CN112723437A - Device for treating oil refining wastewater based on hydrodynamic cavitation - Google Patents

Device for treating oil refining wastewater based on hydrodynamic cavitation Download PDF

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Publication number
CN112723437A
CN112723437A CN202011448813.9A CN202011448813A CN112723437A CN 112723437 A CN112723437 A CN 112723437A CN 202011448813 A CN202011448813 A CN 202011448813A CN 112723437 A CN112723437 A CN 112723437A
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CN
China
Prior art keywords
rotors
stator
rotating shaft
group
cavitation
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Pending
Application number
CN202011448813.9A
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Chinese (zh)
Inventor
陈颂英
孙逊
刘竞婷
丛山昊
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Shandong University
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Shandong University
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Priority to CN202011448813.9A priority Critical patent/CN112723437A/en
Publication of CN112723437A publication Critical patent/CN112723437A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)

Abstract

A device for treating oil refining wastewater based on hydrodynamic cavitation comprises a stator, a first group of rotors and a second group of rotors, wherein the stator is a sealed cylinder, and a liquid inlet and a liquid outlet are respectively arranged at two sides of the stator; the first group of rotors and the second group of rotors are arranged in the stator and are respectively arranged on a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are respectively arranged on two sides of the stator, and the rotating directions of the first rotating shaft and the second rotating shaft are opposite; the first group of rotors and the second group of rotors comprise inner rotors and outer rotors, the inner rotors in the two groups are opposite, and the outer rotors are provided with probe columns; cavitation holes are formed in the outer peripheral surfaces of the inner rotor, the outer rotor and the probe columns and in the inner wall of the stator. Oil refining wastewater after oil-water separation is conveyed into the stator, and the rotors are driven by respective rotating shafts to rotate, so that cavitation is generated, and degradation of organic matters in the oil refining wastewater is realized. The invention adopts hydrodynamic cavitation to treat the oil refining wastewater, can carry out multiple circulating treatment, has good treatment effect and high treatment efficiency, and does not generate secondary pollution.

