JP2965251B1 - Cyclone type gas-liquid separator - Google Patents

Abstract

[PROBLEMS] To provide a new type of cyclone-type gas that can ensure high separation efficiency by using centrifugal force even when the flow rate of a gas-liquid two-phase flow to be introduced is not constant, such as when used in combination with a reciprocating compressor. Provided is a liquid separation device. SOLUTION: A cyclone-type gas-liquid separation device A is arranged coaxially through a closed cylindrical casing 1 and an upper surface thereof in this casing, and a gas-liquid two-phase flow is transmitted to a lower portion in the casing. An introduction pipe 3 that guides and jets out from a downward opening 3a; and a gas-liquid two-phase flow that is arranged in a fixed state facing the downward opening of the introduction pipe and jets out from the downward opening. And a vortex generator 31 that converts the vortex into a vortex that swirls between the surfaces. Further, an exhaust port 41 for discharging gas out of the casing is provided at an upper portion of the casing.
And a drain port 15 for discharging the liquid out of the casing at the bottom of the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cyclone-type gas-liquid separation apparatus for separating a gas-liquid two-phase flow using centrifugal force.

[0002]

2. Description of the Related Art Conventionally, when air containing no moisture is used in a chemical plant or the like, the atmosphere is compressed by a compressor or cooled by a cooler or the like to liquefy the moisture in the atmosphere. Air containing liquefied water droplets is separated into water and air containing no water droplets by a gas-liquid separator. As a gas-liquid separation device used in such an application, a baffle type in which a gas-liquid two-phase flow such as air containing water droplets collides with a baffle plate, and separation using a wire mesh in addition to the baffle plate A demister-type one and a cyclone-type one that separates using a centrifugal force are known.

A conventional cyclone type gas-liquid separator is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 5-23514, and as shown in FIGS.
And an introduction pipe b tangentially connected to the peripheral wall surface of the casing a and opening therethrough, and a coaxially arranged penetrating the bottom of the casing a in the casing a and having an upper end extending to an upper part in the casing a. Exhaust pipe c, which is open
And a drainage pipe d connected to the bottom of the container. And
An annular cross-sectional flow path e formed between the inner surface of the peripheral wall of the casing a and the outer surface of the exhaust pipe c through a gas-liquid two-phase flow through the introduction pipe b.
In this annular cross-sectional flow path e, the liquid droplets collide with and adhere to the inner surface of the peripheral wall of the casing a due to inertial force and centrifugal force, and then flow down to the bottom along the inner surface of the peripheral wall by the action of gravity. Accumulate. This is discharged out of the casing a by the drain pipe d. On the other hand, the gas swirls and rises in the annular cross section flow path e, flows into the exhaust pipe c from the upper end opening of the exhaust pipe c, passes through the exhaust pipe c, and is discharged out of the casing a.

[0004]

By the way, in the above-mentioned conventional cyclone type gas-liquid separation device, the size of each part of the device is determined by the flow rate (flow velocity) of the gas-liquid two-phase flow introduced from the introduction pipe b, and the baffle Higher separation efficiency can be ensured compared to a gas-liquid separator, but air containing water droplets compressed by a reciprocating compressor can be combined with air that does not contain water and water by a conventional cyclone gas-liquid separator. In the case of separation into two, there are the following problems.

That is, in a reciprocating compressor, the discharge flow rate changes every moment, and the discharge flow rate temporarily becomes zero when the piston passes through the top dead center or the bottom dead center. For this reason, in the conventional cyclone-type gas-liquid separation device, the gas-liquid two-phase flow introduced from the introduction pipe b is at the top and bottom dead center of the piston even when the dimensions of each part are designed based on any flow velocity. Stalling near the passage causes the centrifugal force to stop acting, and droplets collide with and adhere to the outer peripheral surface of the exhaust pipe c. Since the droplets are discharged together with the gas through the exhaust pipe c, the separation efficiency is reduced.

[0006] The present invention has been made in view of such a point, and an object thereof is to solve the problem even when the flow rate of the introduced gas-liquid two-phase flow is not constant as in the case of using with a reciprocating compressor. Effective for high separation efficiency using centrifugal force
The present invention provides a new type of cyclone type gas-liquid separation device which can be ensured at a low cost.

