Integrated three-phase flow generator

Abstract

An integrated three-phase flow generator comprises a water return tank fixedly arranged on a rack, an inner cavity of the water return tank is divided into a water return cavity and a water storage cavity through a partition plate, and the water return cavity and the water storage cavity are not directly communicated in the water return tank; a separation box is connected to the outer wall of the water return box, a separation cavity is formed in the separation box, and the water return cavity and the water storage cavity communicate with the separation cavity; the water pump is connected with the water storage cavity and is connected with the Venturi tube through a liquid phase pipeline, and a servo valve is arranged on the liquid phase pipeline; and the top and the bottom of the separation box are connected to a contraction neck of the Venturi tube through a solid-liquid mixed phase pipeline. The device is an independent system, no external liquid phase converges, the liquid level height of the water return cavity can be controlled by adjusting the liquid level height of the water storage cavity, meanwhile, a conveying pipeline of the separation cavity can be located at the constant liquid level depth, the constant-pressure working environment is maintained, and high-concentration solid-liquid two-phase flow is stably conveyed.

Description

Technical Field

[0001] The present invention relates to the field of multiphase flow formation, and in particular to an integrated three-phase flow generator. Background Art

[0002] A three-phase flow generator is an experimental device used to study the properties of solid, liquid, and gas three-phase flows. Based on the principles of multiphase fluid mechanics, within the reactor, the gas, liquid, and solid phases achieve material transfer and chemical reactions through specific flow patterns and contact mechanisms. This allows the coexistence and interaction of gas, liquid, and solid phases within the same device, thereby simulating and studying complex multiphase flow processes. The working principle of a three-phase flow generator.

[0003] During the development of natural gas hydrates, the solid-liquid-gas three-phase flow within the pipeline transporting the hydrates is constantly changing, severely impacting the pipeline. In experiments exploring the various properties of solid-liquid-gas three-phase flow, high-precision metering equipment has poor tolerance to solid particles, making it difficult to accurately measure the proportions of solid, liquid, and gas phases, and thus, to accurately obtain the three-phase flow required for the experiments. Summary of the Invention

[0004] The present invention is provided to solve the problems raised in the background technology, and the present invention will be further explained below.

[0005] An integrated three-phase flow generator includes a return water tank fixedly arranged on a frame, characterized in that: the inner cavity of the return water tank is divided into a return water chamber and a water storage chamber by a partition, and the return water chamber and the water storage chamber are not directly connected in the return water tank; the outer wall of the return water tank is connected to a separation box, the interior of the separation box is a separation chamber, and the return water chamber and the water storage chamber are both connected to the separation chamber; it also includes a water pump, the water pump is connected to the water storage chamber and connected to the Venturi tube through a liquid phase pipeline, and a servo valve is provided on the liquid phase pipeline; the top and bottom of the separation box are connected to the contraction neck of the Venturi tube through a solid-liquid mixed phase pipeline, and ball valves are provided on both solid-liquid mixed phase pipelines; it also includes a gas mass flow control valve and an air pump, the gas phase is injected into the gas phase pipeline through the air pump, the gas mass flow control valve is provided on the gas phase pipeline, and the gas phase pipeline is mixed with the mixed phase output by the Venturi tube at the second three-way.

[0006] Preferably, the return water tank and the return water chamber and water storage chamber formed therein are axially symmetrical, the separation tank is axially symmetrical, and the axes of symmetry of the return water tank and separation tank coincide. The connection points between the water storage chamber and the separation chamber are symmetrically distributed about the axis of symmetry. This has the effect of forming a stable flow, suppressing the generation of turbulence, and avoiding adverse effects on the subsequent calibration of the solid-liquid ratio at the Venturi tube outlet.

[0007] Preferably, symmetrical diversion plates are arranged in a parallel array across the interior of the separation box to extend the separation time of the solid-liquid mixed phase in the separation box and obtain a better separation effect.

[0008] Preferably, the output of the water pump is further connected to a liquid phase branch parallel to the liquid phase pipeline. The liquid phase branch is also provided with a second ball valve for controlling the liquid phase flow rate and flow rate of the liquid phase branch. Part of the liquid phase flow drawn by the water pump enters the liquid phase pipeline, and the excess flow enters the liquid phase branch.

[0009] Preferably, the output end of the venturi tube is connected to a safety pipeline, which is also provided with a second servo valve. The setting of the second servo valve can prevent the pressure fluctuation of the system from affecting the output target solid-liquid-gas three-phase flow and the safety of the pipeline.

