CN114455670A - Oil refining sewage heterogeneous medium combined oil removing and suspension removing system and method - Google Patents
Oil refining sewage heterogeneous medium combined oil removing and suspension removing system and method Download PDFInfo
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- CN114455670A CN114455670A CN202210098217.5A CN202210098217A CN114455670A CN 114455670 A CN114455670 A CN 114455670A CN 202210098217 A CN202210098217 A CN 202210098217A CN 114455670 A CN114455670 A CN 114455670A
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- 238000011001 backwashing Methods 0.000 claims description 21
- 230000033001 locomotion Effects 0.000 claims description 16
- 238000004062 sedimentation Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 12
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5209—Regulation methods for flocculation or precipitation
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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
- C02F2001/007—Processes including a sedimentation step
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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
- 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)
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides an oil refining sewage opposite-medium combined oil removing and suspension removing system and method, which comprises a power conveying device, an air dissolving device, a self-adaptive cyclone air flotation separation device and an opposite-medium oil removing device which are sequentially connected, wherein the air dissolving device is used for aerating incoming sewage; the self-adaptive cyclone air-flotation separation device comprises a separation tank body and one or more cyclone core pipes which are arranged in the separation tank body and connected in parallel, wherein the water inlet of each cyclone core pipe is communicated with the water inlet of the separation tank body; the bottom of the rotational flow core pipe is provided with a rotation generator, the rotation generator comprises a hub and a plurality of guide vanes, and the guide vanes are uniformly distributed on the outer surface of the hub; the foreign medium oil removing device comprises one or more foreign fiber particle oil removers connected in series and used for further separating the water phase discharged by the self-adaptive cyclone air flotation separation device. The combined oil removing and suspension removing system has high operation flexibility, and can realize efficient oil removing and suspension removing for oily sewage with various water qualities.
Description
Technical Field
The invention belongs to the fields of petrochemical industry and environmental protection, and particularly relates to an oil refining sewage anisotropic medium combined oil removal suspension removal system and method.
Background
In the fields of petroleum exploitation and petrochemical industry, a large amount of oil refining sewage can be generated in a plurality of operation units, the oil refining sewage generated by different operation units has large difference of physicochemical properties, the oil refining sewage contains impurities such as surfactant, suspended matters and the like, and the demulsification, oil removal and suspension removal are difficult, which is a key point and a difficult point in the treatment of the oil-containing sewage. The prior method for treating the oily sewage mainly comprises demulsification by adding a chemical agent and treatment by matching with traditional equipment such as an inclined plate, air flotation, biochemistry and rotational flow, has the problems of large dosage, large occupied area, high energy consumption and the like, needs to change the type and dosage of the agent according to the treated water quality, and has poor universality. The physical demulsification, oil removal and suspension removal method has the advantages of strong universality, good dirty oil recovery, no secondary pollution and the like, and is increasingly paid attention by researchers. The oil removal and suspension removal of the oil refining sewage by using a physical method has important significance for realizing near zero consumption of chemical agents and improving the treatment of the oil refining sewage in the resource level.
Chinese patent CN201821513224.2 discloses a high-speed oil removing device and a high-speed and high-efficiency oil removing air flotation filter tank, which are sequentially provided with a high-speed oil removing area, a coagulation area, a flocculation area, an air flotation area and a filtration area along the flowing direction of sewage, wherein the high-speed oil removing area comprises the high-speed oil removing device, and the filtration area is connected with a water outlet pipe. The method can efficiently remove oil in the sewage, realize the collection and recycling of partial floating oil, and can separate and filter suspended matters in the sewage. However, the method has large floor area and poor universality due to the addition of chemical agents.
Chinese patent No. cn201410210930.x discloses a method and apparatus for deep oil removal of wastewater containing low-concentration dirty oil, wherein the wastewater containing low-concentration dirty oil enters the apparatus from an inlet, then the fluid is uniformly distributed by a rectifier, then capture, coalescence and growth of trace oil drops and demulsification and separation of trace oil-in-water emulsion are carried out by an oleophilic hydrophobic fiber and hydrophilic oleophobic fiber braided layer which is braided in a certain manner, and finally the rapid coalescence and growth and separation of oil drops are realized by a corrugation strengthened sedimentation separation manner. However, the method is only suitable for the low-concentration oily sewage and has poor treatment effect on the sewage with high oil content.
Chinese patent CN202010973814.9 discloses a device and a method for removing heterogeneous fiber combined deoiling synergetic micro-nano suspended particles, which realize deep removal of micro-nano suspended particles in sewage, but the method mainly aims at suspended particles in sewage and cannot play a good role in oily sewage with high oil content. Therefore, it is still urgently needed to design an oil removing and suspending system which has a wide operation range and can efficiently treat the oil refining wastewater.
Disclosure of Invention
In order to solve the problems, the invention provides an oil refining sewage anisotropic medium combined oil removing and suspension removing system and method, wherein oil removing and suspension removing are carried out through a physical method, methods such as cyclone air flotation, centrifugation, medium coalescence and the like are combined, the occupied area is small, the operation range is wide, oil refining sewage can be processed more economically and efficiently, the self-adaptive capacity is strong, and quick and efficient oil removing and suspension removing can be realized.
