CN115340147B

CN115340147B - Vertical multistage cyclone floating oily sewage treatment device and method

Info

Publication number: CN115340147B
Application number: CN202211112993.2A
Authority: CN
Inventors: 卢浩; 刘奇龙; 李裕东; 刘懿谦; 王宁; 朱华曈; 杨强
Original assignee: East China University of Science and Technology
Current assignee: East China University of Science and Technology
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2023-07-25
Anticipated expiration: 2042-09-14
Also published as: CN115340147A

Abstract

The invention discloses a vertical multistage cyclone floating oily sewage treatment device and a method. The first-stage separation assembly comprises a cyclone cylinder, and a spray head is arranged in the cyclone cylinder. Each of the intermediate stage separation assemblies and the tail stage separation assemblies comprises a water collecting bucket and a cyclone cylinder, wherein a spray head is arranged in the cyclone cylinder, and the lower part of the water collecting bucket in one intermediate stage/tail stage separation assembly extends into the cyclone cylinder in the same intermediate stage/tail stage separation assembly and is communicated with two or more spray heads in the cyclone cylinder. The outlet direction of each spray head is set approximately towards the tangential direction so as to form upward rotational flow, wherein a large number of tiny bubbles are dissolved in the oily sewage, and the oil drops are lifted and coalesced along with the rotational flow. The invention has the characteristics of low energy loss rate, high bubble utilization rate, compact structure, wide applicability and the like.

Description

Vertical multistage cyclone floating oily sewage treatment device and method

Technical Field

The invention belongs to the field of oil-water separation treatment equipment, and particularly relates to a vertical multistage cyclone floating oily sewage treatment device and method.

Background

At present, the conventional oily sewage treatment technology and equipment in the petroleum industry have the problems of low treatment efficiency, large occupied area and the like, and in addition, the development trend of continuous low oil price, cost reduction, efficiency enhancement, energy conservation and environmental protection is considered, so that the development, popularization and use of the efficient and compact oily sewage treatment technology and equipment are also promoted to be particularly urgent. As the development of the conventional water treatment technology is mature, the breakthrough improvement to a large extent is difficult. For this reason, researchers have considered that by combining a variety of conventional water treatment techniques, this is desired to achieve a compact and efficient goal. Among them, the air-float cyclone integrated (or cyclone float) treatment technology based on the combination of cyclone and air-float unit treatment technologies is the most attractive.

Typical devices for combining air flotation separation and cyclone separation technology are more, such as an inflatable hydrocyclone, a centrifugal flotation column, a cyclone inflatable flotation column, a centrifugal air flotation machine, a cyclone-static microbubble flotation column, a vertical cyclone flotation device and the like, wherein most devices select a strong cyclone centrifugal force field to be combined with the air flotation degreasing technology, and the defects are that the strong cyclone can cause secondary emulsification of oily sewage, the pressure drop of the device is large, and the stability of inlet flow is more demanding; the oil removing mechanism of the vertical cyclone flotation equipment is to enhance the collision and coalescence efficiency of oil drops and bubbles by using a weak cyclone centrifugal force field and increase the floating speed of the oil drops and bubbles, which is equivalent to strengthening the air flotation oil removing process. In order to improve the processing capacity under the condition of ensuring a certain occupied area, the current vertical cyclone floating equipment has developed to a scheme of performing multiple air floating and cyclone oil-water separation processes in a single vertical container, thereby generating a new generation of vertical multistage cyclone floating equipment.

Patent CN110902758B discloses a cyclone air-float oily sewage treatment device with variable stage number, but because the space in each separation zone is very large, the cyclone strength is severely dissipated in the radial direction and the axial direction, which affects the collision adhesion efficiency of bubbles and oil drops. The patent CN106865673A discloses a secondary rotational flow air floatation oily water treatment device, which reduces the attenuation of rotational flow strength by adding a conical plate. But due to the single inlet, the flow field in the separator is unevenly distributed, affecting the separation efficiency. The patent CN105621517B discloses an oily sewage cyclone air floatation separation device which has two stages of separation, but the two stages of devices are simply connected in series, so that cooperative treatment is not formed, and the requirements of compactness and high efficiency are difficult to meet.

In addition, the above patents have the disadvantage that the liquid flow direction in the main separation zone is downward swirling for most of the time, and the main disadvantage is that when the air flotation degreasing process is cooperated, the movement process of the gas is upward flotation, the water flow is downward swirling, the directions of the two water flows are opposite, and the bubbles are impacted by the downward liquid flow when the bubbles are lifted, so that the utilization efficiency of the bubbles is not high.

The existing vertical cyclone floating equipment is influenced by viscosity and wall friction in the flowing process of fluid, the angular velocity drops rapidly, the collision coalescence efficiency of oil drops and bubbles is reduced, and the oil-water separation effect is negatively influenced. If the scheme of increasing the number of tangential pipes is adopted, the difficulty in adjusting the operation parameters of the equipment in running is increased, and an automatic control system for parameters such as liquid level, flow and the like is required to be additionally arranged; the method of increasing the initial tangential velocity at the inlet can form stronger turbulence, and increases the probability of oil drop breaking and emulsification. Therefore, there is an urgent need in the field of vertical cyclone flotation devices to develop an oily sewage treatment device and method that can satisfy both multi-stage treatment and cyclone energy dissipation.

