Multi-layer gas-liquid mixer and use method

Abstract

The invention belongs to the technical field of multi-layer gas-liquid mixers, and discloses a multi-layer gas-liquid mixer and a use method.The multi-layer gas-liquid mixer comprises a gas phase inlet, a liquid phase inlet, a gas-liquid two-phase mixing section, a liquid phase splitter plate fixing plate, a gas-liquid mixing cavity, a gas-liquid mixing cavity outlet partition plate and a gas-liquid mixture outlet, and the liquid phase inlet, the gas-liquid two-phase mixing section, the liquid phase splitter plate fixing plate, the gas-liquid mixing cavity outlet partition plate and the gas-liquid mixture outlet are sequentially arranged; the gas-phase inlet is used for inputting a gas-phase medium into the gas-liquid two-phase mixing section, the gas-liquid two-phase mixing section comprises a cavity and a plurality of mixing units, and the plurality of mixing units are arranged in the cavity to form a channel for mixing the gas-phase medium and a liquid-phase medium; a plurality of holes are formed in the liquid phase splitter plate fixing plate and the gas-liquid mixing cavity outlet partition plate. The multi-phase mixed transportation flow pattern can be effectively changed and adjusted, the mixing area is large, the mixing uniformity is high, the efficiency is high, the adaptive flow pattern range is wide, and safety and reliability are achieved.

Description

Technical Field

[0001] This invention belongs to the technical field of multi-layer gas-liquid mixers, specifically relating to a multi-layer gas-liquid mixer and its usage method. Background Technology

[0002] Currently, multiphase mixing technology is widely used in oilfields and the pump industry both domestically and internationally, demonstrating good economic efficiency. However, in oilfields, the coexistence of oil and natural gas is common. The gas-liquid two-phase flow at the inlet of the mixing pump exhibits complex and variable flow patterns, with drastic changes in the gas phase volume fraction. This results in poor mixing of the gas and liquid phases, easily leading to blockages and other adverse operating conditions, severely impacting the pump's internal and external characteristics and operational stability. Therefore, it is essential to design a specialized, high-efficiency gas-liquid mixer to improve the flow pattern of the medium at the mixing pump inlet, promote the mass transfer efficiency of the gas-liquid two-phase flow, improve the operating conditions of the mixing pump, and ensure optimal unit efficiency and operational reliability. For the complex transportation requirements of high-viscosity, high-gas-content multiphase flows, the technology for high-efficiency gas-liquid homogenization devices still needs further improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-layer gas-liquid mixer and its usage method, which can achieve uniform gas-liquid inflow at the inlet of the mixing pump, improve the flow pattern, increase the stability of gas-liquid two-phase flow mixing and conveying, avoid blockage of the mixing pump and other adverse operating conditions, and improve the performance of the device.

[0004] The technical solution adopted in this invention is a multi-layer gas-liquid mixer, including a gas phase inlet and a liquid phase inlet, a gas-liquid two-phase mixing section, a liquid phase diverter plate fixing plate, a gas-liquid mixing chamber, a gas-liquid mixing chamber outlet baffle, and a gas-liquid mixture outlet arranged sequentially. The gas phase inlet is used to input a gas phase medium into the gas-liquid two-phase mixing section. The gas-liquid two-phase mixing section includes a cavity and several mixing units. The several mixing units are arranged in the cavity to form a channel for mixing the gas phase medium and the liquid phase medium. Several holes are provided on both the liquid phase diverter plate fixing plate and the gas-liquid mixing chamber outlet baffle.

[0005] Optionally, the mixing unit is a flow divider, with several flow dividers coaxially sleeved from the inside to the outside. The gas-liquid two-phase mixing section further includes a gas phase pressure stabilizing chamber, a gas phase pipeline, and a gas phase pressure stabilizing chamber shell. The gas phase pressure stabilizing chamber shell is sleeved on the cavity body to form the gas phase pressure stabilizing chamber. The gas phase inlet is located on the gas phase pressure stabilizing chamber shell and communicates with the gas phase pressure stabilizing chamber. The gas phase pressure stabilizing chamber is also communicated with one end of the gas phase pipeline, and the other end of the gas phase pipeline is communicated with several flow dividers. Several flow dividers are also communicated with the liquid phase inlet.

