CN110433571B - Pipeline type oil-gas-water separation and sewage treatment device and application method thereof - Google Patents
Pipeline type oil-gas-water separation and sewage treatment device and application method thereof Download PDFInfo
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- CN110433571B CN110433571B CN201910645217.0A CN201910645217A CN110433571B CN 110433571 B CN110433571 B CN 110433571B CN 201910645217 A CN201910645217 A CN 201910645217A CN 110433571 B CN110433571 B CN 110433571B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Abstract
The embodiment of the invention discloses a pipeline type oil-gas-water separation and sewage treatment device, which comprises a sewage treatment device, wherein the sewage treatment device is connected with a separation device for separating sewage mixed with oil and waste gas through a pipeline, and an oil-water lower outlet valve for regulating the flow of the sewage entering the sewage treatment device is arranged between the sewage treatment device and the separation device; the method comprises the steps of introducing the oil-gas-water mixed liquid into the separation device, then sampling in real time to obtain the volume liquid content in the separation device, introducing the mixed liquid into the sewage treatment device for treatment after the requirement is met, and finally discharging the mixed liquid.
Description
Technical Field
The embodiment of the invention relates to the field of oil-gas resource exploitation, in particular to a pipeline type oil-gas-water separation and sewage treatment device and an application method thereof.
Background
In the fields of oil gas resource exploitation and the like, an oil-gas-water multiphase separation and sewage treatment system is an indispensable production device, so that produced liquid of a production well is separated into oil phase, gas phase and water phase which reach the standard, the oil phase, the gas phase and the water phase are respectively transported and sold, and the water phase is reinjected or discharged. At present, the exploitation amount of land and offshore oil and gas fields is greatly increased, along with the continuation of exploitation, the water content of an oil well is higher and higher, and a large amount of gas is often accompanied, so that great pressure is brought to the existing oil-gas-water separation technology and system, the defects of the traditional separation technology are gradually shown, and the development of the offshore oil and gas exploitation technology is influenced. Therefore, the development of a novel efficient compact separator improves the indexes and efficiency of oil-gas-water separation and sewage treatment, reduces the load of an offshore platform, and has important significance on the development of offshore oil engineering.
The physical separation method in oil-gas-water multiphase separation and sewage treatment technology mainly includes gravity separation, centrifugal separation, floatation oil removal, electric dehydrator, filtration separation and the like. Patent No. CN102120103B entitled gas-oil-water three-phase separator discloses a device for realizing oil-gas-water three-phase separation mainly by adopting gravity separation technology. Patent No. CN201817338U entitled "oily sewage treatment machine" discloses a sewage treatment device composed of an inclined plate, a walnut shell filter and a parent reversible fiber ball filter. However, in the current production, a large amount of oil-gas-water mixed liquid and sewage are required to be rapidly separated, the gravity principle and the filtration technology are effective separation technical means, but the treatment speed is relatively slow, the equipment structure is complex, the volume is large, and the application of the equipment in the exploitation of ocean oil-gas resources is limited. Patent "combined type oil-water separation system" with grant publication number CN101810941B discloses a pipeline type oil-water separation system composed of a ladder type pipe and a rotational flow pipe, which has simple structure, rapid treatment and good effect on the separation of oil phase and water phase. Patent No. CN104707364B entitled oil-water separation device and method discloses a pipeline type oil-water separation device integrating centrifugation and gravity separation, which can realize rapid separation of oil-water mixed liquid. Patent No. CN105031977B entitled oil-gas-water multiphase separation system and application method thereof discloses a pipeline type oil-gas-water separation device and application method thereof, which can realize rapid separation of oil-gas-water mixed liquid, wherein the pipeline type oil-gas-water separation device comprises gas-liquid cyclone separation, oil-water cyclone coalescence and dynamic gravity separation.
However, when the oil-water separator is used, the auxiliary equipment is more, the manufacturing cost is higher, the resource consumption is more, the economic benefit is lower, the waste oil in the oil-water mixed liquid is difficult to efficiently remove when the oil, the gas and the water are separated, the purpose can be realized only by the user performing multiple operations with the aid of the auxiliary equipment or a filtering tool, and the operation is very complicated.
Disclosure of Invention
Therefore, the embodiment of the invention provides a pipeline type oil-gas-water separation and sewage treatment device and an application method thereof, and aims to solve the problems that in the prior art, when equipment is used, the auxiliary equipment is more, the manufacturing cost is higher, the resource consumption is more, the economic benefit is lower, and when oil-gas-water is separated, waste oil in oil-water mixed liquid is difficult to remove efficiently, a user needs to perform multiple operations by means of the auxiliary equipment or a filtering tool to achieve the purpose, and the operation is extremely complicated.
