JPH0817885B2 - Oil water separator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for efficiently separating oil and water in industrial exhaust such as oil-water mixed liquid discharged from the drain of a compressed air dehumidifier. Generally, the specific gravity of water is 1, while kerosene
0.78 ~ 0.82, heavy oil 0.82 ~ 0.96, light oil 0.815 ~ 0.855,
Gasoline 0.74 to 0.76 and lubricating oil are light as 0.75 to 0.85, and since they are difficult to mix, separation is performed using the difference in specific gravity.

[0002]

2. Description of the Related Art As a conventionally known oil / water separation device of this type, the inside of the container is divided into a water storage chamber and an oil storage chamber through a partition plate.
The chamber is divided into two chambers, and the two chambers are communicated with each other through a passage provided in the lower part of the partition plate, and the vicinity of the bottom of the oil storage chamber and the drain trap of the compressed air dehumidifier are connected via a pipe. It is known that the connection is made and a floating oil discharge pipe is attached to the upper part of the oil storage chamber, and an overflow pipe having one end opened toward the ceiling is installed in the water storage chamber (Japanese Patent Laid-Open No. 61- No. 1882). In such a device, the oil-water mixed water discharged from the drain trap is guided to the oil storage chamber through a pipe, and due to the difference in specific gravity, the oil floats to form a layer, and the water separates to form a layer below it. . Then, the separated water is configured to flow into the water storage chamber through a passage provided in the lower portion of the partition plate and to be discharged through an overflow pipe provided in the water storage chamber.

[0003]

However, in such a conventional oil separation device, since the raw water containing oil flows from the bottom of the oil storage chamber and cannot be completely separated, the water from the opening at the bottom of the partition plate enters the water storage chamber. There is a risk of getting in, and the separation is not sufficient. Further, since the floating oil is not automatically discharged, there is a disadvantage that the floating oil accumulates too much. Further, it is necessary to always observe the oil accumulation state in order to eliminate the excessive accumulation, but there is a disadvantage that it is very difficult to judge with ordinary aggression because the portion is dirty. Therefore, the present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides an apparatus that is superior in separation as compared with the conventional apparatus and that can automatically remove floating oil without judging the oil accumulation state. The purpose is to do.

[0004]

That is, according to the present invention, a hollow columnar primary treatment container having a water inlet at the center of the ceiling and a secondary secondary treatment container which is continuously provided below the side surface of the primary treatment container to form the outer shape of the container into an L shape. A closed container consisting of a processing container, and a water overflow pipe having an inlet near the bottom of the secondary processing container of the closed container and protruding to the outside with a height difference up to a predetermined height h in the closed container. And an oil overflow pipe having one end opening upward and a second end projecting outside the container at a predetermined lifting height H in the primary processing container, and facing the container ceiling water injection port. And a bottomed cylindrical container attached to the ceiling wall surface,
The cylindrical container is attached to the bottom of the cylindrical container and has an inclined surface at the upper portion, and water is poured onto the lower side surface of the bottomed cylindrical container.
A hole for discharging the mixed water into a closed container is provided, the primary treatment container and the secondary treatment container are partitioned via a partition plate, and communication holes are opened in the upper and lower portions of the partition plate. This object is achieved by an oil-water separator.

[0005]

In the device according to the present invention, the oil-mixed water is poured from the water injection port provided at the center of the ceiling of the casing, and the water flows along the surface of the columnar object without scattering through the inclined surface of the columnar object. It drips down and collects in a cylindrical container. The accumulated mixed water is discharged into the primary treatment container through a hole provided on the lower side surface of the container, and is separated into water and oil by the difference in specific gravity there. The mixed water continues to be collected while being separated, and the water flows into the secondary treatment container through the communication hole provided in the lower part of the partition plate and accumulates. The oil that has entered the secondary processing container returns to the primary processing container through the upper communication hole of the partition plate. When the secondary treatment container becomes full and the pressure due to the thickness of the water and oil layers becomes higher than the pressure of water coming from the height h of the water overflow pipe, the separated water is discharged from the bottom of the container. . On the other hand, the separated oil layer gradually thickens, and when it reaches a certain height H, it is automatically discharged through the oil overflow pipe, so that the oil layer has a constant thickness. Also, from the relationship that the pillar-shaped object is installed in the cylindrical container, when the water level is higher than the bottom of the columnar object, the rate of rise of the water level increases because the substantial cross-sectional area of the primary treatment container is narrowed. A slight increase in water causes water and oil to be separated and discharged through the overflow pipe.

