CN117919788A - Water-oil separator - Google Patents

Abstract

The invention relates to a water-oil separation device, which comprises a separation tank and a high-pressure pump, wherein the separation tank is provided with a liquid inlet, a vortex cavity, a first outlet, a second outlet and a third outlet which are communicated, each of the liquid inlet, the first outlet, the second outlet and the third outlet is communicated with the vortex cavity, the liquid inlet faces tangentially to the wall surface of the vortex cavity so that oil-containing liquid forms a vortex in the vortex cavity, the first outlet, the liquid inlet, the second outlet and the third outlet are sequentially arranged in a preset direction, and the outlet of the high-pressure pump is communicated with the liquid inlet so that the oil-containing liquid has pressure drop between the upstream and the downstream of the liquid inlet and cavitation effect occurs after entering the vortex cavity. The oil-water separation device provided by the invention thoroughly separates the oil phase from the water phase, ensures the separation time of the oil phase and the water phase by utilizing the vortex rotation of the liquid, and ensures the separation effect of the oil phase and the water phase.

Description

Water-oil separator

Technical Field

The invention relates to the technical field of oily sewage treatment, in particular to a water-oil separation device.

Background

The oil extraction and processing field produces oily sewage with oil content less than 5%, the oil is in an emulsified state and has suspended particles, and the oily sewage is difficult to treat. In the related art, common demulsification and deoiling methods for oily sewage comprise a centrifugal method, and the centrifugal method only depends on gravity separation, can not thoroughly demulsify emulsion, can not thoroughly separate the emulsion, has high water content in separated oil phase and high oil content in separated water phase, and is only suitable for occasions with small water content and limited occupied area.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides the water-oil separating device which separates the oil phase from the water phase by utilizing the cavitation effect, so that the oil phase and the water phase are thoroughly separated, the separation time of the oil phase and the water phase is ensured by utilizing the vortex rotation of the liquid, and the separation effect of the oil phase and the water phase is ensured.

The water-oil separation device of the embodiment of the invention comprises:

the separation tank is provided with a liquid inlet, a vortex cavity, a first outlet, a second outlet and a third outlet which are communicated, each of the liquid inlet, the first outlet, the second outlet and the third outlet is communicated with the vortex cavity, the liquid inlet is tangential to the wall surface of the vortex cavity so that oil-containing liquid forms a vortex in the vortex cavity, and the first outlet, the liquid inlet, the second outlet and the third outlet are sequentially arranged in a preset direction; and

And the outlet of the high-pressure pump is communicated with the liquid inlet, so that the oil-containing liquid has a pressure drop between the upstream and downstream of the liquid inlet and cavitation effect occurs after entering the vortex cavity.

The oil-water separation device provided by the embodiment of the invention separates the oil phase from the water phase by utilizing the cavitation effect, so that the oil phase and the water phase are thoroughly separated, the separation time of the oil phase and the water phase is ensured by utilizing the vortex rotation of the liquid, the separation effect of the oil phase and the water phase is ensured, and the oil-containing sewage separation device provided by the embodiment of the invention has the advantages of simple and compact structure, low cost and simplicity in operation.

In some embodiments, the water oil separation device further comprises a first vacuum pump, an inlet of the first vacuum pump being in communication with the first outlet.

In some embodiments, the separator tank further includes a oil separating chamber, one end of the oil separating chamber in the preset direction is provided with the first outlet, the other end of the oil separating chamber in the preset direction is connected with one end of the vortex chamber, the liquid inlet is located at the one end of the vortex chamber, and the diameter of the oil separating chamber is smaller than the diameter of the one end of the vortex chamber.

In some embodiments, the diameter of the oil distribution chamber is 0.25-0.5 times the diameter of the one end of the vortex chamber.

In some embodiments, the separator tank further comprises a vane, the vane being helical, the vane having a through bore extending axially therethrough, an outer edge of the vane being connected to a wall of the vortex chamber.

In some embodiments, the pitch angle of the blades is 10 ° -25 °, or 155 ° -170 °, and the number of turns of the blade is 2-4.

In some embodiments, the second outlet is oriented tangentially to the vortex chamber.

In some embodiments, the water oil separation device further comprises a second vacuum pump in communication with the second outlet.

