CN212655582U - A skid-mounted multi-stage series oil-water separation system - Google Patents
A skid-mounted multi-stage series oil-water separation system Download PDFInfo
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- CN212655582U CN212655582U CN202020431951.5U CN202020431951U CN212655582U CN 212655582 U CN212655582 U CN 212655582U CN 202020431951 U CN202020431951 U CN 202020431951U CN 212655582 U CN212655582 U CN 212655582U
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Abstract
本实用新型属于污水处理技术领域，尤其是涉及一种油水分离设备及方法。一种撬装式多级串联油水分离系统，主要由污水预处理装置、旋流分离装置、聚结沉降装置、过滤装置通过泵和管依次串联连接组成，根据污水处理过程中不同阶段含油粒度的特性，采用相应装置进行分级处理。本实用新型基于对油田污水的粒径分析，采用串联分级处理方式，根据不同阶段污水含油粒度，采用污水预处理、水力旋流、聚结板沉降、过滤等方法进行分级处理，提高油水分离效率，达到油田回注水标准；并进行撬装集成，适应小区块田、边缘油田、海上平台的含油污水处理要求，降低油水分离系统的运行成本。
The utility model belongs to the technical field of sewage treatment, in particular to an oil-water separation device and a method. A skid-mounted multi-stage series oil-water separation system is mainly composed of a sewage pretreatment device, a cyclone separation device, a coalescing settling device, and a filtering device connected in series through pumps and pipes. characteristics, and the corresponding device is used for grading treatment. Based on the particle size analysis of oilfield sewage, the utility model adopts a series classification treatment method, and according to the oil-containing particle size of the sewage at different stages, the sewage pretreatment, hydrocyclone, coalescing plate settling, filtration and other methods are used for classification treatment, so as to improve the oil-water separation efficiency. , reaching the oilfield reinjection water standard; and skid-mounted integration to meet the oily sewage treatment requirements of small block fields, marginal oilfields, and offshore platforms, and reduce the operating cost of oil-water separation systems.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, especially, relate to an oil-water separation equipment.
Background
At present, most oil fields in China enter the later stage of high water content development, and under the condition that special oil and gas reservoirs such as marginal oil fields and offshore oil fields become main oil and gas exploitation blocks, oily sewage treatment faces three problems: 1) the great increase of the oil-containing sewage amount prompts the continuous reconstruction and expansion of the original sewage treatment facilities, but the current sewage treatment system of the domestic large-scale oil field united station generally adopts two-stage gravity settling and two-stage filtering processes, and the treatment equipment has low efficiency, large volume and high investment; 2) for the main oil field edge and the offshore oil field, the development period is relatively short, the collected liquid can increase the burden of gathering and transportation and sewage treatment if the collected liquid is transported to a united station by transportation equipment for treatment, if a fixed sewage treatment device is built, the cost is high, the occupied area is large, the equipment is scrapped after the oil field is transferred, and the operation is not economical; 3) because the small oil fields developed by the main oil field edge rolling are mostly in need of reinjection with clear water due to high water injection difficulty, the requirement on the sewage purification degree is high.
The oil field sewage has large oil content, and if the sewage is unreasonably treated and utilized and is randomly discharged, serious consequences are brought, water and crude oil are wasted, the environment is seriously polluted, and the safety production of the oil field is influenced. And the oil field sewage is a complex multiphase system containing solid impurities, liquid impurities, dissolved gas, colloid, dissolved salts and the like, and the purification treatment difficulty is high. Therefore, the comprehensive treatment of oil-containing wastewater for recycling and harmlessness has been the main direction for the future continuous development of oil fields, both from the viewpoint of environmental protection and from the viewpoint of energy recycling.
The utility model with application number 201810980880.1 discloses a skid-mounted oil field sewage treatment device and a skid-mounted oil field sewage treatment method, which realize oil-water separation of oil field sewage; the utility model with the patent number of 201820505912.8 discloses an oil-water separation device, which also realizes the separation of oil-water mixture.
The above devices realize the sewage treatment of the oil field to a certain extent, but because the separation mode of the above devices is single, the disadvantages of low separation efficiency, poor economy, incomplete separation and the like still exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to domestic oil field sewage treatment device inefficiency at present, bulky, purify degree low, shortcoming such as investment height. Aiming at the difference of oil drop particle sizes in oil field sewage, a graded series connection treatment mode is adopted, and according to the oil-containing particle sizes of the sewage in different stages, the multistage treatment is carried out by stages by adopting methods such as sewage pretreatment, liquid-liquid cyclone separation, coalescence settling separation, multi-composite material filtering separation and the like, a skid-mounted oil-water separation system based on particle size analysis is designed, the oil-containing sewage treatment requirements of plot fields, edge oil fields and offshore platforms are met, and the oil field reinjection water standard is met.