[0006] Furthermore, the gas phase pipeline is cross-shaped, and the four ends of the cross-shaped gas phase pipeline are connected to the interior of the gas phase pressure stabilizing cavity. Several gas phase outlets are provided on the side wall of the cross-shaped gas phase pipeline, and the several gas phase outlets are respectively located in several of the branch pipes.

[0007] Furthermore, a gas phase diversion orifice plate is provided at the end of the gas phase outlet, and a plurality of gas phase diversion orifices are provided on the gas phase diversion orifice plate.

[0008] Optionally, the mixing unit is a helical blade, with several helical blades horizontally arranged in the cavity, and the rotation directions of two adjacent helical blades being opposite.

[0009] Optionally, the mixing unit is a wave plate, with several wave plates stacked in the cavity and adjacent wave plates staggered.

[0010] Preferably, the liquid phase flow divider plate fixing plate has a plurality of gas-liquid mixing holes arranged in a plurality of concentric rings, and except for the innermost ring, the diameter of the gas-liquid mixing holes gradually increases from the inner ring to the outer ring.

[0011] Preferably, the gas-liquid mixing chamber is a straight pipe, and the gas-liquid mixing chamber has the same inner diameter as the cavity body and is concentrically arranged.

[0012] Preferably, the gas-liquid mixture outlet and the liquid phase inlet have a funnel-shaped structure.

[0013] The present invention also provides a method using a multi-layer gas-liquid mixer, comprising the following steps: S1, liquid and gaseous inflows enter the gas-liquid two-phase mixing section; S2. In the gas-liquid two-phase mixing section, gas phase bubbles aggregate and break up, the bubble diameter gradually decreases, the bubble dispersion increases, and the gas phase distribution gradually becomes more uniform, thus achieving initial mixing. S3. After initial mixing, the mixed phase flows through the liquid phase splitter plate fixing plate 17 and enters the gas-liquid mixing chamber 5. When the mixed phase passes through the hole of the liquid phase splitter plate fixing plate 17, the gas phase bubbles will break into smaller diameter bubbles, and the gas and liquid phases will be more evenly distributed, achieving pressure balance and buffering. S4. The mixed phase enters the inlet pipe of the pump evenly through the hole on the outlet baffle 19 of the gas-liquid mixing chamber.

[0014] The beneficial effects of this invention are as follows: This invention enables uniform inflow of gas-liquid two-phase flow into the inlet of a mixed-flow pump in the field of multiphase flow transportation, improves the flow pattern, promotes the mass transfer efficiency of gas-liquid two-phase flow, avoids blockage flow and other adverse operating conditions in the mixed-flow pump, and increases the stability of gas-liquid two-phase flow mixing and transportation; it can also achieve integrated buffering and uniform mixing, with a compact and reasonable structure, large mixing area, high mixing uniformity, high efficiency, wide adaptability to flow patterns, improved device performance, and safety and reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the multi-layer gas-liquid mixer of the present invention.

[0016] Figure 2 This is a cross-sectional view of the gas phase outlet.

[0017] Figure 3 for Figure 1 Cross-sectional view at point AA.

[0018] Figure 4 for Figure 1 Cross-sectional view at point BB.

[0019] Figure 5 for Figure 1 Cross-sectional view at point C.

[0020] Figure 6 This is a schematic diagram of the helical blade structure in Example 4.

[0021] Figure 7 This is a schematic diagram of the wave plate structure in Example 5.