Description

Device for treating oil refining wastewater based on hydrodynamic cavitation
Technical Field
The invention relates to a device for treating oil refining wastewater by a hydrodynamic cavitation technology, and belongs to the technical field of oil refining wastewater treatment.
Background
The amount of the waste water generated by the petroleum industry is 0.4-1.6 times of the amount of the raw oil to be treated, and the generation amount of the waste water is large. The major sources of wastewater from the petroleum industry are wastewater from crude oil refining, fuel production, and lubricating oil and petrochemical intermediates. The main components of the sewage comprise polycyclic aromatic hydrocarbon content, grease, nitrogen-sulfur compounds, bacteria and the like.
A typical refinery wastewater treatment plant uses a series of established processes, namely physical, physico-chemical, chemical and biological processes. For example, CN102070226A and CNCN102101704A adopt the physical adsorption principle to treat oil refining wastewater, which can achieve a certain treatment effect, but are greatly affected by the saturation of the adsorbent. The chemical oxidation method needs a large amount of oxidant for treatment, CN104163484A increases the catalytic oxidant CuO/gamma-Al2O3The method for treating sewage can directionally remove pollutants of oil refining wastewater, but also introduces metal elements such as Cu, Al and the like, and has low reaction efficiency. In addition, there are also researches on the application of new technologies, including microporous filter membranes, reverse osmosis filter membranes, microwave assisted wet air oxidation and other methods. However, these methods generally have the limitations of less removal of organic pollutants, low reaction rate, generation of solid sludge, etc., and work in a limited pH range.
The hydrodynamic cavitation technology is a novel environmental pollutant degradation technology, has the characteristics of simple and convenient method, no secondary pollutant generation, wide application range and the like for treating organic pollutants, and has wide development potential and application prospect. Hydroxyl radical OH generated in the cavitation process can effectively degrade organic pollutants in the oil refining wastewater, has the advantages of high chemical stability, no harm to human bodies, lower cost, mild reaction conditions, small selectivity and the like, and is widely applied to the treatment of pollutants difficult to degrade.
CN110304676A provides a mobile sewage treatment plant based on hydrodynamic cavitation technique, but the device structure is more complicated, and is higher to installation precision and outfit the requirement, and equipment manufacturing cost is higher.
Disclosure of Invention
Aiming at the problems of the existing oil refining wastewater degradation technology, the invention provides the device for treating the oil refining wastewater based on the hydrodynamic cavitation, which can effectively degrade the oil refining wastewater.
The device for treating the oil refining wastewater based on the hydrodynamic cavitation adopts the following technical scheme:
the device comprises a stator, a first group of rotors and a second group of rotors, wherein the stator is a sealed cylinder, and a liquid inlet and a liquid outlet are respectively arranged on two sides of the stator; the first group of rotors and the second group of rotors are arranged in the stator and are respectively arranged on a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are respectively arranged on two sides of the stator, and the rotating directions of the first rotating shaft and the second rotating shaft are opposite; the first group of rotors and the second group of rotors comprise inner rotors and outer rotors, the inner rotors in the two groups are opposite, and the outer rotors are provided with probe columns; cavitation holes are arranged on the peripheries (end faces and outer circular faces) of the inner rotor, the outer rotor and the probe columns and on the inner wall of the stator.
The clearance between the outer end face of the cavitation hole and the opposite face of the cavitation hole is 4-8 mm.
The cavitation holes are blind holes, and the ratio of the diameter to the depth is 2: 5. the cavitation holes are blind holes, the depth of the cavitation holes is 50mm, and the diameter of the cavitation holes is 20 mm.
The rotating speed of the first group of rotors and the second group of rotors is 1600-3600 r/min.
Oil refining wastewater after oil-water separation is conveyed into the cavity of the stator through the liquid inlet, and the two groups of rotors are driven by respective rotating shafts to rotate in opposite directions to generate cavitation, so that organic matters in the oil refining wastewater are degraded.
The invention has the following characteristics:
1. the hydrodynamic cavitation is adopted to treat the oil refining wastewater, the device is simple, the oil refining wastewater can be circularly treated for many times, the treatment effect is good, and no secondary pollution is generated.
2. The double rotors are symmetrically distributed, holes are formed in the two sides of a single rotor, holes are formed in the outer edge of the rotor and the inner wall of the stator, and the two rotors rotate in the opposite directions under the driving of the double motors, so that the treatment efficiency of the hydrodynamic cavitation device is greatly improved.
3. The special design of the rotor can ensure the full and uniform liquid reaction and can realize large-scale production.
4. The motor is used as a power source of the oil refining wastewater treatment system, is not influenced by environmental factors, can be opened at any time according to requirements, and has high flexibility.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for treating refinery waste water by hydrodynamic cavitation according to the present invention.
Fig. 2 is a schematic structural diagram of an end face of the outer rotor in the present invention.
FIG. 3 is a flow chart of the hydrodynamic cavitation oil refining wastewater treatment system.
In the figure: 1. the rotor comprises a liquid inlet, 2 parts of a sealing cover, 3 parts of an end cover, 4 parts of an angular contact ball bearing, 5 parts of a first rotating shaft, 6 parts of a mechanical seal, 7 parts of a rotor end surface cavitation hole, 8 parts of a sealing ring, 9 parts of a shell, 10 parts of a first group of rotors, 11 parts of a rotor end surface cavitation hole, 12 parts of a stator cavitation hole, 13 parts of a second group of rotors, 14 parts of a wedge key, 15 parts of a right end cover, 16 parts of a second rotating shaft, 17 parts of an angular contact ball bearing, 18 parts of a shaft sleeve, 19 parts of a liquid outlet, 20 parts of a coupler, 21 parts of a speed increaser, 22 parts of a motor, 23.
