pipe 30. It has attachment portions 32a and 32b to be attached.

According to the above configuration, the mist (droplet) captured by the mist filter can be attached to the inner wall surface of the downstream pipe 30. The droplets adhering to the inner wall surface of the downstream pipe 30 do not easily separate from the inner wall surface because surface tension acts on them. Therefore, it is possible to prevent the mist separated and removed from the gas by the mist filter 25 from being contained in the gas again.

Further, in the mist separation device 1 of the above embodiment, the downstream side pipe 30 has a curved pipe 32 indirectly connected to the filter unit 20. The attachment portions 32a and 32b are inner wall surfaces of the bent pipe 32.

According to the above configuration, the mist can be effectively made to collide with the inner wall surface of the bent pipe 32. Therefore, the mist can be easily attached to the inner wall surface of the bent pipe 32.

Further, in the mist separation device 1 of the above embodiment, the downstream side pipe 30 is inserted inside the inlet side outer pipe 31 and the inlet side outer pipe 31 connected between the filter portion 20 and the curved pipe 32. It has an inlet-side inner pipe 41 that constitutes a double pipe with the inlet-side outer pipe 31. Between the inlet side outer pipe 31 and the inlet side inner pipe 41, the mist adhering to the attachment portions 32a and 32b flows in through the inner wall surface of the inlet side outer pipe 31 and is stored in the inlet side storage portion 42. Is formed.

According to the above configuration, a relatively large mist (droplet) can be stored in the inlet side storage unit 42. Since the inlet side storage portion 42 is formed by a double pipe structure provided at the inlet end 30a of the downstream side pipe 30, contact between the stored mist (droplet) and steam can be suppressed. .. Therefore, it is possible to further prevent the mist separated and removed from the gas by the mist filter 25 from being contained in the gas again.

Further, in the mist separation device 1 of the above embodiment, the downstream side pipe 30 is inserted into the outlet side outer pipe 33 connected to the side opposite to the filter portion 20 side of the curved pipe 32 and the inside of the outlet side outer pipe 33. It has an outlet-side inner pipe 43 that constitutes a double pipe with the outlet-side outer pipe 33. Between the outlet side outer pipe 33 and the outlet side inner pipe 43, the mist adhering to the attachment portions 32a and 32b flows in through the inner wall surface of the outlet side outer pipe 33 and is stored in the outlet side storage portion 44. Is formed.

According to the above configuration, a relatively small mist (droplet) can be stored in the outlet side storage unit 44. Like the inlet side storage section 42, the outlet side storage section 44 is also formed by a double pipe structure provided at the outlet end 30b of the downstream side piping 30, so that the stored mist (droplets) and steam can be used. Contact can be suppressed. Therefore, it is possible to further prevent the mist separated and removed from the gas by the mist filter 25 from being contained in the gas again.

Further, in the mist separation device 1 of the above embodiment, the inlet side outer pipe 31 and the outlet side outer pipe 33 have the discharge port 47, in which the mist stored in the inlet side storage section 42 storage section 42, 44 is discharged. 48 is provided.

According to the above configuration, the mist separated and removed by the mist filter 25 can be reliably discharged to the outside. It is possible to surely prevent the separated and removed mist from being contained in the gas again.

In the technique disclosed in the present application, one of the inlet side storage unit 42 and the outlet side storage unit 44 may be omitted in the above embodiment.

Further, in the above embodiment, the discharge ports 47 and 48 may be omitted.

Further, in the above embodiment, the bending angle of the bending pipe 32 is set to 90 °, but the bending angle is not limited to this, and may be, for example, 30 ° or 45 °.

The techniques disclosed in this application are useful for mist separators.

1 Mist separation device 20 Filter part 25 Mist filter 30 Downstream side piping 31 Inlet side outer pipe 32 Bent pipe 32a, 32b Adhesion part 33 Outer side outer pipe 41 Inlet side inner pipe 42 Inlet side storage part 43 Outlet side inner pipe 44 Outlet side Reservoir 47,48 Discharge port

Claims (6)

A filter unit provided with a mist filter that captures the mist in the gas when the gas passes through, and a filter unit.
It is provided with a downstream pipe connected to the filter unit and into which the gas that has passed through the mist filter flows.
In the downstream side pipe, the mist captured by the mist filter is made to collide with the inner wall surface of the downstream side pipe and adhere to the inner wall surface of the downstream side pipe by the flow of the gas passing through the mist filter and flowing into the downstream side pipe. A mist separating device characterized by having an adhering portion. In the mist separating device according to claim 1,
The downstream side pipe has a curved pipe that is directly or indirectly connected to the filter portion.
The adhering portion is a mist separating device characterized in that it is an inner wall surface of the bent pipe. In the mist separating device according to claim 1 or 2.
The downstream side pipe is inserted inside the inlet side outer pipe and the inlet side outer pipe connected between the filter portion and the curved pipe, and a double pipe is provided between the inlet side outer pipe. It has an inner pipe on the inlet side that constitutes
Between the inlet-side outer pipe and the inlet-side inner pipe, an inlet-side storage portion is formed in which mist adhering to the attachment portion flows in and is stored along the inner wall surface of the inlet-side outer pipe. A mist separation device characterized by being In the mist separating device according to claim 1 or 2.
The downstream side pipe is doubled between the outlet side outer pipe connected to the side opposite to the filter portion side of the bent pipe and the outlet side outer pipe inserted inside the outlet side outer pipe. It has an outlet side inner pipe that constitutes the pipe,
Between the outlet side outer pipe and the outlet side inner pipe, an outlet side storage portion is formed in which mist adhering to the attachment portion flows in and is stored along the inner wall surface of the outlet side outer pipe. A mist separation device characterized by being In the mist separating device according to claim 3,
The mist separation device is characterized in that the inlet-side outer pipe is provided with a discharge port for discharging the mist stored in the inlet-side storage portion. In the mist separating device according to claim 4,
The mist separation device is characterized in that the outlet-side outer pipe is provided with a discharge port for discharging the mist stored in the outlet-side storage portion.

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