Vertical natural gas precise separation cyclone separator

Abstract

The utility model discloses a vertical type natural gas accurate separation cyclone separator, which relates to the field of natural gas treatment equipment, and comprises a separator shell, a separation component is arranged in the separator shell, and the separator shell is divided into two cavities, namely a natural gas outflow cavity and a liquid phase cavity from top to bottom by the separation component; the upper part of the natural gas outflow cavity is connected with a natural gas discharge port, and the lower part of the liquid phase cavity is connected with a liquid phase discharge port; an inlet pipe is arranged on the separator shell, and the separation assembly is connected with the inlet pipe; and a liquid level stabilizer is arranged in the liquid phase cavity. According to the utility model, the defects of the conventional centrifugal separator can be overcome, so that the liquid phase and the natural gas can be efficiently and accurately separated under the condition of not increasing too much investment, and the flow load fluctuation resistance of the conventional centrifugal separator is improved.

Description

Technical Field

[0001] The utility model relates to the field of natural gas processing equipment, in particular to a vertical natural gas precise separation cyclone separator. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] In the development and production process of oil and gas fields, liquid phase and natural gas (liquid phase, i.e. condensate oil, natural gas condensate, produced gas, etc.; natural gas, mainly refers to natural gas, flash steam and condensate gas) separator is a common and indispensable separation equipment, the main function of which is to separate the liquid phase and natural gas mixture for a series of subsequent treatments. According to different separation principles, oil and gas separators in oil fields and gas fields mostly adopt two forms: gravity separator and centrifugal separator. Among them, gravity separator is widely used, using the density difference between the separated liquid phase and natural gas to achieve separation under the action of gravity. Its advantages are simple structure, low manufacturing difficulty, stable operation, low resistance, and disadvantages are large equipment specifications, high manufacturing cost, large floor space, etc. Centrifugal separators also use the density difference between liquid phase and natural gas, and need a certain flow rate to achieve the purpose of liquid phase and natural gas separation under the dual action of centrifugal force and gravity. At present, most centrifugal separators adopt a vertical empty cylinder structure without internal separation elements. Compared with gravity separators, the advantages of centrifugal separators are that the equipment volume is smaller than that of gravity separators, the land occupation is small, and the investment is low. The main disadvantages are low separation efficiency and poor resistance to flow fluctuations. In particular, when the processing volume exceeds the designed flow rate, the separation efficiency drops sharply. At present, most centrifugal separators use an empty cylinder structure without separation elements. The separation process of the liquid phase and natural gas is as follows:

[0004] The gas-liquid mixture passes through the inlet pipe of the centrifugal separator and enters the inside of the centrifugal separator horizontally or obliquely downward in the tangent direction of the inner wall of the centrifugal separator. Under the dual effects of centrifugal force and gravity, the mixture of liquid phase and natural gas flows downward along the inner wall of the centrifugal separator in a spiral rotation. The liquid phase with higher density flows downward in a spiral rotation close to the inner wall of the centrifugal separator, and finally falls into the liquid phase space at the bottom of the centrifugal separator and is discharged from the liquid phase outlet at the bottom of the centrifugal separator; while the natural gas, due to its relatively small density, flows upward in a spiral rotation in the vertical center part of the centrifugal separator and is finally discharged from the natural gas outlet at the top of the centrifugal separator.

[0005] It can be seen that there are two spiral rotating flows inside the centrifugal separator: one is the liquid flow spirally rotating downward on the inner wall of the separator, and the other is the natural gas flow spirally rotating upward in the vertical center of the separator. Since most centrifugal separators currently use an internal hollow cylinder structure, there are mainly the following shortcomings or disadvantages in actual use:

[0006] (1) There is no clear gas-liquid interface, resulting in the mixing of liquid and natural gas, unclear interface, and low separation efficiency;

[0007] From the above-mentioned separation process of the liquid phase and the natural gas mixture in the centrifugal separator, it can be known that during the rotational separation process of the gas-liquid mixture inside the centrifugal separator, the liquid phase and the natural gas are always in continuous contact. Due to the lack of appropriate physical isolation and appropriate restraint facilities, especially in the initial stage when the liquid phase and the natural gas mixture enter the centrifugal separator, the oil and gas mixture is not fully separated, and part of the liquid droplets will be carried away by the upward flowing natural gas, resulting in low separation efficiency.

