JP2009119425A - Gas/liquid separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas/liquid separator with a simple structure capable of efficiently separating a gas/liquid two-phase flow into a gas and a liquid. <P>SOLUTION: The gas/liquid separator 10 for separating the gas/liquid two-phase flow 4 to the gas 3 and the liquid 2 is provided with a vessel 12 comprising a hollow cylindrical body part; a two-phase flow feeding pipe 13 for feeding the gas/liquid two-phase flow to the body part 12c of the vessel in a tangent direction; a gas delivery pipe 14 for delivering the gas from an apex part 12; and a liquid delivery pipe 15 for delivering the liquid from the vessel. The gas/liquid separator 10 is provided with a first baffle plate 16 for partitioning the body part to upper and lower parts and having an opening 16a at a center below the two-phase flow feeding pipe 13. An inlet of the liquid delivery pipe 15 is opened in a lateral direction below the first baffle plate 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas-liquid separator, and more particularly, to a gas-liquid separator of a water jet type gas compressor.

The water-injection type gas compressor is, for example, a water-injection type screw compressor. By injecting water (circulated water) into the compression chamber and compressing it in the compression stroke, it is possible to achieve efficient compression close to isothermal compression. It is possible to lubricate and seal the rotor with the generated water, and to supply clean compressed gas that does not contain oil in the discharged gas (compressed air or the like).
Such a water injection type gas compressor is disclosed in Patent Document 1, for example. Moreover, the gas-liquid separation apparatus relevant to this invention is disclosed by patent document 2, for example.

The water injection type air compressor of Patent Document 1 can be operated continuously for a long time without replenishing water, reducing the impurity concentration of circulating water without using a deionizer or a water purification device. It can be kept clean for a long time, and the amount of bacteria in the circulating water can be reduced by suppressing the propagation of bacteria without exchanging the circulating water.
Therefore, as shown in FIG. 8, the water injection type air compressor includes a water tank 62 that holds water therein and a compressor 64 that compresses air, and directly supplies the compressed air into the water tank 62. In the water injection type air compressor for injecting water from the water tank 62 into the compressor at the pressure, the steam separator 65 installed in the water tank and the steam separator provided at the air outlet of the water tank. And a dehumidifier for condensing and separating the water by cooling the compressed air exiting the water tank 62 against the check valve 66 below the saturation temperature of the water. 67, and a moisture recovery line 68 that directly supplies the moisture separated by the dehumidifier 67 to the air intake port of the compressor together with air.

The steam-water separator of Patent Document 2 aims to suppress gas entrainment and improve separation performance.
Therefore, as shown in FIG. 9, this gas-water separator connects the gas-liquid two-phase flow inlet pipe 72 tangentially to the body 73 and rotates the gas-liquid two-phase flow flowing into the body. In an air / water separator that uses a centrifugal force to separate a gas-liquid two-phase flow into steam and water, an annular horizontal baffle plate 75 is provided on the inner wall of the body portion of the steam / water separator, and the horizontal baffle plate 75 is further provided. A plurality of rectangular vertical baffle plates 76 are provided radially on the inner wall of the body portion of the lower steam / water separator.

Patent No. 3008933, “Water-injection type air compressor and its water quality management method” Japanese Patent No. 3588891, "Steam separator"

In the apparatus of Patent Document 1, the compressed air compressed by the compressor 64 is supplied to the water tank 62 via the compressed air line, and the water is separated by the steam separator 65 in the water tank and mixed into the internal water. The compressed air from which moisture has been removed is discharged against the check valve 66.
However, the air-water separation by this configuration is incomplete, and there is a problem that water is mixed with the discharged compressed air and air is mixed with the water jetted from the water tank into the compressor.

In order to solve the above-described problems, it is conceivable to use, for example, the air / water separator of Patent Document 2 instead of the water tank 62 and the air / water separator 65 of Patent Document 1. Still remained.
That is, the amount of air contained in the water jetted from the water tank into the compressor is reduced by employing the air / water separator of Patent Document 2, but it is not perfect and the structure is complicated and the manufacturing cost is high. There was a problem.

  Furthermore, since air is mixed into the water injected into the compressor, (1) erosion due to bubble collision, (2) reduced efficiency due to circulating compressed air in the system, (3) occurrence of piping vibration due to bubbles. (4) There was a risk of insufficient cooling of the compressor or insufficient lubrication.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide a gas-liquid separation device that can efficiently separate a gas-liquid two-phase flow into gas and liquid and has a simple structure.