In order to achieve the above object, an embodiment of the present invention provides the following:
a pipeline type oil-gas-water separation and sewage treatment device comprises a sewage treatment device, wherein the sewage treatment device is connected with a separation device for separating sewage mixed with oil and waste gas through a pipeline, and an oil-water lower outlet valve for regulating the flow of the sewage entering the sewage treatment device is arranged between the sewage treatment device and the separation device;
the separation device comprises a gas-liquid separation device for separating gas from oil gas water, and the gas-liquid separation device is connected with an oil-water separation device for performing secondary separation on the oil gas water and discharging oil liquid.
As a preferable scheme of the present invention, the gas-liquid separation device includes an upper horizontal pipe, a lower horizontal pipe, and a plurality of inclined vertical pipes disposed between the upper horizontal pipe and the lower horizontal pipe, the lower horizontal pipe is provided with a through inlet at one end far away from the oil-water separation device, the lower horizontal pipe is provided with a flow guide device at one end close to the through inlet, two ends of the inclined vertical pipes are respectively connected with the upper horizontal pipe and the lower horizontal pipe in a sealing manner, and the upper horizontal pipe is provided with a gas-liquid separation upper outlet at one end close to the oil-water separation device.
As a preferable scheme of the present invention, the oil-water separation device includes an upper oil discharge pipe, a middle horizontal casing and a lower horizontal casing, wherein a first vertical riser is disposed between the middle horizontal casing and the lower horizontal casing, and a second vertical riser is disposed between the middle horizontal casing and the upper oil discharge pipe.
As a preferable scheme of the present invention, the sewage treatment apparatus includes a main pipeline, a diversion structure, and a rotation start section located in the main pipeline, the diversion structure is located in the main pipeline, a sewage inlet is provided at one end of the main pipeline close to the diversion structure, a conical separation hood is provided at one end of the main pipeline far from the diversion structure, a return outlet is provided at one end of the conical separation hood far from the main pipeline, and the rotation start section is located between the conical separation hood and the diversion structure.
As a preferable scheme of the invention, the conical separation cover comprises a conical inner pipeline and a separation outer pipeline positioned outside the conical inner pipeline, a plurality of separation holes are formed in the side wall of the conical inner pipeline at equal intervals, and a sewage discharge port is formed in the side surface of the separation outer pipeline.
In a preferred embodiment of the present invention, the inner diameter of the inclined vertical pipe is the same as that of the upper horizontal pipe.
In a preferred embodiment of the present invention, the diameter of the lower horizontal pipe is the same as that of the middle inner pipeline, and the lower horizontal pipe is hermetically connected with the middle inner pipeline.
As a preferable scheme of the invention, the upper oil discharge pipe is connected with the middle and outer sleeves through a second vertical riser, and an oil-water upper outlet is arranged at one end of the upper oil discharge pipe far away from the inclined riser.
As a preferred scheme of the present invention, the middle horizontal casing includes a middle outer casing and a middle inner pipe located in the middle outer casing and having two ends hermetically connected to the middle outer casing, the two ends of the middle inner pipe are respectively provided with an oil-water inlet and a middle outlet, the bottom of the middle inner pipe is provided with a plurality of rectangular slits, the lower horizontal casing includes a lower inner pipe and a lower outer pipe located outside the lower inner pipe and hermetically connected to the lower inner pipe, the lower outer pipe is connected to the middle outer casing through a first vertical riser, one end of the lower inner pipe is provided with an oil-water lower outlet, the other end of the inner pipe is sealed by a blind plate, and the bottom of the inner pipe is provided with a plurality of rectangular slits.
An application method of a pipeline type oil-gas-water separation and sewage treatment device comprises the following steps:
s100, introducing the oil-gas-water mixed liquid into a separation device, then sampling in real time to obtain the volume liquid content in the gas-liquid separation device, then adjusting a valve at an upper outlet of the gas-liquid separation device to reduce the volume liquid content to a preset value of 0.5%, discharging waste gas through the upper outlet of the gas-liquid separation device, and simultaneously enabling the mixed liquid to enter an oil-water separation device;
s200, opening a valve on the sewage treatment device, sampling in real time to obtain the volume water content in an outlet pipeline in the middle of the oil-water separation device, adjusting an adjusting valve at the outlet in the middle of the oil-water separation device and an adjusting valve arranged on a lower outlet pipeline to reduce the volume water content in the mixed liquid to a preset value of 1.0%, then opening a valve at the outlet on the oil-water separation device, sampling in real time to obtain the volume water content in the outlet pipeline on the oil-water separation device, adjusting a valve on the upper outlet pipeline to reduce the volume water content in the mixed liquid to a preset value of 1.0%, discharging waste oil from the outlet on the oil-water separation device and the outlet in the middle of the oil-water separation device, and simultaneously enabling the mixed liquid to;
s300, sampling in real time to obtain the oil content of the mixed liquid at the tangential outlet of the sewage treatment device, and simultaneously adjusting an adjusting valve at the axial outlet and an adjusting valve at the tangential outlet of the sewage treatment device, so that the sewage with higher oil content flows into the separation device again through the axial outlet of the sewage treatment device, and after the oil content of the mixed liquid at the axial outlet of the sewage treatment device is reduced to be within 30mg/L, discharging the water through the tangential outlet of the sewage treatment device.