[0006]

The present invention will be described in detail below with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 denotes a closed container composed of a hollow columnar primary processing container 1a made of a material such as a synthetic resin and a secondary processing container 1b which communicates with the primary processing container 1a at the lower side of the side surface and forms the entire container into an L shape. The primary treatment container 1a of the container 1 is provided with a water injection port 2 for industrial wastewater at the center of the ceiling, and the primary treatment container 1a has a ceiling wall with its opening facing the water injection port 2. The bottom cylindrical container 3 is joined, and in the present embodiment, a columnar object 4 having an inclined surface (conical shape in the embodiment) is installed on the top through a pedestal 3a provided at the bottom of the container 3. A hole 6 is provided below the side wall 5 of the container 3 for discharging the mixed water injected from the water injection chamber 2 into the primary treatment container, and above the side wall 5 there is a hole 6 inside the container 3. Primary processing vessel 1a to reduce pressure
An air passage hole 7 is provided for communicating with the inside. The primary treatment container 10a and the secondary treatment container 10b are partitioned by a partition plate 22, and a communication hole for communicating water in the lower part.
24, a communication hole 26 is formed in the upper part for returning the oil to the primary processing container 10a. Needless to say, the shape of the upper inclined surface of the columnar object 4 may be a tapered shape or a spherical shape (including an elliptic shape).

Further, the secondary processing container 1b of the closed container 1 has a suction port in the vicinity of the bottom, extends upward through the primary processing container 1a, and is projected outside at the lifting height h of the closed container 1. In the middle position between the water overflow pipe 8 and the side wall of the primary treatment container 1b, one end projects outside and the other end (oil inlet)
Is arranged at a predetermined height H (H> h) from the bottom of the container, and in this embodiment, the position x of the hole 6 of the cylindrical container 3 (the height from the oil overflow pipe 9 is The height difference x is equal to (H−x) + ρx = h (gw / cm ² ) when the specific gravity of water is 1 and the specific gravity of oil is ρ.

[0008]

[Formula 1] x = (H−h) / (1−ρ)

It is designed to be represented by the equation 1, which is designed so that x = 12.5 cm when the specific gravity of oil is 0.8, h is 100 cm, and H is 102.5 cm. At this time, the thickness of the water layer is 90 cm and the thickness of the oil layer is 12.5 cm. This height difference x is a value that maximizes the thickness of the oil layer in a stable state, and if the hole 6 is set at a position lower than this, the mixed liquid will flow out from the container 3 toward the oil layer. Can be prevented.

Next, FIG. 2 shows a second embodiment of the present invention, in which a bottomed columnar primary processing container 10a made of synthetic resin is connected to the primary processing container 10a at a lower side surface portion. The container is a cylindrical container for forming the entire container into an L-shape, and an upper part of the primary processing container 10a of the container 10 is provided with an annular portion 12 continuously so as to form a circular hole inside. The circumference of the circular hole of the annular portion 12 is twisted. Reference numeral 14 denotes a container formed by integral molding and having a bottomed cylindrical shape, and a flange 16 on the upper part, and the center of the bottom portion of which is projected in a cylindrical shape, and the lower peripheral surface of the flange 16 of the container 14 is twisted. Is fixed to the annular portion 12 of the primary processing container 10 by screwing. A hole 18 communicating with the inside of the primary processing container is provided below the side wall of the container 14 as in the first embodiment, and an air passage hole for communicating with the inside of the container 10 is provided above the container side wall.
20 is open. The position of the oil overflow pipe 9 is set to the same height as in the above-mentioned embodiment, and the position of the hole 18 is also determined by the relationship with the specific gravity of the oil. In this embodiment, the ceiling wall surface 19 forming the secondary processing container 10b is formed in a tapered shape so as to be higher toward the primary processing container 10a.

Furthermore, in the oil overflow pipe 9 of the first and second embodiments, the outer peripheral surface of the tip of the pipe 9 is twisted so that there is no problem even if a difference occurs in the specific gravity of the oil used for oil separation. The pipe 9a and the pipe 9b whose inner peripheral surface has been twisted are joined by screwing, and the specific gravity of the oil is
The height is increased when it is less than 0.8, and the height is decreased when it is greater than 0.8. The height adjustment of the overflow pipe 9 is not limited to that of this embodiment, and as shown in FIG. 3, an O-ring is provided on the upper portion of the outer peripheral surface of the pipe 9a.
25 may be embedded and a pipe 9b having an inner diameter slightly wider than the outer diameter of the pipe 9a may be fitted into the pipe 9a to be fixed. Further, the height of the water overflow pipe 8 may be adjusted instead of the oil overflow pipe. Therefore, when the positions of the water overflow pipe 8 and the hole 6 are fixed, it is necessary to appropriately adjust the height H of the oil overflow pipe 9 in relation to the specific gravity of oil, and when the specific gravity ρ is 0.75, 0.85, and 0.90, respectively. The heights H are 103.3, 101.8, and 101.1 cm, respectively, when (H-h) = 90 cm and h = 100 cm are inserted in the equation 1, and the pipe 9b may be adjusted to have such heights.

