Gas-liquid separator and taper design method of spiral coil of gas-liquid separator

Abstract

The invention provides a gas-liquid separator and a taper design method of a spiral coil pipe of the gas-liquid separator, the gas-liquid separator comprises a shell and the spiral coil pipe at least partially located in the shell, all spiral rings of the spiral coil pipe are sequentially arranged from top to bottom, the spiral diameters of all the spiral rings of the spiral coil pipe are gradually reduced from top to bottom, and the taper of the spiral coil pipe is designed according to the taper of the spiral coil pipe. A pipe inlet is formed in the upper end of the spiral coil pipe, a pipe outlet is formed in the lower end of the spiral coil pipe, a through hole is formed in the lower position, away from the central axis side of the spiral coil pipe, of the pipe wall of the spiral coil pipe, and during work, gas-liquid two-phase flow is led into the spiral coil pipe from the pipe inlet of the spiral coil pipe. According to the taper design method, the optimal taper of the spiral coil can be determined. The gas-liquid separator is compact in structure and good in gas-liquid separation effect, the pressure drop is within a reasonable range, and the problem that liquid in the shell splashes upwards in some application occasions can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of gas-liquid separation, and in particular to a gas-liquid separator and a taper design method of a spiral coil of the gas-liquid separator. Background Art

[0002] In some applications (such as refrigeration equipment), the space reserved for the gas-liquid separator is very small. Therefore, the compactness of the gas-liquid separator needs to be improved to meet the application requirements.

[0003] How to improve the compactness of the gas-liquid separator while ensuring the gas-liquid separation effect is a technical problem that needs to be solved by technical personnel in this field. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a gas-liquid separator, which includes a shell and a spiral coil, wherein the spiral coil is at least partially located in the shell, and the spiral turns of the spiral coil are arranged in sequence from top to bottom, and the spiral diameter of each spiral turn of the spiral coil gradually decreases from top to bottom, so that the spiral coil is cone-shaped as a whole, and a through hole is provided on the tube wall of the spiral coil away from the lower side of the central axis of the spiral coil, and a tube inlet is provided at the upper end of the spiral coil and a tube outlet is provided at the lower end. When working, a gas-liquid two-phase flow enters the spiral coil from the tube inlet of the spiral coil.

[0005] In addition, the present application also provides a method for designing the taper of a spiral coil of a gas-liquid separator, wherein the gas-liquid separator is the above-mentioned gas-liquid separator, and the method for designing the taper comprises:

[0006] S1. Eliminate the unreasonable range of the taper α of the spiral coil, and then select several angles within a reasonable range as the taper of the spiral coil for model calculation;

[0007] S2. Calculate the equivalent dimensionless centrifugal force a of the spiral coil * , according to the calculated equivalent dimensionless centrifugal force a * Define the first performance parameter A * ;

[0008] S3. Calculate the average distance R between each spiral coil and the inner wall of the shell perpendicular to the central axis of the spiral coil. s , and based on the calculated distance average R s Define the second performance parameter B * ;

[0009] S4. Calculate the equivalent dimensionless friction coefficient f of the spiral coil * ;

[0010] S5. According to the first performance parameter A *, the second performance parameter B * , equivalent dimensionless friction coefficient f * Comprehensively define the comprehensive performance parameter U * , compare the comprehensive performance parameters U corresponding to the tapers of the spiral coil selected in S1 * , and determine the optimal taper of the spiral coil based on the comparison results.

[0011] The gas-liquid separator provided by the present application has a spiral diameter of each spiral turn of the spiral coil that gradually decreases from top to bottom, so a larger space can be formed between the smaller spiral diameter area of ​​the spiral coil and the shell, and other components of the gas-liquid separator can be arranged in the space, thereby improving the compactness of the gas-liquid separator.

