JPH08252404A - Oil and water separating apparatus - Google Patents

Abstract

PURPOSE: To improve oil and water separating function with porous separation plates by differing the positrons of holes of first separation plates and second separation plates 2 in the up and down direction and making a liquid which passes the differing holes come into collision against the walls of separating plates set below. CONSTITUTION: While passing respective holes 23a, 23b of separation plates 21a, 21b laid in a multilayered state, a cleaning liquid which flows into an oil-water separating tank 10 flows down in the tank. Since those holes 23a, 23b are made to differ for every separation plate 21a, 21b, immediate after the cleaning liquid passes the holes 23a or holes 23b, the cleaning liquid surely comes into collision against the walls of the next separation plates 21b or 21a and coarsening function is effectively carried out and fine particles are converted into coarse particles. Further, during the process in which the coarse particles C flows slowly to the holes of the next separation plate at a proper flow rate on a hole-free tilting path E, oil-water separation of the coarse particles C can be carried out effectively based on the gravity difference. Consequently, oil particles C which float and are separated in the path E gather in the center part along the tilting faces in the rear sides of respective separation plates 21a, 21b and are collected in an oil collecting chamber 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / water separator for coarsening fine particles of a liquid containing fine particles and floating and separating them by the difference in specific gravity.

[0002]

2. Description of the Related Art A conventional separator having a conical perforated plate is provided with holes on the entire surface, and a plurality of separators having the same size and shape are stacked with a gap. Therefore, the holes of the separating plates vertically adjacent to each other are partially located at the same position, and the effect of the liquid flow short-passing the separating plates and stacking the separating plates is reduced, and the oil-water separation performance is reduced. It had a bad effect.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oil / water separator having improved oil / water separation performance by means of a porous separator.

[0004]

According to the present invention, in an oil-water separation device in which the fine particles of a liquid containing fine particles are coarsened and float-separated by the difference in specific gravity thereof, the oil-water separation apparatus is formed into a conical shape having a perforation and has a central portion A plurality of first and second separation plates having holes are stacked inside the oil-water separation tank by alternately providing gaps, and the first separation plate and the second separation plate are arranged in the vertical direction of the holes. The liquid which has deviated from the position and has passed through the hole collides with the wall of the lower separating plate.

Further in accordance with the present invention, the first and second
The liquid that has passed through the holes of the first separating plate collides with the wall of the next separating plate and changes its flow, and then a passage that flows to the next hole is formed by being sandwiched between the walls without holes of the first and second separating plates. According to the present invention, the cross-sectional shape of the passage is a slanting plate shape so as to have a floating separation action. A plurality of first and second separation plates that are porous and formed in a conical shape and that have a central hole are alternately stacked inside the oil-water separation tank with a gap between them, and each of the first separation plates is A hole is provided in the outer peripheral portion, and each hole of the second separating plate is provided in the inner peripheral portion, and the oil particles coarsened by the showering action are floated and separated between the respective holes of both separating plates due to the difference in specific gravity. It forms a flowing non-perforated inclined passage.

Further, according to the present invention, downward burring processing is applied to each hole of the first and second separation plates. According to the present invention, the first and second holes having different positions are provided. There are multiple types of separation plates.

[0007]

In the oil-water separation device configured as described above, the liquid surely collides with the wall of the lower separation plate every time the liquid flows down through the burned hole, and the oil fine particles are separated by the showering action. Grains are made one after another. And
While flowing through the non-perforated inclined passage, the coarse oil particles are floated and separated, and along the upper surface of the inclined passage, around the edge of the burring hole, pass through the central hole, float, and are discharged to the outside. .

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, in the illustrated example, the outlet 2 of the cleaning tank 1 is a circulation pump 3 and a flow meter 4 by a delivery circuit L1.
Also, it is connected via a filter 5 to an inflow port 12 of the oil / water separation tank, which is generally designated by 10. The oil-water separation tank 10
The treated water outlet 13 is connected to the upper part of the cleaning tank 1 by the return circuit L2, and the oil extraction port 15 at the top is connected to the oil water separation tank 10
It is connected to the oil extraction receiver 8 via the oil extraction circuit L3 by the internal pressure of. A pressure gauge 6 is provided in the delivery circuit L1.

2 to 4, the oil-water separation tank 10 is shown.
An inflow port 12 is provided on the upper part of the cylindrical main body 11 of
A treated water outlet 13 is provided at the bottom, and an oil extraction port 15 is provided at the top via an oil reservoir chamber 14.

Inside the main body 11, between the lower treated water storage chamber 16 and the top oil storage chamber 14, there is housed a separation plate stack indicated by reference numeral 20 as a whole. The separator stack 20 is formed by stacking a plurality (five in the illustrated example) of first separators 21a and second separators 21b with a gap D alternately.

The first separating plate 21a is formed in a conical shape having a central hole 22 in the center and expanding downward, and a plurality of rows (two rows in the illustrated example) are formed in the outer peripheral portion. Hole 2
3a is formed. The hole 23a is provided with a downward protruding edge portion 24 which is a burring portion curved downward from the separating plate 21a by burring.

On the other hand, the second separating plate 21b is configured substantially the same as the first separating plate 21a, and the inner peripheral portion is provided with the projecting edge portions 24 in a plurality of rows (three rows in the illustrated example). Many holes 2
3b is formed. Therefore, the separator stack 20
A central passage L is formed at the center of each of the central holes 22 and a hole 23a is formed between the separating plates 21a and 21b.
In a range W where there is no hole 23a, 23b between
An inclined passage E is formed. The inclination angle θ of the inclined passage E is set to, for example, 10 ° to 20 °.

