CN115518779A - Oily sewage cyclone separation device and separation method - Google Patents
Oily sewage cyclone separation device and separation method Download PDFInfo
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- CN115518779A CN115518779A CN202110703583.4A CN202110703583A CN115518779A CN 115518779 A CN115518779 A CN 115518779A CN 202110703583 A CN202110703583 A CN 202110703583A CN 115518779 A CN115518779 A CN 115518779A
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- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/24—Multiple arrangement thereof
- B04C5/28—Multiple arrangement thereof for parallel flow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
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Abstract
The invention discloses a cyclone separation device and a separation method for oily sewage, wherein the device comprises: the separator comprises a separating cylinder, a cyclone assembly and a gas brewing assembly; the cyclone assembly comprises a first cyclone and a second cyclone with centrifugal force larger than that of the first cyclone; the upper end of the separating cylinder is provided with an overflow port, the lower end of the separating cylinder is provided with an outer inverted cone, an inner inverted cone is arranged in the outer inverted cone, the inner inverted cone is positioned below the first cyclone, and the lower end of the inner inverted cone is provided with a reclaimed water outlet; a water purification channel is formed between the outer wall of the inner inverted cone and the inner wall of the outer inverted cone; the bubble manufacturing assembly comprises a first bubble manufacturing device, a second bubble manufacturing device and a centrifugal pump, and the first cyclone is used for separating a bubble mixed solution of oily sewage to be treated; the second cyclone is used for separating the reclaimed water bubble mixed liquor generated by the first cyclone. The separation of oil drops with larger particle size and oil drops with micro-fine particle size is realized by primary and fine cyclone air flotation separation of the oily sewage, the oil-water separation efficiency and the separation precision are improved, and the oil-water separation speed is accelerated.
Description
Technical Field
The invention relates to the technical field of oily sewage treatment, in particular to a cyclone separation device and a cyclone separation method for oily sewage.
Background
The oil field in China enters a high water content exploitation stage at the later development stage, the yield of produced water is increased year by year, and the treatment of oily sewage is an important problem facing the development of the oil field and the environmental protection.
In practice, the difference of the particle size distribution of oil droplets in oily sewage is large, for example, the particle size of oil droplets of dissolved oil is generally less than 0.1 μm, and the particle size of oil droplets of dispersed oil is generally between 10 and 100 μm, which makes the requirements for the separation of oily sewage more strict;
the main technologies of the existing oily sewage treatment include physical methods, chemical methods, physical and chemical methods and biological methods. Effluent treated by a chemical method can generally meet the requirements of reinjection or discharge, but has the problems of low crude oil recovery rate, large medicament dosage, generation of oily sludge, high operation cost and the like; the biological method is a method in which oil is decomposed into carbon dioxide and water by the metabolic activities of microorganisms, and the like, and the method is poor in flexibility in operation and limited in volume load because the amount of microorganisms attached to the surface of a carrier is difficult to control;
therefore, physical methods, physical and chemical methods and multi-physical method integration technologies gradually become the first choice of the oily sewage treatment technology, and the physical methods mainly comprise air flotation separation, cyclone separation and coarse granulation separation. Cyclonic separation is a separation method based on the difference in density between two phases (gas/solid, liquid/solid, gas/liquid, liquid/liquid) using centrifugal force to separate the two phases. Although the density difference between the oil phase and the water phase is more than 0.05g/cm at present 3 In the case of (2), oil droplets larger than 10 μm can be effectively removed, but the removal rate of oil droplets having a particle size of less than 8 μm by a single cyclone separation method does not exceed 40%. Therefore, the structure optimization design of the cyclone separation equipment based on process intensification isThe key for improving the cyclone separation treatment efficiency of the oily sewage.
Disclosure of Invention
The invention aims to provide a cyclone separation device and a cyclone separation method for oily sewage, which have simple structure, realize the separation of oil drops with larger particle size and oil drops with fine particle size in the oily sewage by primary and fine cyclone air flotation of the oily sewage, improve the oil-water separation efficiency and accelerate the oil-water separation speed.