[0012] Since the spiral diameter of each spiral turn of the spiral coil gradually decreases from top to bottom, the projection of the spiral coil on a plane perpendicular to the central axis of the spiral coil is approximately a disc-shaped structure. Therefore, when an outlet portion is provided on the upper part of the shell and the outlet portion is connected to the compressor inlet of the refrigeration equipment, when the refrigeration equipment is in the compressor startup stage or the four-way reversing valve reversing stage, the spiral coil can prevent the liquid in the shell from easily splashing upward.

[0013] Since the spiral diameter of each spiral circle of the spiral coil gradually decreases from top to bottom, the whole is conical. Compared with a columnar spiral coil with the same spiral diameter as its maximum spiral diameter, the spiral diameter of the conical spiral coil at other positions except the top end is smaller than the spiral diameter of the columnar spiral coil. Therefore, the centrifugal acceleration of the conical spiral coil at other positions except the top end is greater than the centrifugal acceleration of the columnar spiral coil. Therefore, the gas-liquid separation effect is better than that of the columnar spiral coil with the same spiral diameter as its maximum spiral diameter.

[0014] In short, the gas-liquid separator provided in the present application has a compact structure and good gas-liquid separation effect, and can alleviate the problem of liquid splashing upward in the shell in some application scenarios.

[0015] The design method provided in the present application can determine the optimal taper of the spiral coil, so that the spiral coil has a better gas-liquid separation effect and the pressure drop is within a reasonable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of an embodiment of a gas-liquid separator provided in the present application;

[0017] Figure 2 It is a schematic diagram of a clockwise single-cavity spiral coil;

[0018] Figure 3 It is a schematic diagram of a counterclockwise single-cavity spiral coil;

[0019] Figure 4 A schematic diagram of an embodiment of a two-chamber spiral coil;

[0020] Figure 5 A schematic diagram of another embodiment of a two-chamber spiral coil;

[0021] Figure 6 It is a partial schematic diagram of a circular single tube;

[0022] Figure 7 It is a partial schematic diagram of a flat single tube;

[0023] Figure 8 A local schematic diagram of a circular through hole provided in a tube wall;

[0024] Fig. 9 A local schematic diagram of an elliptical through hole provided in a tube wall;

[0025] Fig.10 It is a partial schematic diagram of the diamond-shaped through hole in the tube wall;

[0026] Fig.11 A local schematic diagram of a tube wall provided with a protrusion and a through hole;

[0027] Fig.12 for Fig.11 Sectional view along the dotted line;

[0028] The following are the descriptions of the reference numerals:

[0029] 100 housing, 101 first outlet, 102 second outlet;

[0030] 200 spiral coil, 201 single tube, 202 tube inlet, 203 tube outlet, 204 through hole, 205 protrusion, 206 communication port, 207 accommodating cavity;

[0031] 300 first manifold, 301 main inlet;

[0032] 400 second manifold, 401 main outlet. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] The present application provides a gas-liquid separator.

[0035] like Figure 1 As shown, the gas-liquid separator provided by the present application includes a shell 100 and a spiral coil 200. The spiral coil is at least partially located in the shell.

[0036] The spiral coil has a plurality of spiral turns, and the spiral turns are arranged in sequence from top to bottom. The spiral diameter of each spiral turn gradually decreases from top to bottom, so that the spiral coil is cone-shaped as a whole. The upper end of the spiral coil is provided with a pipe inlet 202, and the lower end is provided with a pipe outlet 203. The pipe outlet 203 can be located in the housing 100 and communicated with the inner cavity of the housing 100, or it can extend outside the housing 100.

[0037] A through hole 204 is provided at a lower position of the spiral coil away from the central axis of the spiral coil, and multiple through holes are provided in sequence along the length of the tube. The so-called lower position refers to a position below the center line of the spiral coil.