In a first aspect, the invention provides an oil refining sewage heterogeneous medium combined oil removing and suspension removing system, which comprises a power conveying device, an air dissolving device, a self-adaptive cyclone air flotation separation device and a heterogeneous medium oil removing device, which are sequentially connected, wherein: the gas dissolving device is used for aerating the incoming sewage; the self-adaptive cyclone air-flotation separation device comprises a separation tank body and one or more cyclone core tubes arranged in the separation tank body in parallel, wherein the water inlets of the cyclone core tubes are communicated with the water inlet of the separation tank body; the bottom of the rotational flow core pipe is provided with a rotation generator, the rotation generator comprises a hub and a plurality of guide vanes, the guide vanes are uniformly distributed on the outer surface of the hub, and a rotational flow field generated by the rotation generator enables liquid entering the rotational flow core pipe to change from axial motion to rotary motion; the foreign medium oil removing device comprises one or more foreign fiber particle oil removers connected in series and used for further separating the water phase discharged by the self-adaptive cyclone air flotation separation device.
The invention is further provided that the guide vane comprises a baffling section at the lower part and a rotation-making section at the upper part, wherein the baffling section is a vertical vane, so that the incoming liquid uniformly enters the rotation-making section; the rotation-making section is a helical blade and is arranged in the middle of the hub, and the rotation-making section changes the axial motion of the incoming liquid into rotary motion; the bottom end of the hub extends out to the lower end of the guide vane.
The invention is further set up in that the air dissolving device is an air dissolving tank and an air dissolving pump which are communicated with each other, the air dissolving tank is an empty tank, the top of the air dissolving tank is provided with a water inlet and an air supply port, the side wall of the air dissolving tank is provided with a circulating water outlet and a water outlet, and the bottom of the air dissolving tank is provided with an air inlet; the dissolved air pump is respectively provided with an air suction port, a circulating water inlet and a dissolved air water outlet; the water inlet of the dissolved air tank is communicated with the power conveying device, the circulating water outlet is communicated with the circulating water inlet, and the dissolved air pump conveys the aerated dissolved air water to the self-adaptive cyclone air flotation separation device through the dissolved air water outlet; the air suction port of the dissolved air pump is communicated with the air inlet pipeline; and a gas supply port of the dissolved gas tank is communicated to a gas suction port of the dissolved gas pump so as to reduce the use of gas.
The invention is further provided that the height of the dissolved air tank is 3.5-3.7 times of the inner diameter of the dissolved air tank.
The invention is further set that the air dissolving device is a Venturi tube bubble generator, the Venturi tube bubble generator is provided with an outlet, an inlet and an air suction port, and the inlet, the air suction port and the outlet of the Venturi tube bubble generator are respectively communicated with the power conveying device, the air inlet pipeline and the self-adaptive cyclone air-flotation separation device.
The invention is further arranged that the separation tank body is a horizontal tank body, a rapid sedimentation module is also arranged in the horizontal tank body, and the rotational flow core pipe and the rapid sedimentation module are sequentially arranged in the horizontal tank body along the water flow direction; the upper portion of the horizontal tank body is provided with an exhaust port and an oil discharge port, the lower portion of the horizontal tank body is provided with a water inlet and a sewage discharge port, a water outlet is arranged at one end far away from the rotational flow core pipe, the water outlet of the horizontal tank body is communicated to the foreign fiber particle oil remover, the sewage discharge port and the exhaust port of the horizontal tank body are arranged between the rotational flow core pipe and the rapid sedimentation module, and the oil discharge port of the horizontal tank body is opposite to the exhaust port which is arranged at the other side of the rapid sedimentation module. The water phase passes through during the module subsides fast, the solid can deposit below, discharges through the drain, and the oil phase come-up can form the light oil layer of certain thickness, discharges to external sump oil tank from the oil drain, and the water phase after the separation is discharged from the delivery port, gets into the deoiling device of foreign matter medium.
The invention is further set that the length of the horizontal tank body is 2.4-2.6 times of the inner diameter of the horizontal tank body, the horizontal length of the rapid sedimentation module is 0.1-0.3 times of the inner diameter of the horizontal tank body, and the vertical width of the rapid sedimentation module is equal to the inner diameter of the horizontal tank body.
The invention is further set that the separation tank body is a vertical tank body, the height of the vertical tank body is 2.8-3.0 times of the inner diameter of the vertical tank body, the top of the vertical tank body is provided with an air supply port and an air exhaust port, the bottom of the vertical tank body is provided with a water outlet, the side wall of the vertical tank body is provided with a water inlet, an oil discharge port and a sewage discharge port, and the oil discharge port is arranged at the upper part of the side wall of the vertical tank body; a distributor is arranged below the rotational flow core pipe, and the sewage discharge outlet is arranged on the side wall of the vertical tank body below the distributor. And the solid separated by the cyclone core pipe is discharged from the sewage discharge outlet under the action of the distributor.
The invention is further provided that the foreign fiber particle degreaser comprises a vertical shell, a cavity filled with filler is arranged in the shell, the filler comprises a foreign combined fiber particle layer and a foreign hydrophilic-hydrophobic water dispersible particle layer, and a corrugated plate is arranged below the cavity; the top of the shell is provided with an inlet communicated with the self-adaptive cyclone air-flotation separation device, the upper part of the side wall is provided with an oil discharge port, and the bottom of the shell is provided with an outlet and a backwashing port.
