JP2006142252A - Gas-liquid separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-liquid separator which enables a separation of a liquid contained in a gas at a high efficiency even if it is of small volume. <P>SOLUTION: The gas-liquid separator (11) is provided with a constitution which has a chamber where the gas flows (33A) and a chamber where a liquid is pooled (33B), separates the liquid contained in the gas in the chamber where the gas flows (33A), and introduces the separated liquid into the chamber where the liquid is pooled (33B). In the chamber where the gas flows (33A), a passage leading from an introduction (32) of the gas to an outlet part (26) of the gas is formed by a plurality of bends, a section area of the passage in the bends is formed widely downstream, and at the downstream side of the bends, a liquid dropping-through hole (51) leading the separated liquid to the chamber where the liquid is pooled (33B) is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gas-liquid separation device that separates a liquid contained in a gas, and more particularly, to a gas-liquid separation device having a high separation performance even in a small volume.

  5A and 5B show a conventional gas-liquid separation device, in which FIG. 5A is a top view, FIG. 5B is a vertical cross-sectional view of bb, and FIG. 5C is a perspective view of a partition plate as a component. In the conventional gas-liquid separation device 100, the cylindrical portion 110a, the top plate portion 110b, and the bottom portion 110c have an inlet pipe 111 for introducing a gas containing liquid, and the introduced gas circulates in the cylindrical portion 110a in a circulating manner. , An outlet pipe 112 for leading to the outside, a drain pipe 113 for discharging a liquid substance formed by separating the contained liquid from the gas and accumulating in the lower part, and this accumulated liquid substance being re-vaporized by being absorbed in the air flow. And a partition plate 114 for preventing this.

  And the gas containing the liquid introduced from the inlet pipe 111 grows while the contained droplet collides with the inner wall surface by centrifugal force while rotating on the inner wall surface of the cylindrical portion 110a in the circumferential direction. Further, when the grown droplet reaches a predetermined size or more, it drops in the vertical direction due to gravity, passes through the notch 114a, and is accumulated in the bottom 110c. Or the gas which collided with the inner wall surface is cooled below the dew point by the cylindrical part 110a, and the vapor | steam contained may adhere to this inner wall surface by dew condensation.

In this way, the gas introduced into the gas-liquid separation device 100 is separated from the liquid while flowing in the circumferential direction along the trajectory indicated by the arrow B in the figure, and finally, the gas is separated from the outlet pipe 112 to the outside. Will be derived. The separated liquid flows in the direction of arrow A in the figure and accumulates in the bottom 110c, and is then discharged from the drain pipe 113 to the outside (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-1033 (paragraphs 0011 to 0016, FIG. 1)

  However, in the conventional gas-liquid separator 100, since the flow path is not defined inside the cylindrical portion 110a, the gas may go straight to the outlet pipe 112 by the shortest route immediately after the introduction, and the liquid contained therein The separation from the outlet pipe 112 with poor separation was inefficient. In such a conventional gas-liquid separator 100, in order to improve the separation of the liquid contained in the gas, it is necessary to increase the internal volume.

By the way, in a fuel cell vehicle that obtains power generation by electrochemically reacting fuel gas (hydrogen) and oxygen (air), the water generated during the electrochemical reaction is the cyclically supplied fuel gas (hydrogen). It enters the circulation path and makes the power generation characteristics unstable. For this reason, it is necessary to attach an apparatus for separating and discharging water from the fuel gas (hydrogen) circulation path to the circulation path.
However, when the above-described conventional gas-liquid separation device 100 is attached to obtain a desired separation efficiency, it is inevitable that the volume is increased, and the layout of element parts in a limited vehicle interior space is restricted, which causes a problem.
Therefore, the present invention has an object to solve such a problem, and provides a gas-liquid separation device capable of separating and discharging a liquid such as moisture contained in a gas with high efficiency even in a small volume.

In the present invention, the following configuration is provided as means for solving the above-described problems. That is,
The invention according to claim 1 has a configuration in which a gas flow chamber is provided, a liquid contained in the gas is separated in the gas flow chamber, and the separated liquid is discharged from the gas flow chamber. In the apparatus, in the chamber in which the gas flows, a flow path for gas-liquid separation that leads from the gas introduction part to the gas lead-out part is formed by a plurality of curved paths. A hole for discharging the liquid is formed.

