JP2012170892A - Sedimentation type liquid/liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sedimentation type liquid/liquid separator capable of effectively exhibiting a liquid separation function and improving liquid separation efficiency.SOLUTION: The liquid/liquid separator separates the liquid mixture in which liquids with different specific gravities are mixed with each other while forming an interface therebetween, into respective liquids and comprises a body portion 10, a sedimentation member 23 for settling the liquid of higher specific gravity in the liquid mixture in the body portion 10 and flow straightening members 21, 22 disposed between the sedimentation member 23 and an inflow passage 14 in the body portion 10. The body portion 10 includes a hollow cylindrical body portion 11 having a liquid passage disposed therein, the inflow passage 14 for supplying the liquid mixture to the liquid passage 10h of the body portion 11, and discharge passages 11a, 11b for discharging the separated liquid from the body portion 11. Further the flow straightening members 21, 22 comprise an upstream side flow straightening member 21 where through holes 21a, 21b with different hole diameters are formed and a down stream side flow straightening member 22 where through holes 22h with a uniform hole diameter are formed.

Description

  The present invention relates to a sedimentation type liquid-liquid separator. More specifically, the present invention relates to a sedimentation type liquid-liquid separator that separates a mixed liquid, such as oil and water, in which liquids having different specific gravities form an interface and mixes them.

  2. Description of the Related Art Conventionally, a device for performing gravity sedimentation operation utilizing a specific gravity difference has been developed as a device for separating a mixed liquid in which liquids having different specific gravities such as water and oil form an interface and mixing them into liquids ( For example, Patent Documents 1 and 2)

  Patent Document 1 discloses a suspension separation device that includes a current plate and an inclined channel assembly having an inclined channel inclined with respect to the channel, and both are provided in a mixed liquid channel. In addition, it is described that the liquid mixture having a parallel laminar flow by the rectifying plate is allowed to flow into the inclined flow path, and the liquid having a large specific gravity is settled and separated as a settled liquid from the main liquid having a small specific gravity.

Patent Document 2 has a main body portion having a hollow cylindrical body portion, and a rectifying member and a settling member for settling a settling liquid having a large specific gravity in the mixed liquid that has passed through the rectifying member are provided in the main body portion. A settling liquid-liquid separator is described.
In the sedimentation type liquid-liquid separator of Patent Document 2, the mixed liquid is brought close to the laminar flow state by the rectifying member, and the mixed liquid approaching the laminar flow state is supplied to the region where the sedimentation member is provided. Therefore, the separation of the mixed liquid is promoted.

  By the way, in the techniques of Patent Documents 1 and 2, the inclined flow path and the sedimentation member have a plurality of flow paths for flowing the mixed liquid. For this reason, in order to efficiently separate the liquid by the inclined flow path or the sedimentation member, it is preferable that all the flow paths function so as to perform liquid separation with substantially the same efficiency. Specifically, the flow rate and the state of the mixed liquid supplied to all the flow paths are preferably the same (that is, the mixing ratio of the main liquid and the precipitated liquid in the mixed liquid is the same).

  However, all the rectifying plates and rectifying members provided in Patent Documents 1 and 2 are formed with through holes having the same diameter. For this reason, although the flow of the mixed liquid can be made close to a laminar flow by passing the rectifying plate or the rectifying member through the mixed liquid, the speed of the mixed liquid in the cross section of the body portion cannot be made uniform. This is because the main liquid having a large amount tends to flow toward the upper part of the mixed liquid, while the precipitated liquid having a small amount tends to flow toward the lower part of the mixed liquid. Then, due to the difference in flow rate between them, the speed of the mixed liquid passing through the current plate becomes faster in the upper part where the main liquid is flowing, compared to the lower part. Circulation flow may occur between the plate and the settling member. When such a circulating flow is generated, the speed of the mixed liquid is increased in a portion where the flow toward the settling member is generated in the circulating flow, so that a distance necessary for settling the settling liquid from the main liquid becomes long. On the other hand, the sinking member cannot be used in a portion where the flow in the direction opposite to that of the sinking member occurs.

  Further, even in the rectifying plate and the rectifying member provided in Patent Documents 1 and 2, if a through hole having a small hole diameter is formed, the pressure loss when passing through the rectifying plate and the rectifying member is increased. Then, since the speed difference between the fluids passing through the upper part and the lower part of the rectifying plate and the rectifying member can be reduced, there is a possibility that the generation of the circulating flow can be prevented. However, when the pressure loss when passing through the rectifying plate or the rectifying member becomes large, the precipitated liquid in the mixed liquid is separated (reduced in particle size) when passing through the rectifying plate or the rectifying member, so that The separation efficiency for separating the precipitated liquid from the liquid deteriorates.

  Furthermore, even if a rectifying plate or a rectifying member is provided and a circulating flow is generated behind the rectifying plate or the rectifying member, the circulating flow is not strong enough to promote the mixing of the main liquid and the settled liquid. Before and after passing through the current plate and the current member, the mixing ratio of the main liquid and the settled liquid in the mixed liquid is maintained almost as it is. As described above, the mixed liquid before passing through the current plate or the current member usually has a large proportion of the main liquid having a small specific gravity in the upper portion and a large proportion of the settled liquid having a large specific gravity in the lower portion. For this reason, even after passing the current plate or current member, the mixed liquid supplied to the inclined flow channel or the sedimentation member is in a state where the mixed state of the two differs depending on the flow channel. become. Then, the liquid separation function becomes excessive in the portion where the mixed liquid with a small proportion of the precipitated liquid is supplied, and the liquid separation cannot be sufficiently performed in the portion where the mixed liquid with a large proportion of the precipitated liquid is supplied. there is a possibility.

As described above, the techniques of Patent Documents 1 and 2 sufficiently improve the separation efficiency in the inclined flow path and the sedimentation member even though the flow of the mixed liquid can be brought close to the laminar flow to some extent by providing the flow straightening plate and the flow straightening member. It is difficult to do.

Japanese Patent No. 3681003 JP 2009-178654 A

  In view of the above circumstances, an object of the present invention is to provide a sedimentation type liquid-liquid separator that can effectively exhibit a liquid separation function and can improve liquid separation efficiency.