After the water phase treated by the self-adaptive cyclone air-flotation separation device enters the cavity from the inlet, solid particles and floccules are filtered between beds through the interception of hydrophilic and hydrophobic particles and the action of oil drops, the oil drops are coalesced and grow up, and the water phase flows out of the cavity and enters the corrugated plate. Under the action of the corrugated plate, oil drops after coalescence and growth float upwards through a gap between the cavity and the foreign fiber particle oil remover shell, the dirty oil tank is discharged from the oil phase main outlet, and the treated water phase flows out from the lower outlet and enters the next step until the water phase reaches the standard.
The invention is further provided that the height of the shell is 4.2-4.5 times of the inner diameter of the shell, the inner diameter of the cavity is 0.6-0.7 times of the inner diameter of the shell, and the height of the cavity is 1.5-1.7 times of the inner diameter of the shell; the length of buckled plate does 0.6 ~ 0.7 of casing internal diameter is multiplied, and the width does 0.2 ~ 0.3 of casing internal diameter is multiplied, highly is 0.5 ~ 0.6 of casing internal diameter is multiplied.
On the other hand, the invention provides an oil refining sewage anisotropic medium combined oil removal suspension removal method, and the combined oil removal suspension removal system comprises the following steps:
(1) after the oil refining sewage is energized by the power transmission device, gas is added by the gas dissolving device;
(2) the aerated dissolved gas water enters the self-adaptive cyclone air flotation separation device, and the separated oil phase and the separated gas phase are discharged from an external sump oil tank from an oil phase main outlet together;
(3) the separated water phase enters a foreign medium oil removal device for deep separation, the separated oil phase is discharged from an oil phase main outlet to a dirty oil tank, and the water phase enters the next step.
The invention has the following beneficial effects:
(1) the combined oil removing and suspension removing system adopts a mode of connecting the dissolved air device, the self-adaptive cyclone air flotation separation device and the opposite-shaped medium particle oil removing device in series, has higher operation elasticity, and can realize better oil removing and suspension removing effects on oily sewage with different water qualities.
(2) The combined oil removal suspension system provided by the invention does not need to add chemical agents in the sewage treatment process, is low in energy consumption and short in retention time in the treatment process, and realizes more economical and efficient treatment of oil refining sewage.
(3) Compared with the conventional common oily and solid-containing sewage treatment system, the combined oil removing and suspension removing system has smaller floor area and can reduce the space required by the oily sewage treatment process.
Drawings
FIG. 1 is a schematic flow diagram of an oil refining wastewater anisotropic medium combined oil removal and suspension removal system.
Fig. 2 is a schematic structural diagram of a vertical self-adaptive cyclone air flotation high-efficiency separation device.
Fig. 3 is a diagram of the device of the rotation-making device.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a schematic structural view of the dissolved air tank.
FIG. 6 is a flow chart of an oil refining wastewater anisotropic medium combined oil removal suspension system.
FIG. 7 is a schematic structural diagram of a horizontal self-adaptive cyclone air-flotation high-efficiency separation device.
Fig. 8 is a front view of the swirl tube core.
Fig. 9 is a top view of fig. 8.
FIG. 10 is a diagram of an apparatus for removing foreign fiber particles.
FIG. 11 is a backwash flow diagram of a combined process of example 1.
Wherein: 1. a power conveying device, 2, a dissolved air device, 3, a self-adaptive cyclone air flotation separation device, 4 and an opposite-nature medium oil removal device;
2-1: dissolved air tank, 2-1-1: water inlet, 2-1-2: a gas-dissolved water inlet, 2-1-3: a circulating water outlet, 2-1-4: water outlet, 2-1-5: an air supply port; 2-2: dissolved air pump, 2-2-1: a dissolved gas water outlet, 2-2-2: suction port, 2-2-3: a circulating water inlet; 2-3: venturi tube bubble generator, 2-3-1: outlet of venturi tube, 2-3-2: inlet of venturi tube, 2-3-3: the air suction port of the Venturi tube;
3-1: a separation tank body, 3-2: 3-2-1: main separation pipe, 3-2-2: auxiliary separation tube, 3-2-3: a main and auxiliary pipe communicating pipe; 3-3: a rotation-making device, 3-3-1: hub, 3-3-2: rotation making section, 3-3-3: deflection section, 3-4: fast settling module, 3-5: a distributor;
when the separating tank body 3-1 is horizontal: 3-1-1: vent, 3-1-2: oil drain port, 3-1-3: water inlet, 3-1-4: a sewage draining outlet, 3-1-5: a water outlet;
when the separation tank body 3-1 is vertical: 3-1-6: air supply port, 3-1-7: vent, 3-1-8: water inlet, 3-1-9: oil drain port, 3-1-10: drain, 3-1-11: a water outlet;
4-1: shell, 4-1-1: inlet, 4-1-2: oil drain port, 4-1-3: water outlet, 4-1-4: backwash opening, 4-2: cavity, 4-3: a corrugated plate.
Detailed Description
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the invention by those skilled in the art based on the teachings herein are within the scope of the present invention.
