CN216677076U

CN216677076U - Online centrifugal oil-water separator

Info

Publication number: CN216677076U
Application number: CN202120799902.1U
Authority: CN
Inventors: 潘帅廷; 杨志
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-06-07
Anticipated expiration: 2031-04-19

Abstract

The utility model discloses an online centrifugal oil-water separator which comprises a centrifuge shell, a centrifuge end cover, a centrifugal separation rotating wheel, a water control circular partition plate and a liquid inlet distributor. The inside and outside of the circle center of the centrifuge shell are respectively provided with a liquid inlet distributor and a liquid inlet, and an outlet of the liquid inlet distributor is designed in an offset mode. The oil phase outlet is positioned at the radius of the outer side of the liquid inlet distributor and has a difference of 90 degrees with the outlet of the liquid inlet distributor. The water control circular ring partition plate is fixed on the inner side edge of the shell of the centrifuge and divides the volume between the edge of the impeller and the shell into a plurality of circular volumes. The centrifugal separation rotating wheel is provided with a plurality of small separation cavities, and oil phases on the inner sides of the separation cavities are communicated with each other and used for volume compensation during liquid inlet and discharge. In the centrifugal oil-water separator, the liquid inlet distributor and the offset oil phase outlet are arranged to separate liquid inlet and liquid outlet, so that the influence of the fluctuation of liquid inlet amount and water content on the separation efficiency is prevented. After entering the closed centrifugal stage, the disturbance in the separation process is reduced, and the oil and the water are fully separated.

Description

Online centrifugal oil-water separator

Technical Field

The utility model is used for oil-water separation in oil exploitation, and particularly relates to an online centrifugal oil-water separator.

Background

At present, the oil-water separation of the offshore platform mostly adopts a multi-stage gravity separation and electric dehydration process, although the efficiency is higher, the separation effect on emulsified oil is poorer, the occupied space is larger, and the construction cost of the platform is greatly increased.

Disclosure of Invention

In order to dewater crude oil in a volume as small as possible and increase the adaptability to water content fluctuation and emulsified oil, the utility model provides the on-line centrifugal oil-water separator which can greatly reduce the volume compared with a gravity settling separator and improve the speed of oil-water separation.

The scheme adopted by the utility model for solving the technical problem is as follows: the principle of centrifugal dehydration is mainly to utilize the specific gravity difference between oil and water, and the specific gravity difference is enlarged by centrifugation. The method comprises the following steps: the centrifugal machine comprises a centrifugal machine shell, a centrifugal machine end cover, a centrifugal separation rotating wheel with a plurality of partition plates, a water control circular partition plate and a liquid inlet distributor.

The online centrifugal separator shell comprises a liquid inlet, an oil phase outlet and a water phase outlet. The liquid inlet of the online centrifugal separator is positioned on the circle center of the impeller, the requirement on inlet pressure can be reduced through centrifugal action, and overlarge inlet-outlet pressure drop during oil discharge is avoided. The oil phase outlet is located the feed liquor distributor outside radius, and the phase position is in the first two check of feed liquor distributor outlet, prevents that the feed liquor from directly scurrying to the leakage fluid dram to guarantee that oil outlet moisture content is lower, cooperate oil phase outlet flow control valve in order to adapt to the change of flow. The water is thrown to the circumferential edge and enters the water control circular ring partition plate to form a water ring, the water phase outlet is positioned at the circumferential edge and is matched with the outlet flow control valve to control the thickness of the water ring, and the thickness of the water ring is indirectly obtained by measuring the pressure generated by centrifugation at the water outlet and can also be measured by installing an oil-water interface instrument.

The feed liquid distributor is located inside the inlet of the centrifuge housing and is of a cylindrical design. The liquid outlet of distributor is located one side of circumference, and is the rectangle, and its length and width is the same with the feed liquor runner length and width that each check divide the liquid chamber, and the purpose that sets up this distributor lets the separation chamber of each cell advance the flowing back and can separately go on through the feed liquor distributor export of design biasing, prevents that feed liquor volume and feed liquor moisture content are undulant to cause the drop of water not just to be taken away by the oil phase by the separation, improves the water oil separating degree. A liquid inlet sealing ring is arranged between the inlet of the centrifugal separation rotating wheel and the inlet of the shell of the centrifugal machine, so that liquid inlet is prevented from flowing to the oil phase outlet. The center of the liquid inlet distributor is designed into a circular arch shape, an assembly space is reserved for a centrifugal separation runner nut, and meanwhile, the liquid inlet distributor is streamline and can reduce liquid inlet resistance.

