CN104148196A - Inlet rectifying device of gas-liquid cylindrical cyclone - Google Patents
Inlet rectifying device of gas-liquid cylindrical cyclone Download PDFInfo
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- CN104148196A CN104148196A CN201410376748.1A CN201410376748A CN104148196A CN 104148196 A CN104148196 A CN 104148196A CN 201410376748 A CN201410376748 A CN 201410376748A CN 104148196 A CN104148196 A CN 104148196A
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Abstract
The invention discloses an inlet rectifying device of a gas-liquid cylindrical cyclone. The design that an inlet rectifying tube expands for buffering and declines spirally is adopted, and the inlet rectifying device comprises an expanding and buffering pipe, a large-angle elbow pipe, a spiral declination pipe and a convergent nozzle which are connected sequentially. The technical effects are that when slug flow passes through an expanding and buffering section in the vertical direction, gas and liquid are mixed intensively, meanwhile, the speed and the length of a liquid plug both are reduced obviously, so that the intensity of the liquid blockage is decreased greatly, and can be dissipated easily; after entering the spirally declining section, the slug flow is forced to be converted into stratified flow under the double effects of centrifugal force and gravity, and the gas phase and the liquid phase are pre-separated; finally, the gas phase and the liquid phase are accelerated to enter the gas-liquid cylindrical cyclone tangentially for rotation flow separation via the convergent nozzle at an outlet of the rectifying pipe. By utilizing the inlet rectifying device, the existing gas-liquid cylindrical cyclone can be technically modified, and the separation efficiency of the gas-liquid cylindrical cyclone can be improved substantially so as to create great economic benefit for the oil and gas field; the inlet rectifying device is applied to submarine oil and gas field of the deep sea so as to provide technical support for the oil and gas field of the deep sea.
Description
Technical field
The present invention relates to a kind of column gas-liquid cyclone separator entrance fairing efficiently, belong to gas-liquid cyclone separator and Multiphase Flow technical field.
Background technology
Column gas-liquid cyclone separator (Gas-Liquid Cylindrical Cyclone, be called for short GLCC) is simple and compact for structure, energy consumption is low, quality is light, easy to maintenance, be convenient to build and install, be widely applied in recent years.General GLCC entrance structure is that gas-liquid mixed incoming flow tangentially enters gas-liquid column cyclone separator through the pipe that has a down dip afterwards through standpipe (having hole enlargement on standpipe), GLCC entrance structure has determined that the entrance liquid phase of separator distributes and the size of liquid phase tangential inlet speed, is one of key factor affecting GLCC stalling characteristic.Due to the difference of liquid phase flow velocity, heterogeneous fluid may present the multiple flow patterns such as stratified flow, slug flow, ring dress liquid spray in inlet tube.Kouba[Kouba G. E., Shoham O., Shirazi S.. Design and Performance of Gas-Liquid Cyclone Separators[C]. Proc., the BHR Group 7th International Meeting on Multiphase Flow, Cannes, France:June 7-9, 1995.] experimental study shows, the downward-sloping formation that is conducive to stratified flow of inlet tube, improve to a great extent gas-liquid separation effect, the scope of application of expansion column gas-liquid cyclone separator, experiment shows that the efficient range of operation of GLCC of vertical stratification entrance is approximately that entrance structure is the half of incline structure.What be worth proposition is, Mathiravedu[Mathiravedu R. S.. Control System Development and Performance Evaluation of LLCC Separators[D]. Tulsa, Oklahoma. The University of