As shown in fig. 1 to 4, the oil refining wastewater anisotropic medium combined oil removing and suspension removing system of the present invention comprises a power transmission device 1, an air dissolving device 2, a self-adaptive cyclone air flotation separation device 3, and an anisotropic medium oil removing device 4, which are connected in sequence, wherein:
the self-adaptive cyclone air-flotation separation device 3 comprises a separation tank body 3-1 and one or more cyclone core pipes 3-2 which are arranged in parallel and are arranged in the separation tank body 3-1, a water inlet 3-1-8 is arranged on the separation tank body 3-1, the water inlet of the rotational flow core pipe 3-2 is communicated with the water inlet 3-1-8 of the separation tank body 3-1, the bottom of the rotational flow core pipe 3-2 is provided with a rotation generator 3-3, the rotation generator 3-3 comprises a hub 3-3-1 and a plurality of guide vanes, the guide vanes are uniformly distributed on the outer surface of the hub 3-3-1, and the rotational flow field generated by the rotation generator 3-3 changes the axial movement of the liquid entering the rotational flow core pipe 3-2 into the rotational movement; the foreign medium oil removing device 4 comprises one or more foreign fiber particle oil removers connected in series and is used for further separating the water phase discharged by the self-adaptive cyclone air flotation separation device. In this embodiment, the power transmission device 1 is a centrifugal pump.
Further, the guide vane comprises a baffling section 3-3-3 at the lower part and a rotation making section 3-3-2 at the upper part, the rotation making section 3-3-2 of the guide vane is a spiral vane and is arranged in the middle of the hub 3-3-1, and the rotation making section 3-3-2 changes the axial movement of the incoming liquid into the rotary movement; the baffling section 3-3-3 is a vertical blade, so that the incoming liquid uniformly enters the vortex making section 3-3-2; the bottom end of the hub 3-3-1 extends to the lower end of the guide vane so that the oil core appears at the top end of the hub, the oil core is more concentrated, and the separation effect is improved. In this embodiment, the number of the guide vanes is 5, the guide vanes are uniformly arranged on the hub 3-3-1, and the number of the turns of the vanes of the rotary segment 3-3-2 is 0.5.
In one embodiment, as shown in fig. 1 and 5, the gas dissolving device 2 is a gas dissolving tank 2-1 and a gas dissolving pump 2-2 which are communicated with each other, the gas dissolving tank 2-1 is an empty tank, the top of the gas dissolving tank is provided with a water inlet 2-1-1, the side wall of the gas dissolving tank is provided with a gas dissolving water inlet 2-1-2, a circulating water outlet 2-1-3 and a water outlet 2-1-4; the air dissolving pump 2-2 is respectively provided with an air suction port 2-2-2, a circulating water inlet 2-2-3 and an air dissolving water outlet 2-2-1; the water inlet 2-1-1 of the dissolved air tank 2-1 is communicated with the power conveying device 1, the circulating water outlet 2-1-3 is communicated with the circulating water inlet 2-2-3, the dissolved air pump 2-2 conveys the aerated dissolved air water to the self-adaptive cyclone air flotation separation device 3 through the dissolved air water outlet 2-2-1, the air suction port 2-2-2 of the dissolved air pump 2-2 is communicated with an air inlet pipeline, and the air inlet pipeline is a nitrogen pipeline in the embodiment. Sewage in a sewage pipeline is conveyed into a dissolved air tank 2-1 by the power of a centrifugal pump, enters a dissolved air pump 2-2 through a circulating water inlet 2-2-3 for air dissolution through a circulating water outlet 2-1-3, and then enters a self-adaptive cyclone air flotation separation device 3 through a dissolved air water outlet 2-2-1.
Furthermore, the top of the dissolved air tank 2-1 is also provided with an air supply port 2-1-5, and the air supply port 2-1-5 is communicated with an air suction port 2-2-2 of the dissolved air pump 2-2, so that air can be recycled in the treatment process, and the use of the air is reduced.
In one embodiment, as shown in fig. 6, the air dissolving device 2 is a venturi tube bubble generator 2-3, an outlet 2-3-1 and an inlet 2-3-2 are respectively formed at the top and the bottom of the venturi tube bubble generator 2-3, and the inlet 2-3-2 is communicated with a centrifugal pump; the Venturi tube bubble generator 2-3 is also provided with an air suction port 2-3-3, and the air suction port 2-3-3 is communicated with an air inlet pipeline. Gas and sewage are mixed in the Venturi tube bubble generator 2-3 and then discharged through the outlet 2-3-1, and then enter the self-adaptive cyclone air-flotation separation device 3 for treatment.
In one embodiment, as shown in fig. 7, the separation tank body 3-1 of the adaptive cyclone flotation separation device 3 is a horizontal tank body, a fast settling module 3-4 is further disposed in the horizontal tank body, and the cyclone core tube 3-2 and the fast settling module 3-4 are sequentially disposed in the horizontal tank body along the water flow direction. The upper part of the horizontal tank body is provided with an air exhaust port 3-1-1 and an oil exhaust port 3-1-2, the lower part of the horizontal tank body is provided with a water inlet 3-1-3 and a sewage discharge port 3-1-4, one end far away from the cyclone core tube 3-2 is provided with a water outlet 3-1-5, the water inlet 3-1-3 is communicated with an inlet of the cyclone core tube 2-1, the sewage discharge port 3-1-4 and the air exhaust port 3-1-1 are arranged between the cyclone core tube 3-2 and the rapid sedimentation module 3-4, and the oil exhaust port 3-1-2 is arranged at the other side of the rapid sedimentation module 3-4 relative to the air exhaust port 3-1-1. The length of the horizontal tank body is 2.4-2.6 times of the inner diameter of the horizontal tank body, the horizontal length of the rapid sedimentation module 3-4 is 0.1-0.3 times of the inner diameter of the horizontal tank body, and the vertical width of the rapid sedimentation module 3-4 is consistent with the inner diameter of the horizontal tank body. In this embodiment, the fast settling modules 3 to 4 are corrugated plates.