Detailed Description
The device for treating oil refining wastewater based on hydrodynamic cavitation of the invention, as shown in figure 1, comprises a stator 9, a first set of rotors 10 and a second set of rotors 13. The stator 9 is a sealed cylinder, two ends of the stator are connected with end covers 15 through bolts, and sealing gaskets 8 are arranged at the joints to form a sealed cavitation cavity. The end cover 15 is connected with a bearing shell 2 through a screw, an angular contact ball bearing 4 is installed in the bearing shell 2, the bearing shell 2 is connected with a sealing cover 3, and a sealing ring is arranged at the joint to realize sealing. A liquid inlet 1 is arranged on the left side (left end cover) of the stator 9, and a liquid outlet 19 is arranged on the right side (left end cover).
A first set of rotors 10 and a second set of rotors 13 are disposed within and spaced apart from the stator 9. The main body structures of the first group of rotors 10 and the second group of rotors 13 are both cylindrical wheel disc structures, the first group of rotors 10 and the second group of rotors 13 are respectively fixedly connected with a first rotating shaft 5 and a second rotating shaft 16 through wedge keys 14, the first rotating shaft 5 is installed in a left end cover of the stator 9 through an angular contact ball bearing 4 and extends out of the left end cover, and the extending end is sequentially connected with a speed increaser 21 and a motor 22 through a coupler 20. The second rotating shaft 17 is installed in the right end cover of the stator 9 through an angular contact ball bearing and extends out of the right end cover, and the extending end is also sequentially connected with the speed increaser and the motor. The two motors respectively drive the first rotating shaft 5 and the second rotating shaft 16 to rotate, and the directions of the first rotating shaft 5 and the second rotating shaft 16 are opposite. The first rotating shaft 5 and the second rotating shaft 16 are provided with sealing devices 6 in the bearing housings 2 at two ends of the stator 9, and mechanical sealing can be adopted to isolate waste water and prevent leakage.
The first set of rotors 10 and the second set of rotors 13 each comprise an inner rotor 24 and an outer rotor 25, with a bushing 18 disposed between the inner rotor 24 and the outer rotor 25, and the inner rotors of the two sets are opposed. The inner rotor 24 has a disk shape. The structure of the outer rotor 25 is shown in fig. 2, and two symmetrically distributed probe columns 23 are arranged on the outer rotor, and the number of the probe columns 23 can be larger.
The end faces of the two sides of the inner rotor 24 and the outer rotor 25 are both provided with rotor end face cavitation holes 7, the outer circular face is provided with rotor outer circular cavitation holes 11, and the distribution of the rotor end face cavitation holes 7 is concentric circle distribution as shown in figure 2. The inner wall surface of the stator 9 is provided with stator cavitation holes 12 to improve the cavitation efficiency. The outer rotor 25 has probe cavitation holes distributed around the probe 23 (end and outer circumferential surfaces) to facilitate the thorough mixing of the wastewater. All cavitation holes are blind holes, the depth is 50mm, the diameter is 20mm, and the ratio of the diameter to the depth is 2: 5. in order to ensure the efficient formation of the cavitation phenomenon, the gaps between the end faces of all the cavitation holes and the opposite faces of the cavitation holes are 4-8 mm. That is, the distance between the outer end face of the rotor outer circular cavitation hole 11 and the inner wall of the stator 9 is 4-8 mm, the gap between the other end face and the end cover of the stator 9 (the gap between the outer rotor 25 and the end cover of the stator 9) is 4-8 mm, the gap between the inner rotor 24 and the outer rotor 25 is set to be 4-8 mm, the distance between the two inner rotors 24 is set to be 4-8 mm, and the rotating speed of the first group of rotors 10 and the second group of rotors 13 is 1600-3600 r/min.
The process of treating the oil refining wastewater by the device is shown in fig. 3, and comprises a tempering tank, a filtering tank, the device and a collecting tank, which are described in detail below.
And (3) conveying the oil refining wastewater into a tempering tank, adding a flocculating agent to perform oil-water separation treatment on the oil refining wastewater, adjusting the pH of the wastewater to be about 7, and then, conveying the wastewater into a filtering tank to perform filtering treatment, thereby further separating the oil from the water in the oil refining wastewater.
Oil refining wastewater after oil-water separation is conveyed to a liquid inlet 1 in the device by a slurry pump to enter a cavity of a stator 9, a first rotating shaft 5 drives a first group of rotors 10 to rotate, a second rotating shaft 16 drives a second group of rotors 13 to rotate, the rotation directions are opposite, cavitation occurs, and the effect of degrading organic matters in the oil refining wastewater is realized. Whether or not to perform the recycling treatment can be considered according to the degradation condition. If the treatment is finished, the finally produced treated water is output from the liquid outlet 19 and is discharged into the collecting tank.
In order to further detect the actual effect of the hydrodynamic cavitation oil refining wastewater treatment device, the oil refining wastewater is treated by using the device, grouping experiments are performed mainly aiming at indexes such as cavitation reaction time, sterilization and oil removal effects and the like, and the wastewater discharged from the liquid outlet 19 is sampled and detected. The microorganisms present in each sample were counted using COD standard method analysis, heterotrophic bacteria plate count (HPC). Experiments prove that the cavitation reactor works continuously for more than 10 minutes, the sterilization effect can reach about 36 percent, the COD is reduced by about 12 percent, the cavitation reactor reacts for more than 15 times, the obtained sterilization effect can reach about 75 percent, the COD is reduced by about 43 percent, and the treatment effect of the oil refining wastewater is obvious.

