CN112357994A - Method and device for removing oil by air floatation with cold air - Google Patents
Method and device for removing oil by air floatation with cold air Download PDFInfo
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- CN112357994A CN112357994A CN202011221836.6A CN202011221836A CN112357994A CN 112357994 A CN112357994 A CN 112357994A CN 202011221836 A CN202011221836 A CN 202011221836A CN 112357994 A CN112357994 A CN 112357994A
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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
- C02F1/40—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
- C02F2209/00—Controlling or monitoring parameters in water treatment
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Abstract
The invention provides a method and a device for removing oil by utilizing cold air flotation, wherein the method comprises the following steps: the cold air prepared by the refrigeration equipment is divided into two paths, wherein the first path of cold air is led to a dissolved air-water generator containing production water, and the second path of cold air is led to an air flotation tank through a micro-bubble generator; the production water is separated out dissolved oil under the action of a first path of cold air, and the first path of cold air is dissolved into the production water under high pressure and is released into the air flotation tank through a pressure reducing valve; the second path of cold air generates low-temperature micro-bubbles in the micro-bubble generator, and the low-temperature micro-bubbles enter the air floating tank and further separate out dissolved oil in the production water; dissolved oil adhered with micro bubbles rises and is discharged through the air flotation tank; the treated production water is discharged from the lower part of the air flotation tank. The device comprises refrigeration equipment, a dissolved gas-water generator and a micro-bubble generator which are respectively connected with the refrigeration equipment, and an air floating tank which is respectively connected with the dissolved gas-water generator and the micro-bubble generator. The invention has simple structure, economy, high efficiency and strong adaptability.
Description
Technical Field
The invention belongs to the technical field of oil-water separation, and particularly relates to a method and a device for removing oil by utilizing air flotation of cold air, which are suitable for the high-efficiency oil removing process of production water in the process of exploiting land and offshore oil and gas fields, and are also suitable for the air flotation treatment process of oily wastewater in the industries of coal chemical industry, catering industry and the like.
Background
The current society is still in the industrial society stage, and the world economy is generally in relatively fast development phase, and is huge to oil gas demand, but industrial production such as oil and natural gas can produce a large amount of production water, because the production water quality in different places receives oil gas field exploitation duration, geographical position, oil deposit many parameter influences such as, consequently, along with the increase of production age, the produced water volume can increase usually, and this will lead to the water content in the produced fluid further increase and profit emulsification problem aggravation. If the oily sewage is directly discharged and flows into water bodies such as ocean lakes and the like, the ecological environment can be seriously damaged.
In the water production treatment in the prior art, free oil drops with the particle size of more than 100 microns can be separated through gravity settling, oil drops with the particle size of 15-30 microns can be removed through hydraulic cyclone, and air floatation treatment is needed for the oil drops with the particle size of 5-20 microns. The essence of air supporting deoiling lies in, and the collision mechanism and the adhesion mechanism of bubble and oil drop because the air microbubble can be in the same place with the oil drop of hydrophobicity, takes oil drop to rise together, and the buoyancy rises the speed increase, utilizes the microbubble characteristics many, that specific surface is big simultaneously, consequently, oil-water separation efficiency obtains promoting. However, the conventional air floatation method is often combined with chemical agents, so that the chemical agents are remained in a large amount in the production water, which is not beneficial to environmental protection.
CN102626560A discloses a cyclone air flotation oil-water separation device and an air flotation generator, which have simple structure and solve the defect of small oil content concentration range in air flotation treatment. However, the above patent technologies are optimized and modified for the structure of the air floating device, and no technical improvement is found for the characteristic that the solubility of oil in water is affected by temperature.
Disclosure of Invention
The invention provides a method and a device for removing oil by air floatation with cold air, aiming at the defects of the prior art and utilizing the principle of water temperature to change the solubility of oil in water.
The technical scheme for solving the technical problems is as follows: a method for removing oil by utilizing cold air floatation comprises the following steps:
(1) introducing air or compressed air into refrigeration equipment, and dividing cold air prepared by the refrigeration equipment into two paths, wherein the first path of cold air is led to a dissolved air-water generator containing production water, and the second path of cold air is led to an air flotation tank through a micro-bubble generator;
(2) the production water is separated out dissolved oil under the action of a first path of cold air, and the first path of cold air is dissolved into the production water under high pressure and is released into the air flotation tank through a pressure reducing valve;
(3) the second path of cold air generates low-temperature micro-bubbles in the micro-bubble generator, and the low-temperature micro-bubbles enter the air floating tank and further separate out dissolved oil in the production water;
dissolved oil adhered with micro bubbles rises and is discharged through the air flotation tank; the treated production water is discharged from the lower part of the air flotation tank and enters the next stage of working procedure.