In some embodiments, the water oil separator further comprises a blowdown pump in communication with the third outlet.

Drawings

FIG. 1 is a schematic view of a water-oil separator according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional structural view of a separator tank according to an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of a second embodiment of a separator tank according to an embodiment of the present invention;

FIG. 4 is a schematic view of the structure of a third embodiment of a separator tank according to an embodiment of the present invention;

FIG. 5 is a schematic view of a fourth embodiment of a separator tank according to an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of a fifth embodiment of a separator tank according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a sixth embodiment of a separator tank according to an embodiment of the present invention.

Reference numerals:

A water-oil separating device 100;

the device comprises a separation tank 1, a liquid inlet 11, a vortex cavity 12, a first outlet 13, a second outlet 14, a third outlet 15, a oil separating cavity 16 and blades 17;

A high-pressure pump 2;

A first vacuum pump 3, a second vacuum pump 4;

a first valve 51, a second valve 52, a third valve 53, a fourth valve 54.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

As shown in fig. 1 to 7, a water-oil separating apparatus 100 of an embodiment of the present invention includes a separation tank 1 and a high-pressure pump 2.

The separation tank 1 is provided with a liquid inlet 11, a vortex cavity 12, a first outlet 13, a second outlet 14 and a third outlet 15 which are communicated, each of the liquid inlet 11, the first outlet 13, the second outlet 14 and the third outlet 15 is communicated with the vortex cavity 12, the liquid inlet 11 is oriented tangentially to the wall surface of the vortex cavity 12 so that the oil-containing liquid forms a vortex in the vortex cavity 12, and the first outlet 13, the liquid inlet 11, the second outlet 14 and the third outlet 15 are sequentially arranged in a preset direction (for example, the up-down direction in fig. 1). The outlet of the high pressure pump 2 communicates with the inlet 11 such that there is a pressure drop of the oil-containing liquid between upstream and downstream of the inlet 11 and cavitation occurs after entering the swirl chamber 12.

When the water-oil separating device 100 of the embodiment of the present invention is used, the preset direction is the same as the up-down direction, the first outlet 13 is located at the upper end of the vortex chamber 12, the third outlet 15 is located at the bottom end of the vortex chamber 12, and the third outlet 15 is a normally closed outlet, that is, in a normal state, the third outlet 15 is closed, and the third outlet 15 is opened when needed. The inlet of the high-pressure pump 2 is communicated with a liquid storage tank filled with the oil-containing liquid to be separated, the oil-containing liquid is pressurized by the high-pressure pump 2 and then boosted, so that the pressure of the liquid between the outlet of the high-pressure pump 2 and the upstream of the liquid inlet 11 is increased. When the pressurized oil-containing liquid is discharged into the vortex cavity 12 from the liquid inlet 11, on one hand, the pressure of the oil-containing liquid is suddenly reduced, so that cavitation effect is generated on the liquid, a large number of cavitation bubbles are generated, the steady state of emulsified oil drops is broken, and the bubbles carry the oil drops to move upwards in the vortex cavity 12; on the other hand, the flow direction of the oil-containing liquid entering the vortex cavity 12 from the liquid inlet 11 is tangential to the wall surface of the vortex cavity 12, so that the oil-containing liquid generates vortex in the vortex cavity 12, the oil-containing liquid rotates along the wall surface of the vortex cavity 12 and flows downwards, the oil-containing liquid generates centrifugal force, the water phase and the particulate matters with higher density are positioned at the outer end of the centrifugal force field, the edge materials (namely the water phase and the particulate matters) move downwards, the air bubbles and the oil drops with lower density are positioned at the center of the centrifugal force field, and the center materials (namely the air bubbles and the oil drops) move upwards. The bubbles and oil drops moving upwards are discharged from the first outlet 13, part of the particles in the water phase moving downwards are wrapped by the water phase and discharged from the second outlet 14, and as the third outlet 15 is a normally closed outlet, a flow dead zone exists at the bottom end of the vortex cavity 12, part of the particles can be gradually deposited at the bottom end of the vortex cavity 12, and when the particles are deposited to a certain amount, the third outlet 15 is opened again to discharge the particles.