Tulsa, 2001.] prove by experiment, for column liquid liquid cyclone separator (LLCC), the corresponding separating property of horizontal access is better than inclination entrance.Gomez & Mohan[Gomez L., Mohan R., Shoham O. et al. Aspect Ratio Modeling and Design procedure for GLCC Compact Separators[J]. ASME Transactions, Journal of Energy Resources Technology, 1999, 121 (1) .] think that downward-sloping entrance structure makes to form eddy flow field after the liquid phase of initial gross separation rotates a circle below entrance, avoid the interference of gas phase ascending motion, the GLCC foaming phenomenon of horizontal access is even more serious, the pendular ring showed increased of Droplet Settling Area simultaneously, the tilt angled down of inlet tube is advisable between 25 ° ~ 30 °.Kouba[Kouba G. E. & O. Shoham. An Update of Gas-Liquid Cylindrical Cyclone (GLCC) Technology[R]. IBC Conference, Houston, Texas, 1997.] think that by observation the best entrance degree of tilt that has a down dip is about 27 °, pipe range should be got 1.0 ~ 1.5m, it should be noted that increasing inlet length is conducive to the stable of operating mode, but be subject to the restriction of installing space.The general form that adopts the straight tube that has a down dip of inlet tube of GLCC, the have a down dip application less [C. Deuel & Y. D. Chin. Field Validation and Learning of the Parque das Conchas (BC-10) Subsea Processing System and Flow Assurance Design[J] of pipe of spiral. Offshore Technology Conference, 2011].The caliber design criteria of GLCC inlet tube is generally based on Taitel & Dukler[Taitel Y. & A. E. Dukle. A Model for Predicting Flow Regime Transition in Horizontal and Near Horizontal Gas-Liquid Flow[J]. AIChE J., 1975.] stratified flow is converted to the criterion of slug flow or annular flow.General GLCC entrance rectifying tube is subject to the have a down dip distance of pipe of the restriction of installing space shorter, is difficult to realize the steady dissipation of liquid plug in the limited length that has a down dip; The gas-liquid interface simultaneously having a down dip in pipe is mutually vertical with nozzle wall surface, and Membrane Separator Cylinder for CFB Boiler is caused and continues to impact.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of column gas-liquid cyclone separator entrance fairing, it can effectively realize gas-liquid slug and flow to the conversion of laminar flow in larger liquid phase velocity interval, thereby more effectively improve the pre-separation effect of gas-liquid incoming flow, for column cyclone separator provides entrance incoming flow more stably, the scope of application of expansion column cyclone separator.
The present invention is in the limited installing space of column cyclone separator entrance, the entrance rectifying tube design concept that adopts hole enlargement buffering+spiral to have a down dip, make oil gas water three phase slug incoming flow be converted into laminar flow in limited mobile distance, in carrying out gas-liquid two-phase pre-separation, for separator column cyclone separator cyclonic separation section provides best entry condition, expand the scope of application of column cyclone separator.
General principle of the present invention is that the speed of liquid plug when liquid phase mixes aggravation in the time of the hole enlargement separator tube of slug flow by vertical direction all obviously reduces with length, and liquid plug intensity is declined to a great extent, change be easy to dissipation; Enter spiral and have a down dip after pipe, under the double action of centrifugal force and gravity, force slug flow to be converted into stratified flow, realize the pre-separation of gas-liquid two-phase; Make gas-liquid two-phase accelerate tangentially to enter column cyclone separator finally by the negative throat noz(zle) of over commutation pipe outlet and carry out cyclonic separation.