As an aspect of an embodiment of the present invention, an embodiment of the present invention provides an oily sewage cyclone separation apparatus, including: the separation cylinder cyclone assembly and the air bubble manufacturing assembly;
the cyclone assembly comprises a first cyclone and a second cyclone with centrifugal force larger than that of the first cyclone, the first cyclone is arranged at the lower part of the separating cylinder, and the second cyclone is arranged at the upper part of the separating cylinder;
the upper end of the separation cylinder is provided with an overflow port, the lower end of the separation cylinder is provided with an outer inverted cone, an inner inverted cone is arranged in the outer inverted cone, the inner inverted cone is positioned below the first cyclone, and the lower end of the inner inverted cone is provided with a reclaimed water outlet; a water purifying channel is formed between the outer wall of the inner inverted cone and the inner wall of the outer inverted cone;
the bubble making assembly comprises a first bubble making device, a second bubble making device and a centrifugal pump;
the first cyclone is used for separating the bubble mixed liquid of the oily sewage to be treated so as to discharge the separated reclaimed water from the reclaimed water outlet to the centrifugal pump for pressurization; the second bubble manufacturing device is used for mixing pressurized reclaimed water with gas to form reclaimed water bubble mixed liquor, and the second cyclone is used for separating the reclaimed water bubble mixed liquor.
In one or some alternative embodiments, the liquid outlet of the first gas bubble making device may be in communication with the tangential liquid inlet of the first cyclone; the liquid outlet of the second bubble manufacturing device is communicated with the tangential liquid inlet of the second cyclone; and the inlet of the centrifugal pump is connected with the reclaimed water outlet of the inner inverted cone, and the outlet of the centrifugal pump is connected with the liquid inlet of the second bubble manufacturing device.
In one or some alternative embodiments, it may be that the gas inlet of the first gas brewing device is used for introducing gas at a first preset pressure; the liquid inlet of the first air bubble manufacturing device is used for introducing oily sewage to be treated with set flow rate;
the first gas bubble manufacturing device is used for mixing introduced oily sewage to be treated with gas with a first preset pressure to form a bubble mixed liquid of the oily sewage to be treated, and enabling the bubble mixed liquid of the oily sewage to be treated to tangentially enter the first cyclone.
In one or some alternative embodiments, the gas inlet of the second bubble generating device is used for introducing gas with a second preset pressure;
the second bubble manufacturing device is used for mixing the introduced gas with a second preset pressure and the reclaimed water introduced by the centrifugal pump to form reclaimed water bubble mixed liquid, and enabling the reclaimed water bubble mixed liquid to tangentially enter the second cyclone.
In one or some alternative embodiments, it may be that the centrifugal diameter of the second cyclone is smaller than the centrifugal diameter of the first cyclone.
In one or some alternative embodiments, there may be multiple groups of the second cyclones, the separation cylinder is circular, and the multiple groups of the second cyclones are uniformly arranged in the separation cylinder along the circumferential direction.
In one or some alternative embodiments, the number of the second cyclones may be two or three.
In one or some alternative embodiments, the reclaimed water outlet position may be provided with a baffle.
In one or some alternative embodiments, the shape of the baffle may be a crisscross structure.
As another aspect of the embodiments of the present invention, there is also provided an oil-containing sewage cyclone separation method, including:
enabling the oily sewage to be treated to pass through a first bubble manufacturing device to form a bubble mixed solution of the oily sewage to be treated, and tangentially entering a first cyclone to perform primary cyclone air flotation separation;
discharging oil drops, bubbles, oil drops and bubble compounds which are separated primarily from an overflow port, discharging purified water in the water phase separated primarily from the overflow port through a purified water channel, pressurizing the reclaimed water in the water phase separated primarily through a centrifugal pump, and introducing the pressurized reclaimed water into a second bubble manufacturing device;
enabling the reclaimed water to pass through a second bubble manufacturing device to form reclaimed water bubble mixed liquor, and tangentially entering a second cyclone to perform fine cyclone air flotation separation;
discharging the oil drops, the bubbles, the oil drops and the bubble compound which are finely separated from the overflow port, discharging the purified water in the water phase which is finely separated from the overflow port through a purified water channel, pressurizing the reclaimed water in the water phase which is finely separated from the overflow port through a centrifugal pump, and introducing the pressurized reclaimed water into a second bubble manufacturing device.