Disclosure of Invention

On one hand, in order to improve the oil removal effect, the invention provides the vertical multistage cyclone floating oily sewage treatment device, which realizes multistage series connection through the cooperation of the cyclone cylinder and the water collecting bucket, can improve the utilization efficiency of bubbles and reduce the kinetic energy loss of the cyclone.

The vertical multistage cyclone floating oily sewage treatment device comprises a shell, a first-stage separation assembly, a 0-N-stage intermediate-stage separation assembly and a tail-stage separation assembly which are sequentially arranged in the shell in series, wherein N is a natural number.

The first-stage separation assembly comprises a cyclone cylinder, wherein one or more spray heads for communicating with the sewage pipe are arranged in the cyclone cylinder.

Each of the intermediate stage separation assemblies and the tail stage separation assemblies comprises a water collecting bucket and a cyclone cylinder, wherein one or more spray heads are arranged in the cyclone cylinder, and the lower part of the water collecting bucket in one intermediate stage/tail stage separation assembly extends into the cyclone cylinder in the same intermediate stage/tail stage separation assembly and is communicated with one or more spray heads in the cyclone cylinder.

The shell and the cyclone cylinder of the first stage/each intermediate stage separation assembly form a first cavity/a middle cavity of the water collecting bucket communicated with the intermediate stage/the tail stage separation assembly of the next stage, and the shell and the cyclone cylinder of the tail stage separation assembly form a tail cavity which can be communicated with a water outlet.

The outlet direction of each spray head is set to be oriented/approximately oriented tangentially, so that the sprayed fluid can swirl in a swirl cylinder where the spray head is positioned to form upward swirl, wherein a large number of micro bubbles are dissolved in the oily water, and the oil drops are lifted along with the swirl and captured and assisted in coalescing.

Compared with the prior art, the invention realizes upward rotational flow in each rotational flow cylinder, so that the rotational flow direction and the floating direction of the bubbles are both in the same direction, the bubbles are prevented from being impacted by downward liquid flow when floating, the utilization efficiency of the bubbles is improved, and the oil removal effect is further improved.

And in the oil removal and separation process, the stable operation of the flow field can be maintained, so that the separation efficiency is ensured to be maintained at a stable and high level.

The fluid travelling path has a detour process of overflowing upwards from the cyclone cylinder and flowing downwards from the outer side of the cyclone cylinder, so that the overall hydraulic retention time is prolonged, the number of flotation chambers is increased, and the oil removal efficiency is further improved.

In addition, the oil-containing sewage treatment device is characterized in that the first-stage separation assembly, the 0-N-stage intermediate-stage separation assembly and the tail-stage separation assembly which are used for carrying out collaborative rotational flow and air floatation oil removal are combined together in series in a compact structure, so that the device can be miniaturized, and the device can be flexibly applied to places with limited deployment space.

Optionally, the shell is provided with: at least one oil drain and at least one air vent communicated to the head cavity, at least one oil drain and at least one air vent communicated to the intermediate cavity, and at least one oil drain and at least one air vent communicated to the tail cavity.

Optionally, a part of or all of the exhaust ports of the head cavity/middle cavity/tail cavity are communicated to a bubble generator, the output end of the bubble generator is tangent to the tank body and is respectively positioned below the cyclone cylinder in the head cavity or/and the cyclone cylinder in the middle cavity, so that the dissolved air water and the water carrying bubbles are supplemented to the fluid outside the cyclone cylinder in the corresponding cavity. Therefore, a system with more uniform bubble distribution is formed on the inner side and the outer side of the cyclone cylinder, bubbles and sewage can be fully mixed, and the oil removal efficiency is improved.

In addition, can also make the spiral in the cavity outside the whirl section of thick bamboo, and then the swirl intensity of the outside fluid of supplementary whirl section of thick bamboo improves whirl air supporting and removes oil efficiency in coordination.

Optionally, the inner side wall of the upper part of each cyclone cylinder is a conical surface, so that an upward closing structure is formed, and the attenuation of the cyclone strength is reduced.

Optionally, each water collecting bucket is a funnel structure comprising an opening part and a pipe part, so that a more stable drainage structure is formed, and the kinetic energy attenuation in the downward flowing process of fluid is reduced.

On the other hand, in order to improve the oil removal effect, the invention provides a multistage cyclone floating oily sewage treatment method which is used for the oily sewage treatment device.