[0010] Preferably, a Y-type filter is provided after the servo valve on the liquid phase pipeline, after the liquid phase branch, and after the gas mass flow control valve on the gas phase pipeline to filter the solid phase entrained in the liquid phase flow.

[0011] Preferably, the safety line is connected to the water storage chamber, and a Y-type filter is provided in front of the second servo valve on the safety line to filter the solid phase entrained in the low-concentration solid-liquid two-phase flow so that the liquid phase flows back into the water storage chamber.

[0012] Beneficial effects: Compared with the prior art, the present invention is an independent system without the influx of external liquid phase. The liquid level height of the return water chamber can be controlled by adjusting the liquid level height of the water storage chamber. At the same time, it can also keep the separation chamber conveying pipeline at a constant liquid level depth, maintain a constant pressure working environment, and stably convey high-concentration solid-liquid two-phase flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : Schematic diagram of the structure of the integrated three-phase flow generator of the utility model.

[0014] Figure 2 : Schematic diagram of the internal structure of the separation box.

[0015] Figure 3 : Schematic diagram of the internal structure of the return water tank.

[0016] In the figure: frame 1, return water tank 2, return water chamber 3, water storage chamber 4, separation box 5, diversion plate 501, water pump 6, venturi tube 7, servo valve 8, ball valve 9, tee 10, second ball valve 11, gas mass flow control valve 12, air pump 13, second tee 14, second servo valve 15, Y-type filter 16. DETAILED DESCRIPTION

[0017] Next, combine the Figure 1-3 A specific embodiment of the present invention is described in detail.

[0018] An integrated three-phase flow generator includes a return water tank 2 fixedly mounted on a frame 1. The inner cavity of the return water tank 2 is divided into a return water chamber 3 and a water storage chamber 4 by a partition. The return water chamber 3 and the water storage chamber 4 are not directly connected within the return water tank 2. A separation box 5 is connected to the outer wall of the return water tank 2. The separation box 5 has a separation chamber inside. The return water chamber 3 and the water storage chamber 4 are both connected to the separation chamber.

[0019] The return water chamber 3 is used to receive incoming materials, which are a mixture of solid, liquid, and gas phases. The gas phase will separate and dissipate due to its own buoyancy. The return water tank then transports the remaining liquid and solid phases to the separation box 5. The liquid and solid mixture entering the separation box 5 will be separated into layers, completing the enrichment of solid particles (solid phase) and increasing the solid phase ratio. It should be noted that the suspension of the solid phase in the liquid phase is determined by its density, and it may be suspended at the top of the separation box 5 or deposited at the bottom of the separation box 5. The separated pure liquid phase is then transported to the water storage chamber 4.

[0020] The return water chamber 3 and the water storage chamber 4 are connected through the separation chamber to form a communicating vessel. According to the communicating vessel principle, the liquid level height of the return water chamber 3 can be controlled by adjusting the liquid level height of the water storage chamber 4. At the same time, the separation chamber conveying pipeline can also be kept at a constant liquid level depth, maintaining a constant pressure working environment and stably conveying high-concentration solid-liquid two-phase flow.

[0021] The return water chamber and the water storage chamber are connected through a separation chamber to form a communicating vessel (containers that are interconnected at the bottom, and after the same liquid is injected, the liquid levels of each container are always maintained at the same level), which follows the basic formula of fluid statics: ; In this experiment, the liquid levels of the return water chamber and the water storage chamber are , then: .

[0022] This experimental equipment is an independent system without external liquid inflow. Therefore, the liquid level of the return water chamber can be controlled by adjusting the liquid level of the water storage chamber. At the same time, it can also keep the separation chamber conveying pipeline at a constant liquid level depth, maintain a constant pressure working environment, and stably convey high-concentration solid-liquid two-phase flow.

[0023] The return water tank 2 and the return water chamber 3 and water storage chamber 4 formed therein are axially symmetrical. The separation box 5 is axially symmetrical, and the symmetry axes of the return water tank 2 and the separation box 5 coincide. The connection between the water storage chamber 4 and the separation chamber is symmetrically distributed about the symmetry axis. The effect is to form a stable fluid, suppress the generation of turbulence, and avoid adverse effects on the subsequent calibration of the solid-liquid ratio at the outlet of the Venturi tube. Preferably, the separation box 5 is provided with symmetrical diversion plates 501 arranged in a parallel array across the interior, which prolongs the separation time of the solid-liquid mixed phase in the separation box 5 and obtains a better separation effect.

[0024] The three-phase flow generating device also includes a water pump 6, which is connected to the water storage chamber 4 and is used to extract the pure liquid phase in the water storage chamber 4 and transport it to the venturi tube 7 through the liquid phase pipeline. A servo valve 8 is provided on the liquid phase pipeline, and the servo valve can adjust and control the flow rate and direction of the liquid phase flow through the sensing element.