The embodiment of the invention has the following advantages:
the equipment adopts a pipeline type separation technology, can realize automatic control separation of produced liquid in a production well, ensures that the liquid content in separated gas is less than 0.5 percent, the water content in oil is less than 1.0 percent, and the oil content in water is less than 30mg/L, has higher separation efficiency, small floor area of the equipment, lower manufacturing cost and higher economic benefit, and can send water with higher oil content into a separation device from a backflow outlet through a rotation starting section for secondary separation when oil-water separation is carried out.
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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side cross-sectional view of a lower horizontal pipe of the present invention;
FIG. 3 is a side sectional view of the oil-water separator of the present invention;
FIG. 4 is a side cross-sectional view of a tapered separation hood of the present invention.
In the figure:
1-an access port; 2-a flow guide device; 3-lower horizontal pipe; 4-tilting the riser; 5-upper horizontal pipe; 6-gas-liquid separation upper outlet; 7-oil water inlet; 8-rectangular seam; 9-middle inner pipe; 10-a first vertical riser; 11-middle and outer sleeve; 12-a second vertical riser; 13-upper oil drain pipe; 14-oil water upper outlet; 15-intermediate outlet; 16-lower inner pipe; 17-rectangular gaps; 18-lower outer tubing; 19-oil water outlet; 20-a sewage inlet; 21-a flow guide structure; 22-a start-up section; 23-a tapered inner conduit; 24-a separation well; 25-separating the outer tubing; 26-a sewage discharge port; 27-a reflux outlet; 28-gas outlet regulating valve; 29-oil water upper regulating valve; 30-adjusting valve in oil and water; 31-oil lower outlet valve; 32-axial outlet regulating valve; 33-tangential outlet regulating valve; 34-a gas-liquid separation device; 35-an oil-water separation device; 36-a sewage treatment plant; 37-a separation device; 38-middle horizontal sleeve; 39-lower horizontal casing; 40-a conical separation hood; 41-main body pipe.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
As shown in fig. 1, the present invention provides a pipeline type oil-gas-water separation and sewage treatment apparatus, comprising a sewage treatment apparatus 36, wherein the sewage treatment apparatus 36 is connected with a separation apparatus 37 for separating sewage mixed with oil and waste gas through a pipeline, and an oil-water outlet valve 31 for adjusting the flow rate of sewage entering the sewage treatment apparatus 36 is arranged between the sewage treatment apparatus 36 and the separation apparatus 37.
The separation device 37 comprises a gas-liquid separation device 34 for separating gas from oil, gas and water, and the gas-liquid separation device 34 is connected with an oil-water separation device 35 for performing secondary separation on oil, gas and water and discharging oil.
When the oil-gas-water separation and sewage treatment device is used, water is directly introduced into the gas-liquid separation device 34 from the inlet 1, and the lower horizontal pipe 3 is hermetically connected with the middle inner pipeline 9, so that after the water is introduced into the gas-liquid separation device 34, gas gradually enters the upper horizontal pipe 5 and is discharged through the gas-liquid separation upper outlet 6, then oil-water mixed liquid is subjected to secondary separation on oil-gas-water through the oil-water separation device 35 and oil liquid is discharged, then the separated mixed liquid is conveyed to the sewage treatment device 36, and after treatment, sewage can be discharged through the sewage discharge port 26, compared with the traditional equipment, the device can realize automatic control separation on produced liquid in a production well, so that the separated gas-water content is less than 0.5%, the oil-water content is less than 1.0%, the water-oil content in water is less than 30mg/L, and the separation efficiency is higher, and the equipment has small floor area, lower manufacturing cost and higher economic benefit.
As shown in fig. 1 and 2, the gas-liquid separation device 34 includes an upper horizontal pipe 5, a lower horizontal pipe 3, and a plurality of inclined vertical pipes 4 disposed between the upper horizontal pipe 5 and the lower horizontal pipe 3, the lower horizontal pipe 3 is provided with an inlet 1 at one end far from the oil-water separation device 35, the lower horizontal pipe 3 is provided with a flow guide device 2 at one end near the inlet 1, the flow guide device 2 can make sewage more convenient and quicker when passing through the inlet 1, two ends of the inclined vertical pipe 4 are respectively connected with the upper horizontal pipe 5 and the lower horizontal pipe 3 in a sealing manner, one end of the upper horizontal pipe 5 is connected with one inclined vertical pipe 4 in a sealing manner, so that the exhaust gas can rise into the upper horizontal pipe 5, and one end of the upper horizontal pipe 5 near the oil-water separation device 35 is provided with a gas-liquid separation upper outlet 6.