The oily sewage treatment method comprises the following steps:

s10, introducing oily sewage containing dissolved gas into the first-stage separation assembly, tangentially spraying the oily sewage into a cyclone cylinder of the first-stage separation assembly to make rotation, separating out a large number of microbubbles, and mutually adhering and floating after oil drops collide with the bubbles;

s20, enabling oily sewage overflowed from a cyclone barrel of a first-stage separation assembly or a last-stage separation assembly to flow into a water collecting bucket of a next-stage separation assembly or a tail-stage separation assembly, and making a cyclone from the cyclone barrel which passes through the water collecting bucket and then is tangentially sprayed to the next-stage separation assembly;

s30, removing oil from the oily sewage through a tail separation assembly, and discharging the oily sewage; wherein:

oil-containing sewage is deoiled at least through a first-stage separation assembly and a tail-stage separation assembly;

and oil-containing sewage can be deoiled through a 0-N-level intermediate stage separation assembly between the first-level separation assembly and the tail-level separation assembly, wherein N is a natural number.

Optionally, the step S10 and the step S20 further include a step a: and introducing water dissolved with micro bubbles into the lower part of the cavity outside each cyclone cylinder so as to enhance air floatation oil removal.

Optionally, in the step a: the water carrying micro bubbles or dissolved gas is sprayed tangentially to enhance the efficiency of the cyclone air floatation in cooperation with oil removal.

Drawings

FIG. 1 is a schematic diagram of a vertical secondary cyclone oily wastewater treatment device according to an embodiment.

Fig. 2 is a schematic perspective view of a water collection bucket in an embodiment.

Fig. 3 is a schematic top view of a water distribution pipe according to an embodiment.

Fig. 4 is a schematic view of the flow of sewage in the vertical secondary cyclonic oily sewage treatment apparatus shown in fig. 1.

Fig. 5 is a schematic view of a vertical secondary cyclone oily wastewater treatment device according to another embodiment.

FIG. 6 is a schematic view of another embodiment of a vertical three-stage cyclonic oil-containing sewage treatment apparatus.

FIG. 7 is a schematic cross-sectional view of a swirl pot in an embodiment.

Description of the figure:

1. the device comprises a shell, a first cavity, a tail cavity, a 12 oil drain, a 13 water drain, a 14 air exhaust, a 15 oil collecting cover, a 16 air exhaust port and a 17 middle cavity.

2. The water collecting bucket comprises a water collecting bucket body, an opening part, an edge of the opening part, a pipe part and a communication hole.

3. Swirl pot, 30. Bottom wall, 31. First cone wall, 32. Second cone wall.

4. A spray head.

5. Sewer pipes 50. Socket holes for connection of sewer pipes.

6. Water distribution pipe 60, sleeve part 61 and branch pipe part.

7. Microbubble circulation system, 70, bubble generator, 71, multiphase flow pump, 72, bubble water spray head.

8. And a coalescing module.

Detailed Description

The invention is further described below with reference to the drawings and specific examples.

Referring to fig. 1, the vertical type secondary cyclone floating oily sewage treatment device of the present embodiment includes a housing 1 and a two-stage cyclone separation structure disposed in the housing 1.

A water collecting bucket 2 is arranged in the shell 1 to divide the inner space of the shell 1 into a head cavity 10 and a tail cavity 11.

The first cavity 10 and the tail cavity 11 are respectively provided with a cyclone cylinder 3, wherein the structures of the cyclone cylinders 3 are consistent or similar, the inner side wall of each cyclone cylinder 3 is a conical surface to form an upward closing structure, and the upper part of the cyclone cylinder 3 is open and is in a cup-shaped structure as a whole.

One or more spray heads 4 are provided in said swirl pot 3 in the head chamber 10 near its bottom, which spray heads 4 are adapted to communicate with the sewer pipe 5. Wherein the outlet direction of the spray head 4 is arranged towards or approximately towards tangential.

The arrangement of the sewer pipes 5 can be adapted.

The sewage containing oil is introduced into the cyclone cylinder 3 in the head chamber 10 through the sewage pipe 5 and is ejected from the nozzle 4. Since the spray head 4 faces or is approximately oriented tangentially, the sewage can push the liquid in the cyclone cylinder 3 to rotate in a tangential injection mode, so that spinning is realized.

As the external sewage is continuously poured into the cyclone cylinder 3, the sewage in the cyclone cylinder 3 swirls upward, and the dissolved gas in the sewage is separated out to generate smaller bubbles which also swirls upward and contacts/collides with the oil drops in the sewage and captures the oil drops, so that the oil drops follow the bubbles upward and coalesce to form an adherend with a smaller apparent density, and finally overflows from the opening in the upper part of the cyclone cylinder 3 into the head chamber 10.

In use, the centrifugal acceleration of the fluid ejected from the nozzle 4 in the swirl tube 3 in the head chamber 10 is controlled to be in the weak swirl range, typically 10 to 50g (g is gravity acceleration), and is preferably 10 to 25g in combination with air-float separation.

In the first chamber 10, an oil layer after oil-water separation floats on the upper layer of the water body.

An oil drain 12 is provided on the housing 1, and the oil drain 12 is communicated with the first chamber 10, so as to allow oil in the first chamber 10 to drain from the oil drain 12. Preferably, the opening position of the oil drain 12 communicated with the head chamber 10 is close to the upper part of the head chamber 10.