[0008] (2) The separation time of the liquid phase and natural gas mixture by centrifugal force is short, resulting in low separation efficiency;

[0009] Since the current centrifugal separator is an internal hollow cylinder structure without effective separation elements, after the liquid phase and natural gas mixture enters the centrifugal separator, it takes less than 1 second and less than 360° to reach the liquid phase space at the bottom of the centrifuge, according to simulation analysis and calculation. The separation time using centrifugal force is short, and the gas-liquid mixture falls into the liquid phase space at the bottom of the centrifuge without being fully separated. The liquid phase here still contains a lot of natural gas and is discharged from the centrifuge, resulting in low separation efficiency of the centrifuge.

[0010] (3) The reverse flow inside the centrifuge reduces the separation efficiency;

[0011] From the previous introduction, we know that there are two flows inside the centrifugal separator: the upward natural gas flow and the downward liquid flow. It is because of these two flows that two adverse effects are caused.

[0012] One disadvantageous effect: The high-speed rotating upward natural gas flow will form a tornado-like low pressure, carrying the droplets in the bottom liquid phase space upward and out of the centrifugal separator, resulting in reduced separation efficiency. This is especially likely to happen when the flow rate of the inlet liquid phase and natural gas mixture fluctuates greatly.

[0013] Another adverse effect: Due to the current rotating flow in the centrifugal separator, the liquid level of the liquid phase space at the bottom of the centrifugal separator is not a relatively stable horizontal liquid level, but a rotating liquid level with an inverted cone. The distance between the center of the inverted cone rotating liquid level and the bottom of the centrifugal separator becomes smaller, which makes the vertical height of the gas-liquid mixture in the liquid phase space at the bottom of the centrifugal separator insufficient for gravity separation again, and the liquid phase carries out the natural gas that should be separated by gravity in time, resulting in low separation efficiency. Also, due to the lack of a stable and sufficient liquid seal height, natural gas may also be carried out from the outlet liquid phase.

[0014] (4) The hollow cylinder structure of the current centrifugal separator results in the separator's poor ability to resist the flow load fluctuation of the liquid phase and natural gas mixture;

[0015] Due to the relatively small volume of the current centrifugal separator and its hollow cylinder structure, there are two spiral rotating flows, one upward and one downward, inside, and an inverted cone-shaped liquid interface at the bottom of the centrifugal separator. Although the current centrifugal separator is equipped with a relatively complete liquid level control system, etc., once the flow rate of the gas-liquid mixture changes, the centrifugal separator will still be difficult to adapt to. It is very likely that natural gas will carry liquid, and liquid will carry natural gas. This also leads to the poor ability of the current centrifugal separator to resist the flow load fluctuation of the gas-liquid mixture. Utility Model Content

[0016] The purpose of the utility model is to provide a vertical natural gas precision separation cyclone separator in view of the problems existing in the above-mentioned prior art, which can improve the shortcomings of the current centrifugal separator, so as to achieve efficient and precise separation of natural gas without increasing too much investment, and improve the ability of the current centrifugal separator to resist flow load fluctuations.

[0017] The technical solution of the utility model is as follows:

[0018] A vertical natural gas precision separation cyclone separator comprises: a separator shell, a separation component is arranged in the separator shell, the separation component divides the separator shell into two cavities from top to bottom, namely: a natural gas outflow chamber and a liquid phase chamber; a natural gas discharge port is connected to the top of the natural gas outflow chamber, and a liquid phase discharge port is connected to the bottom of the liquid phase chamber; an inlet pipe is arranged on the separator shell, and the separation component is connected to the inlet pipe; a liquid level stabilizer is arranged in the liquid phase chamber.

[0019] Furthermore, the separation assembly comprises: an outer cylinder, a middle cylinder and an inner cylinder;

[0020] The outer cylinder is in close contact with the inner wall of the separator housing, the middle cylinder is in close contact with the inner wall of the outer cylinder, and an outer cylinder sealing plate is arranged above the middle cylinder and the outer cylinder;

[0021] The inner cylinder is arranged inside the middle cylinder and located above the middle cylinder, dividing the inner space of the middle cylinder into a feed rectifying cavity and a gas-liquid flow channel; a spiral plate is arranged on the outer wall of the inner cylinder.

[0022] Furthermore, the inner cylinder comprises: a first inner cylinder and a second inner cylinder, the first inner cylinder is arranged above the second inner cylinder, and overflow channels for natural gas flow are arranged in the first inner cylinder and the second inner cylinder; the first inner cylinder passes through the outer cylinder sealing plate and extends to the natural gas outflow chamber; a spiral plate is arranged on the outer wall of the second inner cylinder.

