JP2009178654A - Liquid/liquid separator of sedimentation type - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid/liquid separator of a sedimentation type capable of separating a liquid mixture comprising liquids each having a mutually different specific gravity, particularly a liquid mixture wherein a liquid of a lower specific gravity is present in a higher ratio relative to a liquid of a higher specific gravity. <P>SOLUTION: The liquid/liquid separator of a sedimentation type for separating a liquid mixture wherein a liquid of a higher specific gravity than that of a principal liquid is dispersed in the principal liquid of a low specific gravity forming interfaces therebetween, into the respective liquids, comprises: a body 10 equipped with a cylindrical barrel 11 having a liquid passage 10h disposed thereinside, an inflow passage 12a disposed on the front end of the barrel 11 for feeding the liquid mixture into the liquid passage 10h of the barrel 11, and a discharge passage 11a disposed on the rear end of the barrel 11 for discharging the separated liquid from the barrel 11; a sedimentator 21 that causes the liquid of a higher specific gravity present in the liquid mixture to sink in the body 10; and a distributor 22 disposed between the sedimentator 21 and the inflow passage 12a in the body 10. The sedimentator 21 is equipped with a sedimentation face 21s not ascending from the upstream side toward the downstream side. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 an oil / water separation device in which a partition member is provided in an oil / water separation tank to meander a flow path. This technology promotes the separation of oil and water by causing the mixed liquid to collide with the partition member, and promotes gravity sedimentation of the oil and water separation by meandering the flow path to reduce the flow rate of the mixed liquid.

  Patent Document 2 discloses a suspension separator that includes a current plate and an inclined flow channel assembly having an inclined flow channel that is inclined with respect to the flow channel, both of which are provided in a mixed liquid flow channel. Has been. In this apparatus, the mixed liquid is converted into a parallel laminar flow by the rectifying plate, and the mixed liquid that has become the parallel laminar flow is caused to flow into the inclined flow path so that the suspended fluid having a large specific gravity is settled and separated. This document also describes that the inclined flow path of the inclined flow path assembly is changed depending on the relative specific gravity of the dispersion medium and the suspended fluid.

  However, in the technique of Patent Document 1, since the partition member is provided so as to be orthogonal to the flow direction of the mixed liquid, the flow resistance is large and the processing efficiency for continuously separating the mixed liquid into each liquid is high. Lower.

  On the other hand, in the technique of Patent Document 2, since the flow path for settling and separating the suspended fluid is an inclined flow path, the flow path resistance can be reduced as compared with the technique of Patent Document 1, but there are the following problems.

First, in Patent Document 2, a liquid having a specific gravity smaller than that of the main liquid (hereinafter referred to as a sedimented liquid) is mixed with a liquid having a low specific gravity (hereinafter simply referred to as a main liquid). There is a description that an inclined channel assembly having an inclined channel inclined upward with respect to the flow direction is used. In such a case, the settled liquid settles in the inclined channel and is discharged so as to slide down the slope of the inclined channel, but the direction in which the settled liquid slides down the tilt is opposite to the direction of the flow of the mixed liquid. Then, the settled liquid must move against the flow of the mixed liquid, and the discharge efficiency for discharging the settled liquid from the inclined flow path is reduced. There is a possibility of remixing into the main liquid.
Moreover, in the technique of Patent Document 2, since the main liquid is sucked from the rear end of the inclined flow path, if the discharge efficiency for discharging the settling liquid is reduced, the settling liquid is likely to be sucked together with the main liquid. In this case, the separated main liquid and the settled liquid are reliably remixed.

  Patent Document 2 also describes an example in which the inclined channel is inclined downward with respect to the flow direction of the mixed liquid. In this configuration, in a mixed liquid in which a liquid having a large specific gravity (hereinafter simply referred to as a main liquid) is mixed with a liquid having a specific gravity smaller than that of the main liquid (hereinafter referred to as a floating liquid), the floating liquid is converted from the main liquid. It is described that it is used for separation and removal. In such a configuration, the floating liquid floating in the inclined flow path rises along the upper surface of the inclined flow path and is discharged from the inclined flow path. In this case as well, the moving direction of the floating liquid and the mixed liquid The direction of the flow is reversed. Then, the floating liquid must move against the flow of the mixed liquid, the discharge efficiency for discharging the floating liquid from the inclined flow path is reduced, and the floating liquid and the main liquid may be remixed. is there.

JP 2001-252503 A Japanese Patent No. 3681003

  In view of the above circumstances, the present invention provides a sedimentation type liquid-liquid separator capable of efficiently separating a mixed liquid in which liquids having different specific gravities are mixed, particularly a mixed liquid having a large proportion of fluid having a small specific gravity, into each liquid. With the goal.