According to the present invention, a gas-liquid separation device that separates a gas-liquid two-phase flow into a gas and a liquid,
A container comprising a top portion, a bottom portion, and a hollow cylindrical body connecting the bottom portion;
A two-phase flow supply pipe for supplying the gas-liquid two-phase flow into the container in a tangential direction of the body portion;
A gas discharge pipe for discharging gas from the top;
A liquid discharge pipe for discharging liquid from the container,
A first baffle plate is provided below the two-phase flow supply pipe to partition the body part up and down and have an opening in the center.
An inlet of the liquid discharge pipe is opened laterally below the first baffle plate, and a gas-liquid separation device is provided.

Further, according to a preferred embodiment of the present invention, the two-phase flow supply pipe and the gas discharge pipe are partitioned, and the upper end is hermetically connected to the top of the container, and is downward from the highest liquid level to a predetermined height. It has a hollow inner tube that extends and has an open lower end,
A flow path in which a gas-liquid two-phase flow can turn horizontally is formed between the hollow inner tube and the body portion.

  According to a preferred embodiment of the present invention, the inlet and one end of the liquid discharge pipe communicate with each other, the other end opens downward from the bottom of the container with a predetermined height, and the first A liquid introduction pipe located outside the opening of the baffle plate is provided.

  Further, at least one second baffle plate fixed to the inner surface of the body part below the first baffle plate and extending in the vertical direction may be provided.

According to the configuration of the present invention, by providing the first baffle plate, it is possible to greatly reduce the downward propagation of the swirling motion remaining in the liquid centrifuged from the gas-liquid two-phase flow.
Therefore, below the first baffle plate, there is little swirling movement of the liquid, so that almost no vortex containing gas is generated, and bubbles in the liquid are separated by the difference in specific gravity. As a result, the amount of gas mixed into the separated liquid can be greatly reduced. Furthermore, since the first baffle plate has only an opening at the center, the structure is simple. Further, the suction vortex can be suppressed by opening the inlet of the liquid discharge pipe sideways.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is an overall configuration diagram of a water jet type gas compressor provided with a gas-liquid separation device of the present invention.
In this figure, the water-injection type gas compressor is a water-injection type screw compressor, but the present invention is not limited to this, and may be other devices that handle a gas-liquid two-phase flow consisting of a liquid and a gas. Good.

In FIG. 1, 10 is a gas-liquid separator of the present invention, 20 is a compressor body, 22 is an electric motor, 24 is a water cooler, and 26 is a dryer (dehumidifier).
The electric motor 22 rotationally drives the internal rotor of the compressor body 20 via the belt 23, introduces air 1 from the outside, and the compressed air compressed between the rotors passes through the compressed air line 31. To be supplied.

The gas-liquid separator 10 is provided with a water level gauge, a water supply valve, a water discharge valve, and the like (not shown), and water is always supplied to an intermediate position at a certain level. This amount is, for example, about 25 to 40 liters.
In addition, compressed air supplied from the compressor main body 20 is introduced into the upper part of the gas-liquid separator 10, and the inside is always held at a predetermined range of pressure (for example, about 0.7 MPa or more). With this pressure, during normal operation, the internal water is pumped to the water cooler 24 via the water line 32, where it is cooled by cooling water or the like.

Further, the water cooled by the water cooler 24 is supplied to the air intake port and the water supply port (not shown) of the compressor body 20 through the water line 33 by the air pressure in the gas-liquid separator 10. A nozzle (not shown) is provided at the junction of the water line 33 and the air intake and the water supply port, and an appropriate amount of water is supplied into the compressor body 20 while maintaining the pressure on the gas-liquid separator 10 side. It comes to inject.
This water injection amount wets and lubricates the interior of the compressor body 20, cools the interior to maintain the temperature within an appropriate range, and lowers the temperature of the compressed air, thereby increasing the compression efficiency of the compressor. Is set to

  Next, the water that has lubricated and cooled the inside of the compressor body 20 is circulated from the discharge port to the gas-liquid separator 10 through the compressed air line 31 together with the compressed air, separated inside, and mixed into the internal water inside. To do. The compressed air from which moisture has been removed is discharged against the check valve 11.