  With such a configuration, the gas introduced from the introduction portion flows while bending along the curved path and is led out from the lead-out portion. At this time, a large centrifugal force is applied to the droplets in the gas through the curved path, and the separation is promoted. For this reason, even if the contained liquid droplet is fine, it can collide with the partition wall of the flow path which has become a curved path, and can be separated from the gas. Further, since the hole for discharging the separated liquid is formed in a portion where the flow rate of the gas is reduced, for example, it is prevented that the liquid once discharged is sucked up from the hole by a large negative pressure.

The invention according to claim 2 is the gas-liquid separation device according to claim 1, wherein the flow path includes a small flow path portion and a large flow path having a small cross-sectional area downstream of the small flow path portion. It has the part.
With such a configuration, it is possible to increase the flow rate of gas in the small flow path portion, adhere more liquid, and quickly drop the liquid in the large flow path portion.

The invention according to claim 3 is the gas-liquid separation device according to claim 1 or 2, wherein the cross-sectional area of the flow path in the vicinity of the gas introduction part is that of the gas lead-out part of the flow path. It is smaller than the cross-sectional area in the vicinity.
With such a configuration, in the introduction part, the flow rate is increased to promote the adhesion of the liquid to the partition wall, and in the lead-out part, the liquid is prevented from being rolled up from the hole due to the negative pressure.

According to a fourth aspect of the present invention, in the gas-liquid separation device according to any one of the first to third aspects, the hole is provided with a guide member having an opening surface that intersects with the gas flow direction. It is characterized by being.
In such a configuration, the liquid is prevented from being rolled up from the hole.

  ADVANTAGE OF THE INVENTION According to this invention, even if the volume is small, the gas-liquid separation apparatus which can introduce | transduce the gas containing a liquid, and can isolate | separate and remove this liquid with high efficiency is provided. Moreover, if such a gas-liquid separator is installed in the fuel gas (hydrogen) circulation path of a fuel cell vehicle, the stability of power generation characteristics is improved and the layout of the component parts in the vehicle is restricted. Is alleviated.

Hereinafter, a gas-liquid separator according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a gas-liquid separator according to an embodiment.
FIG. 2A is a top sectional view of the gas-liquid separation device according to the embodiment, and FIG. 2B is an XX longitudinal sectional view.
FIG. 3 is a perspective view showing details of the guide member.
FIG. 4 is a block diagram of a fuel gas supply system for a fuel cell vehicle showing an application example of the gas-liquid separator according to the embodiment.

As shown in FIG. 1, in the gas-liquid separation device 11 of the present embodiment, an outer surface is formed by the upper surface member 20, the first side frame member 30 </ b> A, the partition member 50, the second side frame member 30 </ b> B, and the bottom surface member 40. . Furthermore, the internal space 33 which shows airtightness is formed of these members. The internal space 33 is partitioned into two spaces by a partition member 50. Among these, a room on the upper side in the vertical direction in which gas flows is referred to as a gas-liquid separation chamber 33A, and the liquid is stored on the lower side. The room will be referred to as a liquid reservoir 33B.
The gas-liquid separation chamber 33A is provided with a lead-out portion 26 and an introduction portion 32, and the liquid reservoir chamber 33B is provided with a discharge portion 41, which communicates with the outside so that the airtight state of these spaces can be released. Yes. Further, the gas-liquid separation chamber 33A is provided with a first partition wall 21, a second partition wall 22, a third partition wall 23, a side-by-side partition wall 24, and a guide partition wall 25, and the gas flows through the flow path formed by these. The contained liquid is separated and collected and accumulated in the liquid reservoir 33B.

The introduction part 32 is provided on the side surface of the side frame member 30 so that the internal space 33 and the outside communicate with each other, and introduces a gas containing a liquid.
The lead-out portion 26 is provided on the upper surface member 20 so that the internal space 33 communicates with the outside. And the gas introduced from the introduction part 32 is a flow path for gas-liquid separation, that is, the input flow path R, the first corner flow path S, the second corner flow path T, and the third corner flow shown in FIG. The flow is derived after flowing in the order of the path U, the fourth corner flow path V, and the output flow path W (hereinafter sometimes simply referred to as “curved path”). By the way, in this embodiment, the derivation | leading-out part 26 is opened in the direction opposite to gravity, and the return member 26a (refer FIG. 1) which protruded in the inner space 33 side is provided around this opening.
The return member 26 a blocks the liquid that has been scooped up through the upper surface member 20 (the liquid that is about to scoop up) so that it is not led out from the lead-out portion 26.
The discharge part 41 is provided in the liquid storage chamber 33B, separates from the gas flowing in the flow path, and discharges the liquid accumulated in the liquid storage chamber 33B to the outside.

