CN105698841A - Oil-containing sewage cyclone flotation evaluation device and method using same - Google Patents
Oil-containing sewage cyclone flotation evaluation device and method using same Download PDFInfo
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- CN105698841A CN105698841A CN201610183835.4A CN201610183835A CN105698841A CN 105698841 A CN105698841 A CN 105698841A CN 201610183835 A CN201610183835 A CN 201610183835A CN 105698841 A CN105698841 A CN 105698841A
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Abstract
The invention provides an oil-containing sewage cyclone flotation evaluation device and a method using same. The oil-containing sewage cyclone flotation evaluation device comprises air floatation equipment, gas dissolving equipment, etc. The air floatation equipment comprises a cyclone cylinder, a speed adjusting motor, an inner cylinder, etc. The inner cylinder rotates for making sewage perform cyclone motion and forming a cyclone field which is uniform in the axial direction. The rotation speed of the inner cylinder is adjusted through the speed adjusting motor for realizing cyclone strength change, thereby evaluating effect of the cyclone strength to cyclone flotation de-oiling performance. The gas dissolving equipment comprises a multiphase gas dissolving pump, an expanding tube, etc. Through adjusting the flow and the pressure of the gas dissolving pump, parameters such as bubble diameter and dissolved gas amount are controlled for evaluating effect of a bubble characteristic to the cyclone flotation de-oiling performance. Through detecting oil content change of the sewage at the sampling opening of the air floatation equipment before and after testing, the effect of cyclone strength and bubble characteristic to the cyclone flotation de-oiling performance is evaluated. The oil-containing sewage cyclone flotation evaluation device and the method using same can realize optimization for key parameters of a cyclone flotation process, thereby laying the foundation for optimized design and high-efficiency operation of cyclone evaluation equipment.
Description
Technical field
The present invention relates to a kind of oil-polluted water cyclone air-flotation evaluating apparatus and method, carry out the evaluation of the cyclone air-flotation technology key parameters such as swirl strength, bubble diameter and molten tolerance with the oil-polluted water for different oil concentrations and oil droplet size, belong to oil-gas gathering and transportation system multi-phase separation technical field。
Background technology
The commonly used water flooding recovery mode in domestic and international oil field, the moisture content of oil field mining liquid increases sharply, and produces substantial amounts of oil-polluted water。The direct reinjection into reservoir of oil-polluted water, then can cause formation blockage, reduces the water absorption on stratum, thus causing the decline of yield。Ecological environment without processing directly discharge, then can be produced serious pollution by oil-polluted water。Therefore, oil-polluted water is effectively processed, all significant for the sustainable development and protection environment ensureing oil field。
Air flotation technology be process oil-contaminated water of oil field effective ways, usually used as gravitational settling subsequent treatment or filter even depth separate pretreatment。The ultimate principle of air flotation technology is by bubble adhesion oil droplet, and carries oil droplet buoyance lift, it is achieved oil-water separation。The important directions of air flotation technology development is to be combined with other isolation technics by air flotation technology, intensified Daqu separating effect。Wherein, cyclone air-flotation technology is a kind of flotation technology organically combined with air flotation technology by cyclone separation process, improves flotation efficiency by collision and the adhesion of suitable centrifugal force strengthening bubble with oil droplet。Centrifugal force strengthens pneumatically supported effect major embodiment both ways: on the one hand, in gravitational field, and the collision of bubble and oil droplet has randomness；And in centrifugal force field, bubble and oil droplet radially do " centripetal motion ", this directed movement significantly improves both collision probabilities。On the other hand, in gravitational field, low density oil droplet inertia is less, it is difficult to the streamline of deviation liquid phase and bubble hit；And centrifugal force field can improve the inertia of oil droplet motion, the short streamline that causes a deviation from collides and adhesion with bubble。