The compressed air discharged against the check valve 11 is supplied to the dryer 26 through the compressed air line 34, dehumidified here, and supplied to the facility (not shown) through the compressed air supply line 35.
The temperature of the compressed air that exits the gas-liquid separator 10 is, for example, about the outside air temperature + 20 ° C. and contains moisture. Therefore, in the dryer 26, the compressed air is once lowered below the saturation temperature of the moisture to condense and separate the moisture inside, and then reheated to return to the ambient temperature or higher.
Therefore, dry compressed air having almost no moisture can be supplied to equipment (not shown). The moisture recovery line 36 supplies the recovered moisture to the air suction side of the compressor body 20. With this configuration, moisture can be supplied into the compressor main body 20 without particularly applying pressure.

FIG. 2 is a first embodiment of the gas-liquid separation device according to the present invention, in which (A) is a longitudinal sectional view and (B) is a sectional view taken along line BB.
In this figure, the gas-liquid separation device 10 of the present invention comprises a gas-liquid two-phase flow 4 consisting of a liquid 2 (in this example, water) and a pressurized gas 3 (in this example, compressed air) as a pressurized gas 3 and a liquid 2. The gas-liquid separation device includes a container (vertical pressure container) 12, a two-phase flow supply pipe 13, a gas discharge pipe 14, a liquid discharge pipe 15, and a horizontal baffle plate 16 as a first baffle plate.

The vertical pressure vessel 12 is a hollow vessel that is elongated in the vertical direction and includes a top portion 12a, a bottom portion 12b, and a hollow cylindrical body portion 12c that is airtightly connected therebetween.
Moreover, in this example, the trunk | drum 12c is formed in the same diameter from the top part 12a to the bottom part 12b. In addition, this invention is not limited to this structure, An internal diameter may differ in the upper part and lower part of a trunk | drum.

  The two-phase flow supply pipe 13 is provided in the upper part of the trunk of the vertical pressure vessel 12 in the tangential direction of the trunk 12c so as to supply the gas-liquid two-phase flow 4 in the tangential direction in the upper part of the trunk. It has become. The two-phase flow supply pipe 13 is a single horizontal pipe in this example, but may be two or more or may be inclined downward with respect to the horizontal.

  The gas discharge pipe 14 is attached to the top part 12a of the vertical pressure vessel 12, and discharges the pressurized gas 3 from the top part 12a. In this example, the gas discharge pipe 14 is provided vertically at the center of the top, but may be offset from the center or provided obliquely. The gas discharge pipe 14 communicates with the check valve 11 described above.

  The liquid discharge pipe 15 is attached to the body portion 12c, and discharges the liquid 2 from the body portion 12c with an internal gas pressure. In this example, the liquid discharge pipe 15 is horizontally provided in the radial direction, but may be inclined in the circumferential direction or the vertical direction with respect to the body portion.

The horizontal baffle plate 16 horizontally partitions the body portion 12c of the vertical pressure vessel 12 below the lowest liquid level of the liquid 2 in the vertical pressure vessel 12, and has an opening 16a in the center.
In this example, the horizontal baffle plate 16 is a ring-shaped disc, and the outer peripheral portion thereof is fixed to the inner surface of the trunk portion by welding or the like.

In this example, the liquid discharge pipe 15 described above is directly attached to the body 12c below the horizontal baffle plate 16. The inner end face 15a is a substantially vertical surface, and the liquid 2 below the horizontal baffle plate 16 is introduced horizontally. It is supposed to be.
The inner end surface 15a of the liquid discharge pipe 15 is not limited to a vertical surface, and may be obliquely downward or completely downward.

  Further, by supplying a gas-liquid two-phase flow in the tangential direction into the upper part of the body of the vertical pressure vessel through the two-phase flow supply pipe 13, the gas-liquid two-phase flow 4 is swirled horizontally to generate a rotational centrifugal force. The gas-liquid two-phase flow 4 can be efficiently centrifuged into the gas 3 and the liquid 2, and the liquid mixed into the pressurized pressurized gas 3 can be greatly reduced.

