阅读说明：本技术 一种气液分离器与气液分离方法 (Gas-liquid separator and gas-liquid separation method ) 是由 王英策 张光黎 李合刚 于 2018-09-05 设计创作，主要内容包括：本发明公开了一种气液分离器与气液分离方法。气液分离器设有气液分离器筒体(10),其内设有螺旋分离器(5)。螺旋分离器筒体的上部设有螺旋分离器入口管(51),底部设有第一导液管(2)。螺旋分离器筒体的轴心线区域设有升气管(6)垂直管段,升气管垂直管段与螺旋分离器圆筒形筒体之间设有螺旋板(52)。上下相邻两圈螺旋板之间形成螺旋通道,螺旋分离器入口管的出口与螺旋通道的顶部入口相通。螺旋分离器筒体与气液分离器筒体之间设有支撑板(9),支撑板上设有扭带分离器(7)和第二导液管(8)。本发明公开了采用上述气液分离器进行气液分离的方法。本发明可用于石油化工等行业中的多种工艺过程,平稳高效地进行气液分离。(The invention discloses a gas-liquid separator and a gas-liquid separation method. The gas-liquid separator is provided with a gas-liquid separator cylinder body (10) in which a spiral separator (5) is arranged. The upper part of the cylinder body of the spiral separator is provided with a spiral separator inlet pipe (51), and the bottom of the cylinder body of the spiral separator is provided with a first liquid guide pipe (2). The axial lead area of the cylinder body of the spiral separator is provided with a riser (6) vertical pipe section, and a spiral plate (52) is arranged between the riser vertical pipe section and the cylindrical cylinder body of the spiral separator. A spiral channel is formed between two adjacent circles of spiral plates, and an outlet of an inlet pipe of the spiral separator is communicated with an inlet at the top of the spiral channel. A supporting plate (9) is arranged between the cylinder body of the spiral separator and the cylinder body of the gas-liquid separator, and a twisted belt separator (7) and a second liquid guide pipe (8) are arranged on the supporting plate. The invention discloses a method for gas-liquid separation by adopting the gas-liquid separator. The invention can be used for various technological processes in the industries of petrochemical industry and the like, and stably and efficiently performs gas-liquid separation.)

1. The utility model provides a vapour and liquid separator is equipped with vapour and liquid separator barrel (10), and the middle part of vapour and liquid separator barrel (10) is equipped with entry diffuser (1), and the lower part is equipped with liquid phase outlet pipe (3), its characterized in that: be equipped with spiral separator (5) in vapour and liquid separator barrel (10), the upper portion of spiral separator (5) barrel is equipped with spiral separator inlet tube (51), the bottom is equipped with first catheter (2), the axial lead region of spiral separator (5) barrel is equipped with riser (6) vertical tube section, be equipped with spiral plate (52) between riser (6) vertical tube section and the spiral cylinder separator barrel, form helical passage between two adjacent circles spiral plate (52) from top to bottom, the export of spiral separator inlet tube (51) communicates with each other with helical passage's top entry, be equipped with backup pad (9) between spiral separator (5) barrel and vapour and liquid separator barrel (10), be equipped with twisted strip separator (7) and second catheter (8) on backup pad (9), twisted strip separator (7) are located backup pad (9) top, second catheter (8) are located backup pad (9) below.

2. The gas-liquid separator of claim 1, wherein: the twisted belt separator (7) is provided with an outer barrel (71) and an inner pipe (72), an annular channel (77) is formed between the outer barrel and the inner pipe, a bottom outlet of the annular channel (77) is located above the support plate (9), the top of the outer barrel (71) is provided with a top plate (75) and an elbow (76), the top of the inner pipe (72) is open, a twisted belt (73) is arranged in the inner pipe (72), the bottom of the inner pipe (72) is connected with the support plate (9), or the inner pipe is connected with a vertical pipe on the support plate (9) through a flange (14).

3. The gas-liquid separator of claim 2, wherein: a circle of twisted belt separators (7) are arranged on a support plate (9) around the axial lead of a cylinder of a spiral separator (5), all the twisted belt separators (7) are positioned on an installation circle (78) on the support plate (9), the projection of the axial lead of each elbow (76) is a straight line and is tangent to the projection of the installation circle (78) on a horizontal projection plane, and the projection of the outlet of each elbow (76) is positioned on one of the left side or the right side of the projection of the central point of the inlet of each elbow.