A sedimentation type liquid-liquid separator according to a first aspect of the present invention is an apparatus for separating a mixed liquid obtained by mixing a main liquid having a low specific gravity with a liquid having a higher specific gravity than the main liquid by forming an interface, and separating the liquid into each liquid. A hollow cylindrical body having a liquid passage, an inflow passage provided at the front end of the body and supplying a mixed liquid to the liquid passage of the body, and provided at the rear end of the body and separated. A main body provided with a discharge passage for discharging the liquid from the body, a settling member for settling a liquid having a large specific gravity in the mixed liquid in the main body, and the settling member and the inflow passage in the main body. The sinking member is provided with a sinking surface that is not inclined upward from the upstream side to the downstream side.
A sedimentation type liquid-liquid separator according to a second invention is characterized in that, in the first invention, the sedimentation surface is inclined downward from the upstream side toward the downstream side.
The sedimentation type liquid-liquid separator according to a third aspect of the invention is characterized in that, in the first or second aspect of the invention, the sedimentation member is a plate-like inclined plate disposed so that the upper surface thereof becomes the sedimentation surface. To do.
The sedimentation type liquid-liquid separator according to a fourth aspect of the present invention is the first, second or third aspect of the present invention, wherein the rectifying member is provided with a collision portion which does not allow fluid to permeate at a portion intersecting with the axial extension line of the inflow passage. It is characterized by having.
According to a fifth aspect of the present invention, there is provided the sedimentation type liquid-liquid separator according to the fourth aspect, wherein the inflow passage is provided below the main body and the axial direction thereof is inclined upward with respect to the liquid passage. It is characterized by being arranged.
A sedimentation type liquid-liquid separator according to a sixth aspect of the present invention is the first, second, third, fourth or fifth aspect, wherein the discharge passage is a liquid having a high specific gravity provided at a lower rear end of the body portion. A lower discharge passage for discharging is provided, and a gap is formed between a lower end of the rectifying member and a lower inner surface of the main body.

According to the first invention, if the mixed liquid is brought close to the laminar flow state by the rectifying member, the separation of the mixed liquid is promoted, and after passing through the rectifying member, the liquid having a large specific gravity (sedimented liquid) gradually settles, In the region where the settling member is provided, the settled settling liquid adheres to the settling surface of the settling member. The settling liquid adhering to the settling surface coalesces on the settling surface, but the settling surface of the settling member is not inclined upward from the upstream side to the downstream side, so the mixed liquid pushes the mixed liquid on the settling surface. And the sedimentation liquid can be efficiently discharged from the sedimentation member. Therefore, the liquid separation efficiency in the sedimentation member can be increased, and the separated sedimentation liquid and the main liquid having a small specific gravity can be prevented from being mixed again.
According to the second invention, the settled liquid adhering to the settling surface moves so that the moving direction of the settling liquid slides down the settling surface along the same direction as the moving direction of the mixed liquid. The efficiency of discharging can be further increased. In addition, since the settled liquid moves by its own weight along the same direction as the moving direction of the mixed liquid, the resistance of pushing the mixed liquid on the settled surface by the mixed liquid becomes smaller. Then, it can prevent more effectively that the separated sedimentation liquid and the main liquid with small specific gravity are mixed again.
According to the third invention, the sedimentation member is a plate-like member, and the upper surface thereof is disposed to be the sedimentation surface. Then, the flow resistance of the mixed liquid can be reduced as compared with the case where the plate-like member is disposed so as to be orthogonal to the flow direction of the mixed liquid, and the processing efficiency can be increased.
According to the fourth aspect of the present invention, it is possible to prevent the mixed liquid flowing in from the outside through the inflow passage from passing through the rectifying member. Therefore, the separation of the mixed liquid can be promoted before being supplied to the settling member. it can.
According to the fifth aspect of the present invention, since the mixed liquid that flows upward with respect to the inflow passage collides with the rectifying member, the settled liquid easily moves downward after the collision, so that the separation of the mixed liquid can be promoted. .
According to the sixth aspect of the invention, it is possible to prevent the settled liquid from collecting on the upstream side of the rectifying member, so that the treatment can be performed continuously for a long period of time.

Next, an embodiment of the present invention will be described with reference to the drawings.
The sedimentation type liquid-liquid separator of the present embodiment is a mixture in which a liquid having a specific gravity greater than that of a main liquid such as water or alcohol (hereinafter referred to as a precipitation liquid) is mixed with a main liquid having a small specific gravity such as oil. It is an apparatus that separates a liquid into liquids, and is suitable for equipment that needs to continuously process a mixed liquid, such as a chemical plant or a processing apparatus.

  FIG. 1 is a schematic cross-sectional view of a sedimentation type liquid-liquid separator of this embodiment. 2A is a cross-sectional view taken along line AA in FIG. 1, FIG. 2B is a cross-sectional view taken along line BB in FIG. 1, and FIG. 2C is a schematic plan view of the settling member 21. It is.