A sedimentation type liquid-liquid separator according to a first aspect of the present invention is a device for separating a mixed liquid obtained by mixing liquids having different specific gravities by forming an interface into each liquid, the hollow cylindrical body having a liquid passage inside An inflow passage that is provided at a front end of the body portion and supplies a mixed liquid to a liquid passage of the body portion; and a discharge passage that is provided at a rear end of the body portion and discharges the separated liquid from the body portion. A main body portion provided in the main body portion, a settling member for precipitating a liquid having a large specific gravity in the mixed liquid, and a flow regulating member provided between the settling member and the inflow passage in the main body portion. The rectifying member is formed with an upstream rectifying member in which a plurality of through holes having different hole diameters are formed, and a through hole having a uniform hole diameter disposed on the settling member side with respect to the upstream rectifying member The downstream side straightening member, and the upstream side Flow through hole of the member is characterized in that the size of the through hole formed at its top and bottom are different.
In the sedimentation type liquid-liquid separator according to a second aspect of the present invention, in the first aspect, the inflow passage supplies the mixed liquid from a direction along the axial direction of the liquid passage toward the inner surface of the front end of the body portion. It is arranged so that it may be arranged.
In the sedimentation type liquid-liquid separator according to a third aspect of the present invention, in the first aspect, the upstream rectifying member has a collision portion that does not allow liquid to permeate at a portion that intersects with the axial extension line of the inflow passage. It is characterized by.
The sedimentation type liquid-liquid separator according to a fourth aspect of the present invention is the first, second or third aspect of the invention, wherein the supply port of the inflow passage is settled in the liquid passage in the liquid passage of the body portion. It is arranged at a position where a free surface of a liquid having a large specific gravity is formed.
It is characterized by that.

According to the first invention, in the upstream rectifying member, the sizes of the through holes formed in the upper part and the lower part thereof are different. Then, when the hole diameter of the through-hole formed in the upper part is made larger than that of the through-hole formed in the lower part, the mixed liquid is more likely to pass through the upper part of the upstream rectifying member than in the lower part. On the contrary, when the hole diameter of the through hole formed in the lower part is made larger than that of the through hole formed in the upper part, the mixed liquid passes through the lower part of the upstream rectifying member more easily than the upper part. For this reason, when there is a large amount of liquid with a high specific gravity (high specific gravity liquid) in the mixed liquid, it is uniform if the hole diameter of the through hole formed in the upper part is larger than the through hole formed in the lower part. Compared with the case where the through-hole of an appropriate hole diameter is formed, the ratio of the high specific gravity liquid that passes through the upper part of the upstream rectifying member can be increased. Then, the flow rate of the mixed liquid after passing through the upstream rectifying member can be made close to uniform in the cross section of the body portion, so that the function of equalizing the flow rate of the mixed liquid by the downstream rectifying member can be enhanced. In addition, since a relatively large amount of high specific gravity liquid that easily passes through the lower portion of the upstream rectifying member can be passed through the upper portion of the upstream rectifying member, the high specific gravity liquid is interposed between the upstream rectifying member and the downstream rectifying member. Uniformity of the mixing ratio of the mixed liquid between both plates can be promoted by settling to some extent. Similarly, when there are many liquids with low specific gravity (low specific gravity liquid) in the mixed liquid, it is uniform if the diameter of the through hole formed in the lower part is larger than the through hole formed in the upper part. The ratio of the low specific gravity liquid that passes through the lower part of the upstream rectifying member can be increased as compared with the case where a through hole having a small hole diameter is formed. Then, the flow rate of the mixed liquid after passing through the upstream rectifying member can be made close to the cross section of the body portion in the cross section, so that the function of equalizing the flow rate of the mixed liquid by the downstream rectifying member is enhanced. Can do. In addition, since a relatively large amount of low specific gravity liquid that easily passes through the upper portion of the upstream rectifying member can be passed through the lower portion of the upstream rectifying member, the low specific gravity liquid is interposed between the upstream rectifying member and the downstream rectifying member. By raising to some extent, the mixing ratio of the mixed liquid between both plates can be promoted. Therefore, since the state of the mixed liquid after passing through the flow straightening member can be made uniform in the cross section of the trunk portion, liquid separation can be performed with substantially the same efficiency in all the flow paths in the settling member. The separation efficiency, that is, the liquid separation efficiency of the apparatus can be increased.
According to the second invention, when the mixed liquid is supplied from the inflow passage toward the inner surface of the front end of the body portion, the mixed liquid supplied from the supply port of the inflow passage flows in the liquid passage of the body portion. It flows in the opposite direction (hereinafter referred to as the main direction) and collides with the inner surface of the front end of the trunk. And, when the mixed liquid supplied from the supply port of the inflow passage collides with the inner surface of the front end of the body part, it once stays in the vicinity of the inner surface of the front end of the body part and flows in the main direction after the flow direction changes. The flow is lower than that in the state of being supplied from the supply port of the inflow passage and flows in the liquid passage toward the rectifying member. In addition, by causing the mixed liquid to collide with the inner surface of the front end of the body, a substantially radial flow having almost the same flow velocity along the inner surface of the front end of the body is formed, and then it flows in the main direction. it can. Then, before being supplied to the rectifying member, the state of the mixed liquid can be a flow having a substantially uniform flow velocity in the cross section of the body portion and a substantially uniform mixed state. In other words, since the state of the mixed liquid can be made uniform to some extent within the cross section of the body part before the mixed liquid reaches the rectifying member, the state of the mixed liquid after passing through the rectifying member is made more uniform. State.
According to the third aspect of the invention, the mixed liquid flowing in from the outside through the inflow passage can be prevented from passing through the upstream rectifying member, so that the mixing between the upstream rectifying member and the downstream rectifying member can be prevented. The function of homogenizing the liquid and the function of reducing the proportion of the secondary liquid in the mixed liquid can be maintained. Therefore, the liquid separation efficiency of the apparatus can be further increased.
According to the fourth aspect of the present invention, when the mixed liquid is supplied from the supply port of the inflow passage, the mixed liquid in the trunk portion can be made difficult to be stirred, so that the separated liquids can be prevented from being remixed. it can. Then, the fall of the efficiency which isolate | separates the liquid resulting from the re-mixing of the separated liquids can be suppressed.

