CN116495829A - Multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage - Google Patents
Multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage Download PDFInfo
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- CN116495829A CN116495829A CN202310282526.2A CN202310282526A CN116495829A CN 116495829 A CN116495829 A CN 116495829A CN 202310282526 A CN202310282526 A CN 202310282526A CN 116495829 A CN116495829 A CN 116495829A
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- 239000010865 sewage Substances 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 135
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000004062 sedimentation Methods 0.000 claims abstract description 25
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims abstract description 4
- 239000012071 phase Substances 0.000 claims description 149
- 238000005188 flotation Methods 0.000 claims description 29
- 238000003860 storage Methods 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 7
- 239000008346 aqueous phase Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 239000007791 liquid phase Substances 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 abstract description 14
- 238000005191 phase separation Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000016507 interphase Effects 0.000 abstract description 6
- 235000019198 oils Nutrition 0.000 description 55
- 239000007789 gas Substances 0.000 description 39
- 238000007667 floating Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007790 solid phase Substances 0.000 description 4
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 238000000053 physical method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011197 physicochemical method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Abstract
The invention discloses a multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage, which comprises a cyclone centrifugal separator, a cyclone air floatation tank, an electromagnetic valve, a dosing system, a flow measurement and control system and a liquid level regulation and control system, wherein the cyclone centrifugal separator is formed by non-concentric inclined installation of the multi-layer sleeve. The invention combines the centrifugal separation technology, so that the inter-phase separation speed of the oil-water mixed liquid is improved by tens or even hundreds of times compared with the gravity sedimentation separation speed, thereby reducing the volume of the separator by tens of times compared with the volume of the gravity sedimentation separation, and fully reflecting the advantages of small size, small occupied area and light weight; the multi-layer sleeve is arranged and is arranged in a non-concentric inclined manner, so that the separated oil-water-rich phase oil-water is subjected to gravity sedimentation, and the inter-phase separation efficiency of the oil-water two phases can be further accelerated.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage.
Background
The existing treatment methods of the oily sewage mainly comprise a physical method, a chemical method, a physicochemical method, a biological method and the like.
The physical method is not secondary pollution, has low cost, is simple and reliable, and is paid attention to, and chemical, physicochemical and biological methods are not considered unless colloidal substances, soluble substances or other harmful substances requiring biodegradation are contained in sewage.
Among the physical methods, the use of gravity sedimentation, centrifugal cyclone, high-pressure filtration, micro-bubble floating and other methods is most common, and particularly, the centrifugal cyclone is favored because of the small processing device and the good processing effect of micro-bubble floating.
Centrifugal cyclone separation, which is currently used in industry, is represented by a cyclone separator having a cone-shaped cylinder. The cyclone separator has a very strong shearing action on the fluid flow, so that the cyclone separator is very energy-consuming, drops (oil drops or water drops) are easily broken and emulsified to deteriorate the separation process, and the cyclone separator has poor universality. The cylindrical cyclones used in patent numbers US9901936B2, ZL201810014022.1 and ZL201110220538X have the advantages of low energy consumption and high adaptability, but the purpose of fine separation is difficult to achieve due to the too short residence time (in the order of seconds) of the fluid in the separator. The common microbubble floating technology comprises an air distribution floating technology, an air dissolution floating technology and an electrolysis floating technology, wherein a proper amount of air (nitrogen and the like) is introduced into oily sewage to form a plurality of microbubbles, a three-phase heterogeneous system of water, air and oil drops is formed under the action of the bubbles, and an air-oil drop combination body is formed to float upwards under the action of interfacial tension, air bubble floating force and hydrostatic pressure difference to realize oil-water separation.
Therefore, we propose a multi-layer sleeve cyclone-air floatation device with small occupied area and high treatment efficiency for finely separating low-oil-content sewage to solve the problems.