  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 including a hollow cylindrical body 11 and end plates 12 and 13 provided at both ends of the body 11 in the axial direction. For example, when the separator 1 of the present embodiment is used in a chemical plant, the main body 10 has an inner diameter of the body 11, that is, a diameter of the liquid passage 10h of about several meters, and an axial length. However, the main body 10 is not particularly limited in size as described above, and can be freely determined depending on the amount of liquid to be processed, physical properties, and the like.

An inflow passage 12 a for supplying a mixed liquid into the main body 10 is provided at a lower portion of a end plate 12 (hereinafter referred to as a front end end plate 12) provided at the left end (front end) of the body portion 11. The inflow passage 12a is formed so that the inner diameter thereof is smaller than the diameter of the body portion 11 and is about 1/3 or less of the inner diameter of the body portion 11.
A gas discharge part 11b is provided above the front end of the body part 11. The gas discharge part 11b 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.

  On the other hand, discharge passages 11 a and 13 a for discharging liquid from the inside of the main body 10 to the outside are provided at the right end of the main body 10.

  An upper discharge passage 13a is disposed at an upper portion of a mirror plate 13 (hereinafter referred to as a rear end mirror plate 13) provided at the right end (rear end) of the body portion 11. The upper discharge passage 13a is a passage for discharging the main liquid having a small specific gravity contained in the mixed liquid, and the main liquid is always discharged to the outside.

  A lower discharge passage 11a is provided at the lower right end (rear end) of the body portion 11. The lower discharge passage 11a is a passage for discharging the sedimented fluid separated from the main liquid to the outside. The lower discharge passage 11a is provided with a device (for example, a valve) that can cut off communication between the inside of the main body 10 and the outside, and discharges the sedimented fluid from the lower discharge passage 11a every predetermined period. It is like that. Specifically, the settled liquid is discharged to the outside from the lower discharge passage 11a when a certain amount is accumulated in the lower portion of the liquid passage 10h. In this case, since the lower discharge passage 11a is communicated with the liquid passage 10h in a state where the lower discharge passage 11a is covered with the settled liquid accumulated in the lower portion of the liquid passage 10h, the main liquid directly flows into the lower discharge passage 11a. It is possible to prevent the main liquid from flowing out from the lower discharge passage 11a.

  With the configuration as described above, if the mixed liquid is supplied from the inflow passage 12a at the front end of the main body 10, the mixed liquid flows in the main body 10 from the front end to the rear end, and from the discharge passages 11a and 13a at the rear end. The treated liquid can be discharged.

  Note that the main liquid discharged from the upper discharge passage 13a described above does not mean only the liquid that does not contain the precipitated liquid, but the precipitated liquid compared to the mixed liquid supplied from the inflow passage 12a. Needless to say, it includes those with a reduced ratio. For example, in the mixed liquid supplied from the inflow passage 12a, if the ratio of the precipitated liquid being mixed is about 3% in the flow rate ratio, the main liquid containing the precipitated liquid having a flow rate ratio of about 1% or less is It is included in the main liquid discharged from the upper discharge passage 13a in this specification. That is, the main liquid in which the ratio of the settling liquid mixed is lower by 60% or more than the ratio of the settling liquid in the mixed liquid supplied from the inflow passage 12a is also from the upper discharge passage 13a in this specification. Included in the main liquid discharged.

  As shown in FIG. 1, in the separator 1 of the present embodiment, a rectifying member 22 and a settling member 21 are provided in the liquid passage 10 h of the main body 10 in order to enhance the separation effect.

As shown in FIG. 1, the rectifying member 22 is provided at the front end portion of the body portion 11 of the main body portion 10. The rectifying member 22 is a plate-like member disposed so as to separate the body portion 11 into a front end portion and a rear portion, and a plurality of through holes 22h are formed (FIG. 2A).
For this reason, the mixed liquid supplied from the inflow passage 12a into the liquid passage 10h of the main body portion 10 passes through the plurality of through holes 22h of the rectifying member 22 and flows into the rear portion, so that the mixed liquid is brought close to a laminar flow state. In this state, it can flow toward the rear end of the trunk portion 11.

  The rectifying member 22 is not limited to the member as described above, and is not particularly limited as long as the flow rate of the mixed liquid can be made close to a uniform and close to a laminar flow state, and may be replaced with, for example, a wire mesh. .

  As shown in FIG. 1, two settling members 21 and 21 are provided between the flow straightening member 22 and the upper discharge passage 13a along the vertical direction in the liquid passage 10h. The two settling members 21 and 21 are plate-like members provided side by side so as to be parallel to each other, and are arranged such that the upper surface (sedimentation surface 21s) is horizontal.