[0038] During operation, the gas-liquid two-phase flow enters the spiral coil from the pipe inlet of the spiral coil, and the gas-liquid two-phase flow moves along the spiral coil. Under the action of gravity and centrifugal force, the liquid-rich phase part will move to the lower position of the spiral coil wall away from the central axis of the spiral coil due to its high density. Since the spiral coil wall is provided with a through hole at the lower position away from the central axis of the spiral coil, the liquid-rich phase part can be discharged from the through hole into the shell. The gas-rich phase part will move to the spiral coil wall close to the central axis of the spiral coil due to its low density, and finally be discharged through the pipe outlet of the spiral coil, thereby achieving the purpose of gas-liquid separation.

[0039] Figure 1 In the embodiment, a first outlet 101 is provided at the lower portion of the shell to allow the liquid in the shell to be discharged.

[0040] Figure 1 In the embodiment, a second outlet 102 is provided at the upper portion of the shell. During operation, part of the gas may escape from the through hole 204 of the spiral coil into the shell. Saturated gas may also escape from the liquid accumulation area in the shell. The gas in the shell can be discharged through the second outlet provided at the upper portion thereof.

[0041] In one application example, the second outlet portion 102 is connected to the compressor inlet of the refrigeration equipment (when the pipe outlet 203 of the spiral coil extends outside the shell 100, the pipe outlet 203 is also connected to the compressor inlet of the refrigeration equipment). In this case, when the refrigeration equipment is in the compressor startup stage or the four-way reversing valve reversing stage, the liquid in the shell is easy to splash upward.

[0042] The gas-liquid separator provided by the present application has a spiral diameter of each spiral turn of the spiral coil that gradually decreases from top to bottom, so a larger space can be formed between the smaller spiral diameter area of ​​the spiral coil and the shell, and other components of the gas-liquid separator can be arranged in the space, thereby improving the compactness of the gas-liquid separator.

[0043] Since the spiral diameter of each spiral turn of the spiral coil gradually decreases from top to bottom, the projection of the spiral coil on a plane perpendicular to the central axis of the spiral coil is approximately a disc-shaped structure. Therefore, when an outlet portion is provided on the upper part of the shell and the outlet portion is connected to the compressor inlet of the refrigeration equipment, when the refrigeration equipment is in the compressor startup stage or the four-way reversing valve reversing stage, the spiral coil can effectively block or alleviate the liquid in the shell from splashing upward.

[0044] Since the spiral diameter of each spiral circle of the spiral coil gradually decreases from top to bottom, the whole is conical. Compared with a columnar spiral coil with the same spiral diameter as its maximum spiral diameter, the spiral diameter of the conical spiral coil at other positions except the top end is smaller than the spiral diameter of the columnar spiral coil. Therefore, the centrifugal acceleration of the conical spiral coil at other positions except the top end is greater than the centrifugal acceleration of the columnar spiral coil. Therefore, the gas-liquid separation effect is better than that of the columnar spiral coil with the same spiral diameter as its maximum spiral diameter.

[0045] In short, the gas-liquid separator has a compact structure and good gas-liquid separation effect, and can alleviate the problem of liquid splashing upwards in the shell in some application occasions.

[0046] In a specific embodiment, the gas-liquid separator includes an inlet pipe and an outlet pipe (not shown in the figure). One end of the inlet pipe is located outside the shell, and the other end extends into the shell to communicate with the pipe inlet of the spiral coil to introduce the gas-liquid two-phase flow into the spiral coil. One end of the outlet pipe is located outside the shell, and the other end extends into the shell to communicate with the pipe outlet of the spiral coil to lead the separated gas phase out of the shell.

[0047] In a specific embodiment, Figure 2 or Figure 3 As shown, the spiral coil is a single-lumen spiral coil with only one spiral lumen. The single-lumen spiral coil is formed by spirally winding a single single tube.