4. The gas-liquid separator of claim 1, wherein: the outlet of the second liquid guide pipe (8) is connected to the first liquid guide pipe (2), the inner wall of the cylindrical barrel of the gas-liquid separator is provided with an anti-impact baffle (4), the inner wall close to the cylindrical barrel of the gas-liquid separator is provided with a liquid collection tank (12), and the outlet of the first liquid guide pipe (2) extends into the liquid collection tank (12) and is close to the anti-impact baffle (4).

5. The gas-liquid separator according to claim 1 or 2, wherein: the spiral plate (52) in the spiral separator (5) is a regular-helicoid plate, the width of the spiral plate is 50-300 mm, the inner side edge of the spiral plate (52) connected with the outer wall of the vertical pipe section of the gas lift pipe (6) is in a cylindrical spiral shape, the lift angle is 5-35 degrees, and the number of turns of the spiral plate (52) is 10-30.

6. The gas-liquid separator of claim 2, 3, or 4, wherein: the width of a torsion band (73) in the torsion band separator (7) is equal to the inner diameter d of the inner tube (72), the pitch H of the torsion band (73) is 40-750 mm, the total length L is 2-15 times of the inner diameter d of the inner tube (72), the inner diameter d of the inner tube (72) is 40-150 mm, and the distance a from the top of the inner tube (72) to the top plate (75) is 20-150 mm.

7. The gas-liquid separator of claim 2, 3, or 4, wherein: the bending angle of the elbow (76) in the twisted belt separator (7) is 45-90 degrees.

8. The gas-liquid separator of claim 7, wherein: 8-64 twisted belt separators (7) are arranged.

9. The gas-liquid separator of claim 1, wherein: the supporting plate (9) is an inverted truncated cone surface-shaped plate, and the included angle between a generatrix and the horizontal plane is 10-30 degrees.

10. A method for gas-liquid separation using the gas-liquid separator according to claim 1, characterized by comprising the steps of: the gas-liquid two-phase fluid enters an inlet diffuser (1), the gas-liquid two-phase fluid enters a gas-liquid separator cylinder (10) from an outlet of the inlet diffuser (1) downwards to be separated for the first time, the separated liquid phase enters the lower part of the gas-liquid separator cylinder (10), the separated gas phase containing liquid drops flows upwards and enters a twisted belt separator (7) to be separated for the second time, the liquid phase separated by the twisted belt separator (7) flows downwards onto a support plate (9), then enters a first liquid guide pipe (2) through a second liquid guide pipe (8) or enters the lower part of the gas-liquid separator cylinder (10) through the second liquid guide pipe (8), the gas phase containing liquid drops separated by the twisted belt separator (7) enters a spiral separator (5) to be separated for the third time, the separated gas phase flows out from a gas lift pipe 6, the separated liquid phase enters a first liquid guide pipe 2, and the liquid phase in the first liquid guide pipe 2 enters the lower part of the gas-liquid separator cylinder (10).

Technical Field

The invention belongs to the technical field of gas-liquid separation, and relates to a gas-liquid separator and a gas-liquid separation method.

Background

The gas-liquid separator is an important device of a modern process industrial system, is widely applied to the technical processes of oil product hydrogenation, wet desulphurization, flue gas waste heat utilization, wet dedusting, fermentation and the like in the petrochemical industry, and is used for separating and removing harmful substances or efficiently recovering useful substances. At present, most of gas-liquid separators adopted in the petrochemical industry are single-stage separators and are provided with gas-liquid separator cylinders. The top of the gas-liquid separator barrel is provided with a gas-phase outlet pipe, the lower part of the gas-liquid separator barrel is provided with a liquid-phase outlet pipe, the middle part of the gas-liquid separator barrel is provided with an inlet diffuser, and a defoaming net is arranged above the inlet diffuser. During operation, gas-liquid two-phase fluid enters the gas-liquid separator from the inlet diffuser for flash separation, and a large amount of liquid phase flows to the bottom of the separator. A large amount of gas phase carries the droplets upwards, and droplets of different sizes are separated according to the difference of the height of the gas phase space between the inlet diffuser and the demister by means of the gravity of the droplets. At the same time, the demister network is capable of coalescing liquid droplets entrained in the remaining gas phase. The gas phase after gas-liquid separation is discharged from a gas phase outlet pipe. The gas-liquid separator described above has two problems: first, the separation effect is not good enough, and the separated gas phase still contains droplets having a particle size of 30 μm or more. For example, the compressor inlet separator has strict requirements on the liquid content in the gas phase, and the above separation effect cannot be satisfied. Second, the height of the gas phase space is large, resulting in a large overall size of the gas-liquid separator. When the gas-liquid separator cylinder must be integrally forged, the equipment cost is drastically increased.