Disclosure of Invention
The invention aims to provide a multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage, which solves the technical problem that oil-content sewage fine separation equipment occupies a large volume in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
in a first aspect of the present invention, there is provided a multi-layered sleeve cyclone-flotation device for fine separation of low-oil-content sewage, comprising:
the cyclone centrifugal separator is formed by non-concentric inclined installation of a plurality of layers of sleeves, and the sleeves are respectively provided with a cyclone pipe, a water-phase-enriched flow pipe, an oil-water two-phase dynamic sedimentation pipe and a water storage pipe from inside to outside;
the side wall of the cyclone air floatation tank is respectively provided with an oil-rich phase inlet and a water-rich phase inlet from top to bottom, the oil-rich phase inlet and the water-rich phase inlet are tangentially connected with the inner wall surface of the cyclone air floatation tank, the oil-rich phase inlet and the water-rich phase inlet of the cyclone air floatation tank are respectively provided with a flow guiding structure, and the fluid entering the cyclone air floatation tank from the oil-rich phase inlet and the water-rich phase inlet is weak cyclone of-g through the flow guiding structure;
the cyclone air flotation tank is internally provided with an air dissolving mechanism, and tiny bubbles are continuously released in the cyclone air flotation tank by the air dissolving mechanism so that water, oil and air in the cyclone air flotation tank are further layered.
Further, central axes of the plurality of sleeves are parallel to each other, and inclination angles of the plurality of sleeves and a horizontal plane are all 10-35 degrees.
Further, the central axes of the plurality of sleeves are all positioned in the same longitudinal plane, and the central axes of the cyclone tube, the water-phase-enriched flow tube, the oil-water two-phase dynamic sedimentation tube and the water storage tube are sequentially arranged from top to bottom.
Further, a cyclone device used for driving the cyclone tube to rotate is arranged in the cyclone centrifugal separator, the cyclone device drives the cyclone tube to rotate so as to endow 50-1000g of liquid in the cyclone tube with centrifugal acceleration, a rectifying tube used for eliminating liquid disturbance is arranged in the cyclone centrifugal separator, a liquid outlet end of the rectifying tube is connected with a liquid inlet end of the cyclone tube, and a liquid inlet end of the rectifying tube is connected with a liquid outlet end of the liquid inlet tube for conveying oily sewage.
Further, a plurality of water draining holes are formed in the lower side wall surface of the oil-water two-phase dynamic sedimentation pipe, the water draining holes are covered by the water storage pipe, oil outlet pipes are arranged at the tops of the water storage pipe and the oil-water two-phase dynamic sedimentation pipe, an oil-phase-rich outlet pipe is coaxially inserted into the upper end of the cyclone pipe, and a water outlet pipe and a sand outlet are formed in the bottom of the water storage pipe;
the oil-phase-rich outlet pipe and the two oil outlet pipes are connected with the oil-rich phase inlet into a whole through pipelines, the water outlet pipe and the water-phase-rich inlet are connected with each other into a whole through pipelines, and the oil-phase-rich outlet pipe, the water outlet pipe and the two oil outlet pipes are internally provided with one-way valves.
Further, the side wall of the cyclone air floatation tank is provided with an oil phase outlet, the bottom elevation of the oil phase outlet is higher than the top elevation of the oil-rich phase inlet, the lower side of the side wall of the cyclone air floatation tank is provided with a water phase outlet, and the top elevation of the water phase outlet is lower than the bottom elevation of the water-rich phase inlet.
Further, the gas dissolving mechanism comprises a gas dissolving pump and a gas dissolving dispenser arranged in the cyclone gas floatation tank, wherein at least four nozzles of the gas dissolving dispenser are uniformly distributed at a half radius of a concentric circle of the cross section of the cyclone gas floatation tank, so that microbubbles in the cyclone gas floatation tank can be distributed on the cross section of the cyclone gas floatation tank in an optimal mode;
the cyclone air flotation tank is characterized in that a dissolved air inlet and a dissolved air outlet are respectively arranged on the lower side of the side wall of the cyclone air flotation tank, a liquid phase inlet of the dissolved air pump is connected with the dissolved air liquid phase outlet through a pipeline, a gas phase inlet of the dissolved air pump is connected with a dissolved air source through a pipeline, a dissolved air outlet of the dissolved air pump is connected with the dissolved air liquid inlet through a pipeline, and dissolved air and liquid at the outlet of the dissolved air pump enter the cyclone air flotation tank in a jet flow mode and are mixed with liquid in the cyclone air flotation tank.
Further, the main body of the cyclone air floatation tank is a vertical cylindrical shell, the top and the bottom of the cyclone air floatation tank are sealed and connected by a hemispherical shell, the top and the bottom of the cyclone air floatation tank are respectively provided with a gas phase outlet and a impurity accumulation outlet, and the solution gas-liquid inlet and the water phase outlet are internally provided with one-way valves.