In the oil-containing sewage cyclone separation device provided by the embodiment of the invention, because the first cyclone and the second cyclone are arranged, the oil-containing sewage forms gas-water mixed liquid through the bubble manufacturing device, and tangentially enters the first cyclone, under the action of centrifugal force and buoyancy, the water phase moves outwards and downwards, oil drops with larger particle size and bubbles, oil drops and bubble compounds move inwards and upwards and are discharged, the separation of oil drops with larger particle size in the oil-containing sewage is realized, and the primary cyclone air flotation separation is completed; the water phase moving downwards forms purified water and reclaimed water through the inner inverted cone and the outer inverted cone, the reclaimed water contains oil drops with small particle sizes, the purified water is pressurized through the centrifugal pump, and the air bubbles are generated by the air bubble manufacturing device and then enter the second cyclone in a tangential direction, so that the separation of the oil drops with small particle sizes is realized, and the fine cyclone air flotation separation is completed. The oily sewage cyclone separation device has a simple structure, realizes separation of oil drops with larger particle sizes and separation of oil drops with fine particle sizes in oily sewage by primary and fine cyclone air flotation of the oily sewage, improves oil-water separation efficiency and separation precision, and accelerates oil-water separation.
The oily sewage cyclone separation method provided by the embodiment of the invention is simple to operate, realizes the separation of oil drops with larger particle sizes and the separation of oil drops with fine particle sizes in oily sewage by primary and fine cyclone air flotation of the oily sewage, improves the treatment efficiency and the separation precision of the oily sewage cyclone separation, and accelerates the oil-water separation speed. In addition, the method does not need to add coagulant, flocculant and other chemical agents, and has low operation cost.
Drawings
FIG. 1 is a schematic view of the overall structure of a cyclone separation device for oily sewage according to an embodiment of the present invention;
in the figure: 1. the device comprises a separating cylinder, 11, an overflow port, 12, an outer inverted cone, 13, a water purifying channel, 2, a first cyclone, 3, a second cyclone, 4, a first bubble manufacturing device, 5, a second bubble manufacturing device, 6, an inner inverted cone, 61, a reclaimed water outlet, 7 and a centrifugal pump.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of the separation method of the oily wastewater cyclonic separation apparatus of the present disclosure as detailed in the appended claims.
An embodiment of the present invention provides a cyclone separation apparatus for oily sewage, as shown in fig. 1, including:
the device comprises a separating cylinder 1, a cyclone assembly and an air bubble manufacturing assembly;
the cyclone assembly comprises a first cyclone 2 and a second cyclone 3, the first cyclone 2 is arranged at the lower part of the separating cylinder 1, and the second cyclone 3 is arranged at the upper part of the separating cylinder 1; the centrifugal force of the second swirler 3 is greater than the centrifugal force of the first swirler 3;
the upper end of the separation cylinder 1 is provided with an overflow port 11, and the lower end of the separation cylinder 1 is provided with an external inverted cone 12;
an inner inverted cone 6 is arranged in the outer inverted cone 12, the inner inverted cone 6 is positioned below the first swirler 2, and a reclaimed water outlet 61 is arranged at the lower end of the inner inverted cone 6;
a water purifying channel 13 is formed between the outer wall of the inner inverted cone 6 and the inner wall of the outer inverted cone 12;
the bubble making assembly comprises a first bubble making device 4, a second bubble making device 5 and a centrifugal pump 7;
the first gas bubble manufacturing device 4 is used for mixing the oily sewage to be treated with gas to form a gas bubble mixed solution of the oily sewage to be treated, and enabling the gas bubble mixed solution to tangentially enter the first cyclone 2;
the first cyclone 2 is used for separating the introduced bubble mixed liquid of the oily sewage to be treated so as to discharge the separated reclaimed water from a reclaimed water outlet 61 to the centrifugal pump 7 for pressurization and discharge the separated purified water through a purified water forming channel 13;
the second bubble manufacturing device 5 is used for mixing the pressurized reclaimed water with gas to form a reclaimed water bubble mixed solution, and enabling the reclaimed water bubble mixed solution to tangentially enter the second cyclone 3;
the second cyclone is used for separating the introduced recycled water bubble mixed liquid, so that the separated recycled water is discharged from the recycled water outlet 61 to the centrifugal pump 7 for pressurization, and the separated purified water is discharged through the purified water channel 13.