As described above, in the apparatus according to the present embodiment, the mixed water injected from the water injection port comes into contact with the inclined surface (side surface of the cone) of the columnar member to form a flow along the surface of the columnar member and scatter. The water in the container 3 flows without stirring without being stirred, is discharged into the container 1 (or 10) through the hole 6, and is accumulated in the container 1 while being separated into water and oil layers. In this embodiment, because the difference in the head of the water overflow pipe 8 is set to h, the sum of the pressures of the water layer and the oil layer in the container does not overflow until the head pressure is overcome. Further, the height of the water layer does not become higher than h, and when the oil layer is small, water begins to flow from the water overflow pipe 8 first, the oil layer gradually thickens, and finally the oil layer is included. The height becomes H, and water and oil are discharged from the oil overflow pipe 9, respectively.

When the water layer is small and the oil layer is large, the sum of the pressures of the water layer and the oil layer cannot overcome this head pressure, so that the height of the layer gradually increases. When the height becomes H, the oil starts to flow out from the oil overflow pipe 9, and the water layer gradually thickens, and when the oil layer becomes x, water and oil are discharged from the water overflow pipe 8 and the oil overflow pipe 9, respectively. Will be done.
In the present embodiment, since the columnar object 4 is provided in the container 3, when the liquid level rises above the height of the columnar object 4,
Since the cross-sectional area of the container 1 becomes narrow, the rate of rise of the liquid increases, the liquid level height can be increased with a small amount of raw water, and the separation of the oil layer can be promoted. In the apparatus of this embodiment, since the cross-sectional area of the bottom of the closed container is wide due to the presence of the secondary treatment container, the residence time of the mixed water can be lengthened and the separation of water and oil will be promoted. .

[0014]

As described above, the oil-water separator according to the present invention promotes the separation of water and oil by prolonging the residence time of mixed water so that the thicknesses of the oil layer and the water layer are automatically made constant. In addition to the above-mentioned adjustment, the thickness of both layers is made to overflow by the increased amount, so that oil and water can be separated efficiently and reliably.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an apparatus according to a second embodiment of the present invention.

FIG. 3 is a partial vertical cross-sectional view showing a height adjusting mechanism of an oil overflow pipe in the devices according to the first and second embodiments.

[Explanation of symbols]

 1 container 2 water injection port 3 bottomed cylindrical container 4 columnar object 5 side wall surface 6 hole 7 air passage hole 8 water overflow pipe 9 oil overflow pipe 10 container 12 annular portion 14 container 16 flange 18 hole 19 ceiling wall surface 20 air passage hole 22 Partition plate 24, 26 Communication hole 25 O-ring

Claims (4)

[Claims] 1. A closed container comprising a hollow columnar primary treatment container having a water injection port at the center of the ceiling and a secondary treatment container continuously provided below the side surface of the primary treatment container to form an L-shaped outer shape of the container. A water overflow pipe having a suction port near the bottom of the secondary treatment container of the closed container and protruding to the outside with a height difference up to a predetermined height h in the closed container;
At a predetermined lifting height H in the primary treatment container, one end is opened toward the upper part, and the other end is opened below toward the container overflow port and an oil overflow pipe protruding outside the container. The bottomed cylindrical container mounted on the ceiling wall surface and the columnar object having an inclined surface at the top mounted on the bottom of the cylindrical container, and water is poured on the lower side surface of the bottomed cylindrical container. The mixed water into a closed container.
Because the hole is provided in the primary treatment vessel and secondary treatment vessel is partitioned via the partition plate, oil-water separation apparatus, wherein a communication hole is drilled in the top and bottom of the partition plate. 2. The position of the hole provided on the lower side surface of the bottomed cylindrical container, in relation to the heights H and h of the oil and water overflow pipes, corresponds to the position of the hole and the opening of the oil overflow pipe. The difference x from the position H is x ≧ (H−h) /
The oil-water separator according to claim 1, wherein the oil-water separator is formed so as to be (1-ρ). 3. The oil-water separator according to claim 1, wherein the ceiling wall of the secondary treatment container is formed in a tapered shape so as to be higher toward the primary treatment container. 4. The oil-water separator according to claim 1, wherein the inclined surface of the columnar object is formed in a tapered shape.