As shown in fig. 2, the water collection bucket 2 has a substantially funnel-shaped structure, and the edge 21 of the opening 20 is fixed to the inner wall of the housing 1. Optionally, said edge 21 of the scoop 2 is welded together seamlessly with the housing 1. Optionally, the rim 21 of the header 2 is flanged to the housing 1.

Alternatively, the inner side of the opening 20 of the header 2 is a smooth, inverted conical surface. Preferably, the taper angle θ of the opening 20 of the water collection bucket 2 is 100 to 120 degrees.

The lower part of the water collection bucket 2 is a pipe part 22 communicated with the opening part 20.

The side wall of the opening part 20 of the water collecting bucket 2 is inclined, has the function of smooth diversion and reduces energy loss. The sewage fluid in the head chamber 10 is collected downward to the pipe portion 22.

One or more spray heads 4 are provided in the cyclone barrel 3 in the tail chamber 11 near the bottom thereof. The pipe portion 22 of the water collection bucket 2 extends into the cyclone cylinder 3 in the tail cavity 11 and is communicated with the spray head 4 in the cyclone cylinder 3.

With reference to the swirling process in the swirl pot 3 in the head chamber 10 as described above, the swirling action is also generated when the fluid is ejected to the swirl pot 3 in the tail chamber 11, further separating the oil and water and overflowing from the upper opening into the tail chamber 11.

In the tail cavity 11, an oil layer after oil-water separation floats on the upper layer of the water body.

The shell 1 is provided with another oil drain port 12, and the oil drain port 12 is communicated with the tail cavity 11 and can allow oil in the tail cavity 11 to drain from the oil drain port 12. Preferably, the opening position of the oil drain 12 communicated with the tail cavity 11 is close to the upper part of the tail cavity 11.

The shell 1 is provided with a water outlet 13, and the water outlet 13 is communicated with the tail cavity 11 and can allow oil in the tail cavity 11 to be discharged from the water outlet 13. Optionally, the drain opening 13 is provided at/near the bottom of the tail chamber 11.

Further, the housing 1 is provided with an exhaust port 14 connected to the head chamber 10 and another exhaust port 14 connected to the tail chamber 11 for exhausting gas.

Preferably, the exhaust port 14 and the oil drain port 12 correspond to the head cavity 10/the tail cavity 11, and the opening position of the exhaust port 14 is higher than the opening position of the oil drain port 12 in height.

In some embodiments, a plurality of spray heads 4 are respectively arranged in the cyclone barrels 3 in the head cavity 10 and the tail cavity 11, and the spray heads 4 are connected with the sewage pipe 5 or the pipe part 22 of the water collecting bucket 2 by a water distribution pipe. Referring to fig. 2, the pipe portion 22 of the water collecting bucket 2 is provided with one or more communication holes 23 communicated with the water distribution pipe 6.

Referring to fig. 3, in some embodiments, the water distribution pipe 6 includes a sleeve portion 60 at a middle position and a plurality of branch pipe portions 61 connected to an outer side of the sleeve portion 60, wherein each branch pipe portion 61 is provided with a spray head 4.

In some embodiments, the number and opening positions of the communication holes 23 on the water collection bucket 2 correspond to the branch pipe portions 61 on the water collection bucket 2 one by one, wherein one communication hole 23 corresponds to one of the branch pipe portions 61. In other embodiments, the number of the communication holes 23 on the water collection bucket 2 may be different, and in this case, the branch pipe portions 61 on the water distribution pipe 6 may be configured to communicate with each other.

The sleeve portion 60 may be fitted over the communication hole 23 of the pipe portion 22 of the water collecting bucket 2, so that each branch pipe portion 61 communicates with the communication hole 23.

The sewage pipe 5 may be provided with a plurality of communication holes (not shown), and the water distribution pipe 6 and the sewage pipe 5 may be connected with reference to the above-described connection structure of the water distribution pipe 6 and the pipe portion 22 of the water collection bucket 2. Arrows C shown in fig. 3 indicate the discharge direction of the sewage.

Alternatively, the number of the branch pipe parts 61 is 2 to 6. Preferably, a plurality of the branch pipe parts 61 are uniformly arranged around the sleeve part 60. Preferably, the number of the branch pipe parts 61 is 4.

As set up above, the swirl field distributes more evenly, and the swirl field is more showing the promotion effect of oil drop-bubble collision adhesion.

The cyclone tube 3 in the first chamber 10 forms a first stage separation assembly, and the cyclone tube 3 in the tail chamber 11 forms a tail stage separation assembly.

In some embodiments, for ease of description, the tail separation assembly may be defined as including the header 2. In other embodiments, the primary separation assembly may also be defined as including the header 2. It is to be understood that the foregoing definition of the header 2 as a distinction between the components comprised by the first separation component or the components comprised by the last separation component is merely a descriptive distinction and is not a limitation of the technical solution, and the essential content and scope of the technical solution are the same/equivalent regardless of the description mode adopted.

In other embodiments, on the basis of the above embodiments, a micro-bubble circulation system 7 may be further disposed in the vertical secondary cyclone floating oily sewage treatment device, so as to supplement bubbles in the treatment device and enhance the oil removal effect.