The gas-liquid separation device 34 is an inclined reducing multi-bifurcation pipeline, the separation of gas phase and liquid phase is realized by the principle of dynamic gravity separation, when in operation, the mixed liquid of oil, gas and water firstly enters the gas-liquid separation device 34 from the inlet 1, the mixed liquid generates stratification under the action of gravity in the process of flowing in the lower horizontal pipe 3 of the gas-liquid separation device 34, the liquid with higher density is gathered towards the bottom of the pipeline, the gas with lower density is gathered towards the top of the pipeline and flows to the upper horizontal pipe 5 along each inclined vertical pipe 4, meanwhile, the gas phase can carry the liquid in the upper horizontal pipe 5 to flow in the process of flowing upwards along the inclined vertical pipes 4, under the action of gravity, the liquid can flow back to the lower horizontal pipe 3 along the inclined vertical pipes 4, finally the separated gas phase flows out from the gas-liquid separation upper outlet 6, the liquid phase flows out from the oil-water inlet 7 and enters the oil-water separation device 35 to complete, in order to prevent the waste gas from containing too much water during the discharge of the waste gas, the gas outlet regulating valve 28 is arranged on the gas-liquid separation upper outlet 6, a user can sample and detect the gas discharged from the gas-liquid separation upper outlet 6, the gas outlet regulating valve 28 is completely opened after the volume liquid content of the gas is detected to be reduced to a preset value of 0.5%, and meanwhile, the oil-water mixed liquid is introduced into the oil-water separation device 35 for oil-water separation.
As shown in fig. 1 and 3, the oil-water separation device 35 includes an upper oil discharge pipe 13, a middle horizontal casing 38, and a lower horizontal casing 39, wherein a first vertical riser 10 is disposed between the middle horizontal casing 38 and the lower horizontal casing 39, and a second vertical riser 12 is disposed between the middle horizontal casing 38 and the upper oil discharge pipe 13.
The oil-water separating device 35 separates two phases of oil and water by the principle of dynamic gravity and shallow pool theory, when in use, once the oil-water mixed liquid passes through the lower horizontal pipe 3, the oil-water mixed liquid firstly passes through the middle horizontal pipe 38, and then flows into the lower horizontal pipe 39 through the first vertical pipe 10, and at the moment, a user can pump out waste liquid in the mixed liquid through the upper oil discharging pipe 13 and the middle internal pipe 9.
As shown in fig. 1 and 4, the sewage treatment device 36 includes a main pipe 41, a diversion structure 21, and a rotation-starting section 22 located in the main pipe 41, the diversion structure 21 is a multi-vane type and is fixedly installed inside the main pipe of the sewage treatment device 36, so that sewage can enter more quickly without causing a blockage situation, the diversion structure 21 is located in the main pipe 41, the main pipe 41 is provided with a sewage inlet 20 at an end close to the diversion structure 21, the main pipe 41 is provided with a conical separation cover 40 at an end far from the diversion structure 21, the conical separation cover 40 is provided with a return outlet 27 at an end far from the main pipe 41, and the rotation-starting section 22 is located between the conical separation cover 40 and the diversion structure 21.
The sewage treatment device 36 is an axial rotation type centrifugal separation device, sewage is treated by the principle of centrifugal separation, when the device is used, water-containing sewage flows into the sewage treatment device 36 from an oil-water outlet 19 of the oil-water separation device 35, and centrifugal separation is carried out under the action of a high-strength rotational flow field; in the sewage treatment process, firstly, sewage enters from the sewage inlet 20 of the sewage treatment device 36, and a high-strength rotational flow field is formed in the swirling section 22 under the action of the flow guide structure 21, and due to the density difference, the oil phase with low density gradually gathers towards the axis of the main pipeline 41, and the water phase with high density gradually moves towards the periphery of the pipeline; then, the oil phase gathered at the core of the pipeline flows through the conical inner pipeline 23 and continues to flow forwards, flows out from the backflow outlet 27 of the sewage treatment device 36, flows back to the gas-liquid separation device 34 for re-separation treatment, the water phase gathered at the periphery of the pipeline flows into the conical inner pipeline 23, enters the separation outer pipeline 25 of the conical section along the separation hole 24 which is axially opened, and finally flows out from the sewage discharge port 26 for outward discharge treatment, the conical separation cover 40 is of a sleeve structure, in order to enable the separation effect of the oil-water mixed liquid to be better, the axial outlet regulating valve 32 and the tangential outlet regulating valve 33 are respectively arranged on the backflow outlet 27 and the sewage discharge port 26, at this time, a user can firstly carry out sampling detection operation, the oil content of the mixed liquid in the axial outlet of the sewage treatment device 36 is reduced to be within 30mg/L, and then the axial outlet regulating valve 32 and the tangential outlet regulating valve 33, the water is discharged through the sewage discharge port 26, and part of the mixed liquid flows into the inlet port 1 through the return outlet port 27 again.