Swirl strength is the key factor affecting cyclone air-flotation technology oil removing performance。Owing to centrifugal force directly acts on collision and the adhesion process of bubble and oil droplet, swirl strength determines the deoiling effect of cyclone air-flotation, is the core parameter of cyclone air-flotation device。Meanwhile, in cyclone air-flotation process, deoiling effect is also produced material impact by the factor such as Bubble Characteristics (molten tolerance, bubble diameter) and sewage characteristic (oil concentration, oil droplet size)。Accordingly, it would be desirable to evaluate swirl strength, Bubble Characteristics, the sewage characteristic combined influence to oil removing performance, and then accurate evaluation cyclone air-flotation technique optimized parameter。
Cyclone air-flotation device is rotated by inner core and makes sewage do swirling motion, and forms axially uniform eddy flow field, and eddy flow field strengthening bubble and oil droplet collide and adhere to, thus realizing profit high efficiency separation。The change of swirl strength is realized, for evaluating the swirl strength impact on cyclone air-flotation oil removing performance by the rotating speed of buncher adjustment inner core。Bubble is prepared module by bubble and is prepared, by regulating flow and the pressure of air dissolved pump, control the parameter such as bubble diameter and molten tolerance, analyze the suitability of Bubble Characteristics (bubble diameter, molten tolerance) and sewage characteristic (oil droplet size, oil content), for evaluating the Bubble Characteristics impact on cyclone air-flotation oil removing performance。
In order to optimize the technological parameter of cyclone air-flotation technology, the deoiling effect of assessment oil-polluted water cyclone air-flotation technique, it is necessary to invent a set of cyclone air-flotation evaluating apparatus。This device can carry out the evaluation of the cyclone air-flotation key problem in technology parameters such as swirl strength, bubble diameter and molten tolerance for the oil-polluted water of different oil concentrations and oil droplet size, realizing preferred to cyclone air-flotation key parameter, optimization design and Effec-tive Function for cyclone air-flotation equipment provide foundation。
Summary of the invention
It is an object of the present invention to provide a kind of oil-polluted water cyclone air-flotation evaluating apparatus, can for the oil-polluted water of certain characteristic (oil droplet size, oil content), evaluate swirl strength and the Bubble Characteristics (bubble diameter, the molten tolerance) impact on cyclone air-flotation oil removing performance, solve the suitability problem of the selection of swirl strength in producing, Bubble Characteristics and sewage characteristic, for the structural parameters of cyclone air-flotation device, Field Characteristics, Bubble Characteristics reference frame is preferably provided。
Another object of the present invention is to provide the method for testing of a kind of above-mentioned evaluating apparatus, the method is using the oil concentration of oil-polluted water as flotation performance index, sewage with oil concentration Changing Pattern after certain flotation time can be obtained, evaluate oil removing performance when different parameters exactly。
A kind of oil-polluted water cyclone air-flotation evaluates system, it is characterized in that including gas inlet tube road, plumbing drain, bubble prepares pipeline and cyclone air-flotation device, wherein cyclone air-flotation device includes the whirl cylinder that is provided with inner core, and whirl cylinder and inner core are coaxially disposed, whirl cylinder top is provided with the buncher for driving inner core, described whirl cylinder top is provided with the water filling port of valve I and the air vent with valve J, skimming baffle and air distribution plate it is additionally provided with in whirl cylinder, and skimming baffle and air distribution plate lay respectively at above and below inner core, whirl cylinder side is provided with sewage outlet, oil drain out with valve K and the process water sampling mouth with valve L, and oil drain out position is higher than described skimming baffle, process water sampling mouth position lower than described air distribution plate, molten gas sewage inlet and the discharge outlet with valve M it is additionally provided with bottom whirl cylinder；