The utility model adopts the technical proposal that: the utility model provides a sled dress formula oil-water separation system, mainly by sewage pretreatment device, cyclone, coalescence settling device, filter equipment pass through pump and stainless steel pipeline and connect in series in proper order and constitute, according to the characteristic of the oily granularity of different stages in the sewage treatment process, adopt corresponding device to carry out the hierarchical processing.
In a preferred mode of the method, the sewage pretreatment device removes most of floating oil and solid impurities in the oil field sewage by combining a gravity method and an air floatation method, and comprises a tank body; an oil collecting device is arranged at the upper part in the tank body, and an air floating device is arranged at the lower part; the floating device sends floating oil and dispersed oil in the sewage to the surface of the sewage; the oil collecting device collects floating oil and dispersed oil floating on the surface.
Furthermore, the oil collecting device comprises a roller, an oil scraping baffle and an oil collecting groove; the surface of the roller is contacted with the oil scraping baffle; the oil scraping baffle is connected with the oil collecting tank.
Further, sewage pretreatment device still include solid impurity processing apparatus, solid impurity processing apparatus is located the lower part of jar body.
As a preferred mode of the utility model, the coalescence settling device comprises a sewage buffer chamber, a coarse graining device, a coalescence device, a free settling chamber and an oil-water separation chamber which are arranged in sequence; and a partition plate is arranged between the free settling chamber and the oil-water separation chamber.
Further preferably, the coalescing means is formed by stacking a plurality of corrugated coalescing sheets.
Further preferably, the oil-water separation chamber is divided into an oil collection chamber at the upper part and a water chamber at the lower part; the oil collecting chamber is communicated with the free settling chamber through an overflow port at the top of the partition plate; the water chamber is communicated with the free settling chamber through a communicating vessel.
Further preferably, a two-phase flow monitoring device is arranged in the free settling chamber; the two-phase flow monitoring device is matched with the communicating vessel to control the liquid level in the free settling chamber.
Further preferably, the coalescence settling device further comprises a dosing device, and the dosing device is arranged on an inlet pipeline of the coalescence settling device.
Compared with the prior art, the utility model, beneficial effect is: the utility model discloses based on the particle size analysis to oil field sewage, adopt the cascade stage treatment mode, according to the oily granularity of sewage in different stages, adopt methods such as sewage preliminary treatment, hydraulic cyclone, coalescence board subside, filter to carry out the stage treatment, improve oil-water separation efficiency, reach the oil field reinjection water standard; and skid-mounted integration is carried out, the requirements of oily sewage treatment of plot plots, marginal oil fields and offshore platforms are met, and the operation cost of an oil-water separation system is reduced.
Drawings
FIG. 1 is a connection diagram of the overall structure of a skid-mounted multistage series oil-water separation system in the embodiment of the present invention;
FIG. 2 is a schematic view of a pretreatment apparatus;
FIG. 3 is a schematic view of a swirling device;
FIG. 4 is a schematic view of a coalescing settling device;
fig. 5 is a schematic view of a filter device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides one of them embodiment is: the skid-mounted multistage series oil-water separation system is structurally connected as shown in figure 1, mainly comprises four parts, namely: the device comprises a sewage pretreatment device, a cyclone separation device, a coalescence settling device and a filtering device, wherein the four parts are sequentially connected in series through various pumps and pipelines, oily sewage enters a system from the sewage pretreatment device and is subjected to grading treatment from large to small according to the grain size of oil drops in the oily sewage, and finally water discharged from the filtering device reaches the oil field reinjection water standard.
In the present embodiment, as shown in fig. 2, the sewage pretreatment device includes a pretreatment tank, an oil-hydrophobic and oleophilic oil-collecting drum 3, a curved oil-scraping baffle 4, an oil collecting tank 5, a liquid level sensor 6, an air pump 13, a bubble generation device 9, a motor 14, a rotation mechanism 10, and the like, as shown in fig. 2. An oil collecting device consisting of an oil collecting roller 3, a curved oil scraping baffle 4 and an oil collecting groove 5 is arranged at the upper part of the pretreatment tank, the curved oil scraping baffle 4 is arranged along the peripheral surface of the oil collecting roller 3, and the oil collecting groove 5 is connected with the lower part of the curved oil scraping baffle 4. An air flotation device composed of an air pump 13 and an air bubble generating device 9 is arranged at the middle lower part of the pretreatment tank. A rotating mechanism 10 is provided below the bubble generating device 9, and the rotating mechanism is connected to a motor 14.
A liquid level sensor 6 is arranged on the inner wall of the pretreatment tank close to the upper part and fixed, and the liquid level sensor 6 monitors the liquid level height of sewage in the pretreatment tank and controls the flow of a sewage pump of a water inlet pipeline.