[0048] In a specific embodiment, Figure 4 or Figure 5 As shown, the spiral coil is a multi-lumen spiral coil having multiple (two or more) spiral lumens. Figure 4 and Figure 5The spiral coil shown in is a two-cavity spiral coil. The multi-cavity spiral coil is formed by spirally winding multiple (two or more) single tubes in parallel with each other. Each single tube of the multi-cavity spiral coil is provided with a tube inlet at the upper end and a tube outlet at the lower end. The spiral turns of each single tube of the multi-cavity spiral coil are arranged alternately from top to bottom. For example, the spiral turns of the two single tubes of the two-cavity spiral coil are respectively recorded as A and B, and the spiral turns of the two single tubes are arranged from top to bottom in the form of ABAB... For another example, the spiral turns of the three single tubes of the three-cavity spiral coil are respectively recorded as A, B, and C, and the spiral turns of the three single tubes are arranged from top to bottom in the form of ABCABC...

[0049] In a specific embodiment, Figure 4 or Figure 5 As shown, the pipe inlets of each single pipe of the multi-cavity spiral coil can be combined into a total inlet 301 through a first manifold 300 , and the pipe outlets of each single pipe of the multi-cavity spiral coil can be combined into a total outlet 401 through a second manifold 400 .

[0050] In a specific embodiment, Figure 2 As shown, the spiral coil rotates clockwise when viewed from the upper end (large diameter end).

[0051] In a specific embodiment, Figure 3 As shown, the spiral coil rotates counterclockwise when viewed from the upper end (large diameter end).

[0052] In a specific embodiment, Figure 4 As shown, the projections of the vertical line connecting the tube inlet center of each single tube of the multi-cavity spiral coil and the central axis of the spiral coil (dashed line in the figure) on the plane perpendicular to the central axis of the spiral coil coincide with each other, so that each single tube of the multi-cavity spiral coil starts to spiral downward from roughly the same angular position on the circumference of the central axis of the spiral coil.

[0053] In a specific embodiment, Figure 5 As shown, the projections of the vertical line connecting the tube inlet center of each single tube of the multi-cavity spiral coil and the central axis of the spiral coil (dashed line in the figure) on the plane perpendicular to the central axis of the spiral coil are staggered at a certain angle, so that each single tube of the multi-cavity spiral coil starts to spiral downward roughly from different angular positions on the circumference of the central axis of the spiral coil. Figure 5 The projections of the vertical connection line between the tube inlet centers of the two single tubes of the two-cavity spiral coil and the central axis of the spiral coil on the plane perpendicular to the central axis of the spiral coil are staggered by 180 degrees.

[0054] In a specific embodiment, in the axial direction of the spiral coil, any two adjacent spiral turns of the spiral coil fit together (not shown).

[0055] In a specific embodiment, in the axial direction of the spiral coil, some adjacent spiral turns of the spiral coil are in contact with each other, and some adjacent spiral turns are spaced apart from each other. Figure 4 understand.

[0056] In a specific embodiment, in the axial direction of the spiral coil, any two adjacent spiral turns of the spiral coil are spaced apart from each other, referring to Figure 2 or Figure 3 or Figure 5 It is understood that the separation distances may be the same or different.

[0057] In a specific embodiment, Figure 6 As shown, the single tube of the spiral coil is a circular tube, that is, the radial cross section of the single tube is circular.

[0058] In a specific embodiment, Figure 7 As shown, the single tube of the spiral coil is a flat tube, that is, the radial cross section of the single tube is flat.

[0059] In a specific embodiment, Figure 8 As shown, the maximum dimension of the through hole in the tube length direction (KL in the figure) is equal to the maximum dimension of the through hole in the tube circumferential direction (KZ in the figure).

[0060] In a specific embodiment, Fig. 9 or Fig.10 or Fig.11 As shown, the maximum dimension of the through hole in the tube length direction (KL in the figure) is greater than the maximum dimension of the through hole in the tube circumference direction (KZ in the figure). With this design, the liquid phase is more easily discharged from the through hole, which is beneficial to improving the gas-liquid separation effect, while the gas phase is not easy to escape from the through hole, which is beneficial to reducing the amount of gas phase escape.