Because of the above-described configuration, in the region where the two settling members 21 and 21 are provided in the liquid passage 10h, the mixed liquid is between the two settling members 21 and 21 and between the settling members 21 and the trunk portion 11. It flows between the inside. Then, since the distance between the two settling members 21 and 21 and the distance between each settling member 21 and the inner surface of the body portion 11 are sufficiently shorter than the diameter of the body portion 11, It is possible to reduce the distance (sedimentation distance) until the settled liquid comes into contact with the sedimentation surface 21s, the inner surface of the body portion 11, and the like.
Therefore, the settled liquid in the mixed liquid can be separated from the main liquid more quickly than in the case where the settling member 21 is not provided, and the settled liquid present in the mixed liquid cannot be sufficiently settled together with the main liquid. The possibility of being discharged from 13a can be reduced.
In addition, since the settled liquid can be brought into contact with not only the inner surface of the body 11 but also the settled surface 21s of the sedimentation member 21 to collect droplets, the settled liquid on the settled surface 21s may be mixed with the main liquid. Can be lowered.

  Further, the settled liquid that settles and collects on the settling surface 21s of the settling member 21 is directed toward the rear end of the settling member 21 by the mixed liquid flowing between the inner surface of the trunk portion 11 and the settling member 21 or between the settling members 21. It is pushed away and discharged from the rear end of the settling member 21. At this time, since the settling surface 21s of the settling member 21 is horizontal and the mixed liquid pushes down the settling liquid on the settling surface 21s, the settling liquid can be efficiently discharged from the settling member. It is also possible to prevent the liquid and the main liquid having a small specific gravity from being mixed again.

Further, as shown in FIG. 1, the settling member 21 is disposed such that the front end (left end in FIG. 1) is separated from the rectifying member 22 by a certain distance.
For this reason, the mixed liquid that has passed through the rectifying member 22 is sufficiently laminarized before reaching the position of the settling member 21, so that the sedimentation of the settling fluid in the region where the settling member 21 is provided is smoothly performed. Can be done.
Moreover, since the sedimentation member 21 is installed such that its rear end (right end in FIG. 1) is separated from the upper discharge passage 13a by a certain distance, the sedimentation liquid discharged from the rear end of the sedimentation member 21. Can be prevented from flowing into the upper discharge passage 13a together with the main liquid.

  In addition, although the cross-sectional shape of the sedimentation member 21 is not particularly limited, as shown in FIG. 2B, it may be formed in a V-shaped cross-sectional view in which the center in the width direction (the width direction of the main body portion 10) is recessed. For example, the settled liquid adhering to the settled surface 21s flows toward the center in the width direction while flowing from the front end of the main body 10 toward the rear end. Then, since the sedimentation liquid flowing on the sedimentation surface 21s can be quickly combined, the possibility that the sedimentation liquid floats from the sedimentation surface 21s and is remixed with the main liquid can be further reduced.

  Furthermore, as shown in FIG. 2 (C), if a hole 21h penetrating the front and back is formed at an appropriate position of the settling member 21, the settling liquid flowing through the settling surface 21s can be quickly moved downward, It is possible to prevent the amount of the settled liquid accumulated on the settled surface 21s from being excessively increased. Then, it is possible to reduce the sedimentation liquid on the sedimentation surface 21s from becoming a resistance to the flow of the mixed liquid, and the sedimentation liquid and the liquid mixture on the sedimentation surface 21s interfere with each other, and the separated sedimentation liquid and the main liquid are separated. Can also be prevented from remixing.

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 12a to the liquid passage 10h in the main body 10. Since the liquid passage 10h has a larger cross-sectional area than the inflow passage 12a, the flow rate of the mixed liquid decreases. The precipitated liquid forms an interface in the mixed liquid and is mixed in the form of droplets. However, the precipitated liquid tends to settle due to a decrease in the flow rate of the mixed liquid.
In addition, since the mixed liquid is brought close to the laminar flow state by passing through the rectifying member 22, the settled liquid is more likely to settle.

The mixed liquid that has passed through the rectifying member 22 and the sedimented liquid has easily settled passes through the region where the sedimentation member 21 is provided. At this time, the settled liquid flows from the front end to the rear end of the main body 10 while sinking in the mixed liquid, and comes into contact with the settling surface 21 s of the settling member 21 and the inner surface of the body 11. Then, the settled liquid that contacts the settled surface 21s or the like adheres to the settled surface 21s or the like and cannot follow the flow of the main liquid in the mixed liquid, and is separated from the main liquid of the mixed liquid.
Since the separation of the settled liquid proceeds while passing through the region where the settling member 21 is provided, as the mixed liquid flows toward the rear end of the settling member 21, the ratio of the settled liquid in the mixed liquid increases. It gradually decreases. Then, when the mixed liquid is discharged from the settling member 21, the ratio of the settling liquid mixed with the main liquid is low. Then, when the main liquid in which the ratio of the settled liquid is reduced reaches the rear end of the main body 10, the main liquid is discharged from the upper discharge passage 13a.