The centrifugal machine end cover is used for assembling the centrifugal separation rotating wheel and further comprises a shaft sealing ring and a bearing at the driving end of the centrifugal separation rotating wheel.

The water control circular ring partition plate is welded and fixed on the inner side edge of the shell of the centrifuge, the volume between the edge of the impeller and the shell is divided into a plurality of circular volumes through parallel arrangement, and separation efficiency reduction caused by the fact that the separated water is rolled up and taken away due to the vortex formed by liquid inlet and discharge can be effectively reduced.

The centrifugal separation rotating wheel is radially divided into a plurality of small separation cavities in order to inhibit circumferential disturbance in the separation process, liquid is fed into each separation cavity in turn in the rotating process, then the centrifugal separation rotating wheel is sealed for centrifugation, and liquid is discharged after the centrifugal separation rotating wheel rotates for three quarters of a week. One side of each separation cavity of the rotating wheel, which is close to the driving shaft, is provided with a liquid inlet flow channel. The exit position of feed liquor runner is located the outside of separation chamber, and the linear velocity is the biggest here, and profit can quick separation, also has certain distance apart from the profit export simultaneously, and the feed liquor is undulant has certain buffering time, prevents that oil phase from running water or aqueous phase from running oil. The water separated from the separation cavity is thrown to the edge, the oil flows to the oil phase outlet in the direction of the circle center and is discharged, and the oil phases on the inner sides of the separation cavity are communicated with each other for volume compensation during liquid feeding and discharging. In order to reduce the resistance of the liquid inlet flowing to the separation cavity along the axial direction from the liquid inlet flow channel, the radius of the partition plate between the liquid inlet flow channel and the separation cavity is shorter than that of the two sides, so that the sum of the distance between the centrifugal separation rotating wheel and the water control circular partition plate and the radius difference of the partition plate is equal to the width of the liquid inlet flow channel, and the axial flow area is ensured. The motor has high rotating speed, and although the residence time of the liquid inlet in the centrifuge is in the order of seconds, the liquid inlet and outlet amount of each grid is relatively small every revolution, namely the distance of water drops is relatively short, the stabilizing speed is high, and the separating speed of the centrifuge can be three orders of magnitude higher than that under the gravity.

Advantageous effects

The utility model provides an on-line centrifugal oil-water separator. The method has the following beneficial effects:

(1) this centrifugal oil water separator lets advance the flowing back separately through setting up feed liquor distributor and rather than having the oil phase export of certain contained angle, prevents that feed liquor volume and feed liquor moisture content fluctuation from causing the drop of water not just to be taken away by the oil phase by the separation. After entering the closed centrifugal stage, the disturbance in the separation process is reduced, the oil and the water can be fully separated, and the adaptability to different production working conditions is improved.

(2) The oil phases at the inner sides of the separation cavities are communicated with each other, so that the volume compensation during liquid inlet and discharge is realized, the liquid inlet and discharge can be continuously performed, and the fluctuation of upstream and downstream is reduced.

(3) The centrifugal oil-water separator greatly reduces the occupied space while ensuring the separation efficiency.

Drawings

FIG. 1 is a schematic diagram of an overall structure of an on-line centrifugal oil-water separator according to the present invention;

FIG. 2 is a schematic side sectional view of an on-line centrifugal oil-water separator according to the present invention;

FIG. 3 is a schematic view of a partial structure of the centrifugal separation wheel according to the present invention;

figure 4 is a schematic diagram of the feed distributor of the present invention.