It is a schematic sectional drawing of the sedimentation type liquid-liquid separator of this embodiment. (A) is a sectional view taken along line AA in FIG. 1, (B) is a sectional view taken along line BB in FIG. 1, and (C) is a sectional view taken along line CC in FIG. FIG. (A) is a schematic sectional drawing of the sedimentation type liquid-liquid separator of other embodiment, (B) is a BB sectional view taken on the line of FIG. It is schematic explanatory drawing of the sedimentation type liquid-liquid separator of a comparative example, Comprising: (A) is sectional drawing, (B) is a BB sectional view taken on the line of (A), (C) is ( It is a CC sectional view taken on the line of A). It is the calculation result of the condition in the separator of a comparative example, (A) is flow velocity distribution, (B) is the calculation result of water volume fraction distribution. It is the calculation result of the condition in the separator of an Example, (A) is flow velocity distribution, (B) is the calculation result of water volume fraction distribution.

Next, an embodiment of the present invention will be described with reference to the drawings.
The sedimentation type liquid-liquid separator of this embodiment is an apparatus that separates mixed liquids obtained by mixing liquids having different specific gravities by forming an interface, and continuously mixing liquids like chemical plants and processing apparatuses. Equipment suitable for equipment that needs to be processed.
In particular, it is characterized in that it can be efficiently separated into each liquid even in the case of a mixed liquid in which the difference in the mixing ratio of each liquid is relatively small.

  The mixed liquid in which liquids having different specific gravities form an interface and mixed is, for example, a mixed liquid in which oil and water or oil and alcohol are mixed. Specifically, a liquid in which a liquid with a small mixing ratio is dispersed and present in the form of droplets in a liquid with a high mixing ratio in the mixed liquid. The mixed liquid separated into the respective liquids by the sedimentation type liquid-liquid separator of the present embodiment is not limited as long as liquids having different specific gravities are mixed to form an interface, and the liquid mixed in the mixed liquid. The type of is not particularly limited.

Hereinafter, a liquid having a small specific gravity in the mixed liquid is referred to as a low specific gravity liquid, and a liquid having a specific gravity larger than that of the low specific gravity liquid is referred to as a sedimented liquid.
Further, in the mixed liquid separated by the sedimentation type liquid-liquid separator of the present embodiment, the mixing ratio of the low specific gravity liquid and the sedimentation liquid is not particularly limited, but in the following, the sedimentation liquid is mixed with the low specific gravity liquid. A case will be described as a representative. That is, the case where the mixed liquid in which the precipitated liquid is dispersed in the state of droplets in the low specific gravity liquid is separated into the low specific gravity liquid and the precipitated liquid will be described as a representative.

(Description of the overall structure of the sedimentation type liquid-liquid separator 1 of this embodiment)
In FIG. 1, the code | symbol 10 has shown the main-body part of the sedimentation type liquid-liquid separator 1 (henceforth only the separator 1) of this embodiment. The main body 10 is a hollow container having a hollow cylindrical body 11 and end plates 12 and 13 having inner surfaces formed in a substantially spherical shape, provided at both ends in the axial direction of the body 11. is there. For example, if the separator 1 of the present embodiment is used in a chemical plant, the main body 10 has an inner diameter of the trunk portion 11 of about several meters and an axial length that is smaller than the inner diameter of the trunk portion 11. Although the thing of about several times is used, the main-body part 10 is not specifically limited to the above magnitude | sizes, It can determine freely with the quantity, physical property, etc. of the liquid to process.

An inflow passage 14 for supplying a mixed liquid into the main body portion 10 is provided at the left end portion (front end portion) of the body portion 11. The inflow passage 14 is a tubular member disposed on the side surface of the trunk portion 11. The inflow passage 14 has an upper end protruding outside the main body 10 and a lower end disposed in the main body 10.
The inflow passage 14 is disposed such that the lower end thereof is positioned at the height of the interface (free interface FS) between the settling liquid and the mixed liquid accumulated in the lower part of the main body 10. The supply port 14a for supplying the mixed liquid into the body portion 11 of the main body portion 10 is provided on the side surface of the inflow passage 14 on the front end end plate 12 (front end end plate 12) side, and the reason will be described later.

  As shown in FIG. 1, two rectifying members 21 and 22 and a settling member 23 are arranged in this order on the right end side (rear end side) with respect to the inflow passage 14. The two rectifying members 21 and 22 and the settling member 23 are provided to separate the mixed liquid into the low specific gravity liquid and the settling liquid, and details thereof will be described later.

In the vicinity of the rear end portion of the main body portion 10, a separation plate 10 d that partitions the inside of the body portion 11 of the main body portion 10 is provided between the settling member 23 and the end plate 13 (rear end end plate 12). Specifically, a separation plate 10d is provided so as to separate the inside of the body portion 11 into a liquid separation space and a low specific gravity liquid discharge space. The liquid separation space is a space in which the settling member 23 is accommodated.
The separation plate 10d is provided so that a communication passage 10f that communicates the two spaces is formed between the upper end of the separation plate 10d and the inner surface of the body portion 11. For this reason, the liquid located in the upper part of the liquid separation space, that is, the low specific gravity liquid can flow into the low specific gravity liquid discharge space through the communication passage 10f.

  Discharge passages 11a and 11b for discharging liquid from the inside of the main body 10 to the outside are provided at the rear end of the main body 10.

  At the rear end portion of the body portion 11, a sedimented liquid discharge passage 11a is provided in the lower part on the liquid separation space side in the vicinity of the separation plate 10d. The sedimented liquid discharge passage 11a is a passage for discharging the sedimented liquid separated from the low specific gravity liquid to the outside. The sedimented liquid discharge passage 11a is provided with a device (for example, a valve) that can cut off communication between the inside and the outside of the main body 10 and allows the sedimented liquid to be discharged from the sedimented liquid discharge passage 11a every predetermined period. It comes to discharge. Specifically, the discharge amount of the settled liquid is adjusted so that the amount accumulated in the lower portion of the body portion 11 becomes a predetermined amount (that is, a predetermined depth).