The production water refers to production associated water containing oils and other impurities after oil-gas separation in an oil-gas field.
The invention is further set up in step (2), after adding a certain amount of chemical agent, release to the air flotation tank through the relief valve; then, in the step (3), the dissolved oil is flocculated by the chemical agent while the dissolved oil adhering microbubbles rise.
The invention is further set up in that the inlet pressure of the refrigerating equipment is 0.6-1Mpa, and the air quantity is 2-4m3/min。
The invention is further set that the first path of cold air accounts for 30-50% of the total air volume, and the second path of cold air accounts for 50-70% of the total air volume.
The invention is further provided that the treatment capacity of the production water entering the air flotation tank is 30-200m3/h。
The invention is further set that the refrigerating device is a vortex tube, after air or compressed air is refrigerated by the vortex tube, the temperature of the hot end of the vortex tube is 30-90 ℃, the temperature of the cold end of the vortex tube is-50-10 ℃, and refrigerating gas is led into the dissolved gas-water generator and the microbubble generator through the outlet of the cold end of the vortex tube.
The invention is further arranged in that the refrigeration equipment is connected with an air cylinder, the air cylinder is vertical and is positioned in the air floatation tank, a plurality of vertically and uniformly distributed mounting holes are formed in the air cylinder, and the micro-bubble generator is fixed on the mounting holes; the air cylinder is connected with a spiral rotational flow guide vane, and the angle of the rotational flow guide vane is 10-45 degrees; and the water phase of the production water moves to the outer side of the rotational flow guide vane and the oil phase moves to the inner side of the rotational flow guide vane under the centrifugal force action of the rotational flow guide vane.
The invention also provides a device for removing oil by utilizing air flotation of cold air, which comprises refrigeration equipment, a dissolved air water generator and an air storage cylinder, wherein the dissolved air water generator and the air storage cylinder are respectively connected with the refrigeration equipment; the air cylinder is vertical and is located the air supporting jar, the upper portion intercommunication of air supporting jar dissolve gas water generator, open at the top of air supporting jar has the gaseous phase export, open on the upper portion of air supporting jar has the oil phase export, open at the bottom of air supporting jar has the production water export.
The invention is further provided that the dissolved air water generator is connected with a pressurizing device, and a pressure reducing valve is arranged on a pipeline connecting the dissolved air water generator and the air flotation tank. The common pressurizing device is a compressor, but the pressurizing device and the vortex tube are not the same compressor, the compressor connected with the vortex tube is used for adding air with pressure to the vortex tube, and the temperature of the air can be reduced by utilizing the internal structure of the vortex tube. The pressurizing equipment connected with the dissolved air water generator is used for pressurizing the inside, the water under high pressure can increase the solubility of the water to the air, and the water dissolving the air can separate out the air and become micro-bubbles after being released by the pressure reducing valve.
The invention is further arranged that the micro-bubble generator is connected with a rotational flow guide vane with an inclination angle of 10-45 degrees, and the width of the rotational flow guide vane is 0.1-0.2 times of the diameter of the air flotation tank.
The invention is further configured that the microbubble generator comprises a tank body and a cover body, the tank body and the cover body are detachably connected together, the cover body is provided with an air outlet, and an air outlet pipeline is connected between the air outlet and the mounting hole; the axis of microbubble generator is in the horizontal direction, the medial surface of the jar body is opened there is the through-hole, be fixed with on the through-hole and open the micro-nano membrane structure who has the micro-nanometer level gas pocket.
The invention is further provided that the diameter of the microbubble generator is 0.05-0.1 times of the diameter of the air flotation tank, and the height of the microbubble generator is 0.5-0.8 times of the height of the air flotation tank.
The invention is further configured that the pore size of the micro-nano pores is 10 μm to 100 μm.
Furthermore, round holes for connecting the micro-nano membrane structure are formed in the periphery of the micro-bubble generator, and the distance between the round holes is 60-120 mm.