Further, stop valves are arranged in the water-rich phase inlet, the oil-rich phase inlet, the gas-liquid outlet and the water phase outlet, the flow measurement and control system is arranged in the water-rich phase inlet and the water phase outlet, and the liquid level adjustment and control system is matched with the corresponding stop valves and the flow measurement and control system to adjust and control the fluctuation range of the liquid level in the fluid in the cyclone air flotation tank.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention combines the centrifugal separation technology, so that the inter-phase separation speed of the oil-water mixed liquid is improved by tens or even hundreds of times compared with the gravity sedimentation separation speed, thereby reducing the volume of the separator by tens of times compared with the volume of the gravity sedimentation separation, and fully reflecting the advantages of small size, small occupied area and light weight; the multi-layer sleeve is arranged and is installed in a non-concentric inclined mode, so that the oil-water of the separated water-rich phase is subjected to gravity sedimentation, the inter-phase separation efficiency of the oil-water two phases can be further accelerated, and solid-phase impurities in the mixed liquid can be primarily removed.
2. According to the invention, the separated rich oil phase and the separated rich water phase enter the cyclone air floatation tank in a weak cyclone mode, so that the rising speed of tiny bubbles released in the cyclone air floatation tank and tiny oil drops in fluid is slowed down, the migration distance is prolonged, the coalescence probability of the tiny bubbles and the tiny oil drops is increased, the separation efficiency of the oil phase and the water phase is increased, and the purification effect of improving the water quality in the cyclone air floatation tank is further achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
FIG. 1 is a schematic diagram of the overall structure of a multi-layer sleeve cyclone-air floatation device for fine separation of low-oil-content sewage;
FIG. 2 is a schematic diagram of the overall structure of a cyclone separator in a multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage;
FIG. 3 is a schematic diagram of the overall structure of a cyclone floatation tank in the multi-layer sleeve cyclone-floatation device for finely separating low-oil-content sewage;
fig. 4 is a sectional view of a multi-layer sleeve in the multi-layer sleeve cyclone-air floatation device for fine separation of low-oil-containing sewage.
Reference numerals in the drawings are respectively as follows:
1-a liquid inlet pipe; 2-a dosing system; 3-rectifying tube; 4-a spinning device; 5-swirl tube; 6-an oil-rich phase outlet pipe; 7-a water-phase-enriched flow pipe; 8-an oil-water two-phase dynamic sedimentation pipe; 9-a water discharge hole; 10-an oil outlet pipe; 11-a water storage pipe; 12-a water outlet pipe; 13-a sand outlet; 14-a rotational flow air floatation tank; 15-a dissolved air pump; 16-a dissolved gas spreader; 17-a water-rich phase inlet; 18-an oil-rich phase inlet; 19-a dissolved gas-liquid outlet; 20-a gas-liquid inlet; 21-an oil phase outlet; 22-gas phase outlet; 23-outlet of aqueous phase; 24-impurity accumulation outlet; 25-level regulation and control system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a multi-layer sleeve rotational flow-air floatation device for finely separating low-oil-content sewage, which is suitable for finely treating the oil-content sewage at the rear end of oil-gas-water three-phase separation, pretreating the oil-content sewage after atmospheric and vacuum electric desalting in a refinery and finely treating other low-oil-content sewage, and is shown in the reference diagram, and the invention comprises the following steps:
the device comprises a cyclone centrifugal separator, a cyclone air floatation tank 14, an electromagnetic valve, a dosing system 2, a flow measurement and control system and a liquid level regulation and control system 25, and is characterized in that: the cyclone centrifugal separator is formed by non-concentric inclined installation of a plurality of layers of sleeves, the multi-layer sleeves are respectively provided with a cyclone pipe 5, a water-phase-enriched flow pipe 7, an oil-water two-phase dynamic sedimentation pipe 8 and a water storage pipe 11 from inside to outside, the lower side wall surface of the oil-water two-phase dynamic sedimentation pipe 8 is provided with a plurality of water discharge holes 9, and the water discharge holes 9 are covered by the water storage pipe 11;