Illustration of the drawings:

1. a housing; 2. an end cap; 3. centrifugal separation runner; 31. a liquid inlet flow passage partition plate; 32. a separation chamber partition; 4. a water control ring baffle; 5. a liquid inlet distributor; 51. an outlet of the feed liquor distributor; 52. an inlet of a liquid inlet distributor; 6. a liquid inlet; 7. an oil phase outlet; 8. a water phase outlet; 9. A liquid inlet sealing ring; 10. a shaft seal ring; 11. a bearing; 12. a shaft; 13. centrifugally separating the runner nut; 14. and a shaft sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

An on-line centrifugal oil-water separator comprises a centrifuge shell 1, a centrifuge end cover 2, a centrifugal separation rotating wheel 3 with multiple partition plates, a water control circular partition plate 4 and a liquid inlet distributor 5.

As shown in fig. 1 and 2, the liquid inlet distributor 5 and the liquid inlet 6 are respectively located on the inner side and the outer side of the circle center of the centrifuge shell 1; the oil phase outlet 7 is in offset design and is positioned at the outer radius of the liquid inlet distributor 5; the water phase outlet 8 is located at the peripheral edge at the same angle as the oil phase outlet 7. The water control circular partition plates 4 are arranged in parallel and welded on the inner edge of the centrifuge shell 1, and no welding is carried out at the water phase outlet 8, so that the water is convenient to drain. The centrifuge shell 1 and the end cover 2 are fixed through bolts.

As shown in fig. 2 and 3, the centrifugal separation rotor 3 is axially divided into a liquid inlet flow passage and a separation chamber. In order to inhibit circumferential disturbance in the separation process, the centrifugal separation rotating wheel is radially divided into a plurality of small lattices by liquid inlet flow channel partition plates 31 and separation cavity partition plates 32, liquid is fed into each separation cavity in turn in the rotating process, then the centrifugal separation rotating wheel is sealed, and liquid is discharged after the centrifugal separation rotating wheel rotates for three quarters of a week. The exit position of feed liquor runner is located the outside of separation chamber, and here centrifugal speed is very fast, but oil water flash separation also has certain distance apart from the oil water export simultaneously, and the feed liquor is undulant has certain buffering time, prevents that oil phase water leakage or aqueous phase oil leakage. The water separated from the separation cavity is thrown to the edge, the oil flows to the oil phase outlet in the direction of the circle center and is discharged, and the oil phases on the inner sides of the separation cavity are communicated with each other for volume compensation during liquid feeding and discharging. In order to reduce the resistance of the liquid inlet flowing to the separation cavity along the axial direction from the liquid inlet flow channel, the diameter of a partition plate between the liquid inlet flow channel and the separation cavity is slightly shorter than that of the partition plate on the two sides, so that the axial flow area is ensured. The centrifugal separation rotating wheel 3 is assembled on the end cover 2 through a shaft 12 and locked by a nut 13, and a shaft sleeve 14 is arranged on the shaft 12 to protect the main shaft and reduce abrasion. The shaft seal ring 10 is used for sealing the medium inside the online centrifugal oil-water separator, and is matched with a bearing 11. A liquid inlet sealing ring 9 is arranged between the edge of the liquid inlet at the inner side of the centrifugal separation rotating wheel 3 and the center of the shell 1 of the centrifugal machine, so that liquid inlet is prevented from flowing to an oil phase outlet.

As shown in fig. 4, the inlet distributor 5 is designed with a dome-shaped concave pit near the centrifugal separation wheel 3 to leave an assembly space for the centrifugal separation wheel nut 13, and the streamline shape can reduce the inlet resistance. The outlet 51 of the feed distributor is offset, and has an included angle of 45 degrees, and the area shape of the outlet is the same as that of the inlet of each feed channel.