As shown in fig. 1, the micro-bubble circulation system comprises a bubble generator 70 and a multiphase flow pump 71, wherein the multiphase flow pump 71 is communicated with the bubble generator 70 through a pipeline for conveying water, and the output end of the bubble generator 70 is communicated into the head cavity 10 through a pipeline so as to supplement bubbles.

In some embodiments, the exhaust ports 14 of the head chamber 10 and the tail chamber 11 are connected to the bubble generator 70, so as to recycle the separated gas.

In some embodiments, the drain port 13 on the housing 1 is in communication with the input of the multiphase flow pump 71 via a conduit to allow for water recycling.

In other embodiments, the above embodiments may also be combined, while achieving water and gas circulation.

Optionally, the bubble generator 70 is connected to a bubble water spray head 72 disposed at a middle, lower portion of the head chamber 10, or at a position near the water collection bucket 2 in the head chamber 10. The generated micro-bubble water is conveyed to the middle lower part of the first cavity 10, and then micro-bubbles are mixed into the fluid overflowed from the cyclone cylinder 3, so that the oil removing effect is further improved.

Optionally, referring to the ejection direction of the nozzle 4 in the cyclone cylinder 3, the outlet direction of the bubble water nozzle 72 is also set towards or approximately towards the tangential direction, so that the ejected fluid moves along the tangential direction, thereby realizing the swirl of the fluid outside the cyclone cylinder 3 and improving the oil and water removing effect.

Optionally, an oil collecting cover 15 is disposed in the head cavity 10. The oil collecting cover 15 is disposed on the upper side of the cyclone cylinder 3 in the head chamber 10, wherein: the oil collecting cover 15 and the cyclone cylinder 3 can be separated by a certain distance; the peripheral edge of the oil collecting cover 15 extends outwards by a certain extent relative to the opening at the upper part of the cyclone cylinder 3 so as to be blocked at the upper side of the cyclone cylinder 3; and, the oil drain 12 in the head chamber 10 is not lower in height than the lowest part of the oil collecting cover 15.

Optionally, the oil collecting cover 15 has an umbrella structure with an upward convex middle part, and its edge part is lower than its middle part. The oil drain 12 in the head chamber 10 is at least higher in height than the edge of the oil collection cap 15.

Under the certain isolation and shielding effects of the oil collecting cover 15, the disturbance of the fluid overflowing from the cyclone cylinder 3 in the first cavity 10 to the oil layer floating on the upper layer in the first cavity 10 is greatly reduced, so that the oil layer can be smoothly discharged from the oil drain port 12, and the water carrying layer can be prevented from being discharged from the oil drain port 12.

Optionally, in the tail chamber 11, the oil drain 12 and the air vent 14 are both located near the edge of the water collection bucket 2, so that they are located relatively high in the tail chamber 11 and both belong to the light phase drain for easy draining. In the rear chamber 11, the oil drain 12 and the air outlet 14 are also located at a height higher than the opening in the upper part of the swirl pot 3 in the rear chamber 11.

In the above embodiment, in the head chamber 10 and the tail chamber 11, the position of the exhaust port 14 is relatively higher than the position of the oil drain port 12 in height.

Optionally, a venting port 16 may be provided on top of the head chamber 10, based on the above embodiments. Each vent 14 is adapted to communicate with the bubble generator 70 to recycle the effluent gas, while the effluent gas vent 16 is adapted to release excess gas when necessary.

Preferably, a check valve (not shown) is provided on each pipe connecting each of the exhaust ports 14 and the bubble generator 70, so that the different exhaust ports 14 are not communicated with each other. In this way, the exhausted gas can be exhausted only to the bubble generator 70, and the mutual influence of the different exhaust ports 14 due to the factors such as pressure difference or exhaust amount can be prevented under the condition of mutual communication.

Alternatively, the sewer pipe 5 penetrates the interior cavity of the housing 1 from below the housing 1. The cyclone cylinder 3 and the middle part of the water collecting bucket 2 are provided with sleeve holes for allowing the sewage pipe 5 to pass through.

Referring to fig. 2, a socket hole 50 for socket-connecting with the sewage pipe 5 is provided at a central position of the bottom of the pipe portion 22 of the sump 2. Likewise, a socket hole (not shown in the figure) may be provided at the bottom of the cyclone cylinder 3.

As set up above, oily sewage treatment plant is specific compact structure, has improved space utilization, under the limited circumstances of space resource, can realize the miniaturization of equipment, consequently possesses better field adaptability.

Preferably, the cyclone cylinder 3 and the sleeve joint hole 50 of the water collecting bucket 2 are in sealing connection with the outer wall of the sewage pipe 5, or are welded in a seamless manner.

Referring to fig. 4, the general travelling direction of the sewage after entering the oily sewage treatment device is shown as arrow b in the figure, in the first-stage separation assembly and the tail-stage separation assembly, the sewage sequentially passes through the cyclone cylinder 3, the space outside the cyclone cylinder 3 and the water collecting bucket 2, the overall path of the sewage is roundabout up and down, a longer path is provided for oil removal, the cyclone and air floatation collaborative oil removal is realized on each section of path, and the oil removal water capacity of the whole equipment is improved. It will be readily appreciated that the path shown by arrow b is a general, schematic forward path and not a true fluid path, in which swirl is omitted.