Further, since the horizontal baffle plate 16 having an opening 16a in the center partitions the body portion 12c horizontally below the lowest liquid level of the liquid 2 in the vertical pressure vessel 12, it is centrifuged from the gas-liquid two-phase flow 4. Further, the downward propagation of the swirling motion remaining in the liquid 2 can be greatly reduced.
Therefore, below the horizontal baffle plate 16, since the swirling motion of the liquid 2 is small, the generation of vortices containing gas hardly occurs, and bubbles in the liquid are separated due to the specific gravity difference.

Further, since the horizontal baffle plate 16 is positioned below the lowest liquid level of the liquid 2 in the vertical pressure vessel 12 so as not to become a foreign object against the swirling flow of the gas-liquid two-phase flow 4, pressure loss ( Pressure loss) does not increase.
Accordingly, the liquid 2 is discharged from the liquid discharge pipe 15 whose inner end surface 15a communicates with the liquid 2 below the horizontal baffle plate 16 at the internal gas pressure, thereby discharging the swirling liquid portion and the vortex including the gas 3 Thus, the amount of gas mixed into the separated liquid 2 can be greatly reduced.

  Furthermore, since the horizontal baffle plate 16 has only the opening 16a in the center, the structure is simple.

  Further, by opening the inlet of the liquid discharge pipe 15 sideways, for example, the generation of the suction vortex of the liquid 2 can be suppressed as compared with the case where the bottom 12b is opened upward. Furthermore, by providing at a position separated from the central portion, it is possible to prevent air bubbles present in the central portion side of the vertical pressure vessel 12 from flowing into the inlet of the liquid discharge pipe 15. Note that the suction vortex and the inflow of bubbles can be suppressed by opening the inlet of the liquid discharge pipe 15 obliquely downward or downward.

FIG. 3 is a diagram showing a second embodiment of the gas-liquid separation device according to the present invention, in which (A) is a longitudinal sectional view and (B) is a sectional view taken along line BB.
In this figure, the gas-liquid separation device 10 of the present invention further includes a hollow inner tube 17 and a liquid introduction tube 18.

The hollow inner pipe 17 partitions the two-phase flow supply pipe 13 and the gas discharge pipe 14, and the upper end is hermetically connected to the top 12 a of the vertical pressure vessel, and extends downward from the highest liquid level to a predetermined height H. It extends and the lower end is open.
The hollow inner tube 17 is positioned concentrically with the upper portion of the body portion, and forms a flow path in which the gas-liquid two-phase flow 4 can turn horizontally.

The predetermined height H from the highest liquid level is set so that a strong swirl flow is formed outside the hollow inner tube 17 and the swirl flow is small on the inside of the hollow inner tube 17 and separation due to a specific gravity difference is promoted.
That is, in the state in which the gas-liquid two-phase flow 4 is horizontally swirled between the hollow inner tube 17 and the upper portion of the trunk to generate the rotational centrifugal force, the gas-liquid two-phase flow 4 is swung down while being swirled and hollow The lower end of the inner pipe 17 is reached, where the pressurized gas 3 having a small specific gravity is centrifuged inwardly from the gas-liquid two-phase flow 4 by centrifugal force and guided to the inside of the hollow inner pipe 17 and simultaneously the liquid 2 having a large specific gravity. The predetermined height H is preferably set to a sufficient distance (height) so as to be centrifuged outward and guided downward along the inner surface of the body portion.

  With this configuration, the gas-liquid two-phase flow 4 reaching the lower end of the hollow inner tube 17 can be efficiently centrifuged into the pressurized gas 3 and the liquid 2 by centrifugal force. Since the moisture is further separated from the pressurized gas 3 due to the difference in specific gravity in the process of rising to 14, the liquid mixed in the pressurized gas can be further reduced as compared with the first embodiment described above.

  One end of the liquid introduction pipe 18 communicates with the inner end surface 15a of the liquid discharge pipe 15, and the other end (lower end) opens downward from the bottom 12b of the vertical pressure vessel with a predetermined height. Furthermore, in this example, the liquid introduction pipe 18 is located outside the opening 16 a of the horizontal baffle plate 16.

  As described above, below the horizontal baffle plate 16, there is little swirling motion of the liquid, so that almost no vortex containing gas is generated, and bubbles in the liquid are separated by the difference in specific gravity. Further, in this configuration, the liquid below the horizontal baffle plate 16 is introduced into the liquid discharge pipe 15 upward from a position close to the bottom portion 12b, so that the liquid in the portion where bubbles are most eliminated due to the specific gravity difference is supplied from the liquid discharge pipe 15. The amount of gas that can be discharged and mixed into the separated liquid can be further reduced as compared with the first embodiment described above.

