TW202237251A - Oil-water separation device and oil-water separation method capable of reducing device height, operation loading during transportation and device cost - Google Patents

Abstract

The present invention provides an oil-water separation device and an oil-water separation method, which may reduce the device height, reduce the operation loading during device transpiration, and also reduce the cost of the device itself. The oil-water separation device 1 of the present invention comprises: a sealed container 2 which is divided into a first chamber 20 and a second chamber 21; a first coalescing device 3, which is disposed in the first chamber 20 for passing the mixture and capturing oil drops in the mixture and coarsening; a second coalescing device 4, which is disposed in the second chamber 21 for passing the mixture after passing the first coalescing device 3 and capturing oil drops in the mixture and coarsening; and, a nozzle 5, which is supported by a support plate 25 that divides the first chamber 20 into an upper space 20A and a lower space 20B, wherein the upper opening 51 of the nozzle 5 introduces the mixture from the upper space 20A, and the lower opening 50 discharges the mixture to the lower space 20B and is in a L-shape toward the horizontal direction.

Description

Oil-water separation device and oil-water separation method

The present invention relates to an oil-water separation device and an oil-water separation method, for example, for the treatment of separating oil components from a mixed liquid of water and oil in waste water such as bilge water in ships.

As a previous example of an oil-water separation device, a three-stage oil-water separation device 100 has been disclosed in Patent Document 1. As shown in FIG. A first chamber 103 of a coalescer 102 , a second chamber 105 with a second coalescer 104 below the first chamber 103 , and a third chamber 107 with a third coalescer 106 below the second chamber 105 . The first coalescer 102 , the second coalescer 104 , and the third coalescer 106 are filters each provided with a porous body, and the lower coalescers are equipped with filters with finer meshes.

In the oil-water separator 100 of Patent Document 1, the mixed liquid is supplied to the first chamber 103 in the airtight container 101, and the floating oil is first separated by the specific gravity difference. The mixed liquid from which the floating oil has been removed passes through the first coalescer 102. At this time, the large oil droplets turbid in the mixed liquid are captured by the first coalescer 102, and the captured oil droplets are combined and coarse-grained. Thereby, the coarse-grained oil droplets are detached from the first coalescer 102 and float up due to the increase of buoyancy, thereby being separated from the mixed liquid. The liquid mixture after passing through the first coalescer 102 is supplied to the second chamber 105 through the second coalescer 104 provided on the partition plate 108 which partitions the first chamber 103 and the second chamber 105 . At this time, the small oil droplets that are turbid in the mixed solution that are not captured by the first coalescer 102 are captured by the second coalescer 104, and the captured oil droplets are combined and coarse-grained. Thereby, the coarse-grained oil droplets are detached from the second coalescer 104 and float up due to the increase in buoyancy, thereby being separated from the mixed liquid. The liquid mixture after passing through the second coalescer 104 is supplied to the third chamber 107 through the third coalescer 106 provided on the partition plate 109 which partitions the second chamber 105 and the third chamber 107 . At this time, the smaller oil droplets that are turbid in the mixed solution that are not captured in the second coalescer 104 are captured by the third coalescer 106, and the captured oil droplets are combined and coarse-grained. Thereby, the coarse-grained oil droplets are detached from the third coalescer 106 and float up due to the increase of buoyancy, thereby being separated from the mixed liquid.

Also, the second chamber 105 is divided into an upper space and a lower space by a partition plate 113, and the mixed liquid after passing through the second coalescer 104 is supplied from the second chamber 105 to the The filter 112 returns to the second chamber 105 again through the inlet 111 connected to the lower space after the solid matter contained in the mixed liquid is removed in the filter 112 . Thereby, the mesh of the filter of the densest third coalescer 106 is prevented from being blocked by the solid matter contained in the mixed liquid. [Prior Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2005-288435

[Technical problem to be solved by the invention]

The oil-water separation device 100 of Patent Document 1 is a three-stage configuration of the first coalescer 102, the second coalescer 104, and the third coalescer 106, so there are the following problems: the height of the device must become higher, and The work load at the time of conveying the device increases, and furthermore, the cost of the device itself becomes high. Here, in order to reduce the height of the oil-water separation device, as shown in Figure 13, it is also conceivable to simply omit the second chamber (second coalescer) from the oil-water separation device, so that the mixed liquid passing through the first coalescer 102, It is formed by directly passing through the filter 102 and then passing through the third coalescer 106. However, in the oil-water separation device with the configuration shown in Fig. 13, the oil passes through the first coalescer 102 and accumulates under it while the oil is captured in the first coalescer 102. The inflowing water pushes the state of the oil layer, resulting in oil bubbles (the outside is oil and the inside is water) in the space below the first coalescer 102 of the first chamber 103, and the phenomenon that the space is full of oil bubbles occurs. Moreover, if the oil bubbles are supplied to the filter 112 and the third coalescer 106, the oil component will significantly increase the filtration resistance of the filter 112 to hinder the filtration process, or the filter of the third coalescer 106 will Issues such as clogging due to oil components.

An object of the present invention is to provide an oil-water separation device and an oil-water separation method capable of solving the above-mentioned problems. [Technical means]

The first aspect of the present invention relates to an oil-water separation device for floating and separating oil components from a mixed liquid of water and oil. The oil-water separation device of the present invention is characterized in that it has: a closed container, the inner space is divided into a first chamber and a second chamber up and down, and the mixed liquid is supplied to the first chamber; the first coalescer is connected to the aforementioned The first chamber is set to allow the mixed liquid to pass through, and the oil droplets in the mixed liquid are caught and coarsely granulated; the second coalescer is set in the aforementioned second chamber to allow the mixed liquid to pass through the aforementioned first coalescer , and the oil droplets in the mixed liquid are captured and coarsened; and the nozzle is supported on the support plate that divides the first chamber into the upper space on the side of the first coalescer and the lower space on the side of the second chamber , and the upper opening is for introducing the mixed liquid from the upper space, the lower opening is for leading the mixed liquid to the lower space, and the lower opening is L-shaped towards the horizontal direction.