The invention has the following beneficial effects:
(1) the method for removing oil by utilizing the air flotation of the cold air has the advantages that the solubility of oil in water is influenced by temperature, the cold air is divided into two paths for graded cooling, and the adverse effect of poor primary cooling effect is avoided.
(2) The device for removing oil by air flotation with cold air has the advantages that the micro bubble generators are vertically and uniformly distributed, the temperature can be fully and quickly reduced, meanwhile, the rotational flow guide vanes are used for combining the rotational flow with the air flotation, the air flotation efficiency is greatly increased, and the using amount of chemical agents is obviously reduced.
Drawings
FIG. 1 is a schematic flow chart of a cold air flotation degreasing method in an embodiment;
FIG. 2 is a schematic structural diagram of a cold air floatation oil removal device in an embodiment;
fig. 3 is a schematic view of a mounting structure of the microbubble generator in the embodiment;
fig. 4 is a schematic diagram of the inner side surface structure of the microbubble generator.
Wherein, 1, a compressor; 2. a vortex tube; 3. a dissolved air water generator; 4. an air flotation tank; 5. a microbubble generator; 51. a bolt; 52. a micro-nano membrane structure; 53. an air outlet pipe; 54. micro-nano pores; 6. an oil-rich zone; 7. a pressure gauge; 8. a flow meter; 9. a thermometer; 10. a chemical agent inlet; 11. a production water inlet; 12. a gas phase outlet; 13. an oil phase outlet; 14. a production water outlet; 15. a swirl guide vane; 16. a pressure reducing valve; 17. an air cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and fig. 2, the cold air flotation oil removing method of the present embodiment includes the following steps:
leading air or compressed air compressed by a compressor 1 into refrigeration equipment (a vortex tube 2 is used here), and dividing cold air prepared by the refrigeration equipment into two paths, wherein the first path of cold air is led to a dissolved air-water generator 3 containing production water, and the second path of cold air is led to an air flotation tank 4 through a micro-bubble generator 5; the production water enters the dissolved gas water generator 3 through the production water inlet 11.
The produced water is separated out dissolved oil under the action of a first path of cold air, the first path of cold air is dissolved into the produced water under high pressure (the pressure is measured by a pressure gauge 7), and chemical agents (the concentration range can be changed within 0-100 mg/L) are added and released into the air flotation tank 4 through a pressure reducing valve 16; the chemical agent enters the dissolved air water generator 3 through the chemical agent inlet 10.
The second path of cold air generates low-temperature micro-bubbles in the micro-bubble generator 5, and the low-temperature micro-bubbles enter the air floating tank 4 to further separate out dissolved oil in the production water.
The dissolved oil is flocculated under the action of the chemical agent, adhered microbubbles (namely the low-temperature microbubbles with possibly changed temperature) rise to be gathered in the oil-rich area 6 and are discharged through an oil phase outlet 13 of the air flotation tank 4; the treated process water enters the next stage from the process water outlet 14. The treated gas phase is discharged through the gas phase outlet 12 of the gas flotation tank 4.
As a better use effect, the inlet pressure of the vortex tube is 0.6-1Mpa, and the air quantity is 2-4m3And/min. The first path of cold air accounts for 30-50% of the total air volume, and the second path of cold air accounts for 50-70% of the total air volume. The inlet speed of the production water through the air flotation tank 4 is 0.5-5 m/s.
Furthermore, a rotational flow guide vane 15 with an angle of 10-45 degrees is arranged in the air floating tank 4; the water phase of the produced water moves to the outer side of the cyclone guide vane 15 and the oil phase moves to the inner side of the cyclone guide vane 15 under the centrifugal force of the cyclone guide vane 15, so that the oil-water separation is accelerated.
The pipeline of the cold air floatation oil removal device is provided with a flowmeter 8 and a thermometer 9.
Example 2
As shown in fig. 1 and fig. 2, the cold air-flotation oil removing device of the present embodiment includes a refrigeration device, a dissolved air-water generator 3 and an air cylinder 17 (top sealed, bottom connected with a pipeline) respectively connected with the refrigeration device, wherein the air cylinder 17 is provided with a plurality of vertically and uniformly distributed mounting holes, and micro-bubble generators 5 are fixed on the mounting holes; the air cylinder 17 is vertical and is positioned in the air floating tank 4, the upper part of the air floating tank 4 is communicated with the dissolved air-water generator 3, the top of the air floating tank 4 is provided with a gas phase outlet 12, the upper part of the air floating tank 4 is provided with an oil phase outlet 13, and the bottom of the air floating tank 4 is provided with a production water outlet 14.