  Further, the liquid introduction pipe 18 has an effect as a turning restraint that restrains turning below the horizontal baffle plate 16 (an effect also serving as a turning restraining plate 19 described later). Therefore, by omitting the turning suppression plate 19 described later, there is an advantage that the structure of the tank is simplified.

  Other configurations and effects are the same as those of the first embodiment described above.

4A and 4B are views of a third embodiment of the gas-liquid separator according to the present invention, in which FIG. 4A is a longitudinal sectional view, and FIG. 4B is a sectional view taken along line BB.
In this figure, the gas-liquid separation device 10 of the present invention further includes a turning suppression plate 19 as a second baffle plate.

  You may provide the rotation suppression board 19 at least 1 sheet, Preferably 2 or more sheets. It is fixed to the inner surface of the body part below the horizontal baffle plate 16, extends in the vertical direction, and suppresses the horizontal turning of the liquid 2 below the horizontal baffle plate 16.

As described above, since the horizontal baffle plate 16 having the opening 16a in the center partitions the body portion horizontally below the lowest liquid level of the liquid in the vertical pressure vessel, it is centrifuged from the gas-liquid two-phase flow 4. Further, the downward propagation of the swirling motion remaining in the liquid 2 is greatly reduced. However, since a weak swirl motion is propagated through the central opening 16a, a vortex containing the gas 2 may be generated depending on the operating state.
However, by providing the swivel suppression plate 19, the swirl suppression plate 19 can further suppress the horizontal swirling of the liquid 2 below the horizontal baffle plate 16, so that the generation of vortices containing gas can be prevented, and the separated liquid The amount of gas mixed in can be further reduced as compared with the second embodiment described above.

  In addition, although the rotation suppression board 19 is not an essential structure, this can suppress rotation more effectively.

Other configurations and effects are the same as those of the second embodiment described above.
Examples of the present invention will be described below.

  The upper part of the conventional water tank shown in FIG. 8 is changed to the upper structure shown in FIGS. 2 and 3, so that the gas-liquid two-phase flow 4 is converted into a pressurized gas 3 (compressed air in this example) and a liquid 2 It was confirmed by a test using an actual water jet screw compressor that the water can be efficiently centrifuged (in this example, water) and the amount of water mixed in the compressed air that has been centrifuged can be greatly reduced.

However, in this test, the lower part of the water tank (that is, the vertical pressure vessel 12) has a conventional structure. As a result of observing the inside of the tank with a transparent observation window, the following phenomenon was observed.
(1) The inside of the tank is a large swirling flow. Also, it contains a large amount of bubbles and is a foam.
(2) When the water level in the tank is high, there are fewer bubbles below and the bubbles are reduced below a certain depth.
(3) A large tornado-like vortex reaching the water discharge pipe inlet is confirmed in the center of the tank, and this vortex is considered to be the main factor for the outflow of bubbles into the circulating water.

FIG. 5 is a schematic diagram of a solution for solving the above problem. In this figure, 50 is a water tank, 51 is a vertical baffle plate provided above the water surface, and 52 is a horizontal baffle plate provided below the water surface and horizontally above the water discharge pipe inlet.
The vertical baffle plate 51 can reduce the swirling flow generated inside the tank. Further, it is considered that the horizontal baffle plate 52 can prevent bubbles from flowing out to the water discharge pipe due to the tornado-like vortex generated in the center of the tank.

However, this solution was abandoned for the following reasons.
(1) When the vertical baffle plate 51 is provided above the water surface, the swirling flow of the gas-liquid two-phase flow 4 swirling into the tank is stopped, and the pressure loss increases. In addition, air and water swirl is strong above the surface of the water, so if there are obstacles, there is a risk that intense water splashes and water drops flow out of the machine. Further, when the swirl flow is stopped, the air and water cannot be centrifuged.
(2) When the horizontal baffle plate 52 is provided below the surface of the water, bubbles in the water are accumulated in the lower part of the horizontal baffle plate 52, and it is not possible to prevent the bubbles from flowing out into the circulating water.
Therefore, another solution was sought on the premise of a structure in which the swirling flow is stopped above the water surface, there is no baffle plate (such as a baffle plate) that causes an increase in pressure loss, and bubbles are not accumulated below the water surface.