In one embodiment, as shown in fig. 2, the separation tank body 3-1 of the adaptive cyclone air-flotation separation device 3 is a vertical tank body, the top of the vertical tank body is provided with an air supply port 3-1-6 and an air exhaust port 3-1-7, the side wall of the vertical tank body is provided with a water inlet 3-1-8, an oil discharge port 3-1-9 and a sewage discharge port 3-1-10, the bottom of the vertical tank body is provided with a water outlet 3-1-11, the oil discharge port 3-1-9 is arranged at the upper part of the vertical tank body, and the water inlet of the cyclone core pipe 3-2 is communicated with the water inlet 3-1-8 of the vertical tank body; a distributor 3-5 is arranged below the cyclone core pipe 3-2, the sewage discharge outlet 3-1-10 is arranged on the side wall of the vertical tank body below the distributor 3-5, the gas and a part of suspended matters separated by the cyclone core pipe 3-2 are discharged from an air exhaust outlet 3-1-7, the separated oil phase is discharged from an oil discharge outlet 3-1-9, the solid separated by the cyclone core pipe 3-3 is discharged from the sewage discharge outlet 3-1-10 under the action of the distributor 3-5, and the water phase is discharged from a water outlet 3-1-11 and enters an oil remover for foreign fiber particles.
In this embodiment, the swirl core tube 3-2 may adopt a relevant structure in a self-adaptive multiphase integrated separation device and method of chinese patent CN 202011283927.2. As shown in fig. 8 and 9, the spiral-flow core tube 3-2 includes a main separation tube 3-2-1, three auxiliary separation tubes 3-2-2, and a main and auxiliary tube communicating tube 3-2-3 communicating the main separation tube 3-2-1 and the auxiliary separation tube 3-2-2, the length of the main separation tube 3-2-1 is 1 to 10 times of the inner diameter thereof, the length of the auxiliary separation tube 3-2-2 is 1 to 10 times of the inner diameter thereof, the cross section of the main and auxiliary tube communicating tube 3-2-3 is circular, and 4 tubes are longitudinally distributed. The cyclone field generated by the cyclone 3-3 changes the liquid flowing through the main separation pipe 3-2-1 from axial motion to rotary motion; the auxiliary separation pipe 3-2-2 is provided with an auxiliary separation pipe tangential rotation port along the axial direction, one end of the main and auxiliary pipe communication pipe 3-2-3 is communicated with the auxiliary separation pipe tangential rotation port, the auxiliary separation pipe tangential rotation port enables liquid flowing through the auxiliary separation pipe 3-2-2 to enter the auxiliary separation pipe 3-2-2 through the tangential direction to do rotation movement, and the rotation direction of a flow field of the auxiliary separation pipe 3-2-2 is the same as or opposite to that of the flow field of the main separation pipe 3-2-1. The aerated gas-dissolved water forms rotational flow motion under the action of a cyclone generator 3-3, oil drops and micro bubbles collide and adhere in a cyclone cavity to form flocs, and the flocs rapidly move to a negative pressure field at the center of the cavity under the action of the cyclone and are discharged and separated from the upper part of a main separation pipe 3-2-1; and the unseparated oil drops with small grain size and bubbles enter the auxiliary separation cavity 3-2-2 with smaller rotating radius to realize rapid deep separation under the action of larger centrifugal force.
Further, as shown in fig. 10, each anisotropic fiber particle degreaser includes a vertical housing 4-1, a cavity 4-2 filled with a filler is provided in the housing 4-1, the filler includes an anisotropic combined fiber particle layer and an anisotropic hydrophilic-hydrophobic water dispersion particle layer, and a corrugated plate 4-3 is provided below the cavity 4-2; the top of the shell 4-1 is provided with an inlet 4-1-1, the inlet 4-1-1 is communicated with a water outlet of the self-adaptive cyclone air-flotation separation device 3, the upper part of the side wall of the shell 4-1 is provided with an oil discharge port 4-1-2, the bottom of the shell 4-1 is provided with a water outlet 4-1-3 and a backwashing port 4-1-4, and the backwashing port 4-1-4 is used for backwashing the foreign fiber particle oil remover when not in use. The water phase discharged by the self-adaptive cyclone air-flotation separation device 3 enters from an inlet 4-1-1, enters a cavity 4-2, and then is subjected to hydrophilic and hydrophobic particle interception and oil drop action, so that solid particles and floccules are filtered between bed layers, oil drops are coalesced and grow up, and flow out of the cavity 4-2 and then enter a corrugated plate 4-3; under the action of the corrugated plate 4-3, oil drops after coalescence and growth float upwards through a gap between the cavity 4-2 and the shell 4-1 and are discharged from the oil discharge port 4-1-2, and a water phase after clean treatment flows out from the water outlet 4-1-3 at the lower part and enters the next process.