As shown in fig. 1 and 4, the conical separation cover 40 includes a conical inner pipe 23 and a separation outer pipe 25 located outside the conical inner pipe 23, a plurality of separation holes 24 are formed in a sidewall of the conical inner pipe 23 at equal intervals, a sewage discharge port 26 is formed in a side surface of the separation outer pipe 25, when the conical separation cover 40 is in operation, once the spinning section 22 is operated, oil and water are subjected to cyclone aggregation and then dynamic gravity separation, so that separated sewage is discharged through the sewage discharge port 26, and a part of mixed liquid with a high oil content flows into the inlet 1 through the return outlet 27 for re-separation.
The inner diameters of the inclined vertical pipe 4 and the upper horizontal pipe 5 are the same, so that the liquid can be partially attached to the inclined vertical pipe 4 when the gas rises and then drops from the inclined vertical pipe 4, if the inner diameter of the upper horizontal pipe 5 is larger, the water accumulation phenomenon of the upper horizontal pipe 5 is easily caused, so that the water content of the gas is higher, in the actual selection of the gas-liquid separation device 34, the inner diameters D2 of the inclined vertical pipe 4 and the upper horizontal pipe 5 are the same, and are generally 1/2 of the inner diameter D1 of the lower horizontal pipe 3, and the inner diameter D1 of the lower horizontal pipe 3 is calculated according to the flow Q of the inlet mixed liquid,
the inclination angle alpha of the inclined vertical pipes 4 in the gas-liquid separation device 34 is 30-60 degrees, the number n1 of the inclined vertical pipes (4) is 3-12, the distance L1 is 3-20 times of the inner diameter D1 of the lower horizontal pipe 3, and the inclination angle alpha is selected according to the flow Q and the volume gas content of an inlet.
The diameter values of the lower horizontal pipe 3 and the middle inner pipeline 9 are the same, so that water cannot be influenced by flow limitation when entering the middle inner pipeline 9, in the oil-water separation device 35, the middle horizontal sleeve 38 and the lower horizontal sleeve 39 are both in an eccentric design, and the separation effect of the shallow pool principle is enhanced; the inner diameter of an inner pipeline 9 in a lower horizontal casing pipe 39 is the same as the inner diameter D1 of a lower horizontal pipe 3, the distance between an upper part of an outer casing pipe 11 and the inner pipeline 9 is smaller than the distance between lower parts, the ratio is 1:3, the distance between the upper parts is 15-25 mm, rectangular slits 8 are formed in the bottom of the inner pipeline 9, the number n2 and the area A1 of the rectangular slits 8 are calculated according to the inner diameter of the inner pipeline 9 and the number n3 of first vertical pipes 10, n2 is 2 × n3, and A1 is 0.25 × pi D12/n 2. The design scheme of the inner diameter of the lower inner pipeline 16 in the lower horizontal casing 39 and the inner diameter of the rectangular gap 17 is the same as that of the middle inner pipeline 9 in the middle horizontal casing 38, the distance between the upper part of the lower outer pipeline 18 and the lower inner pipeline 16 is larger than that between the lower part of the lower outer pipeline 18 and the lower inner pipeline 16, the ratio is 3:1, and the distance between the lower parts of the lower outer pipeline 18 and the lower inner pipeline 16 is 15-; the middle and outer pipelines 11 and the lower and outer pipelines 18 are connected by adopting a plurality of first vertical stand pipes 10, the number n4 of the first vertical stand pipes 10 is 3-12, the distance L2 of the first vertical stand pipes 10 is 3-20 times of the inner diameter D1 of the middle and inner pipelines 9 in the middle layer horizontal sleeve 38, and the inner diameter D3 of the first vertical stand pipes 10 is 0.5-1 time of the inner diameter D1 of the middle and inner pipelines 9 in the middle layer horizontal sleeve 38; the inner diameter D4 of the upper oil discharge pipe 13 is 0.1-0.5 times of the inner diameter D1 of the middle inner pipeline 9 in the middle horizontal casing 38, the upper oil discharge pipe 13 is connected with the middle outer casing 11 of the middle horizontal casing 38 by adopting a plurality of second vertical stand pipes 12, the inner diameter of each second vertical stand pipe 12 is the same as the inner diameter D4 of the upper oil discharge pipe 13, and the number and the spacing of the second vertical stand pipes 12 are n4-1 and L2 respectively;
preferably, in the sewage treatment apparatus 36, the inner diameter D5 of the main pipe such as the revolving stage 22 is 0.25 to 0.5 times the inner diameter D1 of the lower horizontal pipe 3 in the gas-liquid separator 34, and the length 3 of the revolving stage 22 is 10 × D5; the installation angle beta of the flow guide structure 21 is 30 degrees; the length L4 of the conical separation cover 40 is 6X D5, the number of the separation holes 24 arranged on the periphery along the tangential direction is 36, and the inner diameter D6 of the separation holes 24 is D5/6; the internal diameter D7 of the return outlet 27 is 0.2 × D5; the inside diameter of the sewage discharge port 26 is D5.