The partition member 50 partitions the gas-liquid separation chamber 33A and the liquid reservoir chamber 33B, and has a plurality of liquid drop holes (holes) 51, 51... Communicating the gas-liquid separation chamber 33A and the liquid reservoir chamber 33B. ing. It should be noted that the function of the liquid drop hole 51 is demonstrated if at least one of the liquid drop holes 51 is present. The first partition wall 21, the second partition wall 22, the third partition wall 23, the side-by-side partition wall 24, and the guide partition wall 25 (hereinafter may be simply referred to as “partition walls”) are integrally formed on the upper surface of the partition member 50. As a result, the gas-liquid separation chamber 33A is separated by these, thereby forming a flow path as shown in FIG.
By the way, the part in which these partition walls are formed is not limited to the upper surface of such a partition member 50, but other inner side surfaces 31 (for example, the upper surface member 20 and the first side frame member 30A of the internal space 33). It may be formed on the inner surface 31).

  The packing member 52 is provided at the tip of the first partition wall 21, the second partition wall 22, the third partition wall 23, and the side-by-side partition wall 24 opposite to the side formed integrally with the partition member 50. By these packing members 52, there is no gap between the partition wall and the upper surface member 20, and the shortcut phenomenon in which the gas flows between the adjacent flow paths through this gap is eliminated. For this reason, the introduced gas flows in a predetermined regular flow path, and the separation efficiency of the liquid contained in the gas is improved. The packing member 52 may not be used.

  As shown in FIG. 1, the first partition wall 21 extends from the inner surface 31 (the inner surface of the upper surface member 20 and the side frame member 30) of the internal space 33 sandwiched between the introduction portion 32 and the lead-out portion 26. . And the 1st front-end | tip (front-end | tip) 21a which is the opposite end of the base end 21b in which this 1st partition 21 contact | connects the side frame member 30 is on the inner surface 31 (inner side surface of the side frame member 30) of the opposing internal space 33. On the other hand, there is a gap. Due to this gap, a fourth corner channel V shown in FIG. 2A is formed. The first partition 21 causes the internal space 33 to be connected to the output flow path W and other spaces (first, second, third, and fourth corner flow paths S, T, U, V, and It is separated by a flow path R).

The fourth corner channel V is formed by the first tip 21a, the inner surface 31 of the side frame member 30, and the third partition wall 23, and the maximum channel width d ₈ is the end of the third corner channel U. and it is configured larger than the channel width d _7. Here, the magnitude relation of the flow width d (in this case when the part is not specified) is directly related to the magnitude relation of the cross-sectional area of the flow path, considering that the width in the height direction of the flow path is the same. Corresponding. In other words, a large flow path width means that the flow path is configured to have a large cross-sectional area, and a small flow path width means that the flow path is configured to have a small cross-sectional area at that position. It will be.
Therefore, in the curved path in the fourth corner channel V, a portion having a large cross-sectional area is formed after a portion having a small cross-sectional area. For this reason, the gas that has flowed through the third corner flow path U and entered the fourth corner flow path V is guided to the output flow path W by reversing the course to an acute angle while spreading in a wide portion of the cross-sectional area. become.

  As shown in FIG. 1, the second partition wall 22 branches and extends from the middle of the first partition wall 21, and the inner side surface 31 (inside of the side frame member 30) of the internal space 33 facing the second tip (tip) 22 a. Side) and a gap. Due to this gap, a second corner channel T shown in FIG. 2A is formed. Further, the second partition wall 22 includes a space other than the output channel W separated by the first partition wall 21, an input channel R communicating with the introduction portion 32, and the first, second, and third corner channels S, Separated into a space including T and U.