referring to fig. 2 and 4, central axes of the multiple sleeves are parallel to each other, the central axes of the multiple sleeves are all located in the same longitudinal plane, central axes of the cyclone tube 5, the water-rich phase flow tube 7, the oil-water two-phase dynamic sedimentation tube 8 and the water storage tube 11 are sequentially arranged from top to bottom, the inclination angles of the multiple sleeves and the horizontal plane are all 10-35 degrees, the vertical height of the cyclone centrifugal separator can be increased by obliquely placing the multiple layers of sleeves, the gravity sedimentation effect is enhanced, and the purification of the water phase in the water storage tube 11 is particularly beneficial to the accumulation of a small amount of oil phase in the bottom of the upper end and the accumulation and collection of solid phase particles (if any) in liquid in the liquid at the bottom of the lower end in the water storage tube 11;
the cyclone centrifugal separator is internally provided with a cyclone 4 for driving the cyclone tube 5 to rotate, and the cyclone 4 drives the cyclone tube 5 to rotate so as to endow 50-1000g of liquid in the cyclone tube 5 with centrifugal acceleration, so that the inter-phase separation speed of the oil-water mixed liquid is improved by tens or hundreds of times compared with the gravity sedimentation separation speed, the volume of the separator is reduced by tens of times compared with the volume of the gravity sedimentation separation, the advantages of small size, small occupied area and light weight are fully reflected, and tiny dispersed oil drops in low-oil-containing sewage can be quickly gathered to form an oil (gas) core at the axial position of the cyclone tube, so that the quick separation of oil and water phases is realized;
a rectifying tube 3 for eliminating turbulence of incoming liquid is arranged in the cyclone centrifugal separator, so that turbulence and unevenness of incoming liquid can be effectively reduced, the centrifugal separation effect of the cyclone can be improved, the liquid outlet end of the rectifying tube 3 is connected with the liquid inlet end of a cyclone tube 5, and the liquid inlet end of the rectifying tube 3 is connected with the liquid outlet end of a liquid inlet tube 1 for conveying oily sewage;
furthermore, the multi-layer inclined sleeve cyclone centrifugal separator is provided with the water-phase-enriched circulating pipe 7 and the oil-water two-phase dynamic sedimentation pipe 8, so that the migration distance of fluid can be prolonged, the residence time of the fluid in the separator can be prolonged, the oil phase and the water phase of the oil-water mixture can float upwards and sink in the flowing process, and the gravity sedimentation efficiency can be improved;
further, the dynamic gravity settling separation of the oil and water of the water-rich phase is performed in a narrow annular space of the sleeve pipe rich in the water-rich phase runner pipe 7 and the oil-water two-phase dynamic settling pipe 8, which leads to short distance between oil phase floating and water phase sinking and highlights the shallow pool effect in the gravity settling process, and the narrow annular space between the sleeves can greatly reduce the flow Reynolds number, so that the flow in the annular sleeve pipe is maintained in a laminar state, and further the inter-phase separation of the oil and water two phases is accelerated and the separation efficiency is improved;
the above is a specific structure of the cyclone centrifugal separator, and the specific structure of the cyclone tank 14 will be described in detail below:
referring to fig. 3, the main body of the cyclone air floatation tank 14 is a vertical cylindrical shell, the top and the bottom of the cyclone air floatation tank 14 are respectively sealed by a hemispherical shell, a gas phase outlet 22 and a impurity accumulation outlet 24 are respectively arranged at the top and the bottom of the cyclone air floatation tank 14, the gas phase outlet 22 is used for discharging relatively clean gas phase solid phase impurities in the cyclone air floatation tank 14, the impurity accumulation outlet 24 is used for discharging relatively clean gas phase solid phase impurities, and a gas dissolving mechanism is arranged in the cyclone air floatation tank 14;