As shown in fig. 1 and 3, the middle horizontal casing 38 includes a middle outer casing 11 and a middle inner pipe 9 located in the middle outer casing 11 and having two ends hermetically connected to the middle outer casing 11, the two ends of the middle inner pipe 9 are respectively provided with an oil-water inlet 7 and a middle outlet 15, the bottom of the middle inner pipe 9 is provided with a plurality of rectangular slits 8, the lower horizontal casing 39 includes a lower inner pipe 16 and a lower outer pipe 18 located outside the lower inner pipe 16 and hermetically connected to the lower inner pipe 16, the lower outer pipe 18 is connected to the middle outer casing 11 through a first vertical riser 10, one end of the lower inner pipe 16 is provided with an oil-water outlet 19, the other end of the lower inner pipe 16 is sealed by a blind plate, and the bottom of the lower inner pipe 16 is provided with a plurality of rectangular gaps 17.
When the oil-water separation device 35 is in specific operation, once an oil-water mixed solution enters the middle inner pipeline 9 of the oil-water separation device 35, oil-water two phases are layered under the action of gravity in the flowing process, a water phase with higher density is deposited at the bottom of the middle inner pipeline 9 and flows out from a rectangular seam 8 formed in the bottom of the middle inner pipeline 9 to enter the middle outer sleeve 11, and an oil phase with lower density flows forwards along the top of the middle inner pipeline 9 and finally flows out from a middle outlet 15 of the oil-water separation device 35; then the water phase entering the middle and outer casing 11 may carry a small amount of oil phase, further separation is carried out under the action of gravity and shallow pool principle, the separated oil phase enters the upper oil drain pipe 13 from the second vertical riser pipe 12, because the upper oil drain pipe 13 is connected with the middle and outer casing 11 through the second vertical riser pipe 12, and the upper oil discharge pipe 13 is provided with an oil-water upper outlet 14 at one end far away from the inclined vertical pipe 4, so that the waste oil entering the upper oil discharge pipe 13 can flow out through the oil-water upper outlet 14 of the oil-water separation device 35, the separated water phase enters the lower outer pipeline 18 along the first vertical pipe 10, and enters the lower inner pipeline 16 through a rectangular gap 17 formed at the bottom of the lower inner pipeline 16, and finally flows out from an oil-water lower outlet 19 of the oil-water separation device 35, so that the primary separation of oil and water phases is finally realized, and the oily sewage flowing out from the oil-water lower outlet 19 enters a sewage treatment device 36.
In the embodiment, in order to prevent the waste oil from containing a large amount of water during discharge, the oil-water upper regulating valve 29 and the oil-water middle regulating valve 30 are respectively arranged at the oil-water upper outlet 14 and the middle outlet 15, so that a user can sample in real time to obtain whether the volume water content in the mixed liquid is reduced to a preset value of 1.0%, and if so, the corresponding regulating valves are opened to discharge the oil.
The parameters of each structure of the pipeline type oil-gas-water separation and sewage treatment device can be calculated and determined according to the volume percentage of each phase of oil-gas-water in the mixed incoming liquid and the mixed flow, and when the mixed flow of the oil-gas-water is 20-30 m3When mixed liquid with the volume gas content of less than 30% and the volume oil content of less than 40% in the liquid phase enters under the working condition,/h, the specific implementation size can be preferably as follows:
in the gas-liquid separation device 34, the inner diameter of the lower horizontal pipe 3 is 100mm, the inner diameters of the upper horizontal pipe 5 and the inclined vertical pipe 4 are both 50mm, the number of the inclined vertical pipes 4 is 4, the angle alpha is 60 degrees, and the distance is 300 mm; in the oil-water separation device 35, the inner diameter of the inner pipeline 9 is 100mm, the outer diameter is 110mm, the inner diameter of the middle outer casing 11 is 170mm, the upper distance between the middle outer casing 11 and the middle inner pipeline 9 is 15mm, the lower distance between the middle outer casing 11 and the middle inner pipeline 9 is 45mm, the bottom of the middle inner pipeline 9 is provided with 10 rectangular seams 8, and the size is 50mm 15.7 mm; in the oil-water separation device 35, the number of the first vertical stand pipes 10 is 5, the inner diameter is 100mm, the length is 150mm, and the distance between every two first vertical stand pipes 10 is 200 mm; meanwhile, the inner diameters of the upper oil discharging pipe 13 and the second vertical stand pipes 12 are both 15mm, the number of the second vertical stand pipes 12 is 4, the length of the second vertical stand pipes is 50mm, and the distance between every two second vertical stand pipes 12 is 200 mm; the inner diameter of the lower inner pipeline 16 is 100mm, the outer diameter is selected to be 110mm, the inner diameter of the outer pipe in the lower layer casing pipe is 170mm, the upper distance between the lower outer pipeline 18 and the lower inner pipeline 16 is 45mm, the lower distance is 15mm, the number of rectangular gaps 17 formed at the bottom of the lower inner pipeline 16 is 10, and the size is 50mm 15.7 mm; in the sewage treatment device 36, the inner diameter of the main pipelines such as the start-up section 22 is 50mm, the length of the start-up section 22 is 500mm, the installation angle beta of the diversion structure 21 is 30 degrees, the length of the conical separation cover 40 is 300mm, the number of the separation holes 24 is 36, the inner diameter of each separation hole 24 is 8.3mm, the inner diameter of the backflow outlet 27 is 10mm, the inner diameter of the sewage discharge port 26 is 50mm, and the inner diameter of the outer separation pipeline 25 is 70 mm.