The sewage that described sewage outlet is discharged passes sequentially through plumbing drain, threeway, valve E, bubble prepare pipeline, molten gas sewage inlet and enter whirl cylinder, described threeway is also associated with gas inlet tube road, so that the effluent cycle flowing in whirl cylinder, and the sewage circulated is utilized to prepare bubble；
Described plumbing drain is followed successively by valve A, sewage flowmeter, valve B from sewage outlet to threeway；Described gas inlet tube Lu Ziqi gas introduction port is followed successively by valve C, gas flowmeter, valve D and vacuum meter to threeway；Described bubble is prepared pipeline and is followed successively by filter, heterogeneous air dissolved pump, check valve, expansion pipe, valve H from valve E to molten gas sewage inlet；Be provided with the molten gas sample tap of valve G bottom wherein said expansion pipe, top is provided with Pressure gauge and the residual air outlet with valve F。
Described air distribution plate and skimming baffle are porous plates。
The work process of the present invention is: injected in whirl cylinder by the water filling port at whirl cylinder top by a certain amount of oil-polluted water。Being rotated by inner core makes the oil-polluted water in whirl cylinder carry out swirling motion, and forms axially uniform eddy flow field。Regulate inner core rotating speed by buncher and control the swirl strength of sewage。Meanwhile, aspirate the sewage in whirl cylinder by heterogeneous air dissolved pump, and in gas inlet tube road, produce negative pressure, thus intake-gas。Gas and sewage are through the high shear of heterogeneous air dissolved pump, mixing, and are formed containing alveolate sewage after further dissolving in expansion pipe。The dissolved-air pressure adjusting expansion pipe can change the particle diameter of bubble。Being entered whirl cylinder containing alveolate sewage by molten gas sewage inlet, by air distribution plate, bubble is dispersed, bubble and oil droplet carry out flotation in swirling motion。By the change of oil content of wastewater in sewage sampling mouth before and after contrast test, analyze corresponding oil removal efficiency, evaluate swirl strength and the Bubble Characteristics impact on cyclone air-flotation oil removing performance。
The ultimate principle of the present invention is that buncher drives inner core to rotate, and makes the oil-polluted water in whirl cylinder form axially uniform eddy flow field。Prepare bubble prepared by module by entering eddy flow field bottom whirl cylinder by bubble, and carry out collide in eddy flow field with oil droplet and adhere to。In eddy flow field, there is radial velocity difference in bubble and oil droplet so that the two produces directed, orderly collision in radial direction, improves collision efficiency。Meanwhile, bubble and oil droplet obtain more energy under centrifugal action and overcome oil gas water interface resistance, the liquid phase between oil droplet and bubble are discharged, and improve adhesive efficiency。After bubble adheres to oil droplet, bubble carries oil droplet and shifts to liquid level, it is achieved profit high efficiency separation。
The invention has the beneficial effects as follows that the flow process of pilot system is simple, compact conformation；Being rotated by inner core makes sewage do swirling motion, and forms axially uniform eddy flow field；Buncher regulates inner core rotating speed and changes the swirl strength of sewage in whirl cylinder, can the impact on cyclone air-flotation oil removing performance of the accurate evaluation swirl strength；The flow of entrance sewage and gas is regulated by valve B, valve D, it is accurately controlled the molten tolerance of sewage, the dissolved-air pressure in expansion pipe is regulated by valve H, it is accurately controlled bubble diameter, thus can the accurate evaluation Bubble Characteristics (molten tolerance, the bubble diameter) impact on cyclone air-flotation oil removing performance, and then the preferably optimum swirl strength of corresponding certain characteristic sewage and Bubble Parameters, optimization design and Effec-tive Function for cyclone air-flotation equipment provide foundation。
Accompanying drawing illustrates:
Fig. 1It it is the population structure of the present inventionFigure。