[0022] In the diagram: 1. Liquid phase inlet; 2. Rib plate; 3. Gas phase pressure stabilizing chamber; 4. Gas phase inlet; 5. Gas-liquid mixing chamber; 6. Gas-liquid mixture outlet; 7. Gas phase outlet; 8. Gas phase diversion orifice; 9. Gas phase diversion orifice plate; 10. First layer liquid phase diversion pipe; 11. Second layer liquid phase diversion pipe; 12. Third layer liquid phase diversion pipe; 13. Fourth layer liquid phase diversion pipe; 14. Gas phase pipeline; 15. Gas phase pressure stabilizing chamber shell; 16. Chamber body; 17. Liquid phase diversion plate fixing plate; 18. Gas-liquid homogenizing orifice; 19. Gas-liquid mixing chamber outlet baffle; 20. Gas-liquid mixing chamber outlet; 22. Spiral blade; 23. Corrugated plate. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 like Figure 1As shown, the multi-layer gas-liquid mixer of the present invention includes a gas phase inlet 4 and a liquid phase inlet 1, a gas-liquid two-phase mixing section, a liquid phase diverter plate fixing plate 17, a gas-liquid mixing chamber 5, a gas-liquid mixing chamber outlet baffle 19, and a gas-liquid mixture outlet 6 arranged sequentially. The gas phase inlet 4 is used to input a gas phase medium into the gas-liquid two-phase mixing section. The gas-liquid two-phase mixing section includes a cavity 16 and a plurality of mixing units. The plurality of mixing units are arranged in the cavity 16 to form a channel for mixing the gas phase medium and the liquid phase medium. The liquid phase diverter plate fixing plate 17 and the gas-liquid mixing chamber outlet baffle 19 are both provided with a plurality of holes.

[0025] This invention enables uniform inflow of gas-liquid two-phase flow into the inlet of a mixed-flow pump in the field of multiphase flow transportation, improves the flow pattern, promotes the mass transfer efficiency of gas-liquid two-phase flow, avoids blockage flow and other adverse operating conditions in the mixed-flow pump, and increases the stability of gas-liquid two-phase flow mixing and transportation; it can also achieve integrated buffering and uniform mixing, with a compact and reasonable structure, large mixing area, high mixing uniformity, wide adaptability to flow patterns, improved device performance, and safety and reliability.

[0026] Example 2 Based on Example 1, in this example, the liquid inlet 1 is a funnel-shaped structure with its cross-sectional area gradually increasing from the end away from the gas-liquid two-phase mixing section to the end closer to the gas-liquid two-phase mixing section. Through the gradually expanding tube form of the funnel-shaped structure, the liquid flow rate can be effectively reduced and the flow state can be stabilized.

[0027] The mixing unit is a split pipe, with several split pipes coaxially nested from the inside to the outside.

[0028] The gas-liquid two-phase mixing section also includes a gas phase pressure stabilizing chamber 3, a gas phase pipeline 14, and a gas phase pressure stabilizing chamber shell 15. The gas phase pressure stabilizing chamber shell 15 is fitted onto the cavity 16 to form the gas phase pressure stabilizing chamber 3. The gas phase inlet 4 is disposed on the gas phase pressure stabilizing chamber shell 15 and is connected to the gas phase pressure stabilizing chamber 3. The gas phase pressure stabilizing chamber 3 is also connected to one end of the gas phase pipeline 14. The other end of the gas phase pipeline 14 is connected to several of the branch pipes. The several branch pipes are also connected to the liquid phase inlet 1.

[0029] The gas inlet 4 is located on the outer wall of the gas phase stabilizing chamber shell 15 and is perpendicular to the axis of the splitter pipe. The area enclosed by the gas phase stabilizing chamber shell 15 is the gas phase stabilizing chamber 3. An opening is provided at the connection between the gas phase stabilizing chamber shell 15 and the gas phase inlet 4, through which the gas phase inlet 4 communicates with the interior of the gas phase stabilizing chamber 3. The vertical inlet allows the gas to be more evenly distributed to all parts of the mixer, avoiding flow deviation or concentration, and reducing the degree of turbulence within the gas phase stabilizing chamber 3.

[0030] like Figure 1 and Figure 3As shown, the gas phase pipeline 14 is cross-shaped, with its four ends connected to the interior of the gas phase pressure stabilizing chamber 3. Several gas phase outlets 7 are provided on the sidewall of the cross-shaped gas phase pipeline 14, and these outlets 7 are connected to the flow divider chamber. In this embodiment, 16 gas phase outlets 7 are evenly distributed on the cross-shaped gas phase pipeline 14, and 4 gas phase outlets 7 are provided on each flow divider chamber.

[0031] like Figure 2 As shown, in some specific embodiments, a gas phase distribution plate 9 is also provided at the end of the gas phase outlet 7, and a plurality of gas phase distribution holes 8 are provided on the gas phase distribution plate 9. The gas phase distribution holes 8 can uniformly distribute the gas phase medium into each distribution layer cavity, and mix it more thoroughly with the liquid phase medium in the distribution layer cavity, resulting in a more uniform distribution of the gas and liquid phases.