Further, the dissolved air water generator 3 is connected with a pressurizing device, and a pressure reducing valve 16 is arranged on a pipeline connecting the dissolved air water generator 3 and the air floatation tank 4. The micro-bubble generator 5 is connected with a rotational flow guide sheet 15 with an inclination angle of 10-45 degrees, and the width of the rotational flow guide sheet 15 is 0.1-0.2 times of the diameter of the air flotation tank 4.
In addition, referring to fig. 3 and 4, the microbubble generator 5 comprises a tank body and a cover body, the tank body and the cover body are detachably connected together through fixing parts such as bolts 51, the cover body is provided with air outlet holes, and an air outlet pipeline 53 is connected between the air outlet holes and the mounting holes; the central axis of the micro-bubble generator 5 is in the horizontal direction, the inner side surface of the tank body is provided with a through hole, and a micro-nano membrane structure 52 provided with micro-nano pores 54 is fixed on the through hole. The diameter of the micro-bubble generator 5 can be 0.05 to 0.1 time of the diameter of the air flotation tank 4, and the height is 0.5 to 0.8 time of the height of the air flotation tank 4; round holes for connecting the micro-nano membrane structure 52 are formed around the micro-bubble generator 5, and the distance between the round holes is 60-120 mm.
For example, in a petrochemical enterprise, the original oil content of the produced water to be treated is about 5000mg/L, and after gravity settling, the oil content is reduced to about 2000mg/L at a temperature of 70-80 ℃. Then, the treatment of the production water was performed based on the air flotation degreasing method of example 1 and the air flotation degreasing apparatus of example 2, wherein the amount of the chemical agent used in the air flotation was 100mg/L, and the treatment time was 30 min.
The walnut shell filter is an existing device, walnut shells are crushed into millimeter-sized pieces and are filled, and the walnut shell filter is a next treatment device for treated production water to enter. One pipeline is arranged in series with a multi-media filter (pipeline 1) for the hydrocyclone in the prior art, the other pipeline is arranged in series with the multi-media filter (pipeline 2) for the device in the embodiment, and the produced water effects after treatment of the two pipelines are compared, and the method comprises the following steps:
line 1:
(1) from the pretreated process water to the hydrocyclone, the feed flow is 30m3The overflow ratio is 10%, and the chemical agent is added in an amount of 100 mg/L. (hydrocyclone is a common apparatus used for removing oil from water, where the process water enters from the inlet, undergoes a swirling action, the oil phase is removed from the overflow, and the water phase is removed from the underflow)
(2) The produced water treated by the hydrocyclone is led to a walnut shell filter.
Line 2:
(1) the production water after the gravity settling pretreatment is led to the device of the embodiment, and the liquid inlet quantity of the dissolved gas water generator 3 is 30m3A chemical agent of 50mg/L。
(2) The device sets the air inlet pressure of the vortex tube to be 0.7MPa and the air volume to be 2m3Min, initial temperature 20 ℃. The amount of cold air led to the dissolved air water generator 3 is 0.6m3Min, the amount of cold air introduced into the bottom of the air flotation tank 4 is 1.4m3/min。
(3) Treating in air floating tank 4 for 30min, and filtering with walnut shell filter.
And (4) analyzing results:
the initial oil content of the produced water is 5000mg/L, and after the produced water is treated by the pipeline 1 and the pipeline 2, the oil content is shown in the following table:
therefore, the device of the embodiment can greatly reduce the dosage of chemical agents, has good oil removing effect, can reach the standard that the content of export oil required by enterprises is 20mg/L, and is energy-saving and environment-friendly.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (13)
1. A method for removing oil by utilizing cold air floatation is characterized by comprising the following steps:
(1) introducing air or compressed air into refrigeration equipment, and dividing cold air prepared by the refrigeration equipment into two paths, wherein the first path of cold air is led to a dissolved air-water generator containing production water, and the second path of cold air is led to an air flotation tank through a micro-bubble generator;
(2) the production water is separated out dissolved oil under the action of a first path of cold air, and the first path of cold air is dissolved into the production water under high pressure and is released into the air flotation tank through a pressure reducing valve;
(3) the second path of cold air generates low-temperature micro-bubbles in the micro-bubble generator, and the low-temperature micro-bubbles enter the air floating tank and further separate out dissolved oil in the production water;
dissolved oil adhered with micro bubbles rises and is discharged through the air flotation tank; the treated production water is discharged from the lower part of the air flotation tank and enters the next stage of working procedure.