  On the other hand, a low specific gravity liquid discharge passage 11b is provided at the rear end of the body portion 11 below the low specific gravity liquid discharge space in the vicinity of the separation plate 10d. The low specific gravity liquid discharge passage 11b is a passage that discharges the low specific gravity liquid that has flowed into the low specific gravity liquid discharge space from the communication passage 10f after the settled liquid is separated. The low specific gravity liquid discharge passage 11b is provided with a device (for example, a valve) that can cut off communication between the inside and the outside of the main body portion 10, and the low specific gravity liquid discharged from the low specific gravity liquid discharge passage 11b. The flow rate is adjusted. Specifically, the liquid surface of the low specific gravity liquid is adjusted to have a certain height.

Since the configuration is as described above, the mixed liquid can be supplied into the body portion 11 of the main body 10 by supplying the mixed liquid from the inflow passage 14 provided at the front end of the main body 10.
Since the main body portion 10 is provided with the discharge passages 11a and 11b at the rear end portions thereof, the mixed liquid flows through the body portion 11 from the inflow passage 14 toward the discharge passages 11a and 11b (that is, from the front end of the main body portion 10 to the rear) Flowing towards the edge).
Then, since the two rectifying members 21 and 22 and the settling member 23 are provided between the inflow passage 14 and the discharge passages 11a and 11b in the body portion 11, the discharge passage 11a, The precipitated liquid is separated from the low specific gravity liquid while flowing to 11b.
Then, since the settled liquid is stored in the lower portion of the liquid separation space, only the low specific gravity liquid located in the upper portion of the liquid separation space flows into the low specific gravity liquid discharge space from the communication passage 10f. Therefore, the liquids separated in the liquid separation space can be discharged from the discharge passages 11a and 11b without remixing.
That is, in the separator 1 of the present embodiment, if the mixed liquid is supplied into the body portion 11 from the inflow passage 14, the mixed liquid can be separated from the low specific gravity liquid and the settled liquid, and the separated liquids are separated from each other. Each can be recovered.

  In addition, the low specific gravity liquid discharged from the low specific gravity liquid discharge passage 11b described above does not mean only a liquid that does not contain any settling liquid, but settles compared to the mixed liquid supplied from the inflow passage 14. Needless to say, the liquid content is reduced. Similarly, the settling liquid discharged from the settling liquid discharge passage 11a described above does not mean only a liquid containing almost no low specific gravity liquid, but also includes a liquid containing some low specific gravity liquid. Nor.

  Further, a gas discharge part 11 e is provided above the front end of the body part 11. The gas discharge part 11e is provided with an instrument (for example, a valve) that can cut off communication between the inside and the outside of the main body part 10, and can appropriately discharge the gas accumulated in the main body part 10. It is configured as follows.

(Detailed explanation of each part)
Below, each part of the sedimentation type liquid-liquid separator 1 of this embodiment is demonstrated in detail.

(Description of the two rectifying members 21 and 22)
In the separator 1 of the present embodiment, two rectifying members 21 and 22 and a settling member 23 are provided in the body portion 11 of the main body portion 10 in order to enhance the separation effect.

  As shown in FIG. 1, between the inflow passage 14 and the settling member 23, two rectifying members 21 and 22 that partition the inside of the body portion 11 of the main body portion 10 are provided. Specifically, the two rectifying members 21 and 22 are provided so as to separate the front end portion of the body portion 11 into the liquid supply space and the liquid separation space. As described above, the liquid separation space is a space in which the settling member 23 is accommodated, and the liquid supply space is a space in which the inflow passage 14 is accommodated.

  Each of the two rectifying members 21 and 22 is a plate-like member, and a plurality of through holes penetrating the front and back surfaces thereof are formed (FIGS. 2A and 2B).

  First, of the two rectifying members 21 and 22, the rectifying member 21 (hereinafter referred to as the upstream rectifying member 21) located on the inflow passage 14 side is a plate-like member in which a plurality of through holes are formed. The upstream rectifying member 21 is formed with a plurality of through holes 21a and 21b having different hole diameters. For example, as shown in FIG. 2A, the upstream rectifying member 21 is provided with a region (upper region 21A) in which a through hole 21a having a large hole diameter is formed in the upper portion, and a through hole 21b having a small hole diameter. A region (lower region 21B) in which is formed is provided in the lower part. The upper region 21A is provided so that its area is smaller than that of the lower region 21B.

  The rectifying member 22 (hereinafter referred to as the downstream rectifying member 22) is also a plate-like member in which a plurality of through holes are formed. Unlike the upstream rectifying member 21, the downstream rectifying member 22 is formed with through holes 22 h having the same hole diameter. The diameter of the through hole 22h is not particularly limited, but is preferably about the same as the through hole 21a of the upstream rectifying member 21 in order to effectively exert the rectifying effect.

  If the two rectifying members 21 and 22 having the structure as described above are provided, the following effects can be obtained.

  First, in the mixed liquid flowing toward the upstream rectifying member 21, the sedimented liquid flows toward the lower portion of the upstream rectifying member 21 because the specific gravity of the sedimented liquid is larger than the specific gravity of the low specific gravity liquid. For this reason, in the flow of the mixed liquid toward the upstream rectifying member 21, the lower flow velocity tends to be faster than the upper portion.

  On the other hand, the upstream rectifying member 21 has a through hole 21b formed in the lower region 21B smaller than the through hole 21a formed in the upper region 21A. The mixed liquid is less likely to pass through the lower region 21B) than at the upper portion (upper region 21A). That is, the resistance when the mixed liquid passes is larger in the lower part of the upstream rectifying member 21 than in the upper part.

  Then, when passing through the upstream rectifying member 21, the flow of the mixed liquid passing through the lower region 21B is suppressed as compared with the flow of the mixed liquid passing through the upper region 21A. In the position, the difference in the flow rate of the mixed liquid between the upper part and the lower part can be reduced. That is, the difference in the flow rate of the mixed fluid depending on the position in the cross section of the liquid passage 10h can be reduced, and the flow rate of the mixed liquid in the cross section of the liquid passage 10h can be made to be uniform.

Since the mixed liquid that has passed through the upstream rectifying member 21 passes through the downstream rectifying member 22 in which the uniform through-hole 22h is formed, the difference in the flow rate of the mixed liquid depending on the position in the cross section of the liquid passage 10h is obtained. It can be made closer to a smaller state.
Then, since it is possible to prevent a circulating flow due to the difference in flow rate of the mixed liquid from occurring at a position that has passed through the downstream side rectifying member 22, the low specific gravity liquid and the sedimented liquid that are generated when the circulating flow is generated are separated. Therefore, it is possible to prevent a difference from being made in the distance necessary for the purpose (the distance necessary for causing the sedimented liquid to settle).