[0061] The present application does not limit the shape of the through hole, for example, it can be Figure 8 The circular through hole shown, Fig. 9 The oval through hole shown, Fig.10 The diamond-shaped through holes shown, etc.

[0062] In a specific embodiment, Fig.11 and Fig.12 As shown, the wall of the spiral coil partially protrudes away from the tube cavity to form a protrusion 205, which encloses a receiving cavity 207. The receiving cavity 207 is located on the side of the protrusion close to the tube cavity. A connecting port 206 is provided at the downstream end of the protrusion. The through hole is provided downstream of the protrusion, and the through hole is connected to the receiving cavity through the connecting port. With this design, the liquid phase is more easily discharged from the through hole, which is conducive to improving the gas-liquid separation effect.

[0063] In a specific embodiment, the range of the taper α of the spiral coil is: 25°≤α<2·arctan(D max / (2·H), where D max D is the maximum spiral diameter of the spiral coil, and H is the height of the spiral coil. max and H are determined according to the internal space of the shell. 25°≤α can ensure the compactness of the gas-liquid separator.

[0064] In addition, the present application provides a method for designing the taper of a spiral coil of a gas-liquid separator, by which the optimal taper of the spiral coil can be determined, which can ensure that the gas-liquid separator has a good gas-liquid separation effect and that the pressure drop is within a reasonable range.

[0065] Due to the limitation of external space, the size of gas-liquid separator is usually limited to a certain range. Based on the maximization of space utilization and the maximization of the height of the spiral coil, the following parameters can be obtained: the inner wall diameter D of the shell of the gas-liquid separator, the maximum spiral diameter D of the spiral coil max , the height H of the spiral coil, the length L of the spiral coil, the inner diameter d of the spiral coil i , gas-liquid two-phase flow mass flow rate q, gas-liquid two-phase flow dryness x and saturation temperature T at the inlet of the spiral coil.

[0066] When designing the taper,

[0067] Firstly, the unreasonable range of the taper α of the spiral coil is eliminated, and then several angles are selected within a reasonable range as the taper of the spiral coil for model calculation.

[0068] In a specific embodiment, the reasonable range of the taper α of the spiral coil is: 25°≤α<2·arctan(D max / (2·H), where D max D is the maximum spiral diameter of the spiral coil, and H is the height of the spiral coil. max and H are determined according to the internal space of the shell. 25°≤α can ensure the compactness of the structure of the gas-liquid separator. If the angle is too small, the space inside the shell except for the spiral coil will be too small, which is not conducive to the layout of other components of the gas-liquid separator in the shell.

[0069] In a specific embodiment, an angle is selected at every other gradient within the range of the tapering α of the spiral coil, preferably with equal gradients, for example, 25°, 30°, 35°, 40°, and the gradient is 5°.

[0070] Then, calculate the equivalent dimensionless centrifugal force a of the spiral coil: * , according to the calculated equivalent dimensionless centrifugal force a * Define the first performance parameter A * .

[0071] Since the spiral coil is provided with a through hole 204, the rich liquid phase part will be continuously discharged from the through hole 204 when the gas-liquid two-phase flow moves along the spiral coil, so that the dryness of the medium in the spiral coil gradually increases. The greater the dryness, the better the gas-liquid separation effect. Therefore, the dryness of the medium in the spiral coil can well characterize the gas-liquid separation effect. However, the calculation of the dryness is relatively complicated. This application chooses to calculate the equivalent dimensionless centrifugal force. The calculation of the equivalent dimensionless centrifugal force is relatively simple. The equivalent dimensionless centrifugal force is positively correlated with the dryness of the medium in the spiral coil. Therefore, it can also better characterize the gas-liquid separation effect.