In the oil-water separation device of the present invention, preferably, it can be configured to have the following characteristics: the flow velocity of the mixed liquid led from the lower opening of the nozzle to the lower space is 0.1 m/s to 2.0 m/s.

In addition, in the oil-water separation device of the present invention, preferably, it can be configured to have the following features: a filter is further provided to remove solids in the mixed liquid supplied from the aforementioned lower space; the aforementioned second coalescer includes A circular cylindrical coarse-grained filter is arranged laterally in the second chamber so that the axial direction of the coarse-grained filter extends in the horizontal direction, and is configured to be introduced into the hollow interior of the coarse-grained filter to pass through the filter. The mixture after the device.

In addition, in the oil-water separation device of the present invention, it is preferable to have the following characteristics: the flow velocity of the mixed liquid introduced into the hollow interior of the coarse-grained filter is not less than 0.1 m/s and not more than 1.0 m/s.

In addition, in the oil-water separation device of the present invention, preferably, it can be configured to have the following features: the aforementioned second coalescer further includes a diffuser pipe inserted into the hollow interior of the aforementioned coarse-grained filter, and is configured as Introduce the mixed liquid after passing through the filter into the hollow interior of the liquid dispersion pipe; the liquid dispersion pipe is formed with a plurality of liquid holes at intervals along its axial direction and circumferential direction.

In addition, in the oil-water separation device of the present invention, preferably, it can be configured to have the following characteristics: the flow rate of the mixed liquid leading out from the aforementioned liquid hole of the aforementioned diffuser pipe to the hollow interior of the aforementioned coarse-grained filter is 0.4 m/ More than 1.0m/s and less than 1.0m/s.

In addition, in the oil-water separation device of the present invention, preferably, it can be configured to have the following feature: the aforementioned coarse-grained filter is made of a hydrophobic material.

In addition, in the oil-water separation device of the present invention, preferably, it can be configured to have the following features: in the aforementioned airtight container, an insertion portion that allows the aforementioned second coalescer to be inserted laterally into the aforementioned second chamber is provided; the aforementioned second coalescer The knotter is to extend the axial direction of the coarse-grained filter in the horizontal direction through the installation mechanism and arrange it laterally in the second chamber; the installation mechanism includes at least two horizontally extending from the insertion part to the inside The parallel guide rails of the roots, and the pressing plate installed on the end of the aforementioned second coalescer that is inserted into the side of the aforementioned insertion part first; on the aforementioned pressing plate, at least two gaps are formed, and the aforementioned gap is used to accept the corresponding guide rail. The aforementioned pressing plate slides on the aforementioned at least two parallel guide rails, and limits the rotation of the aforementioned second coalescer in the circumferential direction.

The second aspect of the present invention relates to an oil-water separation method for floating a mixed liquid of water and oil to separate oil components. The oil-water separation method of the present invention is characterized in that it includes: a supplying step, the inner space of the airtight container is divided into upper and lower first chambers and second chambers and the aforementioned first chamber is divided into an upper space and a lower space by a support plate, And supply the mixed liquid in the aforementioned upper space of the aforementioned airtight container; the first coarse-graining step is to make the mixed liquid pass through the first coalescer installed in the aforementioned upper space and capture the oil droplets in the mixed liquid and coarse-grain; The step is to introduce the mixed liquid passing through the aforementioned upper space of the aforementioned first coalescer from the upper end opening of the L-shaped nozzle supported by the aforementioned support plate and export it from the aforementioned lower space toward the lower end opening in the horizontal direction to the aforementioned The lower space; and the second coarse granulation step, is to make the mixed solution in the lower space pass through the second coalescer installed in the second chamber and capture the oil droplets in the mixed solution and make coarse granules.

In the oil-water separation method of the present invention, it is preferable to have the following characteristics: the flow velocity of the mixed liquid leading from the lower opening of the nozzle to the lower space is 0.1 m/s to 2.0 m/s.

In addition, in the oil-water separation method of the present invention, preferably, it can be configured to have the following characteristics: the aforementioned second coalescer includes a cylindrical coarse-grained filter, and is arranged laterally in the aforementioned second chamber The axial direction of the aforementioned coarse-grained filter is extended in the horizontal direction; and the flow velocity of the mixed liquid when introducing the mixed liquid into the hollow interior of the aforementioned coarse-grained filter is not less than 0.1 m/s and not more than 1.0 m/s.

In addition, in the oil-water separation method of the present invention, preferably, it can be configured to have the following characteristics: the aforementioned second coalescer includes a circular cylindrical coarse-grained filter, and a hollow filter inserted into the aforementioned coarse-grained filter. The internal liquid distribution pipe is arranged laterally in the second chamber so that the axial direction of the coarse-grained filter extends in the horizontal direction; the aforementioned liquid distribution pipe is spaced along its axial direction and circumferential direction to form a plurality of liquid passages. Holes; the mixed liquid is introduced into the hollow interior of the aforementioned diffuser tube.

In addition, in the oil-water separation method of the present invention, preferably it can be configured to have the following characteristics: the flow rate of the mixed liquid leading out from the aforementioned liquid hole of the aforementioned diffuser pipe to the hollow interior of the aforementioned coarse-grained filter is 0.4 m/ More than 1.0m/s and less than 1.0m/s.

In addition, in the oil-water separation method of the present invention, preferably, it can be configured to have the following characteristics: the aforementioned coarse-grained filter is made of a hydrophobic material. [Effect of the invention]

According to the present invention, it is a two-stage configuration of the first coalescer and the second coalescer, so the height of the device can be reduced. Thereby, the work load when transporting the device can be reduced, and the cost of the device itself can be reduced at the same time.