  In addition, when the flow of the mixed liquid passing through the lower region 21B is suppressed as compared with the flow of the mixed liquid passing through the upper region 21A when passing through the upstream side rectifying member 21, the flow was toward the lower region 21B. A part of the settled liquid can flow toward the upper region 21A. That is, as compared with the case where all the through holes having the same hole diameter are formed in the upstream rectifying member 21, a relatively large amount of the settled liquid can pass through the upper region 21 </ b> A of the upstream rectifying member 21. Then, between the upstream rectifying member 21 and the downstream rectifying member 22, the sedimented liquid that has passed through the upper region 21 </ b> A settles to some extent, so that the low specific gravity liquid and the sediment in the mixed liquid are set between the rectifying members 21 and 22. As the mixing of the liquid proceeds, the difference in the mixing ratio of the two liquids in the mixed liquid can be reduced within the cross section of the liquid passage 10h.

  That is, by providing the two rectifying members 21 and 22, the difference in the state of the mixed liquid (flow velocity, mixing ratio, etc.) supplied to the settling member 23 can be reduced in the cross section of the liquid passage 10h.

(Explanation of the two rectifying members 21 and 22 in the case of sedimentation liquid> low specific gravity liquid)
In the above example, the case where the amount of the low specific gravity liquid in the mixed liquid is larger than that of the sedimented liquid has been described. On the contrary, in the mixed liquid, the amount of the precipitated liquid is compared with that of the low specific gravity liquid. When the amount is large, the following rectifying member is used.

In the mixed liquid, when the amount of the settled liquid is larger than the low specific gravity liquid, the upstream rectifying member 21 shown in FIG. 2A rotated 180 degrees is used as the upstream rectifying member. In other words, the hole diameter of the through hole formed in the lower portion is larger than that of the through hole formed in the upper portion, and the area of the portion (lower region) where the through hole having a larger hole diameter is formed is smaller in the hole diameter. What is narrower than the area of the portion (upper region) where the through hole is formed is used as the upstream rectifying member.
Then, since the flow rate of the mixed liquid passing through the upper region can be suppressed, the flow rate of the mixed liquid in the cross section of the liquid passage 10h (that is, mixing in the cross section of the liquid passage 10h) at the position that has passed through the upstream rectifying member. The difference in the liquid flow rate) can be reduced.
In addition, since the ratio of the low specific gravity liquid that passes through the lower portion of the upstream rectifying member can be increased compared to the case where all the through holes having the same hole diameter are formed in the upstream rectifying member, the upstream rectifying member and the downstream rectifying member The low specific gravity liquid rises to a certain extent between the two rectifying members, so that the mixing of the low specific gravity liquid and the settled liquid in the mixed liquid proceeds between the two rectifying members. The difference can be reduced.
Therefore, even when the amount of settled liquid is larger than that of the low specific gravity liquid, the difference in the state of the mixed liquid (flow velocity, mixing ratio, etc.) after passing through the downstream rectifying member is reduced in the cross section of the liquid passage 10h. be able to.

(Description of sedimentation member 23)
Further, as shown in FIG. 1, a sedimentation member 23 is provided between the downstream rectifying member 22 and the separation plate 10d. A plurality of through holes 23 h are formed in the sedimentation member 23 along the direction of the body 11 of the main body 10. The plurality of through holes 23h are arranged such that their central axes are horizontal, and are formed so that their central axes are parallel to each other.
The plurality of through holes 23h have a substantially square cross-sectional shape, and almost all the through holes 23h have the same shape and the same cross-sectional area. As shown in FIG. 2C, the through hole 23 h formed at a position where the settling member 23 and the inner surface of the body portion 11 are in contact with each other is formed in a shape that matches the inner surface shape of the body portion 11.

Since the sedimentation member 23 is configured as described above, the mixed liquid can flow into the plurality of through holes 23h of the sedimentation member 23 in the region where the sedimentation member 23 is provided in the liquid passage 10h.
The mixed liquid that has flowed into the plurality of through holes 23h is separated into a sedimented liquid and a low specific gravity liquid when passing through the through holes 23h. Specifically, the settled liquid settles in the through hole 23h of the settling member 23, and the settled settled liquid comes into contact with and adheres to the inner surface of the through hole 23h and is separated from the mixed liquid (that is, low specific gravity liquid). The At this time, since the through-hole 23h has a small cross-sectional area (short in the vertical direction), the settling distance until the settled liquid comes into contact with the inner surface of the through-hole 23h is shortened, and the settled liquid becomes the inner surface of the through-hole 23h. The time until contact with is also shortened.
Therefore, if the settling member 23 is provided as described above, the settling liquid and the low specific gravity liquid can be separated quickly and efficiently.

Then, the settled liquid adhering to the inner surfaces of the plurality of through holes 23h is pushed toward the rear end of the settling member 23 by the mixed liquid flowing in the through holes 23h, and is discharged from the rear end of the settling member 23. Then, the settled liquid separated from the mixed liquid in the through hole 23h of the settling member 23 can be discharged from the rear end of the settling member 23 and settled on the bottom of the liquid passage 10h.
On the other hand, the mixed liquid from which the settled liquid is separated flows from the plurality of through holes 23h upward after flowing out from the plurality of through holes 23h, and flows into the low specific gravity liquid discharge space through the communication passage 10f.
Therefore, it is possible to prevent the settled liquid that has been discharged from the rear end of the settling member 23 and settled toward the bottom of the liquid passage 10h from being mixed again with the mixed liquid having a high ratio of the low specific gravity liquid.

Further, since the plurality of through holes 23h are formed so that their cross-sectional shapes and cross-sectional areas are substantially the same, the difference in flow resistance between the through holes 23h when the mixed liquid flows can be reduced. Then, the mixed liquid can be made to flow almost uniformly into the plurality of through holes 23h of the settling member 23. That is, since the flow rate of the mixed liquid passing through each through hole 23h of the settling member 23 can be made substantially uniform, all the through holes 23h can be effectively used for liquid separation, and the liquid separation efficiency as an apparatus Can be increased.
In particular, by providing the two rectifying members 21 and 22 as described above, if the state of the mixed liquid supplied to the settling member 23 is substantially uniform in the cross section of the liquid passage 10h, each through-hole 23h The liquid separation efficiency can be made almost uniform in any through-hole 23h, so that the liquid separation efficiency as an apparatus can be further increased.