[0072] In a specific embodiment, the calculation process is as follows:

[0073] Calculation of the minimum spiral diameter D of a conical spiral coil min =D max -2·H·tan(α / 2),

[0074] Then the equivalent spiral diameter D of the spiral coil is obtained eq =2 / (1 / D min +1 / D max ),

[0075] Then the equivalent spiral pitch of the spiral coil is obtained

[0076] Then the equivalent number of spiral turns of the spiral coil is obtained, n = H / s, preferably n is not greater than 15, if it is greater than 15, then the calculation is terminated, and n is not greater than 8, which is even better. In addition, if the pitch s is less than the inner diameter d of the spiral coil, i If , the calculation will also be exited.

[0077] Calculate the gas-liquid two-phase flow density: G = 4q / (π·d i 2 )

[0078] Calculate the void fraction of gas-liquid two-phase flow: Where, the gas phase density ρ g , liquid density ρ l , the surface tension σ is obtained by searching based on the saturation temperature T and general physical property software.

[0079] Then the liquid phase velocity is obtained: u l =G(1-x) / (ρ l (1-∈)),

[0080] Then the equivalent dimensionless centrifugal force is obtained: Wherein, k1 is the correction coefficient of centrifugal force, and k1 depends on the specific situation, for example, it can be equal to (1.125-0.065n).

[0081] In a specific embodiment, the first performance parameter A* =a * .

[0082] Due to the equivalent dimensionless centrifugal force a * It is positively correlated with the amount of liquid phase discharged by the spiral coil due to centrifugal action. The dimensionless centrifugal force a * The larger the value, the better the gas-liquid separation effect. Therefore, the first performance parameter A * Can reflect the gas-liquid separation effect.

[0083] Then, calculate the average distance R between each spiral coil and the inner wall of the shell perpendicular to the central axis of the spiral coil. s , and based on the calculated distance average R s Define the second performance parameter B * .

[0084] In a specific embodiment,

[0085] In a specific embodiment, the second performance parameter

[0086] Since the rich liquid phase is discharged into the shell through the through hole of the spiral coil, the gas and liquid will be further separated due to gravity sedimentation and collision with the inner wall of the shell, so the average distance R s The longer it is, the better the gas-liquid separation effect is. Therefore, the second performance parameter B * Can reflect the gas-liquid separation effect.

[0087] Then, the equivalent dimensionless friction coefficient f of the spiral coil is calculated * , f * Positively correlated with the pressure drop of the spiral coil,

[0088] Often, the greater the centrifugal force, the greater the friction coefficient and the greater the system pressure drop. Therefore, the friction coefficient is used as one of the indicators to evaluate whether the taper is reasonable. In this way, the designed taper can ensure that the system pressure drop is within a reasonable range.

[0089] In a specific embodiment, the calculation process is as follows:

[0090] Calculate the homogeneous density:

[0091] Calculate the homogeneous viscosity:

[0092] Calculate the homogeneous phase velocity: u = G / ρ

[0093] Then we get the Reynolds number: Re = ρud i / μ

[0094] Then the equivalent dimensionless friction coefficient is obtained: Where k depends on the specific situation, for example, k can be equal to 0.31. Of course, f * The specific calculation formula is not limited to this, and can be obtained by fitting based on the field test data of the spiral pipeline.

[0095] Then, according to the first performance parameter A * , the second performance parameter B * , equivalent dimensionless friction coefficient f * Comprehensively define the comprehensive performance parameter U * , compare the comprehensive performance parameters U corresponding to the tapers of the spiral coil selected in S1 * , and determine the optimal taper of the spiral coil based on the comparison results.

[0096] The comprehensive performance coefficient U of spiral coil * It not only considers the influence of centrifugal force on the gas-liquid separation ability of the spiral coil, but also considers the influence of gravity sedimentation and collision with the inner wall of the shell after the rich liquid phase is discharged into the shell through the through holes of the spiral coil on the gas-liquid separation ability of the spiral coil, and also takes into account the pipeline pressure drop, so it can characterize the comprehensive performance of the gas-liquid separator.