An application method of a pipeline type oil-gas-water separation and sewage treatment device comprises the following steps:
s100, introducing the oil-gas-water mixed liquid into a separation device, then sampling in real time to obtain the volume liquid content in the gas-liquid separation device, then adjusting a valve at an upper outlet of the gas-liquid separation device to reduce the volume liquid content to a preset value of 0.5%, discharging waste gas through the upper outlet of the gas-liquid separation device, and simultaneously enabling the mixed liquid to enter an oil-water separation device.
Before the work begins, the air outlet regulating valve 28 and the oil-water middle regulating valve 30 need to be opened, the oil-water upper regulating valve 29 and the oil-water lower outlet valve 31, the axial outlet regulating valve 32 and the tangential outlet regulating valve 33 need to be closed, sampling is convenient, and the situation of liquid leakage cannot occur.
S200, opening a valve on the sewage treatment device, sampling in real time to obtain the volume water content in an outlet pipeline in the middle of the oil-water separation device, adjusting an adjusting valve at the outlet in the middle of the oil-water separation device and an adjusting valve arranged on a lower outlet pipeline to reduce the volume water content in the mixed liquid to a preset value of 1.0%, then opening a valve at the outlet on the oil-water separation device, sampling in real time to obtain the volume water content in the outlet pipeline on the oil-water separation device, adjusting a valve on the upper outlet pipeline to reduce the volume water content in the mixed liquid to a preset value of 1.0%, discharging waste oil from the outlet on the oil-water separation device and the outlet in the middle of the oil-water separation device, and simultaneously enabling the mixed liquid to;
s300, sampling in real time to obtain the oil content of the mixed liquid at the tangential outlet of the sewage treatment device, and simultaneously adjusting an adjusting valve at the axial outlet and an adjusting valve at the tangential outlet of the sewage treatment device, so that the sewage with higher oil content flows into the separation device again through the axial outlet of the sewage treatment device, and after the oil content of the mixed liquid at the axial outlet of the sewage treatment device is reduced to be within 30mg/L, discharging the water through the tangential outlet of the sewage treatment device.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. The pipeline type oil-gas-water separation and sewage treatment device is characterized by comprising a sewage treatment device (36), wherein the sewage treatment device (36) is connected with a separation device (37) for separating sewage mixed with oil and waste gas through a pipeline, and an oil-water lower outlet valve (31) for adjusting the flow of the sewage entering the sewage treatment device (36) is arranged between the sewage treatment device (36) and the separation device (37);
the separation device (37) comprises a gas-liquid separation device (34) for separating gas from oil, gas and water, and the gas-liquid separation device (34) is connected with an oil-water separation device (35) for performing secondary separation on the oil, gas and water and discharging oil;
the sewage treatment device (36) comprises a main pipeline (41), a flow guide structure (21) and a screwing section (22) positioned in the main pipeline (41), wherein the flow guide structure (21) is positioned in the main pipeline (41), one end of the main pipeline (41) close to the flow guide structure (21) is provided with a sewage inlet (20), one end of the main pipeline (41) far away from the flow guide structure (21) is provided with a conical separation cover (40), one end of the conical separation cover (40) far away from the main pipeline (41) is provided with a return outlet (27), the screwing section (22) is positioned between the conical separation cover (40) and the flow guide structure (21), the conical separation cover (40) comprises a conical inner pipeline (23) and a separation outer pipeline (25) positioned outside the conical inner pipeline (23), and a plurality of separation holes (24) are formed in the side wall of the conical inner pipeline (23) at equal intervals, a sewage discharge port (26) is formed in the side surface of the outer separation pipeline (25);
the oil-water separation device (35) comprises an upper oil discharge pipe (13), a middle-layer horizontal sleeve (38) and a lower-layer horizontal sleeve (39), a first vertical riser (10) is arranged between the middle-layer horizontal sleeve (38) and the lower-layer horizontal sleeve (39), and a second vertical riser (12) is arranged between the middle-layer horizontal sleeve (38) and the upper oil discharge pipe (13);
the middle-layer horizontal sleeve (38) comprises a middle outer sleeve (11) and a middle inner pipeline (9) which is positioned in the middle outer sleeve (11) and both ends of which are hermetically connected with the middle outer sleeve (11), an oil-water inlet (7) and an intermediate outlet (15) are respectively arranged at two ends of the middle inner pipeline (9), and the bottom of the middle inner pipeline (9) is provided with a plurality of rectangular slits (8), the lower layer horizontal casing pipe (39) comprises a lower inner pipeline (16) and a lower outer pipeline (18) which is positioned outside the lower inner pipeline (16) and is connected with the lower inner pipeline (16) in a sealing way, the lower outer pipeline (18) is connected with the middle outer casing pipe (11) through a first vertical riser pipe (10), one end of the lower inner pipeline (16) is provided with an oil-water lower outlet (19), the other end of the lower inner pipeline (16) is sealed by a blind plate, and a plurality of rectangular gaps (17) are arranged at the bottom of the lower inner pipeline (16).