Referring to fig. 5, in other embodiments, a coalescing module 8 is disposed within the tail chamber 11. Wherein the coalescing module 8 is used as a last section oil removing device of the oily sewage treatment device, and sewage discharged from the tail separation assembly is discharged from the drain outlet 13 after further removing tiny oil drops when passing through the coalescing module 8.

The coalescing module 8 may be a structure filled with oleophilic, hydrophilic multi-scale particles, or other structures that exist.

In the embodiments of the present invention, the first stage separation assembly and the tail stage separation assembly are relative divisions of the cyclone separation device mainly composed of the cyclone cylinder 3 (or also including the water collection bucket 2), and thus, "first", "last" are not limited to "first" or "last". In some embodiments, other separation devices of the same type or different types may also be provided both before and after the first stage separation assembly and the tail stage separation assembly.

Similarly, in other embodiments, one or more stages of separation modules may be provided between the leading and trailing stages of separation modules.

Referring to fig. 6, the vertical three-stage cyclone floating oily sewage treatment device of the present embodiment is the same as the vertical two-stage cyclone floating oily sewage treatment device of the above embodiments in its entirety, and is mainly different in that a first-stage intermediate separation device is further provided between the first-stage separation assembly and the tail-stage separation assembly.

Two water collecting hoppers 2 which are arranged at intervals up and down are arranged in the shell 1, and the inner cavity of the shell 1 is divided into a first cavity 10, a tail cavity 11 and a middle cavity 17 between the first cavity 10 and the tail cavity 11.

Also provided in the intermediate chamber 17 is a swirl pot 3 as provided in the tail chamber 11, one or more spray heads 4 being provided in the swirl pot 3 near the bottom thereof.

With reference to the description of the above embodiments, the cyclone cartridge 3 in the head chamber 10 constitutes a head stage separation assembly, the cyclone cartridge 3 in the tail chamber 11 constitutes a tail stage separation assembly, and the cyclone cartridge 3 in the intermediate chamber 17 constitutes an intermediate stage separation assembly.

When the header 2 between the head chamber 10 and the intermediate chamber 17 is regarded as one of the components of the intermediate stage separation assembly, and the header 2 between the tail chamber 11 and the intermediate chamber 17 is regarded as one of the components of the tail stage separation assembly, the intermediate stage separation assembly and the tail stage separation assembly are structurally identical, except for the difference in the positions where the coupling objects are located and the front-rear coupling objects are different, wherein: the first stage separation assembly, the intermediate stage separation assembly and the tail stage separation assembly are coupled in series in sequence by means of said pipe portion 22 of the header 2 between adjacent two.

Modifications can also be made in accordance with the above embodiments, resulting in further embodiments as follows:

and a second-stage intermediate-stage separation assembly can be arranged between the first-stage separation assembly and the tail-stage separation assembly, so that the structure of the first-stage separation assembly, the intermediate-stage separation assembly and the tail-stage separation assembly is formed in the oily sewage treatment device.

And a plurality of stages of intermediate separation assemblies can be arranged between the first stage separation assembly and the tail stage separation assembly, so that the structure of the first stage separation assembly-intermediate stage separation assembly- … … -intermediate stage separation assembly-tail stage separation assembly is formed in the oily sewage treatment device.

Each intermediate stage separation assembly comprises a water collection bucket 2, and a plurality of intermediate chambers 17 are further separated between the head chamber 10 and the tail chamber 11.

The casing 1 is provided with a plurality of oil drain ports 12 and a plurality of air exhaust ports 14 which are communicated with the intermediate chambers 17 and correspond to the intermediate chambers 17 in number and position. The oil drain 12 and the air exhaust 14 corresponding to each intermediate chamber 17 may be set with reference to the oil drain 12 and the air exhaust 14 in the tail chamber 11.

Optionally, the exhaust port 14 of each intermediate chamber 17 is connected to the bubble generator 70 for recycling the evolved gas.

Optionally, the bubble generator 70 is connected to a bubble water spray head 72 provided at a middle, lower portion of each of the intermediate chambers 17, or at a position near the water collection bucket 2 at a lower side of the intermediate chamber 17 within each of the intermediate chambers 17. Optionally, the outlet direction of these bubble water jets 72 is also oriented or approximately oriented tangentially to cause the ejected fluid to move tangentially.

Referring to fig. 7, in the present embodiment, the swirl pot 3 has a cylindrical structure with a varying width.

The swirl pot 3 comprises a bottom wall 30, a first conical wall 31 and a second conical wall 32.

The first conical wall 31 is in an inverted state, and is narrow at the lower part and wide at the upper part. The edge of the side of the first conical wall 31, which has the smaller inner diameter, is joined to the edge of the bottom wall 30. When the bottom wall 30 is flat and horizontally placed, the included angle λ1 between the first conical wall 31 and the bottom wall 30 is 120-140 degrees. In other embodiments, the taper angle λ2 of the first taper wall 31 may be set to 60 to 100 degrees, and the bottom plate 30 may be set to other shapes, such as a spherical structure.