[0007]

According to a first aspect of the present invention, there is provided a cyclone-type gas-liquid separator, comprising: a closed cylindrical casing; And an inlet pipe that guides the gas-liquid two-phase flow to the lower part of the casing and ejects it from the downward opening, and is arranged in a fixed state facing the downward opening of the inlet pipe and ejects from the downward opening. A vortex generator that converts the gas-liquid two-phase flow into a vortex that swirls between the inner surface of the peripheral wall of the casing and the outer peripheral surface of the introduction pipe. An exhaust port for discharging gas to the outside of the casing is provided at an upper portion of the casing, and a drain port for discharging liquid to the outside of the casing is provided at a bottom of the casing.

[0008] In this configuration, when the gas-liquid two-phase flow is guided to the lower part in the casing through the introduction pipe and is ejected from the downward opening of the introduction pipe, the gas-liquid two-phase flow is swirled by the vortex generator to the inner surface of the peripheral wall of the casing. The liquid is guided into an annular cross-section flow path formed between the outer circumference of the introduction pipe and is converted into a vortex flowing in the flow path, and the droplet collides with the inner surface of the peripheral wall of the casing due to inertial force and centrifugal force. It adheres and then flows down to the bottom along the inner surface of the peripheral wall due to the action of gravity and accumulates. The liquid is discharged from the drain port to the outside of the casing, while the gas turns in the annular cross-sectional flow path, rises to the upper part in the casing, and is discharged to the outside of the casing from the exhaust port.

The introduction pipe extends from the upper surface of the casing to a lower part in the casing, and since the inflow direction of the gas-liquid two-phase flow introduced by the introduction pipe matches the direction of gravity, the gas-liquid two-phase flow is temporarily reduced. Even in the case of a stall, the gas-liquid two-phase flow in the inlet pipe flows out from the downward opening of the inlet pipe due to gravity, is guided by the vortex generator into the annular cross-section flow path, and is converted into a vortex flowing in the flow path. In other words, the droplet collides and adheres to the inner surface of the peripheral wall of the casing due to the centrifugal force. As a result, the separation efficiency can be maintained high despite the stall of the gas-liquid two-phase flow.

[0010] The invention according to claim 1 is the invention of the vortex generator.
A preferred embodiment is also provided. That is, the vortex generation body, and the umbrella member having a conical surface located on the downwardly opening coaxial with the inlet tube, the fins provided plurality in the circumferential direction at predetermined intervals on the conical surface of the umbrella member, A fixing member for fixing the umbrella member to the peripheral wall of the casing.
Further, each of the fins is placed on the vertex side of the conical surface of the umbrella member.
Spirally toward the hem side, and its cone
As the height on the surface goes from the top to the bottom of the conical surface
It is formed so as to be gradually higher. In this configuration, the gas-liquid two-phase flow ejected from the downward opening of the inlet pipe is changed from the axial direction to the radial direction by the conical surface of the umbrella member located coaxially with the downward opening, and the fins on the conical surface , And is smoothly and reliably converted into a swirling flow swirling in the annular cross-section flow path.

The inventions according to claims 2 and 3 both provide a preferable mode for further improving the separation efficiency. That is, the invention according to claim 2 has a configuration in which an exhaust pipe is provided at an upper portion in the casing through a peripheral wall thereof, and an exhaust port is provided on an upper side surface of the exhaust pipe facing the upper surface of the casing. In this configuration, the gas that has swirled in the annular cross-sectional flow path and has risen to the upper part in the casing, when being discharged from the exhaust port to the outside of the casing, once rises from below the exhaust pipe to above and then reverses. Since the liquid flows into the exhaust port on the upper side surface of the exhaust pipe, the liquid droplets collide with and adhere to the upper surface of the casing and the like during the reversal, and the separation efficiency is further increased.