The concrete technical scheme of the present invention is as follows:
The present invention is the bend pipe of a both ends open, comprise the hole enlargement separator tube, wide-angle bend pipe, the spiral that are connected successively have a down dip pipe, negative throat noz(zle), hole enlargement separator tube adopts flaring design, for realizing the smooth transition of liquid plug, reduce the mixing of gas-liquid two-phase and the emulsification pretreatment of profit, hole enlargement angle is not more than 15 °, and ensures that the standpipe section volume after hole enlargement can hold the liquid measure of a liquid plug, wide-angle bend pipe is as the connecting elements of standpipe (hole enlargement separator tube) and helix tube (spiral have a down dip pipe), for ensureing that the mild of our department's liquid seperating plug flows, reduce the mixing of gas-liquid two-phase and the emulsification pretreatment of profit, adopt wide-angle bend pipe to carry out transition, wide-angle bend pipe comprises 77 ° of vertical bridge pieces of angle of bend and 40 ° of level connection joint bend pipes of angle of bend, the convergent curved surface of negative throat noz(zle) adopts level and smooth arc surface design, and nozzle cambered surface radius is got the radius of spin, and nozzle length is got the spiral caliber of 2 ~ 5 times, makes accelerator more steady, the spiral pipe that has a down dip is the design's core, adopt two sections of designs, for ensureing the smooth transition of junction, two sections of helix tube angles of inclination are identical, adopt the helix angle of 27 °, the screw diameter difference of two segment pipes, when can realizing so effective control of helix tube different parts centrifugal force, be convenient to the reasonable Arrangement of pipe arrangement, the helix tube in front adopts larger screw diameter, in the anglec of rotation of 1/4 circle, increase greatly like this helix tube length, the helix tube at rear adopts less screw diameter, in the anglec of rotation of 1/2 circle, smoothly realize like this conversion of stratified flow interface angle to vertical direction, create good stratified flow boundary condition for entering column cyclone structure, we are by Taitel & Dukler[Taitel Y. & A. E. Dukle. A Model for Predicting Flow Regime Transition in Horizontal and Near Horizontal Gas-Liquid Flow[J]. AIChE J., 1975.] Transition Criteria that slug flow changes to stratified flow does to carry out after having considered the improvement of centrifugal force effect the design of caliber afterwards of the hole enlargement separator tube caliber of pipe (spiral have a down dip) and screw diameter, liquid in pipe flow is larger, when intraluminal fluid position is higher, the fluid wave wave amplitude that air-flow blows afloat is up to pushing up to pipe, in the time of barrier gas circulation area, just change slug flow into by stratified flow.On the contrary, fluid flow is less, liquid level is when lower, and intraluminal fluid quantity not sufficient is when blocking pipeline, and liquid is blowed to tube wall by air-flow, and has partially liq to be dispelled into liquid mist by air-flow to be mixed in air-flow, to form ring-type liquid spray.When flow parameter is converted into dimensionless group, the reference variable of length is caliber
d, the reference variable of area is
d 2 , the reference variable of liquid phase is
ω sl with
ω sg , all represent with subscript " ~ ".Discriminant equation is:
(1)
The equation of momentum is:
(2)
In formula:
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
For the design criteria of the straight tube that has a down dip being applied to the spiral pipe that has a down dip, the acceleration item a in formula to be revised, the curvature diameter of establishing helix tube is
d, because the suffered acceleration of the effect liquid phase of centrifugal force is:
(15)
To acceleration of gravity
gand centripetal acceleration
a 1 after synthesizing, obtaining apparent acceleration is:
(16)
Fluid velocity adopts liquid phase true velocity herein.
The relation of liquid holdup and intraluminal fluid position height is as follows:
(17)
Various middle subscript
irepresent alternate,
sfor wetted perimeter.Various parameter declaration is as follows above:
x 2 for Luo-Ma parameter;
yfor dimensionless parameter, represent the impact of pipeline inclination angle, both can directly be tried to achieve by physical properties of fluids and pipe parameter, under turbulent condition
c l =
c g =0.184,
n=
m=0.2.Various middle dimensionless parameter is all dimensionless number
the function of the ratio of caliber (the intraluminal fluid position height with).
In the time that helix tube is designed, utilize above design criteria to calculate the have a down dip structural parameters of pipe of spiral by programming, and consider the whole matching of entrance rectification module and column cyclone separator, from filtering out spiral have a down dip pipe caliber, screw diameter in the suitable geometric parameter interval range of result of calculation gained.
Advantage of the present invention is that rectifying tube inside does not adopt any internals, can ensure its permanent failure-free operation; Cushion space between hole enlargement separator tube and spiral bending tube has been realized effective buffering of slug flow; In limited installing space, adopt the form of spiral bending tube, increase at double the length of the inlet tube section of having a down dip; The spontaneous centrifugal force field of helix tube has effectively promoted the dissipation of liquid plug and has made laminar flow interface be certain angle of inclination to enter column cyclone separator, has improved separative efficiency; Negative throat noz(zle) has been realized the steady acceleration of gas-liquid two-phase, has avoided the impact to column cyclone separator.The invention has the beneficial effects as follows, can utilize the present invention to undergo technological transformation to existing column cyclone separator, do not changing original mounting means, under the prerequisite of the installing space outside occupying volume, significantly do not improve the separative efficiency of column gas-liquid cyclone separator, for creating larger economic benefit in oil field; Utilize the present invention to design brand-new more efficient column eddy flow class separator, its range of application is extended to deep seafloor oil gas field as deep seafloor separator, for the exploitation of deepwater field provides technical support.