On the other hand, the settled liquid that has settled and contacted the inner surface of the body portion 11 moves to the rear end bottom portion of the main body portion 10 while collecting on the inner surface of the main body portion 10. Further, the settled liquid that has come into contact with the sedimentation surface 21s of the sedimentation member 21 moves toward the rear end of the sedimentation member 21 while gathering on the sedimentation surface 21s of the sedimentation member 21, and reaches the rear end of the sedimentation member 21. . Then, it settles downward from the rear end of the settling member 21 and eventually accumulates at the bottom end of the main body 10.
Then, since the amount of the sedimented liquid accumulated at the bottom of the rear end of the main body 10 increases with the passage of time, when the sedimented liquid accumulates more than a predetermined amount, the liquid passage 10h passes between the liquid passage 10h and the outside through the lower discharge passage 11a. , Only the sedimentary fluid can be discharged from the lower discharge passage 11a. Then, if the accumulated sedimentation fluid is appropriately discharged from the lower discharge passage 11a, the excessively accumulated sedimentation liquid is remixed with the main liquid, or the sedimentation liquid flows out from the upper discharge passage 13a together with the main liquid. Can be prevented.

  As described above, according to the separator 1 of the present embodiment, a precipitated liquid having a large specific gravity can be effectively separated from a main liquid having a small specific gravity in the mixed liquid, and the precipitated liquid is remixed into the main liquid. Can be prevented.

In the above example, the case where the settling surface 21s of the settling member 21 is disposed horizontally has been described. However, as shown in FIG. 4, the settling surface 21s tilts downward from the front end toward the rear end of the main body 10. It may be arranged like this. In other words, the sedimentation surface 21s may be disposed so as to incline downward from the upstream side toward the downstream side along the flow direction of the mixed liquid.
Even when the settling surface 21s of the settling member 21 is configured as described above, the settling liquid gathered on the settling surface 21s of the settling member 21 is pushed and moved by the flow of the mixed liquid. It moves so as to slide down on the settling surface 21s toward the rear end of the main body 10 by its own weight. Then, the direction in which the sedimentation member 21 moves under its own weight and the movement direction of the sedimentation liquid and the movement direction of the mixed liquid flowing between the sedimentation members 21 are the same direction. The settled liquid can be discharged efficiently and quickly from the rear end of the member 21.
Moreover, the settling member 21 is disposed so as to be inclined downwardly from the front end to the rear end of the main body 10, but the downward inclination angle is at most 3 to 15 with respect to the axial direction of the main body 10. Degree. Then, compared with the case where a plate-like member is disposed so as to be orthogonal to the flow direction of the mixed liquid, an increase in flow resistance due to the presence of the settling member 21 can be suppressed, so that the processing efficiency of the mixed liquid Can be high.

Moreover, although the case where the two sedimentation members 21 are provided is shown in the above example, the number of the sedimentation members 21 is not particularly limited, and may be one or three or more.
The sedimentation member 21 is not limited to the plate-shaped member as described above, and is an upper surface that is not inclined upward from the upstream side to the downstream side in the flow direction of the mixed liquid (non-upwardly inclined upper surface), that is, Any member having a horizontal upper surface or an upper surface inclined downward from the upstream side toward the downstream side along the flow direction of the mixed liquid can be employed. For example, a cylindrical member arranged horizontally, a cylindrical member inclined downward from the upstream side to the downstream side along the flow direction of the mixed liquid, or the like can be used.

Further, the rectifying member 22 may be disposed such that the lower end thereof is in contact with the inner surface of the lower portion of the trunk portion 11 of the main body portion 10, but there is a gap between the lower end thereof and the inner surface of the lower portion of the trunk portion 11 of the main body portion 10. You may arrange | position so that 22a may be formed (refer FIG. 2 (A)).
In the separator 1, the settled liquid settles not only on the downstream side of the rectifying member 22 but also on the upstream side of the rectifying member 22. For this reason, when the lower end of the rectifying member 22 and the inner surface of the lower portion of the trunk portion 11 are connected, there is a possibility that the settled liquid is accumulated on the upstream side of the rectifying member 22. In this case, there is a possibility that the accumulated sedimented liquid may be mixed with the mixed fluid supplied from the inflow passage 12a. Then, in addition to the lower discharge passage 11a, a means for discharging the settled liquid must be provided at the front end lower portion of the body portion 11, and if such means is not provided, a removal operation for discharging the settled liquid is performed. The equipment must be shut down.
However, as shown in FIG. 2A, if the gap 22a is formed, the settled liquid that has settled on the upstream side of the rectifying member 22 also follows the flow of the mixed fluid on the inner surface of the lower portion of the main body 10. Therefore, it is possible to prevent the settled liquid from being accumulated upstream of the rectifying member. Then, since it is not necessary to stop the facility to perform the operation of discharging the sedimented liquid accumulated on the upstream side of the rectifying member 22, the treatment by the separator 1 can be performed continuously for a long period of time. Moreover, since it is not necessary to provide a means for discharging the settled liquid accumulated at the position of the rectifying member 22, the structure of the separator 1 can be simplified.