The bottom of the pretreatment tank is provided with a waste oil tank 12, and the left and right waste oil tanks 12 are communicated through a communication pipe 11. A level sensor 6 is also installed in the waste oil tank 12. The waste oil tank 12 is connected to the oil collecting tank 5 through an oil collecting conduit 7, and stores the waste oil collected by the oil collecting device, and when a predetermined liquid level is reached, the waste oil in the waste oil tank 12 is discharged through the first waste oil outlet 15 by the waste oil pump 20.
The first sewage outlet 8 on the pretreatment tank is connected with the water inlet 16 of the cyclone separation device through a pipeline. As shown in FIG. 3, the cyclone separation device is a cyclone, and the top of the cyclone 18 is provided with a second waste oil outlet 17 connected with a waste oil pump 20 through a pipeline. The bottom of the cyclone 18 is provided with a second effluent outlet 19. The second sewage outlet 19 is connected with the coalescence settling device water inlet pipe 22 through a pipeline and a pump. The front end of the water inlet pipe 22 of the coalescence settling device is provided with a dosing device 41 for filling a demulsifier into the pipeline.
In the present embodiment, as shown in fig. 4, the coalescing and settling device mainly includes a sewage buffer chamber 23, a coarse graining device 24, a coalescing device 27, a free settling chamber 28, and an oil-water separation chamber, which are arranged in this order. The water inlet pipe 22 of the coalescence settling device is connected with the sewage buffer chamber 23, and the water outlet end of the coalescence settling device is designed into a return structure, so that the impact force of water flow is effectively reduced.
The top and the bottom of the coarse graining device 24 are respectively provided with a filling opening and a discharging opening, so that the coarse graining filling material can be conveniently replaced. The coalescence device 27 is formed by stacking a plurality of corrugated coalescence plates, the coalescence plates are made of oleophilic and hydrophobic materials, and the appearance design of the corrugations is adopted, so that the collision chance of oil drops can be increased, small oil drops are fused into large oil drops, and the oil-water separation is facilitated. The two-phase flow monitoring device 26 is arranged in the free settling chamber 28, the liquid level height of the free settling chamber is controlled by controlling the sewage inflow, the electromagnetic valve 31 of the communicating vessel and the two-phase flow monitoring device 26, and the automatic recovery of the floating oil and the automatic recovery of the sewage after treatment are realized.
The free settling chamber 28 and the oil-water separation chamber are separated by a partition plate, and an overflow port is reserved at the top of the partition plate. The upper part of the oil-water separation chamber is an oil collection chamber, and the lower part of the oil-water separation chamber is a water chamber. The oil collection chamber is in communication with the free settling chamber via an overflow and the water chamber is in communication with the free settling chamber 28 via a communicator 30 with a solenoid valve 31.
The top of the free settling chamber 28 is provided with a vent 25 to keep the air pressure in the chamber balanced. The top of the oil collecting chamber is provided with a third waste oil outlet 29 which is connected with a waste oil pump through a pipeline. The bottom of the water chamber is provided with a third sewage outlet 32 connected to a water inlet 34 of the filtering device via a pipe and a sewage pump 33.
In this embodiment, the last stage is a filtration process, and as shown in fig. 5, the filtration apparatus is mainly composed of a tank 35 and a filter medium 36 filled in the tank. The top of the tank body 35 is provided with a water inlet 34 of the filtering device, and the bottom is provided with a reinjection water outlet 38. The filter unit is also equipped with a sewage parameter monitoring device 37. The filtering medium 36 is a composite material formed by more than two kinds of oleophylic and hydrophobic materials, and the oily sewage is finally treated by an adsorption filtration method, and the composite material is mainly used for removing a small part of emulsified oil and dissolved oil.
In the lower part of the filter unit, a sewage return outlet 39 is also provided. The sewage return outlet 39 is connected to the water inlet line of the coalescence settling device through a pipe and a pump.
The skid-mounted multistage series oil-water separation system of the embodiment has the following working principle and process description:
oilfield sewage enters the sewage pretreatment device through the sewage inlet pipe 1, and when the liquid level sensor 6 monitors that the liquid level reaches a preset height, a signal is sent to turn off the sewage pump. After the settlement of stewing, open air pump 13, produce even bubble through bubble generating device 9, accelerate the oil slick and the dispersed oil among the sewage to separate, to certain extent when the surface waste oil gathers, oleophylic hydrophobic oil collecting roller 3 begins to rotate, take away the surface waste oil through the waste oil contact with the liquid level, then scrape the waste oil of adhesion on the oil collecting roller 3 down through bent type oil scraping baffle 4, drip to in oil trap 5, finally in gathering oil tank 12 through gathering oil pipe 7 automatic collection, when the liquid level in the waste tank reaches predetermined liquid level, open waste oil pump 20, carry the waste oil to the appointed place of waste oil recovery along the pipeline, discharge through waste oil export 40. In the stage, most of the floating oil and dispersed oil in the oil field sewage are removed by means of combining a gravity method and an air floatation method, and meanwhile, the oil field sewage is pretreated.