[0032] Example 3 Based on Example 1 or Example 2, such as Figure 3 As shown, the diversion tube includes a first liquid phase diversion tube 10, a second liquid phase diversion tube 11, a third liquid phase diversion tube 12, and a fourth liquid phase diversion tube 13. The first liquid phase diversion tube 10, the second liquid phase diversion tube 11, the third liquid phase diversion tube 12, and the fourth liquid phase diversion tube 13 are nested together from the inside out and are arranged concentrically.

[0033] The gas phase enters uniformly from the gas phase outlet 7 through the gas phase stabilizing chamber 3, the gas phase pipeline 14, the first layer diversion pipe 10, the second layer diversion pipe 11, the third layer diversion pipe 12, and the fourth layer diversion pipe 13, achieving initial gas-liquid mixing. Layered mixing increases the mixing area. During the initial mixing process, bubbles continuously coalesce and break up, the bubble diameter gradually decreases, the dispersion is high, and the gas phase distribution gradually becomes more uniform.

[0034] like Figure 4 As shown, the liquid phase splitter plate fixing plate 17 has several gas-liquid mixing holes 18 arranged in several concentric rings. The positions of the ring-shaped gas-liquid mixing holes 18 correspond to the positions of the splitter chambers. Except for the innermost ring of gas-liquid mixing holes 18, the diameter of the gas-liquid mixing holes 18 gradually increases from the inner ring to the outer ring. The larger outer ring diameter helps to improve the gas-liquid mixing efficiency, while the smaller inner ring diameter can prevent small bubbles from merging into large bubbles. Therefore, the varying hole diameter on the liquid phase splitter plate fixing plate 17 helps to maintain a better gas-liquid dispersion state.

[0035] like Figure 5 As shown, a plurality of gas-liquid mixing chamber outlets 20 are provided on the gas-liquid mixing chamber outlet partition 19, and the plurality of gas-liquid mixing chamber outlets 20 are evenly distributed.

[0036] The gas-liquid mixing chamber 5 is a straight pipe with the same diameter and concentricity as the outermost diversion layer chamber. The gas and liquid phases are fully mixed in the gas-liquid mixing chamber 5 to achieve buffering and homogenization of the gas and liquid phases.

[0037] The outlet 6 of the gas-liquid mixture has a funnel-shaped structure. Its cross-sectional area gradually increases from the end away from the gas-liquid mixing chamber 5 to the end closer to the gas-liquid mixing chamber 5. Through the gradually narrowing tube form of the funnel-shaped structure, the inlet velocity of the mixing pump is increased, ensuring uniform inflow of the medium.

[0038] The implementation steps of this invention are as follows: 1. Input of liquid and gas phases: The liquid phase flows into the mixer from the liquid phase inlet 1, and enters the concentric circular tube flow layer cavity formed by the liquid phase first layer flow layer 10, the liquid phase second layer flow layer 11, the liquid phase third layer flow layer 12, and the liquid phase fourth layer flow layer 13 through the liquid phase diffuser. At the same time, the gas phase flows into the gas phase pressure stabilizing cavity 3 from the gas phase inlet 4, so as to reduce the pressure fluctuation of the gas phase medium and reduce the mixing disturbance, and then enters each flow layer cavity evenly and stably through the gas phase pipeline 14.

[0039] 2. Initial Mixing of Liquid and Gas Phases: Before mixing, the gas and liquid phases have unequal velocities. After initial mixing in each flow chamber, their velocities gradually become equal. The gas phase gradually accelerates under the drag force of the liquid phase, while the corresponding liquid phase velocity gradually decreases. Multi-layer homogenization increases the gas-liquid mixing area. During the initial mixing process, gas bubbles coalesce and break up, the bubble diameter gradually decreases, and the bubble dispersion increases, resulting in a gradually more uniform gas phase distribution. The homogenization process of gas bubbles in the liquid phase is what achieves initial mixing.