In the cyclone separation device for oily sewage provided by the embodiment of the invention, the liquid outlet of the first air bubble manufacturing device 4 is communicated with the tangential liquid inlet of the first cyclone 2, so that the air bubble mixed liquid of the oily sewage to be treated, which is formed by the first air bubble manufacturing device 4, can tangentially enter the first cyclone 2 for primary cyclone air flotation separation;
a liquid outlet of the second bubble manufacturing device 5 is communicated with a tangential liquid inlet of the second cyclone 3; the inlet of the centrifugal pump 7 is connected with the reclaimed water outlet 61 of the inner inverted cone 6, the outlet of the centrifugal pump 7 is connected with the liquid inlet of the second bubble manufacturing device 5, so that reclaimed water obtained after primary cyclone air flotation separation is carried out on the bubble mixed liquid of oily sewage to be treated through the first cyclone 2 is discharged from the reclaimed water outlet 51, and the reclaimed water bubble mixed liquid formed by the second bubble manufacturing device 4 after being pressurized through the centrifugal pump 7 can tangentially enter the second cyclone 3 for fine cyclone air flotation separation.
The specific structures of the first bubble making device 4 and the second bubble making device 5 described in the embodiment of the present invention may refer to the description of related implementation manners of gas-liquid mixing equipment in the prior art, as long as the introduction of the oily wastewater to be treated and the pressurized gas can be realized, so that the highly dispersed micro bubbles are used as carriers to adhere to the contaminants in the oily wastewater, a large number of micro bubbles are formed in the oily wastewater, the contaminants are made to adhere to the bubbles and float to the water surface in a suspended state, and a gas-liquid mixture of the oily wastewater and the bubbles is obtained.
The specific structures of the first cyclone 2 and the second cyclone 3 described in the embodiments of the present invention may refer to the description of related implementations of a cyclone separation apparatus in the prior art, as long as the purpose of separating oil droplets, bubbles, oil droplets and bubble compounds in the gas-water mixed liquid from the water phase by using the density difference between two or more phases under the action of centrifugal force can be achieved, which is not specifically limited in the embodiments of the present invention.
In the embodiment of the invention, because the particle size of oil drops in the bubble mixed liquid of the oily sewage to be treated formed in the first bubble manufacturing device 4 is larger than that of the oil drops in the bubble mixed liquid of the medium water formed in the second bubble manufacturing device 5, the centrifugal force of the second cyclone 3 is larger than that of the first cyclone 2, after the first cyclone 2 separates oil drops with larger particle size in the bubble mixed liquid of the oily sewage to be treated, the oil drops with smaller particle size in the bubble mixed liquid of the medium water are separated by the second cyclone 3, so that two-stage separation of the oily sewage is realized more accurately, and the oil-water separation effect is good.
The specific arrangement of the first cyclone 2 and the second cyclone 3 in the separation cylinder 1 described in the embodiment of the present invention may refer to the description of the related technical solutions in the prior art, as long as the first cyclone 2 and the second cyclone 3 can be fixed, and oil drops, bubbles, oil drops and bubble compounds separated by the first cyclone 2 and the second cyclone 3 can be discharged through the overflow port 11, the clean water separated by the first cyclone 2 and the second cyclone 3 can be discharged through the clean water channel 13, and the reclaimed water still containing part of the oil stains separated by the first cyclone 2 and the second cyclone 3 can enter the centrifugal pump 7 through the reclaimed water outlet 61, which is not particularly limited in the embodiment of the present invention.
In one embodiment, in the oil-containing sewage cyclone separation device provided by the embodiment of the invention, the gas inlet of the first gas bubble manufacturing device 4 is used for introducing gas with a first preset pressure; the liquid inlet of the first air bubble manufacturing device 4 is used for introducing oily sewage to be treated with a set flow rate;
the first gas bubble manufacturing device 4 is used for mixing introduced oily sewage to be treated with gas at a first preset pressure to form a gas bubble mixed solution of the oily sewage to be treated, and enabling the gas bubble mixed solution of the oily sewage to be treated to tangentially enter the first cyclone 2.
In an embodiment, in the oil-containing sewage cyclone separation device provided by the embodiment of the present invention, the gas inlet of the second bubble producing device 5 is used for introducing gas at a second preset pressure;
the second bubble manufacturing device 5 is configured to mix the introduced gas with a second preset pressure and the reclaimed water introduced by the centrifugal pump 7 to form a reclaimed water bubble mixed solution, and tangentially enter the reclaimed water bubble mixed solution into the second cyclone 3.
In a particular embodiment it may be that the centrifugal diameter of the second cyclone 3 is smaller than the centrifugal diameter of the first cyclone 2.