Wherein, pipe 14 Pressure gauge 15 valve F16 residual air outlet 17 valve G18 molten gas sample tap 19 valve H20 molten gas sewage inlet 21 water filling port 22 valve I23 whirl cylinder 24 skimming baffle 25 inner core 26 sewage outlet 27 buncher 28 air vent 29 valve J30 valve K31 oil drain out 32 air distribution plate 33 valve L34 process water sampling mouth 35 valve M36 discharge outlet expanded by 1 valve A2 sewage flowmeter 3 valve B4 gas introduction port 5 valve C6 gas flowmeter 7 heterogeneous air dissolved pump 12 check valve 13 of valve D8 vacuum meter 9 valve E10 filter 11。
Fig. 2It it is the structural representation of the cyclone air-flotation device of the present inventionFigure。
Wherein, 20 molten gas sewage inlet 21 water filling port 23 whirl cylinder 24 skimming baffle 25 inner core 26 sewage outlet 27 buncher 28 air vent 31 oil drain out 32 air distribution plates 34 process water sampling mouth 36 discharge outlet。
Detailed description of the invention
Referring toAccompanying drawing 1,2, a kind of oil-polluted water cyclone air-flotation evaluates system, it is characterized in that including gas inlet tube road, plumbing drain, bubble prepares pipeline and cyclone air-flotation device, wherein cyclone air-flotation device includes the whirl cylinder 23 that is provided with inner core 25, and whirl cylinder 23 is coaxially disposed with inner core 25, whirl cylinder 23 top is provided with the buncher 27 for driving inner core 25, described whirl cylinder 23 top is provided with the water filling port 21 of valve I (22) and the air vent 28 with valve J (29), skimming baffle 24 and air distribution plate 32 it is additionally provided with in whirl cylinder 23, and skimming baffle 24 and air distribution plate 32 lay respectively at above and below inner core 25, whirl cylinder 23 side is provided with sewage outlet 26, oil drain out 31 with valve K30 and the process water sampling mouth 34 with valve L (33), and oil drain out 31 position is higher than described skimming baffle 24, process water sampling mouth 34 position lower than described air distribution plate 32, molten gas sewage inlet 20 and the discharge outlet 36 with valve M (35) it is additionally provided with bottom whirl cylinder 23；
The sewage that described sewage outlet 26 is discharged passes sequentially through plumbing drain, threeway, valve E (9), bubble prepare pipeline, molten gas sewage inlet 20 and enter whirl cylinder 23, described threeway is also associated with gas inlet tube road, so that the effluent cycle flowing in whirl cylinder 23, and the sewage circulated is utilized to prepare bubble；
Described plumbing drain is followed successively by valve A (1), sewage flowmeter 2, valve B (3) from sewage outlet 26 to threeway；Described gas inlet tube Lu Ziqi gas introduction port 4 to threeway is followed successively by valve C (5), gas flowmeter 6, valve D (7) and vacuumTable 8；Described bubble is prepared pipeline and is followed successively by filter 10, heterogeneous air dissolved pump 11, check valve 12, expansion pipe 13, valve H (19) from valve E (9) to molten gas sewage inlet 20；Be provided with the molten gas sample tap 18 of valve G (17) bottom wherein said expansion pipe 13, top is provided with pressureTable 14 and residual air outlet 16 with valve F (15)。
Described air distribution plate 32 and skimming baffle 24 are porous plates。
Described valve D (7) adjusting gas flow, the gas flow of pipeline, vacuum are flow through in gas flowmeter 6 meteringTable 8Detected gas aspiration vacuum level。
Described valve B (3), valve E (9) the combine regulation discharge of sewage, the discharge of sewage of pipeline is flow through in sewage flowmeter 2 metering。
The described solid impurity in filter 10 filter sewage, in order to avoid damaging heterogeneous air dissolved pump 11。Sewage in heterogeneous air dissolved pump 11 intake-gas and whirl cylinder 23, is mixed under elevated pressure conditions, shears, and is formed containing alveolate sewage。Check valve 12 can avoid the blade of sewage refluence and the heterogeneous air dissolved pump 11 that recoils。
Described expansion pipe 13 can dissolve bubble further by high pressure。Derive dissolved air water by the molten gas sample tap 18 expanded bottom pipe 13, be used for detecting bubble size distribution。Continuous phase gas is discharged by expanding the residual air outlet 16 at pipe 13 top。The pressure at expansion pipe 13 topTable 14 can monitor the dissolved-air pressure in expansion pipe 13。After valve H (19) is arranged on expansion pipe 13, it is possible to control the dissolved-air pressure of expansion pipe 13。