Next, the operation will be described.

The cleaning liquid (mixed liquid of water, detergent and fine oil particles) A in the cleaning tank 1 is sent from the delivery circuit L1 to the inlet 12 of the oil / water separation tank 10 by the circulation pump 3. At this time, the flow meter 4, the pressure gauge, and the filter 5 control the pressure and flow rate of the cleaning liquid A flowing into the oil / water separation tank 10 to remove sludge. Therefore, the oil-water separation tank 10
The cleaning liquid A that has flowed into the separation plate 2 is stacked in multiple layers.
It flows down while passing through the respective holes 23a and 23b of 1a and 21b. The holes 23a and 23b are, as shown in FIG.
Since the separation plates 21a and 21b are alternately displaced,
Immediately after the cleaning liquid A passes through the hole 23a or the hole 23b, it collides with the wall of the next separating plate 21b or 21a without fail, and the showering effect is effectively performed to coarsen the fine coarse particles.

Further, the coarse oil particles C flow through the non-perforated inclined passage E between the separation plates 21a and 21b slowly at an appropriate flow rate to the holes of the next separation plate, and the difference in specific gravity between them. This effectively separates oil and water.

As a result, the oil particles C floated and separated in the passage E gather in the central portion along the inclined surfaces on the back surfaces of the separation plates 21a and 21b, and then in the oil reservoir 14 via the central passage L.
At this time, the oil particles C move around the projecting edge portions 24 of the holes 23a and 23b, so that they are prevented from recombining with the cleaning liquid A passing through the holes 23a and 23b.

Then, the oil particles C which have been made into elementary particles and collected in the oil reservoir 14 are extracted by the internal pressure into the oil extraction receiver via the oil extraction circuit L3, and the treated water B from which the coarse particles are separated is treated. It is returned from the water outlet 13 to the cleaning tank 1 via the return circuit L2.

In the above operation, the separation plates 21a, 21b
By increasing / decreasing the number of sheets, it is possible to freely change the so-called collapsing area, that is, the area of the separating plate and the total length of the inclined passages E, and improve the oil / water separation efficiency.

[0020]

Since the present invention is configured as described above, it has the following effects. (1) In the conventional separation plate method, since holes are provided on the entire surface of the separation plate, there is a part where the holes of the separation plates that are vertically adjacent to each other inevitably overlap. There was no collision of the cleaning liquid on the wall of the separation plate, and the tending effect tended to decrease.
In the present invention, it surely causes the showering action,
Fine oil particles can be made into elementary particles. (2) By displacing the positions of the holes of each separation plate, it is possible to form an inclined passage and promote floating separation of the coarsened oil particles. (3) Therefore, the oil-water separation performance can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing the oil-water separation tank of FIG.

FIG. 3 is a top view of a first separation plate.

FIG. 4 is a top view of a second separation plate.

FIG. 5 is a side sectional view of first and second separation plates.

[Explanation of symbols]

 A ... Cleaning liquid B ... Treated water C ... Coarse-grained oil particles D ... Gap E ... Inclined passage L ... Central passage L1 ... Delivery circuit L2 ... Return circuit L3 ... Oil extraction circuit W ... Range 1 ... Washing tank 2 ... Outlet 3 ... Circulation pump 4 ... Flowmeter 5 ... Filter 6 ... Pressure gauge 8 ...・ Extracted oil receiver 10 ・ ・ ・ Oil water separation tank 11 ・ ・ ・ Main body 12 ・ ・ ・ Inflow port 13 ・ ・ ・ Processed water outlet 14 ・ ・ ・ Oil storage chamber 15 ・ ・ ・ Oil extraction port 16 ・ ・ ・ Processed water storage chamber 20 ... Separating plate stack 21 ... Separating plate 21a ... First separating plate 21b ... Second separating plate 22 ... Central hole 23, 23a, 23b ... Hole 24 ...・ Bridge

Claims (5)

[Claims] 1. An oil-water separation device in which fine particles of a liquid containing fine particles are coarsened and float-separated by a difference in specific gravity thereof, and a plurality of first and first cone-shaped and central holes are provided. The two separation plates are alternately stacked inside the oil-water separation tank with a gap between them to form a first separation plate and a second separation plate.
The oil / water separation device is characterized in that the vertical position of the hole with respect to the separation plate is deviated, and the liquid passing through the hole collides with the wall of the lower separation plate. 2. A passage through which the liquid that has passed through the holes of the first and second separation plates collides with the wall of the next separation plate to change its flow and then flows into the next hole has the first and second separation plates. The oil-water separation device according to claim 1, wherein the oil-water separation device is formed by being sandwiched by walls having no holes in the plate, and the cross-sectional shape of the passage is an inclined plate shape so as to perform a floating separation action. 3. An oil-water separation device in which the fine particles of a liquid containing fine particles are coarsened and float-separated by the difference in specific gravity thereof, and a plurality of first and first conical holes each having a central hole are formed. The two separation plates are stacked alternately inside the oil-water separation tank with a gap therebetween, each hole of the first separation plate is provided in the outer peripheral portion, and each hole of the second separation plate is provided in the inner peripheral portion. An oil-water separation device is characterized in that a non-perforated inclined passage is formed between the holes of both separating plates, in which oil particles coarsened by a coalescing action flow while floating and separating due to a difference in specific gravity. 4. The oil-water separator according to claim 1, wherein each hole of the first and second separation plates is subjected to downward burring processing. 5. The oil-water separator according to claim 1, wherein a plurality of types of first and second separation plates having different positions of holes are prepared.