[0097] In a specific embodiment, a taper of the spiral coil selected in S1 is used as a reference taper, and the first performance parameter A corresponding to the reference taper is * As the first performance parameter benchmark The corresponding second performance parameter B * As a second performance parameter benchmark The corresponding equivalent dimensionless friction coefficient f * As a benchmark for equivalent dimensionless friction coefficient Comprehensive performance parameters in, is the first performance parameter A * The first performance parameter A * The specific gravity coefficient The range of preference

[0098] A calculation example is given below.

[0099] In this calculation example, the inner diameter D of the gas-liquid separator shell is 150 mm, and the maximum spiral diameter D of the spiral coil is max The height H of the spiral coil is 105 mm, the length L of the spiral coil is 800 mm, and the inner diameter d of the spiral coil is i The maximum spiral diameter D is 16 mm, the medium in the spiral coil is R134a, the mass flow rate q is 180 kg / h, the dryness x is 0.5, and the saturation temperature T is 7 °C.max The maximum value of the taper α is calculated by using the height H max =50°, select 25°, 30°, 35°, 40°, and 45° in the range of 25°-50° for model calculation.

[0100] Take 25° as an example:

[0101] Calculation of the minimum spiral diameter D of a conical spiral coil min =D max -2·H·tan(α / 2)=55.34mm, and then the equivalent spiral diameter D of the spiral coil is obtained eq =2 / (1 / D min +1 / D max )=72.48mm, and then the equivalent spiral pitch of the spiral coil is obtained The equivalent number of spiral turns of the spiral coil is n=H / s=3.476.

[0102] Then calculate the gas-liquid two-phase flow density: G = 4q / (π·d i 2 )=248.7kg / m 2 ·s, calculate the void ratio: =0.923, where the gas phase density ρ is obtained by searching the saturation temperature T and combining it with the general physical property software. g =18.319kg / m 3 , liquid density ρ l =1271.3kg / m 3 , surface tension σ=0.010454N / m, and then the liquid phase velocity is obtained: u l =G(1-x) / (ρ l (1-∈))=1.269m / s, and then the equivalent dimensionless centrifugal force is obtained: Then we get A * =a * =4.075.

[0103] Then calculate Then we can conclude

[0104] Then calculate the homogeneous density: Calculate the homogeneous viscosity: Calculate the homogeneous phase velocity: u = G / ρ = 6.88 m / s, and then get the Reynolds number: Re = ρud i / μ=189.2, and then the equivalent dimensionless friction coefficient is obtained: (where k is 0.31).

[0105] Then calculate the comprehensive performance parameters Among them, the A corresponding to 25° * , B * 、f * for The calculated data are shown in the following table. From the table, we can see that the comprehensive performance parameter U corresponding to 35° is * Maximum, so the taper of the spiral coil is determined to be 35°.

[0106]

[0107] The above specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A gas-liquid separator, characterized in that: The gas-liquid separator includes a shell and a spiral coil, wherein the spiral coil is at least partially located in the shell, and the spiral turns of the spiral coil are arranged in sequence from top to bottom, and the spiral diameter of each spiral turn of the spiral coil gradually decreases from top to bottom, so that the spiral coil is cone-shaped as a whole, and a through hole is provided on the tube wall of the spiral coil at a lower position away from the central axis side of the spiral coil, and a tube inlet is provided at the upper end of the spiral coil and a tube outlet is provided at the lower end. When working, a gas-liquid two-phase flow enters the spiral coil from the tube inlet of the spiral coil.

2. The gas-liquid separator according to claim 1, characterized in that: The spiral coil is a multi-cavity spiral coil with multiple spiral cavities. The multi-cavity spiral coil is formed by spirally winding multiple single tubes parallel to each other. The spiral turns of the single tubes of the multi-cavity spiral coil are arranged alternately from top to bottom.

3. The gas-liquid separator according to claim 2, characterized in that: The gas-liquid separator includes a first manifold and a second manifold. A tube inlet is arranged at the upper end and a tube outlet is arranged at the lower end of each single tube of the multi-cavity spiral coil. The tube inlets of each single tube of the multi-cavity spiral coil are combined into a total inlet through the first manifold, and the tube outlets of each single tube of the multi-cavity spiral coil are combined into a total outlet through the second manifold.