In addition, even if oil bubbles are generated in the mixed liquid after passing through the first coalescer, the oil bubbles are guided from the upper space of the first chamber to the lower space through the nozzle, so the oil bubbles become smaller, and the small oil bubbles are led out from the nozzle and float up. It accumulates on the top of the lower space, so it can prevent the lower space from being filled with oil bubbles. Thereby, oil bubbles can be suppressed from being supplied to the second coalescer and the like in the subsequent stage together with the mixed solution.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 shows a schematic configuration of an oil-water separator 1 according to an embodiment of the present invention. The oil-water separation device 1 is used, for example, to perform a process of floating and separating oil components from a mixed liquid of water and oil in wastewater such as bilge water in ships.

As shown in Figure 1, the oil-water separation device 1 is equipped with: the airtight container 2 that divides the inner space into the first chamber 20 and the second chamber 21 up and down by the partition plate 26, and the second chamber 20 that is arranged in the first chamber 20. A coalescer 3, the second coalescer 4 arranged in the second chamber 21, and the first chamber 20 is divided into the upper space 20A on the side of the first coalescer 3 and the lower space on the side of the second chamber 21 The nozzle 5 supported by the support plate 25 of 20B.

The airtight container 2 is composed of a cylindrical peripheral wall 22 elongated up and down, a bottom 23 that seals the lower opening of the peripheral wall 22 , and a lid 24 that seals the upper opening of the peripheral wall 22 . The inner space of the airtight container 2 is partitioned into a first chamber 20 in the upper section and a second chamber 21 in the lower section in a manner that the mixed liquid cannot flow through the horizontal horizontal frame partition plate 26 . In addition, the first chamber 20 is divided into an upper space 20A and a lower space 20B so that the mixed liquid can flow through a support plate 25 having a through hole in the center horizontally and horizontally.

On the peripheral wall portion 22 surrounding the upper space 20A of the first chamber 20 of the airtight container 2, a circular cylindrical supply portion 10 for supplying the mixed liquid to the upper space 20A of the first chamber 20 is provided. The supply part 10 is located above the first coalescer 3 . The supply part 10 is connected to the channel and the pump P, and the mixed solution to be processed is continuously supplied from the supply part 10 into the airtight container 2 by the drive of the pump P.

On the peripheral wall portion 22 of the upper space 20A of the first chamber 20 surrounding the airtight container 2, at a position above the supply portion 10, an oil component for discharging from the upper space 20A of the first chamber 20 by floating and separating the mixed liquid is provided. The circular cylindrical discharge part 11. The discharge part 11 has an L-shape with its upper end opening facing the vertically upper side and facing the upper cover part 24 and its lower end opening facing the horizontal direction. The discharge part 11 is connected to the passage and the on-off valve V1, and the oil component is discharged from the discharge part 11 to the outside of the airtight container 2 when the on-off valve V1 is opened.

On the peripheral wall portion 22 of the upper space 20A surrounding the first chamber 20 of the airtight container 2, at a position above the supply portion 10 and at a position different from the discharge portion 11 in the circumferential direction, a device for detecting the liquid level position of the oil component is provided. Oil level detector 8. If the oil level detector 8 detects that an appropriate amount of oil has accumulated, the on-off valve V1 will be opened, otherwise the on-off valve V1 will be closed, and the on-off valve V1 will be automatically controlled.

The first coalescer 3 is horizontally placed on the upper space 20A of the first chamber 20 so as to be located between the supply part 10 and the support plate 25 , and the mixed liquid passes from above to below. The plane view shape of the first coalescer 3 is the same shape and the same size as the cross section of the airtight container 2 .

The first coalescer 3 is a coarse-grained filter including a porous body. Coarse-graining filter has the following functions: when the mixed solution passes through multiple holes, it captures the turbid oil droplets in the mixed solution, and makes the oil droplets combine to form coarse particles to increase the diameter of the oil droplets. Coarse-grained oil droplets are separated from the mixed liquid by floating up after detaching from the first coalescer 3 due to increased buoyancy, and accumulate on the top of the upper space 20A of the first chamber 20 (below the upper cover 24 ).

The coarse particle filter of the first coalescer 3 is used to catch relatively large oil droplets turbid in the mixed liquid and make coarse particles. For the coarse-grain filter of the first coalescer 3, for example, a layered body in which sheet-shaped tungsten or stainless steel metal meshes are laminated multiple times above and below can be used. The mesh size (opening) of the coarse particle filter of the first coalescer 3 is not particularly limited. The coarse-grain filter of the first coalescer 3 is not limited to the above-mentioned laminate of metal mesh, and various conventionally known structures can be used.

The support plate 25 that partitions the first chamber 20 into an upper space 20A and a lower space 20B is horizontally placed on the first chamber 20 so that it is located below the first coalescer 3 . A through hole is formed in the center of the support plate 25 , and the nozzle 5 is installed on the lower surface of the support plate 25 .

The nozzle 5 has a circular cylindrical shape with a predetermined inner diameter and is L-shaped when viewed in longitudinal section, and is supported by the support plate 25 with the upper opening 51 facing vertically upward and the lower opening 50 facing the horizontal direction. The upper opening 51 of the nozzle 5 is located directly below the through hole of the support plate 25 and communicates with the upper space 20A of the first chamber 20 . The lower end opening 50 of the nozzle 5 is located in the lower space 20B of the first chamber 20 and is opposite to the peripheral wall portion 22 of the airtight container 2 . The nozzle 5 introduces the mixed liquid in the upper space 20A from the upper opening 51 to the inside, and guides the mixed liquid from the lower opening 50 to the lower space 20B. In addition, the nozzle 5 may be integrally formed with a straight pipe portion extending in the vertical direction and an L-shaped curved pipe portion, or may be formed by connecting a straight pipe with an L-shaped bent pipe.

The size of the nozzle 5 is appropriately set according to the size of the device and the like. Although it is not particularly limited, for example, if the inner diameter of the airtight container 2 in the lower space 20B of the first chamber 20 is about 300mm to 950mm, and the height is about 150mm to 400mm, the inner diameter of the nozzle 5 can be from 10mm to 55mm. The length of 5 can be more than 50mm and less than 200mm. The nozzle 5 is used to convert the oil bubbles generated from the mixed liquid passing through the first coalescer 3 into small oil bubbles and discharge them into the lower space 20B of the first chamber 20, which will be described in detail later. In order to effectively achieve this purpose, the inner diameter of the nozzle 5 is preferably set within a specified range so that the flow velocity V1 of the mixed liquid introduced from the lower opening 50 of the nozzle 5 described later is within a specified range.