2. The method of claim 1, wherein in step (2), a chemical agent is added and then released into the air-bearing tank through a pressure reducing valve; then, in the step (3), the dissolved oil is flocculated by the chemical agent while the dissolved oil adhering microbubbles rise.
3. The method of claim 1, wherein the inlet pressure of the refrigeration equipment is 0.6-1Mpa, and the air volume is 2-4m3/min。
4. The method for removing oil by utilizing cold air flotation according to claim 1, wherein the first path of cold air is 30-50% of the total air volume, and the second path of cold air is 50-70% of the total air volume.
5. The method of claim 1, wherein the treatment capacity of the produced water entering the air flotation tank is 30-200m3/h。
6. The method as claimed in claim 1, wherein the refrigeration device is a vortex tube, the temperature of the hot end of the vortex tube is 30-90 ℃ and the temperature of the cold end of the vortex tube is-50-10 ℃ after air or compressed air is refrigerated by the vortex tube, and the refrigerated gas is introduced into the dissolved gas-water generator and the micro-bubble generator through the outlet of the cold end of the vortex tube.
7. The method for removing oil by using cold air flotation of claim 1, wherein the refrigeration equipment is connected to an air cylinder, the air cylinder is vertical and is located in the air flotation tank, a plurality of vertically and uniformly distributed mounting holes are formed in the air cylinder, and the microbubble generator is fixed to the mounting holes; the air cylinder is connected with a spiral rotational flow guide vane, and the angle of the rotational flow guide vane is 10-45 degrees; and the water phase of the production water moves to the outer side of the rotational flow guide vane and the oil phase moves to the inner side of the rotational flow guide vane under the centrifugal force action of the rotational flow guide vane.
8. A device for removing oil by utilizing air flotation of cold air is characterized by comprising refrigeration equipment, a dissolved air water generator and an air storage cylinder, wherein the dissolved air water generator and the air storage cylinder are respectively connected with the refrigeration equipment; the air cylinder is vertical and is located the air supporting jar, the upper portion intercommunication of air supporting jar dissolve gas water generator, open at the top of air supporting jar has the gaseous phase export, open on the upper portion of air supporting jar has the oil phase export, open at the bottom of air supporting jar has the production water export.
9. An apparatus as claimed in claim 8, wherein said dissolved air water generator is connected to a pressurizing device, and a pressure reducing valve is provided on a line connecting said dissolved air water generator and said air-float tank.
10. The apparatus of claim 8, wherein the microbubble generator is connected to a swirl vane having an inclination angle of 10-45 °, and the width of the swirl vane is 0.1-0.2 times the diameter of the air floating tank.
11. The apparatus of claim 8, wherein the microbubble generator comprises a tank and a cover, the tank and the cover are detachably connected together, the cover is provided with an air outlet, and an air outlet pipe is connected between the air outlet and the mounting hole; the axis of microbubble generator is in the horizontal direction, the medial surface of the jar body is opened there is the through-hole, be fixed with on the through-hole and open the micro-nano membrane structure who has the micro-nanometer level gas pocket.
12. The apparatus of claim 11, wherein the diameter of the microbubble generator is 0.05-0.1 times the diameter of the air flotation tank, and the height of the microbubble generator is 0.5-0.8 times the height of the air flotation tank.
13. The apparatus of claim 11, wherein the micro-nano pores have a diameter of 10 μm to 100 μm.
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| CN202011221836.6A CN112357994A (en) | 2020-11-05 | 2020-11-05 | Method and device for removing oil by air floatation with cold air |
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| CN113526791A (en) * | 2021-07-23 | 2021-10-22 | 上海中器环保科技有限公司 | Treatment device and method for biodiesel production wastewater |
| CN115124095A (en) * | 2021-03-29 | 2022-09-30 | 宝山钢铁股份有限公司 | High-efficiency treatment method of strong-base concentrated oil degreasing waste liquid |
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Application publication date: 20210212 |