The pretreated sewage is floated, and solid impurities sink. And (3) opening the sewage pump, pumping the pretreated sewage into the pipeline through the first sewage outlet 8, and allowing the sewage to enter the cyclone 18 through the water inlet 16 of the cyclone separation device for centrifugal separation so as to further remove floating oil and dispersed oil in the sewage. During the centrifugal process, light waste oil is transported to the waste oil outlet 40 through the second waste oil outlet 17 and the waste oil pump 20 through pipelines, and heavy water, emulsified oil and a small amount of dispersed oil enter the coalescence settling water inlet pipe 22 through the second sewage outlet 19 for further treatment.
After the sewage containing emulsified oil and a small amount of dispersed oil is mixed with the demulsifier added by the chemical feeding device 41 in the pipeline, the demulsifier destroys a stable boundary film on an oil bead interface and enters the sewage buffer chamber 23 through the coalescence settling water inlet pipe 22; the sewage passes through the coarse graining device 24 filled with coarse graining materials to coalesce the oil drops in the sewage into larger oil drop size, and the sewage is rectified to enter the coalescing device 27 uniformly.
The corrugated coalescence plate adopts oleophylic hydrophobic material, based on the collision principle, increases the collision probability such as oil drops in the sewage, forms the great oil drop of particle size, then enters into free settling chamber 28, and under the action of gravity, oil drops come-up gathering, forms the oil-water two-phase flow, and waste oil floats in the top of water, because water constantly gets into, under the action of gravity, the water of free settling chamber 28 lower part enters into the hydroecium through linker 30. A two-phase flow monitoring device 26 is arranged at the oil-water interface of the free settling chamber, and when the two-phase flow interface reaches a preset positionh 1When the oil collecting device is used, the electromagnetic valve 31 on the communicating vessel 30 is closed, the liquid level in the free settling chamber rises, and the floating oil enters the oil collecting chamber through the overflow port at the top of the partition plate; when the two-phase flow monitoring device 26 monitors that the two-phase flow interface reaches the predetermined positionh 2At this time, the solenoid valve 31 on the communicating vessel 30 is opened and the free settling chamber level returns to equilibrium under the action of gravity. Through the interconnector 30, the liquid level of the free settling chamber is kept balanced under the action of gravity. The waste oil in the oil collection chamber is transported from the waste oil pump 20 to the waste oil outlet 40 through the third waste oil outlet 29 via a pipeline, and the waste oil contains dissolved oil with smaller particle sizeThe sewage enters the filtering device through the third sewage outlet 32 and is treated in the next step.
When the coarse grained material needs to be replaced, the discharge opening at the bottom of the device is opened, the used coarse grained material is taken out, and new coarse grained material is filled in from the discharge opening.
The sewage after coalescence treatment enters a filtering device for filtering treatment, and the treated water meeting the requirements is recycled through a reinjection water outlet 38; when the sewage parameter monitoring device 37 gives an alarm, the water inlet 34 of the filtering device is closed, the sewage pump 33 is opened, sewage in the filtering tank is completely discharged through the waste water return outlet 39, a filtering medium in the filtering device is replaced, and filtering work is carried out after the replacement.
In the sewage treatment process, when solid impurities in the pretreatment device are collected to a certain degree, the motor 14 is turned on, the solid sediments are stirred and crushed by the rotating mechanism 10, and are sucked out by the siphon pump 21 and recovered through the solid residue outlet 42.
Claims (9)
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| CN202020431951.5U CN212655582U (en) | 2020-03-30 | 2020-03-30 | A skid-mounted multi-stage series oil-water separation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439862A (en) * | 2020-03-30 | 2020-07-24 | 山东省科学院海洋仪器仪表研究所 | A skid-mounted multi-stage series oil-water separation system |
| CN114942162A (en) * | 2022-05-17 | 2022-08-26 | 天津大学 | Device and method for measuring dissolved methane in sewage pipe network |
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2020
- 2020-03-30 CN CN202020431951.5U patent/CN212655582U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439862A (en) * | 2020-03-30 | 2020-07-24 | 山东省科学院海洋仪器仪表研究所 | A skid-mounted multi-stage series oil-water separation system |
| CN114942162A (en) * | 2022-05-17 | 2022-08-26 | 天津大学 | Device and method for measuring dissolved methane in sewage pipe network |
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