In the surrounding wall portion 22 of the lower space 20B of the first chamber 20 surrounding the airtight container 2, at a position immediately below the support plate 25, an oil component for floating and separating the mixed liquid from the lower space 20B of the first chamber 20 is provided. A circular cylindrical discharge part 12 for discharge. The discharge part 12 is connected to the passage and the on-off valve V2, and the oil component is discharged from the discharge part 12 to the outside of the airtight container 2 when the on-off valve V2 is opened.

In the surrounding wall portion 22 of the lower space 20B surrounding the first chamber 20 of the airtight container 2, at a position immediately above the partition plate 26, a drain for the water and sludge deposited in the first chamber 20 is provided. The circular cylindrical discharge part 13 which discharges from the first chamber 20. The discharge part 13 is connected to the passage and the on-off valve V3, and the discharge liquid is discharged from the discharge part 13 to the outside of the airtight container 2 when the on-off valve V3 is opened.

In the peripheral wall portion 22 of the lower space 20B surrounding the first chamber 20 of the airtight container 2, at a position immediately above the partition plate 26 and at a position different from the discharge portion 13 in the circumferential direction, it is provided for discharging the mixed liquid from the discharge portion 13. The lower space 20B of the first chamber 20 leads to the circular cylindrical outlet portion 14 of the filter 6 . The outlet part 14 is connected to the passage and the on-off valve V4, and the mixed liquid is discharged from the outlet part 14 to the outside of the airtight container 2 when the on-off valve V4 is opened.

The mixed liquid derived from the outlet 14 is supplied to the filter 6, and the solid matter (including suspended matter (SS)) contained in the mixed liquid is separated and removed by the filter 6. The filter 6 includes a housing 60 and a filter 61 detachably installed in the housing 60 . The filter 61 is not particularly limited as long as it is capable of separating and removing solids (including suspended matter (SS)) in the mixed liquid. For example, fiber aggregates such as filter paper, woven fabric, non-woven fabric, and braided fabric can be used. Various conventional components such as sheet filters, bag filters, membrane filters, pleated and other cartridge filters. The fibers constituting the fiber assembly are not particularly limited, and may be natural fibers, synthetic fibers, glass fibers, or a combination thereof.

The housing 60 is provided with a circular cylindrical inflow portion 62 for allowing the mixed liquid before filtration to flow into the housing 60 , and a circular cylindrical outflow portion 63 for allowing the filtered mixed liquid to flow out of the housing 60 . The inflow part 62 is connected to the outlet part 14 via a passage and a valve V4, and the outflow part 63 is connected to an introduction part 15 described later via a passage and a valve V5. The filter 6 separates and removes the solid matter from the mixed liquid, thereby suppressing the clogging of the fine-mesh second coalescer 4 at the rear stage due to the solid matter.

As shown in FIG. 1 and FIGS. 6 to 9 , on the peripheral wall portion 22 of the second chamber 21 surrounding the airtight container 2, a circular cylindrical insertion portion 27 protruding horizontally from the outer peripheral surface is provided. The insertion part 27 is capable of inserting the second coalescer 4 into the second chamber 21 laterally. The front end of the insertion portion 27 forms a flange, and the flange forms a plurality of through holes 28 at equal intervals along the circumferential direction. On the inner surface of the insertion part 27, a pair of fixing parts 29 are provided at intervals, and the guide rails 72 are individually fixed to the pair of fixing parts 29. A pair of guide rails 72 extends parallel to each other in the horizontal direction from the insertion portion 27 toward the second chamber 21 inside, and its terminal is located near the peripheral wall portion 22 on the opposite side to the insertion portion 27 . The guide rail 72 supports the second coalescer 4 from below when the second coalescer 4 is inserted laterally into the second chamber 21 from the insertion portion 27 . Also, at least two guide rails 72 are sufficient, and the number of guide rails 72 may be more than three.

As shown in FIGS. 2 and 5 , the second coalescer 4 includes a coarse-grained filter 40 made of porous material, and reinforcing materials 41 and 42 for reinforcing the inside and outside of the coarse-grained filter 40 . The coarse-graining filter 40 has the following functions: when the mixed liquid passes through a plurality of holes, it catches turbid oil droplets in the mixed liquid, and makes the oil droplets combine with each other to coarsen the oil droplets so as to increase the diameter of the oil droplets. Coarse-grained oil droplets are separated from the mixed liquid by floating up after detaching from the second coalescer 4 due to increased buoyancy, and accumulate on the top of the second chamber 21 (below the partition plate 26 ).

The coarse particle filter 40 catches small oil droplets clouded in the mixed liquid and makes them coarse. The coarse-grained filter 40 can be, for example, a cylindrical body in which a sheet made of fiber aggregates such as woven fabrics, non-woven fabrics, and braided fabrics has a predetermined thickness and is rolled into a cylindrical shape, preferably with pleats in the circumferential direction A cylindrical body formed by overlapping and rolling into a cylindrical shape. The fibers constituting the fiber aggregate are not particularly limited, and may be natural fibers, synthetic fibers, glass fibers, or a combination thereof, preferably hydrophobic fibers such as glass fibers. By forming the coarse-grain filter 40 with hydrophobic fibers, small oil droplets can be effectively captured and coarse-grained. The mesh size (opening) of the coarse filter 40 is not particularly limited, and is, for example, 0.1 μm or more and 10 μm or less. In addition, the coarse-graining filter 40 is not limited to the cylindrical body made of the above-mentioned fiber aggregate, and various conventionally known structures can be used.

The reinforcing material 41 on the outside is in the shape of a circular tube larger than the coarse-grained filter 40 , and the inner surface of the reinforcing material 41 is in contact with the outer surface of the coarse-grained filter 40 . The reinforcing material 42 inside is in the form of a circular tube smaller than the coarse-grained filter 40 , and the outer surface of the reinforcing material 42 is in contact with the inner surface of the coarse-grained filter 40 . The two reinforcing members 40 and 41 are made of metal, for example, and a plurality of through-holes through which the liquid mixture passes are formed at equal intervals over the entire area.