The first conical wall 31 is narrow at the top and wide at the bottom. The side edge of the second tapered wall 32 having the larger inner diameter is connected to the side edge of the first tapered wall 31 having the larger inner diameter. The angle α1 between the second conical wall 32 and the horizontal plane is 75-85 degrees. In other embodiments, the taper angle α2 of the second taper wall 32 may be set to 10 to 30 degrees.

The width of the bottom wall 30 is D1, the length of the first conical wall 31 is D2, the length of the second conical wall 32 is D3, wherein the lengths of the first conical wall 31 and the second conical wall 32 are based on the length of the vertical section passing through the central axis of the cyclone cylinder 3, and the following relationship is satisfied: d2 = (1-1.2) ×d1, d3= (3-3.4) ×d2.

The cyclone cylinder 3 can guide sewage to swirl upwards, at the moment, the whole movement direction of the sewage and the bubbles is consistent, and the sewage and the bubbles are transported upwards by the swirling flow, so that the bubbles can be prevented from being impacted by downward liquid flow when floating, the utilization efficiency of the bubbles is improved, and the oil removal depth is increased. In addition, by utilizing the tapered configuration of the cyclone cylinder 3, on one hand, the distribution of the cyclone field of the sewage can be controlled, and the attenuation of centrifugal acceleration of the sewage caused by overcoming the action of gravity is delayed; on the other hand, the oil-water separation process can be quickened, and the hydraulic retention time can be shortened.

Referring to FIG. 5, in some embodiments, the thickness H of the coalescing module 8 is 1/5 to 1/6 of the inner diameter D4 of the housing 1.

The oily sewage treatment method of the present embodiment, using the oily sewage treatment device of each of the above embodiments, comprises the steps of:

s10, introducing oily sewage containing dissolved gas into the first-stage separation assembly, tangentially spraying the oily sewage into a cyclone cylinder 3 of the first-stage separation assembly to form a cyclone, separating out a large number of microbubbles from the dissolved gas water, and mutually adhering and floating after oil drops collide with the bubbles under the action of proper turbulence.

S20, the oily sewage overflowed from the cyclone cylinder 3 of the first-stage separation assembly or the upper-stage separation assembly flows into the water collecting bucket 2 of the next-stage separation assembly or the tail-stage separation assembly, and is made into a cyclone from the cyclone cylinder 3 which is tangentially sprayed to the next-stage separation assembly after passing through the water collecting bucket 2.

S30, the oily sewage is discharged after deoiling treatment by a tail separation assembly.

In the steps:

In some embodiments, the step S10 and the step S20 further include a step a: and introducing water carrying micro bubbles or dissolved gas into the lower part of the cavity outside each cyclone cylinder 3 so as to enhance air floatation oil removal.

In some embodiments, in step a: the water carrying the microbubbles or dissolved gas is ejected tangentially to enhance the air bearing degreasing.

In some embodiments, the oily wastewater treatment method further comprises step S31: the oily water is treated by the tail separation assembly for degreasing, then continuously passes through the coalescing module 8, and is discharged after smaller oil drops are further removed.

The examples of the present invention are intended to be illustrative only and not to limit the scope of the claims, and other substantially equivalent substitutions will occur to those skilled in the art and are intended to be within the scope of the present invention.

Claims

1. The utility model provides a vertical multistage cyclone floats oily sewage treatment device, includes the casing, its characterized in that still includes in proper order with locating in series first order separation subassembly, 0 ~ N level intermediate level separation subassembly and tail separation subassembly in the casing, N is natural number, wherein:

the first-stage separation assembly comprises a cyclone cylinder, one or more spray heads for communicating with the sewage pipe are arranged in the cyclone cylinder,

each intermediate stage separation assembly and each tail stage separation assembly comprises a water collecting bucket and a cyclone cylinder, wherein one or more spray heads are arranged in the cyclone cylinder;

a first cavity/middle cavity of the water collecting bucket communicated with the middle stage/tail stage separation assembly of the next stage is formed between the shell and the cyclone cylinder of the first stage/each middle stage separation assembly, and a tail cavity communicated with a water outlet is formed between the shell and the cyclone cylinder of the tail stage separation assembly;

wherein:

2. The oily wastewater treatment device of claim 1, wherein the spray heads in each cyclone cylinder are disposed proximate the bottom of the cyclone cylinder;

the edges of the water collecting hoppers are in sealing connection with the shell.

3. The oily wastewater treatment device of claim 1, wherein a coalescing module is further disposed within the tail chamber, wherein the wastewater treated by the tail separation assembly is discharged to the drain after passing through the coalescing module;

the thickness H of the coalescing module is 1/5-1/6 of the inner diameter D4 of the shell.