Brief description of the drawings
Fig. 1 is side-looking structural representation of the present invention.
Fig. 2 is plan structure schematic diagram of the present invention.
Fig. 3 is hole enlargement separator tube structural representation of the present invention.
Fig. 4 is wide-angle bend pipe structure schematic diagram of the present invention.
Fig. 5 is the spiral of the present invention pipe side-looking structural representation that has a down dip.
Fig. 6 is the spiral of the present invention pipe plan structure schematic diagram that has a down dip.
Fig. 7 is that the present invention gradually draws together nozzle schematic diagram.
Fig. 8 is that the present invention coordinates figure with GLCC.
Wherein, in Fig. 1, Fig. 2: 1-hole enlargement separator tube, 2-wide-angle bend pipe, the 3-spiral pipe that has a down dip, 4-negative throat noz(zle); In Fig. 3: 5-expanding head, 6-cushions standpipe; In Fig. 4: the vertical bridge piece of 7-, 8-level connection joint bend pipe; In Fig. 5, Fig. 6: the 9-small curve spiral section of having a down dip, the 10-deep camber spiral section of having a down dip; In Fig. 8: 11-gas-liquid column cyclone separator.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, topology layout of the present invention, operational process and innovation are described further.
Referring to accompanying drawing 1, accompanying drawing 2, the present invention combines the have a down dip advantage of pipe of hole enlargement buffer component and spiral, mainly be divided into hole enlargement buffering reduction of speed part and the spiral pipe liquid plug dissipative part that has a down dip, comprise hole enlargement separator tube 1, wide-angle bend pipe 2, spiral have a down dip pipe 3, negative throat noz(zle) 4.
Referring to accompanying drawing 3, hole enlargement separator tube 1 of the present invention comprises expanding head 5, buffering standpipe 6.For realizing the smooth transition of liquid plug, reduce the mixing of gas-liquid two-phase and the emulsification pretreatment of profit, the cushion space of buffering standpipe 6 is the caliber of 16 times, 15 ° of hole enlargement angles; Buffering standpipe volume will hold a liquid plug.
Referring to accompanying drawing 4, wide-angle bend pipe 2 of the present invention comprises vertical bridge piece 7, level connection joint bend pipe 8.Adopt two sections of circular arcs to carry out transition, vertically 77 ° of bridge piece 7 angle of bend, 40 ° of level connection joint bend pipe 8 angle of bend, wide-angle bend pipe 2 is as the connecting elements of standpipe section and pigtail, can ensure that the mild of our department's liquid seperating plug flows, and reduces the mixing of gas-liquid two-phase and the emulsification pretreatment of profit.
Referring to accompanying drawing 5, accompanying drawing 6, the spiral of the present invention pipe that has a down dip 3 comprises the small curve spiral section of having a down dip 9, the deep camber spiral section of having a down dip 10.27 °, pipe 3 inclination angle has a down dip.Small curve pigtail 9 rotates 1/4 circle, the increase of less radius of curvature the physical length of this section, the deep camber spiral section of having a down dip 10 rotation 1/2 circle, the increase of larger radius of curvature the centrifugal force of this section, realized vertically turning to of laminar flow interface.
Referring to accompanying drawing 7, negative throat noz(zle) 4 convergent curved surfaces of the present invention adopt level and smooth arc surface design, and cambered surface radius is got the radius of spin, and nozzle length is the spiral caliber of 3 times.