2. The pipeline type oil-gas-water separation and sewage treatment device according to claim 1, wherein the gas-liquid separation device (34) comprises an upper horizontal pipe (5), a lower horizontal pipe (3) and a plurality of inclined vertical pipes (4) arranged between the upper horizontal pipe (5) and the lower horizontal pipe (3), the lower horizontal pipe (3) is provided with an inlet (1) at one end far away from the oil-water separation device (35), the lower horizontal pipe (3) is provided with a flow guide device (2) at one end close to the inlet (1), two ends of each inclined vertical pipe (4) are respectively connected with the upper horizontal pipe (5) and the lower horizontal pipe (3) in a sealing manner, and the upper horizontal pipe (5) is provided with a gas-liquid separation upper outlet (6) at one end close to the oil-water separation device (35).
3. A ducted oil-gas-water separation and sewage treatment plant according to claim 2, characterized in that the inclined riser (4) and the upper horizontal pipe (5) have the same inner diameter value.
4. A ducted oil-gas-water separation and sewage treatment plant according to claim 2, characterized in that the diameter of the lower horizontal pipe (3) and the middle inner pipe (9) are of the same value and the lower horizontal pipe (3) and the middle inner pipe (9) are sealingly connected.
5. The pipeline type oil-gas-water separation and sewage treatment device as claimed in claim 1, wherein the upper oil discharge pipe (13) is connected with the middle and outer casing pipes (11) through a second vertical riser (12), and an oil water outlet (14) is arranged at one end of the upper oil discharge pipe (13) far away from the inclined riser (4).
6. The application method of the pipeline type oil-gas-water separation and sewage treatment device according to any one of claims 1 to 5, which is characterized by comprising the following steps:
s100, introducing the oil-gas-water mixed liquid into a separation device, then sampling in real time to obtain the volume liquid content in the gas-liquid separation device, then adjusting a valve at an upper outlet of the gas-liquid separation device to reduce the volume liquid content to a preset value of 0.5%, discharging waste gas through the upper outlet of the gas-liquid separation device, and simultaneously enabling the mixed liquid to enter an oil-water separation device;
s200, opening a valve on the sewage treatment device, sampling in real time to obtain the volume water content in an outlet pipeline in the middle of the oil-water separation device, adjusting an adjusting valve at the outlet in the middle of the oil-water separation device and an adjusting valve arranged on a lower outlet pipeline to reduce the volume water content in the mixed liquid to a preset value of 1.0%, then opening a valve at the outlet on the oil-water separation device, sampling in real time to obtain the volume water content in the outlet pipeline on the oil-water separation device, adjusting a valve on the upper outlet pipeline to reduce the volume water content in the mixed liquid to a preset value of 1.0%, discharging waste oil from the outlet on the oil-water separation device and the outlet in the middle of the oil-water separation device, and simultaneously enabling the mixed liquid to;
s300, sampling in real time to obtain the oil content of the mixed liquid at the tangential outlet of the sewage treatment device, and simultaneously adjusting an adjusting valve at the axial outlet and an adjusting valve at the tangential outlet of the sewage treatment device, so that the sewage with higher oil content flows into the separation device again through the axial outlet of the sewage treatment device, and after the oil content of the mixed liquid at the axial outlet of the sewage treatment device is reduced to be within 30mg/L, discharging the water through the tangential outlet of the sewage treatment device.
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| CN113526614B (en) * | 2021-07-09 | 2022-04-12 | 中国科学院力学研究所 | Pipeline air-entrapping cyclone coalescence-separation device and method for treating oily sewage |
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Effective date of registration: 20220919 Address after: 100190, No. 15 West Fourth Ring Road, Beijing, Haidian District Patentee after: INSTITUTE OF MECHANICS, CHINESE ACADEMY OF SCIENCES Patentee after: Guangdong Aerospace Science and Technology Research Institute Address before: 100190, No. 15 West Fourth Ring Road, Beijing, Haidian District Patentee before: INSTITUTE OF MECHANICS, CHINESE ACADEMY OF SCIENCES |