It should be noted that, when the oil-containing liquid to be separated does not contain particulate matters, the bottom end of the vortex cavity 12 will not deposit particulate matters, the second outlet 14 is a normally open outlet, the water phase discharged from the second outlet 14 also contains no particulate matters, and the third outlet 15 is normally closed and does not need to be opened.

It will be appreciated that when the oil-containing liquid to be separated does not contain particulates, it is not limited to the second outlet 14 being an aqueous phase discharge outlet, and in other embodiments, the second outlet 14 and/or the third outlet 15 being an aqueous phase discharge outlet, i.e., the aqueous phase may be discharged through the second outlet 14, through the third outlet 15, and through the second outlet 14 and the third outlet 15.

According to the oily sewage separation device disclosed by the embodiment of the invention, the oily liquid is pressurized by the high-pressure pump 2, so that cavitation effect is generated due to pressure drop when the liquid enters the vortex cavity 12, the steady state of emulsified oil is broken, the oil phase can be thoroughly separated from the water phase, and bubbles can carry the oil phase to float upwards and be discharged through the first outlet 13. The orientation of the liquid inlet 11 is tangential with the vortex cavity 12 to enable the oil-containing liquid to generate vortex after entering the vortex cavity 12, the liquid flows downwards in a vortex form, the flowing form of the vortex is orderly and regular, meanwhile, centrifugal force exists to enable bubbles and an oil phase to be located at the center of a centrifugal force field, the bubbles are convenient to carry the oil phase and the water phase to be separated, meanwhile, the vortex flows downwards to prolong the flowing time of the liquid in the vortex cavity 12, and a certain time is ensured to enable the bubbles to be fully separated from the water phase, so that the separation effect of the oil phase and the water phase is ensured.

Therefore, the oily sewage separation device provided by the embodiment of the invention separates the oil phase from the water phase by utilizing the cavitation effect, so that the oil phase and the water phase are thoroughly separated, the separation time of the oil phase and the water phase is ensured by utilizing the vortex rotation of the liquid, and the separation effect of the oil phase and the water phase is ensured.

In order to make the solution of the present application easier to understand, the preset direction and the up-down direction are described as examples, the up-down direction is shown in fig. 1 and 3 to 7, the up-down direction is also the axial direction of the vortex chamber, and the left-right direction is shown in fig. 1 and 3 to 7.

The water-oil separating apparatus 100 of the embodiment of the present invention includes a separation tank 1, a high-pressure pump 2, a first vacuum pump 3, a second vacuum pump 4, a sewage pump, a first valve 51, a second valve 52, a third valve 53, and a fourth valve 54.

The separation tank 1 is provided with a liquid inlet 11, a vortex cavity 12, a first outlet 13, a second outlet 14 and a third outlet 15 which are communicated, wherein each of the liquid inlet 11, the first outlet 13, the second outlet 14 and the third outlet 15 is communicated with the vortex cavity 12, the liquid inlet 11 is oriented tangentially to the wall surface of the vortex cavity 12 so that oil-containing liquid forms a vortex in the vortex cavity 12, and the first outlet 13, the liquid inlet 11, the second outlet 14 and the third outlet 15 are sequentially arranged in the preset direction. Referring to fig. 1, the first outlet 13 is located at the top end of the separation tank 1, and the third outlet 15 is located at the bottom end of the separation tank 1.

The first valve 51 is disposed at the liquid inlet 11, the outlet of the first valve 51 is communicated with the liquid inlet 11, and the first valve 51 controls the opening and closing of the liquid inlet 11. A second valve 52 is provided at the first outlet 13, the second valve 52 controlling the opening and closing of the first outlet 13. A third valve 53 is provided at the second outlet 14, the third valve 53 controlling the opening and closing of the second outlet 14. A fourth valve 54 is provided at the third outlet 15, the fourth valve 54 controlling the opening and closing of the third outlet 15.

The outlet of the high pressure pump 2 communicates with the inlet 11 such that there is a pressure drop of the oil-containing liquid between upstream and downstream of the inlet 11 and cavitation occurs after entering the swirl chamber 12.

Specifically, referring to fig. 1, the outlet of the high-pressure pump 2 communicates with the inlet of the first valve 51, and the outlet of the first valve 51 communicates with the liquid inlet 11.