  Furthermore, since the settling member 23 is disposed so that the central axes of the plurality of through holes 23h are horizontal, the resistance of the mixed liquid to push the settling liquid in the through holes 23h is reduced. Therefore, it is possible to efficiently discharge the precipitated liquid from the plurality of through holes 23h, and it is possible to prevent the two liquids once separated from being mixed again.

  The centering axis of the plurality of through holes 23h may not be horizontal in the sedimentation member 23. If the sedimentation liquid is mixed with the low specific gravity liquid, the sedimentation member 23 is not inclined upward from the upstream side to the downstream side. I just need it. For example, when the liquid is inclined downward from the upstream side toward the downstream side, the resistance of the settling liquid on the inner surface of the through hole to be pushed by the mixed liquid can be further reduced. Can be discharged. Then, the liquid separation efficiency in the through-hole 23h of the sedimentation member 23 can be increased, and remixing of both liquids once separated can also be prevented.

(Method for forming sedimentation member 23)
The settling member 23 as described above may be formed by any method and is not particularly limited. For example, if a plurality of tubular members are formed side by side, the settling member 23 can be easily formed. When a plurality of tubular members are formed side by side, by using tubular members having the same diameter, the settling members 23 in which the cross-sectional shapes and the cross-sectional areas of all the through holes 23h are the same are easily and reliably formed. be able to.

(Cross-sectional shape of the through hole)
The cross-sectional shape of the through-hole 23h formed in the settling member 23 is not limited to the rectangle as described above, and may be a circle or a triangle, and is not particularly limited.
For example, in the case of a mixed liquid in which high-purity water (precipitation liquid) is mixed with a low specific gravity liquid such as oil, the water can be separated from the mixed liquid even if water contacts the side surface of the through hole 23h. When processing such a mixed liquid, if the cross-section of the through-hole 23h is a vertically long rectangle and the side area is increased, water can adhere to the side area and be separated from the low specific gravity liquid. Can be separated from the low specific gravity liquid.

(Description of inflow passage 14)
Further, as shown in FIG. 1, the inflow passage 14 is a tubular member disposed on the side surface of the body portion 11, and the front end end plate of the front end portion of the body portion 11 is more than the two rectifying members 21 and 22. It is arranged on the 12 side.
The front end of the inflow passage 14 is closed, and a supply port 14a is provided on the side surface of the front end portion. That is, the mixed liquid supplied from the proximal end of the inflow passage 14 is supplied into the body portion 11 from the supply port 14a provided on the side surface of the distal end portion.
In addition, the supply port 14a is provided on the side surface on the front end panel 12 side so that the flow direction of the mixed liquid supplied from the supply port 14a into the liquid passage 10h is substantially parallel to the axial direction of the body portion 11. Is formed.

Since the inflow passage 14 is structured as described above, the mixed liquid supplied from the supply port 14a of the inflow passage 14 flows in the direction in which the mixed liquid flows in the body 11 (from left to right in FIG. 1, hereinafter referred to as the main direction). ) In the opposite direction to collide with the inner surface of the front end panel 12. Then, the liquid mixture that has collided with the inner surface of the front end end plate 12 once stays in the vicinity of the inner surface of the front end end plate 12 and then flows in the main direction, so that the mixed liquid is supplied from the supply port 14a of the inflow passage 14. Compared to the above, the flow becomes a low speed and flows in the body portion 11 toward the rectifying members 21 and 22.
In addition, since the inner surface of the front end end plate 12 that collides with the mixed liquid has a substantially spherical shape, the mixed liquid flows along the inner surface of the front end end plate 12 by causing the mixed liquid to collide with the inner surface of the front end end plate 12. It is formed. That is, the mixed liquid flows in the main direction along the inner surface of the front end panel 12 after becoming a substantially radial flow with a small speed difference depending on the position. Then, the flow of the mixed liquid becomes a flow with a small difference in flow velocity depending on the position in the cross section of the body portion 11 before reaching the flow regulating members 21 and 22.
That is, by the time the mixed liquid reaches the flow regulating members 21, 22, the flow rate of the mixed liquid can be set to a state in which the difference in flow rate depending on the position is small to some extent within the cross section of the body portion.

  The position where the supply port 14a is formed on the side surface of the inflow passage 14 is not particularly limited, but the supply port 14a is formed at the height of the free surface FS of the settled liquid accumulated in the body portion 11. Is preferred. If the supply port 14a of the inflow passage 14 is disposed at such a position, when the mixed liquid is supplied into the body portion 11 from the supply port 14a of the inflow passage 14, the liquid mixture is accumulated in the body portion 11 due to the supplied mixed liquid. It is possible to suppress the stirring of the settled liquid being generated. As a result, it is possible to prevent the settled liquid collected in the body 11 from becoming droplets again and remixing into the low specific gravity liquid (redispersion into the low specific gravity liquid). It can suppress that the liquid separation efficiency by an apparatus which arises when a sedimentation liquid and a low specific gravity liquid remix is reduced.

Even if the supply port 14a is formed at the height of the free surface FS, a part of the mixed liquid supplied from the supply port 14a to the barrel portion 11 collides with the inner surface of the front end end plate 12 so that the inside of the barrel portion 11 is reached. The phenomenon of flowing into the sedimented liquid that has accumulated in the tank occurs. However, since the amount of the mixed fluid flowing into the sedimented liquid accumulated in the body portion 11 is small and the speed thereof is small, the situation where the sedimented liquid is stirred by the mixed liquid that has flowed in hardly occurs.
Further, since the settled liquid is accumulated at the bottom of the body portion 11, most of the mixed liquid flows in the space above the free interface FS of the settled liquid. Therefore, hereinafter, “the space above the free interface FS of the settled liquid in the body portion 11” is indicated by “liquid passage 10 h”, and “the space above the free interface FS of the settled liquid in the body portion 11”. “Cross section” is indicated as “cross section of liquid passage 10h”.