4. The gas-liquid separator according to claim 1, characterized in that: The spiral coil is formed by spirally winding a single tube or by spirally winding a plurality of mutually parallel single tubes, and the single tube is a round tube or a flat tube.

5. The gas-liquid separator according to claim 1, characterized in that: The maximum dimension of the through hole in the tube length direction is greater than or equal to the maximum dimension of the through hole in the tube circumferential direction.

6. The gas-liquid separator according to claim 1, characterized in that: The wall of the spiral coil partially protrudes away from the tube cavity to form a protrusion, and the protrusion surrounds a accommodating cavity. The accommodating cavity is located on the side of the protrusion close to the tube cavity. A connecting port is provided at the downstream end of the protrusion, and the through hole is arranged downstream of the protrusion. The through hole is connected to the accommodating cavity through the connecting port.

7. The gas-liquid separator according to any one of claims 1 to 6, characterized in that: The lower part of the shell is provided with a first outlet, and the upper part of the shell is provided with a second outlet.

8. A method for designing the taper of a spiral coil of a gas-liquid separator, characterized in that: The gas-liquid separator is the gas-liquid separator according to any one of claims 1 to 7, and the taper design method comprises: S1. Eliminate the unreasonable range of the taper α of the spiral coil, and then select several angles within a reasonable range as the taper of the spiral coil for model calculation; S2. Calculate the equivalent dimensionless centrifugal force a of the spiral coil * , according to the calculated equivalent dimensionless centrifugal force a * Define the first performance parameter A * ; S3. Calculate the average distance R between each spiral coil and the inner wall of the shell perpendicular to the central axis of the spiral coil. s , and based on the calculated distance average R s Define the second performance parameter B * ; S4. Calculate the equivalent dimensionless friction coefficient f of the spiral coil * ; S5. According to the first performance parameter A * , the second performance parameter B * , equivalent dimensionless friction coefficient f * Comprehensively define the comprehensive performance parameter U * , compare the comprehensive performance parameters U corresponding to the tapers of the spiral coil selected in S1 * , and determine the optimal taper of the spiral coil based on the comparison results.

9. The method for designing the taper of the spiral coil of the gas-liquid separator according to claim 8, characterized in that: In S2, the equivalent dimensionless centrifugal force a * =k1·u l 2 / (g·D eq / 2), the first performance parameter A * =a * ; Wherein, n is the equivalent number of spiral turns of the spiral coil, s is the equivalent helical pitch of the helical coil, H is the height of the spiral coil, D eq is the equivalent spiral diameter D of the spiral coil eq =2 / (1 / D min +1 / D max ), D min is the minimum spiral diameter of the spiral coil, D min =D max -2·H·tan(α / 2), D max is the maximum spiral diameter of the spiral coil, L is the length of the spiral coil, u l is the liquid phase velocity, u l =G(1-x) / (ρ l (1-∈)), G is the gas-liquid two-phase flow density, d i is the inner diameter of the spiral coil, q is the mass flow rate of the gas-liquid two-phase flow, x is the dryness of the gas-liquid two-phase flow at the inlet of the spiral coil, ρ l is the liquid density, ∈ is the void ratio of gas-liquid two-phase flow, ρ g is the gas phase density and σ is the surface tension.

10. The method for designing the taper of the spiral coil of the gas-liquid separator according to any one of claims 8 to 9, characterized in that: A taper of the spiral coil selected in S1 is used as a reference taper, and the first performance parameter A corresponding to the reference taper is * As the first performance parameter benchmark The corresponding second performance parameter B * As a second performance parameter benchmark The corresponding equivalent dimensionless friction coefficient f * As a benchmark for equivalent dimensionless friction coefficient Comprehensive performance parameters in, is the first performance parameter A * The specific gravity coefficient.

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