It should be noted that the self-adaptive cyclone air-flotation separation device 3 of the oil removal suspension system does not need backwashing, when the foreign fiber particle oil remover needs backwashing, gas and water are adopted for mixed backwashing, the gas and the water enter the foreign fiber particle oil remover from the lower backwashing port 4-1-4 for backwashing, and then are discharged from the water inlet 4-1-1 of the foreign fiber particle oil remover, and the backwashing time length and the backwashing period are determined according to actual conditions on site.
The invention also provides an oil refining sewage anisotropic medium combined oil removing and suspension removing method, and the oil removing and suspension removing system comprises the following steps:
(1) the oil refining sewage is firstly energized through a power transmission device 1 and then aerated through a gas dissolving device 2;
(2) the aerated dissolved gas water enters the self-adaptive cyclone air flotation separation device 3, and the separated oil phase and the separated gas phase are discharged from an external sump oil tank from an oil phase main outlet;
(3) and (3) enabling the water phase separated in the step (2) to enter the foreign medium oil removal device 4 for deep separation, discharging the separated oil phase from an oil discharge port to an external sump oil tank, and enabling the water phase to enter the next step.
Example 1
An electro-desalinated wastewater from a certain company contains a large amount of emulsified oil and fine solid particles. The oil content in the sewage is high and fluctuates greatly, the fluctuation is often up to more than 2000mg/L, the contained oil is mainly petroleum, alkane, cyclane and aromatic hydrocarbon together account for 97 percent of the total amount, the COD content fluctuation is large, the duration is often up to more than 5000mg/L, and the oil content of the electric desalting oily sewage is expected to be treated to be lower than 300 mg/L. The combined oil removal suspension system is adopted to treat the sewage of the company.
The process flow of the pilot electric desalting sewage treatment is shown in figure 1: two-stage treatment is adopted, wherein the first stage is a vertical self-adaptive cyclone air flotation separation device 3, the height of a vertical separation tank body is 126.4cm, the inner diameter is 42.6cm, the second stage is a foreign fiber particle oil removal device 4, and two foreign fiber particle oil removers adopt a one-on-one-standby mode; the height of the foreign fiber particle degreaser shell is 255cm, the inner diameter of the shell is 60cm, the inner diameter of the cavity is 40cm, the thickness of the filler in the cavity is 100cm, the length of the corrugated plate is 40cm, the width of the corrugated plate is 15cm, and the height of the corrugated plate is 30 cm. The air dissolving device is an air dissolving tank 2-1 and an air dissolving pump 2-2 which are communicated with each other, and the inner diameter of the air dissolving tank 2-1 is 27cm, and the height of the air dissolving tank is 98 cm. The electric desalting sewage is connected from a water cutting port of the electric desalting tank, and the flow of the sewage entering the experimental device is adjusted to be 4m by an inlet valve and a water outlet valve3/h。
The electro-desalting sewage enters a dissolved air tank 2-1 for dissolved air after being energized by a centrifugal pump, is injected by a dissolved air pump 2-2 for gas-liquid mixing, is discharged through a dissolved air water outlet 2-2-1, and enters a first-stage vertical self-adaptive cyclone air-flotation separation device 3 for treatment through a water inlet 3-1-8 of a vertical tank body. The oil phase and the gas phase of the electric desalting sewage treated by the vertical self-adaptive cyclone air-flotation separation device 3 are discharged through an oil discharge port 3-1-9 and an air exhaust port 3-1-7 respectively, and are discharged to an external sump oil tank from an oil phase main outlet together, and the water phase enters a secondary foreign fiber particle oil remover through a water outlet 3-1-11 and an inlet 4-1-1 for advanced treatment. The oil phase separated by the secondary foreign fiber particle oil remover is discharged from an oil discharge port 4-1-2 and a sewage oil tank through an oil phase main outlet, and the water phase is discharged to a downstream sewage treatment plant for further treatment through a water outlet 4-1-3. Wherein, the gas injection is nitrogen, the air dissolving pump uses water as process circulation purified water, and the nitrogen enters the air dissolving pump 2-2 from the nitrogen pipeline through the air suction port 2-2-2.
At a throughput of 4m3When the oil content of the sewage is changed, the oil content of the sewage at the first outlet is compared with that of the sewage at the second outlet, the oil content of the sewage at the first outlet is 164.19mg/L, the separation efficiency is 91.6 percent by taking the oil content at the inlet as a reference, and the oil content at the second outlet is comparedThe oil content in the buccal cavity is 31.36mg/L, the separation efficiency is 81.1 percent by taking the oil content at the first level outlet as a reference, and the separation efficiency is 98.4 percent by taking the oil content at the inlet as a reference. Compared with the COD change of the sewage at the first-stage outlet and the sewage at the second-stage outlet, the COD value of the sewage at the first-stage outlet is 3450.34mg/L, the COD value at the second-stage outlet is 650.06mg/L, and the total treatment efficiency is 94.47 percent. Meanwhile, the removal effect of the second-stage foreign fiber particle coalescence degreaser on solid suspended matters in the electric desalted sewage at the outlet of the first-stage device is compared, the SS content of the second-stage outlet is 13.08mg/L, and the removal efficiency of the corresponding first-stage outlet is 95.81%.