In the first corner channel S formed in this way, the channel width is defined by the second partition wall 22 provided with a bend 22b in the middle and the guide partition wall 25. The first corner channel S is formed so that the channel width d ₂ of the bent portion 22b is smaller than the channel widths d ₁ and d ₃ of the end portions. For this reason, the first corner channel S has a configuration in which the cross-sectional area is narrow at the bent portion 22b and the path has a curvature. By having such a configuration, the gas flowing in the first corner flow path S is strongly pressed against the wall surface of the flow path at the bent 22b portion as the flow velocity increases.

  The side-by-side partition wall 24 is provided in the flow path having the curvature of the first corner flow path S along the gas flow direction. Due to the presence of such side-by-side partition walls 24, the gas flowing through this portion is rectified and contributes to reducing the flow resistance of the gas. Furthermore, since the contact area with gas improves, the effect which improves the removal effect of the liquid contained in gas is also exhibited.

The second corner channel T is formed by the second tip 22a, the inner side surface 31 of the side frame member 30, and the third partition wall 23. The maximum channel width d ₄ is the end of the first corner channel S. and it is configured larger than the channel width d _3.
Therefore, the second corner channel T has a portion having a wider cross-sectional area than the end of the first corner channel S. The gas that has flowed through the first corner flow path S and entered the second corner flow path T spreads and is guided to the third corner flow path U by reversing the course to an acute angle.

The third partition wall 23 extends from the inner surface 31 in the internal space 33 sandwiched between the first tip 21 a and the second tip 22 a, and forms a third corner flow path U between the second partition wall 22. . The third corner flow path U is channel width d ₆ of the bent 22b portion is formed to be larger than the channel width d _5, d ₇ of the distal portion.
Therefore, the third corner channel U is configured such that a portion with a large cross-sectional area is formed after a portion with a small cross-sectional area at the end of the second corner channel T. The gas that has flowed through the second corner channel T and entered the third corner channel U spreads and is guided to the fourth corner channel V by reversing the course to an acute angle.

  The liquid dropping holes 51, 51... Are arranged in a portion away from the lead-out portion 26 with respect to an arbitrary straight line Y that intersects the first partition 21, the second partition 22, and the third partition 23. The first corner flow path S and the output flow path W are inclined with respect to the surface formed by the plurality of liquid drop holes 51 so as to descend toward the liquid drop holes 51 (see FIG. 1). )have. By forming such an inclined surface 50a, the liquid that has fallen onto these flow paths is guided to the liquid dropping holes 51, 51...

  2A, the guide member 54 is provided in the liquid drop hole 51 provided on the most downstream side of the flowing gas among the plurality of liquid drop holes 51, 51. And the guide member 54 has the opening surface 53 which cross | intersects the direction where gas flows, as shown in FIG. Due to the presence of such a guide member 54, the liquid accumulated on the surface of the flow path is surely captured even if it is pushed by the wind pressure of the flowing gas and blown away. Further, since the opening surface 53 of the guide member 54 receives a large wind pressure, the liquid once entering the liquid storage chamber 33B flows backward and rises up from the liquid drop hole 51 located on the most downstream side. To prevent.

(Description of operation)
Next, with reference to FIG. 2, operation | movement description of the gas-liquid separation apparatus concerning this embodiment is performed.
First, a gas containing a liquid is introduced from the introduction part 32 into the input flow path R and flows along the first corner flow path S. In addition, the gas containing the liquid indicates a state in which a droplet in which the liquid is in a fine mist state floats and the vapor in which the liquid is vaporized is saturated.
First, a gas containing a liquid enters from the introduction part 32 and enters the first corner channel S from the input channel R. Since the first corner channel S is partitioned by the side wall 24, the flowing gas is rectified and the pressure loss is reduced. Further, since the first corner flow path S has a curvature, the flowing gas is pressed against the side-by-side partition wall 24 and the guide partition wall 25, and an inertial force is applied to the contained droplet, It hits against the partition wall 24 and the guide partition wall 25 and adheres to separate from the gas.

  The gas that has passed through the first corner channel S then enters the second corner channel T, which is a small channel part in the present invention. Since the gas is bent at an acute angle in the second corner channel T, a large centrifugal force is applied to the contained droplets, and they are struck against and adhered to the wall surface. Furthermore, since the cross-sectional area of the flow path is widened on the downstream side (exit side) of the second corner flow path T, which is the large flow path portion in the present invention, the flow velocity is reduced, and the liquid droplets settle due to gravity. As a result, the liquid droplets contained in the gas are separated.