[0040] 3. Mixing: After initial mixing, the gas and liquid phases flow through the gas-liquid homogenization holes 18 into the gas-liquid mixing chamber 5. The gas-liquid homogenization holes 18 are holes evenly distributed on the surface of the liquid phase distribution plate fixed plate 17. After passing through the gas-liquid homogenization holes 18, the gas phase bubbles will break into smaller diameter bubbles, resulting in a more uniform distribution of the gas and liquid phases. The gas-liquid mixing chamber 5 is a straight pipe of equal diameter, where the mixed phases are further mixed to achieve pressure balance and buffering. The mixing disturbance gradually decreases, the flow is stable, and only slippage exists between the fluids, resulting in low turbulence intensity and a more uniform bubble distribution.

[0041] 4. Output of the gas-liquid mixture: The final mixed phase, after passing through the gas-liquid mixing chamber 5 and the gas-liquid mixing chamber outlet 20, enters the pre-pump inlet pipe (i.e., the mixed phase outlet converging pipe) in the same direction. After accelerating, it then enters the pump inlet pipe evenly through the gas-liquid mixture outlet 6. The gas-liquid mixing chamber outlet 20 has uniformly distributed small holes of equal diameter on the surface of the gas-liquid mixing chamber outlet baffle 19. The opening direction of the small holes is centered to avoid the rotation of the mixed phase flow, improve the flow pattern, and enhance the performance of the device.

[0042] Example 4 Based on Example 1, such as Figure 6As shown, the mixing unit is a helical blade 22, and several helical blades 22 are horizontally arranged in the cavity 16, with adjacent helical blades 22 rotating in opposite directions.

[0043] In this embodiment, the gas phase inlet 4 is disposed on the liquid phase inlet 1, and the gas phase medium enters through the gas phase inlet 4.

[0044] In some feasible embodiments, the gaseous medium and the liquid medium are mixed and then introduced together through the liquid inlet 1.

[0045] Under the influence of its own kinetic energy, the medium enters the spiral blade 22, where it is forced to undergo cutting, twisting, separation, and mixing. As the medium flows through a twisting blade, it is divided into two parts, flowing in from both sides of the blade. While moving forward, the medium is forced to rotate along the twisting blade. Its axis of rotation is the center of the pipe. In addition, the medium itself rotates, that is, it rotates in a ring around the hydraulic center of the semi-circular cross-section, enhancing the radial mixing effect of the mixing pipe.

[0046] Example 5 Based on Example 1, such as Figure 7 As shown, the mixing unit of this invention is a corrugated plate 23, with several corrugated plates 23 stacked within the cavity 16, and adjacent corrugated plates 23 staggered. It functions to cut and disperse the medium. The corrugated plates 23 cut the medium into many tiny droplets, which flow along the grooves of the corrugated plates 23 repeatedly to achieve dispersion and mixing. The staggered planes of adjacent corrugated plates 23 cause the flow plane of the medium to change during flow, forming a three-dimensional spatial flow, thus enabling better mixing of the medium.

[0047] Example 6 Based on Example 1, the present invention also provides a method using a multi-layer gas-liquid mixer, comprising the following steps: S1, the liquid phase flow and the gas phase flow enter the gas-liquid two-phase mixing section.

[0048] S2. In the gas-liquid two-phase mixing section, gas phase bubbles aggregate and break up, the bubble diameter gradually decreases, the bubble dispersion increases, and the gas phase distribution gradually becomes more uniform, thus achieving initial mixing.

[0049] S3. After initial mixing, the mixed phase flows through the liquid phase splitter plate fixing plate 17 and enters the gas-liquid mixing chamber 5. When the mixed phase passes through the hole of the liquid phase splitter plate fixing plate 17, the gas phase bubbles will break into smaller diameter bubbles, and the gas and liquid phases will be more evenly distributed, achieving pressure balance and buffering.

[0050] S4. The mixed phase enters the inlet pipe of the pump evenly through the hole on the outlet baffle 19 of the gas-liquid mixing chamber.

[0051] Components and structures not described in detail in the embodiments are well-known components, common structures or common means in the industry, and will not be described in detail here.