[0023] Furthermore, the outer wall of the first inner cylinder, the upper part of the second inner cylinder, the inner wall of the outer cylinder sealing plate and the inner wall of the middle cylinder together form a feed rectification chamber.

[0024] Furthermore, the outer wall of the second inner tube and the inner wall of the middle tube form a gas-liquid flow channel.

[0025] Furthermore, the inlet pipe passes through the outer cylinder and the middle cylinder and is connected with the feed rectifying cavity.

[0026] Furthermore, the first inner tube and the second inner tube are hollow inside; both ends of the first inner tube are open; the lower end of the second inner tube is open, and the upper end is open at the connection with the first inner tube to form an overflow channel.

[0027] Furthermore, a support plate is provided at the lower end of the second inner cylinder.

[0028] Furthermore, the number of turns of the spiral plate is 1.5 turns.

[0029] Furthermore, the liquid level stabilizer is a cylindrical liquid level stabilizer inverted in the liquid phase cavity.

[0030] Compared with the existing technology, the beneficial effects of the utility model are:

[0031] 1. A vertical natural gas precision separation cyclone separator, comprising: a separator shell, a separation assembly arranged in the separator shell, the separation assembly divides the separator shell into two chambers from top to bottom, namely: a natural gas outflow chamber and a liquid phase chamber; a natural gas discharge port is connected to the upper part of the natural gas outflow chamber, and a liquid phase discharge port is connected to the lower part of the liquid phase chamber; an inlet pipe is arranged on the separator shell, and the separation assembly is connected to the inlet pipe; a liquid level stabilizer is arranged in the liquid phase chamber; the shortcomings of the current centrifugal separator can be improved, so as to achieve efficient and precise separation of gas and natural gas without increasing too much investment, and improve the ability of the current centrifugal separator to resist flow load fluctuations.

[0032] 2. A vertical natural gas precision separation cyclone separator, which straightens and stabilizes the flow field of the natural gas mixture coming from the inlet pipe by adding a feed straightening chamber.

[0033] 3. A vertical natural gas precision separation cyclone separator, which prolongs the contact and separation time of the oil-gas mixture and stabilizes the internal cyclone flow field state by increasing the gas-liquid flow channel.

[0034] 4. A vertical natural gas precision separation cyclone separator, by adding a liquid level stabilizer to stabilize the liquid phase interface so as to better utilize gravity for re-separation and provide better liquid seal and other effective measures, can achieve efficient and precise separation of oil and gas mixture with less investment and smaller floor space, and also greatly improve the load fluctuation resistance of the cyclone separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a vertical natural gas precise separation cyclone separator;

[0036] Figure 2 It is a schematic diagram of the structure of the separation component.

[0037] Figure markings: 1-leg bracket, 2-hemispherical head, 3-separator shell, 4-liquid level stabilizer, 5-separation assembly, 6-outer cylinder, 7-middle cylinder, 8-first inner cylinder, 9-second inner cylinder, 10-spiral plate, 11-support plate, 12-outer cylinder sealing plate, 13-overflow channel, 14-feed rectifying chamber, 15-gas-liquid flow channel, 16-natural gas outflow chamber, 17-liquid phase chamber, 18-natural gas discharge outlet, 19-liquid phase discharge outlet, 20-inlet pipe. DETAILED DESCRIPTION

[0038] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0040] Embodiment 1

[0041] See also Figure 1 , a vertical natural gas precise separation cyclone separator, which can efficiently and precisely separate the mixture with natural gas, specifically includes the following structure:

[0042] A separator housing 3, wherein a separation assembly 5 is disposed in the separator housing 3, wherein the separation assembly 5 divides the separator housing 3 into two chambers, namely: a natural gas outflow chamber 16 and a liquid phase chamber 17; a natural gas discharge port 18 is connected to the upper portion of the natural gas outflow chamber 16, and a liquid phase discharge port 19 is connected to the lower portion of the liquid phase chamber 17; an inlet pipe 20 is disposed on the separator housing 3, and the separation assembly 5 is connected to the inlet pipe 20; a liquid level stabilizer 4 is disposed in the liquid phase chamber 17;

[0043] Preferably, the liquid level stabilizer 4 is a cylindrical liquid level stabilizer that is inverted in the liquid phase cavity 17. Therefore, since the liquid phase cavity 17 is provided with an inverted cylindrical liquid level stabilizer, the liquid phase cavity 17 is no longer like the inverted cone liquid surface of the current centrifugal separator, but forms a stable horizontal liquid surface, which is then discharged through the liquid phase discharge port 19 at the bottom of the cyclone separator after gravity separation.