Disclosure of Invention

The invention aims to provide a gas-liquid separator and a gas-liquid separation method, which aim to solve the problems of poor gas-liquid separation effect, large height of a gas phase space and the like of the conventional gas-liquid separator.

In order to solve the problems, the invention adopts the technical scheme that: the utility model provides a vapour and liquid separator is equipped with the vapour and liquid separator barrel, and the middle part of vapour and liquid separator barrel is equipped with the entry diffuser, and the lower part is equipped with liquid phase outlet pipe, its characterized in that: be equipped with the spiral separator in the vapour and liquid separator barrel, the upper portion of spiral separator barrel is equipped with the spiral separator inlet tube, the bottom is equipped with first catheter, the axial lead region of spiral separator barrel is equipped with riser vertical pipe section, be equipped with the spiral plate between riser vertical pipe section and the spiral separator cylinder barrel, form the helical passage between the adjacent two rings of spiral plates from top to bottom, the export of spiral separator inlet tube communicates with each other with the top entry of helical passage, be equipped with the backup pad between spiral separator barrel and the vapour and liquid separator barrel, be equipped with twisted strip separator and second catheter in the backup pad, it is located the backup pad top to twist strip separator, the second catheter is located the backup pad below.

The method for carrying out gas-liquid separation by adopting the gas-liquid separator comprises the following steps: the gas-liquid two-phase fluid enters an inlet diffuser, the gas-liquid two-phase fluid enters a gas-liquid separator cylinder from an outlet of the inlet diffuser downwards for primary separation, the separated liquid phase enters the lower part of the gas-liquid separator cylinder, the separated gas phase containing liquid drops flows upwards and enters a twisted belt separator for secondary separation, the liquid phase separated by the twisted belt separator flows downwards onto a supporting plate and then enters a first liquid guide pipe through a second liquid guide pipe or enters the lower part of the gas-liquid separator cylinder through a second liquid guide pipe, the gas phase containing liquid drops and separated by the twisted belt separator enters a spiral separator for tertiary separation, the separated gas phase flows out from a gas lift pipe, the separated liquid phase enters a first liquid guide pipe, and the liquid phase in the first liquid guide pipe enters the lower part of the gas-liquid separator cylinder.

The invention has the following beneficial effects: (1) the gas-liquid two-phase fluid is subjected to three times of separation in the gas-liquid separator, wherein the second time of separation in the twisted belt separator and the third time of separation in the spiral separator can greatly improve the gas-liquid separation efficiency. By adopting the invention, good gas-liquid separation effect can be obtained, and liquid drops with the particle size of more than 30 micrometers can be separated. (2) Compared with the traditional gas-liquid separator, under the condition of the same treatment capacity and the same separation effect, the gas-phase space height (the vertical distance between the inlet diffuser and the supporting plate) of the gas-liquid separator can be reduced by 25-50 percent, so that the overall size of the gas-liquid separator can be reduced, and the investment of the gas-liquid separator is reduced (particularly when the barrel of the gas-liquid separator needs to be integrally forged).

The invention can meet the requirements of large-scale device and higher requirements on separation and environmental protection, can be used for various technological processes in the industries of petrochemical industry and the like, widens the application range of the gas-liquid separator, and stably and efficiently performs gas-liquid separation.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The drawings and detailed description do not limit the scope of the invention as claimed.

Drawings

FIG. 1 is a schematic view of the structure of a gas-liquid separator of the present invention.