In the embodiment of the invention, because the separation of oil drops with larger particle sizes is realized in the first cyclone 2, the cyclone force can be relatively smaller, the volume of the gas-water mixed liquid in the first cyclone 2 is improved by increasing the centrifugal diameter, and the oil-water separation speed is increased, and the separation of oil drops with smaller particle sizes is realized in the second cyclone 3, so the requirement on the cyclone force of the cyclone is higher, and the oil-water separation capacity of the second cyclone 3 can be increased by reducing the centrifugal diameter, and the oil-water separation with higher precision is realized.
In an embodiment of the present invention, in the oily sewage cyclone separation apparatus provided in the embodiment of the present invention, the number of the second cyclones 3 is multiple, the separation cylinder 1 is circular, and the multiple groups of second cyclones 3 are uniformly arranged in the separation cylinder 1 along a circumferential direction.
In a particular embodiment, the number of second cyclones 3 may be two or three.
In one embodiment, the device for cyclone separation of oily sewage provided by the embodiment of the present invention is provided with a baffle (not shown in the figure) at the position of the reclaimed water outlet 61.
In the embodiment of the invention, when the water phase obtained by oil-water separation is discharged from the inner inverted cone 6 through the reclaimed water outlet 61, reclaimed water is easy to form rotational flow in the pipeline between the inner inverted cone 6 and the centrifugal pump 7, and in order to prevent rotational flow, a baffle (not shown in the figure) can be arranged at the position of the reclaimed water outlet 61, so that the water flow energy of the reclaimed water outlet is reduced, a slow flow effect is achieved, and the rotational flow influence is eliminated.
In the embodiment of the present invention, the baffle may be disposed at a vertically downward position of the reclaimed water outlet, and a specific arrangement manner of the baffle may be determined according to an actual use condition.
In a specific embodiment, the baffle may be in the shape of a cross structure.
In order to better understand the specific implementation manner of the oily sewage cyclone separation device provided by the embodiment of the invention, the following description is made on the oil-water separation process of the oily sewage by using a specific example:
when the oil-containing sewage cyclone separation device provided by the embodiment of the invention is used, firstly, oil-containing sewage to be treated and gas are respectively introduced into the first gas bubble manufacturing device 4 at preset pressure and speed, the gas in the first gas bubble manufacturing device 4 is dispersed in the oil-containing sewage in the form of micro-bubbles, and the particle size of the micro-bubbles is close to that of dispersed-phase oil drops in the sewage, so that a bubble mixed solution of the oil-containing sewage to be treated is formed; then, the bubble mixed liquid of the oily sewage to be treated enters the first cyclone 2 along the tangential direction, and the speed of the bubble mixed liquid of the oily sewage to be treated entering the first cyclone 2 along the tangential direction is controlled by controlling the hydraulic pressure of the oily sewage or the gas inlet flow of the bubble manufacturing device 4;
the first cyclone 2 carries out primary cyclone air flotation separation on the bubble mixed liquid of the oily sewage to be treated, the heavier water phase moves outwards and downwards under the action of centrifugal force and buoyancy, namely moves downwards along the inner wall of the separation cylinder 1, and the water phase moving downwards forms purified water and reclaimed water through an inner inverted cone 6 and an outer inverted cone 12; light components such as oil drops and bubbles move inwards and upwards, and in the process of transferring the light components, due to the density difference between the oil drops and the micro bubbles, the micro bubble transferring speed and the floating speed are high, so that the opportunity of contact between the oil drops and the micro bubbles is increased, oil drops and bubble compounds are formed by continuous contact and adhesion of the oil drops and the micro bubbles, the oil drops, the bubbles, the oil drops and the bubble compounds rise to the upper part of the separation cylinder 1 under the action of buoyancy to form an oil collecting area, the oil drops, the bubbles, the oil drops and the bubble compounds in the oil collecting area gradually rise under the action of pressure, and are finally discharged from an overflow port 11, so that the separation of oil drops with larger particle sizes in the oily sewage is realized, and the primary cyclone separation is completed;