(Separation of mixed liquid by separator 1)
Next, the separation process of the mixed liquid by the separator 1 of the present embodiment will be described.
First, the mixed liquid to be processed is supplied from the inflow passage 14 into the body 11 of the main body 10. Then, the mixed liquid flows in a direction opposite to the main direction and collides with the inner surface of the front end end plate 12, becomes a substantially radial flow along the inner surface of the front end end plate 12, and then flows in the main direction. That is, the mixed liquid flows toward the front end end plate 12 at one end, then reverses, and flows from the front end end plate 12 toward the rectifying members 21 and 22. Then, while flowing from the front end end plate 12 to the upstream side rectifying member 21, the mixed liquid becomes a flow having a substantially uniform flow velocity in the cross section of the liquid passage 10h.

When reaching the upstream rectifying member 21, the mixed liquid passes through the through hole of the upstream rectifying member 21. In the mixed liquid, since the settled liquid is dispersed in the low specific gravity fluid, the flow rate of the mixed liquid that is going to flow through the lower region 21B of the upstream rectifying member 21 is increased.
On the other hand, since the through hole 21a formed in the upper region 21A is larger than the through hole 21b formed in the lower region 21B, the mixed liquid passes through the lower part of the upstream rectifying member 21 as compared with the upper part. The resistance when doing
Therefore, since the flow rate of the mixed liquid passing through the lower region 21B can be suppressed, the flow rate difference in the cross section of the liquid passage 10h is reduced in the mixed fluid after passing through the upstream rectifying member 21.

  In addition, by suppressing the flow rate of the mixed liquid passing through the lower region 21B, a relatively large amount of settled liquid that easily passes through the lower region 21B of the upstream rectifying member 21 can be passed through the upper region 21A. Then, while the mixed liquid that has passed through the upstream rectifying member 21 flows to the downstream rectifying member 22, the settled liquid that has passed through the upper region 21 </ b> A sinks to some extent. In the meantime, the mixing of the low specific gravity liquid and the sedimented liquid in the mixed liquid proceeds, and the difference in the mixing ratio of the mixed liquid in the cross section of the liquid passage 10h is also reduced.

  Then, the mixed fluid after passing through the upstream rectifying member 21 passes through the downstream rectifying member 22 in which the uniform through hole 22h is formed, so that the flow velocity in the cross section of the liquid passage 10h is further uniformized.

  The mixed liquid that has passed through the downstream rectifying member 22, that is, the mixed fluid in which the difference between the flow velocity and the mixing ratio in the cross section of the liquid passage 10 h has passed through the region where the settling member 23 is provided. At this time, while flowing in the through hole 23h of the sedimentation member 23 from the front end toward the rear end, the sedimented liquid in the mixed liquid settles and contacts and adheres to the inner bottom surface of the through hole 23h. Separated from. That is, the sedimented liquid and the low specific gravity liquid are separated in the through hole 23h.

  The separation of the settled liquid and the low specific gravity liquid proceeds while the mixed liquid passes through the through hole 23h, and disperses into the low specific gravity liquid as the mixed liquid flows toward the rear end of the through hole 23h. The ratio of settled liquid gradually decreases. Then, when discharged from the rear end of the through hole 23h, the ratio of the sedimented liquid dispersed in the low specific gravity liquid becomes low, and the mixed liquid is almost completely separated into the low specific gravity liquid and the sedimented liquid.

  When the low specific gravity liquid reaches the separation plate 10d, the low specific gravity liquid flows into the low specific gravity liquid discharge space through the communication passage 10f and is discharged from the low specific gravity liquid discharge passage 11b.

  On the other hand, the settled sedimented liquid settles and accumulates at the bottom of the liquid passage 10h and is discharged to the outside through the sedimented liquid discharge passage 11a. When the sedimented liquid that has accumulated is discharged from the sedimented liquid discharge passage 11a, if the sedimented liquid is accumulated in a predetermined amount or more, the low specific gravity liquid is remixed with the sedimented liquid, or the low specific gravity liquid is mixed with the sedimented liquid. It is possible to prevent the liquid from flowing out of the settled liquid discharge passage 11a.

  As described above, according to the separator 1 of the present embodiment, the low specific gravity liquid and the sedimented liquid in the mixed liquid can be effectively separated, and the low specific gravity liquid and the sedimented liquid can be separated and recovered.

(Other examples of the inflow passage 14)
In the above example, the case where the inflow passage 14 is a tubular member disposed on the side surface of the trunk portion 11 has been described. However, as shown in FIG. 3, the front end panel 12 is tubular so that its axial direction is substantially parallel to the axial direction of the liquid passage 10h, or the angle formed between the axial direction and the axial direction of the liquid passage 10h is small. A member may be provided, and this tubular member may be used as the inflow passage.
In this case, it is preferable to provide a region where the hole is not formed (hereinafter referred to as the collision portion LF) in a part of the upstream side rectifying member 21 (FIG. 3B). Specifically, the collision portion LF is formed so as to cross the axial extension line of the inflow passage and have an area larger than the cross-sectional area of the inflow passage. Then, most of the mixed liquid flowing in from the outside through the inflow passage collides with the collision portion LF of the upstream rectifying member 21, so that the settling member 23 does not interfere with the upstream rectifying member 21 and the downstream rectifying member 22. The mixed liquid reaching up to can be eliminated. Therefore, it is possible to maintain the function of reducing the difference in the mixing ratio and the flow rate of the mixed liquid depending on the position in the cross section of the liquid passage 10h by the upstream rectifying member 21 and the upstream rectifying member 22.

(Another example of the sedimentation member 23)
In the above example, the case where the sedimentation member 23 has a plurality of through holes 23h has been described. However, the sedimentation member has a structure capable of separating the mixed liquid into a low specific gravity liquid and a sedimentation liquid while passing through the position of the sedimentation member. The structure is not limited to the above structure as long as it is included. That is, any structure may be used as long as the flow rate of the mixed liquid can be reduced to some extent when passing through the position of the settling member and the settling distance of the settling liquid can be shortened.
For example, as the sedimentation member, a plurality of plate-like members may be arranged along the vertical direction so as to be in a state of being spaced apart, and the sedimentation member may be used.

  Next, a numerical simulation was performed on the flow of the mixed liquid in the liquid passage and the water volume ratio in the mixed liquid in the case where the mixed liquid obtained by mixing two kinds of liquids having different specific gravities is separated by the sedimentation type liquid-liquid separator.