The invention according to claim 3 is configured such that a shielding ring protruding from an inner surface of a peripheral wall is disposed at a central portion in the casing. In this configuration, the gas that rises while turning inside the annular cross-section flow path along the inner surface of the peripheral wall of the casing further rises beyond the shielding ring, while water droplets contained in the gas are blocked by the shielding ring and The shielding ring or the casing adheres to the inner surface of the peripheral wall and is separated, so that the separation efficiency is higher.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cyclone type gas-liquid separation device A according to an embodiment of the present invention. The gas-liquid separation device A includes a closed cylindrical casing 1 and a holding table 2 for holding the casing 1 in a vertical state. And the casing 1
For introducing a gas-liquid two-phase flow coaxially inserted into the casing 1 through the upper surface of the casing 1
And an exhaust pipe 4 provided at an upper portion of the casing 1 so as to penetrate a peripheral wall thereof.

The casing 1 has a substantially hollow hemispherical upper casing 1 at upper and lower ends of a cylindrical central casing 11.
2 and the lower casing 13 are joined to each other, and the exhaust pipe 4 penetrates through a portion of the central casing 11 close to the upper casing 12.
The exhaust pipe 4 penetrates through the center of the exhaust pipe. At the center of the lower casing 13, there is provided a drain port 15 for discharging the liquid accumulated at the bottom of the casing 1 (inside the lower casing 13) to the outside of the casing 1.

As shown in FIG. 2, the holding table 2 has a rectangular flat mounting plate 21 provided with mounting holes 21a at four corners, and the flange 22a faces each other on the mounting plate 21. It has a pair of angled columns 22, 22 erected in an upright state, and a pair of holding plates 23, 23, which are fixed between the right and left flanges 22 a, 22 a on the upper portions of the respective columns 22. The pair of holding plates 23 are opposed to each other across the casing 1 (specifically, the central casing 11) and are fixed to the casing 1, respectively.

The lower end of the introduction pipe 3 extends to a lower portion in the casing 1, and a gas-liquid two-phase flow is blown into the casing 1 through a downward opening 3a. In the casing 1, the gas-liquid two-phase flow spouted from the downward opening 3 a of the introduction pipe 3 flows through the annular cross-sectional flow path 30 formed between the inner peripheral surface of the casing 1 and the outer peripheral surface of the introduction pipe 3. A swirl generator 31 for converting into a swirling swirl is arranged facing the downward opening 3a.

As shown in FIG. 3, the vortex generator 31 includes an umbrella member 32 having a conical surface 32a located coaxially with the downward opening 3a of the introduction pipe 3, and a conical surface 32a of the umbrella member 32. Are provided at predetermined intervals in the circumferential direction (12 in FIG. 3), and a fixing member 3 for fixing the umbrella member 32 to the peripheral wall of the casing 1.
4 is provided. The umbrella member 32 includes the conical surface 32
A central member 36 that forms the central portion of a, and a flange member 37 that is fitted around the outer periphery of the central member 36 and that forms the peripheral portion of the conical surface 32a. Each of the fins 33 has a conical surface 32.
a is spirally curved from the apex side of a to the hem side, and is formed so that the height on the conical surface 32a gradually increases from the apex side of the conical surface 32a toward the hem side. . In addition, the fixing member 34 is attached to the umbrella member 32.
A ring member 38 coaxial with the flange member 37 and one end of which is fixed to the flange member 37, and four connecting members 39, 3 connecting the ring member 38 and the peripheral wall of the casing 1 at intervals of 90 degrees in the circumferential direction.
9, ...

The distal end of the exhaust pipe 4 is inserted up to the vicinity of the introduction pipe 3 in the casing 1. The upper side of the exhaust pipe 4, that is, the side opposite to the upper surface of the casing 1, as shown in FIG. An exhaust port 41 for discharging gas out of the casing 1 is provided.

Further, a shielding ring 42 is disposed in a central portion of the casing 1, that is, between the downward opening 3 a of the introduction pipe 3 and the exhaust pipe 4.
The casing 1 is mounted on the inner surface of the peripheral wall so as to protrude by a predetermined dimension from the inner surface of the peripheral wall over the entire inner surface of the peripheral wall. still,
Reference numeral 45 denotes a wrap-around preventing base mounted around the lower end of the introduction tube 3, that is, around the downward opening 3.