Further, as shown in FIG. 2A, a region where the hole is not formed (hereinafter referred to as a collision portion LF) may be provided in a part of the rectifying member 22. In this case, the collision part LF is formed at a position intersecting with the axial extension line of the inflow passage 12a so that the area thereof is larger than the cross-sectional area of the inflow passage 12a.
Then, most of the mixed liquid flowing in from the outside through the inflow passage 12a collides with the collision portion LF of the rectifying member 22, so that separation of the main liquid and the settled liquid is promoted. Moreover, since the mixed liquid that passes through the through-hole without interfering with the rectifying member 22 can be eliminated, laminar flow of the mixed liquid and separation of the main liquid and the precipitated liquid can be further performed before being supplied to the settling member. It can be further promoted.

  Further, if the inflow passage 12a is arranged so that the axial direction thereof is inclined upward with respect to the liquid passage 10h, the mixed liquid flowing in from the inflow passage 12a and the rectifying member 22 are directed upward with respect to the liquid passage 10h. collide. Then, after the collision with the rectifying member 22, the main liquid easily moves upward, while the settled liquid easily moves downward, so that the separation of the mixed liquid can be further promoted. The angle at which the inflow passage 12a is inclined upward is preferably about 10 to 30 degrees with respect to the axial direction of the main body 10 for the separation of the mixed liquid.

  Further, as shown in FIG. 1, it is preferable that the upper discharge passage 13 a is formed of a cylindrical member, and is arranged so that one end thereof is a protruding portion 13 p protruding from the inner surface of the rear end panel 13. In this case, the settled liquid accumulated at the bottom end of the main body 10 moves following the flow of the main liquid toward the upper discharge passage 13a and flows toward the upper discharge passage 13a along the inner surface of the rear end end plate 13. In addition, it is possible to prevent the settled liquid from leaking into the upper discharge passage 13a. Specifically, since the opening at one end of the upper discharge passage 13a is disposed at a position away from the inner surface of the rear end panel 13, even if the settled liquid flows to the position of the protruding portion 13p, the settled liquid Cannot reach the position of the opening, and it is possible to prevent the settled liquid from leaking into the upper discharge passage 13a.

  If the length in the axial direction of the projecting portion 13p of the upper discharge passage 13a, that is, the length from the inner surface of the rear end end plate 13 to the front end of the projecting portion 13p is about 100 to 500 mm, the inner surface of the rear end end plate 13 Therefore, it is possible to sufficiently prevent the settled liquid from leaking into the upper discharge passage 13a.

  Furthermore, as shown in FIGS. 3 (A) and 3 (B), instead of causing the upper discharge passage 13a to protrude from the inner surface of the rear end end plate 13, a settling liquid is directed to the inner surface of the rear end end plate 13 toward the upper discharge passage 13a. A blocking wall 13w may be provided to block the flow of water. Even in this case, if the blocking wall 13w is formed so as to surround the periphery of the opening of the upper discharge passage 13a formed on the inner surface of the rear end panel 13, the upper discharge passage 13a is formed in the same manner as in the case of forming the protrusion 13p. It is possible to prevent the settled liquid from leaking inside.

The blocking wall 13w is not necessarily arranged so as to surround the periphery of the opening of the upper discharge passage 13a. For example, as shown in FIG. 3C, the blocking wall 13w is provided below the upper discharge passage 13a. May be erected. If the blocking wall 13w is provided so as to block the flow of the settled liquid from the lower side along the inner surface of the rear end end plate 13, the sedimented liquid once settled can be prevented from leaking into the upper discharge passage 13a.
However, with the blocking wall 13w having such a configuration, when the flow rate of the mixed liquid is high or when a large amount of mixed liquid flows, there is a possibility that the settled liquid will flow around the blocking wall 13w and leak into the upper discharge passage 13a. Cannot be denied.
Therefore, the blocking wall 13w configured as shown in FIG. 3 (C) is preferably used when the mixed liquid is used under such a condition that the flow velocity of the mixed liquid is low and the stagnation of the settled liquid does not occur.

  Next, a numerical simulation was performed on the flow and concentration distribution of the mixed liquid in the liquid passage when the mixed liquid obtained by mixing two kinds of liquids having different specific gravities was separated by the sedimentation type liquid-liquid separator of the present invention.