because the inner inverted cone 6 is arranged in the outer inverted cone 12, under the condition that the rotational flow is not influenced by the inverted cone structure, the separation of purified water and reclaimed water is realized, the reclaimed water contains oil drops with small grain sizes, the purified water is discharged from the purified water channel 13, the reclaimed water enters the centrifugal pump 7 after passing through the baffle for slow flow, the reclaimed water is pressurized in the centrifugal pump 7 and then is introduced into the second bubble manufacturing device 5 at a preset pressure, gas is also introduced into the second bubble device 5, so that the gas in the second bubble manufacturing device 5 is dispersed in the reclaimed water containing the oil drops with small grain sizes in a micro-bubble mode, and the grain sizes of the micro-bubbles are close to the grain sizes of dispersed phase oil drops in sewage to form a reclaimed water bubble mixed solution; then, the reclaimed water bubble mixed liquor tangentially enters the second cyclone 3, and the speed of the reclaimed water bubble mixed liquor tangentially entering the second cyclone 3 can be controlled by controlling the hydraulic pressure of reclaimed water or the gas inlet flow of gas introduced into the second bubble manufacturing device 5;
the second cyclone 3 carries out fine cyclone air flotation separation on the mixed liquid of the medium water and the bubbles, the heavier water phase moves outwards and downwards under the action of centrifugal force and buoyancy, namely, the heavier water phase moves downwards along the inner wall of the separation cylinder 1, and the water phase moving downwards forms purified water and medium water through an inner inverted cone 6 and an outer inverted cone 12; the lighter components such as oil drops and bubbles move inwards and upwards, in the process of transferring the lighter components, due to the density difference between the oil drops and the micro bubbles, the micro bubble transferring speed and the floating speed are high, so that the contact chance of the oil drops and the micro bubbles is increased, oil drops and bubble compounds are formed through continuous contact and adhesion of the oil drops and the micro bubbles, the oil drops, the bubbles, the oil drops and the bubble compounds rise to an oil collecting area on the upper part of the separating cylinder 1 under the action of buoyancy force, gradually rise under the action of pressure and are finally discharged from the overflow port 11, and due to the fact that the centrifugal diameter of the second cyclone 3 is smaller than that of the first cyclone 2, separation of oil drops with smaller particle size in oily sewage can be achieved, and fine cyclone air flotation separation is completed.
In the embodiment of the present invention, the oil drops, the air bubbles, the oil drop and the air bubble compound discharged from the overflow port 11 may be discharged to a specific oil collecting container through a pipeline, and a specific implementation manner may refer to related descriptions in the prior art, and in the embodiment of the present invention, this may not be particularly limited.
In the embodiment of the present invention, as shown in the following examples 1 and 2, in order to ensure the oil-water separation effect in the process of performing oil-water separation by using the above-mentioned oily sewage cyclone separation device, according to the amount of oil content of the oily sewage and the average particle size of oil droplets, and the difference between the centrifugal diameters and the number of the first cyclone and the second cyclone, the feeding speed of the oily sewage and the gas inlet flow rate can be appropriately selected, and the efficiency of oil-water separation by the oily sewage cyclone separation device can be adjusted by adjusting the feeding speed and the gas leaching flow rate.
Example 1:
when the oily sewage cyclone separation device provided by the embodiment of the invention adopts the cyclone separation cylinder 1 with the cylinder diameter of 100mm and the height of 1500mm and the first cyclone with the diameter of 80mm, and 2 second cyclones 3 with the diameter of 20mm are arranged in the cyclone separation cylinder, oily sewage to be treated with the initial oily concentration of 502.6mg/L and the average oil drop particle size of d50=9.786 μm is fed into the cyclone separation cylinder 1 at the feeding speed of 450mL/min, and under the condition of the air inflow of 900mL/min, the oily sewage to be treated is subjected to cyclone air flotation treatment, the oily concentration of the obtained effluent is 46.2mg/L, the deoiling rate is 90.8%, and the average oil drop particle size of d50=4.325 μm.
Example 2:
when the cyclone separation device for oily sewage provided by the embodiment of the invention adopts the cyclone separation cylinder 1 with the cylinder diameter of 500mm and the height of 2000mm and the first cyclone with the diameter of 400mm, and 3 second cyclones 3 with the diameter of 80mm are arranged in the cyclone separation cylinder, oily sewage to be treated, the initial oily concentration of which is 450.5mg/L and the average grain size of oil drops of which is d50=9.259 mu m, is fed into the cyclone separation cylinder 1 at the feeding speed of 15L/min, and under the condition of the air inlet flow of 25L/min, the oily sewage to be treated is subjected to cyclone air flotation treatment, the oily concentration of the obtained effluent is 49.8mg/L, the deoiling rate is 88.9%, and the average grain size of the oil drops of which is d50=5.058 mu m.