In some embodiments, the outlet pressure of the high pressure pump 2 ranges from 0.3 to 1.0MPa at a temperature of 25-50 ℃.

The separation tank 1 further includes a separation chamber 16, one end (upper end) of the separation chamber 16 in the preset direction is provided with a first outlet 13, the other end (lower end) of the separation chamber 16 in the preset direction is connected to one end (upper end) of the swirl chamber 12, the liquid inlet 11 is located at the one end of the swirl chamber 12, and the diameter of the separation chamber 16 is smaller than the diameter of the one end of the swirl chamber 12.

The diameter of the oil separating cavity 16 is smaller than that of the one end of the vortex cavity 12, that is, the diameter of the oil separating cavity 16 through which the air bubbles carry the oil phase to float is smaller than that of the one end of the vortex cavity 12, and the diameter of the space through which the air bubbles float is reduced, so that the air bubbles can quickly fill the cavity, the speed of exhausting the air bubbles from the first outlet 13 is increased, that is, the speed of exhausting the oil phase is increased, the oil phase is prevented from being influenced by excessively long rupture in the air bubble floating process, and the thoroughly separating of the oil phase from the water phase is further ensured.

Further, the diameter of the oil separating cavity 16 is 0.25-0.5 times of the diameter of the end of the vortex cavity 12, namely, a space is provided for separating the cavitation-effect bubble carrying oil phase from the water phase, the bubble carrying oil phase is ensured to have a higher floating discharge speed, and the manufacturing and processing are simple.

For example, the diameter of the oil distributing chamber 16 is 0.25 times, 0.3 times, 0.4 times, 0.5 times the diameter of the one end of the swirl chamber 12.

The inlet of the first vacuum pump 3 communicates with the first outlet 13. Referring to fig. 1, the first outlet 13 communicates with an inlet of the second valve 52, and an outlet of the second valve 52 communicates with an inlet of the first vacuum.

The first vacuum pump 3 not only can accelerate the discharge of the oil phase of the first outlet 13, but also can extract a part of air in the vortex cavity 12, so that the cavity of the separation tank 1 (namely the vortex cavity 12 and the oil separating cavity 16) maintains a certain vacuum degree, the continuous occurrence time of cavitation effect is ensured, bubbles are ensured to be continuously generated after liquid enters the vortex cavity 12, and the separation effect of the oil phase and the water phase is further ensured.

The separator tank 1 further comprises a vane 17, the vane 17 being helical, the vane 17 having a through hole extending in its axial direction (also the preset direction), the outer edge of the vane 17 being connected to the wall of the swirl chamber 12. The spiral blades 17 guide downward vortex of the liquid, so that the flow path and the flow time of the liquid in the vortex cavity 12 are ensured, namely, the separation of the oil phase and the water phase carried by bubbles is ensured, and the separation effect of the oil phase and the water phase is further ensured.

The upper ends of the blades 17 are adapted to the flow direction of the vortex formed after the liquid is discharged from the liquid inlet 11.

Further, the pitch angle of the blades 17 is 10 DEG to 25 DEG or 155 DEG to 170 DEG, and the number of turns of the blades 17 is 2 to 4.

For example, referring to FIG. 1, the pitch angle of the vane 17 is 10 degrees positive (right-handed) and the number of turns is 4. Referring to fig. 3, the pitch angle of the vane 17 is 18 ° of positive spiral (right-handed) and the number of turns is 3. Referring to fig. 4, the pitch angle of the vane 17 is 25 ° of positive spiral (right-handed) and the number of turns is 2. Referring to fig. 5, the pitch angle of the vane 17 is 170 ° of the reverse spiral (left-hand) and the number of turns is 4. Referring to fig. 6, the pitch angle of the vane 17 is 162 ° of the reverse spiral (left-hand) and the number of turns is 3. Referring to fig. 7, the pitch angle of the vane 17 is 155 ° of reverse spiral (left-hand) and the number of turns is 2.

In some embodiments, the second outlet 14 is oriented tangentially to the vortex chamber 12, so that the liquid can be directly discharged from the second outlet 14 along the direction of the path of the vortex, thereby reducing energy loss caused by friction collision between the liquid and the wall surface of the second outlet 14 in the liquid discharging process and generating local turbulence, ensuring the stability of the vortex flow of the liquid, ensuring the separation of the oil phase and the water phase carried by bubbles, ensuring the smoothness of the liquid discharged from the second outlet 14, and further ensuring the separation effect of the oil phase and the water phase.