Fig. 2 is an enlarged schematic view of the twist strip separator of fig. 1.

Fig. 3 is a sectional view (enlarged) taken along line a-a in fig. 1.

Fig. 4 is a sectional view taken along line B-B in fig. 1.

In fig. 1 to 4, the same reference numerals denote the same technical features.

Detailed Description

Referring to fig. 1, 2, 3 and 4, the gas-liquid separator of the present invention is provided with a gas-liquid separator cylinder 10, and the gas-liquid separator cylinder 10 mainly includes a gas-liquid separator cylindrical cylinder, a top head and a bottom head; an outlet pipe is arranged on the top end socket and is sealed by a sealing plate 13. The middle part of the gas-liquid separator cylinder 10 is provided with an inlet diffuser 1, and the lower part is provided with a liquid phase outlet pipe 3. A vortex breaker 11 may be provided at the inlet of the liquid-phase outlet pipe 3 to prevent the liquid phase from swirling at the inlet of the liquid-phase outlet pipe 3. The inlet diffuser 1 is made of a round pipe and has an end surface structure, and the outlet is downward; the projection area of the outlet on the horizontal projection plane is more than 1.5 times of the cross section area (calculated according to the inner diameter of the circular pipe) of the inlet diffuser. The gas-liquid two-phase fluid impacts the end surface of the inlet diffuser 1, so that the gas-liquid separation effect can be improved; the outlet is downward, so that the gas and the liquid can flow out from the outlet, and the stroke of the gas phase and the gas-liquid gravity separation space are increased.

The barrel 10 of the gas-liquid separator is internally provided with a spiral separator 5. The barrel of the spiral separator 5 consists of a cylindrical barrel of the spiral separator and an inverted conical surface barrel positioned below the cylindrical barrel, and the top of the cylindrical barrel is closed by a sealing plate 13. The upper part of the cylinder body of the spiral separator 5 is provided with a spiral separator inlet pipe 51, and the bottom part is provided with a first liquid guide pipe 2. The axial lead area of the cylindrical barrel of the spiral separator is provided with a vertical pipe section of the riser 6, and the vertical pipe section of the riser 6 passes through the sealing plate 13 and is connected with the horizontal pipe section of the riser 6. The bottom of the vertical pipe section of the gas lift pipe 6 is an inlet which is also the inlet of the gas lift pipe 6; the other end of the riser 6 is an outlet. The cylinder 10 of the gas-liquid separator, the cylinder of the spiral separator 5 and the vertical pipe section of the riser 6 are generally coaxially arranged.

A spiral plate 52 is arranged between the vertical pipe section of the riser 6 and the cylindrical barrel of the spiral separator, and the inner side edge and the outer side edge of the spiral plate 52 are respectively welded on the outer wall of the vertical pipe section of the riser 6 and the inner wall of the cylindrical barrel of the spiral separator. The spiral plate 52 can be left-handed or right-handed, and a spiral channel is formed between two adjacent turns of the spiral plate 52. The spiral separator inlet pipe 51 is arranged tangentially to the cylindrical barrel of the spiral separator and its outlet communicates with the top inlet of the spiral channel.

A support plate 9 is provided between the cylindrical barrel of the spiral separator and the cylindrical barrel of the gas-liquid separator, the support plate 9 being located between the inlet diffuser 1 and the spiral separator inlet pipe 51, typically at the upper middle portion of the cylindrical barrel 10 of the gas-liquid separator. The support plate 9 is provided with a twisted belt separator 7 and a second liquid guide pipe 8, the twisted belt separator 7 is positioned above the support plate 9, and the second liquid guide pipe 8 is positioned below the support plate 9. The top inlet of the second liquid guide pipe 8 is connected with the supporting plate 9, and the joint is the lower position of the supporting plate 9, so that the liquid phase on the supporting plate 9 can easily enter the second liquid guide pipe 8.