[0025] As previously mentioned, due to the different density ratios between the liquid and solid phases within separation box 5, the liquid phase may be suspended at the top or deposited at the bottom of separation box 5. Therefore, both the top and bottom of separation box 5 are connected to the converging neck of the venturi tube 7 via solid-liquid mixed phase pipelines. Specifically, a ball valve 9 is provided on each of the solid-liquid mixed phase pipelines to selectively open one of the two solid-liquid mixed phase pipelines. The two solid-liquid mixed phase pipelines converge at a tee 10 and are connected to the converging neck of the venturi tube 7 via this tee 10.

[0026] The Venturi tube adheres to Bernoulli's principle, maintaining a constant flow rate at varying total heads. Due to the presence of the contraction, the flow velocity at the contraction neck increases, while the static pressure decreases, creating a pressure differential between the Venturi tube 7 and the tee 10. This pressure differential allows the solid-liquid mixture in the solid-liquid mixed phase pipeline to enter the Venturi tube 7 and mix with the liquid phase. Therefore, by measuring the static pressure differential between the inlet and the neck, the corresponding relationship between the solid-liquid ratio at the outlet and the flow rate can be determined.

[0027] The pure liquid phase enters the subsequent pipeline under the action of water pump 6. The output of water pump 6 is also connected to a liquid phase branch line running parallel to the liquid phase pipeline. Part of the liquid phase flow drawn by water pump 6 enters the liquid phase pipeline, while the excess flow enters the liquid phase branch line. The liquid phase branch line is also equipped with a second ball valve 11 to control the liquid phase flow rate and flow rate of the liquid phase in the liquid phase branch line.

[0028] The servo valve 8 and ball valve 9 cooperate with each other to accurately measure the flow rate of the liquid phase pipeline and the solid phase pipeline. The high-concentration solid and liquid phases flow through the venturi tube 7 and mix. According to the Bernoulli principle, the corresponding relationship between the solid-liquid ratio and the flow rate at the venturi tube outlet is measured:

[0029] ;

[0030] Where: : the concentration of the experimental liquid (density of the pure liquid phase in the water storage chamber); : Density of the mixture in the separation box; : The acceleration caused by gravity on a freely falling object; : pressure at the contraction neck of the Venturi tube; : pressure at the nozzle of the venturi tube; : Flow rate at the inlet pipe of the Venturi tube; : The height of the venturi tube axis from the liquid surface; : The height between the water storage chamber and the water pump connecting pipe and the liquid surface; : cross-sectional area of the Venturi tube inlet pipe; : cross-sectional area of the venturi tube’s contraction neck; : Water pump head.

[0031] As can be seen, the interaction between servo valve 8 and ball valve 10 allows for the production of mixed phases with varying solid-liquid ratios at the output of the venturi tube 7. The three-phase flow generator also includes a gas mass flow control valve 12 and an air pump 13. Gas is injected into the gas phase pipeline via the air pump 13. The gas mass flow control valve 12 is positioned within the gas phase pipeline to precisely control the gas flow rate. The mixed phases from the gas phase pipeline and the output of the venturi tube 7 are combined at the second T-junction 14, ultimately delivering the desired solid-liquid-gas three-phase flow.

[0032] The output end of the venturi tube 7 is connected to a safety pipeline, which is also provided with a second servo valve 15. The setting of the second servo valve can prevent the pressure fluctuation of the system from affecting the output target solid-liquid-gas three-phase flow and the safety of the pipeline.

[0033] Preferably, a Y-type filter 16 is provided after the servo valve 8 on the liquid phase pipeline (based on the flow direction of the phase in the pipe), on the liquid phase branch, and after the gas mass flow control valve 12 on the gas phase pipeline to filter the solid phase entrained in the liquid phase flow, thereby ensuring the safety of the measuring instrument. The measuring instruments involved in this embodiment are all conventional instruments and are not elaborated in detail in this embodiment.

[0034] Based on the three-phase flow generating device of the present invention, the target flow of solid-liquid-gas three-phase flow can be obtained, and the specific steps are as follows:

[0035] S1, calibrate the relationship between the solid-liquid ratio and flow rate at the outlet of the Venturi tube;

[0036] S2, the future material is injected into the return water tank, the gas phase will dissipate, and the remaining liquid phase and solid phase will be transported to the separation tank;

[0037] S3, the liquid phase and solid phase in the separation box are separated, and the separated pure liquid phase is transported to the water storage chamber. The low-concentration solid-liquid two-phase flow passes through the separation box to obtain the liquid phase and the enriched high-concentration solid-liquid two-phase flow;

[0038] S4, start the water pump, and the high-concentration solid-liquid two-phase flow mixes with the liquid phase in the venturi tube to become a low-concentration solid-liquid two-phase flow;

[0039] In S5, the gas phase passes through the air pump and the gas mass flow control valve and mixes with the low-concentration solid-liquid two-phase flow to form a solid-liquid-gas three-phase flow.