  In the numerical simulation, the sedimentation type liquid-liquid separator of the present invention having the structure of FIG. 1 (separator having a sedimentation member whose sedimentation surface is horizontal), the sedimentation type liquid-liquid separator of the present invention having the structure of FIG. A separator having a sedimentation member whose surface is inclined downward) and a separator (comparative example) in which the rectification member and the sedimentation member were removed from the sedimentation type liquid-liquid separator of the present invention.

Calculation was performed by ANSYS CFX. The calculation conditions are as follows.
Mixed liquid: Oil (density 600-700kg / m ³ , viscosity 0.2-0.4cp) and water mixed liquid Mixing ratio: Reynolds number of mixed fluid in which 2% water is mixed with oil at a flow rate ratio: Inlet about 1300,000 , Liquid passage average about 200,000
Water droplet diameter: 100μm, 200μm

5, 6 and 7 show the results of the numerical simulation.
FIG. 5 is a calculation result of the situation in the separator of the comparative example, (A) is the flow velocity distribution, (B) is the water concentration distribution when the droplet diameter is 100 μm, and (C) is the case when the droplet diameter is 200 μm. It is a calculation result of the concentration distribution of water in. FIG. 6 shows the calculation results of the situation in the separator of the present invention where the sedimentation surface is horizontal, (A) is the flow velocity distribution, (B) is the water concentration distribution when the droplet diameter is 100 μm, and (C) is the liquid. It is a calculation result of the concentration distribution of water when the droplet diameter is 200 μm. FIG. 7 is a calculation result of the situation in the separator of the present invention in which the sedimentation surface is inclined downward, (A) is the flow velocity distribution, (B) is the water concentration distribution when the droplet diameter is 100 μm, (C ) Is the calculation result of the water concentration distribution when the droplet diameter is 200 μm.
In FIGS. 5B, 5C, 6B, 6C, 7B, and 7C, the darker color region indicates the higher water concentration region.

As shown in FIG. 5A, in the comparative example, it can be confirmed that the liquid flowing in from the inlet flows to the middle of the separator with a certain speed.
On the other hand, as shown in FIGS. 6 (A) and 7 (A), in the separator of the present invention, the liquid flowing in from the inlet is blocked by the rectifying member and the rear thereof is a region where the flow velocity is low. I can confirm that.
From this, in the separator of the present invention, the flow velocity of the mixed liquid can be reduced uniformly in the cross section by providing the rectifying member, and the water settles before the mixed liquid is discharged. It can be confirmed that sufficient time is secured.

  Further, as shown in FIGS. 5B and 5C, in the comparative example, compared with the separator of the present invention, since the concentration difference depending on the position is small as a whole, the separation of water and oil is sufficiently performed. It can be confirmed that it is not. In addition, the high water concentration region is widely seen in the region from the front end to the middle in the upper part of the main body part and the rear end part of the main body part, and is slightly seen near the bottom inner surface of the main body part. It is presumed that they are not sufficiently separated from Moreover, at the rear end portion of the main body, there is a region with high water concentration around the upper discharge passage, so it is expected that the flow rate of water discharged together with oil will increase. In the calculation result of this time, in the comparative example, the flow rate of water discharged together with oil is about 1% in the flow rate ratio when the droplet diameter is 100 μm, and 1 when the droplet diameter is 200 μm. %.

On the other hand, as shown in FIGS. 6B and 6C, in the separator according to the present invention in which the sedimentation surface is horizontal, a portion with a high concentration and a portion with a low concentration are distinct depending on the position regardless of the diameter of water droplets. It can be confirmed that water and oil are sufficiently separated. In addition, the high water concentration region appears on the upper surface of the sedimentation member and the bottom inner surface of the main body portion, and the low water concentration region represents the upper portion of the main body portion and the sedimentation member at the rear from the position where the sedimentation member is provided. It appears in the vicinity of the lower surface. From this, it can be confirmed that the separation of water and oil is promoted by the sedimentation member, and the sedimentation of water is proceeding. Moreover, since the region where the water concentration is high extends from the front end to the rear end of the main body along the bottom inner surface of the main body, the effect of providing the rectifying member and the settling member allows the region from the front end side of the separator. It can be confirmed that the water is sufficiently separated.
Moreover, in the separator of the present invention in which the sedimentation surface is horizontal, the flow rate of water discharged together with oil is about 0.36% in the flow rate ratio when the droplet diameter is 100 μm, and when the droplet diameter is 200 μm. Is about 0.08%, and both are improved by 70% or more compared to the comparative example.