Referring to fig. 2 and also to fig. 1 and 3, the twist separator 7 is provided with an outer barrel 71 and an inner tube 72 forming an annular channel 77 therebetween. The bottom of the annular channel 77 is uniformly provided with a plurality of positioning pins 74, and the positioning pins 74 are welded with the outer cylinder 71 and the inner pipe 72. The bottom outlet of the annular channel 77 is located above the support plate 9. The top of the outer cylinder 71 is provided with a top plate 75 and an elbow 76, and the top of the inner pipe 72 is open. The inner tube 72 is provided with a torsion strap 73, and the torsion strap 73 is formed by twisting a metal sheet and can be rotated left or right. The sides of the torsion strap 73 are welded to the inner wall of the inner tube 72, with the top of the torsion strap 73 generally flush with the top of the inner tube 72. The bottom of the inner pipe 72 is connected to the support plate 9 (not shown) or to a riser on the support plate 9 via the flange 14 (as shown in fig. 1 and 2).

The number of the twisted belt separators 7 is generally 8-64, and the twisted belt separators are determined by the inner diameter of the inner pipe 72 in the twisted belt separator 7 and the handling capacity of the gas-liquid two-phase fluid. In a preferred embodiment of the invention, a ring of twist separators 7 is arranged on the support plate 9 around the axis of the barrel of the spiral separator 5, all twist separators 7 lying on a mounting circle 78 on the support plate 9. On the horizontal projection plane, the projection of the axial lead of each elbow 76 is a straight line and is tangent to the projection of the installation circle 78, and the projection of the outlet of each elbow 76 is positioned on one of the left side and the right side of the projection of the central point of the inlet of each elbow. The advantage of the above preferred scheme is that the gas phase separated by each twisted belt separator 7 can rotate in the same direction after flowing out from the elbow 76, which is beneficial to further enhancing the gas-liquid separation effect.

Referring to fig. 1, the outlet of the second liquid conduit 8 is connected to the first liquid conduit 2. Referring to fig. 1 and 4, the inner wall of the cylindrical barrel of the gas-liquid separator is provided with an anti-impact baffle 4, and the inner wall of the cylindrical barrel of the gas-liquid separator is provided with a liquid collecting tank 12. The outlet of the first liquid guide pipe 2 extends into the upper part of the liquid collecting tank 12 and is close to the anti-scouring baffle 4, and the anti-scouring baffle 4 can slow down the erosion of the liquid phase flowing out from the outlet of the first liquid guide pipe 2 to the inner wall of the gas-liquid separator cylinder 10. The outlet of the second liquid conduit 8 may also extend into the sump 12 and close to the baffle 4 instead of being connected to the first liquid conduit 2. The bottom of the liquid collecting tank 12 is an outlet and is positioned in the liquid phase at the lower part of the gas-liquid separator cylinder 10; reference numeral 16 denotes the liquid surface of the liquid phase in the lower part of the gas-liquid separator cylinder 10.

The sump 12 shown in fig. 1 and 4 is bounded by the plate assembly 15 and the inner wall of the cylindrical barrel of the gas-liquid separator. The plate assembly 15 is provided with an upper vertical plate and a lower vertical plate, and the bottom of the upper vertical plate is connected with the top of the lower vertical plate by a horizontal plate. Both sides of the plate assembly 15 are welded to the inner wall of the cylindrical barrel of the gas-liquid separator.

The invention uses the first liquid guide pipe 2, the second liquid guide pipe 8 and the liquid collecting tank 12, which can effectively avoid the contact of the ascending gas phase and the descending liquid phase after separation; this contact can cause secondary back-mixing, reducing overall separation efficiency.

In the invention, the spiral plate 52 in the spiral separator 5 is a regular spiral surface plate, the width is generally 50-300 mm, and the thickness is generally 2-10 mm. The inner side edge of the spiral plate 52 connected with the outer wall of the vertical pipe section of the gas lift pipe 6 is in a cylindrical spiral shape, and the lift angle is generally 5-35 degrees. The number of turns of the spiral plate 52 is generally 10 to 30.