[0044] In this embodiment, please refer to Figure 2 The separation assembly 5 comprises: an outer cylinder 6, a middle cylinder 7 and an inner cylinder;

[0045] The outer cylinder 6 is in close contact with the inner wall of the separator housing 3, the middle cylinder 7 is in close contact with the inner wall of the outer cylinder 6, and a sealing plate of the outer cylinder 6 is arranged above the middle cylinder 7 and the outer cylinder 6;

[0046] The inner cylinder is arranged inside the middle cylinder 7 and is located above the middle cylinder 7, dividing the inner space of the middle cylinder 7 into a feed rectifying chamber 14 and a gas-liquid flow channel 15; a spiral plate 10 is arranged on the outer wall of the inner cylinder.

[0047] In this embodiment, specifically, the inner cylinder includes: a first inner cylinder 8 and a second inner cylinder 9, the first inner cylinder 8 is arranged above the second inner cylinder 9, and an overflow channel 13 for the flow of natural gas is arranged in the first inner cylinder 8 and the second inner cylinder 9; the first inner cylinder 8 passes through the sealing plate of the outer cylinder 6 and extends to the natural gas outflow chamber 16; a spiral plate 10 is arranged on the outer wall of the second inner cylinder 9.

[0048] In this embodiment, specifically, the outer wall of the first inner cylinder 8 , the upper portion of the second inner cylinder 9 , the inner wall of the sealing plate of the outer cylinder 6 and the inner wall of the middle cylinder 7 together form a feed rectifying chamber 14 .

[0049] In this embodiment, specifically, the outer wall of the second inner cylinder 9 and the inner wall of the middle cylinder 7 form a gas-liquid flow channel 15 .

[0050] In this embodiment, specifically, the inlet pipe 20 passes through the outer cylinder 6 and the middle cylinder 7 and is connected with the feed rectifying chamber 14 .

[0051] In this embodiment, specifically, the first inner tube 8 and the second inner tube 9 are hollow inside; both ends of the first inner tube 8 are open; the lower end of the second inner tube 9 is open, and the upper end is open at the connection with the first inner tube 8 to form an overflow channel 13.

[0052] In this embodiment, specifically, a support plate 11 is provided at the lower end of the second inner tube 9 .

[0053] In this embodiment, specifically, the number of turns of the spiral plate 10 is 1.5 turns.

[0054] The method of using the vertical natural gas precise separation cyclone separator proposed in this embodiment is as follows:

[0055] The mixture of the gas and natural gas enters the feed rectifying chamber 14 at the upper part of the cyclone separator in a horizontal direction of the tangent line of the outer cylinder 6 of the cyclone separator through the inlet pipe 20;

[0056] The oil-gas mixture flows in a horizontal annular circumferential flow in the feed rectifying cavity 14. Under the action of centrifugal force and gravity, the oil-gas mixture enters the gas-liquid flow channel 15. The gas with higher density is thrown to the inner wall of the middle cylinder 7 and flows spirally downward, and rotates along the inner wall of the middle cylinder 7 to flow into the liquid phase cavity 17 at the bottom; the natural gas flows out of the gas-liquid flow channel 15, rotates upward through the overflow channel 13 and flows out to the natural gas outflow cavity 16, and is discharged through the natural gas outlet 18;

[0057] The inner wall of the middle cylinder 7 rotates to reach the liquid phase chamber 17 at the bottom. Since an inverted cylindrical liquid level stabilizer is provided in the liquid phase chamber 17, the liquid phase chamber 17 is no longer like the inverted cone liquid surface of the current centrifugal separator, but forms a stable horizontal liquid surface, which is then discharged through the liquid phase outlet 19 at the bottom of the cyclone separator after gravity separation.

[0058] Embodiment 2

[0059] A vertical natural gas precise separation cyclone separator further comprises: a hemispherical seal head 2, and the upper and lower parts of the separator housing 3 are sealed by the hemispherical seal head 2.

[0060] Embodiment 3

[0061] A vertical natural gas precise separation cyclone separator further comprises: a leg bracket 1, wherein the leg bracket 1 is connected to a separator housing 3, and the separator housing 3 is supported by the leg bracket 1.

[0062] Embodiment 4

[0063] This embodiment is based on a specific application of the above-mentioned vertical natural gas precise separation cyclone separator.