  The gas that has passed through the second corner channel T then enters the third corner channel U. Also in the third corner channel U, the gas is bent at an acute angle and spreads in the bent portion 22b, so that the liquid is further separated from the gas by the same mechanism (centrifugal force, gravity) as described above. It becomes. Furthermore, since the cross-sectional area of the flow path has a configuration that expands toward the downstream, the flow velocity of the gas decreases, and the effect that the liquid drops from the air flow due to gravity and gas-liquid separation increases. .

The gas that has passed through the third corner flow path U then enters the fourth corner flow path V. Also in the fourth corner channel V, the gas is bent when the traveling direction is bent at an acute angle and the cross-sectional area is increased. For this reason, the liquid is further separated from the gas by the same mechanism as described above.
The gas that has passed through the fourth corner flow path V then enters the output flow path W, proceeds straight, and is led out from the lead-out portion 26.

In addition, the cross-sectional area of the flow path in the curved path is widely formed on the downstream side, so that the gas that has entered the wide portion may expand adiabatically. The gas adiabatically expanded in this manner drops in temperature, and this drop in temperature condenses the vaporized (vaporized) liquid from the saturated vaporized gas. The condensed liquid is absorbed by droplets floating in the gas, and the droplets are enlarged. This enlarged droplet is applied with a very large centrifugal force at a portion where the radius of curvature of the flow path is small, so that it easily adheres to the wall surface of the flow path and further promotes liquid separation. .
In addition, the downstream side of the second, third, and fourth corner channels T, U, and V (downstream side of the curved path) is a portion where the gas flow velocity decreases (portion where the negative pressure decreases). By providing the liquid drop hole 51 in the portion, the suction of water due to negative pressure is suppressed.

On the other hand, when the droplets adhering to the wall surface of the flow path merge and become large, they drop in the direction of gravity and reach the upper surface of the partition member 50 shown in FIG. Of these liquids that have reached the upper surface, the liquid that has reached the slope 50a moves along the fall line that is the maximum slope line. Furthermore, as the liquid is covered with the flowing gas and moves on the upper surface of the partition member 50, the liquid fits into the opening of one of the liquid dropping holes 51 and falls into the liquid reservoir 33B. Further, since the guide member 54 is provided in the most downstream liquid drop hole 51, the liquid that has penetrated the liquid drop hole 51 in the upstream part finally becomes in the most downstream liquid drop hole 51. There is a high probability of being captured.
The liquid that has fallen in this manner and accumulated in the liquid storage chamber 33B is discharged to the outside under the pressure of the gas to be introduced by opening an open / close valve (not shown) provided in the discharge unit 41 at an appropriate time. Will be.

  When the gas is introduced into the gas-liquid separation device 11 in this way, the gas is applied to the wall surface of the flow path by applying a large centrifugal force at the curvature portion of the flow path in the first half of the flow path. In the latter half of the process, the rate of drop of the droplet due to gravity increases as the gas flow velocity decreases. In this manner, the gas-liquid separation device 11 according to the present invention can separate the liquid with high efficiency and derive the gas.

(Application example of gas-liquid separator)
With reference to FIG. 4, the application example of the gas-liquid separation apparatus 11 which concerns on 1st Embodiment is demonstrated.
The fuel gas supply system for the fuel cell vehicle shown in FIG. 4 includes a hydrogen tank 1, an ejector 2, a fuel cell 3, an air exhaust unit 7, a check valve 8, a compressor 9, and a gas-liquid separator 11. And the opening / closing valve 60.

The hydrogen tank 1 is filled with high-pressure hydrogen gas, and supplies hydrogen to the ejector 2.
The ejector 2 mixes a fuel off-gas sent from a check valve 8 to be described later and a hydrogen gas supplied from the hydrogen tank 1, and uses the mixed gas as a fuel gas for the fuel electrode (the left side of the fuel cell 3). : Pump not shown).
Part of the fuel gas supplied to the fuel cell 3 is used for power generation, and the remainder is sent to the gas-liquid separator 11 as fuel off-gas. This fuel off-gas contains a large amount of heat and moisture generated by the reaction between hydrogen and oxygen during power generation (what is generated at the cathode electrode has moved through the electrolyte membrane), and is hot and humid. Have a state.