  The numerical simulation was performed for the sedimentation type liquid-liquid separator (Example) of the present invention having the structure of FIG. 1 and the sedimentation type liquid-liquid separator (Comparative Example) having the structure of FIG.

  Calculation was performed by ANSYS CFX. The calculation conditions are as follows.

(1) Mixed liquid Mixed liquid: Flow rate of mixed liquid mixed liquid of oil (density 900 kg / m ³ , viscosity 1.5 cP) and water (density 970 kg / m ³ , viscosity 0.4 cP): 70 m ³ / h
Flow rate ratio: Water: Oil = 1: 2
Water particle size: 180μm

(2) Body length (including end plate): 7600mm
Length from the inner surface of the front end panel to the separation plate: 6300 mm
Inner diameter: 1800mm
Separation plate height: 1550mm
Inflow passage diameter: 300mm
The side opening (only the embodiment) is formed by removing a portion having an axial length of 200 mm and a radial direction (left and right direction in FIG. 1) of 100 mm on the side surface of the inflow passage.

(3) Rectification member
(i) Example upstream flow regulating member: 30% aperture ratio in the upper region, 10% aperture ratio in the lower region
Area ratio of upper region and lower region: Upper region: Lower region = 1: 5
Downstream flow straightening member: Opening ratio 30%
(ii) Comparative example rectifying member: 30% aperture ratio
In the calculation, calculation was performed by installing an object having a pressure loss corresponding to the opening ratio, instead of installing a porous plate as shown in FIGS. 2 and 4 as the rectifying member.

(4) Settling member
(i) Example cross-sectional shape of through hole: 80 mm × 80 mm
Length: 3000mm
(ii) Comparative example length: 3000mm
Distance between sinking members: 400mm

5 and 6 show the results of numerical simulation.
Note that in FIGS. 5B and 6B, the darker regions indicate the regions with a large water volume ratio.

  As shown in FIG. 5A, in the comparative example, since the size of the through holes 121h of the rectifying member 121 are all the same, on the downstream side of the rectifying member 121, from the vicinity of the inner surface of the trunk portion 111, It can be confirmed that there is a circulating flow toward the center. Due to the influence of this circulating flow, there is a difference in the flow velocity of the liquid flowing between the settling members 123 between the portion located near the center of the trunk 111 and the peripheral portion.

  On the other hand, as shown in FIG. 6A, in the embodiment, no circulating flow is generated on the downstream side of the downstream rectifying member 22. In addition, since water flows while sinking downward, the flow velocity at the lower part is higher than that at the other parts on the downstream side of the downstream rectifying member 22, but the flow rate is almost the same in the other parts than the lower part. It's getting late. Even when passing through the settling member 23, the difference in the flow velocity of the mixed fluid passing between the through holes 23h is small.

  As described above, in the separator of the example, it can be confirmed that the flow velocity of the mixed liquid flowing in the settling member 23 can be made substantially uniform in the cross section.

  Further, as shown in FIG. 5B, in the separator of the comparative example, on the downstream side of the rectifying member 121, the water volume ratio is moderated from 0.25 to 0.05, and the water volume ratio is It can be confirmed that it gradually changes toward the top. That is, on the downstream side of the rectifying member 121, the difference due to the position of the water volume ratio in the trunk portion 111 is large.

  On the other hand, as shown in FIG. 6B, in the separator of the embodiment, the water volume ratio changes in a narrow range from 0.25 to 0.05 on the downstream side of the downstream rectifying member 22. That is, on the downstream side of the downstream rectifying member 22, the water volume ratio in the body portion 11 is within the cross section of the body portion 11 as compared with the separator of the comparative example, except in the vicinity of the portion where water is accumulated. It can be confirmed that the difference due to the position is small.

  As described above, in the separator of the example, it can be confirmed that the difference due to the position of the mixing ratio of the mixed liquid supplied to the settling member 23 can be reduced in the cross section of the body portion 11.

  When the water recovery rates of the separator of the example and the separator of the comparative example are compared, it is about 0.86 for the separator of the comparative example and about 0.96 for the separator of the example. That is, it was confirmed that by adopting the separator of the example, the water recovery rate can be greatly improved, in other words, oil and water can be separated efficiently.

  The sedimentation type liquid-liquid separator of the present invention is suitable for separation of a mixed liquid in a chemical plant, a processing apparatus or the like, and is particularly suitable as a separator in equipment for performing a separation process continuously.

DESCRIPTION OF SYMBOLS 1 Sedimentation type liquid-liquid separator 10 Main part 10h Liquid passage 11 Body 11a Low specific gravity liquid discharge passage 11b Precipitation liquid discharge passage 14 Inflow passage 21 Upstream rectification member 22 Downstream rectification member 23 Settling member 23h Through hole LF Collision part

Claims (4)

An apparatus for separating a mixed liquid obtained by mixing liquids having different specific gravities by forming an interface,
A hollow cylindrical body portion having a liquid passage inside, an inflow passage provided at the front end of the body portion for supplying a mixed liquid to the liquid passage of the body portion, and a separation provided at the rear end of the body portion A discharge passage for discharging the liquid that has been discharged from the body portion;
In the main body, a sedimentation member that sediments a liquid having a large specific gravity in the mixed liquid;
In the main body portion, the rectifying member provided between the settling member and the inflow passage,
The rectifying member is
An upstream rectifying member in which a plurality of through holes having different hole diameters are formed;
It is arranged on the settling member side with respect to the upstream rectifying member, and includes a downstream rectifying member in which a through hole having a uniform hole diameter is formed,
The through hole of the upstream rectifying member is
A sedimentation type liquid-liquid separator, characterized in that the sizes of the through holes formed in the upper part and the lower part are different. The inflow passage is
The sedimentation type liquid-liquid separator according to claim 1, wherein the liquid mixture is arranged to be supplied from a direction along an axial direction of the liquid passage toward an inner surface of a front end of the body portion. . The upstream rectifying member is
2. The sedimentation type liquid-liquid separator according to claim 1, further comprising a collision portion that does not allow liquid to permeate at a portion intersecting with an axial extension line of the inflow passage. The inlet of the inflow passage is
4. The liquid passage of the trunk portion is disposed at a position where a free surface of the liquid having a large specific gravity that has settled in the liquid passage is formed. The settling liquid-liquid separator as described.