4. The oily wastewater treatment device of claim 1, wherein the head chamber is provided with an oil collection cap therein, wherein: the oil collecting cover is arranged on the upper side of the cyclone cylinder in the head cavity at intervals; the oil collecting cover is of an umbrella-shaped structure with the middle part protruding upwards;

the peripheral edge of the oil collecting cover stretches outwards by a certain amplitude relative to the opening at the upper part of the cyclone cylinder in the head cavity.

5. The oily sewage treatment device according to claim 1, wherein the housing is provided with: at least one oil drain and at least one air vent communicated to the head cavity, at least one oil drain and at least one air vent communicated to the intermediate cavity, and at least one oil drain and at least one air vent communicated to the tail cavity.

6. The apparatus according to claim 5, wherein in each of the head chamber/intermediate chamber/tail chamber, an oil drain port and an air discharge port are provided near an upper portion of the head chamber/intermediate chamber/tail chamber;

the oil drain port communicated to the head cavity is at least higher than the edge of the oil collecting cover in height;

in the same head/middle/tail chamber, the oil drain is lower in height than the exhaust port.

7. The oily wastewater treatment device according to claim 5, wherein a part of or all of the exhaust ports of each of the head chamber/middle chamber/tail chamber are communicated with a bubble generator, and the output end of the bubble generator is positioned below the inner flow cylinder in the head chamber or/and the inner flow cylinder in the middle chamber respectively;

a one-way valve allowing the air to flow to the bubble generator is arranged on a pipeline connected with each air outlet of the bubble generator;

and the shell is also provided with at least one air leakage port communicated with the head cavity.

8. The oily wastewater treatment device of claim 7, wherein the bubble generator is in communication with an output of a multiphase flow pump, an input of the multiphase flow pump being in communication with the drain.

9. An oily sewage treatment device according to claim 1, wherein the sewer pipe penetrates from the bottom of the housing; the water collecting hoppers and the cyclone cylinders are respectively provided with a sleeving hole, and are sleeved on the outer side of the sewage pipe by means of the sleeving holes; wherein,,

the hole wall of each sleeve joint hole is fixedly connected with the outer side of the sewage pipe in a sealing way.

10. The apparatus according to claim 1, wherein the inner side wall of the upper part of each cyclone tube is a conical surface, and forms an upward closing structure.

11. The oily wastewater treatment device of claim 1 or 10, wherein the cyclone cartridge comprises:

a bottom wall, a bottom wall and a bottom wall,

an inverted first conical wall, the edge of which on the smaller inner diameter side is connected with the edge of the bottom wall, and,

and the side edge of the second conical wall with the larger inner diameter is connected with the side edge of the first conical wall with the larger inner diameter.

12. The oily sewage treatment device of claim 11, wherein the included angle λ1 between the first conical wall and the horizontal plane is 120-140 degrees, or the conical angle λ2 of the first conical wall is 60-100 degrees;

the included angle alpha 1 between the second conical wall at the upper part of the cyclone cylinder and the horizontal plane is 75-85 degrees, or the cone angle alpha 2 of the second conical wall at the upper part of the cyclone cylinder is 10-30 degrees;

the width of diapire is D1, the length of first awl wall is D2, the length of second awl wall is D3, satisfies following relation: d2 = (1-1.2) ×d1, d3= (3-3.4) ×d2.

13. An oily sewage treatment device according to claim 1, wherein each of the water collection hoppers has a funnel structure comprising an opening portion and a pipe portion, and the cone angle θ of the opening portion of the water collection hopper is 100 to 120 degrees.

14. The oily sewage treatment device according to claim 1, wherein each cyclone cylinder is internally provided with a water distribution pipe communicated with a plurality of spray heads in the cyclone cylinder.

15. The oily sewage treatment apparatus of claim 14, wherein each of the water distribution pipes comprises a sleeve portion at an intermediate position and a plurality of branch pipe portions connected to the outside of the sleeve portion, wherein each branch pipe portion is connected to one of the spray heads;

each water distribution pipe is provided with 2 to 6 branch pipe parts uniformly surrounding the sleeve pipe part of the water distribution pipe.

16. A multi-stage cyclone floating oily sewage treatment method for an oily sewage treatment device according to any one of claims 1 to 15, characterized in that the oily sewage treatment method comprises the steps of:

s20, enabling oily sewage overflowed from a cyclone cylinder of a first-stage separation assembly or a last-stage separation assembly to flow into a water collecting bucket of a next-stage separation assembly, and enabling the oily sewage to tangentially jet into the cyclone cylinder of the next-stage separation assembly after passing through the water collecting bucket to form a cyclone;

17. The oily wastewater treatment apparatus of claim 16, wherein step S10 and step S20 further comprise step a: introducing water carrying micro bubbles dissolved in the water to the lower part of the cavity outside each cyclone cylinder;

in the step A: the water carrying the micro bubbles or dissolved gas is ejected tangentially;

the oily sewage treatment method further comprises the step S31 of: the oily sewage is deoiled by the tail separation assembly, continuously passes through the coalescing module, and is discharged after smaller oil drops are further removed;

the centrifugal acceleration of the fluid sprayed by the spray head in the cyclone cylinder in the first cavity is 10-50 g.