In the gas-liquid separator 11 into which such fuel off-gas has flowed, the contained liquid (droplets) is removed according to the above-described operation. The liquid thus removed is discharged to the outside when the opening / closing valve 60 operates in a timely manner.
The fuel off-gas dehumidified by the gas-liquid separator 11 is sent again to the ejector 2 via the check valve 8. The check valve 8 is a valve that allows gas to flow in the direction from the gas-liquid separator 11 to the ejector 2 but does not allow gas to flow in the opposite direction.

The compressor 9 takes in an appropriate amount of external air containing oxygen and supplies it to the air electrode of the fuel cell 3 (right side of the fuel cell 3: not shown).
The air exhaust unit 7 is taken in from the outside by the compressor 9 and discharges air used in the fuel cell 3.

  As described above, in the fuel gas supply system for a fuel cell vehicle to which the present invention is applied, the moisture mixed in the circulating fuel off-gas in the process of power generation is removed by the gas-liquid separator 11 disposed in the middle of the circulation path. It is possible to discharge with high efficiency. Moreover, since the gas-liquid separator 11 has a small volume, it does not limit the degree of freedom of the complicated design layout of the fuel cell vehicle. Furthermore, since it is not necessary to discharge the separated liquid frequently, the use of hydrogen as a fuel can be saved.

In the above description, the gas is a gas mainly composed of hydrogen gas when used in a fuel cell vehicle, but is not particularly limited and can be applied to air or the like. In addition, the liquid contained in the gas is mainly water when used in a fuel cell vehicle, but is not particularly limited and can be applied to an organic solvent or the like. Furthermore, the state of the liquid may be a droplet (mist) that is miniaturized and floats in the gas. In addition to the fuel cell vehicle, the present invention may be applied to ships and other moving objects.
In the present invention, the flow path is formed by partition walls (first, second, third partition walls 21, 22, 23, etc.) provided on the partition member 50. It may be provided on a member (for example, the upper surface member 20, the first side frame member 30A, etc.). Further, in the present invention, the ejector 2 is installed to circulate hydrogen gas, but a pump may be used.

It is a disassembled perspective view of the gas-liquid separator which concerns on this embodiment. (A) is a top sectional view of a gas-liquid separation device concerning this embodiment, and (b) is an XX longitudinal section. It is a perspective view which shows the detail of a guide member. 1 is a block diagram of a fuel gas supply system for a fuel cell vehicle, showing an application example of a gas-liquid separator according to the present embodiment. It is the conventional gas-liquid separator, (a) Top view, (b) bb longitudinal cross-sectional view, (c) The perspective view of the partition plate which is a component.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Gas-liquid separator 21 1st partition 21a 1st front-end 22 2nd partition 22a 2nd front-end 22b Bending 23 3rd partition 24 Parallel partition 26 Lead-out part 26a Return member 31 Inner side surface 32 Introduction part 33 Internal space 33A Gas-liquid separation Chamber (room where gas flows)
33B Liquid reservoir (room where liquid is stored)
41 Discharge part 50 Partition member 50a Slope 51 Liquid drop hole (hole)
53 Opening surface R Input channel S First corner channel (curved path)
T Second corner channel (curved path)
U Third corner channel (curved path)
V Fourth corner channel (curved path)
W Output flow path

Claims (4)

In a gas-liquid separation device comprising a chamber through which gas flows, a liquid contained in the gas is separated in the room through which the gas flows, and the separated liquid is discharged from the room through which the gas flows.
In the room through which the gas flows, a flow path for gas-liquid separation that leads from the gas inlet to the gas outlet is formed by a plurality of curved paths,
A gas-liquid separation device, wherein a hole for discharging the separated liquid is formed on the downstream side of the curved path.   The gas-liquid separation device according to claim 1, wherein the flow path includes a small flow path section and a large flow path section having a small cross-sectional area of the flow path on the downstream side of the small flow path section.   3. The gas-liquid according to claim 1, wherein a cross-sectional area of the flow path in the vicinity of the gas introduction portion is smaller than a cross-sectional area of the flow path in the vicinity of the gas introduction portion. Separation device.   The gas-liquid separation device according to any one of claims 1 to 3, wherein a guide member having an opening surface that intersects with a direction in which gas flows is formed in the hole.

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