FIG. 6 is a schematic diagram showing a test state using a transparent simulated tank. In this embodiment, a water outlet 54 is provided vertically at the center of the lower surface of a transparent container 53 having a volume of 1000 mL with an open top, and only water flows in from the top in a tangential direction, so that the internal water flow and vortex generation state Was visually observed.
6A shows a case where there is no bubble outflow prevention mechanism, FIG. 6B shows a case where a vertical baffle plate 55 is provided in four directions, and FIG. 6C shows a donut-shaped disc 56 having an opening in the center. When fixed in water, (D) is a case where both a vertical baffle plate (B) and a donut-shaped disc (C) are provided.

When there is no bubble outflow prevention mechanism shown in FIG. 6A, a large vortex is observed at the center, and it has been found that the actual flow in the tank can be reproduced.
In FIG. 6B, the turning is weakened by the four vertical baffle plates 55, but vertical vortices are generated by the vertical baffle plates 55, thereby generating bubbles in the water.
In FIG. 6 (C), it was observed that when there was a turning energy supply, no vortex was generated and the turning was weak under the disk. However, a swirl occurred when the swirling energy supply was lost and the water level dropped. Therefore, it was found that the disk alone was not a reliable measure.
In FIG. 6 (D), it turned out that turning is strong above the disk, but there is almost no turning below the disk.

From this embodiment, as shown in FIG. 6D, by providing both a vertical baffle plate and a donut-shaped disc, the swirl flow above the disc is prevented and the lower side of the disc is prevented. It turns out that turning can be greatly reduced.
Further, as shown in FIG. 6C, the same effect can be obtained by using only a donut-shaped disk, but in this case, a vortex is generated when the water level is lowered, and bubbles are discharged to the circulating water by the vortex. It was confirmed that there was a possibility.
Furthermore, the same phenomenon was confirmed even when the water outlet 54 was offset from the center of the lower surface.

FIG. 7 is a schematic diagram showing another test state using a transparent simulated tank. In this embodiment, a water outlet 54 is provided horizontally on the lower end side surface of a transparent container 53 having a volume of 1000 mL having an open top, and only water is allowed to flow in the tangential direction from the top so that the internal water flow and vortex are generated. Was visually observed.
7A shows a case where there is no bubble outflow prevention mechanism, FIG. 7B shows a case where one vertical baffle plate 55 is provided, and FIG. 7C shows a donut-shaped disc 56 having an opening in the center. (D) is a case where both the vertical baffle plate of (B) and the donut-shaped disc of (C) are provided.

In the case where there is no bubble outflow prevention mechanism shown in FIG. 7A, the water outlet 54 is on the side of the lower end, so no vortex is generated, but the swirl flow is not weakened. It turns out that there is a possibility to do.
In FIG. 7B, no vortex is generated, but the swirl flow is weakened by only one vertical baffle plate 55, but a vertical vortex may be generated by the vertical baffle plate 55, and bubbles may flow out. all right.
In FIG. 7C, it was observed that no vortex was generated and the swirl was weak on the lower side of the disk. In addition, no vortex was generated even if the swirling energy supply was lost and the water level dropped.
In FIG. 7D, it was found that the swirl was strong above the disk, but the swirl was weak and no vortex was generated below the disk.

From this example, it was confirmed that the water outlet 54 provided better on the side surface than the lower surface as a whole.
In particular, as shown in FIG. 7D, by providing both a vertical baffle plate and a donut-shaped disc, swirling below the disc 56 is prevented without preventing swirling flow above the disc. It was confirmed that it can be greatly reduced.
Further, as shown in FIG. 7C, the same effect can be obtained with only the donut-shaped disk 56, and when the water outlet 54 is provided on the side surface, no vortex is generated even if the water level is lowered. Was confirmed.