The width of the torsion band 73 in the torsion band separator 7 is equal to the inner diameter d of the inner pipe 72, and the thickness is generally 2-15 mm. The pitch H of the twisted belt 73 is generally 40 to 750 mm, and the total length L is generally 2 to 15 times of the inner diameter d of the inner tube 72. The ratio of the pitch H of the twisted strip 73 to the inner diameter d of the inner tube 72 (i.e., the twist ratio) is generally 1 to 5. The inner diameter d of the inner tube 72 is determined comprehensively according to factors such as separation requirements, scaling tendency of fluid, operating conditions and the like, and d is generally 40-150 mm. The distance a from the top of the inner tube 72 to the top plate 75 is typically 20 to 150 mm. The inner diameter of the outer cylinder 71 is generally 1.05 to 1.5 times the outer diameter of the inner tube 72, and the minimum distance from the bottom of the outer cylinder 71 to the upper surface of the support plate 9 is not less than 30 mm. The inner diameter means the inner diameter and the outer diameter means the outer diameter.

The bend 76 of the twisted strip separator 7 is used to control the flow direction of the gas phase flowing out from the bend 76, and the bend angle of the bend 76 is typically 45-90 degrees.

Referring to fig. 1 and 3, the support plate 9 is generally an inverted truncated conical surface plate, and the included angle between the generatrix of the plate and the horizontal plane is generally 10 to 30 degrees.

The materials of the components of the gas-liquid separator are carbon steel, stainless steel, alloy steel and the like.

The method for gas-liquid separation by adopting the gas-liquid separator shown in the attached drawing comprises the following steps: the gas-liquid two-phase fluid enters the inlet diffuser 1, and enters the gas-liquid separator cylinder 10 from the outlet of the inlet diffuser 1 downward for first separation (flash separation) into a gas phase mainly containing gas and a liquid phase mainly containing liquid. The separated liquid phase enters the lower part of the cylinder 10 of the gas-liquid separator, and the separated gas phase containing liquid drops flows upwards and enters the twisted belt separator 7 for secondary separation. Specifically, the gas phase enters the inner tube 72 from the bottom of the inner tube 72 and flows upward, and flows in a spiral shape while passing through the twisted strip 73. Under the action of centrifugal force, the liquid droplets flow toward the inner wall of the inner tube 72, and the gas phase flows toward the axial center line region of the inner tube 72. After the liquid phase and the gas phase flow out from the top of the inner pipe 72, the liquid phase enters the annular channel 77 under the combined action of gravity and the inner walls of the outer cylinder 71 and the top cover 75 and flows downwards, flows downwards onto the support plate 9 from the bottom outlet of the annular channel 77, and then enters the first liquid guide pipe 2 through the second liquid guide pipe 8. The gas phase flowing out of the top of the inner tube 72 enters the elbow 76 and impinges on the elbow 76, with the gas and liquid again separating during impingement. The separated gas phase containing liquid droplets flows out of the outlet of the elbow 76 and upwards through the spiral separator inlet pipe 51 into the spiral separator 5 for the third separation. The specific separation process is that the gas phase flows out from the outlet of the spiral separator inlet pipe 51 and enters the spiral channel, and flows spirally in the spiral channel. Under the action of centrifugal force, the liquid drops flow to the inner wall of the cylindrical barrel of the spiral separator, and the gas phase flows to the vertical pipe section of the riser 6. After the gas phase and the liquid phase flow out from the bottom outlet of the spiral channel, the liquid phase enters the first liquid guide pipe 2; the gas phase enters the riser 6 from the inlet at the bottom of the vertical pipe section of the riser 6 and then flows out from the outlet of the riser 6. In the drawings, arrows without reference numerals indicate the flow directions of a gas-liquid two-phase fluid, a liquid phase, or a gas phase, respectively. The gas phase is, for example, a hydrocarbon gas, and the liquid phase is, for example, liquid water, a hydrocarbon oil, an amine liquid, or the like.

The liquid phase in the first liquid guide pipe 2 enters the liquid collecting tank 12 from the outlet of the second liquid guide pipe 8 and flows downwards, and finally enters the lower part of the gas-liquid separator cylinder 10.

In the above operation process, the flow rate of the gas phase entering the bottom of the inner tube 72 is generally 3-15 m/s, and the time for the gas phase to flow through the twisted belt 73 is generally 5-30 s. The flow velocity of the gas phase flowing out from the outlet of the spiral separator inlet pipe 51 is generally 8 to 20 m/s, and the residence time of the gas phase in the spiral channel is generally 10 to 90 seconds.