the gas dissolving mechanism comprises a gas dissolving pump 15 and a gas dissolving and dispersing device 16 arranged in the cyclone gas floatation tank 14, wherein the number of the nozzles of the gas dissolving and dispersing device 16 is at least four (the number of the nozzles is determined according to the size of the cross section area of the cyclone gas floatation tank 14), and the plurality of the nozzles are uniformly distributed at a radius of one half of a concentric circle of the cross section of the cyclone gas floatation tank 14, so that microbubbles in the cyclone gas floatation tank 14 can be distributed on the cross section of the cyclone gas floatation tank 14 in an optimal manner (the microbubbles are linearly distributed from the center of the tank to the wall of the tank, the maximum is at the center, and the minimum is at the wall surface);
the lower side of the side wall of the cyclone air floatation tank 14 is respectively provided with a dissolved air inlet 20 and a dissolved air outlet 19, the liquid phase inlet of the dissolved air pump 15 is connected with the dissolved air liquid phase outlet 19 through a pipeline, the gas phase inlet of the dissolved air pump 15 is connected with the dissolved air source through a pipeline, the dissolved air outlet of the dissolved air pump 15 is connected with the dissolved air inlet 20 through a pipeline, and the dissolved air and liquid at the outlet of the dissolved air pump 15 enter the cyclone air floatation tank 14 in a jet flow mode and are mixed with liquid in the cyclone air floatation tank 14, and a dissolved air mechanism continuously releases tiny bubbles in the cyclone air floatation tank 14 so that water, oil and gas in the cyclone air floatation tank are further layered;
referring to fig. 1, the top of the water storage pipe 11 and the oil-water two-phase dynamic settling pipe 8 are respectively provided with an oil outlet pipe 10, the upper end of the cyclone pipe 5 is coaxially inserted with an oil-phase-enriched outlet pipe 6, the bottom of the water storage pipe 11 is provided with a water outlet pipe 12 and a sand outlet 13, the side walls of the cyclone air floatation tank 14 are respectively provided with an oil-rich phase inlet 18 and a water-rich phase inlet 17 from top to bottom, the oil-phase-enriched outlet pipe 6 and the two oil outlet pipes 10 are respectively connected into a whole by adopting pipelines and the oil-rich phase inlet 18, the water outlet pipe 12 and the water-rich phase inlet 17 are respectively connected into a whole by adopting pipelines, the oil-rich phase inlet 18 and the water-rich phase inlet 17 are respectively connected with the inner wall surfaces of the cyclone air floatation tank 14 in a tangential manner, flow guiding structures are respectively arranged at the oil-rich phase-enriched inlet 18 and the water-rich phase inlet 17 of the cyclone air floatation tank 14, fluid entering the cyclone air floatation tank 14 is 1-5g from top through the flow guiding structures, the weak cyclone air floatation tank 14 reduces the migration speed of tiny bubbles released by the container dispenser 16 in the air floatation tank 14 and the fluid, and the micro bubbles in the micro-bubbles in the fluid flow channels, and the micro-air bubbles in the cyclone air floatation tank 12 and the micro bubbles are respectively arranged, and the micro-bubbles are separated from the water outlet pipe and the air floatation tank 10, and the water outlet pipe is added, and the air floatation valve is arranged, and the inside the micro-air valve is arranged, and the inside the air floatation valve is further has a purifying effect and has a purifying effect;
the side wall of the cyclone air flotation tank 14 is provided with an oil phase outlet 21, and the bottom elevation of the oil phase outlet 21 is higher than the top elevation of the oil-rich phase inlet 18, so that convection between the oil-rich phase inlet 18 and the oil phase outlet 21 can be avoided, the oil-water two phases in the cyclone air flotation tank 14 discharged by the oil-rich phase inlet 18 are further separated, the purity of oil discharged by the oil phase outlet 21 is ensured, the lower side of the side wall of the cyclone air flotation tank 14 is provided with an aqueous phase outlet 23, and the top elevation of the aqueous phase outlet 23 is lower than the bottom elevation of the water-rich phase inlet 17, so that convection between the water-rich phase 17 and the aqueous phase outlet 23 is avoided, and the cleanliness of water discharged by the aqueous phase outlet 23 is improved.