Based on the results of Examples 3 and 4, an air / water separator in which the liquid introduction pipe 18 of FIG. 3 was omitted was manufactured, and a test using an actual water jet screw compressor was performed.
In this embodiment, the inner diameter D of the upper portion of the body of the vertical pressure vessel 12 is about 400 mm, the hollow inner tube 17 has an outer diameter of about 270 mm and an inner diameter of about 260 mm, and the length / inner diameter ratio of the hollow inner tube 17 is 1.0 to 1.2. Further, the predetermined height H from the highest liquid level was in the range of 0.9 to 1.1 of the inner diameter D.
Furthermore, the opening 16a of the horizontal baffle plate 16 was circular with a diameter of about 255 mm, and the inner diameter / opening diameter ratio was in the range of 1.4 to 1.7.

As a result, the following was confirmed.
(1) A large tornado-like vortex does not occur.
(2) The swirl flow is strong on the upper side of the disc but weak on the lower side.
(3) Although the amount of bubbles is large on the upper side of the disc, there are few bubbles that wrap around to the lower side.
(4) Bubbles that wrap around the disk do not reach the bottom of the tank.
(5) Some air bubbles are still mixed in the compressor body.

  Therefore, it has been confirmed that the air-water separator shown in FIG. 2 eliminates the tornado-like vortex, can weaken the swirling flow below the disk, and can greatly reduce the amount of gas mixed into the separated liquid. It was.

In Example 5, it was confirmed that the amount of gas mixed into the separated liquid could be greatly reduced, but as described in (5), some air bubbles were still mixed in the compressor body.
Therefore, a steam separator having the liquid introduction pipe 18 added to Example 5 was manufactured, and a test using an actual water jet screw compressor was performed.
In this example, the inner diameter of the liquid introduction tube 18 was about 55 mm, and the height between the lower end and the bottom portion 12 b of the inclined gradient was about 15 to 30 mm.
As a result, it was confirmed that bubbles mixed in the compressor body were further reduced.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

1 is an overall configuration diagram of a water jet type gas compressor provided with a gas-liquid separator of the present invention. It is a 1st embodiment figure of a gas-liquid separation device by the present invention. It is 2nd Embodiment figure of the gas-liquid separator by this invention. It is 3rd Embodiment figure of the gas-liquid separator by this invention. It is a schematic diagram of the solution for solving a problem. It is a schematic diagram which shows the test state using a simulation tank. It is a schematic diagram which shows another test state using a simulation tank. It is a schematic diagram of the water injection type air compressor of patent documents 1. It is a schematic diagram of the steam separator of patent document 2.

Explanation of symbols

1 air, 2 liquid (water), 3 pressurized gas (compressed air), 4 gas-liquid two-phase flow,
10 gas-liquid separator, 11 check valve, 12 vertical pressure vessel,
12a top, 12b bottom, 12c trunk, 13 two-phase flow supply pipe,
14 gas discharge pipe, 15 liquid discharge pipe, 15a inner end face,
16 horizontal baffle plate, 16a opening, 17 hollow inner tube,
18 Liquid introduction pipe, 19 Rotation suppression plate,
20 compressor body, 22 electric motor, 23 belt,
24 water cooler, 26 dryer (dehumidifier), 31 compressed air line,
33 Water line, 34 Compressed air line, 36 Moisture recovery line

Claims (3)

A gas-liquid separator that separates a gas-liquid two-phase flow into a gas and a liquid,
A container comprising a top portion, a bottom portion, and a hollow cylindrical body connecting the bottom portion;
A two-phase flow supply pipe for supplying the gas-liquid two-phase flow into the container in a tangential direction of the body portion;
A gas discharge pipe for discharging gas from the top;
A liquid discharge pipe for discharging liquid from the container,
A first baffle plate is provided below the two-phase flow supply pipe to partition the body part up and down and have an opening in the center.
The gas-liquid separator according to claim 1, wherein an inlet of the liquid discharge pipe is opened laterally below the first baffle plate. Partitioning between the two-phase flow supply pipe and the gas discharge pipe, the upper end is connected to the top of the vertical pressure vessel, includes a hollow inner pipe that extends downward from the highest liquid level to a predetermined height, and the lower end is open,
The gas-liquid separation device according to claim 1, wherein a flow path in which a gas-liquid two-phase flow can swirl horizontally is formed between the hollow inner tube and the body portion. An inlet and one end of the liquid discharge pipe communicate with each other, the other end opens downward from the bottom of the container at a predetermined height, and is located outside the opening of the first baffle plate The gas-liquid separation device according to claim 1, wherein the gas-liquid separation device is provided.

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