Next, the operation of the gas-liquid separation device A will be described. When a gas-liquid two-phase flow is guided to the lower part in the casing 1 through the introduction pipe 3 and is ejected from the downward opening 3a of the introduction pipe 3, The gas-liquid two-phase flow is guided by the vortex generator 31 to the annular cross-sectional flow path 30 between the inner surface of the peripheral wall of the casing 1 and the outer peripheral surface of the introduction pipe 3, and is converted into a vortex flowing in the flow path 30. The droplets are formed by the inertia force and the centrifugal force on the casing 1.
Collides with and adheres to the inner surface of the peripheral wall, and then flows down to the bottom along the inner surface of the peripheral wall due to the action of gravity. The liquid is discharged from the drain port 15 to the outside of the casing 1, while the gas swirls in the annular cross-sectional flow path 30 to rise to the upper part in the casing 1 and is discharged to the outside of the casing 1 from the exhaust port 41. .

In this case, the introduction pipe 3 extends from the upper surface of the casing 1 to a lower part in the casing 1, and the inflow direction of the gas-liquid two-phase flow introduced by the introduction pipe 3 matches the direction of gravity. Even when the gas-liquid two-phase flow stalls temporarily, the gas-liquid two-phase flow in the introduction pipe 3 flows out of the downward opening 3a of the introduction pipe 3 by gravity, and is guided to the annular cross-sectional flow path 3 by the vortex generator 31. The liquid is converted into a vortex that swirls in the flow path 30, and the liquid droplets are separated by the centrifugal force into the casing 1.
Collides with and adheres to the inner surface of the peripheral wall. As a result, the separation efficiency can be maintained high despite the stall of the gas-liquid two-phase flow.

In addition, the vortex generator 31 is connected to the introduction pipe 3.
Umbrella member 32 having a conical surface 32a located on the same axis as the downward opening 3a, and a plurality of umbrella members 32 provided on the conical surface 32a of the umbrella member 32 at predetermined intervals in a circumferential direction and each being a vertex of the conical surface 32a. It is a simple one comprising a fin 33 spirally curved from the side to the hem side and a fixing member 34 for fixing the umbrella member 32 to the peripheral wall of the casing 1. The jetted gas-liquid two-phase flow is changed from the axial direction to the radial direction by the conical surface 32a of the umbrella member 32, and generates a swirling motion along the fins 33 on the conical surface 32a.
Since it is smoothly and surely converted into a vortex that swirls inside 0, implementation can be easily achieved in terms of cost and the like.

Furthermore, in the above embodiment, the gas that rises while turning inside the annular cross-section flow path 30 along the inner surface of the peripheral wall of the casing 1 further rises beyond the shielding ring 42, and is included in the gas. Since the water droplets are blocked by the shielding ring 42 and adhere to the shielding ring 42 or the inner surface of the peripheral wall of the casing 1 and separated, the separation efficiency can be further improved. Further, when the gas that has risen to the upper portion in the casing 1 is discharged from the exhaust port 41 to the outside of the casing 1, the gas once rises above the lower portion of the exhaust pipe 4, then reverses, and turns over the upper side surface of the exhaust pipe 4. The liquid flows into the exhaust port 41, and at the time of this reversal, the droplet collides with and adheres to the upper surface of the casing 1 or the like. As a result, the droplets are discharged together with the gas into the exhaust port 4.
1 can be prevented as much as possible, and the separation efficiency can be further improved.

FIG. 5 shows experimental results obtained by continuously measuring the separation efficiency using the cyclone-type gas-liquid separator of the above embodiment and the conventional demister-type gas-liquid separator. In this figure, the solid line A represents the embodiment. The measurement result of the cyclone-type gas-liquid separator is shown, and the broken line B shows the measurement result of the conventional demister-type gas-liquid separator. In this experiment, the atmosphere was compressed by a reciprocating compressor to liquefy moisture in the atmosphere, and the air containing the liquefied water droplets was separated by each gas-liquid separator. As can be seen from the experimental results, in the cyclone-type gas-liquid separator of the embodiment, the separation efficiency is substantially constant during the elapsed time and about 100% even though the air inflow from the reciprocating compressor changes every moment. % Can be secured.