Oil droplet in sewage and bubble can be carried out cyclone air-flotation by described whirl cylinder 23, it is achieved oil-water separation。By water filling port 21, oil-polluted water can be injected whirl cylinder 23。Buncher 27 controls the rotating speed of inner core 25, makes sewage form the swirling motion of certain swirl strength。Gas after air supporting can be discharged by air vent 28。Molten gas sewage inlet 20 is connected with valve H (19), in order to bubble is injected whirl cylinder 23 by bottom。Bubble can be uniformly distributed by air distribution plate 32 on the cross section of whirl cylinder 23。Oil-continuous phase after dissolved air flotation can be isolated in the top of skimming baffle 24 by skimming baffle 24, is discharged by oil phase by oil drain out 31, and valve K (30) controls oil phase and discharges。Sewage outlet 26 is positioned at the lower section of skimming baffle 24, it is possible to by valve A (1), the water after air-flotation process is injected sewage flowmeter 2。Process water sampling mouth 34 and be positioned at below air distribution plate 32, process water sampling by valve L (33) control。Discharge outlet 36 is positioned at bottom whirl cylinder 23, the liquid phase in whirl cylinder 23 is discharged by valve M (35)。
Utilize above-mentioned cyclone air-flotation to evaluate system and carry out the preferred method of technological parameter, comprise the following steps:
1) take out the oil-polluted water of certain volume, open valve I (22) and sewage is injected by water filling port 21；
2) valve A (1), valve B (3), valve E (9), valve H (19) and valve J (29) are opened, other valve closing, start heterogeneous air dissolved pump 11, making sewage at heterogeneous air dissolved pump 11, circulate between expansion pipe 13 and whirl cylinder 23, the air in whirl cylinder 23 is discharged by air vent 28；
3) vacuumTable 8Reading when reaching to set negative pressure, open valve C (5), and control valve B (3), valve D (7) and valve E (9) control gas flow and the discharge of sewage, to control molten for sewage tolerance in setting value；
4) dissolved-air pressure of expansion pipe 13 is controlled by valve H (19)；The corresponding dissolved-air pressure set, is opened valve G (17), is sampled by molten gas sample tap 18, detect corresponding bubble size distribution；And timing opens valve F (15) to discharge the continuous phase gas that expansion pipe 13 top is gathered；
5) after the molten tolerance of sewage reaches setting value, start buncher 27, control inner core 25 rotating speed, make sewage carry out the swirling motion of varying strength；Molten gas sewage enters whirl cylinder 23 by molten gas sewage inlet 20, and after air distribution plate 32 gas distribution, carries out cyclone air-flotation with oil droplet, and after dissolved air flotation, oil phase is partitioned to the top of whirl cylinder 23 by skimming baffle 24；Open valve L (33), to the process water sampling after certain time oil removal by air bubbling, detect oil concentration；Open valve K (30) to be discharged by oil phase, open valve M (35) and the liquid phase in whirl cylinder 23 is discharged；
6) last with oil removal efficiency for index, by the change of oil content of wastewater in sewage sampling mouth before and after contrast test, analyze cyclone air-flotation deoiling effect, thus evaluating different swirl strength and the Bubble Characteristics impact on cyclone air-flotation oil removing ability, what may finally realize cyclone air-flotation technology key parameter is preferred, and optimization design and Effec-tive Function for cyclone air-flotation equipment provide foundation。
Claims (3)
1. an oil-polluted water cyclone air-flotation evaluates system, it is characterized in that including gas inlet tube road, plumbing drain, bubble prepares pipeline and cyclone air-flotation device, wherein cyclone air-flotation device includes the whirl cylinder (23) that is provided with inner core (25), and whirl cylinder (23) is coaxially disposed with inner core (25), whirl cylinder (23) top is provided with the buncher (27) for driving inner core (25), described whirl cylinder (23) top is provided with the water filling port (21) of valve I (22) and the air vent (28) with valve J (29), skimming baffle (24) and air distribution plate (32) it is additionally provided with in whirl cylinder (23), and skimming baffle (24) and air distribution plate (32) lay respectively at above and below inner core (25), whirl cylinder (23) side is provided with sewage outlet (26), oil drain out (31) with valve K (30) and process water sampling mouth (34) with valve L (33), and oil drain out (31) position is higher than described skimming baffle (24), process water sampling mouth (34) position lower than described air distribution plate (32), whirl cylinder (23) bottom is additionally provided with molten gas sewage inlet (20) and the discharge outlet (36) with valve M (35)；