The following is combined with the above-mentioned multi-layer sleeve cyclone-air floatation device for fine separation of low-oil-content sewage, and details of the specific technological process of the multi-layer sleeve cyclone-air floatation device for fine separation of low-oil-content sewage are described:
the oil-water mixed liquid (which can contain a small amount of gas) enters a cyclone centrifugal separator through a liquid inlet pipe 1, low-oil-content sewage is added with demulsifier and/or water scavenger through a dosing system 2 at the pipe section of the liquid inlet pipe 1, liquid turbulence is eliminated through a rectifying pipe 3, then the mixed liquid is rotated under the action of centrifugal force by utilizing a cyclone 4, so that an oil phase (including gas phase) with lower density is accumulated at the axial center part of the cyclone pipe 5, the water phase with higher density is distributed near the wall surface of the cyclone pipe 5, the water phase with higher density sequentially enters a water phase-rich flow pipe 7, an oil-water two-phase dynamic settling pipe 8 and a water storage pipe 11, dynamic gravity settling is realized step by step, oil-water sand separation of the water phase is carried out, the separated water phase flows through a water outlet pipe 12 of the water storage pipe 11 into the middle part of the air floatation tank through a water phase-rich inlet 17 of the wall surface of the air floatation tank, sand particles accumulated at the bottom end of the water storage pipe 11 are discharged through a sand outlet 13, and the oil phase separated by the cyclone pipe 5, the water phase with higher density dynamic settling pipe 8 and the water storage pipe 11 enter the air floatation tank at the upper side of the air floatation tank through an oil phase inlet 18 of the air floatation tank after the oil phase is accumulated;
the water-rich phase and the oil-rich phase flow into the cyclone air floatation tank 14 in a tangential cyclone mode along the wall surface to form weak cyclone with the centrifugal acceleration in the range of 1-5g, the liquid phase inlet of the dissolved air pump 15 is connected with the dissolved air liquid outlet 19 of the cyclone air floatation tank 14 by a pipeline, the gas phase inlet of the dissolved air pump 15 is connected with a pipeline for a dissolved air source (if the air source uses air, the gas source inlet of the dissolved air pump is opened); the dissolved gas-liquid cyclone tank 14 with the dissolved gas inlet 20 at the outlet of the dissolved gas pump enters the dissolved gas dispenser 16 arranged in the cyclone tank to be mixed with the liquid in the cyclone tank 14 in a jet flow mode, and simultaneously, tiny bubbles are released to be converged with tiny oil drops in the liquid under the action of surface tension and rise to the upper part of the cyclone tank 14 under the action of Archimedes buoyancy, so that relatively clean gas phase is accumulated at the top of the cyclone tank 14, relatively clean oil phase is accumulated at the upper part of the cyclone tank 14, relatively clean water phase is accumulated at the lower part of the cyclone tank 14, accumulated impurities are accumulated at the bottom of the cyclone tank 14, and finally, the gas phase, the oil phase, the water phase and the accumulated impurities are discharged through the oil phase outlet 21, the gas phase outlet 22, the water phase outlet 23 and the accumulated impurities outlet 24, all operations are performed under the control of the liquid level adjusting and controlling system 25, and the oil content in the water discharged from the water phase outlet 23 of the tank after sewage treatment can be not more than 20ppm.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements may be made to the present application by those skilled in the art, which modifications and equivalents are also considered to be within the scope of the present application.
Claims (9)
1. The utility model provides a low oily sewage fine separation's multilayer sleeve pipe whirl-air supporting device, includes whirl centrifugal separator and whirl air supporting jar (14), and solenoid valve, dosing system (2), flow measurement and control system, liquid level control and control system (25), its characterized in that: the cyclone centrifugal separator is formed by non-concentric inclined installation of a plurality of layers of sleeves, wherein the sleeves are respectively provided with a cyclone pipe (5), a water-phase-enriched flow pipe (7), an oil-water two-phase dynamic sedimentation pipe (8) and a water storage pipe (11) from inside to outside;
the side wall of the cyclone air flotation tank (14) is respectively provided with an oil-rich phase inlet (18) and a water-rich phase inlet (17) from top to bottom, the oil-rich phase inlet (18) and the water-rich phase inlet (17) are tangentially connected with the inner wall surface of the cyclone air flotation tank (14), flow guide structures are arranged at the oil-rich phase inlet (18) and the water-rich phase inlet (17) of the cyclone air flotation tank (14), and the fluid entering the cyclone air flotation tank (14) from the oil-rich phase inlet (18) and the water-rich phase inlet (17) is 1-5g of weak cyclone through the flow guide structures;
the cyclone air flotation tank (14) is internally provided with an air dissolving mechanism, and tiny bubbles are continuously released in the cyclone air flotation tank (14) by the air dissolving mechanism so that water, oil and air in the cyclone air flotation tank are further layered.
2. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 1, wherein,
the central axes of the plurality of sleeves are parallel to each other, and the inclination angles of the plurality of sleeves and the horizontal plane are all 10-35 degrees.
3. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 1, wherein,
the central axes of the sleeves are all positioned in the same longitudinal plane, and the central axes of the cyclone tube (5), the water-rich phase flow tube (7), the oil-water two-phase dynamic sedimentation tube (8) and the water storage tube (11) are sequentially arranged from top to bottom.
4. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 1, wherein,
the cyclone centrifugal separator is internally provided with a cyclone (4) used for driving the cyclone tube (5) to rotate, the cyclone (4) drives the cyclone tube (5) to rotate so as to endow 50-1000g of liquid in the cyclone tube (5) with centrifugal acceleration, the cyclone centrifugal separator is internally provided with a rectifying tube (3) used for eliminating liquid disturbance, the liquid outlet end of the rectifying tube (3) is connected with the liquid inlet end of the cyclone tube (5), and the liquid inlet end of the rectifying tube (3) is connected with the liquid outlet end of the liquid inlet tube (1) for conveying oily sewage.
5. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 1, wherein,
the oil-water two-phase dynamic sedimentation pipe is characterized in that a plurality of water draining holes (9) are formed in the lower side wall surface of the oil-water two-phase dynamic sedimentation pipe (8), the water draining holes (9) are covered by the water storage pipe (11), oil outlet pipes (10) are arranged at the tops of the water storage pipe (11) and the oil-water two-phase dynamic sedimentation pipe (8), an oil-phase rich outlet pipe (6) is coaxially inserted into the upper end of the cyclone pipe (5), and a water outlet pipe (12) and a sand outlet (13) are formed in the bottom of the water storage pipe (11);
the oil-rich phase outlet pipe (6) and the two oil outlet pipes (10) are connected into a whole through pipelines and the oil-rich phase inlet (18), the water outlet pipe (12) and the water-rich phase inlet (17) are connected into a whole through pipelines, and one-way valves are arranged in the oil-rich phase outlet pipe (6), the water outlet pipe (12) and the two oil outlet pipes (10).
6. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 1, wherein,
the side wall of the cyclone air flotation tank (14) is provided with an oil phase outlet (21), the bottom elevation of the oil phase outlet (21) is higher than the top elevation of the oil-rich phase inlet (18), the lower side of the side wall of the cyclone air flotation tank (14) is provided with an aqueous phase outlet (23), and the top elevation of the aqueous phase outlet (23) is lower than the bottom elevation of the water-rich phase inlet (17).
7. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 6, wherein,
the gas dissolving mechanism comprises a gas dissolving pump (15) and gas dissolving diffusers (16) arranged in the cyclone gas floatation tank (14), wherein at least four nozzles of the gas dissolving diffusers (16) are uniformly distributed at a half radius of a concentric circle of the cross section of the cyclone gas floatation tank (14), so that microbubbles in the cyclone gas floatation tank (14) can be distributed on the cross section of the cyclone gas floatation tank (14) in an optimal mode;
the cyclone air flotation tank is characterized in that a solution gas-liquid inlet (20) and a solution gas-liquid outlet (19) are respectively arranged on the lower side of the side wall of the cyclone air flotation tank (14), a liquid phase inlet of the solution gas pump (15) is connected with the solution gas-liquid outlet (19) through a pipeline, a gas phase inlet of the solution gas pump (15) is connected with a gas source through a pipeline, a gas solution outlet of the solution gas pump (15) is connected with the solution gas-liquid inlet (20) through a pipeline, and solution gas and liquid at the outlet of the solution gas pump (15) enter the cyclone air flotation tank (14) in a jet flow mode and are mixed with liquid in the cyclone air flotation tank (14).
8. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 7, wherein,
the main body of the cyclone air flotation tank (14) is a vertical cylindrical shell, the top and the bottom of the cyclone air flotation tank are sealed and connected by a hemispherical shell, a gas phase outlet (22) and a impurity accumulation outlet (24) are respectively arranged at the top and the bottom of the cyclone air flotation tank (14), and one-way valves are respectively arranged in the solution gas-liquid inlet (20) and the water phase outlet (23).
9. The multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage according to claim 8, wherein,
stop valves are arranged in the water-rich phase inlet (17), the oil-rich phase inlet (18), the gas-liquid outlet (19) and the water phase outlet (23), the flow measurement and control system is arranged in the water-rich phase inlet (17) and the water phase outlet (23), and the liquid level regulation and control system (25) is matched with the corresponding stop valves and the flow measurement and control system to regulate and control the fluctuation range of the liquid level of the fluid in the cyclone air flotation tank (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310282526.2A CN116495829A (en) | 2023-03-22 | 2023-03-22 | Multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310282526.2A CN116495829A (en) | 2023-03-22 | 2023-03-22 | Multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116495829A true CN116495829A (en) | 2023-07-28 |
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ID=87320866
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310282526.2A Pending CN116495829A (en) | 2023-03-22 | 2023-03-22 | Multi-layer sleeve cyclone-air floatation device for finely separating low-oil-content sewage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116495829A (en) |
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2023
- 2023-03-22 CN CN202310282526.2A patent/CN116495829A/en active Pending
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