As shown in Figure 8, the course of work of the present invention is: oil gas water mixing section plug flow enters hole enlargement separator tube 1 through standpipe section, and the speed that liquid phase mixes aggravation time liquid plug all obviously reduces with length, and liquid plug intensity is declined to a great extent, change be easy to dissipation; Buffering after liquid plug through wide-angle bend pipe 2 enter gently spiral have a down dip pipe 3, under the double action of centrifugal force and gravity pressure slug flow is converted into stratified flow, realize the pre-separation of gas-liquid two-phase; Accelerate to enter gas-liquid column cyclone separator finally by negative throat noz(zle) 4.
Claims (7)
1. a column gas-liquid cyclone separator entrance fairing, it is characterized in that it comprises successively connected hole enlargement separator tube (1), wide-angle bend pipe (2), spiral have a down dip pipe (3), negative throat noz(zle) (4), described hole enlargement separator tube (1) adopts flaring design, hole enlargement angle is not more than 15 °, and ensures that the standpipe section volume after hole enlargement can hold the liquid measure of a liquid plug; Described wide-angle bend pipe (2), as the have a down dip connecting elements of pipe (3) of hole enlargement separator tube (1) and spiral, comprises vertical bridge piece (7), level connection joint bend pipe (8); The convergent curved surface of described negative throat noz(zle) (4) adopts level and smooth arc surface design, and nozzle cambered surface radius is got the radius of spin, and nozzle length is got 2-5 spiral caliber doubly; Described spiral have a down dip pipe (3) adopt two sections of designs, be respectively the small curve spiral section of having a down dip (9) and the deep camber spiral section of having a down dip (10).
2. fairing according to claim 1, is characterized in that described hole enlargement separator tube (1) comprises expanding head (5) and the buffering standpipe (6) being connected successively.
3. fairing according to claim 2, the cushion space that it is characterized in that described buffering standpipe (6) section is 16-18 caliber doubly, hole enlargement angle is 10-15 °.
4. fairing according to claim 3, is characterized in that described buffering standpipe (6) section hole enlargement angle is 15 °.
5. fairing according to claim 1, is characterized in that 77 ° of described vertical bridge piece (7) angle of bend, 40 ° of level connection joint bend pipe (8) angle of bend.
6. fairing according to claim 1, is characterized in that the described small curve spiral section of having a down dip (9) rotation 1/4 circle, the deep camber spiral section of having a down dip (10) rotation 1/2 circle.
7. fairing according to claim 1, is characterized in that have a down dip 27 °, pipe (3) inclination angle of described spiral.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289428A (en) * | 2015-05-12 | 2017-01-04 | 吉林大学 | Cool down device and metering system |
| CN108386180A (en) * | 2018-03-13 | 2018-08-10 | 海洋石油工程股份有限公司 | Caisson type air-liquid two-phase underwater separator |
| CN112081571A (en) * | 2020-07-21 | 2020-12-15 | 中国石油大学(北京) | Double-inlet pipe column type gas-liquid separator |
| CN112377710A (en) * | 2020-11-05 | 2021-02-19 | 长江大学 | Device for converting intermittent slug flow into continuous annular flow |
| CN112371360A (en) * | 2020-09-25 | 2021-02-19 | 东北石油大学 | Bent pipe coalescence type three-phase cyclone separator |
| FR3130832A1 (en) * | 2021-12-20 | 2023-06-23 | IFP Energies Nouvelles | Gas-liquid separation device with an accompanying zone for the liquid at the outlet, in particular for a three-phase fluidized bed reactor |
| WO2023130895A1 (en) * | 2022-01-04 | 2023-07-13 | 中国石油天然气股份有限公司 | Flow controller for uniform producing of horizontal well, and application method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023130895A1 (en) * | 2022-01-04 | 2023-07-13 | 中国石油天然气股份有限公司 | Flow controller for uniform producing of horizontal well, and application method |
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Application publication date: 20141119 Assignee: FUJIAN SNOWMAN Co.,Ltd. Assignor: China University of Petroleum (East China) Contract record no.: X2020980005286 Denomination of invention: A rectifying device at the inlet of a columnar gas-liquid cyclone separator Granted publication date: 20160608 License type: Exclusive License Record date: 20200824 |
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