Claims (5)

1. A device based on hydrodynamic cavitation handles oil refining waste water, characterized by: the rotor comprises a stator, a first group of rotors and a second group of rotors, wherein the stator is a sealed cylinder, and a liquid inlet and a liquid outlet are respectively arranged on two sides of the stator; the first group of rotors and the second group of rotors are arranged in the stator and are respectively arranged on a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are respectively arranged on two sides of the stator, and the rotating directions of the first rotating shaft and the second rotating shaft are opposite; the first group of rotors and the second group of rotors comprise inner rotors and outer rotors, the inner rotors in the two groups are opposite, and the outer rotors are provided with probe columns; cavitation holes are formed in the outer peripheral surfaces of the inner rotor, the outer rotor and the probe columns and in the inner wall of the stator.
2. The device for treating refinery waste water based on hydrodynamic cavitation of claim 1, wherein the gap between the outer end face of the cavitation hole and the opposite face thereof is 4-8 mm.
3. The device for treating refinery waste water based on hydrodynamic cavitation of claim 1, wherein the cavitation holes are blind holes with a depth of 50mm and a diameter of 20 mm.
4. The device for treating refinery waste water based on hydrodynamic cavitation as claimed in claim 1, wherein said cavitation holes are blind holes with a diameter to depth ratio of 2: 5.
5. the device for treating oil refining wastewater based on hydrodynamic cavitation as claimed in claim 1, wherein the rotation speed of the first set of rotors and the second set of rotors is 1600-3600 r/min.
CN202011448813.9A 2020-12-11 2020-12-11 Device for treating oil refining wastewater based on hydrodynamic cavitation Pending CN112723437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011448813.9A CN112723437A (en) 2020-12-11 2020-12-11 Device for treating oil refining wastewater based on hydrodynamic cavitation

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Application Number Priority Date Filing Date Title
CN202011448813.9A CN112723437A (en) 2020-12-11 2020-12-11 Device for treating oil refining wastewater based on hydrodynamic cavitation

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150328603A1 (en) * 2014-05-19 2015-11-19 Highland Fluid Technology, Ltd. Cavitation Pump
CN111807584A (en) * 2020-07-31 2020-10-23 山东大学 Device for degrading antibiotic wastewater by combining hydrodynamic cavitation and photolysis

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150328603A1 (en) * 2014-05-19 2015-11-19 Highland Fluid Technology, Ltd. Cavitation Pump
CN111807584A (en) * 2020-07-31 2020-10-23 山东大学 Device for degrading antibiotic wastewater by combining hydrodynamic cavitation and photolysis

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Application publication date: 20210430

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