Claims

1. A multi-layer gas-liquid mixer, characterized in that, It includes a gas phase inlet (4) and a liquid phase inlet (1), a gas-liquid two-phase mixing section, a liquid phase flow divider plate fixing plate (17), a gas-liquid mixing chamber (5), a gas-liquid mixing chamber outlet baffle (19), and a gas-liquid mixture outlet (6) arranged in sequence; the gas phase inlet (4) is used to input gas phase medium into the gas-liquid two-phase mixing section, the gas-liquid two-phase mixing section includes a cavity (16) and several mixing units, the several mixing units are arranged in the cavity (16) to form a channel for mixing gas phase medium and liquid phase medium; the liquid phase flow divider plate fixing plate (17) and the gas-liquid mixing chamber outlet baffle (19) are both provided with several holes.

2. The multi-layer gas-liquid mixer according to claim 1, characterized in that, The mixing unit is a split pipe, and several split pipes are coaxially sleeved from the inside to the outside. The gas-liquid two-phase mixing section also includes a gas phase stabilizing chamber (3), a gas phase pipeline (14), and a gas phase stabilizing chamber shell (15). The gas phase stabilizing chamber shell (15) is sleeved on the cavity (16) and forms a gas phase stabilizing chamber (3). The gas phase inlet (4) is set on the gas phase stabilizing chamber shell (15). The gas phase inlet (4) is connected to the gas phase stabilizing chamber (3). The gas phase stabilizing chamber (3) is also connected to one end of the gas phase pipeline (14). The other end of the gas phase pipeline (14) is connected to several split pipes. Several split pipes are also connected to the liquid phase inlet (1).

3. The multi-layer gas-liquid mixer according to claim 2, characterized in that, The gas phase pipeline (14) is cross-shaped. The four ends of the cross-shaped gas phase pipeline (14) are connected to the interior of the gas phase pressure stabilizing chamber (3). Several gas phase outlets (7) are provided on the side wall of the cross-shaped gas phase pipeline (14). The several gas phase outlets (7) are respectively located in several of the diversion pipes.

4. The multi-layer gas-liquid mixer according to claim 3, characterized in that, The gas phase outlet (7) is also provided with a gas phase diversion plate (9), and the gas phase diversion plate (9) is provided with a plurality of gas phase diversion holes (8).

5. The multi-layer gas-liquid mixer according to claim 1, characterized in that, The mixing unit is a helical blade (22), and several helical blades (22) are horizontally arranged in the cavity (16), with the rotation directions of two adjacent helical blades (22) being opposite.

6. The multi-layer gas-liquid mixer according to claim 1, characterized in that, The mixing unit is a wave plate (23), and several wave plates (23) are stacked in the cavity (16), with adjacent wave plates (23) staggered.

7. The multi-layer gas-liquid mixer according to claim 1, characterized in that, The liquid phase flow divider plate fixing plate (17) has a number of gas-liquid mixing holes (18), which are arranged in a number of concentric rings. Except for the innermost ring, the diameter of the gas-liquid mixing holes (18) gradually increases from the inner ring to the outer ring.

8. The multi-layer gas-liquid mixer according to claim 1, characterized in that, The gas-liquid mixing chamber (5) is a straight pipe, and the inner diameter of the gas-liquid mixing chamber (5) is the same as that of the cavity (16) and they are concentrically arranged.

9. The multi-layer gas-liquid mixer according to claim 1, characterized in that, The gas-liquid mixture outlet (6) and the liquid phase inlet (1) are funnel-shaped structures.

10. A method using the multi-layer gas-liquid mixer as described in claim 1, characterized in that, Includes the following steps: S1, liquid and gaseous inflows enter the gas-liquid two-phase mixing section; S2. In the gas-liquid two-phase mixing section, gas phase bubbles aggregate and break up, the bubble diameter gradually decreases, the bubble dispersion increases, and the gas phase distribution gradually becomes more uniform, thus achieving initial mixing. S3. After initial mixing, the mixed phase flows through the liquid phase splitter plate fixing plate 17 and enters the gas-liquid mixing chamber 5. When the mixed phase passes through the hole of the liquid phase splitter plate fixing plate 17, the gas phase bubbles will break into smaller diameter bubbles, and the gas and liquid phases will be more evenly distributed, achieving pressure balance and buffering. S4. The mixed phase enters the inlet pipe of the pump evenly through the hole on the outlet baffle 19 of the gas-liquid mixing chamber.

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