[0040] The safety pipeline is connected to the water storage chamber 4, and is intended to return the low-concentration solid-liquid two-phase flow output by the venturi tube 7 to the water storage chamber 4. A Y-type filter 16 is provided in front of the second servo valve 15 on the safety pipeline to filter the solid phase entrained in the low-concentration solid-liquid two-phase flow, so that the liquid phase flows back into the water storage chamber 4.

[0041] The integrated three-phase flow generator of the present invention is an independent system that can control the liquid level of the return water chamber by adjusting the liquid level of the water storage chamber, so that the separation chamber conveying pipeline is at a constant liquid level depth, maintains a constant pressure working environment, and stably conveys high-concentration solid-liquid two-phase flow. The integrated three-phase flow generator of the present invention also has the advantages of wide application, high precision, easy maintenance, and strong scalability. It can generate solid-liquid-gas three-phase flow in any proportion and is used to simulate a variety of actual working conditions. It has a wide range of applications: the so-called high precision feature is manifested in being insensitive to solid particles, so that the measuring instrument can accurately measure the required parameters, greatly improving the accuracy of the proportion of each phase of the solid-liquid-gas three-phase flow; the so-called easy maintenance feature is that the entire system is mostly a static device, which is easy to maintain; the so-called strong scalability feature is that each component is connected by a union, which is highly detachable and can be flexibly changed according to the needs of the experiment, and has strong scalability.

[0042] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An integrated three-phase flow generator, comprising a return water tank (2) fixedly mounted on a frame (1), characterized in that: The inner cavity of the return water tank (2) is divided into a return water cavity (3) and a water storage cavity (4) by a partition, and the return water cavity (3) and the water storage cavity (4) are not directly connected in the return water tank (2); the outer wall of the return water tank (2) is connected to a separation box (5), the interior of the separation box (5) is a separation cavity, and the return water cavity (3) and the water storage cavity (4) are both connected to the separation cavity; the return water tank (2) also includes a water pump (6), which is connected to the water storage cavity (4) and connected to the venturi tube (7) through a liquid phase pipeline, and the liquid phase pipeline is provided with a Servo valve (8); the top and bottom of the separation box (5) are connected to the contraction neck of the venturi tube (7) through solid-liquid mixed phase pipelines, and ball valves (9) are provided on both solid-liquid mixed phase pipelines; it also includes a gas mass flow control valve (12) and an air pump (13), the gas phase is injected into the gas phase pipeline through the air pump (13), the gas mass flow control valve (12) is provided on the gas phase pipeline, and the gas phase pipeline and the mixed phase output from the venturi tube (7) are mixed at the second three-way (14).

2. The integrated three-phase flow generator according to claim 1, characterized in that: The return water tank (2) and the return water chamber (3) and the water storage chamber (4) formed therein are axially symmetrical, the separation tank (5) is axially symmetrical, and the symmetry axes of the return water tank (2) and the separation tank (5) coincide, and the connection point between the water storage chamber (4) and the separation chamber is symmetrically distributed about the symmetry axis.

3. The integrated three-phase flow generator according to claim 2, characterized in that: Symmetrical diversion plates (501) are arranged in a parallel array across the interior of the separation box (5).

4. The integrated three-phase flow generator according to claim 1, characterized in that: The output of the water pump (6) is also connected to a liquid phase branch line parallel to the liquid phase pipeline, and a second ball valve (11) is provided on the liquid phase branch line for controlling the liquid phase flow rate and flow rate of the liquid phase branch line.

5. The integrated three-phase flow generator according to claim 4, characterized in that: The output end of the venturi tube (7) is connected to a safety pipeline, and a second servo valve (15) is also provided on the safety pipeline.

6. The integrated three-phase flow generator according to claim 5, characterized in that: Y-type filters (16) are provided after the servo valve (8) on the liquid phase pipeline, after the gas mass flow control valve (12) on the liquid phase branch, and on the gas phase pipeline.

7. The integrated three-phase flow generator according to claim 6, characterized in that: The safety pipeline is connected to the water storage chamber (4), and a Y-type filter (16) is provided in front of the second servo valve (15) on the safety pipeline.

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