In the oil-containing sewage cyclone separation device provided by the embodiment of the invention, because the first cyclone and the second cyclone are arranged, the oil-containing sewage forms gas-water mixed liquid through the bubble manufacturing device, and tangentially enters the first cyclone, under the action of centrifugal force and buoyancy, the water phase moves outwards and downwards, oil drops with larger particle sizes and bubbles, oil drops and bubble compounds move inwards and upwards and are discharged, the separation of oil drops with larger particle sizes in the oil-containing sewage is realized, and the primary cyclone air flotation separation is completed; the water phase moving downwards forms purified water and reclaimed water through the inner inverted cone and the outer inverted cone, the reclaimed water contains oil drops with small particle sizes, the purified water is pressurized through the centrifugal pump, and the air bubbles are generated by the air bubble manufacturing device and then enter the second cyclone in a tangential direction, so that the separation of the oil drops with small particle sizes is realized, and the fine cyclone air flotation separation is completed. The oily sewage cyclone separation device has a simple structure, realizes separation of oil drops with larger particle sizes and separation of oil drops with fine particle sizes in oily sewage by primary and fine cyclone air flotation of the oily sewage, improves oil-water separation efficiency and separation precision, and accelerates oil-water separation.
Based on the same inventive concept, the embodiment of the invention also provides a cyclone separation method of oily sewage, which comprises the following steps:
enabling the oily sewage to be treated to pass through a first bubble manufacturing device 4 to form a bubble mixed solution of the oily sewage to be treated, and tangentially entering a first cyclone 2 to perform primary cyclone air flotation separation;
discharging oil drops, bubbles, oil drop and bubble compounds which are primarily separated from an overflow port 11, discharging purified water in a water phase which is primarily separated from the water phase through a purified water channel 13, pressurizing the reclaimed water in the water phase which is primarily separated from the water phase through a centrifugal pump 7, and introducing the pressurized reclaimed water into a second bubble manufacturing device 5;
enabling the reclaimed water to pass through a second bubble manufacturing device 5 to form reclaimed water bubble mixed liquor, and tangentially entering a second cyclone 3 to perform fine cyclone air flotation separation;
discharging the oil drops, the bubbles, the oil drop and the bubble compound which are finely separated from each other from an overflow port 11, discharging the purified water in the water phase which is finely separated from each other through a purified water channel 13, pressurizing the reclaimed water in the water phase which is finely separated from each other through a centrifugal pump 7, and introducing the pressurized reclaimed water into a second bubble manufacturing device 5.
The specific implementation process of the oily sewage cyclone separation method provided by the embodiment of the present invention may refer to the specific description of the oily sewage cyclone separation device in the above embodiments, and is not described herein again.
The oily sewage cyclone separation method provided by the embodiment of the invention is simple to operate, realizes the separation of oil drops with larger particle sizes and the separation of oil drops with fine particle sizes in oily sewage by primary and fine cyclone air flotation of the oily sewage, improves the treatment efficiency and the separation precision of the oily sewage cyclone separation, and accelerates the oil-water separation speed. In addition, the method does not need to add coagulant, flocculant and other chemical agents, and has low operation cost.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. The utility model provides an oily sewage hydrocyclone separation device which characterized in that includes: the device comprises a separating cylinder (1), a cyclone assembly and an air bubble manufacturing assembly;
the cyclone assembly comprises a first cyclone (2) and a second cyclone (3) with centrifugal force larger than that of the first cyclone (2), the first cyclone (2) is arranged at the lower part of the separating cylinder (1), and the second cyclone (3) is arranged at the upper part of the separating cylinder (1);
an overflow port (11) is formed in the upper end of the separating cylinder (1), an outer inverted cone (12) is formed in the lower end of the separating cylinder (1), an inner inverted cone (6) is arranged in the outer inverted cone (12), the inner inverted cone (6) is located below the first swirler (2), and a reclaimed water outlet (61) is formed in the lower end of the inner inverted cone (6); a water purifying channel (13) is formed between the outer wall of the inner inverted cone (6) and the inner wall of the outer inverted cone (12);
the bubble making assembly comprises a first bubble making device (4), a second bubble making device (5) and a centrifugal pump (7);
the first gas bubble manufacturing device (4) is used for mixing oil-containing sewage to be treated with gas to form a gas bubble mixed solution of the oil-containing sewage to be treated, and the first cyclone (2) is used for separating the gas bubble mixed solution of the oil-containing sewage to be treated so as to discharge separated reclaimed water from a reclaimed water outlet (61) to a centrifugal pump (7) for pressurization; the second bubble manufacturing device (5) is used for mixing pressurized reclaimed water and gas to form reclaimed water bubble mixed liquid, and the second cyclone is used for separating the reclaimed water bubble mixed liquid.