The second vacuum pump 4 communicates with the second outlet 14. Referring to fig. 1, the second outlet 14 communicates with an inlet of a third valve 53, and an outlet of the third valve 53 communicates with an inlet of the second vacuum pump 4. The second vacuum pump 4 has the capability of vacuumizing and pumping, so that the discharging speed of liquid from the second outlet 14 is controllable, and the second vacuum pump is matched with the first vacuum pump 3, thereby achieving the purpose of vacuumizing the vortex cavity 12 and the oil separating cavity 16, further ensuring the vacuum degree of the cavities (namely the vortex cavity 12 and the oil separating cavity 16) of the separating tank 1, further ensuring the continuous occurrence time of cavitation effect, further ensuring that bubbles can be continuously generated after the liquid enters the vortex cavity 12, and further ensuring the separation effect of oil phase and water phase.

In particular, the first vacuum pump 3 and the second vacuum pump 4 cooperate to maintain a pressure of 10-50KPa in the chambers of the separator tank 1 (i.e., the swirl chamber 12 and the oil distribution chamber 16).

A sewage pump (not shown) communicates with the third outlet 15. Specifically, the third outlet 15 communicates with an inlet of a fourth valve 54, and an outlet of the fourth valve 54 communicates with an inlet of the trapper.

When the bottom of the separation tank 1 (i.e., the vortex chamber 12 is adjacent to the third outlet 15) accumulates more particles to form sludge, the third outlet 15 is opened, the sewage pump is turned on, and the sludge is discharged through the sewage pump. The sludge discharge efficiency is high by the sewage pump.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (9)

1. A water-oil separator, comprising:

A separation tank (1), wherein the separation tank (1) is provided with a liquid inlet (11), a vortex cavity (12), a first outlet (13), a second outlet (14) and a third outlet (15) which are communicated, each of the liquid inlet (11), the first outlet (13), the second outlet (14) and the third outlet (15) is communicated with the vortex cavity (12), the liquid inlet (11) faces tangentially to the wall surface of the vortex cavity (12) so that oil-containing liquid forms vortex in the vortex cavity (12), and the first outlet (13), the liquid inlet (11), the second outlet (14) and the third outlet (15) are sequentially arranged in a preset direction; and

-A high pressure pump (2), the outlet of the high pressure pump (2) being in communication with the inlet (11) such that there is a pressure drop of the oil-containing liquid between upstream and downstream of the inlet (11) and cavitation occurs after entering the vortex chamber (12).

2. The water-oil separation device according to claim 1, further comprising a first vacuum pump (3), an inlet of the first vacuum pump (3) being in communication with the first outlet (13).

3. The water-oil separation device according to claim 2, characterized in that the separation tank (1) further comprises a separation chamber (16), one end of the separation chamber (16) in the preset direction is provided with the first outlet (13), the other end of the separation chamber (16) in the preset direction is connected with one end of the vortex chamber (12), the liquid inlet (11) is positioned at the one end of the vortex chamber (12), and the diameter of the separation chamber (16) is smaller than the diameter of the one end of the vortex chamber (12).

4. A water-oil separator according to claim 3, characterized in that the diameter of the oil separating chamber (16) is 0.25-0.5 times the diameter of the one end of the swirl chamber (12).

5. The water-oil separation device according to claim 1, characterized in that the separation tank (1) further comprises a vane (17), the vane (17) being helical, the vane (17) having a through hole extending in its axial direction, the outer edge of the vane (17) being connected to the wall of the swirl chamber (12).

6. A device for separating water and oil according to claim 5, characterized in that the pitch angle of the blades (17) is 10 ° -25 °, or 155 ° -170 °, the number of turns of the blade (17) being 2-4.

7. A water-oil separator according to claim 1, characterized in that the second outlet (14) is oriented tangentially to the swirl chamber (12).

8. The water-oil separation device according to claim 1, further comprising a second vacuum pump (4), the second vacuum pump (4) being in communication with the second outlet (14).

9. The water-oil separation device according to claim 1, further comprising a sewage pump, which is in communication with the third outlet (15).