As shown in FIGS. 1 to 9 , the second coalescer 4 is arranged horizontally in the second chamber 21 by using the installation mechanism 7 so that the axial direction of the coarse-grained filter 40 extends in the horizontal direction. The installation mechanism 7 includes a fixed plate 70 installed on the end of one side of the second coalescer 4, installed on the end of the other side of the second coalescer 4 and clamps the second coalescer together with the fixed plate 70. The pressing plate 71 of the knotter 4, and the above-mentioned at least two guide rails 72.

The fixing plate 70 is circular in shape, its diameter is larger than that of the second coalescer 4 and almost the same size as the flange of the insertion part 27 . A plurality of through holes 73 are formed at intervals along the circumferential direction near the outer peripheral edge of the fixing plate 70 . The fixing plate 70 is fixed to the insertion portion 27 by passing unillustrated bolts through the individual through holes 28 and 73 in a state of overlapping the flange of the insertion portion 27 and fastening them with nuts. On the inner surface of the fixing plate 70 , at positions around the second coalescer 4 , there are a plurality of cylindrical parts 75 arranged at intervals in the circumferential direction to form female threads on the inner surface. One end portion of a connecting rod 74 formed with a male thread on the outer surface of both ends is connected to the plurality of cylindrical portions 75 .

The pressing plate 71 is circular, and its diameter is larger than that of the second coalescer 4 and smaller than that of the pressing plate 71 . On the inner surface of the pressing plate 71, at positions around the second coalescer 4 and facing the plurality of cylindrical portions 75 of the fixing plate 70, a plurality of through holes are arranged at intervals in the circumferential direction. The pressing plate 71 is the other end of the connecting rod 74 protruding from the plurality of cylindrical parts 75 of the facing fixed plate 70 under the condition that the second coalescer 4 is sandwiched between the fixed plate 70 and the fixed plate 70. Pass through a plurality of through holes and fasten with nuts 76, thereby pressing the second coalescer 4 on the fixing plate 70. Thereby, the second coalescer 4 is clamped by the fixing plate 70 and the pressing plate 71 .

On the pressing plate 71, a pair of notches 77 are formed on the outer periphery. The notch 77 achieves the following effects by accepting individual corresponding guide rails 72: the pressing plate 71 slides on each guide rail 72, and the rotation of the circumferential direction of the pressing plate 71 (the second coalescer 4) is restricted. The shape of the notch 77 can adopt various shapes as long as the above-mentioned effect can be achieved.

On the outside of the fixing plate 70 and the pressing plate 71 , handles 78 and 79 are respectively provided. By grasping the handles 78 and 79, it is easy to lift the second coalescer 4 when inserting the second coalescer 4 from the insertion part 27 into the second chamber 21 of the airtight container 2, and put the guide rail 72 into the pressing plate Place the pressing plate 71 on the pair of guide rails 72 through the notch 77 of the opening 71, and press the second coalescer 4 while sliding the pressing plate 71 on the pair of guide rails 72, so that the second coalescer 4 Insertion from the insertion portion 27 into the second chamber 21 of the airtight container 2 becomes easy. Furthermore, by fixing the fixing plate 70 to the flange of the insertion part 27 , the second coalescer 4 can be arranged laterally in the second chamber 21 .

A through hole 700 is formed in the center of the fixing plate 70, and a circular cylindrical introduction portion 15 communicating with the through hole 700 is provided. The introduction part 15 is connected to the outflow part 63 of the filter 6 through the passage and the on-off valve V5, and the mixed liquid from which the solids are removed in the filter 6 is supplied to the second coalescer 4 from the introduction part 15 by opening the on-off valve V5 The coarser filter 40 has a hollow interior 43 . Then, the mixed liquid is transmitted to the coarse-grained filter 40 from the plurality of through-holes of the reinforcing material 41 on the inner side, passes through the coarse-grained filter 40 from the inner surface toward the outside, and is supplied to the second through-hole from the plurality of through-holes of the reinforcing material 40 on the outer side. Room 21. The above-mentioned lead-out part 14, lead-in part 15 and the passage connecting them constitute a circulation passage for inducing the mixed liquid from the lower space 20B of the first chamber 20 of the airtight container 2 to the filter 6 and then supplying it to the second chamber 21.

As shown in Figure 1, surround the peripheral wall portion 22 of the second chamber 21 of the airtight container 2, at the position above the second coalescer 4 and immediately below the partition plate 26, it is set for mixing The oil components separated by floating on the liquid are discharged from the second chamber 21 through the cylindrical discharge part 16 . The discharge part 16 is connected to the passage and the on-off valve V6, and the oil component is discharged from the discharge part 16 to the outside of the airtight container 2 when the on-off valve V6 is opened.

In the peripheral wall portion 22 of the second chamber 21 surrounding the airtight container 2, at the position immediately above the bottom 23, it is provided to discharge the treated mixed liquid for separating the oil component and reducing the concentration of the oil component from the second chamber 21. The circular cylindrical discharge part 17. The discharge part 17 is connected to the passage and the on-off valve V7, and the treated mixed liquid is discharged from the discharge part 16 to the outside of the airtight container 2 when the on-off valve V7 is opened.

In the peripheral wall portion 22 of the second chamber 21 surrounding the airtight container 2, at a position immediately above the bottom 23 and at a position different from the discharge portion 17 in the circumferential direction, it is provided for removing the moisture deposited in the second chamber 21. And the discharge part 18 of the circular cylindrical shape which discharges the discharge liquid of sludge etc. from the 2nd chamber 21. The discharge part 18 is connected to the passage and the on-off valve V8, and the discharge liquid is discharged from the discharge part 18 to the outside of the airtight container 2 when the on-off valve V8 is opened.