[0025]

As described above, according to the cyclone type gas-liquid separation device of the present invention, the introduction pipe extends from the upper surface of the casing to the lower part in the casing, and the gas-liquid two-phase flow introduced by the introduction pipe is provided. Since the inflow direction of
Even when the gas-liquid two-phase flow stalls temporarily, the gas-liquid two-phase flow in the inlet pipe flows out of the downward opening of the inlet pipe due to gravity, and is guided by the vortex generator to the annular cross-section flow path, and The droplets are converted into swirling vortices, and the droplets collide with and adhere to the inner surface of the peripheral wall of the casing due to centrifugal force, so that the separation efficiency can be kept high, and this is particularly effective when used in combination with a reciprocating compressor. .

In addition, the gas-liquid two-phase flow spouting from the downward opening of the inlet pipe can be smoothly and reliably converted into a vortex circling in the annular cross-section flow path by the vortex generator having a simple structure. It is effective in realizing the implementation.

In particular, in the invention according to the second aspect , the gas swirling in the annular cross-section flow path and rising to the upper part in the casing once rises from below the exhaust pipe to an upper part thereof, and then reverses and then reverses. The liquid flows into the exhaust port on the upper side of the casing, and at the time of the reversal, the droplet collides with and adheres to the upper surface of the casing or the like, so that the separation efficiency can be further improved.

According to the third aspect of the present invention, the gas that rises while swirling in the annular cross-section flow path along the inner surface of the peripheral wall of the casing further rises over the shielding ring, while water droplets contained in the gas are removed. Since the light is blocked by the shield ring and adhered to the inner surface of the shield ring or the peripheral wall of the casing and separated, the separation efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a cyclone type gas-liquid separator according to an embodiment of the present invention.

FIG. 2 is a plan view of a holding table which is one component of the gas-liquid separation device.

FIG. 3 is a plan view of the vortex generator.

FIG. 4 is an enlarged sectional view of the exhaust pipe taken along line XX of FIG. 1;

FIG. 5 is a diagram showing experimental results obtained by continuously measuring separation efficiency using the cyclone-type gas-liquid separator of the embodiment and a conventional demister-type gas-liquid separator.

FIG. 6 is a cross-sectional view showing a configuration of a conventional cyclone-type gas-liquid separator.

FIG. 7 is a sectional view taken along line YY of FIG. 6;

[Explanation of symbols]

 A Cyclone-type gas-liquid separator 1 casing 3 inlet pipe 3a downward opening 4 exhaust pipe 15 drain port 31 vortex generator 32 umbrella member 32a conical surface 33 fin 34 fixing member 41 exhaust port 42 shielding ring 43 gap

Claims (3)

(57) [Claims] 1. A closed cylindrical casing, and an inlet pipe which is coaxially disposed in the casing and penetrates the upper surface thereof, and guides the gas-liquid two-phase flow to a lower portion in the casing and ejects the gas-liquid two-phase flow from a downward opening. Is disposed in a fixed state facing the downward opening of the introduction pipe, and converts the gas-liquid two-phase flow ejected from the downward opening into a vortex swirling between the inner surface of the peripheral wall of the casing and the outer peripheral surface of the introduction pipe. and a vortex generator, an exhaust port in the upper portion of the casing for discharging a gas out of the casing, the bottom of the casing has drainage openings are provided respectively for discharging the liquid out of the casing, the vortex shedder Is located coaxially with the downward opening of the inlet tube.
An umbrella member having a conical surface to be placed on the conical surface of the umbrella member
A plurality of fins provided at predetermined intervals in the circumferential direction,
A fixing member for fixing the umbrella member to the peripheral wall of the casing
Rannahli, each fin toward the skirt side from the apex side of the conical surface of the umbrella member
Helical curve and the height above its conical surface
Gradually increases from the top to the bottom of the conical surface
A cyclone-type gas-liquid separation device characterized by being formed so that 2. A peripheral wall is provided on an upper portion in the casing.
An exhaust pipe is provided therethrough, and on the casing of this exhaust pipe
The cyclone type gas-liquid separation device according to claim 1 , wherein an exhaust port is provided on an upper side surface facing the surface . 3. A peripheral wall is provided at a central portion in the casing.
The shielding ring protruding from the inner surface is disposed.
Or the cyclone-type gas-liquid separator according to 2.