The process flow of the pilot scale electro-desalting sewage treatment backwashing process is shown in fig. 11, and under the normal operation condition, the first-stage self-adaptive cyclone air-flotation separation device does not need backwashing, and the second-stage foreign fiber particle degreaser is backwashed. During backwashing, gas and water are mixed for backwashing. Nitrogen enters a backwashing port at the bottom of the foreign fiber particle degreaser from a nitrogen pipeline, and tap water enters a backwashing port 4-1-4 of a randomly used foreign fiber particle degreaser shell 4-1 from a purified water pipeline after being energized by a centrifugal pump 1 and flows out from an inlet 4-1-1 at the top. The backwashing time is 20min, the backwashing period is 3 days, and the dosage of backwashing water is about 5-10m3。
At a flow rate of 4m3When the sewage treatment system is used for treating the sewage, the first-stage vertical self-adaptive cyclone air-flotation separation device 3 and the second-stage foreign fiber particle oil removal device 4 are connected in series, the floating oil and the floating slag in the inlet electric desalted sewage can be removed, the oil content of the treated sewage can be as low as 31.36mg/L, the COD value is reduced to 650.06mg/L, and the SS content is reduced to 13.08mg/L, so that the expected target is achieved.
Example 2
The invention relates to a method and a device for removing oil and suspending by combining an oil refining sewage and a heterogeneous medium. The oil-contaminated water of this company contains a small amount of emulsified oil and fine solid particles. The oil content in the sewage is low and the fluctuation is small, the oil content is maintained at about 100mg/L for a long time, the suspended matter content is maintained at about 120mg/L for a long time, and the expected aim is to treat the oil content of the sewage to be lower than 50 mg/L. The combined oil removal suspension system is adopted to treat the sewage of the company.
The device is different from the device in the embodiment 1 in that the first stage is a horizontal self-adaptive cyclone air-flotation separation device, the length of a horizontal separation tank body is 175cm, the inner diameter is 70cm, and the horizontal width of the rapid settling module is 20 cm; the second level is a foreign medium oil removing device consisting of two foreign fiber particle oil removers connected in series, wherein the filler thickness of the foreign fiber particle oil remover is 80cm, and the gas dissolving device 2 is a venturi tube bubble generator.
The oil refining sewage is discharged from the outlet of the sewage tank, and the flow of the sewage entering the experimental device is regulated to be 1m through the inlet valve and the water outlet valve3H is used as the reference value. The oil refining sewage is energized by a centrifugal pump 1, aerated by a Venturi tube bubble generator 2-3 and then enters a first-stage horizontal self-adaptive cyclone air-flotation separation device 3 for treatment. And discharging the oil phase of the oil refining sewage treated by the horizontal self-adaptive cyclone air-flotation separation device from the oil phase main outlet to a sewage tank, and allowing the water phase to enter a secondary foreign fiber particle coalescence oil removal device for advanced treatment. And discharging the oil phase subjected to secondary separation from an oil phase main outlet to a sewage tank, and feeding the water phase into a downstream sewage treatment plant for further treatment.
At a throughput of 1m3When the oil content of the sewage is changed per hour, the oil content of the sewage at the primary outlet is compared with that of the sewage at the secondary outlet, the oil content of the sewage at the primary outlet is 48.71mg/L, and the separation efficiency is 51.3 percent by taking the oil content at the inlet as a reference. The oil content of the secondary outlet is 13.36mg/L, and the separation efficiency is 72.6 percent by taking the oil content of the primary outlet as a reference; the separation efficiency was 86.6% with the oil content at the inlet as reference. Compared with the effect of the second-stage foreign fiber particle coalescence degreaser on removing solid suspended matters in the oil refining sewage at the outlet of the first-stage equipment, the SS content of the second-stage outlet is 11.03mg/L, and the removal efficiency of the corresponding first-stage outlet is 75.61%.
At a flow rate of 1m3And h, under the condition that the first-stage bedroom self-adaptive cyclone air flotation high-efficiency separation device and the second-stage foreign fiber particle oil removal device are connected in series, floating oil and scum in the imported sewage can be removed, the oil content of the treated sewage can be reduced to 13.36mg/L, and the SS content is reduced to 9.03mg/L, so that the expected target is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. The utility model provides an oil refining sewage opposite sex medium combination deoiling removes suspension system which characterized in that, includes the power transmission device who connects gradually, dissolves gas device, self-adaptation whirl air supporting separator and opposite sex medium deoiling device, wherein:
the gas dissolving device is used for aerating the incoming sewage; the self-adaptive cyclone air-flotation separation device comprises a separation tank body and one or more cyclone core pipes which are arranged in the separation tank body in parallel, wherein the water inlet of each cyclone core pipe is communicated with the water inlet of the separation tank body; the bottom of the rotational flow core pipe is provided with a rotation generator, the rotation generator comprises a hub and a plurality of guide vanes, the guide vanes are uniformly distributed on the outer surface of the hub, and a rotational flow field generated by the rotation generator enables liquid entering the rotational flow core pipe to change from axial motion to rotary motion; the foreign medium oil removing device comprises one or more foreign fiber particle oil removers connected in series.