Next, the oil-water separation treatment method of the mixed liquid in the oil-water separation device 1 of the present embodiment configured as above will be described with reference to FIG. 10 . First, the mixed liquid is supplied to the upper space 20A of the first chamber 20 in the airtight container 2, and initially the floating oil is separated due to the difference in specific gravity and accumulated on the top of the upper space 20A. The mixed liquid from which the floating oil has been removed passes through the first coalescer 3. At this time, the large oil droplets turbid in the mixed liquid are captured by the first coalescer 3, and the captured oil droplets are combined and coarse-grained. Thereby, the coarse-grained oil droplets are separated from the first coalescer 3 and float up due to the increase in buoyancy, thereby being separated from the mixed liquid and accumulated on the top of the upper space 20A. The oil component accumulated on the ceiling of the upper space 20A is discharged from the discharge part 11 to the outside of the airtight container 2 by opening the on-off valve V1.

After passing through the first coalescer 3 , the liquid mixture is supplied to the lower space 20B through the nozzle 5 supported by the support plate 25 that separates the upper space 20A and the lower space 20B of the first chamber 20 . At this time, the mixed liquid after passing through the first coalescer 3 generates oil bubbles, and the space below the first coalescer 3 is filled with oil bubbles. However, when the oil bubbles and the mixture pass through the L-shaped nozzle 5 with a small caliber, the oil bubbles become smaller, and the small oil bubbles are led out from the nozzle 5 and then float up, so that the oil bubbles accumulate on the top of the lower space 20B (below the support plate 25), and form a layer of accumulated moisture in the lower part of the lower space 20B. The oil bubbles accumulated on the ceiling of the lower space 20B are discharged from the discharge part 12 to the outside of the airtight container 2 when the on-off valve V2 is opened. Thereby, oil bubbles can be suppressed from being supplied to the filter 6 and the second coalescer 4 via the outlet portion 14 .

The nozzle 5 is provided for the purpose of converting the large oil bubbles generated by the mixed liquid passing through the first coalescer 3 into small oil bubbles and making it easy to discharge from the discharge part 12 to the outside of the airtight container 2. discharge. Here, the flow velocity V1 of the mixed liquid exported from the opening 50 at the lower end of the nozzle 5 to the lower space 20B of the first chamber 20 can effectively reduce the oil bubbles led out from the nozzle 5 and reduce the pressure loss when the mixed liquid passes through the nozzle 5, From the viewpoint of preventing the flow of the mixed liquid in the lower space 20B of the first chamber 20 caused by the mixed liquid introduced from the nozzle 5 from becoming violent and efficiently separating oil from water, etc., it is preferably 0.1 m/s or more and 2.0 m /s or less, preferably 0.1 m/s or more and 1.0 m/s or less.

The flow velocity V1 can be calculated from the volume of the mixed liquid flowing through the nozzle 5 per unit time and the cross-sectional area of the nozzle 5. The flow velocity V1 can be adjusted within the above range by controlling the inner diameter of the nozzle 5 or the flow rate of the mixed liquid. In addition, the flow velocity V1 is not limited to the above range.

The mixed liquid supplied to the lower space 20B after passing through the first coalescer 3 is supplied to the filter 6 from the airtight container 2 through the outlet 14, and the solid matter contained in the mixed liquid is separated and removed in the filter 6 (also including suspended matter (SS)), it is supplied to the second coalescer 4 through the introduction part 15 . Thereby, the mesh of the filter of the densest second coalescer 4 can be prevented from being clogged by the solid matter contained in the mixed liquid.

The mixed liquid supplied to the second coalescer 4 passes through the second coalescer 4, and at this time, the small oil droplets in the mixed liquid not captured in the first coalescer 3 are captured by the second coalescer 4 , the captured oil droplets are combined and coarse-grained. In this way, the coarse-grained oil droplets are separated from the second coalescer 4 and float up due to the increase in buoyancy, thereby being separated from the mixed liquid and accumulated on the top of the second chamber 21 . The oil component accumulated on the top of the second chamber 21 is discharged from the discharge part 16 to the outside of the airtight container 2 by opening the on-off valve V6.

When the mixed liquid is supplied from the introduction part 15 to the second coalescer 4, the mixed liquid is supplied to the hollow interior 43 of the coarse-grained filter 40, and then the mixed liquid passes through the reinforcing material 41 inside, the coarse-grained filter 40, and the outer The reinforcing material 40 (from inside to outside). At this time, if the flow of the mixed liquid in the hollow interior 43 of the coarse-grained filter 40 is fast, the mixed liquid collides and flows at the end (pressing plate 71) of the coarse-grained filter 40, and the flux around the end is relatively large. The other part is large and there is a possibility that oil leakage may occur. Therefore, from the viewpoint of suppressing the leakage of the above-mentioned oil components, the flow velocity V2 of the mixed liquid introduced from the introduction part 14 (circulation passage) into the hollow interior of the coarse filter 40 is preferably 0.1 m/s or more and 1.0 m /s or less, preferably 0.3 m/s or more and 0.7 m/s or less.

The flow velocity V2 can be calculated from the volume of the mixed solution per unit time flowing through the introduction part 14 and the cross-sectional area of the introduction part 14. The flow velocity V2 can be adjusted to the above-mentioned value by controlling the inner diameter of the introduction part 14 or the flow rate of the mixed solution. range. In addition, the flow velocity V2 is not limited to the above range.

According to the oil-water separation device 1 of the present embodiment having the above-mentioned configuration, since the first coalescer 3 and the second coalescer 4 are constructed in two stages, the height of the device can be reduced. Thereby, the work load when transporting the device can be reduced, and the cost of the device itself can be reduced at the same time.

In addition, even if the mixed liquid after passing through the first coalescer 3 generates oil bubbles, the oil bubbles are guided from the upper space 20A of the first chamber 20 to the lower space 20B through the nozzle 5, so that the oil bubbles become smaller, and the small oil bubbles flow from the first chamber 20 to the lower space 20B. After the nozzle 5 is led out, it floats up and accumulates on the top of the lower space 20B, so that the lower space 20B is prevented from being filled with oil bubbles. Therefore, oil bubbles and mixed liquid can be suppressed from being supplied to the filter 6 and the second coalescer 4 from the outlet 14, so that the filtration process of the filter 6 is not hindered, and the coarsening of the second coalescer 4 can be further prevented. The filter 40 is clogged with oil bubbles.