The working principle is as follows: the crude oil containing water enters the online oil-water separator from the liquid inlet 6 and is then distributed to the liquid inlet flow channel on the side through the outlet 51 of the liquid inlet distributor 5, and the liquid inlet flow channel is separated by the liquid inlet flow channel partition plate 31. The aqueous crude oil flows from the inlet channel and enters the outer edge of the separation chamber, which is separated by a separation chamber partition 32. When the centrifugal separation wheel 3 rotates anticlockwise as shown in fig. 1, the liquid inlet flow channel rotates through the outlet 51 of the liquid inlet distributor, the small-cell separation cavity enters a closed period, oil and water are separated in the period, water is thrown to the circumferential edge and enters between the water control circular partition plates 4, and oil is arranged on the inner side of the separation cavity. When the inner edge of the separation cavity rotates to the position of the oil phase outlet 7, the online oil-water separator discharges oil, the water phase outlet 8 discharges water according to the thickness of the water ring, the thickness of the water ring is indirectly obtained by measuring the pressure generated by centrifugation at the water phase outlet 8, and an oil-water interface instrument can be installed for measurement. The design of the water control ring baffle plate 4 can prevent the separated water or oil from being remixed by the generated vortex during liquid discharge to reduce the separation efficiency. Because the total number of the separation cavities is 8, the included angle of each separation cavity is 45 degrees, in order to prevent the liquid inlet and the liquid outlet from flowing, the difference between the central line of the outlet 51 of the liquid inlet distributor and the central line of the oil phase outlet 7 is 90 degrees, and the separation cavity between the outlet 51 of the liquid inlet distributor and the oil phase outlet 7 finishes the next circulation of the liquid discharge. In order to ensure the water control effect, the gap between the centrifugal separation rotating wheel 3 and the water control circular ring clapboard 4 is smaller. In order to reduce the resistance of the liquid inlet flowing to the separation cavity along the axial direction from the liquid inlet flow channel, the diameter of a partition plate between the liquid inlet flow channel and the separation cavity is slightly shorter than that of the partition plate on the two sides, so that the axial flow area is ensured.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. An online centrifugal oil-water separator is characterized by comprising a centrifuge shell (1), a centrifuge end cover (2) and a centrifugal separation rotating wheel (3); the centrifugal machine is characterized in that a liquid inlet distributor (5) and a liquid inlet (6) are respectively arranged on the inner side and the outer side of the circle center of the centrifugal machine shell (1), an oil phase outlet (7) is designed in a bias mode, the oil phase outlet is located on the outer side radius of the liquid inlet distributor (5), a water phase outlet (8) is located on the edge of the circumference and is at the same angle with the oil phase outlet (7), and the centrifugal machine shell (1) and the end cover (2) are fixed through bolts.

2. An in-line centrifugal oil-water separator as claimed in claim 1, further comprising a water control ring baffle (4); the water control circular partition plates (4) are arranged in parallel and welded on the inner edge of the centrifuge shell (1), and no welding is carried out at the position of the water phase outlet (8).

3. An in-line centrifugal separator as claimed in claim 1 further comprising a feed distributor (5); a circular arch-shaped pit is designed at one side of the liquid inlet distributor (5) close to the centrifugal separation rotating wheel (3); the outlet (51) of the liquid inlet distributor is designed in an offset mode, the included angle of an opening is 45 degrees, and the area shape of the outlet is the same as that of the inlet of each liquid inlet flow channel.

4. An in-line centrifugal oil-water separator as claimed in claim 1, further comprising a centrifugal separation wheel (3) with multiple partitions; the centrifugal separation rotating wheel (3) is axially divided into a liquid inlet flow channel and a separation cavity; the centrifugal separation rotating wheel is radially divided into a plurality of small lattices by a liquid inlet flow channel partition plate (31) and a separation cavity partition plate (32), liquid is alternately fed into each separation cavity in the rotating process, then the centrifugal separation rotating wheel is sealed and centrifuged, and liquid is discharged after the centrifugal separation rotating wheel rotates for three quarters of a week; the outlet of the liquid inlet flow channel is positioned at the outer side of the separation cavity; the oil phases at the inner sides of the separation cavities are communicated with each other; the radius of the partition plate between the liquid inlet flow channel and the separation cavity is shorter than that of the two sides, so that the sum of the distance between the centrifugal separation rotating wheel (3) and the water control circular partition plate (4) and the radius difference of the partition plate is equal to the width of the liquid inlet flow channel; the centrifugal separation rotating wheel (3) is assembled on the end cover (2) through a shaft (12) and locked by a nut (13), and a shaft sleeve (14) is arranged on the shaft (12); the shaft sealing ring (10) is used for sealing the medium in the on-line centrifugal oil-water separator, and is matched with a bearing (11).

5. An on-line centrifugal oil-water separator as claimed in claim 1, wherein a liquid inlet sealing ring (9) is arranged between the edge of the liquid inlet at the inner side of the centrifugal separation runner (3) and the center of the centrifugal machine shell (1) to prevent the liquid inlet from flowing to the oil phase outlet.