2. The oily sewage cyclone separation device as claimed in claim 1, wherein the liquid outlet of the first air bubble making device (4) is communicated with the tangential liquid inlet of the first cyclone (2); the liquid outlet of the second bubble manufacturing device (5) is communicated with the tangential liquid inlet of the second cyclone (3); the inlet of the centrifugal pump (7) is connected with the reclaimed water outlet (61) of the inner inverted cone (6), and the outlet of the centrifugal pump (7) is connected with the liquid inlet of the second bubble manufacturing device (5).
3. The oily sewage cyclone separation device as claimed in claim 1, wherein the gas inlet of the first gas bubble manufacturing device (4) is used for introducing gas with a first preset pressure; the liquid inlet of the first air bubble manufacturing device (4) is used for introducing oil-containing sewage to be treated with set flow rate;
the first air bubble manufacturing device (4) is used for mixing introduced oily sewage to be treated with gas with a first preset pressure to form a bubble mixed liquid of the oily sewage to be treated, and enabling the bubble mixed liquid of the oily sewage to be treated to tangentially enter the first cyclone (2).
4. The oily sewage cyclone separation device as claimed in claim 1, wherein the gas inlet of the second bubble producing device (5) is used for introducing gas with a second preset pressure;
the second bubble manufacturing device (5) is used for mixing the introduced gas with a second preset pressure and the reclaimed water introduced by the centrifugal pump (7) to form reclaimed water bubble mixed liquid, and enabling the reclaimed water bubble mixed liquid to tangentially enter the second cyclone (3).
5. The oily sewage cyclone separation device according to claim 1, wherein the centrifugal diameter of the second cyclone (3) is smaller than that of the first cyclone (2).
6. The oily sewage cyclone separation device as claimed in claim 1, wherein the number of the second cyclones (3) is multiple groups, the separation cylinder (1) is circular, and the multiple groups of the second cyclones (3) are uniformly arranged in the separation cylinder (1) along the circumferential direction.
7. The oily sewage cyclone separation device as claimed in claim 6, wherein the number of the second cyclones (3) is two or three.
8. The oily sewage cyclone separation device as claimed in claims 1-7, wherein the position of the reclaimed water outlet (61) is provided with a baffle.
9. The rotational flow separation device for oily sewage as claimed in claim 8, wherein the baffle is in the shape of a crisscross structure.
10. A method for separating oily sewage by cyclone is characterized by comprising the following steps:
enabling the oily sewage to be treated to pass through a first bubble manufacturing device (4) to form a bubble mixed solution of the oily sewage to be treated, and tangentially entering a first cyclone (2) for primary cyclone air flotation separation;
discharging oil drops, bubbles, oil drops and bubble compounds which are separated out primarily from an overflow port (11), discharging purified water in a water phase separated primarily from the water phase through a purified water channel (13), pressurizing the reclaimed water in the water phase separated primarily through a centrifugal pump (7), and introducing the pressurized reclaimed water into a second bubble manufacturing device (5);
enabling the reclaimed water to pass through a second bubble manufacturing device (5) to form reclaimed water bubble mixed liquor, and tangentially entering a second cyclone (3) for fine cyclone air flotation separation;
discharging oil drops, bubbles, oil drop and bubble compounds which are finely separated from an overflow port (11), discharging purified water in a water phase which is finely separated from the overflow port through a purified water channel, pressurizing the reclaimed water in the water phase which is finely separated from the overflow port through a centrifugal pump (7), and introducing the pressurized reclaimed water into a second bubble manufacturing device (5).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117213894A (en) * | 2023-11-08 | 2023-12-12 | 青岛船研深海技术有限公司 | Abnormal operation monitoring system for ocean engineering equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117213894A (en) * | 2023-11-08 | 2023-12-12 | 青岛船研深海技术有限公司 | Abnormal operation monitoring system for ocean engineering equipment |
| CN117213894B (en) * | 2023-11-08 | 2024-01-26 | 青岛船研深海技术有限公司 | Abnormal operation monitoring system for ocean engineering equipment |
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