In addition, according to the oil-water separator 1 of the present embodiment, the flow velocity V1 of the mixed liquid introduced from the opening 50 at the lower end of the nozzle 5 to the lower space 20B of the first chamber 20 is not less than 0.1 m/s and not more than 2.0 m/s, Thereby, the following effects are achieved: the oil bubbles derived from the nozzle 5 can be effectively reduced, the pressure loss of the mixed liquid passing through the nozzle 5 can be reduced, and the pressure loss of the lower space 20B of the first chamber 20 caused by the mixed liquid derived from the nozzle 5 can be reduced. The flow of the mixed liquid becomes stable so that oil and water can be separated efficiently.

In addition, according to the oil-water separation device 1 of this embodiment, the flow velocity V2 of the mixed liquid in the hollow interior 43 of the coarse-grained filter 40 introduced from the introduction part 15 (circulation passage) to the second coalescer 4 is 0.1 m /s to 1.0 m/s, so as to achieve the effect of suppressing the leakage of oil components at the end of the coarse-graining filter 40 (pressing plate 71).

In addition, according to the oil-water separation device 1 of the present embodiment, the second coalescer 4 is arranged laterally in the second chamber 21 so that the axial direction of the coarse-grained filter 40 extends in the horizontal direction. After the device 4 is pushed into the second chamber 21 from the insertion part 27 through the pressing plate 71 while sliding on the guide rail 72 of the installation mechanism 7, the fixing plate 70 is fixed to the insertion part 27, so that the second coalescer 4 is arranged on the second chamber 21. Room 21. Therefore, the workability of the installation work of the second coalescer 4 is improved, and the work load can be reduced.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the concept of the present invention.

As a modified example, as shown in FIG. 11 , for example, the second coalescer 4 may also insert a diffuser pipe 44 into the hollow interior 43 of the coarse particle filter 40 . The diffuser tube 44 has one end open and the other end closed, and the end on the closed side is positioned near the pressing plate 71 and inserted into the coarse grain filter 40 . The end of the opening side of the liquid distribution tube 44 is fixed to the fixing plate 70 , and the opening of one end of the liquid distribution tube 44 is adjacent to the through hole 700 of the fixing plate 70 and communicates with the introduction portion 15 . Thereby, the mixed liquid from which the solid matter is removed by the filter 6 is introduced from the introduction part 15 (circulation passage) into the hollow interior 45 of the liquid diffuser pipe 44 .

The liquid-spreading pipe 44 is formed with a plurality of liquid-through holes 46 at intervals along its axial direction and circumferential direction. The diameter of the liquid passage hole 46, the interval between the two liquid passage holes 46 adjacent to the axial direction of the liquid distribution pipe 44, and the interval between the two liquid passage holes 46 adjacent to the circumferential direction of the liquid distribution pipe 44 are not particularly special. It is limited, but it is preferably set so that the flow velocity V3 described later is within a prescribed range.

In the modified example shown in FIG. 11 , the liquid mixture from which the solid matter has been removed by the filter 6 is supplied from the introduction part 15 to the hollow interior 45 of the diffuser pipe 44 of the second coalescer 4 . Then, the mixed liquid is supplied to the hollow interior 43 of the coarse-grained filter 40 through the plurality of liquid-through holes 46 of the liquid-dispersing pipe 44, and is transmitted to the coarse-grained filter 40 from the plurality of through-holes of the reinforcing material 41 inside. The inner surface passes through the coarse grain filter 40 toward the outside, and then is supplied to the second chamber 21 from a plurality of through holes of the reinforcement material 40 on the outside. Thereby, when the mixed liquid is supplied from the introduction part 15 to the second coalescer 4, even if the flow of the mixed liquid is fast, the mixed liquid will not violently collide with the end (holding plate 71) of the coarse-graining filter 40. The axial direction of the granulation filter 40 distributes the mixed solution equally, so that leakage of the oil component around the end can be prevented.

Here, the flow velocity V3 of the mixed solution led out from the liquid passage hole 46 of the diffuser pipe 44 to the hollow interior 43 of the coarse-grained filter 40 is from the viewpoint of evenly distributing the mixed solution in the axial direction of the coarse-grained filter 40 , preferably not less than 0.4 m/s and not more than 1.0 m/s.

The flow velocity V3 can be calculated from the volume of the mixed liquid per unit time flowing through the liquid diffuser pipe 44 and the total cross-sectional area of the liquid through hole 46, and can be controlled by controlling the diameter or quantity of the liquid through hole 46, the flow rate of the mixed liquid, etc. The flow rate V2 is adjusted within the above range. In addition, the flow velocity V3 is not limited to the above range.

As another modification, although the drawing is omitted, multiple nozzles 5 may be supported on the support plate 25, and the mixed liquid may be led out from the upper space 20A of the first chamber 20 to the lower space 20B through the multiple nozzles 5.

As another modification, although the drawing is omitted, the second coalescer 4 may be arranged vertically in the second chamber 21 so that the axial direction of the coarse particle filter 40 extends in the vertical direction.

As another modified example, although the drawing is omitted, a plurality of second coalescers 4 may be installed in the second chamber 21 .