2. The oil refining sewage anisotropic medium combination oil removal and suspension removal system of claim 1, wherein the guide vanes comprise a lower deflection section and an upper rotation-making section, the deflection section is a vertical vane, so that the incoming liquid uniformly enters the rotation-making section; the rotation-making section is a helical blade and is arranged in the middle of the hub, and the rotation-making section changes the axial motion of the incoming liquid into rotary motion; the bottom end of the hub extends out to the lower end of the guide vane.
3. The oil refining sewage anisotropic medium combination oil removing and suspension removing system of claim 1, wherein the air dissolving device is an air dissolving tank and an air dissolving pump which are communicated with each other, the air dissolving tank is an empty tank, the top of the air dissolving tank is provided with a water inlet and an air supply port, the side wall of the air dissolving tank is provided with a circulating water outlet and a water outlet, the bottom of the air dissolving tank is provided with an air inlet, and the air dissolving pump is respectively provided with an air suction port, a circulating water inlet and an air dissolving water outlet; the water inlet of the dissolved air tank is communicated with the power conveying device, the circulating water outlet is communicated with the circulating water inlet, and the dissolved air pump conveys the aerated dissolved air water to the self-adaptive cyclone air flotation separation device through the dissolved air water outlet; the air suction port of the dissolved air pump is communicated with the air inlet pipeline; and a gas supply port of the dissolved gas tank is communicated to a gas suction port of the dissolved gas pump so as to reduce the use of gas.
4. The oil refining sewage anisotropic medium combination oil removal and suspension system according to claim 1, wherein the air dissolving device is a venturi tube bubble generator, the venturi tube bubble generator is provided with an outlet, an inlet and an air suction port, and the inlet, the air suction port and the outlet of the venturi tube bubble generator are respectively communicated with the power transmission device, the air inlet pipeline and the adaptive cyclone air flotation separation device.
5. The oil refining sewage anisotropic medium combined oil removal and suspension removal system of claim 1, wherein the separation tank body is a horizontal tank body, a rapid sedimentation module is further arranged in the horizontal tank body, and the swirl core pipe and the rapid sedimentation module are sequentially arranged in the horizontal tank body along a water flow direction; the upper portion of the horizontal tank body is provided with an exhaust port and an oil discharge port, the lower portion of the horizontal tank body is provided with a water inlet and a sewage discharge port, a water outlet is arranged at one end far away from the rotational flow core pipe, the water outlet of the horizontal tank body is communicated to the foreign fiber particle oil remover, the sewage discharge port and the exhaust port of the horizontal tank body are arranged between the rotational flow core pipe and the rapid sedimentation module, and the oil discharge port of the horizontal tank body is opposite to the exhaust port which is arranged at the other side of the rapid sedimentation module.
6. The oil refining sewage anisotropic medium combined oil removing and suspension removing system as claimed in claim 5, wherein the length of the horizontal tank body is 2.4-2.6 times of the inner diameter of the horizontal tank body, and the horizontal length of the rapid settling module is 0.1-0.3 times of the inner diameter of the horizontal tank body.
7. The oil refining sewage anisotropic medium combined oil removing and suspension removing system as claimed in claim 1, wherein the separation tank is a vertical tank, the top of the vertical tank is provided with an air supply port and an air exhaust port, the bottom of the vertical tank is provided with a water outlet, the side wall of the vertical tank is provided with a water inlet, an oil discharge port and a sewage discharge port, and the oil discharge port is arranged at the upper part of the side wall of the vertical tank; a distributor is arranged below the cyclone core pipe, and a sewage discharge outlet of the vertical tank body is arranged on the side wall of the vertical tank body below the distributor.
8. The oil refining sewage anisotropic medium combination oil removing suspension system according to claim 1, wherein the anisotropic fiber particle oil remover comprises a vertical shell, a cavity filled with a filler is arranged in the shell, the filler comprises an anisotropic combination fiber particle layer and an anisotropic hydrophilic and hydrophobic water dispersion particle layer, and a corrugated plate is arranged below the cavity; the top of the shell is provided with an inlet communicated with the self-adaptive cyclone air-flotation separation device, the upper part of the side wall is provided with an oil discharge port, and the bottom of the shell is provided with an outlet and a backwashing port.
9. The oil refining sewage anisotropic medium combination oil removing and suspension removing system of claim 8, wherein the height of the shell is 4.2 to 4.5 times of the inner diameter of the shell, the inner diameter of the cavity is 0.6 to 0.7 times of the inner diameter of the shell, and the height is 1.5 to 1.7 times of the inner diameter of the shell; the length of buckled plate is 0.6 ~ 0.7 times of casing internal diameter, and the width is 0.2 ~ 0.3 times of its internal diameter, and the height is 0.5 ~ 0.6 times of its internal diameter.
10. An oil refining sewage anisotropic medium combined oil removing and suspension removing method is characterized in that the combined oil removing and suspension removing system of any one of claims 1 to 9 is adopted, and the method comprises the following steps:
(1) after the oil refining sewage is energized by the power transmission device, gas is added by the gas dissolving device;
(2) conveying the aerated dissolved gas water to the self-adaptive cyclone air flotation separation device, and discharging the separated oil phase and gas phase together from an oil phase main outlet to an external sump oil tank;
(3) the separated water phase enters the oil removing device for deep separation, the separated oil phase is discharged from an oil phase main outlet to an external sump oil tank, and the water phase enters the next step.
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