[0064] Specifically, the separator shell diameter is 400mm, the height between the hemispherical heads is 1000mm, and the natural gas processing capacity can reach 10~60×10 4 m 3 / d (adapt to small flow, upper limit of processing volume or higher);

[0065] Specifically, the separator shell diameter is 600mm, the height between the hemispherical heads is 1600mm, and the processing capacity can reach 20 to 100×10 4 m 3 / d (adapt to larger processing volume, the upper limit of processing volume or higher).

[0066] Under the condition of the same processing capacity, achieving efficient and accurate separation of liquid and natural gas and improving the ability to resist flow fluctuation, the height of the cyclone separator is much smaller than that of the existing centrifugal separator (the height between the heads can be reduced by more than 50%), and the diameter is also relatively much smaller, which greatly reduces the equipment investment and land occupation.

[0067] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0068] This background technology section is provided to generally present the context of the present invention, and the work of the currently named inventors, the work to the extent described in this background technology section, and aspects of this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art of the present invention.

Claims

1. A vertical natural gas precise separation cyclone separator, characterized in that: include: A separator shell (3), wherein a separation assembly (5) is arranged inside the separator shell (3), wherein the separation assembly (5) divides the separator shell (3) into two chambers, namely: a natural gas outflow chamber (16) and a liquid phase chamber (17); the natural gas outflow chamber (16) is connected to a natural gas discharge port (18) above, and the liquid phase chamber (17) is connected to a liquid phase discharge port (19) below; an inlet pipe (20) is arranged on the separator shell (3), and the separation assembly (5) is connected to the inlet pipe (20); and a liquid level stabilizer (4) is arranged in the liquid phase chamber (17).

2. A vertical natural gas precise separation cyclone separator according to claim 1, characterized in that: The separation assembly (5) comprises: an outer cylinder (6), a middle cylinder (7) and an inner cylinder; The outer cylinder (6) is in close contact with the inner wall of the separator housing (3), the middle cylinder (7) is in close contact with the inner wall of the outer cylinder (6), and an outer cylinder (6) sealing plate is provided above the middle cylinder (7) and the outer cylinder (6); The inner cylinder is arranged inside the middle cylinder (7) and is located above the middle cylinder (7), dividing the internal space of the middle cylinder (7) into a feed rectifying chamber (14) and a gas-liquid flow channel (15); a spiral plate (10) is arranged on the outer wall of the inner cylinder.

3. A vertical natural gas precise separation cyclone separator according to claim 2, characterized in that: The inner cylinder comprises: a first inner cylinder (8) and a second inner cylinder (9); the first inner cylinder (8) is arranged above the second inner cylinder (9); an overflow channel (13) for the flow of natural gas is arranged in the first inner cylinder (8) and the second inner cylinder (9); the first inner cylinder (8) passes through the sealing plate of the outer cylinder (6) and extends to the natural gas outflow chamber (16); and a spiral plate (10) is arranged on the outer wall of the second inner cylinder (9).

4. A vertical natural gas precise separation cyclone separator according to claim 3, characterized in that: The outer wall of the first inner cylinder (8), the upper portion of the second inner cylinder (9), the inner wall of the sealing plate of the outer cylinder (6) and the inner wall of the middle cylinder (7) together form a feed rectifying chamber (14).

5. The vertical natural gas precise separation cyclone separator according to claim 3, characterized in that: The outer wall of the second inner cylinder (9) and the inner wall of the middle cylinder (7) form a gas-liquid flow channel (15).

6. A vertical natural gas precise separation cyclone separator according to claim 3, characterized in that: The inlet pipe (20) passes through the outer cylinder (6) and the middle cylinder (7) and is connected to the feed rectifying chamber (14).

7. A vertical natural gas precise separation cyclone separator according to claim 3, characterized in that: The first inner tube (8) and the second inner tube (9) are hollow inside; the first inner tube (8) is open at both ends; the second inner tube (9) is open at the lower end and open at the upper end where it is connected to the first inner tube (8), forming an overflow channel (13).

8. A vertical natural gas precise separation cyclone separator according to claim 7, characterized in that: A support plate (11) is provided at the lower end of the second inner tube (9).

9. The vertical natural gas precise separation cyclone separator according to claim 3, characterized in that: The number of turns of the spiral plate (10) is 1.5 turns.

10. The vertical natural gas precise separation cyclone separator according to claim 1, characterized in that: The liquid level stabilizer (4) is a cylindrical liquid level stabilizer which is inverted in the liquid phase cavity (17).

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