1: Oil-water separation device 2: airtight container 10: Supply Department 11: discharge part 12: discharge part 13: discharge part 14: Export Department 15: Import Department 16: discharge part 17: discharge part 18: discharge part 20: Room 1 20A: The upper space of the first room 20B: The lower space of the second room 21: Second Room 22: Peripheral wall 23: Bottom 24: upper cover 25: support plate 26: Partition board 27: Insertion part 29: fixed part 3: The first coalescer 4: The second coalescer 40: Coarse grain filter 43: Hollow interior of the coarse-grained filter 44: The hollow interior of the diffuser pipe 45: Dispersion tube 46: liquid hole 5: Nozzle 50: Opening at the lower end of the nozzle 51: Opening on the upper end of the nozzle 6: filter 60: shell 61: filter 62: Inflow part 63: outflow part 7: Installation mechanism 70: Fixed plate 71: press board 72: guide rail 77: Gap 8: Oil level detector P: pump V1~V8: switch valve

[FIG. 1] shows the schematic structure of the oil-water separator of this embodiment. [Figure 2] shows the appearance and internal structure of the second coalescer. [Figure 3] is the fixed plate showing the front view. [Picture 4] shows the pressing board from the front view. [Figure 5] shows the internal structure of the second coalescer. [Figure 6] shows the insertion part of the airtight container from the front view. [Fig. 7] shows the vicinity of the insertion part of the airtight container from the top view. [Figure 8] shows the state where the second coalescer is installed in the second chamber of the airtight container. [Fig. 9] shows the state where the second coalescer is installed in the second chamber of the airtight container. [ Fig. 10 ] shows the state of treating the mixed liquid by the oil-water separation device of this embodiment. [Fig. 11] shows the internal structure of the second coalescer of the modified example. [Fig. 12] shows the schematic structure of the oil-water separator of the previous example. [ Fig. 13 ] shows a schematic configuration of a modified example of the oil-water separator of the previous example.

1: Oil-water separation device

2: airtight container

10: Supply Department

11: discharge part

12: discharge part

13: discharge part

14: Export Department

15: Import Department

16: discharge part

17: discharge part

18: discharge part

20: Room 1

20A: The upper space of the first room

20B: The lower space of the second room

21: Second Room

22: Peripheral wall

23: Bottom

24: upper cover

25: support plate

26: Partition board

27: Insertion part

29: fixed part

3: The first coalescer

4: The second coalescer

5: Nozzle

50: Opening at the lower end of the nozzle

51: Opening on the upper end of the nozzle

6: filter

60: shell

61: filter

62: Inflow part

63: outflow part

7: Installation mechanism

70: Fixed plate

71: press board

72: guide rail

8: Oil level detector

P: pump

V1~V8: switch valve

Claims (9)

An oil-water separation device, which is an oil-water separation device for floating and separating oil components of a mixed liquid of water and oil, is characterized in that it has: Airtight container, the internal space is divided into a first chamber and a second chamber, and the mixed liquid is supplied to the first chamber; The first coalescer is set in the first chamber to allow the mixed liquid to pass through, and to capture and coarsely granulate the oil droplets in the mixed liquid; The second coalescer is arranged in the second chamber to pass the mixed liquid after passing through the first coalescer, and capture oil droplets in the mixed liquid and coarsely granulate them; and The nozzle is supported by a support plate that divides the first chamber into an upper space on the side of the first coalescer and a lower space on the side of the second chamber, and the upper end is opened for introducing the mixed liquid from the upper space, and the lower end is opened In order to lead the mixed solution to the lower space, the lower opening is L-shaped towards the horizontal direction. The oil-water separation device according to claim 1, wherein the flow velocity of the mixed liquid leading out from the lower opening of the nozzle to the lower space is 0.1 m/s to 2.0 m/s. The oil-water separation device as described in claim 1 or 2, wherein a filter is further provided to remove solids in the mixed liquid supplied in the lower space; The second coalescer includes a circular cylindrical coarse-grained filter, and is arranged laterally in the second chamber so that the axial direction of the coarse-grained filter extends in the horizontal direction, and is configured to The hollow inside of the filter introduces the mixed liquid after passing through the filter. The oil-water separation device according to claim 3, wherein the flow velocity of the mixed liquid introduced into the hollow interior of the coarse-grained filter is not less than 0.1 m/s and not more than 1.0 m/s. The oil-water separation device as described in claim 3 or 4, wherein the second coalescer further includes a liquid diffuser inserted into the hollow interior of the coarse-grained filter, and is configured to be located between the diffuser The hollow interior introduces the mixed liquid after passing through the filter; The liquid-dispersing pipe is formed with a plurality of liquid-through holes at intervals along its axial direction and circumferential direction. The oil-water separation device according to Claim 5, wherein the flow velocity of the mixed liquid leading out from the liquid hole of the liquid dispersion pipe to the hollow interior of the coarse-grained filter is not less than 0.4 m/s and not more than 1.0 m/s. The oil-water separation device according to any one of claims 3-6, wherein the coarse-grained filter is made of hydrophobic material. The oil-water separation device according to any one of claims 3 to 7, wherein, in the airtight container, an insertion portion that can insert the second coalescer laterally into the second chamber is provided; The second coalescer is arranged horizontally in the second chamber with the axial direction of the coarse-grained filter extending in the horizontal direction through the installation mechanism; The installation mechanism includes at least two parallel guide rails extending inward from the insertion part in the horizontal direction, and a pressing plate installed on the end of the second coalescer inserted into the insertion part first; At least two notches are formed on the pressing plate, and the notch is used to allow the pressing plate to slide on the at least two parallel guide rails by receiving the corresponding guide rails, and limit the rotation of the second coalescer in the circumferential direction. An oil-water separation method, which is an oil-water separation method for floating a mixed liquid of water and oil to separate oil components, and its characteristics include: In the supplying step, the inner space of the airtight container is divided into upper and lower first chambers and second chambers, and the first chamber is divided into an upper space and a lower space by a support plate, and the mixed liquid is supplied to the upper space of the airtight container ; The first coarse granulation step is to make the mixed liquid pass through the first coalescer installed in the upper space and capture the oil droplets in the mixed liquid and make coarse granules; The exporting step is to introduce the mixed liquid passing through the upper space of the first coalescer from the upper opening of the L-shaped nozzle supported by the supporting plate and export it from the lower opening in the lower space toward the horizontal direction to the lower space; and The second coarse-graining step is to make the mixed liquid in the lower space pass through the second coalescer installed in the second chamber to capture oil droplets in the mixed liquid and coarse-grain it.

Images