Furthermore, as shown in FIGS. 7B and 7C, even in the separator of the present invention in which the sedimentation surface is inclined downward, the high concentration portion and the low concentration portion are distinct depending on the position regardless of the water droplet diameter. It can be confirmed that water and oil are sufficiently separated. The high water concentration region appears on the upper surface of the sedimentation member and the bottom inner surface of the main body, as in the separator of the present invention where the sedimentation surface is horizontal, and the sedimentation member is provided in the low water concentration region. It appears in the upper part of the main body part in the rear from the position where it is located and in the vicinity of the lower surface of the settling member. In addition, the high water concentration region extends from the front end to the rear end of the main body along the bottom inner surface of the main body, and water from the front end side of the separator is obtained by the effect of providing the rectifying member and the settling member. It can be confirmed that the separation is sufficiently performed.
In particular, in the separator according to the present invention in which the sedimentation surface is inclined downward, compared to the separator according to the present invention in which the sedimentation surface is horizontal, a region in which the water concentration is high on the downstream upper surface of the sedimentation member and the downstream bottom inner surface of the main body. Is widely appearing. From this, it can be inferred that in the separator of the present invention in which the sedimentation surface is inclined downward, the sedimentation liquid is efficiently discharged from the rear end of the sedimentation member.
Moreover, in the separator of the present invention in which the sedimentation surface is inclined downward, the flow rate of water discharged together with the oil is about 0.25% in the flow rate ratio when the droplet diameter is 100 μm, and when the droplet diameter is 200 μm Is about 0.06%, which is improved by 80% or more compared to the comparative example, and is improved by 10% or more compared with the separator of the present invention in which the sedimentation surface is horizontal.

  As described above, the sedimentation type liquid-liquid separator of the present embodiment provided with the rectifying member and the sedimentation member has a high effect of separating the sedimentation liquid having a high specific gravity mixed with the main liquid from the main liquid having a small specific gravity. I can confirm.

  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, etc., and is particularly suitable as a separator in equipment for performing a separation process continuously.

It is a schematic sectional drawing of the sedimentation type liquid-liquid separator of this embodiment. (A) is the AA sectional view taken on the line of FIG. 1, (B) is the BB sectional view of FIG. 1, (C) is the schematic plan view of the sedimentation member 21. (A) is a schematic sectional view of a sedimentation type liquid-liquid separator provided with a blocking wall 13w, (B) is a sectional view taken along the line BB of (A), and (C) is a sectional view of the blocking wall 13w. It is the figure which showed an example. It is a schematic sectional drawing of the sedimentation type liquid-liquid separator of other embodiment. It is a calculation result of the situation in the separator of the comparative example, (A) is the flow velocity distribution, (B) is the concentration distribution of water when the droplet diameter is 100 μm, (C) is the water concentration when the droplet diameter is 200 μm. It is a calculation result of concentration distribution. It is the calculation result of the situation in the separator of the present invention where the sedimentation surface is horizontal, (A) is the flow velocity distribution, (B) is the concentration distribution of water when the droplet diameter is 100 μm, and (C) is the droplet diameter of 200 μm. It is a calculation result of the concentration distribution of water in the case of. It is a calculation result of the situation in the separator of the present invention in which the sedimentation surface is inclined downward, (A) is the flow velocity distribution, (B) is the water concentration distribution when the droplet diameter is 100 μm, and (C) is the liquid It is a calculation result of the concentration distribution of water when the droplet diameter is 200 μm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Settling type liquid-liquid separator 10 Main body part 10h Liquid passage 11 Body part 11a Lower discharge passage 12a Inflow passage 13a Upper discharge passage 21 Settling member 21s Settling surface 22 Rectification member LF Colliding part

Claims (6)

An apparatus for separating a mixed liquid obtained by mixing a main liquid having a small specific gravity with a liquid having a specific gravity larger than that of the main liquid 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 main body provided with a discharge passage for discharging the discharged liquid from the body,
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 settling member is
A sedimentation-type liquid-liquid separator, comprising a sedimentation surface that is not inclined upward from the upstream side toward the downstream side. The sedimentation type liquid-liquid separator according to claim 1, wherein the sedimentation surface is inclined downward from the upstream side toward the downstream side. The sedimentation type liquid-liquid separator according to claim 1 or 2, wherein the sedimentation member is a plate-like inclined plate disposed so that an upper surface thereof becomes the sedimentation surface. 4. The sedimentation-type liquid-liquid separator according to claim 1, wherein the rectifying member includes a collision portion that does not allow fluid to permeate at a portion that intersects with an axial extension line of the inflow passage. . 5. The sink according to claim 4, wherein the inflow passage is provided below the main body portion, and is arranged so that an axial direction thereof is inclined upward with respect to the liquid passage. Mold liquid-liquid separator. The discharge passage has a lower discharge passage for discharging a liquid having a large specific gravity provided at a lower rear end of the trunk portion.
6. The sedimentation type liquid-liquid separator according to claim 1, wherein a gap is formed between a lower end of the rectifying member and a lower inner surface of the main body.