The sewage that described sewage outlet (26) is discharged passes sequentially through plumbing drain, threeway, valve E (9), bubble prepare pipeline, molten gas sewage inlet (20) and enter whirl cylinder (23), described threeway is also associated with gas inlet tube road, so that the effluent cycle flowing in whirl cylinder (23), and the sewage circulated is utilized to prepare bubble；
Described plumbing drain is followed successively by valve A (1), sewage flowmeter (2), valve B (3) from sewage outlet (26) to threeway；Described gas inlet tube Lu Ziqi gas introduction port (4) to threeway is followed successively by valve C (5), gas flowmeter (6), valve D (7) and vacuumTable (8)；Described bubble is prepared pipeline and is followed successively by filter (10), heterogeneous air dissolved pump (11), check valve (12), expansion pipe (13), valve H (19) from valve E (9) to molten gas sewage inlet (20)；Wherein said expansion pipe (13) bottom is provided with the molten gas sample tap (18) of valve G (17), top is provided with pressureTable (14) the residual air outlet (16) with valve F (15)。
2.Such as claimOil-polluted water cyclone air-flotation described in 1 evaluates system, it is characterised in that described air distribution plate (32) and skimming baffle (24) are porous plates。
3. utilize cyclone air-flotation described in claim 1 to evaluate system and carry out the preferred method of technological parameter, it is characterised in that comprise the following steps:
1) take out the oil-polluted water of certain volume, open valve I (22) and sewage is injected by water filling port (21)；
2) valve A (1), valve B (3), valve E (9), valve H (19) and valve J (29) are opened, other valve closing, start heterogeneous air dissolved pump (11), making sewage at heterogeneous air dissolved pump (11), circulate between expansion pipe (13) and whirl cylinder (23), the air in whirl cylinder (23) is discharged by air vent (28)；
3) vacuumTable (8) when reading reaches to set negative pressure, open valve C (5), and control valve B (3), valve D (7) and valve E (9) control gas flow and the discharge of sewage, so that molten for sewage tolerance is controlled in setting value；
4) dissolved-air pressure of expansion pipe (13) is controlled by valve H (19)；The corresponding dissolved-air pressure set, opens valve G (17), is sampled by molten gas sample tap (18), detects corresponding bubble size distribution；And timing opens valve F (15) to discharge the continuous phase gas that expansion pipe (13) top is gathered；
5) after the molten tolerance of sewage reaches setting value, start buncher (27), control inner core (25) rotating speed, make sewage carry out the swirling motion of varying strength；Molten gas sewage enters whirl cylinder (23) by molten gas sewage inlet (20), and after air distribution plate (32) gas distribution, cyclone air-flotation is carried out with oil droplet, after dissolved air flotation, oil phase is partitioned to the top of whirl cylinder (23) by skimming baffle (24)；Open valve L (33), to the process water sampling after certain time oil removal by air bubbling, detect oil concentration；Open valve K (30) to be discharged by oil phase, open valve M (35) and the liquid phase in whirl cylinder (23) is discharged；
6) last with oil removal efficiency for index, by the change of oil content of wastewater in sewage sampling mouth before and after contrast test, analyze cyclone air-flotation deoiling effect, thus evaluating different swirl strength and the Bubble Characteristics impact on cyclone air-flotation oil removing ability, realizing preferred to cyclone air-flotation technology key parameter, optimization design and Effec-tive Function for cyclone air-flotation equipment provide foundation。
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| CN111378486A (en) * | 2018-12-28 | 2020-07-07 | 中国石油化工股份有限公司 | Device and method for continuously removing suspended matters in crude oil |
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| CN111348702A (en) * | 2020-03-27 | 2020-06-30 | 陕西山秦能源技术服务有限公司 | Vacuum demulsification sterilization cyclone air flotation separation tank and separation method thereof |
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| CN105698841B (en) | 2017-10-13 |
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